Reason Analysis and Countermeasure of Boiler MFT Caused by RB of Primary Fan of 1000 MW Unit with Double-Inlet and Double-Outlet Mill
In order to solve the problem that RB of the primary fan of ultra supercritical 1000 MW unit with double-in and double-out mills causes the boiler MFT(main fuel trip),proposes a control strategy that increases static blade regula-tion feedforward of steam driven induced draft fan,optimizes fuel master control logic and increases primary air fan output effort,optimize the strategy of capacity valve control and furnace negative pressure control,and optimize RB control logic of primary fan from suppressing negative pressure drop and stabilizing combustion in the furnace.The test results show that the optimized control strategy can effectively avoid the excessive fluctuation of negative pressure in the furnace during RB test of primary fan,and ensure the safe and stable operation of the unit.It provides a reference for the control logic optimization and operation debugging of the primary fan RB of the same type unit.
RB test of primary air fandouble-inlet and double-outlet ball millfurnace flame failureMFT
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