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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Convective heat transfer characteristics of high-pressure gas in heat exchanger with membrane helical coils and membrane serpentine tubes
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Convective heat transfer characteristics of high-pressure gas in heat exchanger with membrane helical coils and membrane serpentine tubes

机译：膜螺旋线圈和蛇形管的换热器中高压气体的对流传热特性

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摘要

Since the heat transfer performance of syngas cooler affects the efficiency of the power generating system with integrated coal gasification combined cycle (IGCC) directly, it is important to obtain the heat transfer characteristics of high-pressure syngas in the cooler. Heat transfer in convection cooling section of pressurized coal gasifier with the membrane helical coils and membrane serpentine tubes under high pressure is experimentally investigated. High pressure single gas (He or N_2) and their mixture (He+N_2) gas serve as the test media in the test pressure range from 0.5MPa to 3.0MPa. The results show that the convection heat transfer coefficient of high pressure gas is influenced by the working pressure, gas composition and symmetry of flow around the coil, of which the working pressure is the most significant factor. The average convection heat transfer coefficients for various gases in heat exchangers are systematically analyzed, and the correlations between Nu and Re for two kinds of membrane heat exchangers are obtained. The heat transfer coefficient of heat exchanger with membrane helical coils is greater than that of the membrane serpentine-tube heat exchanger under the same conditions. The heat transfer coefficient increment of the membrane helical-coil heat exchanger is greater than that of the membrane serpentine-tube heat exchanger with the increase of gas pressure and velocity.
机译：由于合成气冷却器的传热性能直接影响带有集成煤气化联合循环（IGCC）的发电系统的效率，因此重要的是获得冷却器中高压合成气的传热特性。实验研究了加压气化炉中带膜螺旋盘管和膜蛇形管在高压下对流冷却段的传热。在0.5MPa至3.0MPa的测试压力范围内，高压单一气体（He或N_2）及其混合物（He + N_2）作为测试介质。结果表明，高压气体的对流传热系数受工作压力，气体成分和盘管周围流动对称性的影响，其中工作压力是最重要的因素。系统地分析了换热器中各种气体的平均对流换热系数，得到了两种膜式换热器的Nu和Re之间的相关性。在相同条件下，带有膜螺旋盘管的热交换器的传热系数大于膜蛇形管热交换器的传热系数。随着气体压力和速度的增加，膜螺旋盘管热交换器的传热系数增量大于膜蛇形管热交换器的传热系数增量。

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