户用辅助加热式太阳能沼气池系统研究

Study of the Household Solar Energy Biogas Digester System with Auxiliary Electric Heater

北方地区冬季温度较低出现沼气池产气量少甚至不产气的问题,严重制约着沼气池在农村的应用与推广,逐渐兴起的太阳能沼气池法受到人们的关注和重视。由于太阳能集热器只能在有日照的白天进行储能,为保证沼气池正常连续高效的运行,一种含辅助电加热器的户用太阳能沼气池系统被提出,文章介绍了系统的组成和工作原理,根据k-ε湍流模型与相应的计算网络及边界条件对沼气池进行了二维定常数值仿真,并进行了实验观测从而验证了该系统的合理性。最后又从经济角度阐述了它的可行性。

Due to the low temperature in winter, the biogas fermentation being influenced, the gas production will decrease,or there may produce no biogas, which seriously restricts the application and development of bio-gas digesters. The solar energy biogas digester causes more and more concern and attention, solar collectors only operates during the sunlight in the daytime. The household solar energy biogas digester system with auxiliary electric heater was put forward to ensure efficient operation. The composition and working principle of the system were explained, the two-dimensional steady numerical simulation of heating process in biogas digesters were carried on by using computational fluid dynamics（CFD）,the multi-reference frame（MRF）and standard k-ε turbulent model. At the same time,experimental observation was made to validate the rationality of the system. Finally, the feasibility of the system was explained from an economic point of view.