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首页> 外文期刊>Energy Conversion & Management >ESTIMATION OF COOLING TUBE LOCATION IN FLUIDIZED BED COAL COMBUSTORS THROUGH EXERGY ANALYSIS
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ESTIMATION OF COOLING TUBE LOCATION IN FLUIDIZED BED COAL COMBUSTORS THROUGH EXERGY ANALYSIS

机译：通过能量分析估算流化床燃烧室的冷却管位置。

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This paper presents the exergy analysis of fluidized bed coal combustors (FBCCs) under different arrangements of cooling tubes. Considering changes in the heat transfer coefficient due to the particle movement and coal combustion and drag coefficient changes due to the particle movement in the bed and in the freeboard, the second-law efficiency of combustors has been examined and the effect of cooling tube locations on effectiveness has been analyzed. The location of cooling tubes in an FBCC has been analyzed with exergy analysis of the combustor. In performing the simulations, two parameters were defined: the volume ratio ε, which is the ratio of the volume of cooling tubes to combustor volume; and the height ratio H_(e,o)/H, which is the ratio of the starting height of cooling tube surfaces to the height of the combustor. The effects of cooling tube location on combustor effectiveness were examined under the various conditions of heat exchanger surfaces and at different superficial velocities. The combustor effectiveness decreases along the bed height at every ε value, and its value at every level in the combustor decreases as the value of ε decreases. On the other hand, the decrement in effectiveness was observed at every point along the combustor height as the height ratio increases. Combustor effectiveness was not affected by the superficial velocity as the location of cooling tubes was changed from 0.6 H to higher values. Also, at higher values of ε, the height ratio had no major effect on combustor effectiveness.
机译：本文介绍了冷却管在不同布置下的流化床煤燃烧器（FBCC）的火用分析。考虑到颗粒运动和煤燃烧引起的传热系数的变化以及床层和干舷内颗粒运动引起的阻力系数的变化，研究了燃烧器的二次律效率，并研究了冷却管位置对燃烧效率的影响。有效性已被分析。 FBCC中冷却管的位置已通过燃烧器的火用分析进行了分析。在进行模拟时，定义了两个参数：容积比ε，即冷却管容积与燃烧室容积的比值；高度比H_（e，o）/ H，即冷却管表面的起始高度与燃烧器高度的比值。在换热器表面的各种条件和不同的表观速度下，检查了冷却管位置对燃烧器效率的影响。燃烧器效率沿床高度在每个ε值处降低，并且在燃烧器中每个水平处的值随ε值减小而减小。另一方面，随着高度比的增加，在沿燃烧器高度的每个点处观察到有效性的降低。由于冷却管的位置从0.6 H更改为更高的值，因此燃烧器的效率不受表面速度的影响。同样，在较高的ε值下，高度比对燃烧器的效率没有重大影响。

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