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More Environmental Friendly
Traditionally biomass
gasificaton utilizes a Wet Type Gas Purification System which normally
contains scrubber or spray tower using water to directly wash the
producer gas of particulates, tar and at same time cooling the gas. Wet
Gas Purification System requires a large quantity of water, and for
environment, it is a secondary water pollution due to its direct contact
with gas. In addition it will continuously increase the tar particulate
concentration levels in the water if a recirculation process is used.
The pond or cooling tower can also emit vapors of PAHs (Polycyclic
Aromatic Hydrocarbons) and Ammonia. Wet Gas Purification systems
typically also generate large quantities of water that will need
treatment for future reuse and eliminates the opportunity for heat
recovery. Powermax found these conditions to be big barriers for many
installations in various countries so they put their scientists to work
and develop this exclusive Dry Gas Purification System. The first Dry
Type Gas Purification system was successfully run for a 1MW DFGBPP(fuel
rice husk) in China in 2008. After that Powermax Dry Type Gas
Purification System has been widely used with Powermax DFBGPP, CFBGPP,
UFBGPP and TFBGPP all over the world.
Dry Type Gas Purification Delivers Installation Opportunities
With Dry Type Gas
Purification System there is no direct contact with the producer gas
therefor no dirty washing water generation. It eliminates challenges of a
foul smell as there is no process water pond and evaporation cooling
requirements and offers a substantial savings in water otherwise needed
for gas cooling. There is no slug produced with Type Gas Purification
System, eliminated cumbersome sludge handling requirements. Best of all
heat is recovered from hot gas which can be used for drying
applications, heating purpose, or by thermal oil heat exchanger for ORC
to make free electricity.
Producer Gas (Syngas) Quality & Dry Type Gas Purification System Benefits
The Dry Type Gas
Purification System is consistent which allows for a smooth operation of
the gas engine without fluctuations of power.
Both particulates and tar
are removed in a dry form in Powermax's dry type ESP which makes
handling easier. Ammonia is also removed through dissolution in
condensate and only a small quantity (condensate) needs to be treated.
There is also a possibility of recovering ammonium salts, which is a
useful fertilizer, from condensate. And hot air is generated in the Gas
Temperature Control Sub-system during the cooling of the gas which can
also be used for drying of the biomass or send back to gasifier for
increasing the efficiency of gasifier.
“Dry Type Gas
Purification System totally eliminates any adverse environmental impact
as no harmful vapours or particulates are released into the environment.
The systems are extremely user-friendly and have no adverse health
impact on operators or other associated people.”