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用于燃煤锅炉烟气余热回收的顺流烟气喷淋塔的实验与理论研究

Theoretical and Experimental Studies of Parallel-flow Spray Tower for Surplus-heat Recovery System of Flue Gas in Coal-fired Boilers
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摘要 吸收式热泵与烟气喷淋塔结合的烟气余热回收系统能有效回收燃煤锅炉烟气余热,而烟气喷淋塔是该系统的重要组成部件。该研究对顺流式烟气喷淋塔进行了实验与理论研究,建立了一维数学模型,模拟计算结果与实验结果的偏差在±5%以内,表明模型较好地反映了烟气喷淋塔内部的热质交换过程,可用于预测喷淋塔的换热效果,指导烟气喷淋塔的设计。该研究还对液气比、液滴粒径、喷淋塔高、烟气流速等关键因素对烟气喷淋塔换热效果的影响进行了分析。 The waste-heat recovery system of flue gas comprised of the absorption heat pump and the flue-gas spray tower could effectively collect a large amount of latent heat contained in the exhausted gas from coal-fired combined heat and power plant(CHP). The flue-gas spray tower is an important component for this system. In this paper, experimental and theoretical investigations are conducted to analyze the thermodynamic process inside the flue-gas spray tower. A one-dimension model for the parallel-flow spray tower has been developed, taking into account the effect of droplet movement on the heat and mass transfer. The droplet sizes are measured and are adopted in the simulation. The simulation results are in accordance with experimental data and the maximum error is 4.3%, which illustrates the one-dimension model could be used to predict the behavior of the flue-gas spray tower. The effects of liquid-gas ratio, droplet size, tower height and gas velocity on flue-gas spray tower are also examined.
作者 王静贻 付林 赵金姊 赵玺灵 张世钢 孙方田 WANG Jing-Yi1, FU Lin1, ZHAO Jin-Zi2, ZHAO Xi-Ling1,ZHANG Shi-Gang1,SUN Fang-Tian2 (1. Department of Building Technologies, Tsinghua University, Beijing 100084, China; 2. School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100084, China)
出处 《工程热物理学报》 CSCD 北大核心 2018年第5期1070-1077,共8页 Journal of Engineering Thermophysics
关键词 烟气余热回收 顺流烟气喷淋塔 燃煤锅炉 实验验证 waste heat recovery parallel-flow flue-gas spray tower coal-fired boiler experimental verification
作者简介 王静贻(1988),女,博士研究生,主要研究方向:烟气余热回收。;通信作者:付林,教授,博士生导师,fulin@mail.tsinghua.edu.cn
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