用于微波辅助高级氧化工艺余热回收的管壳式换热器建模与优化设计
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摘要
微波辅助高级氧化(MAOP)工艺是新型的水处理技术,利用换热器对该工艺出水中的热能进行回收具有重要意义。本研究在利用COMSOL构建的换热器数值模型基础上,研究换热器折流板缺口高度H与间距B对壳程流体流动状态和换热器性能的影响。结果表明,H和B越小,越有利于换热,但操作压力会显著增加;反之,操作压力降低,换热性能也显著下降。以壳程内径D为基准,得到H/D(Y)与B/D(X)的回归方程为Y=-0.446X 2+0.13X+0.419。
Microwave-assisted advanced oxidation process(MAOP) is a new wastewater treatment technology. The recovery of waste heat in treated effluent using heat exchanger is of important significance. Based on the numerical model of heat exchanger developed by COMSOL, the effect of baffle gap height(H) and distance(B) on fluid flow conditions in shell side and heat exchanger performance was investigated. The results show that the decrease of H and B is favorable for the heat exchange, but the pressure will increase obviously meanwhile. On the contrary, the heat exchange performance will decrease although the pressure also has the same variation trend. When the shell inner diameter(D) was used as the reference, the relationship between H/D(Y) and B/D(X) was Y=-0.446 X 2+0.113 X+0.419.
Microwave-assisted advanced oxidation process(MAOP) is a new wastewater treatment technology. The recovery of waste heat in treated effluent using heat exchanger is of important significance. Based on the numerical model of heat exchanger developed by COMSOL, the effect of baffle gap height(H) and distance(B) on fluid flow conditions in shell side and heat exchanger performance was investigated. The results show that the decrease of H and B is favorable for the heat exchange, but the pressure will increase obviously meanwhile. On the contrary, the heat exchange performance will decrease although the pressure also has the same variation trend. When the shell inner diameter(D) was used as the reference, the relationship between H/D(Y) and B/D(X) was Y=-0.446 X 2+0.113 X+0.419.
引文
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[8] Wen H G, Zhou G Y, Zhu D S, et al. Effect of Baffle Orientation on Heat Transfer Performance of Shell-and-Tube Heat Exchangers[J].Chemical Engineering(China), 2012, 40(4):23-26, 30.
[9]曾舟华,钱颂文,岑汉钊,等.管壳式换热器壳程弓形折流板传热死区流体介质滞留现象研究[J].制冷,1995,52(3):10-14.
[10]Jin M, Zhan L, Yu G X, et al. Effect of the Flow Models on the Numerical Simulation of Shell and Tube Heat Exchanger[J]. Advanced Materials Research, 2014, 1008-1009:910-913.
[2]Wang N N, Zheng T, Jiang J P, et al. Pilot-scale Treatment of p-Nitrophenol Wastewater by Microwave-enhanced Fenton Oxidation Process:Effects of System Parameters and Kinetics Study[J]. Chemical Engineering Journal, 2014, 239:351-359.
[3] Cao S, XU J L, LI Y Z, et al. Condensation Heat Transfer of R245fa in a Shell-tube Heat Exchanger at Slightly Inclined Angles[J]. International Journal of Thermal Sciences, 2017, 115:197-209.
[4] Yang J, Fan A W, Liu W, et al. Optimization of Shell-and-Tube Heat Exchangers Conforming to TEMA Standards with Designs Motivated by Constructal Theory[J]. Energy Conversion and Management, 2014, 78:468-476.
[5] Shi M Z, Wang Z Z. Principle and Design of Heat Exchanger(The Fourth Edition)[M]. Southest university press, 2009.
[6] Chen M H, Cong D Z, Fang T N, et al. Principles of Chemical Industry(Volume I, The second Edition)[M]. Chemical industry press, 1999.
[7] Wang D, Dong Q W, Liu M S. Numerical Simulation on Characteristics in Shell Side of Shell-and-Tube Heat Exchanger[J]. Journal of Nanjing University of Technology(Natural Science Edition), 2009, 31(5):52-57.
[8] Wen H G, Zhou G Y, Zhu D S, et al. Effect of Baffle Orientation on Heat Transfer Performance of Shell-and-Tube Heat Exchangers[J].Chemical Engineering(China), 2012, 40(4):23-26, 30.
[9]曾舟华,钱颂文,岑汉钊,等.管壳式换热器壳程弓形折流板传热死区流体介质滞留现象研究[J].制冷,1995,52(3):10-14.
[10]Jin M, Zhan L, Yu G X, et al. Effect of the Flow Models on the Numerical Simulation of Shell and Tube Heat Exchanger[J]. Advanced Materials Research, 2014, 1008-1009:910-913.