基于柴油-蒸汽重整的化学回热循环热力计算

Thermodynamic Calculation of Chemically Recuperated Gas Turbine Based on Diesel-Steam Reforming

关键词:  柴油-蒸汽重整  最小吉布斯自由能  化学回热循环燃气轮机  节能减排

Key words:  Diesel-steam reforming  Minimization of Gibbs free energy  Chemically recuperated gas turbine  Energy saving and emission reduction

摘要:

为了推进化学回热循环燃气轮机应用于船舶推进系统，应用最小吉布斯自由能法建立柴油-蒸汽重整反应计算模型并基于此模型分析化学回热循环燃气轮机的热力性能。使用甲烷-蒸汽重整反应结果验证该方法的可行性，计算结果和实验对比主要产物产量最大误差为3.44%。使用该方法计算柴油-蒸汽重整反应，计算后燃料折合热值提高了38.9%；循环效率得到提升。根据柴油-蒸汽重整反应计算结果计算了燃机的燃烧室出口温度为1375.3K，较简单循环的1542.8K降低了167.5K，较低的燃烧温度可以降低NO_x的生成量。经过验证，在所选定的计算状态，烟气余热能量足够产生系统所需的水蒸汽。

Abstract:

Aiming at forming the foundation of the chemically recuperated gas turbine (CRGT) being applied in the marine propulsion，the minimization of Gibbs free energy method was applied to calculate diesel-steam reforming and thermodynamic performance of the CRGT was evaluated based on this method. The minimization of Gibbs free energy method was used to calculate methane-steam reforming and the highest differences was 3.44% contrast to experiment，which proves the accuracy of this method. Then，the diesel-steam reforming was calculated by this method and the heat value of the reformed fuel was 38.9% higher，indicating that the CRGT has a higher thermal efficiency. And the outlet temperature of combustor in the CRGT based on some gas turbine was 1375.3K，167.5K lower than 1542.8K of the simple cycle，which leads to low NO_x emission. It is also illustrated that the energy of exhaust gas out of the reformer can produce enough steam for the CRGT.