沼气工程是指以粪便、秸秆等废弃物为原料,以能源生产为目标的系统工程。养殖场大型沼气工程的建设能够实现畜禽粪便的无害化、减量化和资源化,对实现环境、能源和经济的可持续发展具有重要意义。但大型沼气工程具有资金投入大、技术复杂、经济效益不明显 Biogas project refers to the waste, stool and other waste as raw materials, energy production as the goal of the system engineering. The construction of large-scale biogas projects in livestock farms can realize the decontamination, reduction and resource utilization of livestock and poultry excrement, which is of great significance for the sustainable development of environment, energy and economy. However, large-scale biogas projects with large capital investment, technical complexity, economic benefits are not obvious