基于PLC和Intouch的次氯酸钠加氯系统设计

Design of sodium hypochlorite chlorination system based on PLC and Intouch

在100万m^(3)/d的澄西水源厂原有的液氯工艺上实施次氯酸钠自动控制系统改造,改造工程包括:基于负引流发生罐、次氯酸钠浓液池、次氯酸钠稀释池、管路等组成的次氯酸钠稀释系统;基于隔膜泵、流量仪、投加点管路组成的次氯酸钠投加系统;基于工业自动化组态软件Intouch的PC机、现场PLC、变频器、现场总线等组成的电控系统。改造后数据表明,现场制备的次氯酸钠作为消毒剂在没有明显单位耗用增多下,能够满足饮用水厂对消毒的要求。同时,实现了加氯过程的自动化与精确化,保证了水厂的安全生产,降低了人员的劳动强度。

Wuxi Water Group Co.,Ltd.carried out the research of disinfection technology,and carried out the transformation of sodium hypochlorite automatic control system on the original liquid chlorine process of Chengxi water source plant of 100×10^(4)m^(3)/d.The renovation project includes three parts:sodium hypochlorite dilution system based on negative drainage tank,sodium hypochlorite concentrated liquid tank,sodium hypochlorite dilution tank and pipeline,sodium hypochlorite dosing system based on diaphragm pump,flow meter and pipeline of dosing point,PC based on industrial automation configuration software Intouch,on-site PLC,and alteration.Electronic control system composed of frequency converter and field bus.The modified measurement and operation data show that the sodium hypochlorite prepared on site as a disinfectant can meet the disinfection requirements of drinking water plants without obvious increase in unit consumption.More importantly,the automation and precision of chlorination process have been realized,which ensures the safe production of waterworks and reduces the labor intensity of personnel.