ANALYSIS OF FLUE GAS CHARACTERISTICS AND PROCESS OPTIMIZATION OF CEMENT KILN CO-PROCESSING MUNICIPAL SLUDGE BASED ON ASPEN PLUS
In this study,a simulation model of cement kiln co-processing municipal sludge technology was developed by Aspen Plus.Based on the case that the daily production of clinker was 10000 t/d,the model aimed to analyze the effect of the changes in feed rate and sludge moisture content on flue gas emission law,the calciner's temperature and coal consumption.The results showed that when the moisture content of sludge remained at 60％,and the feed rate of sludge ranged from 1 t/d to 20 t/d,the concentration of NO and SO2 in flue gas changed from 205.5 mg/m3 and 26.5 mg/m3 to 56.7 mg/m3 and 26.8 mg/m3,respectively.When the feed rate of sludge remained at 10 t/d,and the moisture content of sludge ranged from 10％to 90％,the concentration of NO decreased from 136.5 mg/m3 to 133.1 mg/m3 and then increased to 134.6 mg/m3,while the concentration of SO2 decreased from 27.4 mg/m3 to 26.2 mg/m3.50％was the critical moisture content of sludge for the changes in the calciner's temperature and coal consumption.Higher moisture content decreases the temperature and increases consumption,while the opposite is true for lower moisture content.According to simulation results,it is proposed that by maintaining the calciner temperature within the range of 880～905 ℃,the moisture content of sludge can be controlled at 45％-63％,thereby ensuring a sludge feed rate of 20 t/h.The optimized production parameters are proposed to provide a reference for current technology optimization.
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