The desulfurization waste liquid generated from the desulfurization system is normally delivered to coal preparation system for coal blending.To this end,an additional waste liquid evaporator is added,which could reduce 8.99 m3/d of desulfurizing waste liquid to be blended with so as to produce comprehensive economic benefit about 258 yuan/d.In addition,the moisture content of the blended coal is reduced so that not only the amount of coal water and the biochemical sewage treatment load can be minimized,but also normal operation of coke oven can be ensured.