For the hybrid biomass–charcoal gasication, the
lowest tar content found was about 28 mgNm−3.
Primary air supply rate should be high compared
to secondary air supply rate to operate the system
in three-stage conguration. Otherwise, the gasier
operated in two-stage conguration. By supplying
additional air, igniting the charcoal fuel from the bottom
of charcoal hopper, charcoal consumption could
be increased signicantly and it helped to create a local
high temperature zone. Consequently, it increased
the heating value of producer gas and reduced the tar
content of the nal raw gas to some extent.
Almost all of the tar content in producer gas could
be removed by passing it through the spray tower so
that it could safely run a diesel engine without any
tar problems. At the optimal water Jow rate, producer
gas could be cooled down to less than 40◦C.
Engine-generator eCciency at dual fuel operation
was lower than that of diesel fuel operation. With the
experimental system, engine-generator eCciency of
14.7% was achieved at a maximum electrical power
output (11:44 kWe) with 81% of the total energy input
coming from producer gas. Maximum electrical power
output for dual fuel operation was about 79% of that
for diesel fuel operation.
All of the experimental runs on the gasier-engine
system were conducted at a constant speed for different
electrical loads without attempting any adjustment
to producer gas intake valve and air intake valve
to the engine manifold. It is expected that the eC-
ciency of the overall system can be improved through
more detailed study, including modication of the
engine
For the hybrid biomass–charcoal gasication, thelowest tar content found was about 28 mgNm−3.Primary air supply rate should be high comparedto secondary air supply rate to operate the systemin three-stage conguration. Otherwise, the gasieroperated in two-stage conguration. By supplyingadditional air, igniting the charcoal fuel from the bottomof charcoal hopper, charcoal consumption couldbe increased signicantly and it helped to create a localhigh temperature zone. Consequently, it increasedthe heating value of producer gas and reduced the tarcontent of the nal raw gas to some extent.Almost all of the tar content in producer gas couldbe removed by passing it through the spray tower sothat it could safely run a diesel engine without anytar problems. At the optimal water Jow rate, producergas could be cooled down to less than 40◦C.Engine-generator eCciency at dual fuel operationwas lower than that of diesel fuel operation. With theexperimental system, engine-generator eCciency of14.7% was achieved at a maximum electrical poweroutput (11:44 kWe) with 81% of the total energy inputcoming from producer gas. Maximum electrical poweroutput for dual fuel operation was about 79% of thatfor diesel fuel operation.All of the experimental runs on the gasier-enginesystem were conducted at a constant speed for differentelectrical loads without attempting any adjustmentto producer gas intake valve and air intake valveto the engine manifold. It is expected that the eC-ciency of the overall system can be improved throughmore detailed study, including modication of theengine
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