燃机电站余热锅炉硫酸露点腐蚀试验研究

doi:10.11930/j.issn.1004-9649.201907138

中国电力 ›› 2020, Vol. 53 ›› Issue (8): 125-130,138.DOI: 10.11930/j.issn.1004-9649.201907138

燃机电站余热锅炉硫酸露点腐蚀试验研究

朱志平, 刘志峰, 黄赵鑫, 张俞

长沙理工大学化学与生物工程学院，湖南长沙 410114

收稿日期:2019-07-20 修回日期:2020-03-05 发布日期:2020-08-05
作者简介:朱志平(1963-),男,博士,教授,从事热力设备腐蚀与防护及锅炉水化学优化教学与研究,E-mail:zzp8389@163.com
基金资助:
湖南省研究生创新资助项目(燃机电站余热锅炉低温段金属材料的露点腐蚀特性研究，CX20190700)

Experimental Study on Sulfuric Acid Dew Point Corrosion of Waste Heat Boiler in Gas Turbine Power Station

ZHU Zhiping, LIU Zhifeng, HUANG Zhaoxin, ZHANG Yu

School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410114, China

Received:2019-07-20 Revised:2020-03-05 Published:2020-08-05
Supported by:
This work is supported by Hunan Graduate Innovation Project (Research on Dew Point Corrosion Characteristics of Metal Materials in Low Temperature Section of Waste Heat Boiler in Gas Turbine Power Station, No.CX20190700)

摘要/Abstract

摘要： 硫酸露点腐蚀可导致燃机电站余热锅炉安全性与经济性降低。为探究其机理，结合现场运行工况，按热力学原理计算出了燃机电站余热锅炉凝结硫酸浓度分布值。以此为依据，对余热锅炉常用的20 G钢进行了硫酸露点腐蚀模拟试验；结合电化学工作站、透反射金相显微镜、扫描电子显微镜（SEM）、X射线衍射（XRD），对20 G钢的电化学性能及表面形貌进行了分析。试验结果表明：低温-低浓度硫酸腐蚀情况比高温-高浓度硫酸腐蚀情况严重，若将给水加热器入口水温提高至80 ℃以上，可减小低温段管道腐蚀速率。

关键词: 燃机电站, 露点腐蚀, 热力学计算, 腐蚀速率, 模拟试验

Abstract: The safety and economy of the waste heat boiler of the gas turbine power station will be undermined because of the sulfuric acid dew point corrosion. To figure out the exact mechanism, by taking account of the field operating conditions, the distribution value of the condensation acid concentration of the waste heat boiler of the gas turbine power station is calculated according to the thermodynamic principle. Based on this, the dew point corrosion simulation experiments of 20G steel used for the waste heat boiler is carried out. The electrochemical performance and surface morphology of 20G were analyzed by electrochemical workstation, transflective metallographic microscope, scanning electron microscope (SEM) and X-ray diffraction (XRD). The results of immersion test show that the low temperature-low concentration sulfuric acid corrosion is much more destructive than the high temperature-high concentration sulfuric acid. If the inlet water temperature of the feedwater heater is raised to above 80 ℃, the corrosion rate of the pipeline can be greatly reduced in its low temperature section.

Key words: gas turbine power station, dew point corrosion, thermodynamic calculation, corrosion rate, simulation experiment

朱志平, 刘志峰, 黄赵鑫, 张俞. 燃机电站余热锅炉硫酸露点腐蚀试验研究[J]. 中国电力, 2020, 53(8): 125-130,138.

ZHU Zhiping, LIU Zhifeng, HUANG Zhaoxin, ZHANG Yu. Experimental Study on Sulfuric Acid Dew Point Corrosion of Waste Heat Boiler in Gas Turbine Power Station[J]. Electric Power, 2020, 53(8): 125-130,138.

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https://www.electricpower.com.cn/CN/Y2020/V53/I8/125

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燃机电站余热锅炉硫酸露点腐蚀试验研究

Experimental Study on Sulfuric Acid Dew Point Corrosion of Waste Heat Boiler in Gas Turbine Power Station

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燃机电站余热锅炉硫酸露点腐蚀试验研究

Experimental Study on Sulfuric Acid Dew Point Corrosion of Waste Heat Boiler in Gas Turbine Power Station

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