Optimal design of heat exchanger header for coal gasification in supercritical water through CFD simulations

doi:10.1016/j.cjche.2017.03.017

›› 2017, Vol. 25 ›› Issue (8): 1101-1108.DOI: 10.1016/j.cjche.2017.03.017

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Optimal design of heat exchanger header for coal gasification in supercritical water through CFD simulations

Lei Huang¹, Lin Qi¹, Hongna Wang¹, Jinli Zhang^2,3, Xiaoqiang Jia^1,2,3

1 Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 Key Laboratory of Systems Bioengineering(Ministry of Education), Tianjin University, Tianjin 300072, China;
3 SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Received:2016-09-20 Revised:2017-01-23 Online:2017-09-11 Published:2017-08-28
Supported by:
Supported by the National Basic Research Program of China (2014CB745100), the National Natural Science Foundation of China (21576197), Tianjin Research Program of Application Foundation and Advanced Technology (14JCQNJC06700), and Tianjin Penglai 19-3 Oil Spill Accident Compensation Project (19-3 BC2014-03).

Optimal design of heat exchanger header for coal gasification in supercritical water through CFD simulations

Lei Huang¹, Lin Qi¹, Hongna Wang¹, Jinli Zhang^2,3, Xiaoqiang Jia^1,2,3

1 Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 Key Laboratory of Systems Bioengineering(Ministry of Education), Tianjin University, Tianjin 300072, China;
3 SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

通讯作者: Xiaoqiang Jia
基金资助:
Supported by the National Basic Research Program of China (2014CB745100), the National Natural Science Foundation of China (21576197), Tianjin Research Program of Application Foundation and Advanced Technology (14JCQNJC06700), and Tianjin Penglai 19-3 Oil Spill Accident Compensation Project (19-3 BC2014-03).

Abstract

Abstract: Heat exchangers play an important role in supercritical water coal gasification systems for heating feed and cooling products. However, serious deposition and plugging problems always exist in heat exchangers. CFD modeling was used to simulate the transport characteristics of solid particles in supercritical water through the shell and tube of heat exchangers to alleviate the problems. In this paper, we discuss seven types of exchangers (A, B, C, D, E, F and G), which vary in inlet nozzle configuration, header height, inlet pipe diameter and tube pass distribution. In the modeling, the possibility of deposition in the header was evaluated by accumulated mass of particles; we used the velocity contour of supercritical water (SCW) to evaluate the uniformity of the velocity distribution among the tube passes. Simulation results indicated that the optimum heat exchanger had structure F, which had a rectangular configuration of tube pass distractions, a bottom inlet, a 200-mm header height and a 10-mm inlet pipe diameter.

Key words: Supercritical water, Shell and tube heat exchanger, Particle conveying, Pneumatic transport, CFD simulations, CFX

摘要： Heat exchangers play an important role in supercritical water coal gasification systems for heating feed and cooling products. However, serious deposition and plugging problems always exist in heat exchangers. CFD modeling was used to simulate the transport characteristics of solid particles in supercritical water through the shell and tube of heat exchangers to alleviate the problems. In this paper, we discuss seven types of exchangers (A, B, C, D, E, F and G), which vary in inlet nozzle configuration, header height, inlet pipe diameter and tube pass distribution. In the modeling, the possibility of deposition in the header was evaluated by accumulated mass of particles; we used the velocity contour of supercritical water (SCW) to evaluate the uniformity of the velocity distribution among the tube passes. Simulation results indicated that the optimum heat exchanger had structure F, which had a rectangular configuration of tube pass distractions, a bottom inlet, a 200-mm header height and a 10-mm inlet pipe diameter.

关键词: Supercritical water, Shell and tube heat exchanger, Particle conveying, Pneumatic transport, CFD simulations, CFX

Lei Huang, Lin Qi, Hongna Wang, Jinli Zhang, Xiaoqiang Jia. Optimal design of heat exchanger header for coal gasification in supercritical water through CFD simulations[J]. , 2017, 25(8): 1101-1108.

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Optimal design of heat exchanger header for coal gasification in supercritical water through CFD simulations

Optimal design of heat exchanger header for coal gasification in supercritical water through CFD simulations

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