The Empirical Analysis On Benefits Of Biogas Engineering On Large-scale Farm In Jiangsu Province

China’s economy is in a rapid development period,The rapid growth of energy consumption so that our country is facing energy supply constraints, caused by the use of coal a large number of very serious environmental problems.In our rural areas, farmers use straw, firewood instead of fossil fuel combustion, which is not only inefficient, but also produces a series of issues, like a waste of resources, environmental pollution, ecological destruction and so on. What is more, biogas as a green, clean renewable energy is more and more popular in the rural areas,and as one of the four priority energy projects, with the promotion and application.The biogas project especially the large and medium scale biogas projects, to a large extent, solved energy shortages. So that the farmers’living environment has been greatly improved.Also the resource utilization of the residue slurry has many benefits, one of which is to improve the farmers’ income. Large and medium scale biogas projects match with the development trend of large-scale farms, which is compatible with a broader space for development. And with the promotion of the biogas, there is growing concern about the implementation effect of such projects. However, the study of biogas-benefit analysis are mostly for household biogas, seldom for biogas projects of large-scale farms. Basically, the research stays on the stage of a single economic evaluation or qualitative analysis, lack of a comprehensive analysis of the overall project. Taking large-scale farms in Jiangsu Province as example, this paper gives a comprehensive analysis of its energy environmental and economic benefits.The results showed that large-scale farm biogas projects has great energy, environmental and economic benefits. As is known that biogas has enormous advantages in alternative power, and the following is wood and straw. Therefore by generating electricity, large-scale farm biogas projects get maximum energy efficiency. In addition, the implementation of biogas projects can greatly reduce greenhouse gas of the livestock and poultry farms, especially in the methane gas emission reduction. The emission reduction is up to91.63%, which brings significant environmental benefits. From the financial analysis and economic analysis, it is showed that from the views of both the farmers and society, large-scale farm biogas benefits are greater than the costs. By the government’s support, the financial benefits are far greater than the national economy efficiency, so that enterprises and individuals obtain a substantial income, greatly improving the construction of biogas in rural areas.According to deficiencies in the construction, operation, management, lots of measures and recommendations are promoted for the development biogas projects in Jiangsu rural areas.