预防蒸发器结垢及化学除垢

Prevention and Cleaning of the Scale Formed in the Evaporator

本文介绍了长管升膜式蒸发器浓缩获苇浆黑液预防垢层形成及化学除垢中的一些经验,并指出了应注意的关键问题。为保持蒸发器的高效率,维持良好的运行周期,除了保证稀黑液具有一定的游离碱含量外,黑液的净化处理及其在生产运行中合理调整工艺参数也是很重要的。另外,酸洗流程的配备,其过程中各个环节的控制好坏对酸洗的进程及效果影响很大。

In this paper, formation and cleaning of the scale in the raising film longtube evaporator for evaporating black liquor of reed and De are discussed. In order to maintain a higher evaporation efficiency, and longer period of operation. quality of weak black liquor especially the free alkali content has to be assured. Clarification and screening. of weak black liquor, and monitoring of operating variable during evaporation are also important.For an efficient acid washing, proper selection of washing program and control of several variables during cleaning operation are very important.