烟气脱硫吸收塔pH值控制策略优化研究

文章首先介绍现有用于烟气脱硫吸收塔pH值控制的两种基本控制策略,包括单回路前馈反馈控制系统和串级前馈反馈系统。并对现有两种控制策略下烟气脱硫系统吸收塔运行过程中浆液pH值响应过程的分析,针对现有脱硫系统pH值控制策略导致响应滞后等一系列问题,提出了改善烟气脱硫pH值控制策略和响应特性的措施方案,并提出了相应的控制策略,结合烟气脱硫吸收塔浆液池的对象模型,通过对控制策略的仿真,得到该控制策略下的对象的响应特性,验证了控制策略的可行性。最终,将优化的控制策略用于工程实践,结合工程实例说明了通过pH控制策略优化可达到pH值响应更为及时,pH值波动范围减少的效果。从而保证脱硫装置的安全稳定高效运行,有效降低运行消耗。

Optimization for pH Value Control of Flue Gas Desulphurization Tower

Two kinds of control strategies of flue gas desulphurization(FGD) pH value controlling were introduced,including single-loop feedforward-feedback controller and cascade feedforward-feedback controller.According to the analysis of the pH response process in the slurry pond of flue gas desulphurization tower,the pH response lag was obtained.Using the traditional control strategies can cause several problems.And the solution to improving the pH control strategy was generated.By the simulation of the optimized control strategy,the response characteristics of the absorber can be generated and the control strategy is feasible.In the engineering case,the optimized control system was used to improve the response time and amplitude of pH value.The safe,efficient and stable operation of FGD system can be ensured.