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在分析基本联合循环的基础上,提出了氢-氧联合循环系统,分析了影响氢-氧联合循环效率的主要因素.结果表明:随着最高温度和最高压力的提高,循环的热效率也不断提高,在温度为1700℃、压力为30 MPa时,效率可达到62%;中压燃气透平的膨胀比以及膨胀比的分配都存在1个最佳值,在温度为1 500℃、压力为30 MPa时,中压燃气透平最佳膨胀比为8.0左右,效率可达到60.5%,此时最佳膨胀比分配值为1.43;最佳膨胀比的分配在亚临界区域随着总膨胀比的升高而降低,在超临界区域随着总膨胀比的提高先降低后升高,在总膨胀比为30左右的时候出现拐点;通过对回热和再热系统参数的优化,氢-氧联合循环可以达到更高的热效率.
Based on the analysis of the basic combined cycle, the hydrogen-oxygen combined cycle system was proposed and the main factors influencing the efficiency of hydrogen-oxygen combined cycle were analyzed. The results showed that the thermal efficiency of the cycle increased with the increase of the maximum temperature and the maximum pressure , At a temperature of 1700 ℃, a pressure of 30 MPa, the efficiency can reach 62%; medium pressure gas turbine expansion ratio and the distribution of the expansion ratio there is an optimal value at a temperature of 1500 ℃, the pressure is 30 MPa, the optimal expansion ratio of the medium pressure gas turbine is about 8.0, the efficiency can reach 60.5%, and the optimum expansion ratio distribution value at this time is 1.43. The distribution of the optimal expansion ratio is in the subcritical region with the total expansion ratio High and low in the supercritical region with the increase of the total expansion ratio first decreased and then increased, the total expansion ratio of about 30 when the inflection point; through the optimization of the parameters of the regenerative and reheat system, hydrogen-oxygen combined cycle Higher thermal efficiency can be achieved.