Automatic control steady-state undisturbed switching method for desulphurization booster fan

Abstract

The invention discloses an automatic control steady-state undisturbed switching method for a desulphurization booster fan. According to the method, a controlled quantity is switched and selected flexibly, and a corresponding set value is tracked and set through an object transmission function; furthermore, the openness of a guide blade of a draught fan is used as a feedforward signal; the parameter optimization proportioning is realized by using a segmental polygonal function; and undisturbed adjustment of a static blade or a movable blade of the booster fan can be well realized by setting a proportion parameter. A unit runs securely and stably by rationally adjusting the controlled quantity and the feedforward signal of the booster fan. Under the secure running of a desulphurization system, the desulphurization efficiency of the unit can be guaranteed; desulphurization is automatically performed, so that the unit can generate power securely and stably; therefore, the labor intensity of an operator is reduced greatly, and the labor efficiency is improved. The method is high in practicability; the engineering is easy to implement; and the automatic control steady-state undisturbed switching method is wide in application prospect.

Description

technical field [0001] The invention relates to a steady-state disturbance-free switching method for automatic control of a desulfurization booster fan, belonging to the technical field of power plant automation. Background technique [0002] Flue gas desulfurization technology is still in the initial stage of development in China, a large number of technologies are imported from abroad, and domestic equipment and technologies are constantly being explored and researched. With the continuous strengthening of national environmental protection efforts, the application scope of flue gas desulfurization equipment has expanded rapidly. Due to the separate design of most desulfurization equipment and the unit, it will inevitably bring about an impact on some parameters of the unit. The desulfurization booster fan is one of the most critical equipment in the desulfurization system. The automatic control of the booster fan is the most important control system for the desulfurization...

AI Technical Summary

Problems solved by technology

This kind of control mediation scheme has a large control deviation dead zone setting, and the controller has less time to participate in the adjustment in static state, resulting in unstable adjustment characteristics of induced draft fan and affecting the quality of automatic adjustment of furnace negative pressure; in dynamic state, it mainly relies on feedforward signal adjustment

[0007] No matter which of the two schemes is selected, there are certain defects. The controlled quantity chooses the inlet pressure of the booster fan to integrate the desulfurization system into the wind and smoke system as a whole; while the controlled quantity chooses the differential pressure before and after the bypass baffle. Only considering the influence of booster fan output on the desulfurization system, the inlet pressure of the booster fan cannot be controlled to be constant, so the influence on the negative pressure of the furnace cannot be eliminated

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