What is the most likely cause of black smoke at the boiler exhaust during the normal operation of a steam boiler?

11 Oct '20, 19:52

Oct. 11, 2020, 7:52 p.m.
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Answer:

The cause is an insufficient amount of combustion air which leads to incomplete combustion of the fuel in the furnace.

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11 Oct '20, 19:54

Oct. 11, 2020, 7:54 p.m.
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