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针对黒液蒸发工段的工艺和控制要求,设计了基于S7-300 PLC的黒液蒸发工段过程控制系统,从硬件配置和软件设计上进行详细的介绍,综合应用了变频器、电机泵、气动阀等设备,且对液位和黒液浓度控制提出了行之有效的控制算法,如选择性控制、串级控制等。该系统具有高稳定性与快速动态响应特性,即实现了蒸发过程的平稳和黒液浓度的精确控制,又具有很高的可靠性和安全性,在实际应用中取得了很好的效果。
According to the process and control requirements of Black Liquor Evaporation section, the process control system of Black Liquor Evaporation section based on S7-300 PLC is designed. The hardware configuration and software design are introduced in detail. The application of inverter, motor pump, pneumatic valve And other equipment, and the liquid level and black liquor concentration control put forward effective control algorithms, such as selective control, cascade control. The system has high stability and fast dynamic response characteristics, that is, to achieve a smooth evaporation process and the precise control of the concentration of black liquid, but also with high reliability and safety, and achieved good results in practical applications.