| China's energy strategy in rural areas is mainly the development of the use of renewable energy. Currently, the burning of straw and other biomass and Centralized power supply by the fossil fuel is being used to be the traditional way of energy consumption in most rural areas when it is not only a pollution of the atmosphere, but also a waste of energy resources. There are some remote mountainous areas, where the power grid can not get and energy used in life become a major problem. Therefore, the study of new ways of energy use and the development and utilization of renewable energy according to local conditions has very important significance.The characteristics of biogas and solar in rural areas were described with comparative analysis of ways of various combinations used in CCHP in this paper. From the perspective of cascade of energy use, the CCHP was established, in which the methane as the fuel gas of steam turbine power system, ammonia absorption chiller to cooling, and solar combined with flue gas heat to heating. It classified the process equipments, established a mathematical model to their respective uniforms and also thermodynamic evaluation, and did the simulation and calculation of thermodynamic indicators with HYSYS.Three typical conditions were established according to the characteristics of cooling, heating and power load in rural areas. It developed a system of variable parameter operation strategy, and did related research and analysis of variable operating conditions. Results indicated: Energy supply from the system could basically match the hot, cold and electrical demand in rural areas, which reflected its good variable conditions.The new way of energy use combining biogas and solar energy with distributed energy system not only widened the application field of renewable energy, reduced pollution emissions, achieved cascade of energy use, but also provided a new approach and theoretical basis in order to solve energy problems in rural areas. |
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