七效管式降膜分段蒸发工艺分析  

Analysis on seven-effect tube falling film section evaporation process

作　　者：齐东华[1] 宋治林[1] Qi Donghua;Song Zhilin(Shenyang Aluminium and Magnesium Engineering and Research Institute Co.,Ltd.,Shenyang 110001,China)

机构地区：[1]沈阳铝镁设计研究院有限公司,辽宁沈阳110001

出　　处：《轻金属》2022年第5期13-18,共6页Light Metals

摘　　要：目前七效逆流管式降膜两段蒸发工艺已成功在氧化铝生产中应用,该技术也是当前新建、改建或扩建氧化铝工厂的主流蒸发技术。为了对该工艺有更深入了解,本文通过对不同条件下七效管式降膜分段蒸发的物料及热量平衡计算,分析了原液量、汽水比、器组运转功率、蒸发强度、平均比热、溶液沸点升、总传热面积在一定条件下的变化规律,从而验证了采用七效逆流两段蒸发工艺的原因;同时还分析了当提高蒸水量和提高Ⅴ效进料比例时以上参数的变化规律,将为相关技术人员和生产操作人员提供参考。The seven-effect countercurrent tube falling film two-section evaporation process has been successfully applied to the alumina production currently, and this technology is also the mainstream evaporation technology in newly-built, rebuilt or expanded alumina plants. In order to have a better understanding of the process, this paper calculated the material and heat balance of the seven-effect tube falling film section evaporation under different conditions, with analysis conducted on the variation rules of spent liquid flow, steam water ratio, operating power, evaporation intensity, average specific heat, boiling point rise and total heat transfer area under certain conditions, so as to verify the reason for adopting the seven-effect countercurrent two-section evaporation process. Meanwhile, the changing rules of the above parameters were also analyzed when the steam flow and ⅴ-efficiency feed ratio were increased, thus providing reference for relevant technical personnel and production operators.

关 键 词：管式降膜 分段蒸发 蒸发强度 比热 沸点升 

分 类 号：TQ133.1[化学工程—无机化工] TQ028.61