CONTROL METHOD AND APPARATUS FOR CONTROLLING FLOW RATE OF MILL PRIMARY AIR FOR PULVERIZED COAL FIRED BOILER

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for controlling a mill primary air flow rate of a pulverized coal fired boiler in which coal shipping characteristics of a mill upon a change in a load are improved. ;SOLUTION: An opening adjustment instruction 18 is outputted from a controller 14 to a primary air flow rate adjustment damper 12 such that a primary air flow rate 10 detected with a primary air flow rate detector 11 becomes equal to a primary air flow rate instruction 13 estimated on the basis of a load instruction. Further, upon a change in a load, the primary air flow rate instruction 13 is varied by a predetermined amount in response to a load changing rate 20.;COPYRIGHT: (C)1999,JPO