Experiment of combined warming system with solar energy and biogas boiler in cold areas

To develop and apply biogas, we utilize crops which are discarded, lower energy consumption, and reduce environmental pollution. However, due to the low temperature in cold areas in winter, the gas production rate of biogas digester is too low, and the biogas digester cannot be even utilized normally because of frost crack. Through building the combined warming system with solar energy and biogas boiler, the temperature in the biogas digester is tested and analyzed, and the matching ways of combined operating with area of solar collector and biogas boiler are determined. The results indicate that combined warming system can keep the biogas digester in a better fermentation temperature, which will ensure a continuous and efficient gas production rate and resolve the bottleneck problem of being unable to use biogas normally in cold areas in winter.