Control method for SCR denitration system based on sensitive factor analysis

Abstract

The invention discloses a control method for an SCR denitration system based on sensitive factor analysis, comprising steps of 1) collecting the history parameter sample of the SCR denitration system operation at the fixed time interval, calculating the sensitive coefficients of various operation parameters which affect the denitration reactor inlet NOx at different moments, drawing the sensitivity curves of the various operation parameters and the reactor inlet NOx according to the obtained sensitive coefficient, 2) determining a plurality of main sensitive factors that affect the denitration reactor inlet NOx according to the drawn denitration reactor sensitivity curve of the step 1, 3) calculating the prediction value of the reactor inlet NOX of the denitration reactor inlet NOx according to the plurality of main sensitive factors that affect the denitration reactor inlet NOx, and 4) adopting a cascade PID control system to control the ammonia spray amount of the SCR denitration system according to the obtained prediction value of the denitration reactor inlet NOx to realize the control on the SCR denitration system. The method can perform real time, fast and affective control on the ammonia spray amount in the SCR denitration system.

Description

Technical field [0001] The invention belongs to the technical field of automatic control of an SCR denitration system, and relates to a control method of an SCR denitration system based on analysis of sensitive factors. Background technique [0002] SCR denitrification technology uses the reducing agent ammonia to convert NOx into nitrogen and water under the conditions of appropriate temperature and the presence of a catalyst. Due to the mature SCR denitrification technology, it has less impact on boiler operation, no by-products, and high denitrification efficiency. It has been widely used in power plant denitration projects. [0003] During the operation of the SCR denitrification system, the reactor outlet NOx is required to meet environmental protection requirements stably for a long time. Therefore, there is a higher requirement for the amount of reducing agent ammonia injected into the reactor. Too little injection will cause the reactor outlet NOx to exceed the environmenta...

AI Technical Summary

Problems solved by technology

In view of the characteristics of the SCR denitrification system, simply using the traditional PID control, relying only on the measured data of reactor outlet and inlet NOx, flue gas volume and ammonia injection volume, etc. can no longer achieve a satisfactory control effect.

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