火电机组FCB炉膛压力控制系统的优化

Optimization of Thermal Power Furnace Pressure Control System Based on FCB

为研究火电机组FCB过程锅炉炉膛负压控制技术,利用机理方法建立锅炉负压数学模型,分析了常规工况炉膛压力控制方式,提出在FCB过程中,炉膛压力控制系统引入煤量作为静态补偿的控制方式;并对所提出的炉膛压力控制方式与常规的炉膛压力控制方式进行了仿真试验.仿真结果表明:在FCB过程中,炉膛压力控制系统引入煤量作为静态补偿可有效减小炉膛负压波动;对FCB过程炉膛压力控制系统所加的煤量静态补偿给予适当的增益可有效的减小FCB过程中炉膛负压下降的最低值.按照此种控制方式对炉膛压力控制系统进行优化,正常工况采用常规控制方式,FCB工况采用此控制方式,可有效减小FCB过程中炉膛压力波动,可有效减小FCB过程炉膛负压下降最低值,利于FCB过程炉内燃烧稳定.

A mathematical model of boiler negative pressure utilizing mechanism was established to study boiler furnace pressure control technology in the process of thermal power FCB,which analyzed the conditions of conventional furnace pressure control,put forward the control method introducing the amount of coal as a static compensation in the furnace pressure control system in the process of FCB,and made simulations of furnace pressure control mode and conventional furnace pressure control.Simulation results show that:Coal is introduced to the furnace pressure control system as a static compensator,which can reduce the fluctuation of furnace pressure effectively;Giving an appropriate gain to coal static compensator for furnace pressure control system can reduce the minimum drop value of furnace pressure in the process of FCB effectively.In accordance with such control method to optimize furnace pressure control system,by the other words,using conventional control method in normal condition,and using this control method in FCB conditions,which can reduce fluctuation of furnace pressure in the process of FCB and the minimum drop value of furnace pressure effectively,even is good for stability of combustion in the process of FCB.