污泥掺烧对燃煤电站锅炉热效率的影响

摘要

研究高效、节能的污泥处理技术对环境保护有重要意义.通过热力计算详细分析了420 t/h的燃煤锅炉掺烧含水率为20%的干化污泥时,不同污泥掺烧比例对燃煤电站锅炉排烟温度、排烟热损失和锅炉热效率等参数的影响.结果表明,当掺烧比由0增加至10%时,锅炉排烟温度从1109.5 ℃上升到1125.8℃、空气预热器出口烟温从145 ℃上升到168℃、减温水量从11 t/h增加到26 t/h、热效率从90.6%下降到88.2%、燃煤量从69900 t/h减少到67830 t/h.%The research on energy saving and high efficiency sludge treatment technology is of great significance to environmental protection.Influence of coal -fired boiler combustion characteristics in 420 t/h coal-fired power plant boiler under different operating conditions was analyzed,which is based on bituminous coal and the dried sludge with water content of 20%in different proportions.The results showed that when the mixing ratio increased from 0 to 10%, the boiler outlet gas temperature rose from 1 109.5℃ to 1 125.8℃, and the air temperature increases at the air preheater exit rose from 145℃ to 126℃.The cooling water flow rate increased from 11 t/h to 26 t/h,and the thermal efficiency dropped from 90.6%to 88.2%.And the coal combustion decreased from 69 900 t/h to 67 830 t/h.