Solar-natural Gas Distributed Energy System Research In Severe Cold Regions

Today,when energy supply tends to be tight,how to save energy and use resources reasonably and efficiently has become a fundamental problem in China's energy development process.Unifying high-quality electric energy and low-quality cold and hot energy needs,and improving energy efficiency is the most important thing at the moment.The natural gas distributed system is constantly emerging in the energy structure adjustment.It is an optimal energy utilization method that integrates safety,economy,energy conservation and environmental protection to improve energy efficiency.Solar energy is inexhaustible and inexhaustible.It is a renewable and clean energy source.Aiming at the energy status and heating shortage in China's severe cold and cold regions,this paper proposes a coupled solar energy-coal energy supply system for severe cold regions.The coupled system gas internal combustion generator produces electricity at the same time,the generated high-temperature flue gas enters the waste heat boiler,and the waste heat boiler prepares steam,and in the summer working condition,the steam double-effect absorption type air conditioning unit supplies the system with chilled water,insufficient The cooling capacity is supplemented by the electric air conditioner,and the domestic hot water is supplied through the steam-water heat exchanger;in the winter working condition,the steam is prepared by the waste heat boiler,directly leads to the steam point,or the heating hot water is prepared through the heat exchanger.And domestic hot water,insufficient heat is supplemented by gas boilers,while the solar photovoltaic system is used to continuously supply power to the system.It realizes the cascade utilization of energy and saves the dual effect of primary energy.This paper introduces the composition,working principle and system characteristics of the solar-natural gas distributed system.It takes the public buildings in the cold and cold regions as the research object,and conducts on-the-spot actual investigation of the actual project,from theoretical analysis,numerical simulation and example measurement.The research was carried out to propose the operation strategy of the system under different water supply temperatures.Due to the cold and long winter in the cold and cold regions,the large amount of heat and electricity consumption and the great energy saving potential,detailed simulation calculation and comparative analysis of the energy supply operation mode of the solar-natural gas distributed system in winter are carried out,thereby determining the energy saving of the system.Potential and feasibility.This paper establishes the mathematical model of each main component through theoretical calculation,and uses DeST as the pre-processing software to build the public building model and simulate the annual energy use,and simulate the load of the building with the energy supply area of 75,000 square meters.Analyze the current status of distributed energy system load and annual energy consumption in severe cold regions.Then,through on-site investigation of specific projects,a more detailed understanding of the environment in which the system is located,determine the system process,and make the theoretical concept feasible.Then,the simulation model of the solar-natural gas distributed system was established by TRNSYS,and the operation status of the system was simulated and analyzed.The system operation effect under different water supply temperatures was analyzed,and the optimal operation strategy of the system was explored.Through simulation,it is determined that the optimal water supply temperature of the system is 70?,and through the actual project research and system ecology and economic analysis,the distributed system has reduced the annual purchase of electricity by 2.027 million KWh,and the annual electricity purchase cost is 2.393 million yuan.The annual operating cost is 1.424 million yuan,the comprehensive utilization rate of triple-year energy supply can reach 81.6%,the number of generators full-time hours is 4137.3h,compared with the traditional energy-saving rate of 39%,and the contrast advantage with traditional energy supply mode is very impressive.