Quick control method of negative pressure of hearth during primary air fan RB process of supercritical once-through boiler

Abstract

The invention discloses a quick control method of the negative pressure of a hearth during the primary air fan RB process of a supercritical once-through boiler. The quick control method is used for controlling induced draft fans and a booster fan when an RB command is given, which is caused by the fact that one of two primary air fans in a system trips due to failure. Under different operation conditions and different loads, induced draft fan baffle commands and booster fan baffle commands are given when the primary air fan RB of the supercritical once-through boiler happens, so as to avoid the severe disturbance of the negative pressure of the hearth during the RB process, the control problem of the negative pressure of the hearth during the primary air fan RB process is solved, the negative pressure of the hearth can be quickly stabilized within the appropriate range after the primary air fan on one side trips, and disturbing again, which is caused by feedforward signal variation, is avoided during the RB process and after the RB is ended.

Description

technical field [0001] The invention belongs to the technical field of industrial process control, and in particular relates to a fast control method for furnace negative pressure in the RB process of a primary fan of a supercritical once-through boiler. Background technique [0002] With the country's economic development and continuous emphasis on environmental protection, flue gas desulfurization systems have been widely used in the construction and production of supercritical once-through boilers. [0003] The resistance of the desulfurization system is mainly composed of four parts: absorption tower, flue gas heat exchanger, demister and flue resistance. The inlet guide vane of the induced draft fan and the inlet guide vane of the booster fan are the key equipment related to the unit and the desulfurization system. Research on the desulfurization system supporting some supercritical 600MW thermal power units in China. Under the full load condition of the boiler, the re...

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Problems solved by technology

[0006] The purpose of the present invention is to propose a fast control method for the furnace negative pressure in the primary fan RB process of a supercritical once-through boiler, which solves the problem that the furnace negative pressure is difficult to control when the primary fan RB occurs in this type of unit, and at the same time ensures that it is in the RB process and The negative pressure of the furnace is always stable after the end of RB

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