1000 MW超超临界机组SCR脱硝喷氨控制策略的优化与改进Optimization and Improvement of Ammonia Spray Control Strategy for SCR Denitrification in 1000 MW Ultra-supercritical Unit
刘锋,金晶
LIU Feng,JIN Jing
摘要(Abstract)：
针对某发电厂1 000 MW超超临界机组SCR脱硝喷氨控制系统存在的问题,包括控制对象不准确、测量参数可靠性低、喷氨调节阀特性差、CEMS反吹和标定干扰自动调节等,对不同煤种与脱硝入口NOX浓度关系、磨煤机启停方式对脱硝入口NOX生成的影响进行了分析。采用基于前馈与变参数控制的脱硝控制优化策略,实现了喷氨调节自动控制全程投入,可将系统出口NOX浓度控制在50mg/m3以内且波动较小,SCR脱硝系统控制效果良好。
Aiming at the problems existing in ammonia spray control system for SCR denitrification in 1 000 MW ultra-supercritical unit in a power plant such as inaccurate control object, low reliability of measuring parameters, poor characteristic of ammonia spray control valve, CEMS blow back blow and automatic calibration interference regulation. The relationship between different coal types and NOXconcentration at inlet and the influence of coal pulverizer startup/shutdown mode on NOXgeneration are analyzed. The optimized control strategy of NOXcontrol based on feedforward and variable parameter control is adopted, thus the whole process input of ammonia spray regulation is realized. NOXconcentration can be controlled within 50 mg/m3 with smaller fluctuation. Control effect of SCR denitrification system is favorable.
关键词(KeyWords)：
脱硝;SCR;控制优化;前馈;变参数
denitrification;SCR;optimized control;feedforward;variation parameter
基金项目(Foundation):
作者(Author):
刘锋,金晶
LIU Feng,JIN Jing
DOI: 10.19585/j.zjdl.201803014
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