【摘要】 利用可再生能源,有望进一步提升分布式能量系统的热力性能,降低对化石能源的依赖,从而降低碳排放。本文基于污水处理厂的用能情况,提出一种沼气和太阳能互补的新型分布式能源系统。相比于沼气直接燃烧利用,沼气在新系统中首先参与沼气重整过程,吸收聚集的太阳能转变为更高热值的合成气,进而在冷热电子系统中进行利用。新系统实现了沼气的间接燃烧,减少了沼气燃烧过程的不可逆损失,实现了太阳能品位的提升和化学储存。本文建立了该新系统的动态热力过程模型,以西藏拉萨作为参考地域,得到了系统全年的热力性能。研究表明:相比于沼气和太阳能单独利用系统,新系统多生产299.3 MWh(7%)电能和58.7 MWh(54.9%)冷能,每年节省16340 m3(标况)(11.7%)天然气。本研究为沼气高效利用提供了一种新型技术方案。更多还原

【Abstract】 Using renewable energy has potential to improve the performance of the distributed energy systems, as a result of which, it can reduce the consumption of the fossil fuels and ease the greenhouse effect. This study proposes a new distributed energy system assisted by biogas and solar energy based on sewage treatment plants. Compared with the conventional way of using biogas, the biogas participates in a reforming reaction, and converts into the syngas with the aid of solar heat in the new system. The syngas is then used in a high-efficient CCHP subsystem. This new method realizes the indirect use of biogas and energy quality improvement of the solar energy, thus reduce the irreversible loss of the combustion process. The hourly dynamic simulations of the proposed systems were conducted by the established mathematic models under Tibet Lhasa weather data. Compared with the separate utilization systems for biogas and solar energy, the new system annually produces299.3 MWh(7%) more power, 58.7 MWh(54.9%) more refrigeration, and saves 16340 m3(11.7%)natural gas. This study provides a new way to efficiently use the biogas.更多还原