900MW机组凝结水精处理系统混床设备运行优化

Operation Optimization for Condensate Polishing Mixed Bed of 900-MWUnits

上海外高桥第二发电有限责任公司900 MW机组凝结水精处理系统投运7年后,备用混床内树脂出现分层现象,同时存在失效树脂输送不彻底问题,为此展开分析。研究结果表明该系统存在阀门不严密、树脂混合前水位高、喷嘴角度偏离以及充水顶压不合要求等问题。制定并实施优化方案后,使问题得以解决,在出水水质和热力系统水汽品质合格的情况下,凝结水精处理系统混床周期制水量提高约20%,减少酸碱使用量33%,每年每台机组减少再生用除盐水4 000 t,经济和环境效益显著。

Layered resin and residual failure resin appear in the spare mixed bed of the condensate polishing system for the 900-MW units of Shanghai Waigaoqiao No.2 Power Generation Co. Ltd., after seven-year operation. Studies on these phenomena are carried out, which demonstrates many problems in the system such as incomplete closing of valves, high water level before resin mixing, deflected spray nozzle and inadequate pressurization of filling water. Therefore, an optimization plan is made and implemented to address the above problems. On the premise of the qualified water quality through the mixed bed as well as the water and steam qualities of the thermal system, the throughput in the mixed bed cycle of the condensate polishing system is increased by 20%, while the acid and caustic consumption is reduced by 33% and the demineralized water used for resin regeneration per unit is reduced by 4 000 t annually, which shows significant economic and environmental benefits.