SNCR and scr pollutant removal synergistic control method and system

By setting the ammonia concentration values ​​at the SCR outlet and inlet and the coefficients K1 and K2, and rationally allocating the reductant flow rates of SNCR and SCR, the problems of unreasonable tasks and high ammonia slip caused by independent control were solved, thereby improving the reductant utilization rate and stabilizing pollutant emissions.

CN117531354BActive Publication Date: 2026-07-21EVERBRIGHT ENVIRONMENTAL PROTECTION TECHNOLOGY EQUIPMENT (CHANGZHOU) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
EVERBRIGHT ENVIRONMENTAL PROTECTION TECHNOLOGY EQUIPMENT (CHANGZHOU) CO LTD
Filing Date
2023-12-05
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

The existing independent control of SNCR and SCR leads to unreasonable allocation of NOx removal tasks, high ammonia slip, low reductant utilization rate, and large fluctuations in pollutants at the flue gas system outlet.

Method used

By setting the set values ​​for NOx at the SCR outlet, ammonia slip, and ammonia concentration at the inlet, and combining them with coefficients K1 and K2, the reductant flow rates of SNCR and SCR are rationally allocated, and the amount of reductant injected is controlled collaboratively by the data acquisition and processing module.

Benefits of technology

This achieved a reasonable allocation of NOx removal tasks, reduced over-spraying of reducing agents and ammonia escape, improved the utilization rate of reducing agents, and stabilized pollutant emissions.

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Abstract

The present application belongs to the technical field of flue gas nitrogen oxide treatment, and particularly relates to a SNCR and SCR pollutant removal collaborative control method and system. The SNCR and SCR pollutant removal collaborative control method reasonably assigns the NOx removal task to the subsequent SCR, reduces the injection amount of the SNCR reducing agent, can solve the problem of over-injection of the SNCR reducing agent, can improve the reducing agent utilization rate and reduce ammonia escape; separately controls the ammonia escape and NOx at the SCR outlet, avoids excessive injection of the reducing agent for the purpose of controlling NOx, and can reduce ammonia escape; and uses the ammonia concentration at the SCR inlet to distinguish the removal tasks of the SNCR and the SCR, can reasonably assign the removal tasks of the SNCR and the SCR, and achieves the technical effect of stable pollutant emission.
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