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Meet the Experts

Get up to speed on DME's introduction as a fuel directly from those most involved with the strategic and technical aspects of its commercialization in North America and elsewhere - recent features include insights from a heavy-duty diesel engine OEM, refiner, technology provider, and well-known R&D center.

 

DME Production

Ron Sills
Co-Founding Director
XTL & DME Institute

“A key advantage facilitating the commercialization of DME as a clean alternative fuel is that it can be easily made from methanol, an established major global commodity that can be produced from multiple primary energy sources – natural gas, coal and biomass.

Another potential supply-side advantage is that DME is a chemical intermediate and integral production step in current commercial processes to make gasoline from methanol (e.g. methanol-to-gasoline / MTG). Understanding DME’s relationship to these methanol conversion processes and the dynamic nature of the current market for them is an important step to understanding the potential business cases for supplying DME.

Ron Sills
Co-Founding Director
XTL & DME Institute

Dr. Sills is an internationally recognized expert on the value chains for methanol and its derivatives, particularly those involving DME and methanol-to-gasoline (MTG). At BP in the 2000s, he was a member of BP’s India DME Project team. In the 1980s and 1990s he held various R&D positions at Mobil, including Manager, Research Planning, and had hands-on experience in the production of DME from methanol as principle investigator for Mobil’s four barrel per day methanol-to-gasoline demonstration plant. He has been actively involved with the International DME Association since its inception, and is an honorary member of the organization.

Below Ron provides insight into the potential commercial options for supplying DME to growing markets, particularly in light of the concurrent commercialization of MTG technology.

 

Question: How are methanol conversion processes – some of them decades old – relevant to DME and the energy market today?

First let’s talk about the global market. Methanol conversion processes to make light olefins (ethylene and propylene) and gasoline, as well as DME, are providing new business opportunities globally to expand the methanol market at a greater rate than the traditional chemical markets (e.g. formaldehyde and acetic acid). Methanex states that the growth rate from energy (including methanol blending) and olefin applications is increasing at a rate of 12% vs 8% for the combined energy / olefins and traditional markets. Most of this growth is in China. Technology providers for producing olefins from methanol include UOP Honeywell, Air Liquide as well as a number of Chinese companies. Current major technology providers offering a process to produce gasoline from methanol are ExxonMobil and Haldor Topsoe.

Turning now to North America: commercial developments are primarily being driven by the ample supplies of low-cost natural gas due to the shale gas revolution creating a revival of the methanol industry in the United States. This revival is supporting developments to make gasoline from natural gas-derived methanol. Licensees of ExxonMobil’s MTG technology include G2X Energy (multi-license gas-to-gasoline agreement); ZeoGas LLC (Gulf Coast USA, gas-to-gasoline, 16,000 BPD); and Sundrop Fuel (Louisiana, 3,500 BPD GTL / BTL). Primus Green Energy has developed technology to convert synthesis gas via methanol / DME to gasoline. And Haldor Topsoe has a proprietary MTG technology.

Question: Regarding the MTG process, why not stop at DME, rather than continue on to produce gasoline?

It’s all about the markets and current MTG design and experience. While it is true that DME is an intermediate in the reaction pathways to produce gasoline from methanol, the huge global market for gasoline remains attractive, while a large-scale market for DME as a diesel substitute must first be developed. Furthermore, in the current MTG design – proven commercially in New Zealand and China, and now licensed by ExxonMobil – DME production is an integral first step in the overall process scheme. Although technically feasible, decoupling DME production from the next step which converts the DME and unconverted methanol to gasoline would likely require a pilot plant / demonstration plant operation before a commercial project would be considered.

Question: As the market for DME as a diesel substitute grows in North America, how can the increasing demand be supplied?

Since DME 1) can be produced from multiple feedstocks, 2) using technology offered by numerous suppliers, 3) is easily transported long distances, and 4) can be supplied by many companies with different business models and strategies, several supply scenarios will likely evolve.

One supply scenario is that offered by Oberon Fuels; that is, building small-scale, modular DME facilities, making DME from purchased methanol or producing methanol from various methane-containing feedstocks.

Another scenario is for methanol to be transported from large-scale methanol plants located near natural gas resources / pipelines, to DME facilities located near the DME markets. The transport distances can vary between hundreds to thousands of miles. An example of this was the Methanex joint venture with XinAo supplying methanol via ship to their 200,000 MTPA DME plant in China.

Another scenario is for DME plants to be built adjacent to large-scale methanol plants. An example of this is the methanol (1 million MTPA) and DME (20,000 MTPA) production complex being built in Trinidad and Tobago by a consortium including technology provider Mitsubishi Gas Chemical.

As the DME market grows and MTG plants are build in North America, gasoline and DME could be co-produced from an integrated facility that includes a large-scale methanol plant(s) supplying methanol to onsite MTG and DME plants. The capacity of the initial DME plant, for example, could be 100,000 MTPA, with the facility expanded to match anticipated market demand growth. These plants could also supply methanol to the merchant market.

Question: Since DME, gasoline, and methanol can be co-produced from the same facility how will stakeholders decide which downstream product option is best for their needs?

Stakeholders planning to build methanol and methanol conversion plants will decide which products to produce primarily based on strategic, market and economic analyses. Although on paper there is appears to be inherent flexibility, in reality plant designs are typically based on running all units at full production capacity to be as economic as possible. Otherwise underutilized capacity is wasted CAPEX. Multi-product plants will likely consist of a large methanol plant with distillation; an MTG plant converting a portion of the methanol to gasoline; and a DME plant converting another portion of the methanol to DME. As current commercially-proven MTG designs use integrated DME / gasoline production units, it seems unlikely that the methanol would be converted to DME and then some of the raw DME distilled for the DME market while the rest was converted to gasoline.

However, once a co-production plant is built and the capital invested, if the market / economics changes, then companies will base product options on maximizing cash flow, as happened with the gas-to-gasoline plant built in New Zealand in 1985, which was converted to a methanol-only facility in the late 1990s.

 

"Because DME does not form soot, there is the potential of meeting strict tailpipe emissions regulations without requiring a diesel particulate filter in the exhaust system. This aspect of DME can lead to simplified vehicle powertrain systems and the reduction of engine and emissions systems control challenges that strict emissions regulations create."

André Boehman
Professor of Mechanical Engineering
University of Michigan

André Boehman is a Professor of Mechanical Engineering at the University of Michigan, pursuing research at the W. E. Lay Auto Lab, primarily on alternative fuels, combustion and pollution control. He is a Fellow of the Society of Automotive Engineers, and leads the International DME Association’s Research & Development Committee.

In this edition of the feature Prof. Boehman provides insight into the practical benefits of DME’s use as an automotive fuel, research being done around the world on DME applications, and how challenges inherent to DME’s fuel use, such as lubricity, are being addressed.

 

Question: From the perspective of a diesel engine, what is DME’s appeal?

DME’s great appeal is based on two fundamental properties. First and foremost in terms of diesel engine operation the appeal is that DME has excellent combustion behaviour. DME has a high cetane number (i.e. excellent ignition quality relative to conventional diesel fuels) and DME burns without forming soot because it contains no carbon-carbon (C-C) bonds. Because DME has a high cetane number, it can be an effective diesel fuel replacement in conventional and many advanced combustion processes.

The second reason for the great appeal is that because DME burns without forming soot, one can aggressively try to reduce other pollutants through measures within the engine combustion chamber (e.g., use large amounts of exhaust gas recirculation to reduce nitrogen oxides emissions) without paying a penalty on soot emissions. Thus DME provides flexibility in engine pollutant control within the engine. Furthermore, because DME does not form soot, there is the potential of meeting strict tailpipe emissions regulations without requiring a diesel particulate filter in the exhaust system. This aspect of DME can lead to simplified vehicle powertrain systems and the reduction of engine and emissions systems control challenges that strict emissions regulations create.

Question: Is DME combustion literally sootless?

Yes, it burns without forming soot under the range of conditions that we have studied, including combustion in both engines and flames (e.g. burners such as those used in stoves).

The building blocks for forming soot are aromatics (compounds like benzene, C6H6) which can lead directly to formation of the larger aromatic structures that eventually become soot particles. In a fuel without aromatics, such as natural gas or propane, the key to forming soot is to create fragments of the fuel that will form into aromatics. This tends to mean forming acetylene (C2H2) and other fragments (called radicals) that will combine to form aromatics. DME lacks any direct bonding of its two carbon atoms. The carbons in DME are bound to an oxygen (this is the definition of the class of compounds called ethers), not to each other, making it far more difficult to grow acetylene or aromatics to build soot during combustion.

Question: The energy density of DME is lower than that of diesel. What are the ramifications of this in the context of a heavy-duty vehicle, the fuel tank capacity, and range?

Because DME has less energy than diesel fuel on a mass basis and on a volume basis, larger fuel tanks are required to achieve the same range. The Volvo heavy-duty trucks running on DME used for the demonstration project in Sweden have a range of 800 km (480 mile) – reasonable for a heavy-duty truck. While the challenge would be to make space for the extra tank volume, because a DME truck may not need a particulate filter a large volume of space on the vehicle can be gained back and devoted to accommodate larger fuel tanks.

Question: What are the automotive applications for DME?

DME is best suited for use in pure form (“neat”) as a replacement diesel fuel in diesel (compression ignition) engines. In my own early work (1997 – 2003) with DME in diesel engines we blended DME with diesel fuel because we did not have access to a fuel injection system designed for operation on neat DME. Because DME has a very low viscosity and no natural lubricity (fuels actually help to lubricate the moving parts in fuel injection systems), one must design the fuel injection system to tolerate these fuel properties and one must include a lubricity additive to protect the fuel injector and fuel pump. When DME is blended with diesel fuel, the diesel fuel will provide the lubricity needed and will increase the viscosity relative to neat DME. But to keep the DME in solution with the diesel fuel, the fuel supply system must be pressurized to 75 psi. This adds complexity to the engine and vehicle system. We blended DME into diesel fuel at up to 30% by volume DME in diesel fuel, and the engine operated well. However, the engine required a pressurized fuel supply and delivery system in place of the conventional diesel fuel tank, and the benefits on engine emissions were nowhere near as good as moving from diesel fuel to neat DME.

One can blend DME with propane at concentrations up to 20% by volume DME in propane, and still have a good fuel for spark ignition engines. This could be a path to bringing a biofuel into propane autogas by adding renewable content. Propane is an excellent automotive fuel, but it is difficult to find opportunities to combine a biofuel with propane. One can blend propane into DME at concentrations up to 20% by volume propane in DME and still have a good fuel for diesel (compression ignition) engines. This could help to create a market for propane in the diesel vehicle fleet, where to date there has only been a modest application through “dual fuel” diesel + propane engine conversions. Overall, the most effective pathway for use of DME is for compression ignition engines as a neat fuel.

Question: What technical obstacles remain related to DME’s use as a transportation fuel?

The “chicken and egg” logistical challenges faced by many alternative fuels (which means to say that it is hard to justify building up a fuel production and distribution infrastructure without vehicles in place that can use the fuel, and it is hard to justify engineering and producing vehicles that would operate on a dedicated alternative fuel without have the fuel production and supply infrastructure in place) have been circumvented by the development of fleet scale DME production technology by IDA member Oberon Fuels and heavy-duty DME trucks by IDA member the Volvo Group. The parallel development of these two technologies will permit the roll out of fleets of DME trucks with dedicated fuel production that is matched in scale with the vehicle fleet.

On the technical side, issues that are being addressed include durability and fuel supply systems. While DME burns extremely well in a compression ignition engine, engineering the fuel injection and fuel supply systems to have the same durability as conventional diesel fuel injection and supply systems is an area of focus. Low lubricity and low viscosity combine to make it challenging to design a fuel injection system with the long term durability expected by heavy-duty truck owners and operators. With the move towards the commercial production of DME heavy-duty trucks in North America now underway, these issues will be resolved.

Practical challenges on which members of the IDA are also actively working are the development of codes, standards and compliance testing methodologies. Just as with jet fuels, diesel fuels, gasolines and the major biofuels (ethanol and biodiesel), quality control and fuel specification regimens are required to verify the quality and composition of the DME used as a transportation fuel. This is typically handled by industry standards such as the American Society for Testing and Materials (ASTM), and members of the IDA are working closely with ASTM subcommittees to develop this regimen.

Question: How is low lubricity addressed in diesel applications?

Lubricity additives are commonly used with low lubricity fuels. When the U.S. and much of the world transitioned to ultra-low sulphur fuels, conventional diesel fuels began to demonstrate problems derived from reduced lubricity. With additives, lubricity can be increased to prevent the kind of scuffing wear associated with low lubricity fuels.

An additional challenge is that because DME burns without forming soot, it is important that the lubricity additive does not contribute to the formation of soot either. That creates a set of design criteria to guide the further development of lubricity agents for DME such as the need to provide a significant increase in lubricity at low treat rates (the dose or concentration of an additive used) of ~ 100 – 1000 ppm, and the need to burn cleanly.

Question: What are the IDA R&D Committee’s priorities, and how does it operate?

The mission of the IDA’s R&D Committee is to bring researchers involved in all aspects of DME technology together to consider the state of the art in the scientific and engineering literature and to develop viewpoints on the research agenda needed to advance the application of DME. Current topics include fuel system challenges related to DME, with industry technical representatives, researchers and engineers involved in discussions about problems being observed, and potential solutions. The R&D Committee has also periodically provided a summary on recent research on DME, the number of technical papers being published on DME and the groups at various universities, institutes and companies actively publishing their DME related research.

 

"Oberon Fuels focuses on the monetization of wasted resources. The small-scale, modular Oberon process can convert various methane-containing feedstocks to a higher value commodity.  The ability to monetize waste streams, whether stranded gas or food waste, to produce a clean burning fuel such as DME is an exciting proposition."

Rebecca Boudreaux
President
Oberon Fuels

Oberon Fuels is leading commercial initiatives to enable the development of regional DME production in North America as well as driving the introduction of the necessary specifications, standards, and regulations at the federal and state levels for DME fuel applications.

Below, the company’s president Rebecca Boudreaux highlights the technology, strategy, and economics behind Oberon Fuels’ small-scale modular DME production technology and the important regulatory initiatives, in California and elsewhere, enabling DME’s introduction as a fuel in North America.

Click here for a recent interview with Rebecca by Virgin Unite, the non-profit foundation founded by Richard Branson that is responsible for market-driven low-carbon and climate initiatives such as the Carbon War Room.  Last year, Rebecca met with Richard Branson at his Necker Island (British Virgin Islands) home and discussed DME and Oberon Fuels' plans to commercialize small-scale plants enabling distributed production of the fuel throughout North America. Branson is well known for pursuing environmental and renewable energy projects, and has invested time and money to promote the expansion and growth of companies and technologies in the sector through vehicles such as the Carbon War Room and the Virgin Green Fund.

 

Question: Where do you see the most interest for Oberon Fuels’ small-scale DME production units – is there a specific industry sector or area for which this appears to provide the most compelling business case?

Oberon Fuels focuses on the monetization of wasted resources. The small-scale, modular Oberon process can convert various methane-containing feedstocks to a higher value commodity such as DME. As you can imagine, this has generated interest across a wide range of industries including those engaged in oil production and waste hauling. The ability to monetize waste streams, whether stranded gas or food waste, to produce a clean burning fuel such as DME is an exciting proposition.

Question: What are some of the main drivers behind interest in DME from those interested in producing it themselves?

The main drivers behind interest from these industries are 1) the opportunity to create a higher value product from waste streams, 2) emissions regulations, and 3) landfill diversion regulations banning food and green waste from landfill disposal.

Question: What are the regulatory obstacles to DME’s introduction as a transportation fuel in North America, and how are they being addressed?

In order to evaluate the regulatory hurdles for launching a new fuel in the U.S., you must look at both federal guidelines under the Environmental Protection Agency (EPA) and state regulations. With respect to the EPA, under Title 40 CFR Part 79, fuels and fuel additives that are used and sold for commercial, on-road applications must be registered with the EPA, however, this registration does not presently apply to DME.

While most states follow EPA guidelines, California has stricter regulations. However, California requires a fuel waiver and eventual certification to legally sell and distribute a fuel in the state.

Oberon received a fuel variance for DME in June 2013. As a condition, the development of an international consensus standard such as ASTM specification was required. In January 2014, an ASTM specification for DME as a transportation fuel (D7901-14) was published and is now available. This specification provides guidance for DME producers, infrastructure developers, and OEMs on the fuel quality required.

In parallel with filing for a fuel variance, we started working with California Air Resources Board (CARB) to initiate a Multimedia Assessment of DME as a fuel as part of the CARB fuel certification. This study will evaluate the effect of DME on air, soil, and water. Tier 1 of this study is underway and will provide an initial report on publicly available data for DME and its environmental effects. Based on this report, a testing plan will be developed and executed to fill in the data gaps.

Question: Delegates at the 6th International DME conference (DME 6) will be given an opportunity to visit Oberon Fuels’ DME production facility in the California desert. What will they see?

Oberon’s production facility is located in the Imperial Valley region, a two-hour drive east of San Diego. At the facility, you will see Oberon’s “Maverick” plant which produces DME from methanol, the last step of the Oberon process. The Maverick plant utilizes a novel catalytic distillation column to minimize footprint and fabrication costs. The first of its kind, the plant has a nameplate capacity of 4,500 gallons per day (2,400 diesel gallon equivalent/12.5 TPD of DME). It is producing DME that meets the ASTM fuel-grade specification and is being used in field test applications. The plant can operate as a stand-alone unit fed with methanol or as the final step in a full Oberon methane and carbon dioxide to DME plant.

 

"LPG infrastructure could be used to rapidly develop DME distribution with little investment required, given the scalable storage capacity and substantial and ever growing fleet of road and rail tankers already in service virtually anywhere a station is required to be located. This offers a tremendous advantage over the introduction of other fuel options."

Robin Parsons
President
Parafour Innovations

Robin Parsons is President of Texas based Parafour Innovations, a company providing innovative technologies to the growing alternative fuels market. With a combined experience of more than 75 years between its technical staff, Parafour specializes in numerous aspects of the industry including engine system development, fuel storage and distribution, refueling infrastructure and fuel management, and has extensive international experience.

Parafour engineers invented and patented the dual port injection rail system used on most new LPG applications and are working on an aftermarket solution for medium diesels to allow the use of DME. Parafour is also at the forefront of refueling dispensers and station designs, with the unique characteristics of these new fuels reflected in all design.

In this feature Robin shares insights into the technology and regulations behind DME refueling and dispensing equipment and the infrastructure required to enable DME’s introduction as a transportation fuel in North America.

Question: Given the similarities between DME and LPG, can equipment used with LPG Autogas vehicles be converted for use with DME?

From a refueling perspective, yes. DME is chemically different from LPG, however, and thus close attention must be given to the materials used in the construction of system components. Traditional seals and elastomers used for LPG are not compatible with DME above a minimum percentage, and must thus be changed. So functionally, other than the tank nozzle connection the equipment is the same but some internal materials must be modified. For the most part, the DME tolerant materials are completely compatible with LPG and therefore a “DME” station is actually compatible with LPG, which makes for some interesting possibilities in the near future.

Question: How could the existing LPG infrastructure and distribution network be leveraged for use with DME?

Given the minor modifications to equipment mentioned above to ensure chemical compatibility, the existing LPG distribution infrastructure could indeed be used for developing the market for DME. Not unlike pipelines or cargo tankers which can carry different products on different routes, so could LPG equipment potentially also be used for DME service.

Each alternative fuel has its own merits, but we have seen how the distribution and supply chain have limited CNG, E85, and B20 due to limited and specialized infrastructure. LPG infrastructure, on the other hand, could be used to rapidly develop DME distribution with little investment required, given the scalable storage capacity and substantial and ever growing fleet of road and rail tankers already in service virtually anywhere a station is required to be located. This offers a tremendous advantage over the introduction of other fuel options.

Question: What regulatory obstacles are there to the installation and use of DME refueling equipment in the United States right now? To the extent that there are obstacles, what action is being taken to address these?

Developing standards for DME’s use in North America is a high priority for the International DME Association, and its North American Affairs Committee is currently working with member companies and experts from the LPG industry to develop the necessary information and materials. The information already available and the relevant expertise from the LPG industry should enable efficient and rapid develop of robust safety-based standards tailored to the unique needs of the North American market.

In the absence of specific regulatory standards for DME we are currently relying on similar standards for hazardous areas electrical (e.g. UL 1238/1203) as well as existing standards for station design, equipment standards and metrology for similar fuels such as LPG (e.g. NFPA 58).

Question: What are the cost implications of installing DME refueling infrastructure suitable for a small fleet owner? How do these differ from those for other alternative fuels also being introduced for heavy-duty fleets, such as CNG and LNG?

Compared to CNG and LNG, the cost difference is remarkable. A station with a continuous filling capability of 10-15 gpm equivalent for CNG or LNG will cost upwards of $750,000 to $1 million. Furthermore, these stations will be limited to an installation area directly adjacent to a main natural gas line, or a liquefaction facility, whereas a DME station can be erected and put in service virtually anywhere. This offers not only a savings in the cost of infrastructure, but a savings through much more accessible and efficient refueling locations.

Compared with the cost of LPG infrastructure, there is a negligible difference. Our estimate is for a 10 – 15% premium on the overall cost of a typical LPG facility, where a properly designed and installed 2,000 gallon capacity LPG station (10 – 15 gpm filling capability) might cost $60,000 - $80,000. Companies such as Parafour are working to reduce that cost and better leverage asset investments for multiple uses.

Question: Are NTEP (weights & measurement accuracy) certification or product safety listings such as UL/ETL/FM required for DME refueling stations? If not, then why are they important?

As there are currently no specific standards for DME, there are no state or national requirements in the U.S. for such certifications and approvals directly. Yet indirectly there are requirements. From an accuracy point of view, the NCWM (National Conference of Weights and Measures) is the only U.S. recognized entity that can both certify and validate, through the NTEP certification process, that a dispenser is providing acceptable accuracy to the person purchasing the fuel. No gasoline, diesel, E85, etc… dispenser can be legally placed in service in the U.S. without first obtaining a certificate of conformance from NCWM/NTEP as well as confirmation of accuracy by the state weights and measures authority. The dispenser must then be tested periodically throughout the life of the equipment in service. Likewise for safety listings.

As seen in recent years in the LPG Autogas industry, local inspectors are increasingly requiring that the entire dispenser assembly be listed by UL/ETL or other recognized laboratory, to validate that it is safe for installation and use. This has limited growth in the LPG industry to a certain extent, as reluctance to pay for costly certifications has led to a lack of equipment in some states. Parafour has invested heavily to address these challenges for both DME and LPG, and will be the first and only company to have dispensing products which are both listed and certified by NCWM.

 

"Over time, our expectations and estimations of the opportunity for these trucks have grown significantly, and we have confidence in DME’s viability as a legitimate diesel substitute in the North American market."

Emmanuel Varenne
Director
Alternative Fuels Product Platform
Volvo Group


      

 

 

As Director of Alternative Fuel Platform Management for the Volvo Group, Emmanuel Varenne is leading efforts to deliver a DME-powered heavy-duty truck to the North American market. Emmanuel is a principal contributor to Volvo’s DME rollout strategy including evaluation of technical solutions and collaboration with fuel suppliers. Emmanuel is an active participant in the IDA’s North American Affairs Committee.

Below Emmanuel outlines the fundamentals of Volvo’s strategy for the introduction of heavy-duty vehicles running on DME, where DME fits within the company’s range of alternative driveline vehicles, and key drivers for interest from Volvo customers.

Question: What was the basis for Volvo’s decision to begin commercial production of heavy-duty trucks running on DME?

Volvo started to test DME on HD trucks as early as 2006. In 2009, a BioDME evaluation program was established in Sweden in collaboration with Chemrec and Preem. We launched a large-scale field test, running 10 trucks powered by a 13-liter Euro5 engine under normal conditions. The tests, originally planned to last only 3 years, were extended twice and are now scheduled to end in 2014, after accumulating more than 1.2 million kilometres (750,000 miles). In short, these are tried and proven trucks.

These tests helped demonstrate that DME was one of the most promising alternative fuel solutions, as it combines CO2 neutrality (when obtained from biomass) and diesel-like performance and operating procedures.

Over time, our expectations and estimations of the opportunity for these trucks have grown significantly, and we have confidence in DME’s viability as a legitimate diesel substitute in the North American market. We will continue to evaluate opportunities to commercialize the technology in other markets as well, particularly upon gauging the success in our launch markets.

Question: Where does DME fit in Volvo’s alternative driveline product range, and where does the company see DME being most relevant?

Volvo is convinced that there is no silver bullet when speaking about alternative drivelines. Each customer is specific in regards to access to the alternative energy, energy cost, and capacity of the customer to adapt its operation to the alternative considered. As such, DME will be part of the complete Volvo alternative driveline offering, from electro-mobility to biodiesel and natural gas, either compressed or liquefied. Electro-mobility will likely be the preferred customer alternative for urban applications (buses or delivery) with CNG as a complement. For more demanding haulage capacities and distances, LNG and DME will likely be the technologies of choice.

DME can be applicable to virtually all the demanding haul applications where fuel consumption is high enough to secure return on investment. Initially, Volvo is targeting regional haul as it seems to be the application that will most benefit from the advantages of DME. Further, these return-to-base applications limit concerns for expanded fueling infrastructure during the early phases of this initiative.

Question: How is a DME truck different from a standard diesel truck?

Honestly, this is one of the benefits of the technology which we are most excited about. The DME truck behaves very much like a diesel truck, due to the limited variation between the DME truck and the corresponding diesel truck. We hear regularly from customers that they would like the economic and regulatory benefits of an alternative fuel vehicle with the performance of a diesel engine, and DME can begin to achieve some of those ends.

The DME base engine is effectively identical to the diesel counterpart. The main difference comes in the fuel injection system where a specific high pressure pump and injectors are required to deliver the fuel to the engine. Likewise, the exhaust after-treatment system is very similar to the one used on modern diesel trucks with the notable exception of the diesel particulate filter (DPF), which isn’t needed with DME. In other words, under the hood, the DME experience is almost the same as diesel, but simpler.

Obviously the fuel tanks resemble propane tanks more than diesel tanks, and they require specific seals and material. This simple tank solution further allows us to limit the incremental cost of the DME truck, which customers will appreciate.

Question: What are the key attractions of DME for Volvo customers interested in running alternative fuel vehicles in their fleet?

The first thing customers will seek is obviously a positive business case compared to alternatives on the market. If a customer is going to forego a diesel engine in favor of DME, we want to make sure their payback period is as brief as possible. Now, it’s too early to discuss pricing of the truck or the fuel, but I can assure you that we’re talking with everyone involved in this proposition to ensure a compelling business case for the customers.

Secondly, customers are going to enjoy the simplicity of the DME truck versus a comparable diesel truck. Because DME produces no particulate matter, we’re able to confirm that the DME truck will have no DPF. This completely removes the need for regeneration and significantly reduces maintenance requirements. The DPF has historically been a headache for various reasons to truck owners, and we’ve received many positive reactions to its removal.

Third, and I referenced this previously, the DME customer gets the approximate horsepower, torque, and overall engine efficiency of a diesel truck. Imagine that – a customer can convert to an alternative fuel without sacrificing their diesel performance.

Finally, DME’s properties mitigate many of the concerns related to natural gas fuels. Unlike CNG’s requirements for high-pressure storage (3600 psi), DME can be stored at a low 75 psi, eliminating the requirement for expensive compressors. Furthermore, DME doesn’t require cryogenics, doesn’t vent, and doesn’t deteriorate over time like LNG.

Question: From a driver’s perspective, how is operating (driving, fueling, maintaining) a DME truck different from what they are currently doing with a diesel truck?

The driver will not feel any difference while driving DME trucks compared to the diesel trucks with which they’re familiar. Our Volvo I-Shift automated manual transmissions will be available as a base offer. The power and torque will be the same as that of diesel. In fact, we recently received remarks from a driver in one of our demo trucks that he loved the fact that he was passing other trucks on the road in a particularly mountainous region. Fueling will be similar to that of propane trucks with relatively low pressures (75 psi) and no cryogenic liquid handling. We don’t foresee the need for specialized equipment.

Question: How and where will the first DME trucks be introduced?

We plan to offer a limited production starting 2017, but it’s too early to comment beyond that. What I’ll say is that we are mindful of the presence of available fuel feedstock, the right regulatory environments, and eager early adopter customers. I think it is a fair expectation that fueling will largely be done “behind the fence” on customer sites in the early days. This lends itself nicely to the regional haul, daycab operations for which we are engineering the product.

Question: Does Volvo have plans to introduce heavy-duty trucks running on DME in other markets outside North America?

We prefer not to discuss future product plans in detail, so let me just say that we believe DME has the potential to be an exciting alternative fuel for heavy trucks in a variety of applications and markets.

 

"As DME moves up in the value chain from LPG to replace products like naphtha for olefins production, or diesel for transportation and power generation, the potential value and market size for DME is expected to grow."

Ben Iosefa
Vice President
Global Market Development &
Stakeholder Relations
Methanex

Ben Iosefa, the Vice President for Global Market Development and Stakeholder Relations at Methanex, currently serves as Chairman of the International DME Association and is actively involved in a number of initiatives worldwide related to DME and its use as an ultra-low emission alternative fuel. In this feature Ben looks at some of the principle drivers behind new investments in DME, and how the foundations for new opportunities are being laid in North America, Asia, Europe and elsewhere.

Question: What are the drivers behind the growing interest in DME today?

DME is a fuel used primarily for transportation, home cooking and heating that is produced directly or indirectly from biomass, natural gas, coal and many other carbon feedstocks. With the increasing price of crude oil and relative weakness in natural gas prices, this has opened up an opportunity for DME to take advantage of the difference in feedstock costs.

In a world that is increasingly short of diesel, DME offers an alternative to take relatively abundant natural gas and relieve some of the pressure on diesel supply chains. China, which regularly faces diesel and gasoline shortages, has been first to commercialize the use of DME as an LPG replacement on a mass scale but is now working on demonstrating the value of DME as a diesel substitute. DME has a high cetane number (measure of a fuel’s combustion quality), which makes it an excellent substitute for diesel.

In addition to replacing refined products like Liquid Petroleum Gas (LPG), diesel and even naphtha, DME has a number of safety and environmental benefits that give it additional value beyond its energy content. DME is clean burning, non-toxic and helps eliminate or reduce emissions such as particulates, SOx and NOx.

One recent example of the environmental benefits is DME’s ability to help Europe’s shipping industry meet more stringent environmental regulations. The Sulphur Emissions Control Area (SECA) in Northern Europe has tighter emissions regulations coming into effect in January 2015, requiring ships to meet lower SOx and NOx emissions targets. DME has been identified as one of the leading environmentally friendly, low cost fuels that allow shipping companies to achieve the new emissions targets. Methanex are working with companies such as Stena, Wartsila, Haldor Topsøe, Lloyd’s Register, SSPA and ScandiNAOS to demonstrate the use of DME as a marine fuel. Due to the potential for DME to help meet Europe’s goals, four government funded agencies have agreed to support this work and cover 50% of the project costs.

Question: In your opinion what are the major opportunities for DME today?

DME is a versatile and basic building block for many products which means there are a wide variety of potential growth paths for DME. Initially, DME's fuel value as a replacement for oil products like LPG, diesel, and natural gas was targeted but an emerging opportunity exists in the olefins business where DME can be used to make olefins and plastics.

Like LPG, DME can be stored and transported in cylinders and is often a lower cost option than installing a new natural gas pipeline or grid in areas with low population density or in outlying regions. This is partly driving the enthusiasm behind the use of DME in countries like China, Indonesia, and India.

As DME moves up in the value chain from LPG to replace products like naphtha for olefins production, or diesel for transportation and power generation, the potential value and market size for DME is expected to grow. DME is a relatively straightforward product to use as a substitute for LPG when blended in quantities of 20% or less because few changes are needed to infrastructure or equipment. This, along with DME's cost advantages, has led to the rapid growth of DME for LPG blending.

The next large and developing DME energy application is to replace diesel in modified on-road diesel engines. A great deal of research and road testing has been completed in this area in countries like Japan, Sweden, and China. Almost all of the technical hurdles have been overcome with next generation DME engines now being demonstrated. In addition, the costs to develop DME infrastructure for transportation are typically less than other alternative natural gas derived fuels such as CNG and LNG. DME not only helps to drastically reduce emissions from diesel engines, but it also helps countries achieve another common policy objective which is to reduce reliance on crude oil and to open up the transportation industry to fuels produced from alternative feedstocks such as natural gas and biomass.

Question: What are the key risks to growth and how can these be managed?

The main challenges to DME's ongoing growth are related to 1) ensuring there is an appropriate level of political support for the product and 2) ensuring safe handling procedures are well understood and followed by companies in the supply chain as well as end consumers.

While DME is a relatively safe product that is environmentally benign, it nevertheless requires that appropriate standards and regulations are in place and that safe handling procedures are followed. This is the case for all fuels and chemicals.  In the early stages of introduction of a product like DME, there needs to be a laser-like focus on preventing health and safety incidents from occurring.

Politically, DME needs to be given the opportunity to compete on a level playing field with incumbent fuels and other alternative fuels so that the market decides on the fuel of choice. There are always competing interests that do not wish to see a new fuel introduced, regardless of the ongoing cost increases consumers face due to the rising price of crude oil and its products. However, in many countries the strategic driver to reduce dependence on crude oil and minimize the impact of fuels on the environment has grown and created an opportunity for DME to play a role in the fuels pool.

Question: How does the International DME Association promote and support the use of DME globally?

The IDA is an important forum for international experts, including companies producing or planning to produce DME to come together and help shape the industry. Members play an active role in progressing regional initiatives, allocating funds and monitoring key research opportunities, and recommending standards and regulations. An ethic of environment, health and safety underpins all of the work the IDA undertakes. Each of the core areas of focus is then translated into regional initiatives that draw on the global experience of member companies.

High priority items are identified by the board of directors with input from member companies and then plans are developed and implemented that support the IDA's overall goals.  For example, the IDA has recently developed several important papers in collaboration with the World LP Gas Association, including safe handling guidelines, and a recommended DME/LPG blending standard for use in China.  The IDA’s North American Affairs Committee (led by an executive from member company Oberon Fuels – the first company to market with fuel grade DME in North America) is leading the effort to establish the necessary standards and to ensure compliance with applicable regulations for transportation fuels in the United States, ahead of the introduction by Volvo and Mack Trucks of heavy duty vehicles running on DME.

 

 


 

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International DME Association
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