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氢气－燃气透平联合循环中燃气透平排气的热容大于压缩空气的热容．且远大于氢气的热容。先将燃气透平的排气分流成二股并分别预热压缩空气和氢气．再合流并加热低温氢的回热网络．与燃气透平的排气先预热压缩空气、再预热氢的回热网络比较．有效地提高了氢气透平的进气温度．从而增大了联合循环的比输出功，提高了联合循环的热效率和降低了燃料氢的耗量。本文用过程能量组合方法对两种回热网络进行了优化分析．并定量比较了采用两种优化后的回热网络的联合循环的性能。
The heat capacity of the gas turbine exhaust gas in the hydrogen-gas turbine combined cycle is greater than the heat capacity of the compressed air. And much larger than the heat capacity of hydrogen. First gas turbine exhaust split into two and preheat the compressed air and hydrogen. Reheat and heat the regenerative network of low temperature hydrogen. Exhaust with the gas turbine preheat the compressed air, and then preheat the hydrogen back to the heat network comparison. Effectively improve the intake temperature of the hydrogen turbine. Thereby increasing the specific work output of the combined cycle, increasing the thermal efficiency of the combined cycle and reducing the fuel hydrogen consumption. In this paper, two kinds of recuperation networks are optimized and analyzed by process energy combination method. And quantitatively compared the performance of the combined cycle with two optimized regenerative networks.