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

作　　者：Lei Huang Lin Qi Hongna Wang Jinli Zhang Xiaoqiang Jia 

机构地区：[1]Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University [2]Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University [3]Syn Bio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology,Tianjin University

出　　处：《Chinese Journal of Chemical Engineering》2017年第8期1101-1108,共8页中国化学工程学报（英文版）

基　　金：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);Tianjin Penglai 19-3 Oil Spill Accident Compensation Project(19-3 BC2014-03)

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 supercdtical water through the shell and tube of heat exchangers to alleviate the problems. In this paper, we discuss seven types of exchangers CA, 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 dis- tribution 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-ram inlet pipe diameter.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 

分 类 号：TQ545[化学工程—煤化学工程]