Question

Which gasifier has better tar converting capacity?

(a) Counter current gasifier

(b) Cross draught gasifier

(c) Co-current gasifier

(d) Fluidized bed gasifier

I have been asked this question in final exam.

The above asked question is from Applications of Biogas & Gasifier topic in division Biomass Energy of Energy Engineering

Answer 1

The correct answer is (c) Co-current gasifier

To elaborate: A solution to the problem of tar entrainment in the gas stream has been found by designing co-current or down draught gasifiers, in which primary gasification air is introduced at or above the oxidation zone in the gasifier.