抛物面碟式太阳能接收器与高温反应器的联合传热特性分析
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摘要
太阳能接收器和反应器的几何结构直接影响其传热特性及化学反应过程,利用光学特性产生高强度辐射通量是营造高温的常用方法。构造了一种基于抛物面碟式太阳能接收器的高温反应器,分为预热区和多孔反应区,通过COMSOL Metaphysics软件建立其三维数值模型,计算焦平面热通量分布规律,在典型运行条件下(DNI=800 W/m~2,u_(in)=0.1 m/s),分析反应器的速度和温度分布规律,以及DNI和反应流体入口速度对反应器传热特性的影响。
The geometrical structure of solar receiver and reactor directly influences the heat transfer characteristics and chemical reaction process,The use of optical characteristics to produce high intensity radiation flux is a common method of building high temperature.In this research,a high temperature reactor based on parabolic dish solar receiver is constructed,which is divided into preheating zone and porous reaction zone.A three-dimensional numerical model of parabolic dish solar receiver and reactor is built by COMSOL Metaphysics software to analyze the distribution law of heat flux in coke plane,the velocity and temperature distribution of reactor under typical operating conditions(DNI=800 W/m~2),and the influence of reaction fluid inlet velocity and DNI on heat transfer characteristics of reactor.The results will help to explore the efficient use of solar energy and high temperature chemical reactions.
The geometrical structure of solar receiver and reactor directly influences the heat transfer characteristics and chemical reaction process,The use of optical characteristics to produce high intensity radiation flux is a common method of building high temperature.In this research,a high temperature reactor based on parabolic dish solar receiver is constructed,which is divided into preheating zone and porous reaction zone.A three-dimensional numerical model of parabolic dish solar receiver and reactor is built by COMSOL Metaphysics software to analyze the distribution law of heat flux in coke plane,the velocity and temperature distribution of reactor under typical operating conditions(DNI=800 W/m~2),and the influence of reaction fluid inlet velocity and DNI on heat transfer characteristics of reactor.The results will help to explore the efficient use of solar energy and high temperature chemical reactions.
引文
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[2]Jeter S M.The distribution of concentrated solar radiation in parabola ideal collectors[J].Journal of Solar Energy Engineering,1986,108:219-225.
[3]Stephane A,Gilles F.Solar hydrogen production from the thermal splitting of methane in a high temperature solar chemical reactor[J].Solar Energy,2006,80(10):1321-1332.
[4]彭可武,吴文远,徐玉,等.B4C和Al在高温条件下的化学反应[J].稀有金属与硬质合金,2008,36(1):16-19.PENG Kewu,WU Wenyuan,XU yu,et al.Chemical reactions of B4Cand Al under high temperature conditions[J].Rare Metals and Cemented Carbides,2008,36(1):16-19.(in Chinese)
[5]Sendhil K N,Reddy K S,Kumar N,et al.Comparison of receivers for solar dish collector system[J].Energy Convers Manage,2008,49:812-819.
[6]Xiao X,Zhang P,Shao D D,et al.Experimental and numerical heat transfer analysis of a V-cavity absorber for liner parabolic trough solar collector[J].Energy Conversion and Management,2014,86:49-59.
[7]Odeh S D,Morrison G L,Behnia M.Modelling of parabolic trough direct steam generation solar collectors[J].Solar Energy,1998,62:395-406.
[8]Reddy K S,Sendhil N.Combined laminar natural convection and surface radiation heat transfer in a modified cavity receiver of solar parabolic dish[J].International Journal of Thermal Sciences,2008,47(12):1647-1657.
[9]Heinzel V,Kungle H,Simon M.Simulation of a parabolic trough collector[J].ISES Solar World Congress,Harare,Zimbabwe,1-10,1995.
[10]Samareh B,Yagoubi M.Two dimensional numerical simulation of the turbulent wind flow around a large parabolic solar collector[M].Korea:Proceedings of Apcwevi,151,2005.
[11]Cheng Z D,He Y L,Xiao J,et al.There-dimensional numerical study of heat transfer characteristics in the receiver tube of parabolic trough solar collector[J].International Communications in Heat and Mass Transfer,2010,37:782-787.