烟羽消白技术在40 t/h燃煤工业锅炉上的应用

Application of technology of flue gas off-whitening to 40 t/h coal-fired industrial boilers

以某供热中心2×40 t/h燃煤工业锅炉烟羽消白改造项目为例,介绍了烟羽消白的技术原理和发展现状,分析了"喷淋冷凝+烟气-蒸汽换热"烟羽消白系统的运行效果。结果表明:烟气冷凝温度为30~42℃,烟气湿度为4.5%~7%,出口烟气温度大于80℃;烟气的粉尘排放浓度由10 mg/Nm^(3)降至4 mg/Nm^(3),协同除尘效率为60%;烟气SO2平均排放浓度为19.4 mg/Nm^(3)左右,协同脱硫效率为35%;该系统运行稳定,烟气排放参数达到了超低排放标准要求(烟尘≤10 mg/Nm^(3)、SO2≤35 mg/Nm^(3)、NO_(X)≤50 mg/Nm^(3)),满足烟羽消白技术的设计要求。

A renovation project of flue gas off-whitening technology for two 40 t/h coal-fired industrial boilers in a heating center was selected as an example.The technical principle and development status of flue gas off-whitening technology were introduced.The operation effect of flue gas off-whitening system with"spray condensation+flue gas-steam heat exchange"was analyzed.The results showed that the condensing temperature of flue gas was 30~42℃,and the humidity of flue gas was 4.5%~7%.The outlet flue gas temperature was higher than 80℃.In addition,the dust concentration in flue gas was reduced from 10 mg/Nm^(3) to 4 mg/Nm^(3),and the collaborative dust removal efficiency was 60%.The average concentration of SO2 in flue gas was 19.4 mg/Nm^(3),and the synergistic desulfurization efficiency was35%.The system operates stably,and the flue gas emission meets the standard for ultra-low emission,which requires the concentration of dust≤10 mg/Nm^(3),SO2≤35 mg/Nm^(3),and NO_(X)≤50 mg/Nm^(3).It also meets the design requirements of flue gas off-whitening technology.