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Which is the gasifier that can be operated in small scale/amounts?

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Which is the gasifier that can be operated in small scale/amounts?

(a) Counter current gasifier

(b) Cross draught gasifier

(c) Co-current gasifier

(d) Fluidized bed gasifier

This question was posed to me in a national level competition.

Origin of the question is Applications of Biogas & Gasifier in chapter Biomass Energy of Energy Engineering

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Right answer is (b) Cross draught gasifier

For explanation: It is actually the advantage of this system that it is capable of handling very small amounts for operation. Installations below 10 KW can under certain conditions be economically feasible. The reason is the very simple gas cleaning train which can be employed when using this type of gasifier.

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