脱硫系统吸收塔浆液PH值控制与仿真

Desulfurization Absorption Tower Slurry PH Control and Simulation

电站湿式石灰石/石膏脱硫系统中,为保证较高的脱硫效率(95%以上),吸收塔内浆液PH的控制是其中最重要的控制参数之一。目前,电站中广泛采用石灰石浆液PH值为反馈信号,引入锅炉负荷信号和FGD进口SO2含量作为石灰石浆液的前馈信号,进行石灰石浆液给料调节的方法,虽然提高了控制水平,但是由于吸收塔内化学反应过程的强非线性和整个PH值控制过程的大滞后性,很难用解析函数的方法建立整个反应过程的数学模型,使控制没有达到最佳的效果。文中引入CMAC和PID并行控制的控制方式,对石灰石浆液PH值进行了控制仿真,从仿真结果上来看,这种控制方案均取得了较为满意的控制效果。

Power station of limestone / gypsum wet desulphurization system, in order to ensure the high desulfurization efficiency （ more than 95% ）, the absorption tower slurry PH control is one of the most important parameters of control. At present, power is widely used in the limestone slurry pH value of the feedback signal, is introduced into the boiler load signal and FGD import SO2 content as the limestone slurry feedforward signal, At present, power is widely used in the limestone slurry pH value of the feedback signal, is introduced into the boiler load signal and FGD import SO2 content as the limestone slurry feedforward signal, for the limestone slurry feed adjustment method, improve the control level, but due to absorption tower for chemical reaction process of strong non-linearity and the pH control process of the large lag. It is difficult to use the analytic function method to establish the mathematical model of the whole process of the reaction, so that the control does not reach the best effect. This paper introduces CMAC and PID parallel control method of the limestone slurry pH value, the control simulation, from the simulation result, this control scheme achieved a more satisfactory control effect.