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

doi:10.11930/j.issn.1004-9649.201907138

Abstract

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

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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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201907138

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

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