
2011年第11期(总第167期)
应用能源技术
脱硫系统吸收塔浆液PH值控制与仿真
陈耀龙
(国核电力规划设计研究院,北京100094)
摘要:电站湿式石灰石/石青脱硫系统中,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FCD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采。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。
关键词:PH值;小脑神经网络(CMAC);PID;脱硫系统;仿真
中图分类号:TP273.22
文献标志码:B
文章编号:1009-3230(2011)11-0021-05
Desulfurization AbsorptionTower SlurryPHControlandSimulation
CHEN Yao-long
(ChinaNuclearPowerPlanningandDesignInstitute,Beijing100094,China
Abstract: 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 slury 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.
Key words:PH;CMAC; PID;Desulfurization system; Simulation
湿式石灰石/石膏烟气脱硫技术 1
1.1系统流程
湿式石灰石/石膏烟气脱硫工艺流程见图1。一般的FGD(FlueGasDesulfurization)系统主要由以下的系统构成:a烟气系统,包括烟气回路、净收稿日期:2011-09-18
修订日期:2011-10-10
作者简介:陈埋龙(1976-),男,内蒙古包头人,硕士,热工
工程自动化。
万方数据
21
烟气再热器、增压风机等;b.石灰石预备系统,包括石灰石湿磨机,石灰石仓;c.吸收塔系统,包括石灰石浆液,石膏旋流器,除雾器,氧化风机;d.石膏脱水系统,包括真空皮带脱水机,石膏仓;e.工艺水系统;f.排放系统;g.电气系统。脱硫塔内有三个功能区,即除雾区、吸收反应区(生成亚硫酸钙)、脱硫产物氧化区(生成硫酸钙)。除雾区将烟气与洗涤浆液滴及灰分分离,吸收SO,后生成的亚硫酸钙在氧化区进一步被送入塔内的空气氧