A control method of scr denitrification system based on sensitive factor analysis

Abstract

The invention discloses a control method of an SCR denitrification system based on the analysis of sensitive factors, comprising the following steps: 1) collecting historical parameter samples of the operation of the SCR denitrification system at fixed time intervals, and calculating the influence of each operating parameter on the NOx at the inlet of the denitrification reactor at different times Sensitivity coefficient, then draw the sensitivity curve of each operating parameter and denitrification reactor inlet NOx according to the obtained sensitivity coefficient; 3) Calculate the predicted value of NOx at the inlet of the denitrification reactor according to several main sensitive factors affecting NOx at the inlet of the denitrification reactor; 4) The predicted value of NOx at the inlet of the denitrification reactor according to step 3) adopts a cascade PID control system Control the ammonia injection volume of the SCR denitrification system to realize the control of the SCR denitrification system. The invention can control the amount of ammonia injection in the SCR denitrification system in real time, quickly and effectively.

Description

technical field [0001] The invention belongs to the technical field of automatic control of an SCR denitrification system, and relates to a control method of an SCR denitrification system based on sensitive factor analysis. Background technique [0002] The SCR denitrification technology converts NOx into nitrogen and water through the reducing agent ammonia at an appropriate temperature and in the presence of a catalyst. Due to the mature SCR denitrification technology, less impact on boiler operation, no by-products, and high denitrification efficiency, it is widely used in China. It has been widely used in power plant denitrification projects. [0003] During the operation of the SCR denitrification system, the NOx at the reactor outlet is required to be stable for a long time to meet the environmental protection requirements. Therefore, there is a high requirement for the amount of reducing agent ammonia injected into the reactor. If the injection amount is too small, th...

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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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