The reason for excessive clinker formation in gas producers is the

[A].	use of coal/coke containing a high % of fines and ash.
[B].	use of fuel having too low an ash fusion temperature.
[C].	development of hot spots in the fuel bed and an abnormally high rate of gasification.
[D].	all (a), (b) and (c).

Answer: Option D

Explanation:

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