SCR system automatic control method based on ammonia spraying sensitive valve locking
A technology of SCR system and sensitive valve, which is applied in the field of air pollutant control of coal-fired boilers, can solve the problems of increased ammonia escape, high ammonia injection volume, and large hysteresis, so as to improve reaction efficiency, save ammonia consumption, and reduce ammonia escape. Effect
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[0051] The present invention will be described in detail below with reference to the accompanying drawings. This embodiment case is implemented on the premise of this technical solution. It should be understood that the embodiment case is to illustrate the present invention, but the protection scope of the present invention is not limited to the described embodiment case.
[0052] This implementation case is aimed at a 660MW coal-fired unit for the SCR system AIG automatic control development. The SCR ammonia injection system consists of 1 main valve, 2 main automatic control valves, 48 ammonia injection branch valves (24 on each side), etc. The components cooperate to control the amount of ammonia injection. The following takes the AIG automatic control development on the A side of the SCR system as an example to describe, the specific implementation steps are as follows:
[0053] 1. All-round analysis of the operating characteristics of the SCR system under variable load condit...
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