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Our partner |
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processes to upgrade it to the quality of natural gas and feed it in as
bio methane 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
Pressurized gas scrubbing: Common gas scrubbing with amine solution to
remove CO2 and H2S, which is state of the art in the oil industry, is
pressurized. The BCM-Process® is the first process which can be
realized without pressure due to optimized conditions. This results in
low height of the scrubber columns which could not be reached with a
pressurized gas scrubber.
Pressure Swing Adsorption (PSA):
PSA is a technology that is used to separate some species from a gas
under pressure according to these species' molecular characteristics
and affinity for an adsorbent material, e.g. active carbon. In several
vessels the following processes take place parallel; the adsorption of
CO2 at high pressure, the pressure change and the regeneration of the
adsorbent material at vacuum.
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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® 
