固定床论文：固定床内冷却错流传热的研究.docVIP

固定床论文：固定床内冷却错流传热的研究 【中文摘要】本文在单管冷却的小型实验装置上,以甲醇合成催化剂C306为填充物,冷却水为介质,研究了固定床床层冷却时的错流传热情况,获得了固定床内冷却错流传热的温度场；建立了固定床冷却错流传热的拟均相二维双参数模型,并通过最优化方法,以与实验测定的温度分布最接近为条件,求解该传热模型,获得了固定床错流传热过程的对壁给热系数hw和床层有效导热系数λb的值。结果表明：冷却错流床层中的等温线是以流动方向为长轴的椭圆形曲线,热量传递是顺流体流动方向进行,而逆流体流体方向几乎不发生热量传递。在固定床冷却错流传热过程中,壁给热系数hw和床层有效导热系数λb随着Rep的增大而增大,随着气体进口温度升高而增大。最后.本文也得到了C306甲醇催化剂颗粒床层,在Tin=200～300℃,Rep=400～1100范围内的冷却错流传热关系式。 【英文摘要】In this paper, based on the small size experiment device of single pipe cooling, with methanol synthesis catalyst C306 as padding and air as medium, through the research of the cross-flow heat transfer in the fixed bed with the bed layer being cooled by gas, we obtained the temperature field of the cross-flow in the fixed bed, and also analyzed the temperature distribution regularity in the fixed bed. Through the optimization method, under the given precision requirement, we find the temperature distribution which is nearest to the temperature distribution measured by experiment and also the most ideal theory bed temperature distribution. Meanwhile, we get the value of the wall heat transfer coefficient hw and the bed effective coefficientλb in the real fixed bed with cross-flow heat transfer.The study found that the isotherm of the cooling cross-flow in the fixed bed is elliptic curve with the gas flow direction for the long axis; heat transfer occurs along the direction of gas flow, and against the direction of gas flow heat transfer almost don抰 happen; during the cooling cross-flow heat transfer in the fixed bed. he wall heat transfer coefficient hw and the bed effective coefficientλb increases with the Rep of the gas and also with the gas inlet temperature. At the same time, in this paper we obtained the cooling cross-flow heat transfer relational expression in the C306 catalyst padding layer, with the conditions Tin=200～300℃, Rep=400～1100. 【关键词】固定床 冷却 错流传热 拟均相二维双参数模型 【英文关键词】fixed bed cooling cross-flow heat transfer homogeneous 2d double parameter model 【目录】固定