Feed pump rb control system and method for supercritical cfb boiler generator set

Abstract

The invention relates to the technical field of circulating fluid bed boilers, and discloses a water feeding pump RB control system and method of a supercritical CFB boiler generator set. The control system is respectively connected with a water feeding system and a boiler system, wherein the control system comprises an acquiring device and a control device; the acquiring device is used for acquiring tripping signals of various water feeding pumps in the water feeding system; the control device is used for comparing load of a current unit of the generator set with a first set value under the condition that at least one tripping signal is acquired, and controlling a boiler master controller of the boiler system to be switched into a manual running mode under the condition that the load of the current unit is greater than the first set value, so that the boiler master controller adjusts the amount of fuel fed into a boiler according to RB speed of a water feeding pump until the amount of the fuel corresponds to an RB target value. By the water feeding pump RB control system of the supercritical CFB boiler generator set, load of the water feeding pump can be reduced rapidly during tripping of the water feeding pump.

Description

technical field [0001] The present invention relates to the technical field of CFB (Circulating Fluidized Bed, Circulating Fluidized Bed) boilers, in particular, to a feed pump RB (Runback, auxiliary machine failure load shedding) control system and method for a supercritical CFB boiler generator set. Background technique [0002] RB means that when the main auxiliary machine in the generator set fails and trips, so that the maximum output of the generator set is lower than the given load, the unit coordination control system (Control Coordination System, CCS) will quickly reduce the unit load to the corresponding output that can actually be achieved. And control the unit to continue running within the allowable parameter range. [0003] The main steam and main water supply system in the supercritical CFB boiler generator set adopts the unit system. The unit is equipped with 2×50% steam pump set + 30% electric pump set water supply system. The two steam pumps in normal opera...

AI Technical Summary

Problems solved by technology

When the generator set is running at high load, a feed water pump suddenly trips, and the feed water flow rate is halved step by step, while a large amount of high-temperature bed material in the CFB boiler continues to release heat, resulting in an imbalance of the coal-water ratio, which can easily cause the heating surface of the boiler to overheat , unable to control the stable operation of the generator set within the allowable parameter range, if the effective rapid load reduction cannot be realized correctly, it will cause the generator set to trip, resulting in serious economic losses

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