基于热化学试验的600MW 亚临界机组汽轮机积盐分析
发布: 2009-11-12 14:28 | 作者: 王应高 | 来源: 电厂化学2009 学术年会暨中国电厂化学网2009 高峰论坛会议论文集 | 查看: 260次
王应高，星成霞，李永立,金绪良
（华北电力科学研究院有限责任公司，北京 100045）
[摘要] 高参数大容量机组出于防止汽轮机积盐的考虑对蒸汽品质的要求更为严格，控制标准更为苛刻。但在本文所考察的数台600MW 机组中却依然存在汽轮机积盐现象，影响到机组的经济运行也构成了安全隐患。对此，本文在规范和优化试验方法和试验项目的基础上，对数台同型号机组进行了热化学试验研究，探讨了炉水平衡磷酸盐处理工况（EPT）和机组运行参数对蒸汽品质的影响，考察了汽包结构对蒸汽品质的影响。从而优化了炉水的磷酸盐平衡点浓度和pH 值等水质调控标准，明确了机组运行参数对蒸汽品质的影响规律，也发现了汽包结构中存在的影响蒸汽品质的新问题。最后提出了高参数机组汽轮机积盐预防措施。
[关键词] 汽轮机积盐；热化学试验；蒸汽品质；预防措施
Analysis of Salt Deposits in Steam Turbine of 600MW Subcritical Unit Based on Thermo-chemical Test
ABSTRACT： Considering the problem of steam turbine salt deposition, high parameter large capacity unit required more
purified steam and more strict control standards. While, the problem of steam turbine salt deposition still exists among the 600MW
units investigated by this paper. The effect of salt deposits in turbine on efficiency and safety of unit can not be inobservant. Based on
the normalization and optimization of experimental methods and experiment items, this paper carried out thermo-chemical
experiment study on several 600MW units with same type boilers, and then, discussed the effect of EPT, operation parameters of
boilers and the structure of steam drum on the quality of steam. As results, the optimized control standards of boiler water, EPT and
pH, were promoted, and the extent of operation parameters effect on steam purity were researched, and the new problem of boiler
steam drum structure was founded, finally, the methods of providing salt deposition in steam turbine for high parameter and large
capacity units were promoted.
KEY WORDS：Salt Deposits in Turbine; Thermo-chemical Test; Steam Quality; Precaution Methods
1 前言
汽轮机积盐作为影响机组安全经济运行的重要因素之一，一直是业内关注的重点问题[1]。近年来，随着高参数大容量机组的不断投入运行，汽轮机积盐问题带来的危害越来越显著[2][3]，已经成为研究的热点。600MW 亚临界机组作为国内主力发电机组，已有数台在大修期间发现了严重的汽轮机积盐现象，这是造成机组出力和热效率下降的主要原因[4][5]。
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