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首页> 外文期刊>International Journal of Heat Exchangers >Heat transfer and pressure drop in a lab scale no-distributor-fluidized-bed heat exchanger
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Heat transfer and pressure drop in a lab scale no-distributor-fluidized-bed heat exchanger

机译：实验室规模的无分配器流化床换热器中的传热和压降

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Heat recovery is the capture of energy contained in fluids or gases that would otherwise be lost from a facility. Using conventional heat exchangers in the flue gas heat recovery process requires periodical cleaning for normal operation because of the deposition of fly ash on the heat transfer surface which results lower heat transfer performance and corrosion. To overcome the fouling of fly ash on the heat transfer surface and erosion and periodical cleaning which are the major drawbacks in conventional heat exchangers for flue gas heat recovery, a 1 m high, 54 mm internal diameter single riser no distributor fluidized bed (NDFB) heat exchanger is devised. The heat transfer performance and pressure drop have been evaluated through experiments for the gas-to-water lab scale heat exchanger system. For proper design and operation of fluidized bed heat exchanger, it is important to know the effect of operating parameters on the bed to wall heat transfer coefficient. Glass beads (S.G. 2.62) of three mean sizes in the range of 250 to 800 urn were used as bed material. It was observed that the heat transfer coefficient in the fluidized bed was found to increase with increasing suspension density and decreasing particle size which in general agrees with the results from the previous research works. A simple mathematical correlation for this system was proposed to predict the heat transfer coefficient as a function of suspension density and particle diameter. Through the present study it was found that this type of heat exchanger can be applied to the heat recovery process from waste gases from furnaces, boilers and incinerators with higher efficiency and reduced fouling related problems.
机译：热量回收是捕获流体或气体中所包含的能量，否则这些能量会从设施中流失。在烟气热回收过程中使用常规热交换器需要定期清洁以进行正常操作，因为粉煤灰会沉积在传热表面上，从而导致传热性能和腐蚀降低。为克服粉煤灰在传热表面上的结垢以及侵蚀和定期清洁（这是常规热交换器用于烟气热回收的主要缺点），需要使用内径为1 m高，54 mm的单立管无分配器流化床（NDFB）设计了热交换器。通过实验，对气水实验室规模的换热器系统评估了传热性能和压降。为了正确设计和操作流化床换热器，重要的是要了解操作参数对床到壁传热系数的影响。三种平均粒径在250至800微米范围内的玻璃珠（S.G. 2.62）被用作床层材料。观察到，发现流化床中的传热系数随悬浮液密度的增加和粒径的减小而增加，这总体上与先前研究工作的结果一致。提出了该系统的简单数学关联，以预测传热系数与悬浮液密度和粒径的关系。通过本研究发现，这种类型的热交换器可以以更高的效率和减少与结垢有关的问题应用于从炉，锅炉和焚化炉的废气中进行热回收过程。

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