| THERMAL ENGINEERING |
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Measurement and prediction model for the acid dew point in flue gases |
| XIANG Baixiang, ZHAO Congzhen, DING Yanjun, MA Runtian, LV Junfu |
| Department of Thermal Engineering, Tsinghua University, Beijing 100084, China |
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Abstract The acid dew point in flue gases must be accurately predicted to avoid fouling and corrosion of the heating surfaces and improve the boiler thermal efficiency. Operating experience in many power plants has shown that current models over-predict the acid dew point. Two devices are built to measure the acid dew points for different conditions. Two models are then developed to predict the acid dew point based on thermodynamic correlations between the acid dew point and key factors in the system. Then, the flue gas acid dew points predicted by the models and from previous studies are compared to the experimental data. The results show that the plug-measuring device measurements are more sensitive to variations of the water vapor in the flue gas than the extraction-measuring device measurements.
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| Keywords
boiler
acid dew point
efficiency
corrosion
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Issue Date: 15 October 2015
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2015,
Vol. 55
