焙烧炉烟气余热回收及利用技术  

The Recovery and Utilization of Waste Heat Technology for Calciner Flue Gas

作　　者：罗振勇 LUO Zhen-yong(Guiyang Aluminium and Magnesium Design and Research Institute Co.,Ltd.,Guiyang 550081,China)

机构地区：[1]贵阳铝镁设计研究院有限公司,贵州贵阳550081

出　　处：《世界有色金属》2023年第10期17-19,共3页World Nonferrous Metals

摘　　要：本文介绍了一种氧化铝厂气态悬浮焙烧炉烟气余热回收以及将回收的烟气余热用于氧化铝生产的节能新技术。本技术采用喷淋冷却塔对高温焙烧炉烟气进行喷淋冷却,通过直接换热方式,烟气中的水蒸汽释放其潜热,大部分热量回收进入喷淋循环水中。升温后的循环水再与经过真空闪蒸后的蒸发原液进行热交换,使真空闪蒸后的原液温度升高,温度升高后的蒸发原液再返回进行真空闪蒸,最终蒸发原液浓度得到提高,降低了蒸发工段低压蒸汽消耗,节约了氧化铝生产的综合能耗。本文对焙烧炉烟气余热回收及利用技术进行了热平衡计算和运营成本估算,分别从技术和经济角度分析了本技术应用于氧化铝生产企业的可行性。This paper introduces a new energy saving technology of gas suspension calciner in alumina plant,this technology can recycle the waste heat of flue gas and apply it to production of alumina.The water cooling tower was used to spray cooling the high temperature flue gas of calciner by direct heat exchange.The latent heat was discharged from water vapor in flue gas,and the heat was recycled into spray water.The warming recycled water transfer heat to spent liquor after vacuum flashing.The concentration of spent liquor was higher than before.And then the low pressure steam consumption was lower than before,the comprehensive energy consumption of alumina production was saved.The heat balance calculation and operating cost estimation for the technology were provided in this paper.The feasibility which the technology was applied to alumina industries was analyzed from technical and economic point of view.

关 键 词：焙烧炉 烟气余热 水蒸汽潜热 回收及利用 

分 类 号：X706[环境科学与工程—环境工程]