It is very important to realize that the shut-off gate of the dry-type slag extractor at the bottom of the boiler of coal-fired power station can be stopped in any positions to improve its security and economy.A new method based on distributed control system(DCS)software configuration is proposed in this paper,to realize the arbitrary stop of the shut-off gate in the hydraulic system by flexibly controlling the power acquisition time of the shut-off gate solenoid valve,which reduces the ingress of external cold air,optimizes the operation mode,and realizes the fine operation and real-time adjustment of the cooling air volume according to the slag situation.The field application has been carried out on two 350 MW ultra-supercritical units in a power plant,and the results verified its advantages of security and economy and improved slag efficiency,which not only reduced the system operation and maintenance cost,but also reduced the coal consumption of power supply by 0.984 g/(kWh),and has high practical value for the slag removal system of air-cooled steel belt conveyors.
维普
万方数据