fluidized bed boiler

Fluidized Bed Boiler
www.FluidizedBedBoiler.com

Fluidized Bed Boilers & Fluidized Bed Combustion
for Clean Power Generation

Inquiries, call/email:

Tel. (88321)4 758 -100270

Email: info@FluidizedBedBoiler.com

Fluidized Bed Gasification Plant
from 5 MW to 100 MW (or any size in between)
Capable of Producing Synthesis Gas from Practically
Any Biomass/Organic Waste-stream

Our renewable energy engineering and renewable energy project development services include: Carbon Credits and Carbon Emissions Consulting, Design, Engineering, Environmental, Feasibility Studies, Feedstock, Legal, Onsite Power Generation (cogeneration or trigeneration) & Greenhouse Gas Emissions consulting for projects located in the U.S. and Canada.

What is a Circulating Fluidized Bed Boiler?

A Circulating Fluidized Bed Boiler is a fully contained state-of-the-art technology for processing solid fuels where fuel is suspended in a mixture of superheated air and sand, collectively called the "fluid bed." Reagents like limestone are added, and temperatures are controlled to directly capture the sulfur and reduce formation of Nitrogen Oxides.

Circulating Fluidized Bed Boilers produce 90% fewer emissions compared to typical coal fired power plants.

Fluidized Bed Boilers, a Bed for Burning Coal?

It was a wet, chilly day in Washington DC in 1979 when a few scientists and engineers joined with government and college officials on the campus of Georgetown University to celebrate the completion of one of the world's most advanced coal combustors.

It was a small coal burner by today's standards, but large enough to provide heat and steam for much of the university campus. But the new boiler built beside the campus tennis courts was unlike most other boilers in the world.

A Fluidized Bed Boiler

In a fluidized bed boiler, upward blowing jets of air suspend burning coal, allowing it to mix with limestone that absorbs sulfur pollutants.

It was called a "fluidized bed boiler."

In a typical pulverized coal boiler, coal is crushed into very fine particles, blown into the boiler, and ignited to form a long, lazy flame. In other types of boilers, the burning coal simply rests on grates. But in a "fluidized bed boiler," crushed coal particles "float" inside the boiler, suspended on upward-blowing jets of air. The red-hot mass of floating coal — called the "bed" — would bubble and tumble around like boiling lava inside a volcano. Scientists call this being "fluidized." That's how the name "fluidized bed boiler" came about.

Why does a "fluidized bed boiler" burn coal cleaner?

There are two major reasons fluidized bed boilers are cleaner, and superior to typical coal fired power plants. One, the tumbling action allows limestone to be mixed in with the coal. Remember - limestone is a "sulfur sponge" in that it absorbs sulfur pollutants. As coal burns in a fluidized bed boiler, it releases sulfur. But just as rapidly, the limestone tumbling around beside the coal captures the sulfur. A chemical reaction occurs, and the sulfur gases are changed into a dry powder that can be removed from the boiler. (This dry powder — called calcium sulfate — can be processed into the wallboard used for building walls inside our houses.)

The second reason a fluidized bed boiler burns cleaner is that it burns "cooler." Cooler in this sense as it is still fairly hot at about 1400 degrees F. But older coal boilers operate at temperatures nearly twice that (almost 3000 degrees F). Also, recall that nitrogen oxides form when a fuel burns hot enough to break apart the nitrogen molecules in the air and cause the nitrogen atoms to join with oxygen atoms. But 1,400 degrees isn't hot enough for that to happen, so few nitrogen oxides forms in a fluidized bed boiler.

Coal Gasification

Don't think of coal as a solid black rock. Think of it as a mass of atoms. Most of the atoms are carbon. A few are hydrogen. And there are some others, like sulfur and nitrogen, mixed in. Chemists can take this mass of atoms, break it apart, and make new substances — like gas!

One of the most advanced - and cleanest - coal power plants in the world is Tampa Electric's Polk Power Station in Florida. Rather than burning coal, it turns coal into a gas that can be cleaned of almost all pollutants. This technology is called coal gasification.

How do you break apart the atoms of coal? You may think it would take a sledgehammer, but actually all it takes is water and heat. Heat coal hot enough inside a big metal vessel, blast it with steam (the water), and it breaks apart. Into what?

The carbon atoms join with oxygen that is in the air (or pure oxygen can be injected into the vessel). The hydrogen atoms join with each other. The result is a mixture of carbon monoxide and hydrogen — this is called "Synthesis Gas."

Now, what do you do with the Synthesis Gas?

You can burn Synthesis Gas - very cleanly - and use the hot combustion gases to spin a gas turbine to generate electricity. The exhaust gases coming out of the gas turbine are hot enough to boil water to make steam that can spin another type of turbine to generate even more electricity. But why go to all the trouble to turn the coal into gas if all you are going to do is burn it?

A major reason is that the impurities in coal — like sulfur, nitrogen and many other trace elements — can remove practically all of the pollutants when coal is changed into Synthesis Gas through Coal Gasification. In fact, scientists have ways to remove 99.9% of the sulfur and small dirt particles from the coal gas. Coal Gasification is one of the best ways to clean pollutants out of coal.

Another reason is that the coal gases — carbon monoxide and hydrogen, or simply "Synthesis Gas" — don't have to be burned. They can also be used as valuable chemicals. Scientists have developed chemical reactions that turn carbon monoxide and hydrogen into everything from liquid fuels for cars and trucks to plastic toothbrushes! Today, in Tampa, Florida, and West Terre Haute, Indiana, there are power plants generating electricity through "coal gasification" instead of burning it. At a plant in Kingsport, Tennessee, coal gas is being used to make plastic for photographic film and to make methanol (a fuel that can be burned in automobile engines).

Coal Gasification could be one of the most promising ways to use coal in the future to generate electricity and other valuable products. Yet, it is only one of an entirely new family of energy processes called "Clean Coal Technologies" — technologies that can make fossil fuels future fuels.

What is Fluidized Bed Combustion?

Fluidized beds suspend solid fuels on upward-blowing jets of air during the combustion process. The result is a turbulent mixing of gas and solids. The tumbling action, much like a bubbling fluid, provides more effective chemical reactions and heat transfer. Fluidized bed combustion evolved from efforts to find a combustion process able to control pollutant emissions without external emission controls (such as scrubbers). The technology burns fuel at temperatures of 1,400 to 1,700 degrees F, well below the threshold where Nitrogen Oxides form (at approximately 2,500 degrees F, the nitrogen and oxygen atoms in the combustion air combine to form nitrogen oxide pollutants).

The mixing action of the fluidized bed results brings the flue gases into contact with a sulfur-absorbing chemical, such as limestone or dolomite. More than 95 percent of the sulfur pollutants in coal can be captured inside the boiler by the sorbent.

Pressurized Fluidized bed combustion (PFBC) builds on earlier work in atmospheric fluidized-bed combustion technology. Atmospheric fluidized bed combustion is crossing over the commercial threshold, with most boiler manufacturers currently offering fluidized bed boilers as a standard package. This success is largely due to the Clean Coal Technology Program and the Energy Department's Fossil Energy and industry partners’ R&D.

The popularity of fluidized bed combustion is due largely to the technology's fuel flexibility - almost any combustible material, from coal to municipal waste, can be burned - and the capability of meeting sulfur dioxide and nitrogen oxide emission standards without the need for expensive add-on controls.

The Clean Coal Technology Program led to the initial market entry of 1st generation pressurized fluidized bed technology, with an estimated 1000 megawatts of capacity installed worldwide. These systems pressurize the fluidized bed to generate sufficient flue gas energy to drive a gas turbine and operate it in a combined-cycle.

The 1st generation pressurized fluidized bed combustor uses a "bubbling-bed" technology. A relatively stationary fluidized bed is established in the boiler using low air velocities to fluidize the material, and a heat exchanger (boiler tube bundle) immersed in the bed to generate steam. Cyclone separators are used to remove particulate matter from the flue gas prior to entering a gas turbine, which is designed to accept a moderate amount of particulate matter (i.e., "ruggedized").

A 2nd generation pressurized fluidized bed combustor uses "circulating fluidized-bed" technology and a number of efficiency enhancement measures. Circulating fluidized-bed technology has the potential to improve operational characteristics by using higher air flows to entrain and move the bed material, and re-circulating nearly all the bed material with adjacent high-volume, hot cyclone separators. The relatively clean flue gas goes on to the heat exchanger. This approach theoretically simplifies feed design, extends the contact between sorbent and flue gas, reduces likelihood of heat exchanger tube erosion, and improves SO2 capture and combustion efficiency.

A major efficiency enhancing measure for 2nd generation pressurized fluidized bed combustor is the integration of coal gasification to produce Synthesis Gas. This fuel gas is combusted in a topping combustor and adds to the combustor's flue gas energy entering the gas turbine, which is the more efficient portion of the combined cycle. The topping combustor must exhibit flame stability in combusting low-Btu gas and low-NOx emission characteristics. To take maximum advantage of the increasingly efficient commercial gas turbines, the high-energy gas leaving the topping combustor must be nearly free of particulate matter and alkali/sulfur content. Also, releases to the environment from the pressurized fluid bed combustion system must be essentially free of mercury, a soon-to-be regulated hazardous air pollutant.

To reduce cost and carbon dioxide emissions, new sorbents are being evaluated. Sorbent utilization has a major influence on operating costs, and carbon dioxide emissions streams can result in the production and use of alkali-based sorbents.

Efforts are ongoing at the Power Systems Development Facility (PSDF) in Wilsonville, Alabama to ensure critical components and subsystems are ready for demonstration of 2nd generation pressurized fluidized bed combustion. The PSDF is operated by Southern Company Services under DOE contract to conduct cooperative R&D with industry.

Tests conducted at the PSDF in 1998 verified that a newly developed multi-annular swirl burner (MASB) provided the needed flame stability and low-NOx performance characteristics. Tests of promising new hot gas filter components and systems are continuing at the PSDF. Advances made to date in this critical technology area include the development of clay-bonded silicon carbide candle filters and the associated filter vessel. Efforts are currently focused on improved candle filter materials for enhanced durability under extreme temperatures and corrosive environment. New ceramics and ceramic-metallic composites are showing promise. Those passing laboratory screening tests will undergo testing at the PSDF.

New technologies in the "natural gas to liquids" industry decreases expenses through increased efficiencies and converts natural gas to ultra clean fuel. These facilities typically consist of three primary components: an autothermal reformer that converts the natural gas into synthesis gas, a mixture of carbon monoxide and hydrogen; a Fischer-Tropsch unit that produces synthetic crude oil from the synthetic gas; and a refining unit that upgrades the synthetic crude to ultra clean fuels. These fuels, which can then be transported through existing pipelines, are now being tested in bus fleets operated by the Washington, DC, Metropolitan Area Transit Authority and the National Park Service in Denali, Alaska.

Secure and reliable energy supplies are the backbone to
our country's freedom and economic viability

While the United States is home to an abundant supply of both natural gas and oil, there exists a supply and demand gap because much of the conventional resource base has been harvested.

Future sources of supply will come from more remote locations, increasingly complex and deeper reservoirs, and more environmentally sensitive areas. New technologies will certainly be needed to develop these resources in an environmentally and economically acceptable manner. With advanced technologies, our Nation can continue producing these valuable domestic resources while also meeting environmental protection goals.

Clean Power Generation

The clean-burning properties of natural gas make it a preferred fuel for power generation. Indeed, natural gas consumption in the power generation sector is projected to increase from 5.0 trillion cubic feet in 2003 to 9.4 trillion cubic feet in 2025. Cost-effective production, processing, transmission, and storage technologies will enable natural gas to fulfill this central role in meeting our Nation’s growing electricity needs.

However, with the recent problems relating to the price of natural gas as well as the potential harm all fossil fuels may be causing to the climate and the planet, now is the time to begin placing greater emphasis on the production of energy from fuels that do not cause such economic and environmental liability.

Best of all, all of these renewable fuels and produced in the USA - most produced from waste streams from wastewater treatment plants, landfills/municipal solid waste, and agricultural waste streams such as corn stover, rice hulls and the manure from dairy farms, chicken farms and hog farms.

Turnkey Biomass Gasification Plants,
Biomass Gasification Engineering and Feasibility Studies

We provide turnkey Biomass Gasification plants as well as Engineering and Feasibility Studies for clients considering Biomass Gasification under a strict "vendor neutral" basis.

Our Biomass Gasification Feasibility Studies form the basic foundation in our client's decision-making process and the critical answers they seek regarding Biomass Gasification - do we move forward with our plans to build a Biomass Gasification plant? Where should it be built? What are the optimum biomass feedstocks for this location? What size plant should we build? Who should build it? Which Biomass Gasification plant do we choose? Can we sell our excess power to the grid?

Our Biomass Gasification Feasibility Study will answer these important questions and more. In the event you decide to move forward with our Biomass Gasification Engineering and Feasibility Study. We require a 50% deposit to begin work.

We provide Biomass Gasification plant development services including feasibility studies or a vendor-neutral basis. Biomass Gasification plants provide our clients with maximum returns, which means the highest revenues with the lowest operating costs, from practically any biomass feedstock. Our knowledge and expertise will help you maximize Biomass Gasification revenues at your facility.

The Synthesis Gas is then used like any other fuel, such as natural gas, which is not a renewable fuel.

Biomass Gasification Basics

Biomass fuels such as firewood and agriculture-generated residues and wastes are generally organic. They contain carbon, hydrogen, and oxygen along with some moisture. Under controlled conditions, characterized by low oxygen supply and high temperatures, most biomass materials can be converted into a gaseous fuel known as producer gas, which consists of carbon monoxide, hydrogen, carbon dioxide, methane and nitrogen. This thermo-chemical conversion of solid biomass into gaseous fuel is called biomass gasification. The producer gas so produced has low a calorific value (1000-1200 Kcal/Nm3), but can be burnt with a high efficiency and a good degree of control without emitting smoke. Each kilogram of air-dry biomass (10% moisture content) yields about 2.5 Nm3 of producer gas. In energy terms, the conversion efficiency of the biomass gasification process is in the range of 60%-70%.

Multiple Advantages of Biomass Gasification

Conversion of solid biomass into combustible gas has all the advantages associated with using gaseous and liquid fuels such as clean combustion, compact burning equipment, high thermal efficiency and a good degree of control. In locations, where biomass is already available at reasonable low prices (e.g. rice mills) or in industries using fuel wood, Biomass Gasifiers offer definite economic advantages. Biomass gasification technology is also environment-friendly, because of the firewood savings and reduction in CO2 emissions.

Biomass gasification technology has the potential to replace diesel and other petroleum products in several applications, foreign exchange.

Applications for Biomass Gasification

Thermal applications: cooking, water boiling, steam generation, drying etc. Motive power applications: Using producer gas as a fuel in IC engines for applications such as water pumping Electricity generation: Using producer gas in dual-fuel mode in diesel engines/as the only fuel in spark ignition engines/in gas turbines.

What are Biomass Gasifiers?

Biomass Gasifiers are reactors that heat biomass in a low-oxygen environment to produce a fuel gas that contains from one fifth to one half (depending on the process conditions) the heat content of natural gas. The gas produced from a Biomass gasifiers can drive highly efficient devices such as turbines and fuel cells to generate electricity.

Biomethane is "renewable natural gas" which is produced in our Anaerobic Digesters. Biomethane is also generated by the decomposition of organic materials buried in landfills. We provide "Landfill Gas To Energy" technologies that utilize "methane recovery" systems to recover the Biomethane. The process of Biomethane production begins with organic materials and organic waste streams. Biogas is first produced from the decomposition of these organic materials but because biogas is dirty, and would destroy engines and gas turbines, the biogas first needs to be purified and cleaned - this "biogas to biomethane" process removes the impurities in the biogas, such as carbon dioxide and hydrogen sulfide (H2S).

"Cleaned-up" and ready for use in an onsite cogeneration or trigeneration power plant, the Biomethane could also be sold to a pipeline company and completely replace the "natural gas" that is typically transported to markets via the vast underground pipeline system.

Biomethane will some day replace the "methane" or most of the methane that is sold by the local gas companies - the methane they presently provide is all generated from "fossil fuels."

Biomethane has an unlimited supply, whereas the methane sold by gas companies has a limited supply. Biomethane is renewable, whereas the methane sold by your gas utility company is not renewable. Biomethane recovery, use and production generates "Greentags" or a "Renewable Energy Credit" for the owners and is GOOD for our environment. The production and use of the natural gas sold by the gas company does NOT generate these incentives and new revenue streams and is NOT good for our environment.

As previously mentioned, Biomethane is "naturally" produced from organic materials as they decay. Sources of Biomethane include; landfills, POTW's/Wastewaster Treatment Systems, and every tree or agricultural product that is no longer living. Biomethane also generated from animal operations where manure can be collected and the Biomethane is generated from anaerobic digesters where the manure decomposes.

Biomethane, after installation of the Biomethane equipment is essentially free, as opposed to buying natural gas, presently costing around $10.00/mmbtu.

Methanogenesis, also called Biomethanation, is the production of CH4 and CO2 by biological processes that are carried out by methanogens.

Sewage Sludge
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We Turn Your City or County's Sewage Sludge Problems
into Profits and Green Energy!

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According to the United Nations: "It is estimated that Greenhouse Gas Emissions trading markets could be worth $2 Trillion by 2012."

As Biomethane is a near perfect fuel, and since Biomethane represents the best of all biofuels in terms of Recycling Carbon, and has the highest Net Energy Balance, and as Biomethane technologies such as Anaerobic Digesters and Biomass Gasification development increases and becomes even more commonplace, one of the fundamental questions is: what is the size of the potential biomass resource supply in the U.S.?

In April 2005, the DOE and the U.S. Department of Agriculture (USDA) co-published a report assessing the potential of the land resources in the U.S. for producing sustainable biomass: Biomass as Feedstock for a Bioenergy and Bioproducts Industry: The Technical Feasibility of a Billion-Ton Annual Supply. Looking at forestland and agricultural land, the two largest potential biomass sources, this study estimates that the U.S. can sustainably produce up to 1.3 billion tons of biomass feedstock by mid-century. This would be enough feedstock to produce 60 billion gallons of B100 Biodiesel and E100 Ethanol with today's technologies.

This study doesn't address the opportunities for Biomethane production from biomass feedstock or Biomass Gasification technologies. Some recent estimates indicate that Biomethane could replace up to 50% of present natural gas consumption in the U.S. and in some countries, such as Iceland, Biomethane already provides 100% of the natural gas requirements.

There are many assumptions in the Billion Ton Study report that impact these estimates, but we believe the estimates reasonably reflect the potential availability and impact of biomass resources.

Of the total estimated resource, the study suggests that forestlands in the contiguous United States can produce approximately 368 million dry tons annually. This projection includes 52 million dry tons of fuelwood harvested from forests and woodlands, 145 million dry tons of residues from wood processing mills and pulp and paper mills, 47 million dry tons of urban wood residues including construction and demolition debris, 64 million dry tons of residues from logging and site clearing operations, and 60 million dry tons of biomass from fuel treatment operations.

By "converting" biomass wastes – such as municipal solid waste, sewage sludge, crop residues, energy crops, and manure – into biofuels, this will resolve the energy, environmental and political problems in an economical and environmentally sound manner - that will produce over one million new jobs.

According to Jeff Seisler, Director of the European Natural Gas Vehicle Association, "Biomethane has an outstanding potential as a multifaceted solution to multifaceted social problems: urban and agricultural waste management, water purification, and clean air. Urban and agricultural waste can be processed into usable methane, as can the sewage during the water purification process. Cleaning and compressing the gas for use in vehicles then provides cleaner air than petroleum-consuming vehicles."

Continuing, Mr. Seisler states about Biomethane; "this environmental 'closed loop waste-to-energy-to-fuel used in vehicles that again truck the next load of waste to the energy processing plants-substitutes fossil fuels with a renewable resource and reduces greenhouse gases 100% as compared to over gasoline vehicles (on a well-to-wheel basis).

According to Peter Boisen Chairman, of ENGVA, "various well respected European research institutes now estimate more than three times better fuel output per hectare of land used than if going for ethanol or biodiesel. Sweden currently has a 51% Biomethane share, and Switzerland 37%. France, Norway, Germany and Austria use smaller amounts for vehicles. Iceland, completely without natural gas, uses 100% biomethane in its NGVs," Boisen says. Continuing, Boisen adds, "China, India, Korea, the Ukraine, Spain and Italy are other examples of countries now starting up projects where Biomethane will be used as a vehicle fuel."

"With the energy efficiency of the gas production process at 50% to 70% it's hard to think of a more socially acceptable and economic energy value for the transportation sector," Boisen says.

"Governments need to get out of their liquid fuel paradigm to refocus and balance their policies and communications to support the development of a Biomethane infrastructure. In Europe Biomethane has the potential to replace 20% of the petroleum consumed in the transport sector by 2030."

Thursday, 29 June 2006
Sacramento, California USA and Sweden

In a ceremony held at the Ministry of the Environment in Stockholm, representatives of the Kingdom of Sweden and the State of California signed an agreement pledging the two governments and their related industries to work together to develop bioenergy, with a particular emphasis on Biomethane.

“Through a strong working relationship between its industry and government, Sweden is showing how bioenergy can be developed in a cost-effective manner that benefits its economy and environment. We are extremely pleased to have signed this Memorandum of Understanding (MOU) that will provide a basis for intensified collaboration between Swedish and California officials to develop a thriving bioenergy industry in California,” said Joe Desmond, Undersecretary for the California Resources Agency.

In particular, Sweden has been a global leader in terms of converting biowaste, largely agricultural material and residues, into usable Biomethane. This gas is then used to either generate electricity, residential heating, or as a transportation fuel.

More than 8,000 vehicles in Sweden are powered by a combination of natural gas and Biomethane. The vehicles include transit buses, refuse trucks, and more than 10 different models of passenger cars. There are more than 25 Biomethane production facilities in Sweden and 65 filling stations. The Swedish Biomethane industry has been growing at an annual rate of about 20 percent over the last five years.

According to the Swedish Gas Association, more than 50 percent of the methane used to power Sweden’s natural gas vehicles now comes from biological sources, up from 45% last year. Natural gas vehicle sales in Sweden are increasing at the rate of 25% per annum.

Sweden was motivated to develop its Biomethane industry because it has no natural gas reserves, to more efficiently manage its waste, and to meet its obligations under the Kyoto Accord. Since Biomethane is developed from methane sources that would normally release into the atmosphere, it’s considered one of the most climate friendly fuels. Methane (and Biomethane) is 21 times more reactive as a greenhouse gas than carbon dioxide (CO2). Sweden is currently meetings its objectives and schedule as outlined in the Kyoto accord.

Biomethane is developed by heating up and breaking down biomaterials in an (Anaerobic Digesters) digester. Among other raw materials, Swedish operators feed their Anaerobic Digesters with slaughterhouse waste, swine manure, and even grassy crops. After the materials breakdown over a 20 day period, technology is then used to remove the impurities and produce Biomethane. Once cleaned-up, Biomethane is 98 percent methane and easily meets the Swedish and California pipeline standards.

The Memorandum of Understanding can be accessed on the California Resources Agency Web site: http://resources.ca.gov/press_documents/CaliforniaSwedenBiofuelsMOU.pdf

Our Lead Engineer has Over 27 Years Experience in Anaerobic Digester Design, Engineering and Operations - We are now Designing and Building the World's best Anaerobic Digesters.

2. Anaerobic Digesters mitigate and reverse climate change and global warming by preventing Biomethane to escape into the atmosphere, which is one of the major causes of climate change and global warming.

3. Anaerobic Digesters are vital for renewable energy production and helping our country's drive for energy independence.

4. EVERY wastewater treatment plant as well as ALL Concentrated Animal Feeding Operations (CAFO's) - IN EVERY COUNTRY - will soon be installing Anaerobic Digesters to prevent Biomethane from entering the atmosphere and help reverse climate change as well as for use as a renewable fuel. Or, they will be replacing their existing inefficient and inferior mechanical wastewater treatment plants, with our "Natural Wastewater Treatment" plants!

5. The country of Sweden is the global leader in Biomethane production. Sweden has identified the Biomethane opportunities and is converting biowaste derived from agricultural material and residues into usable Biomethane. The Biomethane is used to generate clean, renewable electricity, residential heating, and also as a transportation fuel. Biomass sources make up 45% of Sweden’s Biomethane. Sweden's Biomethane industry has been growing at an annual rate of around 20% over the last five years. Biomethane powers more than 8,000 transit buses, garbage trucks, and 10 different models of passenger cars in Sweden. Sweden now has more than 25 Biomethane production facilities and 65 filling stations. The country believes that since Biomethane is developed from natural, organic sources that would have been released into the atmosphere, that Biomethane is considered one of the most climate-friendly fuels. Biomethane is 98% methane and easily meets the Swedish and California pipeline standards.


	A natural gas to liquids, or "gas liquefaction" ultra clean fuels facility in the U.S.



	America's demand for natural gas is expected to grow as much as 50% by 2025. Unconventional gas resources, much of which currently are not economically recoverable, are expected to bear much of the burden of meeting this demand.