Application Research On Energy Storage Technology In Natural Gas Distributed Energy-supplying System

Compared with the largest consumer energy—coal,one ton oil equivalent natural gas burning can reduce 52.1%carbon dioxide emission.Natural gas,a kind of clean energy,can make a great contribution to reaching carbon emission peak.In this dissertation,a planned distributed energy station of natural gas is taken as the research object,and the research of load characteristics,load influencing factors and water energy storage is done.First of all,this dissertation introduces typical CCHP project at home and abroad.After reading,reviewing literature and understanding natural gas’s contribution to carbon emission reduction,a natural gas driven CCHP,combined with ground source heat pump system and water energy storage technology is determined.Residential building models with the same size of actual building are built in De ST software and 8760 hours’air-conditioning loads are forecasted.Due to the huge difference of load demand in different periods of time,it is necessary to set up energy storage devices in distributed energy station to make up for the time mismatch between the supply side and the demand side.The results of load simulation confirm the necessity of energy storage system in this energy station and the hourly power consumption of energy station is calculated on the basis of simulation results.Four influence factors on the cooling and heating load of building are analyzed by using local sensitivity method to estimate the load of energy supply area more accurately and reduce the error.Existing energy supply system design is introduced.Finally,thickness change of thermocline and temperature distribution in static state is studied via simulation together with experiments.The results of simulation and experiment provide theoretical support for the size optimization of the storage vessel in the energy station,so that the stored energy can be used efficiently.To meet carbon reduction needs in my motherland and resolve structural contradiction between supply output structure and demand side load characteristics,the load characteristics of hourly air conditioning in the energy supply area are simulated,and the sensitivity of four factors affecting the buildings in the energy supply area is analyzed on the basis of existing energy supply system design.In order to make efficiently utilization of the stored energy and provide theoretical reference for optimization of reservoir,analysis of thermocline’s thickness variation is carried out.This dissertation has done some work for the planning energy station to make efficient use of clean energy,reduce CO₂ emissions on the basis of meeting the energy demand side,solve the time mismatch between load supply and demand side,and make efficient use of stored energy.