水平管降膜蒸发器防除垢在线清洗系统的研究设计

Study on the Cleaning System for Prevention and Elimination of Scale in Horizontal Tube Falling Film Evaporator

关键词:  水平管降膜蒸发器  长管自旋涡流清洗喷嘴  防除垢  蒸发强度  传热系数

Key Words:horizontal tube falling film evaporator  long tube spin vortex nozzle  prevention and elimination of the scale  evaporation capacity  heat transfer coefficient

摘要:选用制浆黑液作为试验工质,对水平管降膜蒸发器防除垢在线清洗系统进行了研究设计。试验结果表明,在线清洗系统具有明显的防除垢功效,显著提高了黑液蒸发器的蒸发强度和传热系数,可节能25%以上,减少投资25%以上,并可保持出料浓度的稳定性,原因主要是通过PLC控制长管自旋涡流清洗喷嘴对换热管表面的定时清洗,始终保持换热管表面的光洁度,防止换热管表面垢层的形成和堆积,蒸发运行过程中不再需要各效之间的切换洗涤操作。

Abstract:Using black liquor as working medium, the paper focused on the research and design of the on-line cleaning system for prevention and elimination of scale in horizontal tube falling film evaporator. The result showed that the on-line cleaning system had obvious effect on the prevention and elimination of scale formation, the capacity and heat transfer coefficient of the evaporator were improved. It could save energy more than 25% and reduce investment more than 25%, and maintain the stability of the concentration of the material at outlet. The main reason is that the on-line cleaning system is controlled by PLC and the long tube spining vortex nozzle can regularly clean the surface of heat exchange tube, keeping high cleanliness of the surface of the tube, evaporation operation no longer needs to switch washing operation in the effects．