湿烟气冷凝过程传热计算及工程应用
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摘要
根据竖壁膜式冷凝的边界层传热传质原理得出了无量纲因子Ln对冷凝过程表面传热系数的影响,进行了湿烟气在多排管束换热器中的冷凝传热试验,并由试验数据拟合得到烟气冷凝过程Nu的准则方程。在此基础上研制了大型电站锅炉烟气冷凝换热器并成功运用于某电厂1 000MW机组。结果表明:烟气冷凝换热器实际运行性能参数与设计值吻合,该拟合式可用于工程设计。
By analyzing the effects of dimensionless factor Lnon the surface heat transfer coefficient during condensation process based on the principle of heat and mass transfer in the boundary layer of vertical wall film condensation,a number of condensation heat-transfer tests were conducted on the process of wet flue gas passing through the heat exchangers with multi-row tube bundles,and subsequently an Nuformula was fitted for the heat-transfer process using above experimental data.On this basis,a flue gas condensing heat exchanger was developed for large power plant boilers,which was successfully applied to a 1 000 MW power unit.Results show that the actual performance parameters of the flue gas condenser developed agree well with its design values,and the formula fitted may be used in engineering designs of similar flue gas condensers.
By analyzing the effects of dimensionless factor Lnon the surface heat transfer coefficient during condensation process based on the principle of heat and mass transfer in the boundary layer of vertical wall film condensation,a number of condensation heat-transfer tests were conducted on the process of wet flue gas passing through the heat exchangers with multi-row tube bundles,and subsequently an Nuformula was fitted for the heat-transfer process using above experimental data.On this basis,a flue gas condensing heat exchanger was developed for large power plant boilers,which was successfully applied to a 1 000 MW power unit.Results show that the actual performance parameters of the flue gas condenser developed agree well with its design values,and the formula fitted may be used in engineering designs of similar flue gas condensers.
引文
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[6]赵毅,马天忠,孟令海.脱硫后烟气冷凝酸液质量分数的数值预测[J].动力工程学报,2013,33(12):974-979.ZHAO Yi,MA Tianzhong,MENG Linghai.Numerical prediction on mass fraction of condensed acid solution after flue gas desulfurization[J].Journal of Chinese Society of Power Engineering,2013,33(12):974-979.
[2]王丽.冷凝式燃气热水器换热器的研究[D].上海:同济大学,2003.
[3]房正.用于烟道气热回收的热管换热器中对流冷凝传热试验研究[D].大连:大连理工大学,2008.
[4]杨世铭,陶文铨.传热学[M].3版.北京:高等教育出版社,1998.
[5] COLBURN A P,HOUGEN O A.Design of cooler condenser for mixtures of vapors with noncondensing gases[J].Industrial&Engineering Chemistry,1934,26(11):1178-1182.
[6]赵毅,马天忠,孟令海.脱硫后烟气冷凝酸液质量分数的数值预测[J].动力工程学报,2013,33(12):974-979.ZHAO Yi,MA Tianzhong,MENG Linghai.Numerical prediction on mass fraction of condensed acid solution after flue gas desulfurization[J].Journal of Chinese Society of Power Engineering,2013,33(12):974-979.