净水技术2024，Vol.43Issue(z2)：117-124,330,9.DOI:10.15890/j.cnki.jsjs.2024.s2.017
超临界供热机组主蒸汽氢电导率超标原因分析
Analysis on Causes of Hydrogen Conductivity Exceedance in Main Steam of Supercritical Heating Units
摘要
Abstract
Aiming at the problem of hydrogen conductivity exceeding the standard in the main steam of a supercritical heating unit,the hydrogen conductivity contribution of different ions was calculated by the combination of ion chromatograph,TOC instrument and trace TOCi analyzer from the aspects of organic matter and inorganic anion content.The contribution of hydrogen conductivity generated by different ions was calculated by the molar conductivity and ion content,and the main impurity impact was analyzed.By investigating the hydrogen conductivity increment when the operating conditions such as water making equipment,water source,pharmaceutical dosage and heating were changed,multiple operation factors were studied.The results showed that the contribution of CH3COO-and HCOO-to the hydrogen conductivity in feed water was 0.024 μS/cm and 0.018 μS/cm,accounting for 46.7％.The content of CH3COO-and HCOO-ions in main steam continued to increase,and the contribution to the hydrogen conductivity was 0.056 μS/cm and 0.048 μS/cm,accounting for 76.5％.It is concluded that the organic matter in the boiler feed water will decompose into low molecular organic acids at high temperature and high pressure.The increase of organic acids in main steam is the main reason for the hydrogen conductivity exceeding the standard.The total amount of organic matter in the Yangtze River water suddenly increased by 46.8％,exceeding the current capacity of the water treatment system.The removal rate of organic pollution factors in raw water by the first-stage reverse osmosis process of the plant is about 76％,far lower than that of the same type of equipment,resulting in the TOC of supplementary water exceeding the standard.In addition,organic bromo non-oxidizing bactericide and anion resin dissolved substance will also increase the content of organic matter in the desalination water.It is suggested that supervision and control of TOCi in raw water and supplementary water should be more strict for heating units,and TOCi and ion chromatography should be used as necessary water quality supervision means.关键词
供热机组/总有机碳/有机物/除盐水/主蒸汽/氢电导率Key words
heating unit/total organic carbon/organic matter/demineralized water/main steam/hydrogen conductivity分类
信息技术与安全科学引用本文复制引用
尉院春,李洪峰,韩松,张海峰,于响生..超临界供热机组主蒸汽氢电导率超标原因分析[J].净水技术,2024,43(z2):117-124,330,9.基金项目
国家能源集团科学技术研究院有限公司科技项目(DY2023Y04) （DY2023Y04）
