Simulation And Analysis Of The Biomass And Trough Solar Co-Generation System

Solar thermal power generation as an integral part of the new energy power generation, which can ease the greenhouse effect and environmental pollution caused by the traditional coal-fired and gas power generation. Trough solar thermal power generation technology is the most mature technology in the solar thermal power generation. After several decades of development, the development of solar thermal power generation has entered the stage of commercialization. However, due to the intermittent and instability of solar energy resources, the efficiency of the solar thermal power generation system is low. Through solar energy and other power generation technology combined power generation, can effectively solve the instability caused by solar energy resources diurnal fluctuation of solar power generation, with combined cycle of solar energy to improve the net power generation efficiency. This paper presents a new type of solar energy and biomass energy combined power generation system as the main research object, to carry out the following aspects of the theoretical analysis and exploration:(1) Based on the steady state heat transfer theory of tube, establish the steady-state heat transfer model of trough type solar high-temperature vacuum heat collecting pipe, thermal performance of vacuum tube collector. Analysis effects of fluid inlet temperature, direct solar radiation intensity and flow velocity on the thermal performance.(2) Establish parabolic trough solar concentrator model based on the optical correlation theory, analyze and simulate LS-3 type condenser set heat exchanger condenser performance with the help of the software SolTrace. The simulation results of tube surface heat flux density distribution is uniform. With the sunlight cosine efficiency as characteristic parameters, Urumqi and Nanjing area concentrating collector tracking mode is analyzed. When the collector with North and South (axial) tracking mode, the day sunlight cosine efficiency changes larger, annual incidence coefficient differs is little, so North and South (axial) tracking mode is suitable for winter; and north-south axis tracking mode is more suitable for summer.(3) 50MW Trough solar energy and biomass co-generation power system model is set up based on the simulation and analysis of vacuum heat collecting pipe and a parabolic trough concentrator. Using SAM software to simulate the trough solar energy and biomass energy combined power generation system, solar collector selected LS-3 concentrating collector, mock location selection in Nanjing, solar mutiple SM=1, biomass fuel fraction BFF=0.3; analysis of DNI, biomass boiler operation mode and other factors on the performance of combined power generation system. Simulation results are obtained for the combined power generation system in a typical day (day of the summer solstice, winter solstice, power generation, thermal efficiency, biomass boiler production of heat and under different cooling system power capacity.(4) Using SAM software to analyzing the ecnomic performence of the co-generation power system, mainly analyze the influence of different solar mutiple and biomass fuel fraction combinations of combined power system generation costs; at the same time the system of various taxes, costs and other factors, as well as the cooling methods is also analyzed. Results show that in Nanjing the co-generation power system with biomass boiler with constant recruitment patterns, multiple sun for 4, biomass boilers share 0.25, is in optimum operation conditions. And the LCOE take minimum 1.23058 yuan/kWh; combined power generation system of biomass boiler with minimum security mode, multiple sun for 4, biomass boilers share of 0.3, the combined power generation system in optimum operation conditions, and the LCOE is minimum 1.14892 yuan/kWh.