Research On Integration And Operation Optimization Of Biomass-Based Polygeneration System For Cooling,Heating,Electricity And Hydrogen

Diversified energy demand from building and transportation fields is booming growing increase has drawn more and more attention,especially the increase of building load fluctuation caused by the access of large-scale hydrogen vehicles,the integration method of traditional building energy supply system cannot adapt to diversified energy consumption.Meanwhile,the growth of energy demand has led to a substantial increase in energy consumption,and the resulting environmental pollution and energy shortage have forced the development of efficient renewable energy utilization technologies to be an important research field.Therefore,it is great significance to realize the efficient utilization of energy and improve the efficient of comprehensive energy system by exploring the correlation between energy supply characteristics of renewable energy system and energy demands of building and hydrogen vehicles,thereby promoting realization of carbon neutrality.This dissertation takes the biomass gasification-based energy system for cooling,heating,electricity,and hydrogen as the research objects,and chooses energy,environment and economic performance as the research goal to carry out system integration and operation optimization research.The main work is as follows:(1)Considering the diversified energy demand of building and hydrogen vehicles,a biomass gasification-based energy system for cooling,heating,electricity and hydrogen is proposed,and the mathematical models of integrated system and reference system are constructed.Based on the characteristics of diversified energy demand and the structure of integrated system,two novel operation strategies(following the electricity demand with hydrogen load,following the thermal demand with hydrogen load)are presented,and the multiobjective evaluation model is constructed based on primary energy consumption saving ratio,CO2 emission reduction ratio and annual total expenditure reduction ratio.(2)The hydrogen demand from hydrogen vehicles is introduced,and the seasonal changes and the difference between weekday and weekend of hydrogen demand are considered.The hourly cooling,heating and electrical load of building are simulated by DeST.The key values,which consists of the rated electricity capacity of PGE,the proportion of cooling/heating generated by GSHP to cooling/heating load and the critical parameter to decide whether open the PGE,are calculated by multi-population genetic algorithm.The comprehensive performance of polygeneration system are evaluated form energy,economy and environmental aspects.The operation performance of integrated system under different operation strategies are compared and analyzed.Sensitivity analysis is carried out based on key influencing factors.