太阳能驱动沼气重整的分布式供能系统热力性能研究

Study on Thermal Performance of Distributed Energy Supply System for Biogas Reforming Driven by Solar Energy

沼气直燃利用存在因?损失严重而造成其利用效率低的问题。太阳能热利用存在效率低、储热难、供热不稳定的问题。为了提高分布式供能系统中能源利用的转换效率以及沼气和太阳能的利用水平,提出了一种太阳能驱动沼气重整的分布式供能系统,所聚集的高温太阳能用于重整反应的发生,在大幅提升燃料总热值的同时,还将大量太阳能的热能品位提升至合成气的化学能品位。模拟表明:设计点工况下,相同的能量输入,该系统发电量比沼气冷热电联供系统和太阳能碟式斯特林发电系统多4.59%,碟式太阳能净发电效率可达32%。

The utilization of direct combustion of biogas has the problem of low utilization efficiency due to the serious exergic loss.The utilization of solar heat has the problems of low efficiency,difficult heat storage and unstable heating.In order to improve the conversion efficiency of energy utilization and the utilization level of biogas and solar energy in distributed power supply system,this paper proposes a solar-powered methane reforming of the distributed power system,gathered by the high temperature solar energy used in the reforming reaction,the surge of the gross calorific value of fuel at the same time,will also be a large number of solar thermal energy grade up to the grade of the chemical energy of syngas.The simulation shows that under the design conditions,the power generation of the system is 4.59% more than that of biogas cogeneration system and solar disk Stirling power generation system under the same energy input,and the net power generation efficiency of solar disk can reach 32%.