Design and Test of Desulfurization Control Unit of Slurry for Coal-Fired Power Plant: An Experimental Study

A novel desulfurization control unit of coal slurry was developed for power plant to meet the environmental requirements on SO₂ emission.First, the control scheme was designed, based on the calculation in theory of distributed control system (DSC) and on data acquired in algorithm of continuous emission monitoring system (CEMD), and the cascade PID controllers regulated the flow-rate of slurry and SO₂ emission;second, the pre-control coefficient was increased to intervene PID regulation;and finally, the unit-load and SO₂ concentration served as the feed forward control signals to precisely adjust the coal-slurry flow-rate in real time.The newly-developed desulfurization control unit, installed in the coal-fired plant, has been continuously working pretty well since July, 2018.The results show that the novel control unit does an excellent job.We suggest that the new desulfurization control scheme be of some technological interest in burning of high sulfur coal.