Effect of packing density on thermal properties of granular activated carbon packed bed by using of inverse heat conduction method
Effect of packing density on thermal properties of granular activated carbon packed bed by using of inverse heat conduction method
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发表时间：
2014
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通讯作者：
M. Oskouei;Z. Tamainot-Telto
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作者：
M. Oskouei;Z. Tamainot-Telto
颗粒活性炭（GAC）吸附大量制冷剂气体的能力使其非常适合用于热压缩机。为了使热压缩机在经济上可行，必须减小尺寸，因此在加热和冷却过程中应尽可能增加热响应。本文研究了当实验样品反应器壁面施加温度突变时，GAC床层密度对热瞬态响应的影响。测试样品由1 "外径不锈钢组成，厚度为0.71 [mm]，长度为200[mm]，加载有压实的颗粒活化。使用的颗粒碳是208C（椰子壳基），13×30孔径，由“Chemviron碳公司”提供。为了计算接触壁/填充碳的传热系数(h)和填充床的导热系数(k)，采用数值反热传导法结合基于最小化均方误差（MSE）的迭代过程。实验工作是通过在温度控制的水浴中测量浸入样品的壁和中心温度来进行的，温度约为85 [o C]。对填充床密度在500 ~ 800 kg/ m3之间的5个样品进行了测试，结果表明，当填充床密度为0.15时，接触壁/填充碳的导热系数(k)和传热系数(h)呈准线性增长。[K] < K < 0.45 [W/m]。K和150 [W/m]
The ability of granular activated carbon (GAC) to adsorb large mass of refrigerant gases makes it ideal for use in thermal compressor. In order to make thermal compressor economically viable, the size must be reduced and for that reason thermal responses should be increase as much as possible during heating and cooling process. This paper investigates the effect of GAC bed density on the thermal transient responses when a sudden change in temperature is imposed on wall of a test sample reactor. The test sample consists of 1” OD stainless steel with 0.71 [mm] thickness and 200[mm] length that is loaded with compacted granular activated. The granular carbon used is 208C (coconut shell base) with 13×30 mesh size and provided by ‘Chemviron Carbon Company’. To find the heat transfer coefficient of the contact wall/packed carbon (h) and packed bed thermal conductivity (k) a numerical inverse heat conduction method is used in conjunction with an iterative process based on minimizing the Mean Square Error (MSE) from measured temperatures. Experimental work is carried out by measuring the wall and centre temperatures of submerged sample in a temperature controlled water bath at around 85 [ o C]. Five samples with the packed bed density ranging from 500 [kg/m 3 ] to 800 [kg/m 3 ] were tested and the results show a quasi-linear increase of both thermal conductivity (k) and heat transfer coefficient of the contact wall/packed carbon (h) with the packed bed density: 0.15 [W/m.K] < k < 0.45 [W/m.K] and 150 [W/m