Optimization Of Solar-assisted Combined Cooling,heating And Power System Driven By Biomass In Xinjiang

In recent years,more and more attention has been paid to issues such as energy conservation and emission reduction,environmental protection,clean energy and renewable energy utilization.Based on the abundant solar energy and biomass energy in Xinjiang,the optimization of the solar-assisted combined cooling,heating and power system driven by biomass,and aims to provide a reference for the practical application of distributed multi-generation systems in Xinjiang.Firstly,the design scheme of the solar-assisted combined cooling,heating and power system driven by biomass is proposed,the working principle and operation characteristics of the main equipment are analyzed,a suitable solar collector was selected,and the efficiency equation of the internal combustion engine during partial load was fitted.The energy flow model of the traditional separation production was established to provide a reference object for evaluating the solar-assisted combined cooling,heating and power system driven by biomass.Secondly,based on the energy flow of system,a mathematical model of the system is established,and a set of comprehensive evaluation functions are set up using the primary energy efficiency,annual total cost savings,and carbon dioxide emission reductions as evaluation criteria.The difference of the energy flow priority and the mathematical model of the system under the two modes of electric heating.Next,a Corps building in Xinjiang is seleted as the target building and the cooling,heating and electricity load is calculated by De ST.Further,the equipment capacity under the two operation modes is optimized by genetic algorithm.The results show that the primary energy savings,annual total cost savings and carbon dioxide emission reduction of hybrid system increased by 18.81%,8.72% and 62.15% respectively compared with the traditional power supply system.The integrated performance increased by 29.48% and5.31% compared with the traditional energy supply system and the operation strategy of follow power demand.The typical days of cooling season and heating season is seleted as examples,the paper analyzes the output of the equipment,and proves that the optimized system realizes the coordinated operation among the equipment,makes the system output more reasonable to match the load demand.Finally,the sensitivity analysis of electricity price and biomass fuel price is carried out.The the cooling provided by the electric chiller to the cooling load and integrated performance under different prices are obtained.The cooling provided by the electric chiller to the cooling load obtained is fitted and the trend of the cooling provided by the electric chiller to the cooling load is given.In addition,the influence of different prices on the annual total cost of system and integrated performance is studied.The influence of building load distribution characteristics on combined heating and cooling and power systems was studied.The results show that the comprehensive evaluation function of buildings with obvious work and rest loads is 9% lower than that of load-steady buildings.The function has increased by 2.1% and 11.1% respectively compared to a single-load stationary building and a single-obvious work and rest load building.Taking the buildings with stable load and buildings with obvious work and rest load as examples,the optimal equipment capacity of two separate buildings and a combined park composed of two buildings were optimized respectively.And the change trend of the system evaluation function and performance parameters under the ratio of stationary load to the total building area under different load was obtained.