YAO Xiuying¹，XU Bo^1,2，LU Chunxi¹，LIU Mengxi¹

(1.State Key Laboratory of Heavy Oil Processing,China University of Petroleum-Beijing,Beijing 102249，China;2.Dongfang Boiler Group Co.,Ltd.,Zigong 643001，China)

Abstract:Geometric modeling and meshing were carried out for one side of turbulent bed which has a heat exchanger with inclined heat pipes.Two-fluid model coupled with energy minimization multi-scale (EMMS) drag model was used to verify the model.The axial and radial distribution of particle axial velocity and the particle velocity distribution on the surface of heat pipe were studied and the heat transfer performance on heat pipe surface was analyzed.The results show that the heat pipe can restrict the upward movement of bubbles in the turbulent bed,which increases the time-averaged particle velocity under the heat pipe region.In the heat exchanger,the bubbles move upward through the heat pipe along S-shaped route,that is,the bubbles move upward from the free end of heat pipe at the height of the heat pipe and upward through the center of bed in the area between heat pipes.The lower surface of the free end of the heat pipe and its upper surface of the constrained end are called as the characteristic heat transfer areas of the inclined heat pipe,where the particles move upward across tube wall.This movement indicates the inclined arrangement of the heat pipe can strengthen the renewal speed of the particles and promote the bed-to-tube heat transfer.The particle velocity is proposed to analyze the heat transfer performance on heat pipe surface.The dimensionless radius of the efficient heat exchange zone is from -0.8 to -0.3.The heat transfer performance increases first and then keeps the constant with the gas velocity,and the gas velocity corresponding to the turning point is 0.7 m/s.With the increase of the axial height,the heat transfer performance of the heat pipe first decreases and then increases,and the bottom heat pipe has the best heat transfer performance.

Keywords:inclined heat pipe surface;heat exchanger;turbulent fluidized bed;particle flow;heat transfer performance

中图分类号： TE624                            文献标志码：A

文章编号：1008-5548(2022)04-0001-13

DOI:10.13732/j.issn.1008-5548.2022.04.001

收稿日期： 2021-12-28， 修回日期：2022-04-26，在线出版时间：2022-05-13。

基金项目：国家自然科学基金委创新群体项目，编号：22021004；国家自然科学基金项目，编号：91834303。

第一作者简介：姚秀颖(1985—)，女，讲师，博士，硕士生导师，研究方向为多相流传递与反应。E-mail：xyyao2014@126.com。

通信作者简介：卢春喜(1962—)，男，教授，博士，博士生导师，研究方向为石油化工装备。E-mail：lcx725@sina.com。