控制CO_2的太阳能/甲烷互补系统热力经济性研究

The Study on the Solar/Methane Hybrid Power Generation System With Low Energy-Penalty CO_2 capture

基于多能源互补综合梯级利用的原则,本文提出了新型低能耗控制CO_2的太阳能与甲烷互补系统(LEHSOLCC),并对其进行了热力经济性分析。钯基合金膜具有很高的透氢性能,将此结构用于甲烷重整反应中,在中温条件下可实现甲烷的近完全转化,并在能量转化的同时,实现CO2的定向富集与低能耗分离。所提系统中,中温太阳能(550℃)首先经重整反应转化为合成气化学能,实现品位提升,其次通过燃料燃烧转化为高温燃气热能驱动燃气-蒸汽联合循环作功实现其高效热功转换。分析表明:额定工况下,系统发电成本为0.062$/kWh,回收期10年。与相同化石燃料输入及CO_2捕集水平的尾气捕集CO2的燃气-蒸汽联合循环(CC-Post)相比,发电成本降低11.4%,充分显示其性能优势。

Based on the principle of cascade utilization of multiple energy resources, a gas-steam combined cycle power system integrated with solar thermo-chemical fuel conversion and CO2 capture has been proposed and analyzed. The collected solar heat at 550℃ drives the endothermic methane reforming and is converted to the produced syngas chemical exergy, and then released as high-temperature thermal energy via combustion for power generation, achieving its high-emciency heat-power conversion. The reforming reaction is integrated with a Pd-based hydrogen separation membrane, which continuously withdraws hydrogen from the reaction zone and enables nearly full methane conversion. The CO2 enriched gas being concentrated in the retentate zone is collected and processed with pre-combustion decarbonization. The results from preliminary economic analysis show that the cost of electricity is 0.062 S/kWh, 11.4% lower than that in the reference system with the same methane input and CO2 removal ratio, and payback period is 10 years.