Integration Of Middle-and-Low Temperature Solar Energy And Methanol Thermochemical Hybrid Distributed Energy System

Energy is one of the material basis for the existence and development of human society.Excessive consumption of traditional non-renewable fossil fuel has caused a series of problems including unsustainable energy supply,environmental pollution and greenhouse gas emission,which threaten the survival and development of human beings.To develop renewable energy utilization technology,including solar energy,is the only way to achieve the harmony of human development with environment.Based on the National Natural Science Foundation and other important national scientific research projects,this thesis has carried on a thorough research on the integration of the middle-and-low temperature solar energy thermochemical hybrid with methanol power generation system.Aiming at the key issues of "multi-energy hybrid and energy grade coupling",research on energy conversion mechanism,system integration method and experimental study of multi-energy hybrid is carried out in this thesis.Based on basic laws and basic relations of thermodynamics,derives energy grade correlation formulas of solar thermal energy thermochemical hybrid with fossil fuels.Based on middle-and-low temperature solar thermal energy driven methanol reforming process,carried out research on coupling of energy coversion and chemical reaction in parabolic trough concentrator solar energy collecting middle-and-low temperature solar chemical absorber-reactor.Established a reforming dynamic coupling model based on parabolic trough collector heat transfer and Cu/ZnO/Al2O3 catalyst.A non isothermal solar thermochemical absorber/reactor model of methanol reforming was established.The influence of the key parameters including solar radiation intensity,material flow rate and temperature,water/carbon ratio on solar fuel conversion was revealed.Integrated a middle-and-low temperature solar thermal energy thermochemical hybrid with methanol distributed energy system with chemical heat recovery and chemical energy storage function based on chemical energy and physical energy comprehensive cascade utilization principle.The thermal performance of the design and off-design working conditions of the system is studied.A system control method under the condition of variable solar irradiation is proposed,by which the system has a stable electricity cold and heat output under wide solar irradiation intensity range.Developed a low concentration ratio parabolic trough solar tracking simulation program,the characteristics of partial rotation tracking mode was studied.By simulating partial rotation tracking mode in typical weather of the four seasons on variable latitudes under variable limit rotation angles,characteristics of the partial rotation tracking mode are abtained,which can provide reference for the arrangement of solar field.Designed and built a 100 kW middle-and-low temperature solar chermaochemical hybrid power generation experimental platform.The experimental platform consists of methanol storage and feeding system,internal combustion engine flue gas heat recovery and methanol evaporation system,methanol pipeline heating,middle-and-low temperature solar thermochemical fuel conversion system,synthesis gas condensation and methanol separation and recovery system,chemical energy storage system,syngas pressurization system,hydrogen-rich fuel internal combustion engine power generation system,meteorological data acquisition platform,data acquisition and control system.A preliminary experimental experiment was carried out.