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暖通空调杂志社>期刊目次>2021年>第3期

烟气消白临界排烟温度数学模型的对比分析

Mathematical model and comparative analysis of critical flue gas emission temperature of wet plume removal technologies

王明鑫[1] 章立新[1] 高明[1] 刘婧楠[1] 尚立新[2]
[2]上海理工大学 [2]国家能源(上海)电站空冷系统研发中心

摘要:

针对目前常用的湿烟羽抬升模型和温湿图切线模型,推导得到2种模型烟气消白临界排烟温度的计算公式,对比分析了烟气加热、冷凝、冷凝再热3种消白方式下临界排烟温度计算结果的偏差。结果表明:低温高湿的环境、烟气冷凝再热方式的起始再热点烟温较高,都不利于湿烟羽的消除;2种模型所得结果的变化规律完全一致,但温湿图切线模型与湿烟羽抬升模型相比,加热方式下消白临界排烟温度高3.5~4.5 ℃,冷凝方式下低0.5~1.5 ℃,冷凝再热方式下高1~7 ℃;温湿图切线模型计算的消白临界排烟温度能满足湿烟羽抬升模型对烟气消白的要求。

关键词:湿烟羽,烟气消白,临界排烟温度,湿烟羽抬升模型,温湿图切线模型

Abstract:

Aiming at the commonly used wet plume uplift model and temperature-humidity graph tangent model, derives the calculation formulas of critical flue gas emission temperature under two models, and compares and analyses the deviation of critical flue gas emission temperature under three wet plume removal technologies of flue gas heating, condensation and condensation and reheating. The results show that the environment of low temperature and high humidity and the high initial reheating temperature of flue gas condensation and reheating technology are not conducive to the elimination of wet plume. The change rules of the results obtained by two models are completely consistent. However, compared with the wet plume uplift model, the critical flue gas emission temperature of the temperature-humidity graph tangent model is 3.5 to 4.5 ℃ higher under heating technology, 0.5 to 1.5 ℃ lower under condensation technology, and 1 to 7 ℃ higher under condensation and reheating technology. The critical flue gas emission temperature calculated by the temperature-humidity graph tangent model can meet the requirements of the wet plume uplift model for wet plume removal.

Keywords:wetplume,wetplumeremoval,criticalfluegasemissiontemperature,wetplumeupliftmodel,temperature-humiditygraphtangentmodel

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