金属氢化物热泵反应器吸氢过程的温度变化特性
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摘要
为了研究金属氢化物反应器的温度变化趋势与规律,搭建了反应器性能测试装置,通过实验获得了吸氢反应过程中氢化物床层和换热流体的温度变化数据。实验结果表明:床层最高温度和换热流体出口温度都随着供氢压力的增大而升高。当供氢压力从0.6MPa提高到1.0MPa时,床层最高温度从56.6℃提高到71.8℃。考虑到经济性与安全性等问题,对于镧基金属氢化物反应器其供氢压力最好限定在1.6MPa以下。换热流体流量越大则床层温度下降得越快,但其强化效果有限。流体出口温度升高幅度则随着流量增大而显著降低,但床层最高温度几乎无变化。氢气注入流量越大,反应器内氢气压力升高得越快,相应地氢化反应越快。通过改变氢气流量可以控制放热反应过程,从而更好地适应用热需求。
In order to study the temperature variation of metal hydride heat pump reactor,an experimental setup for performance test of the heat pump reactor was built.The temperature variation of the hydride bed and heat transfer fluid in hydrogen adsorption reaction was measured.The experimental results show that both the maximum temperature of the hydride bed and outlet temperature of heat transfer fluid rise with the increase of the hydrogen supply pressure.When the hydrogen supply pressure increases from 0.6MPa to 1.0MPa,the maximum temperature of the bed rises from 56.6to 71.8℃.Considering cost and safety,hydrogen supply pressure should be lower than 1.6 MPa for La-based metal hydride reactor.The higher the flow rate of heat transfer fluid is,the faster the bed temperature drops,but this heat transfer enhancement effect is very limited.When the fluid flow rate increases,the temperature rising magnitude of the fluid reduces remarkably,while the maximum temperature of the bed basically keeps unchanged.It can also be found that the higher the hydrogen injection flow rate is,the faster the hydrogen pressure in the reactor rises,resulting in faster hydrogenation reaction.The exothermic reaction process can be controlled by changing the hydrogen flow rate,thus more favorably meeting the demand for heat application.
In order to study the temperature variation of metal hydride heat pump reactor,an experimental setup for performance test of the heat pump reactor was built.The temperature variation of the hydride bed and heat transfer fluid in hydrogen adsorption reaction was measured.The experimental results show that both the maximum temperature of the hydride bed and outlet temperature of heat transfer fluid rise with the increase of the hydrogen supply pressure.When the hydrogen supply pressure increases from 0.6MPa to 1.0MPa,the maximum temperature of the bed rises from 56.6to 71.8℃.Considering cost and safety,hydrogen supply pressure should be lower than 1.6 MPa for La-based metal hydride reactor.The higher the flow rate of heat transfer fluid is,the faster the bed temperature drops,but this heat transfer enhancement effect is very limited.When the fluid flow rate increases,the temperature rising magnitude of the fluid reduces remarkably,while the maximum temperature of the bed basically keeps unchanged.It can also be found that the higher the hydrogen injection flow rate is,the faster the hydrogen pressure in the reactor rises,resulting in faster hydrogenation reaction.The exothermic reaction process can be controlled by changing the hydrogen flow rate,thus more favorably meeting the demand for heat application.
引文
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[2]YASUDA N,TSUCHIYA T,SASAKI S,et al.Selfignition combustion synthesis of LaNi5at different hydrogen pressures[J].International Journal of Hydrogen Energy,2011,36(14):8604-8609.
[3]YANG F S,WANG G X,ZHANG Z X,et al.Investigation on the influences of heat transfer enhancement measures in a thermally driven metal hydride heat pump[J].International Journal of Hydrogen Energy,2010,35(18):9725-9735.
[4]SEKHAR B S,LOTOTSYKK M,KOLESNIKOV A,et al.Performance analysis of cylindrical metal hydride beds with various heat exchange options[J].Journal of Alloys and Compounds,2015,645(S1):S89-S95.
[5]YANG F S,ZHANG Z X,BAO Z W.An extensive parametric analysis on the performance of a singlestage metal hydride heat transformer[J].International Journal of Hydrogen Energy,2012,37(3):2623-2634.
[6]SEKHAR B S,MUTHUKUMAR P.Thermal modeling and performance investigation of a double-stage metal hydride-based heat transformer[J].Numerical Heat Transfer:Part A,2015,67(8):883-901.
[7]SEKHAR B S,MUTHUKUMAR P.Performance tests on a double-stage metal hydride based heat transformer[J].International Journal of Hydrogen Energy,2013,38(35):15428-15437.
[8]鲍泽威,杨福胜,吴震,等.金属氢化物反应器吸氢过程的热质传递特性分析[J].西安交通大学学报,2012,46(9):49-54.BAO Zewei,YANG Fusheng,WU Zhen,et al.Analysis on heat and mass transfer characteristics of metal hydride reactors during adsorption[J].Journal of Xi’an Jiaotong University,2012,46(9):49-54.
[9]覃峰.新型稀土系储氢合金的粉化、膨胀和传热特性的研究[D].上海:上海交通大学,2007.
[10]KIM K J,FELDMAN K T,LLOYD G,et al.Performance of high power metal hydride reactors[J].International Journal of Hydrogen Energy,1998,23(5):355-362.
[11]杨福胜.金属氢化物热泵反应器的性能模拟研究[D].西安:西安交通大学,2006.
[12]HAHNE E,KALLWEIT J.Thermal conductivity of metal hydride materials for storage of hydrogen:experimental investigation[J].International Journal of Hydrogen Energy,1998,23(2):107-114.
[13]杨世铭,陶文铨.传热学[M].4版.北京:高等教育出版社,2006.