停用保护剂对锅炉启停期间水汽中TOCi的影响研究  

Effects of Lay-up Protective Agent on Water and Steam TOCi During Unit Start-up and Lay-up Processes

作　　者：邓宇强 齐佶 王启亮 祁东东 宋飞[3] 李海洋 程家庆 王冬梅 马彦斌 DENG Yuqiang;QI Ji;WANG Qiliang;QI Dongdong;SONG Fei;LI Haiyang;CHENG Jiaqing;WANG Dongmei;MA Yanbin(Huadian Electric Power Research Institute Co.,Ltd.,Hangzhou 310030,China;Huadian Xinjiang Power Co.,Ltd.,Urumqi 830063,China;Xi'an Thermal Power Research Institute Co.,Ltd.,Xi'an 710032,China)

机构地区：[1]华电电力科学研究院有限公司,浙江杭州310030 [2]华电新疆发电有限公司,新疆乌鲁木齐830063 [3]西安热工研究院有限公司,陕西西安710032

出　　处：《中国电力》2020年第6期161-165,196,共6页Electric Power

摘　　要：火电机组停运保护剂的使用较普遍,但关于含有机成分的保护剂对水汽总有机碳离子(TOCi)指标影响的研究及相关运行控制经验不足。为此,对几种常用机组停运保护剂在亚临界、超临界、超超临界机组应用后水、汽中TOCi浓度和氢电导率进行了实验研究。结果发现:含碳有机保护剂加入水汽系统后,给水和蒸汽的TOCi和氢电导率会严重超标,其中给水TOCi浓度最高时达标准上限的10倍以上,氢电导率最高时达标准上限的3倍以上,因而增加了水汽系统的腐蚀风险。鉴于此,应尽量选择不含有机碳链成分的机组停运保护剂;若采用含碳有机成分保护剂,应加强停机期间或启动运行初期水汽TOCi和氢电导率的监控,以指导保护剂的加入量和系统冲洗操作,或采用投运凝结水精处理系统的方式,将水汽的TOCi指标控制在标准范围以内。Although protective agents have been applied in many power plants to inhibit corrosion during unit shut-down process,related research and operation experience seem to be inadequate regarding the effect of the protective agents containing organic compound on the TOCi(total organic carbon ion)values of steam and water in boiler.Thus experimental studies have been performed for several protective agents used in subcritical,supercritical and ultra-supercritical units in the aspects of the TOCi and cation conductivity values changes.This study result revealed that TOCi and cation conductivity of feedwater and main steam would exceed standard values severely.Specifically,the TOCi concentration would reach more than ten times of the standard limit while the cation conductivity would be more than three times of the maximum limit value respectively,which definitely increased the risk of corrosive hazard of steam and water system.Therefore,the protective agent free of chained carbon component should be selected whenever possible.If organic agents had to be a choice,the TOCi and cation conductivity must be placed under supervisory control during shutdown or initial start-up processes so as to provide directions for the addition of agents as well as the system flushing operation.It was also suggested that condensate polishing system should be put into operation during unit lay-up and start-up process such that the TOCi values of steam and water could be constrained within the standard range.

关 键 词：火电厂 停运保护 保护剂 TOCi 氢电导率 

分 类 号：TM621[电气工程—电力系统及自动化]