Boiler control providing improved operation with fuels...

Details Boiler control providing improved operation with fuels... Boiler control providing improved operation with fuels...

F - Mech Eng,Light,Heat,Weapons

01

K

110/26, 122/27

F01K 13/00 (2006.01) F23N 1/08 (2006.01) F23N 5/18 (2006.01)

Patent

CA 1079139

BOILER CONTROL PROVIDING IMPROVED OPERATION WITH FUELS HAVING VARIABLE HEATING VALUES ABSTRACT OF THE DISCLOSURE A boiler control regulates the input fuel and air to satisfy load demand. Simultaneously, the air flow is adjusted by an air flow control to correct for changes in fuel heating value by means of a circuit which operates in response to outlet steam flow and input mass fuel flow to determine the difference in presumed heat input and actual heat output and, by inference from the heat imbalance or error, a change in fuel heating value. The heat error is used to adjust the air flow demand to the air flow control. In another embodiment, boiler heat pickup is derived to remove from the heat imbalance any heat input changes other than fuel heating value changes.

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