水汽系统积盐问题分析及处理

Research and treatment of salt accumulation in the water and steam system of a power plant

尿素水解制氨技术已广泛应用于火电机组脱硝还原剂的制备。然而,若出现尿素质量不合格,尿素水解器发生泄漏以及水解器疏水回用至凝汽器的情况,会对热力系统造成巨大危害。对某燃煤机组尿素水解器泄漏致水汽系统严重积盐及过热器爆管进行了分析,并提出了补充处理方案。实施后机组各项水汽指标均达到《火力发电机组及蒸汽动力设备水汽质量》(GB/T 12145—2016)要求,为水汽系统积盐的原因分析及处理提供了解决方案。

The urea hydrolysis technology for ammonia production has been widely used in the preparation of denitration reducing agents for thermal power units.However,if the quality of urea is not up to standard,the urea hydrolyzer will leak,and the drainage from the urea hydrolyzer will be reused in the condenser,which will cause great harm to the thermal system.The article analyzes the serious salt accumulation and superheater tube explosion in the water and steam system caused by the leakage of a urea hydrolyzer in a coal-fired unit,and proposes a solution to the salt accumulation problem.The problem has been successfully solved,after the unit is started,all quality criterion of water and steam meet the requirements of Quality Criterion of Water and Steam for Power Plant and Steam-generating Equipment(GB/T 12145—2016).This article provides a solution for analyzing and treating the cause of salt accumulation in the water and steam system for reference.