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Our partner |
| "The process to uprade it to the quality of natural gas and feed it in as biomethane in the existing natural gas supply will become the key processes of the biogas technology" |
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DGE(Dr Ing. Günther Engineering) is developing and constructing facilities for environmental and process engineering processes. Their clients are companies from the chemical and pharmaceutical industry. DGE is developing technologically demanding solutions and can use the know-how of the company which is built on experience and own research and development programs.
The computation of the technical components is carried out with complex calculations programs.
In in-house research and development and in cooperation with other companies, technologies for the
treatment of flue gas and waste water besides recycling were enhanced. These technologies are components of system which can be assembled for new solutions. In several pilot plants with a comprehensive
measurement technique, that technology was perfected. This concept enables optimal technical and
economical solutions for different kind of application.
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There are more opportunities in the future
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The challenge with on-site power generation biogas facilities is how to utilize the heat to increase
the efficiency.
Since not every biogas facility is located in an industrial area, mostly there is no possibility to utilize
(or sell) the excess heat.
The on-site power generation is mostly inefficient. The use of central power generation is preferred for
an economic utilization of power and heat. Biogas consists to 50 – 60 % of methane, which is also
the main component of natural gas. The existing public natural gas supply could be used to
transport the biogas after it has been upgraded to a similar quality of natural gas.
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The applications for this conditioned, high-purity gas are unlimited. With the feed in of the biogas in the public natural gas supply and the utilization in a combined heat and power unit, it would be possible to use this high-value energy source more efficient.
- The key for future energy sources is a decentralised production together with a centralized utilization. Bio methane shows already today how it can work.
- In Germany 50% of the energy consumed is used as heat.Bio methane is an ideal fuel for the generation of heat.
- Bio methane is the fuel of the future for converted vehicles.
The ability to store the energy as a liquid gas opens up more
economic and ecologic opportunities.
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From the field into the public natural gas supply
The raw biogas which contains methane is a by-product of anaerobic decomposition of organic matter, such as animal manure and human waste. Depending on the kind of substrate the methane content is
50-60 %. The other main constituent is carbon and in low amounts sulphur, nitrogen and oxygen
are present. During the conditioning (on-site or centralized) the biogas will be processed into high-purity bio methane.
MT-BIOMETHAN®
Gas Upgrading Technology with the procedure of BCM® of DGE Dr Ing. Günther Engineering
Flow chart of the pressure less gas scrubbing with amine solution
The biogas conditioning technology Biomethan® is upgrading the biogas originated from the anaerobic decomposition of organic matter to the quality of natural gas. The BCM-Process® in
accordance with Dr. Ing. Günther Engineering is using a pressure less gas scrubbing with amine solution.
To extract high-purity methane, the cleaning of the raw biogas is divided in different stages. In the first stage the hydrogen sulphide will be removed.
Flow chart of the gas upgrading technology:
E=Heat exchanger P=Pump F=Separator/Reactor
In the next stage the gas scrubbing the biogas is treated with an amine solution in a pressure less environment, which will remove the CO2 up to < 0, 5 Vol. %.
After this stage the amine solution will be heated in the regeneration unit. During this process the chemical bonded CO2 will be separated from the amine solution. Before the regenerated amine solution is returned to the gas scrubbing process, it will be cooled in a heat
recovery unit.
The heat energy of the gasoline by-product CO2 (which contains parts of gasoline water) will be also recovered.
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BCM-Process® compared with conventional gas cleaning technologies
Pressure Swing Adsorption (PSA)
The PSA is an continuously working process, which plays on the different adsorption characteristics of carbon dioxide and methane on an activated carbon filter combined with increased pressure. Because adhesion between carbon dioxide and an activated carbon filter is much tighter than the adhesion between a methane and an activated carbon filter, the methane can therefore be separated. Afterwards the adsorber is regenerated through a vacuuming proces. The cleaning process and the regeneration take place parallel in several absorbers.
Pressurized gas scrubbing
The continuously working, pressurized gas scrubbing is based on the differentsoluabilities of carbon dioxide and methane in water. Absorption depends on pressure, relation between biogas and water and on the temperature of the water. The water loaded with carbon dioxide can be recycled in a desorption.
Selexol gas scrubbing
Gas scrubbing with selexol is a modification of the pressurized gas scrubbing, but in this case instead of water,selexol is used. The soluability of methane is better than with pressurized gas scrubbing. But the process is exacerbated by the hygroscopic characteristics of selexol.
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Karsten Wünsche
(MT-Biomethan)
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Advantages of the BCM-Process®*
1. High concentration of methane
With the mentioned processes it is not possible to remove air from the gas. If the sulphur is removed
biologically from the biogas, the content of air in the bio methane is 3-5 %. Common cleaning processes can reach <2 % CO2. Typical methane concentration after the conditioning is about 93 to 96%.
Due to an alternative desulphurisation and pressure less gas scrubbing with amine solution (BCM-process®)
a methane concentration of up to 99, 5 % can be reached.
In the most cases the high concentration of methane allows to feed in the bio methane without additional LPG to the public natural gas supply.
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2. Low energy consumption*
Basis is a NaWaRo facility with a capacity of 250 Nm3/h biogas.
As of now PSA is the most economical solution. But the pressure less gas scrubbing with amine solution consumes only 41% of the energy of PSA. Even to pressurize the bio methane to the same pressure like used in PSA, the energy saving will be still 26%.
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3. Minimum losses of methane*
Methane loss during the conditioning can not be avoided but there are economical and ecological reasons to optimize this process.
DWW and PSA show the same methane loss. Due to the used solution in the Selexol process, it would be necessary to implement a second gas scrubbing stage to reduce methane loss to 2 %. This results in an upscale of the solution regeneration process.
Because of the high selectivity of the BCM-solution high-purity methane with a minimal methane loss can be produced, the most important point for an economically conditioning of biogas.
* Source: Extracts from the proceedings of the Symposium „INNOGAS“, 27.10.2006, Lutherstadt Wittenberg
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MT-BIOMETHAN® 
