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Which gasifier has a minimum tar converting capability?

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Which gasifier has a minimum tar converting capability?

(a) Counter current gasifier

(b) Cross draught gasifier

(c) Co-current gasifier

(d) Fluidized bed gasifier

This question was addressed to me in an interview for job.

The query is from Applications of Biogas & Gasifier topic in chapter Biomass Energy of Energy Engineering

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Correct choice is (b) Cross draught gasifier

The best I can explain: A disadvantage of cross draught gasifiers is their minimal tar converting capacity and the consequent needs for the high quality charcoal. It is because of the uncertainty of charcoal quality that a number of charcoal gasifiers employ down draught principle, in order to maintain at least a minimal tar cracking capability.

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