湿烟气冷凝过程传热计算及工程应用

Heat Transfer Calculation for Wet Flue Gas Condensation Process and its Engineering Application

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 000MW 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.