IN-FURNACE FLOWABILITY CONTROL METHOD FOR FLOWING MEDIUM ACCOMPANYING COAL TYPE SWITCHING IN FLUIDIZED BED BOILER

摘要

PROBLEM TO BE SOLVED: To carry out a quick and proper dealing operation for obtaining stable operation, by making clear a control reference of in-furnace flowability for a flowing medium, when switching the kind of a raw material coal fed into a fluidized bed boiler, and to reduce the load on the operator.;SOLUTION: This in-furnace flowability control method includes a step (S3) for deciding the maximum temperature difference in a fluidized bed, a step (S5) for deciding the average temperature difference in the fluidized bed, and a step for correcting the in-furnace flowability in the fluidized bed to a proper value, based on the decision results of the maximum temperature difference and the average temperature difference in the fluidized bed. The step for correcting the in-furnace flowability in the fluidized bed to the proper value includes a step (S4) for regulating the flow rate of each CWP pump, in response to the maximum temperature difference in the fluidized bed, a step (S6) for regulating the control value of the oxygen concentration in a furnace outlet, in response to the average temperature difference in the fluidized bed, and a step (S7-S12) for regulating the amount of flowing medium in a furnace.;COPYRIGHT: (C)2008,JPO&INPIT