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本文提出了中低温太阳热能品位间接提升的概念、方法和系统集成,其核心是热集成和热化学转换的有机结合。在所提出的太阳能和化石能源综合互补的化学回热循环系统(SOLRGT)中,中低温太阳热能首先提供蒸汽蒸发潜热从而转化为蒸汽内能;其次通过蒸汽参与重整反应进一步转化为合成气化学能,实现品位提升;最后得以在高效的燃气轮机系统中实现热功转换。由于太阳能的引入,燃气轮机透平排气余热回收部分的热匹配得到极大改善,并减少了化石能源消耗;同时,蒸汽产率的增加有助于增进系统化学回热和物理回热收益。系统中太阳能热转功净效率可达26.5%;和常规化学回热循环相比,化石能源节约率可达20%～30%,实现相应数量的CO_2减排,系统中实现了中低温太阳能的高效热功转换和与化石燃料的梯级互补。
In this paper, the concept, method and system integration of indirect upgrading of mid-low temperature solar thermal energy grade are put forward. Its core is the organic combination of thermal integration and thermochemical conversion. In the proposed SOLRGT system, solar energy and fossil fuels are integrated with each other, and the low and medium temperature solar heat firstly provides the latent heat of steam evaporation to be converted into the steam internal energy. Secondly, steam is further involved in the reforming reaction to be converted into syngas chemistry Can, achieve grade improvement; Finally, in the efficient gas turbine system to achieve thermal conversion. Due to the introduction of solar energy, the thermal matching of exhaust gas heat recovery part of gas turbine turbine has been greatly improved, and the fossil energy consumption has been reduced. At the same time, the increase of steam yield can help increase the chemical heat recovery and the physical heat recovery benefit. The net efficiency of solar thermal transfer in the system can reach 26.5%. Compared with the conventional chemical heat-recovery cycle, the energy saving rate of fossil energy can reach 20% -30%, and the corresponding amount of CO 2 emission reduction can be achieved. In this system, the low- Efficient thermal conversion and cascade with fossil fuels.