Implementation of blast furnace gas water spray cooling control system based on PLC and OPC

An automatic control system based on PLC was designed according to big flow, high temperature and maximum cooling temperature 55°C of the blast furnace gas. To realize closed-loop control of temperature, the system collected inlet and outlet gas temperature using temperature sensors. According to the change in temperature, PLC automatically changed the working water spray capacity by regulating the output frequency of frequency converter automatically. Considering the big noise and long distance from monitoring room, a remote control system was designed to help operators in DCS control room monitor and operate the water cooling equipment. The system enhances the automation of water spray cooling system, and it has great practical and spreading values.