Container
Installation. No Skid required. This Photo
show’s a CHP Container Module with
Standard Gas Cooling / Drying
fully integrated into the overall Biogas
Cogeneration System.
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Advanced Gas Treatment Technologies
Biogenous gases are well suited for
cogeneration. However, the economic
efficiency of the plant operating on
biogas depends on the
gas fuel quality and consistency. It is
important to remove or to reduce unwanted substances
like H2S
(Hydrogen Sulfide), Siloxanes and Methyl
Siloxane Components, NH3
(Ammonia), and excessive Moisture. 2G®
biogas
treatment and monitoring systems are
designed to improve the gas quality by
applying highly cost-effective
technologies.
Advanced cooling / drying &
dehumidification systems, as well as
filter technologies proactively treat the
biogas to produce a high quality fuel.
Our biologists, gas experts, and engineers
continuously study all operational
experiences gathered with thousands of
biogas plants in operation. Our systems
evolved from that know-how, and are designed
to provide plant owners & operators with
the most efficient and cost-effective
solution.
Our experts have the proficiency to
implement the most advanced technology
into our cogeneration power pant
facilities, always considering the actual
gas composition available. This assures
that the
entire gas treatment technology required
is an integral part of our CHP modules.
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Biogas Carbon
Filter System to reduce H2S
Hydrogen
Sulfide |
Biogas Dryer & Cooling System
Dehumidification |
Double H2S
Filter Vessel Configuration |
Outdoor Skid-Mounted Dryer &
Cooling System |
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Biogas H2S
filter systems are used to
reduce the content of
Hydrogen Sulfide in raw
biogas providing a cleaner
and less corrosive gas for
engine combustion.
Regenerated carbon filter
systems are also helping
to reduce certain Siloxane
content. The carbon filter
system is generally more
cost-effective for biogas
CHP applications. The gas
is first dehumidified by
passing it through the
dryer & cooler, and
thereafter to the carbon
filter. The compact
skid-mounted design
minimizes installation
costs and is especially
made for "all weather"
outdoor location.
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Inlet gas is initially
cooled by passing it
through an advanced
counter flow Heat
exchanger, and an air
cooled liquid chiller to
further reduce the gas
temperature. Using the
outlet gas to cool the
inlet gas increases the
system efficiency. A gas
pre-heating system
(thermal after-treatment
technology) elevates the
temperature to ideal
combustion condition.
There is no need for
external hot water to
reheat the Gas. The
compact skid-mounted
design minimizes
installation costs and is
also suitable for "all
weather" outdoor location.
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1 |
Single Siloxane
Filter Vessel |
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2 |
Double H2S Filter
Vessel |
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This Configuration is
typically applied at
Projects with high H2S and
Siloxane Content (e.g.
WWTP Operations).
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1 |
Counter Flow Heat
Exchanger <5°C
/ 41°F |
2
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Gas Pre-Heating 25°C
/ 77°F for optimum
Combustion Condition |
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3 |
Gas Pipe to the
H2S Carbon Filter |
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4 |
Air-cooled Liquid
Chiller Unit |
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5 |
Single H2S Filter
Vessel |
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Alternative Treatment
Measures are available on the Market,...
for Example:
Biological Fixation: A
method where air is ventilated into the
gas.
Disadvantage:
Presence of increased Nitrogen (N 2)
in the biogas results in higher NOx
emissions
when combusted.
Water or Chemical Scrubbing:
Feeding the biogas through a
counter flow of water or chemical
solvents.
Disadvantage:
High cost, extensive water or chemicals
usage, and normally only used in
combination with water scrubbing biogas
upgrading technologies (Bio Methane).
Iron Hydroxide or Oxide Systems:
Biogas is passed through a media composed
of woodchips and iron oxide or hydroxide,
or microalgae cultures.
Disadvantage:
High cost, and the used filter media may
constitute a hazardous waste that is
difficult and expensive to dispose.
Bio Scrubbing: Systems
that use oxygenated effluent as the
reactor medium.
Disadvantage:
High cost, not very effective, usually can
only clean up to result of 200 - 250ppm,
and the sulfur-laden effluent is returned
to the lagoon where it builds up a
hazardous waste problem.
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Gas
Drying & Cooling Technology
Gas drying optimizes the combustion
process in the CHP engine, resulting in an
increased engine efficiency and lower fuel
gas consumption. Reducing the
contamination of engine oil with
condensate will reduce the number of oil
changes required and save costs. Next to
Methyl Cyclo Siloxane components,
particles of Hydrogen Sulfide H2S
and Ammonia NH3
are
also harmful substances that are naturally
partially released along with the
condensate. Given that Ammonia is soluble
in water, NH3
contents
are reduced during the water vapor removal
/ cooling & drying process. Water (high
moisture content) can be one of the most
destructive contaminants for engine
lubricants. It accelerates oil oxidation
and interferes with oil film production.
Hi moisture content should be removed from
biogas to prevent the formation of
“Carbonic Acid”. These acids cause a rapid
drop in the oil's alkalinity (base
number), resulting in an unprotected
corrosive environment and base oil
oxidation. Presence of these acids, if
unnoticed, will accelerate wear and
possibly even corrode critical engine
parts that could result in major unplanned
repairs and downtime.
Biogas at the Digester Outlet
usually has a very high Water Vapor
Content (between 30 to 100g Water per m³
Gas, equal to 1.06 to 3.53 ounce per 35
ft³), depending on the Ambient
Temperature. During Wintertime, at lower
Temperatures, the Water Vapor can easily
condense inside the Gas Pipeline leading
to the CHP. This Condensate in Combination
with H 2S,
CO, and H2,
can cause accelerated Corrosion. Further,
Condensate in the Intake Section
automatically reduces the Engine
Efficiency. It also significantly reduces
the Effectiveness of H2S
Carbon Filter Systems. The Biogas
Treatment Dryer & Cooling
"Dehumidification" System Option is
therefore highly recommended. LFG
(Landfill Gas) also contains high Water
Vapor content. Therefore we certainly
recommend this System also for LFG
Projects.
Especially for LFG (Landfill Gas)
Projects, or WWTP Applications with
relatively low H2S,
but higher Siloxane Contents, we recommend
a single Vessel Siloxane Carbon Filter.
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2G® gas
treatment systems and solutions
provide many advantages. First of all
they are much more cost effective in
direct comparison with all other
alternatives. Since the carbon filter
media is recycled and re-used for
reactivation by the carbon
manufacturers, no additional waste
streams are created. Second, adding
the cost for carbon filter media over
the system life time, the total cost
(including the initial investment) is
generally lower compared to other
alternatives. The H2S and Siloxane
Carbon Filter System is highly
recommended not only to prevent
possible engine corrosion, but also
for the benefit of achieving cleaner
emission values.
P
Fully integrated into the
Biogas CHP Cogeneration System
P Designed to
match the Biogas CHP System
Performance
P All supplied
from one Source with Performance
Guarantee
P Filter Media
to be continuously recycled "No
additional Waste Stream"
P Very
Cost-Effective - Low Investment
P Extends the
CHP Engine Life and reduces
Maintenance Cost
P Reduces
Emissions and the Environmental Impact
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