Flexible peak regulation control method for realizing boiler shutdown without shutdown of CFB (circulating fluid bed) unit

The invention relates to the technical field of unit peak regulation, in particular to a flexible peak regulation control method for achieving boiler shutdown of a CFB unit without shutdown. According to the method, in the flexible peak regulation process, machine, electricity and furnace large chain protection is split, and shutdown during furnace trip protection is prevented; the matching of water supply quantity is realized by keeping a reasonable water-coal ratio; by monitoring the exhaust steam temperature of the high-pressure cylinder and operating the high-exhaust ventilation valve, the safety of the high-pressure cylinder of the steam turbine is ensured; steam-water impact on the low-pressure cylinder of the steam turbine is prevented by controlling the steam inlet superheat degree of the steam turbine, and safe operation of the low-pressure cylinder of the steam turbine is achieved; the induced draft fan, the secondary fan and the primary fan are started in sequence, and coal is fed after the boiler