催化重整条件下碳氢燃料热裂解与换热

针对碳氢燃料在再生冷却通道内的热裂解和催化重整反应过程,考虑燃料在超临界压力下的热物性,建立了超临界压力下的流动、换热和反应模型,开展了流动换热、热裂解和催化重整反应的耦合数值研究。结果表明:计算结果与实验吻合良好,能较为准确地预测壁面和燃油温度、燃料转化率和换热恶化等现象。催化重整反应能显著提高燃料的吸热能力,降低出口温度,同时还能抑制热裂解反应的发生。增大流量会降低燃料在通道内的停留时间,降低燃料的转化率和化学反应吸热量。 

Thermal cracking and heat transfer of hydrocarbon fuel with catalytic steam reforming

For the thermal cracking and steam reforming reactions of hydrocarbon fuel in regenerative cooling channel, a numerical model coupling with flow, heat transfer and chemical reaction was established to investigate the heat absorbing and reaction properties of hydrocarbon fuel, taking thermo-physical properties under supercritical pressure into consideration. Results showed that, the calculated results were in good agreement with experimental data. The numerical model can predict the wall and fuel temperature distribution, fuel conversion and heat transfer deterioration phenomenon. Fuel with catalytic steam reforming had the advantages of heat sink promotion and lower outlet temperature. Thermal cracking reaction can be inhibited by the existence of steam reforming reactions. The analysis of fuel mass flow rate showed that residence time of the fuel decreased with the increasing mass flow rate, resulting in a lower conversion and chemical heat sink of the hydrocarbon fuel.