燃煤型密集烤房污染物排放及脱硫除尘研究

Study on pollutant emission and desulphurization and dust removal of coal-burning bulk curing barn

【目的】为解决燃煤型密集烤房烘烤过程中SO_(2)、烟尘排放不达标等问题。【方法】在福建、贵州、云南、河南以及湖北五个省设置试验点开展了燃煤密集烤房主要污染物减排技术研究。【结果】普通燃煤密集烤房加煤类型及方式对污染物排放影响较大,SO_(2)、烟尘、CO平均排放浓度分别为658.96 mg/m^(3)、65.52 mg/m^(3)、3243.12 mg/m^(3);烤房烟囱安装湿法脱硫设备SO_(2)排放降低72%~92%,烟尘排放降低75%~92%;安装加煤机自动进煤污染物排放降低40%以上,热效率提高24.91%,煤耗降低16.75%,烘烤成本降低28.85%;湿法脱硫设备及自动加煤机联合使用脱硫效率稳定在85%左右,除尘效率稳定在95%左右。【结论】燃煤密集烤房安装湿法脱硫设备及自动加煤机可实现高效脱硫除尘,SO_(2)排放浓度低于30 mg/m^(3),烟尘排放浓度低于15 mg/m^(3)。

In order to solve the pollution problem of SO_(2) and particular matter(PM)derived from fuels combustion in bulk curing barn,experimental sites were set up in Fujian,Guizhou,Yunnan,Henan and Hubei provinces to study the pollutant emission problems of bulk curing barn and formulate relevant emission reduction measures.The type and way of adding coal have a great influence on pollutant emission,the average emission concentration of SO_(2) was 658.96 mg/m^(3),that of particular matter was 65.52 mg/m^(3),and that CO was 3243.12 mg/m^(3).Installed wet desulphurization equipment could reduce SO_(2) emissions by 72%-92%and reduce particular matter emissions by 75%-92%,with the cost increased by 81.55 yuan.Installed automatic coal feeder could reduce coal consumption by 16.75%,reduce the baking cost by 28.85%,reduce pollutant emission by more than 40%,and increase the thermal efficiency by 24.91%.The combined use of wet desulfurization equipment and automatic stoker could stabilize the desulfurization efficiency at about 85%and control dust removal efficiency at about 95%.The installation of wet desulphurization equipment and automatic stoker could realize efficient desulphurization and dust removal,ensuring SO_(2) emission concentration from tobacco bulk curing barn below 30 mg/m^(3) and the particular matter emissions concentration below 15 mg/m^(3).