基于光谱分频的太阳能光伏-甲烷重整互补发电系统

Hybrid Solar Power Generation System Integrating Concentrating Photovoltaics and Methane Reforming With Spectral Splitting

本文提出了基于光谱分频的太阳能光伏-甲烷重整互补发电系统。太阳光经聚光装置汇聚至光谱分频器表面,并被按波长不同分为两部分,其中短波部分经光伏电池利用发电,长波部分经甲烷湿重整反应器吸收并转换为合成气中的化学能,后经燃气蒸汽联合循环发电。热力学分析表明,在重整温度为800℃时,互补发电系统的太阳能净发电效率最高达到37.1%(已考虑光学损失),高于相应的太阳能光伏发电系统(28.0%)与太阳能甲烷重整发电系统(850℃,26.5%);通过太阳光谱分频以及光伏-热化学互补耦合,实现太阳能品位对口、梯级利用;互补发电系统中部分能量可通过合成气形式储存,解决光伏部分难以储能的问题,提高系统供能的稳定性和持续性,并显著降低对化石能源的依赖度。本文基于光谱分频技术提出的太阳能光伏与甲烷重整互补发电系统,达到了太阳能全光谱综合利用的目的,为太阳能的高效利用提供了新的思路。

A hybrid solar power generation system integrating concentrating photovoltaics and methane reforming with spectral splitting has been proposed. The concentrated sunlight is divided into two parts according to their different responses to spectrum, among which the short-wavelength part is distributed to the photovoltaics for power generation, and the long-wavelength part is absorbed by the methane steam reforming reactor and converted to chemical energy, which is fed to gas steam combined cycle for power generation. Thermodynamic analyses show that the maximum net solar-electric efficiency of the hybrid system reaches up to 37.1% at the temperature of 800℃(optical loss is considered), which is significantly higher than the efficiency of 28.0% of solar PV-only system and solar methane reforming-only system(850℃, 26.5%). Matching in energy level and cascaded utilization of energy are realized through solar spectral splitting and photovoltaics-thermochemistry coupling;energy of the hybrid system can be stored partially as chemical energy in syngas in order to address the difficulty of energy storage of PV modules, which enhances the stability and continuity of power output of the hybrid system, and significantly decreases dependence on fossil fuels. The power generation system enabled by complementation between photovoltaics and methane steam reforming based on spectral splitting as proposed in this work achieves the goal of comprehensive utilization of the full solar spectrum, and offers a new method for the effective utilization of solar energy.