基于扩容蒸发与机械蒸汽再压缩深度处理燃煤电厂脱硫废水  

Advanced Treatment of Desulfurization Wastewater from Coal-fired Power Plants Based on Expansion Evaporation and Mechanical Vapor Recompression

作　　者：李昂 杨庚 安雪峰 安连锁[1] 张世平[1] LI Ang;YANG Geng;AN Xue-feng;AN Lian-suo;ZHANG Shi-ping

机构地区：[1]华北电力大学能源动力与机械工程学院

出　　处：《节能与环保》2021年第1期41-43,共3页

基　　金：国家重点研发计划(2018YFB0604304)。

摘　　要：本文提出一种扩容蒸发与机械蒸汽再压缩的耦合工艺系统,用于处理燃煤电厂内经预处理和浓缩减量后的脱硫废水。以某1000MW燃煤机组脱硫废水参数为例,采用AspenPlus软件建立相关模型,分析了换热器冷端温升、盐水温度、蒸发压力、有无余热回收等对工艺系统运行性能的影响。结果表明,当加热器冷端温升为3℃、闪蒸罐前盐水温度为91℃、蒸发压力为40kPa时,此时系统功耗存在最小值;余热回收可显著提高系统技术性能系数,热力性能系数最高为9.02。This paper proposes a coupling process system of expansion evaporation and mechanical vapor recompression, which is used to treat desulfurization wastewater after pretreatment and concentration reduction in coal-fired power plants. Taking the desulfurization wastewater parameters of a 1000 MW coal-fired unit as an example, the Aspen Plus software was used to establish a related model to analyze the influence of the cold end temperature rise, brine temperature, evaporation pressure, and the presence or absence of waste heat recovery on the performance of the process system. The results show that when the temperature rise at the cold end of the heater is 3℃, the brine temperature before the flash tank is 91℃, and the evaporation pressure is 40 kPa, the system power consumption has a minimum value at this time.waste heat recovery can significantly improve the technical performance coefficient of the system, the highest technical performance coefficient is 9.02.

关 键 词：脱硫废水 扩容蒸发 机械蒸汽再压缩 Aspen Plus 蒸发结晶 

分 类 号：X773[环境科学与工程—环境工程]