Subtopic: Sources of power on the farm – human, animal, mechanical, electrical, wind, solar and biomass
Question Statement:
The type of gasifier which produces nearly tar free producer gas is
Options:
(A) counter current gasifier
(B) co-current gasifier
(C) cross-draught gasifier
(D) fluidized bed gasifier
Official Answer Key:
B
Step-by-Step Solution & Explanation
In a co-current (downdraft) gasifier, air/gasifying agent and biomass move in the same direction; volatile pyrolysis products (tars) are forced to pass through the hot oxidation and reduction zones, where they are thermally cracked, giving nearly tar-free producer gas. A counter-current (updraft) gasifier (A) has the opposite flow and yields the highest tar content since volatiles exit without passing through the hot zone. Cross-draught (C) gives intermediate/variable tar, and fluidized bed (D) gives moderate tar but not the lowest. Hence (B).
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