基于脱硝过程模型的分区喷氨控制系统仿真研究

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DOI：10.19981/j.CN23-1581/G3.2026.12.011

中图分类号：TM621

文献标志码：A

文章编号：2095-2945（2026）12-0041-04

Abstract： Aiming at the problems of uneven distribution of outlet nitrogen oxides （ NOx ） and excessive local ammonia slip in the selective catalytic reduction（SCR） denitrification system during deep peak shaving of coal-fired units， this paper constructs an SCR transfer function model with time delay and second-order inertia characteristics. Based on a multi-loop independent PID control algorithm， a closed loop control system for zonal ammonia injection is designed. Through simulation verification， the fluctuation of NOx concentration at the outlet of each zone is stable at 35～45 mg/Nm 3 ， and the deviation from the set value of 40 mg/Nm 3 is controllable; the NOx distribution unevenness indicator continues to be below 20%， meeting industrial control requirements. The research results provide theoretical support and simulation method reference for the optimization of denitrification systems in the flexible transformation of coal-fired units.

Keywords： SCR denitrification; zonal ammonia injection control; multi-loop PID control; transfer function model; nitrogen oxide uniformity

“双碳”目标提出以来，清洁能源发电的装机容量占我国总装机容量的比例越来越高，截至2023年底，我国清洁能源装机容量达 12.5×108 kW，占总装机容量的45.8%，预计2035—2040年，风电、光伏发电量将超过煤电。（剩余3721字）