适应新型电力系统的火电机组脱硝系统控制策略优化研究

Control Strategy Optimization for Thermal Power Unit Denitration System Adapted to New Power System

针对机组快速变负荷运行引起燃烧扰动,风煤配比频繁波动,导致锅炉烟气中NOx质量浓度大幅变化的问题,开展适应新型电力系统运行的火电机组脱硝系统控制策略优化。首先,对机组原有逻辑存在的问题进行分析;然后,结合脱硝系统实际运行参数和运行人员调整经验,制定适应新型电力系统的智能脱硝控制策略,从而实现了净烟气出口NOx排放质量浓度实时值均达标,并保证净烟气出口NOx质量浓度波动幅度降低,提高脱硝系统运行的稳定性,最大限度发挥脱硝系统潜力,提高机组自动控制水平,提升调节品质,改善系统对外界的响应性能。

The rapid load change operation of the unit brings com bustion disturbances,frequent fluctuations in the wind coal ratio,and significant changes in the NOx mass concentration in the boiler flue gas.Therefore,optimization of the control strategy for the denitrification system of thermal power units adapted to the operation of the new power system should be carried out.This article analyzes the problems existing in the original logic of the unit,and based on the actual operating parameters of the denitrification system and the experience of operating personnel adjus tment,develops an intelligent denitrification control strategy suitable for the new power system.Real time values of NOx emission quality concentration at the outlet of the clean flue gas have been achieved to meet the standard,and the fluctuation range of NOr quality concentration at the outlet of the clean flue gas has been reduced,improving the stability of the denitrification system operation,ma ximizing the potential of the denitrification system,improving the automatic control level of the unit,enhancing the regulation quality,and improving the system's response performance to the outside world.