Biogas power plants waste heat utilization researches

This paper discussed the significance of developing biogas power plants in large breeding farms firstly. Then the system energy balance and the produced process of waste heat were studied respectively. The status of making use of waste heat in biogas power plants were also discussed in China. Through studies, two main schemes of making use of waste heat in biogas power plants of large breeding farms was proposed, which were providing residents with heating or cooling load for the requirements of indoor environment according to seasons and constructing cold storages for poultry product processing and storage. In this paper, the methods of making use of waste heat in a biogas power plant of an agricultural demonstration zone in a coastal city were discussed from both sides of economic and environmental benefits and we adopted the second method at last. The results showed that the comprehensive utilization rate of biogas energy was nearly 80% after making full use of waste heat. The project had good economic and environmental benefits. The schemes can give some references in the utilization of waste heat in biogas power plants of large breeding farms and other similar projects.