Numerical Simulation of Gas-Solid Two-Phase Heat Transfer in a Kaolin Cyclone Cooling System

The kaolin suspension calcination technology is currently gaining attention as a new process of calcining kaolin. In this paper, the cooling system of the kaolin suspension calcination process designed by CBMI Construction Co., Ltd. is simulated using ANSYS Fluent software to analyze the velocity fi...

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Main Authors: Shuai Xu, Junlin Xie, Shuxia Mei, Feng He, Runguo Li, Yuhua Deng, Chao Zhang, Xianming Zheng
Format: Article
Language:English
Published: MDPI AG 2023-04-01
Series:Energies
Subjects:
Online Access:https://www.mdpi.com/1996-1073/16/9/3744
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author Shuai Xu
Junlin Xie
Shuxia Mei
Feng He
Runguo Li
Yuhua Deng
Chao Zhang
Xianming Zheng
author_facet Shuai Xu
Junlin Xie
Shuxia Mei
Feng He
Runguo Li
Yuhua Deng
Chao Zhang
Xianming Zheng
author_sort Shuai Xu
collection DOAJ
description The kaolin suspension calcination technology is currently gaining attention as a new process of calcining kaolin. In this paper, the cooling system of the kaolin suspension calcination process designed by CBMI Construction Co., Ltd. is simulated using ANSYS Fluent software to analyze the velocity field and temperature field of the gas–solid two-phase flow using the Eulerian model. A compiled UDF (User-Defined Function) is used to simulate the transfer of mass and heat from the downcomer tube to the different elements. The gas, coming from the gas outlet of the cyclone, enters the next level twin-cylinder cyclone in a spiral state. The results show that the airflow in the cyclone consists of an external spiral flow from the top to the bottom and an internal spiral flow from the bottom to the top. During the downward movement of the airflow, the outer spiral flow is continuously transformed into an inner cyclonic flow. The part of the airflow that rotates close to the inner cylinder is likely to become a ‘short circuit flow’, which largely affects the separation efficiency and cooling effect of the cyclone. There is evident temperature deviation and flow deviation in the twin-cylinder cyclone, which is primarily due to the high cooling air volume and high rotation of air flow coming from the gas outlet of the previous level’s cyclone. The rotation of the air flow is the main cause of the bias temperature and bias flow phenomenon in the twin-cylinder cyclone.
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spelling doaj.art-191ddb1851d64fbab19aa4c127a6a3dd2023-11-17T22:51:09ZengMDPI AGEnergies1996-10732023-04-01169374410.3390/en16093744Numerical Simulation of Gas-Solid Two-Phase Heat Transfer in a Kaolin Cyclone Cooling SystemShuai Xu0Junlin Xie1Shuxia Mei2Feng He3Runguo Li4Yuhua Deng5Chao Zhang6Xianming Zheng7School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, ChinaSchool of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, ChinaSchool of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, ChinaSchool of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, ChinaCBMI Construction Co., Ltd., Beijing 100176, ChinaCBMI Construction Co., Ltd., Beijing 100176, ChinaCBMI Construction Co., Ltd., Beijing 100176, ChinaCBMI Construction Co., Ltd., Beijing 100176, ChinaThe kaolin suspension calcination technology is currently gaining attention as a new process of calcining kaolin. In this paper, the cooling system of the kaolin suspension calcination process designed by CBMI Construction Co., Ltd. is simulated using ANSYS Fluent software to analyze the velocity field and temperature field of the gas–solid two-phase flow using the Eulerian model. A compiled UDF (User-Defined Function) is used to simulate the transfer of mass and heat from the downcomer tube to the different elements. The gas, coming from the gas outlet of the cyclone, enters the next level twin-cylinder cyclone in a spiral state. The results show that the airflow in the cyclone consists of an external spiral flow from the top to the bottom and an internal spiral flow from the bottom to the top. During the downward movement of the airflow, the outer spiral flow is continuously transformed into an inner cyclonic flow. The part of the airflow that rotates close to the inner cylinder is likely to become a ‘short circuit flow’, which largely affects the separation efficiency and cooling effect of the cyclone. There is evident temperature deviation and flow deviation in the twin-cylinder cyclone, which is primarily due to the high cooling air volume and high rotation of air flow coming from the gas outlet of the previous level’s cyclone. The rotation of the air flow is the main cause of the bias temperature and bias flow phenomenon in the twin-cylinder cyclone.https://www.mdpi.com/1996-1073/16/9/3744cyclonenumerical simulationheat transferEulerian modelkaolin suspension calcination technologycooling systems
spellingShingle Shuai Xu
Junlin Xie
Shuxia Mei
Feng He
Runguo Li
Yuhua Deng
Chao Zhang
Xianming Zheng
Numerical Simulation of Gas-Solid Two-Phase Heat Transfer in a Kaolin Cyclone Cooling System
Energies
cyclone
numerical simulation
heat transfer
Eulerian model
kaolin suspension calcination technology
cooling systems
title Numerical Simulation of Gas-Solid Two-Phase Heat Transfer in a Kaolin Cyclone Cooling System
title_full Numerical Simulation of Gas-Solid Two-Phase Heat Transfer in a Kaolin Cyclone Cooling System
title_fullStr Numerical Simulation of Gas-Solid Two-Phase Heat Transfer in a Kaolin Cyclone Cooling System
title_full_unstemmed Numerical Simulation of Gas-Solid Two-Phase Heat Transfer in a Kaolin Cyclone Cooling System
title_short Numerical Simulation of Gas-Solid Two-Phase Heat Transfer in a Kaolin Cyclone Cooling System
title_sort numerical simulation of gas solid two phase heat transfer in a kaolin cyclone cooling system
topic cyclone
numerical simulation
heat transfer
Eulerian model
kaolin suspension calcination technology
cooling systems
url https://www.mdpi.com/1996-1073/16/9/3744
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