Denitration ammonia spraying flow adjusting device based on cascade PID (proportion integration differentiation) and feedforward and working method of device

A working method and ammonia flow technology, applied in separation methods, chemical instruments and methods, and controllers with specific characteristics, etc., can solve problems such as easy oscillation and divergence of the concentration at the chimney inlet, shaking of the ammonia injection regulating valve, and difficulty in stable control, etc. , to achieve the effect of maintaining stable NOx concentration at the chimney inlet, reducing control overshoot, and overcoming control problems
CN109092035APending Publication Date: 2018-12-28HUADIAN ELECTRIC POWER SCI INST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUADIAN ELECTRIC POWER SCI INST CO LTD
Publication Date
2018-12-28

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Abstract

The invention relates to a denitration ammonia spraying flow adjusting device based on cascade PID (proportion integration differentiation) and feedforward and a working method of the device. Existingdenitration ammonia spraying automatic control logic cannot stably control the concentration of NOx at an outlet of an SCR (selective catalytic reduction) reactor, and the labor intensity of operators is increased. The device comprises the SCR reactor, an electric control valve, a flowmeter and the like, wherein the SCR reactor is arranged between a boiler economizer and an air preheater; an inlet of the SCR reactor is adjacent to the boiler economizer, and an outlet of the CR reactor is adjacent to the air preheater; a No.1 ammonia spraying grille, a guide plate, a No.2 ammonia spraying grille and a catalyst layer are sequentially arranged in the flow direction of flue gas, the No.1 ammonia spraying grille is adjacent to the inlet of the SCR reactor, and the No.2 ammonia spraying grilleis adjacent to the catalyst layer. By means of the device, the control problem caused by the large delay characteristic of a denitration system can be solved, control overshoot can be reduced, and accurate control of the ammonia spraying amount can be realized.
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Description

technical field

[0001] The invention relates to a device and a working method for adjusting the denitrification and spraying ammonia flow based on cascade PID plus feedforward, and belongs to the field of thermal automatic control. Background technique

[0002] Under the current background of large-scale grid-connection of new energy sources in the power industry, thermal power units frequently participate in peak regulation, and the depth of peak regulation is increasing. Therefore, the operating condition of the boiler changes frequently in a wide range, resulting in frequent changes of the flue gas parameters at the furnace outlet, including the SCR denitrification inlet NO x Concentrations vary drastically. Selective Catalytic Reduction flue gas denitrification method (Selective Catalytic Reduction), referred to as SCR, is currently the most widely used denitrification method in thermal power plants. The principle of SCR denitrification is to use NH under the action of...

Claims

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