Engineering design of solar and power waste energy heating system for biogas project

Biogas projects have been rapidly developed in China due to their energy efficiency and environmental benefit. So far many biogas projects only operate stably in Southern China. Because the thermal insulation in this region cannot support the biogas fermentation. In this study, a set of heating system that composed of solar and power waste energy were tested. This technology was demonstrated for a middle temperature fermentation project in Harbin Shuangcheng city. The design principle is discussed in this paper. Some key parameters including fermentation heat load, generator heat recovery utilization rate, and thermal efficiency of solar collector unit were calculated theoretically to verify whether this heating system can meet the middle temperature condition. The combined heating system in this biogas project can reduce the investment system. It is expected that this paper will assist designing a heating system to for the stable operation of biogas projects in Northern China.