基于STM32的脱硫除尘工艺水酸碱度控制研究

Control on Process Water pH Value of Desulphurization and Dust Removal Based on STM32

在石灰石-石膏湿法烟气脱硫技术中,吸收塔工艺水(循环浆液)的酸碱度(pH值)控制是通过人工调节石灰石浆液流量来控制.针对这种控制工艺水pH值的缺陷,设计了一种基于STM32控制器的脱硫除尘工艺水pH值自动控制方案.首先分析了石灰石浆液流量与吸收塔循环浆液pH值的大小关系,提出了pH值控制方案.然后设计了整个pH值控制系统的硬件方案,选定了控制芯片STM32F103RCT6和开发板,又基于Keil MDK和ST固件函数库对控制系统进行程序设计.最后采用了一套模拟酸碱中和反应过程的试验装置,验证该脱硫除尘工艺水酸碱度控制系统.基于STM32F103RCT6控制的pH值控制系统能够很好地维持吸收塔浆液pH值稳定,且自动化程度高,对石灰石-石膏湿法烟气脱硫系统有着重要的研究价值.

In the technical process of limestone-gypsum wet flue gas desulphurization（WFGD） technology,the slurry pH value in absorber tower was controlled through manual adjustment of the flow rate of limestone slurry.On account of the defect of slurry pH value control, the automatic control project of process water pH value of desulphurization and dust removal based on STM32 was designed in this paper.Starting from limestone-gypsum wet flue gas desulphurization technical process,the relationship between the flow rate of limestone slurry and recirculation slurry pH value in absorber tower was emphatically analyzed,meanwhile,the pH value control plan was proposed.In the flowing, this paper presented the hardware solution of entire pH value control system,including the control chip （STM32F103RCT6） and development board. After that, the entire program of control system was developed based on Keil MDK and ST firmware library.Finally,a set of simulated test of acid-base neutralization reaction device was adopted to verify the control project of process water pH value of desulphurization and dust removal. This system can maintain slurry pH value in absorber tower stability well, which demonstrates higher level of automation,has great research value to the limestone-gypsum wet flue gas desulphurization system.