The Research Of Combined Cooling Heating And Power System Based On Solar Energy And Biomass Energy

looking for renewable energy to replace fossil fuels become an effective way to relieve the dependence on fossil fuels, the solar energy and biomass energy is conform to the ideal energy of sustainable development strategy. This paper developed a set of combined cooling heating and power system based on solar energy and biomass energy.By solar heating circulating water drive gas output, after purification purified biogas into the micro gas turbine is mixed with air power generate electricity,, the high temperature flue gas discharge drive the libr absorption chiller generate cooling, due to flue gas still have higher temperature, so will the rest of the flue gas waste heat recycling device to a life of hot water, In line with the" temperature counterpart, energy cascade utilization"Research of combined cooling heating and power system based on solar energy and biomass energy, The research methods are combining the theoretical calculation and numerical simulation, for a comprehensive evaluation system, This research content and the results are as follows:(1) In this paper, Combined cooling heating and power system based on solar energy and biomass energy was built, results are as follows:in solar energy produced efficient biogas subsystem, calculate the daily heat storage4320.1MJ; actual heat collection area of470m2; need30tube solar collector125sets; the volume of a gas tank need at least210m3; to ensure the normal operation of constant temperature anaerobic digester, every day need to provide to the pool of total quantity of heat of hot water is4286.7MJ.In biogas purification purification, the main products after purification purification link:0.5MPa,25℃,99%volume fraction of methane249.49m3, secondary product produced at the same time:25℃,100%volume fraction of the carbon dioxide166.32m3, and desulfurization link elemental sulfur produced1800g.In this paper, the energy flow of system is analyzed:it is concluded that the system total energy efficiency of59%, compared with points for system and combined system that combined system has the highest total energy efficiency, combined system relative to the points for system of an energy saving rate of35%..In this paper, the exergy flow of system is analyzed:In the process of the micro gas turbine cycle, combustion chamber exergy loss is the largest; In the process of lithium bromide absorption refrigeration, the largest is the generator exergy loss. The final combined exergy analysis of the whole system was42.3%(2) According to the law of conservation of energy, some parameters change in energy input to the system influence on the corresponding energy output is analyzed:∥①.As the temperature rise, solar collector collection efficiency increases, and the micro gas turbine power generation efficiency and use efficiency were decreased;②.when the methane content reduced, regenerator exhaust temperature decreases,the generating efficiency also decreases. exhaust temperature lead to refrigeration efficiency of system reduce change, the reduce of exhaust temperature, refrigeration efficiency first decreases and also flatten out gradually.waste heat recovery efficiency as the exhaust temperature lower and lower.③. Under the condition of the micro gas turbine other conditions are the same, with the increase of air-fuel ratio, system efficiency, power generation efficiency and refrigeration efficiency first increases then the tends to be smooth, air flow between0.60-0.65kg/s system efficiency and refrigeration efficiency, reach maximum efficiency of, the power generation efficiency and refrigeration efficiency. achieves maximum, waste heat recovery efficiency because of the exhaust temperature with the increase of air-fuel ratio increased gradually increase,.Thus, air-fuel ratio is too big or too small are not conducive to output electricity, cold and heat, With the increase of temperature ratio system efficiency, power generation efficiency and refrigeration efficiency under the with air fuel ratio has increased, waste heat recovery efficiency increases with temperature than less(3) Technical economy analysis was carried out on the system, the results is that one micro gas turbine operation system under the static payback period is9.8years. When increased to two micro gas turbine, the electricity reaches60kW, the static payback period of investment dropped to6.24years, a33.26%drop in, and then continue to increase the number of micro gas turbine, but the static investment payback period to reduce is not obvious.The innovation point of this subject is:Build and evaluate combined cooling heating and power system based on solar energy and biomass energy and reveals the system performance.The National High Technology Reasearch and Development Program ("863" Program) of China(2014AA052801), Gansu province outstanding youth science fund project (1210RJDA016), Gansu province construction science and technology research projects (JK2010-29), Project in gansu province department of education (0803-06), Hong Liu outstanding talents of Lan Zhou university of technology (Q201101) funded j ointly.