摘要：

介绍了某热电厂脱硫废水旁路烟道蒸发系统工程设计开发及其应用情况。通过热力模拟计算分析发现，利用烟气蒸发不能消耗现有全部脱硫废水，需要对脱硫废水进行减量处理。本工程设计采用软化浓缩工艺对脱硫废水进行减量处理，所得淡水回用，而浓盐水去旁路烟道蒸发系统。运行结果表明：反渗透浓水中钙离子浓度控制在4 mmol/L以内，能满足反渗透装置长时间运行；蒸发塔抽取的最大热烟气量可以达到5%~6.5%，蒸发塔运行压差均小于空预器压差；喷枪的耐磨性要好于雾化盘。

关键词: 脱硫废水, 旁路烟道蒸发, 系统设计, 运行分析, 经济分析

Abstract:

An engineering design and application of desulfurization wastewater bypass flue evaporation system in a thermal power plant was introduced. By thermal simulation calculation and analysis, the desulfurization wastewater couldn't be totally consumed by bypass flue evaporation and need to be reduced. The design adopted softening and concentration process to reduce the amount of desulfurization wastewater. The fresh water obtained was reused, and the concentrated brine was went to the bypass flue evaporation system. The operating results showed it could meet the long-term operation of the reverse osmosis device when the concentration of calcium ions in the reverse osmosis concentrated water was controlled within 4 mmol/L. The amount of hot flue gas extracted by the evaporation tower could reach 5%-6.5%, and the operating pressure difference of the evaporation tower was less than that of the air preheater. The abrasion resistance of the spray gun was better than that of the atomizing disk.

Key words: desulfurization wastewater, bypass flue evaporation, system design, operational analysis, economic analysis

中图分类号: 

• X773