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In one plant id fan and fd fan are used for boiler. boiler is used to heat water after some days they install one tank to heat water by hot flue gases coming out from boiler and then hot flue gases are used to heat the air coming from fd fan before leaving out from chimney . but hot flue gases are not coming out from id fan what might be the reason?
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Answer Posted / mayur mukaty
APH outer air is not more than 140 c and less than 130 c because of Sulphur due point.if APH efficiency goes down due to Soots deposit APH boiler outlet temp goes Increase on other side failure of Design or High CV fual feed to boiler also raised outlet temp. So that management decide for Recover heat by Heating of feed water that is thumb rule when you increase 3 c of feed water temp 1% increase Boiler efficiency. When you calculate Money terms you save lots of money
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