Utilization of waste heat from GTMHR for hydrogen generation via combination of organic Rankine cycles and PEM electrolysis
Utilization of waste heat from GTMHR for hydrogen generation via combination of organic Rankine cycles and PEM electrolysis
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DOI：
10.1016/j.enconman.2016.09.043
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发表时间：
2016-11
影响因子：
10.4
通讯作者：
H. Nami;F. Mohammadkhani;F. Ranjbar
中科院分区：
文献类型：
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作者：
H. Nami;F. Mohammadkhani;F. Ranjbar
对燃气涡轮机模块化氦气反应器/有机朗肯循环（GTMHR/ORC）与质子交换膜电解槽耦合制氢系统进行了能量和火用分析。进行了全面的参数研究，研究了压缩机压比、涡轮机入口温度、蒸发器温度、蒸发器夹点温差和有机朗肯循环涡轮机入口过热度等重要变量对集成系统的火用效率、产氢率和可持续性指数的影响。利用工程方程求解软件（EES），采用直接搜索法对组合系统进行优化，以获得最大（火用）效率。结果表明，随着压比的增大，联合循环与GTMHR循环的火用效率差异增大。另外，还观察到产氢率随着涡轮机入口温度的增加而增加，并且随着蒸发器温度的改变而取最大值。在优化条件下，联合系统的火用效率、产氢率和可持续性指数分别为49.21%、56.2kg/h和1.972。
Energy and exergy analyses are carried out for hydrogen production via Gas Turbine Modular Helium Reactor/Organic Rankine Cycle (GTMHR/ORC) system coupled with a proton exchange membrane electrolyzer. A comprehensive parametric study is performed and the effects of some significant variables as compressor pressure ratio, turbine inlet temperature, evaporators’ temperature, pinch point temperature difference in the evaporators and degree of superheat at the ORC turbines inlet on the exergy efficiency, rate of produced hydrogen and sustainability index of the integrated system are investigated. Using direct search method by the Engineering Equation Solver (EES) software, the combined system is optimized to achieve the maximum exergy efficiency. Results show that the exergy efficiency difference between the combined system and GTMHR cycle increases with an increase in pressure ratio. Also, it is observed that the rate of produced hydrogen increases with increasing turbine inlet temperature and takes the maximum value with change in evaporators’ temperature. Under the optimized condition, exergy efficiency, rate of the produced hydrogen and sustainability index of the proposed combined system are calculated to be 49.21%, 56.2 kg/h and 1.972, respectively.