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With the social and economic development, the application of traditional fossil energy gradually led to the global energy crisis and environmental crisis. Growing car ownership, not only makes the car exhaust to become a major source of pollution in urban air, but also led to the accelerated consumption of the already increasing depletion of oil resources. Therefore, the use of biomass to replace the fuel can not only solve the energy problem, and to improve the environment of automobile exhaust emissions, at the same time, can also provide employment opportunities and improve farmers' income, to contribute to the rural economy, social issues. Large-scale implementation of the production and use of biomass fuels, will inevitably impact on the socio-economic, energy, environmental and ecological balance. China is a vast, over the natural environment and the socio-economic conditions are very different. The comprehensive benefits of the project will be caused by differences in socio-economic and technical factors, such as labor costs, policies and regulations, raw material processing and the production process. The implementation of the production and use of biomass fuels necessary to carry out in-depth feasibility analysis. In this paper, the life cycle of biomass fuels in China's Yunnan province dimethyl ether comprehensive economic, energy and environmental impact assessment, the feasibility of large-scale development of biomass fuel dimethyl ether in Yunnan Province, the ultimate goal for policymakers The high-quality decision-making basis. Preliminary definition of a specific type of environmental impact of the life cycle of the fuel dimethyl ether, and use AHP to determine the weight coefficients of the different types of impact, to build China fuel dimethyl ether of life cycle assessment model for the first time, and inventory data are classified, characterized and The quantization method are discussed in detail. Fuel dimethyl ether social life-cycle costs, life cycle external costs and net energy evaluation model. Indicators and their evaluation of the above cost calculation method; using life cycle optimization theory, of dimethyl ether lifecycle objective function, design variables and constraints and the calculation method discussed. Yunnan Province, the actual situation on the basis of theoretical studies, based on life cycle assessment in Yunnan Province straw - Forest (firewood forest) biomass fuel dimethyl ether, specific analysis include: (1) three kinds of biomass feedstock the life cycle of different straw lowest cost, followed by forest products residues, and forest biomass raw materials (firewood forest). 2 compared with conventional fuels (gasoline, diesel and fuel ethanol), the overall energy consumption of the fuel dimethyl ether is 59.16% higher, respectively, 67.91% and 51.54%, respectively, at the same time, reduce the consumption of fossil energy 72.13%, 68.87% and 75% and petroleum energy consumption of 56.57%, 52.22% and 56.02%, and a significant reduction in atmospheric pollution due to automobile exhaust emissions. The dimethyl ether lifecycle affect the results of the comprehensive evaluation of 3.03 × 10-5 / km. Dimethyl ether lifecycle process, burning / vehicle use \Dimethyl ether net social cost of energy 5.81 × 10-3 yuan / km, and its social net energy costs higher than gasoline, 89.91%, 88.81% higher than the fuel ethanol. Fuel dimethyl ether the social net energy cost reduction, the developed conversion rate than high-tech, and at the same time reduce the cost of production of dimethyl ether is the main way to reduce the dimethyl ether net social cost of energy. With the increase in consumption of gasoline, diesel, oil reserves reduced, gasoline, diesel fuel, the net social cost of energy will become increasingly high, taking into account the progress of dimethyl ether production technology and its own renewable, dimethyl ether can of petrol and diesel as a potential alternative fuel. 3 according to the Solver to use EXCEL in raw material and raw material costs, energy consumption and gas emissions as limitations unit, a variety of biomass feedstock ratio as a unit of the variable conditions for solving the optimal proportion x24 = 0.963 637 x25 = 0.036 363, X26 = 0. Thus the ratio to determine the optimal value of cost, energy consumption and pollutant emissions. The life cycle cost biomass feedstock made according to the proportion with dimethyl ether consumption, energy consumption and gas emissions graphs prove the correctness of this proportion. \Life cycle assessment model and the social net energy cost evaluation methods that can be applied to dimethyl ether can also be used for other products. Study on dimethyl ether life cycle inventory analysis, impact assessment, social net energy cost data information, dimethyl ether lifecycle sensitivity analysis of the objective function, these can not only provide a theoretical dimethyl ether scientific decision-making in Yunnan Province and data based on the development of relevant policies and tax policy for the state to provide important reference value.
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