Optimizing method of air and flue gas system control after desulfurization and denitrification transformation of thermal power generating unit

Abstract

The invention relates to an optimizing method of air and flue gas system control after desulfurization and denitrification transformation of a thermal power generating unit. An oxygen amount allowancecontrol loop after desulfurization and denitrification transformation of the thermal power generating unit and a loop interface, a secondary air valve opening degree allowance control loop after desulfurization and denitrification transformation of the thermal power generating unit and a loop interface, an induced draft fan output allowance control loop after desulfurization and denitrification transformation of the thermal power generating unit and a loop interface as well as a booster fan output allowance control loop after desulfurization and denitrification transformation of the thermal power generating unit and a loop interface are additionally arranged in the control logical configuration of a thermal power generating unit distributed control system (DCS); air blower output interlocking control logic and secondary air valve opening degree interlocking control logic after desulfurization and denitrification transformation of the thermal power generating unit are added in the control logical configuration of the thermal power generating unit DCS; according to the real-time running curve of the control system, related parameters of various control loops for optimization of airand flue gas system control after desulfurization and denitrification transformation of the thermal power generating unit are adjusted online, and the expected control effect is realized finally. Theproblem about automatic air and flue gas system control after desulfurization and denitrification transformation of the thermal power generating unit is solved, the equipment potential is fully played, and the stability of main parameters is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of automatic control of thermal power generating units, and in particular relates to a control optimization method for the wind and smoke system after desulfurization and denitrification transformation of thermal power generating units. It can be used for automatic control of oxygen amount, secondary damper, induced draft fan, and booster fan during the actual operation of thermal power units to ensure that the furnace outlet is automatically oxidized by the distributed control system DCS during the operation of the unit. The material and furnace pressure are controlled within a reasonable range. Background technique [0002] With the increasingly stringent environmental protection requirements, various thermal power companies have carried out energy-saving and emission-reduction transformation and upgrading of coal-fired units, including adding denitrification equipment, canceling the flue gas bypass baffle...

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Problems solved by technology

[0004] The above documents and patents mainly elaborated from the establishment of NOx emission model, the influence of canceling the bypass flue in the desulfurization system of the unit, and a method of electrolytic denitrification, and carried out optimization simulations, and put forward countermeasures that should be taken. However, there is no targeted research on the control of the wind and smoke system after the desulfurization and denitrification transformation of thermal power units

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