Research On Heat Source Configuration Of Combined Heating System Of Electric Boiler And Gas-fired Boiler

With the rapid development of the social economy,China faces the serious energy and environment problem,which put forward higher requirements for the energy-intensive heating industry.The Chinese government has also made a lot of efforts to solve these problems.Coal-to-electricity and coal-to-gas are being implemented in various heating areas in China.The contradiction between using coal-fired boilers for heating and environmental pollution can be effectively solved by using electric boilers to heat with wind power and using natural gas as fuel for small heating boilers.This paper comprehensively considers the three aspects of environmental impact,energy consumption and economy,and optimizes the heat source configuration of the combined heating system of electric boiler and gas boiler.In order to obtain a heat source allocation scheme for a combined heating system with little impact on the environment,low energy consumption and economy.Firstly,this paper uses the method of dimensionless comprehensive formula to determine the heating load continuation time curve,and according to the meteorological parameters of the heating building location and the function of the heating building to confirm the value range of the ratio of the electric boiler bearing the design heat load.At the same time,Identify the different ratios as configuration scheme of the combined heating system.In this paper,a mathematical model for optimization of heat source allocation in the combined heating system of electric boiler and gas-fired boiler is established by taking the load ratio of electric boiler to design as a variable.Secondly,in this paper,the fuzzy optimization principle of the multi-objective unit system fuzzy optimization model is used to establish the achievement function of the mathematical model of optimization of heat source allocation and to solve it by using MATLAB programming.Then got the optimal heat source configuration scheme of the combined heating system of electric boiler and gas boiler.A calculation method is provided for the optimization of heat source allocation scheme for the combined heating system of electric boiler and gas boiler in different regions and different heating buildings.In the process of solving the achievement function,the weight of each goal is determined by the analytic hierarchy process(AHP),and the relative membership degree of each goal is calculated by using the cost-basedmembership function because all the objectives studied in this paper are cost-oriented.Finally,this article takes a residential district with a heating building area of227000 square meters in Zhangjiakou City,Hebei Province as an example,To research and analysis on the combined heating system of Electric Boiler and Gas-fired Boiler.In this paper,the optimal heat source allocation schemes aiming at environment,energy consumption or economy are obtained by calculation and analysis.Then these schemes are compared with the optimal heat source allocation scheme obtained by solving the mathematical model of heat source allocation optimization(the designed heat load ratio of the electric boiler is 0.9225).Finally,the optimal heat source allocation scheme with comprehensive consideration of three factors is better than the optimal heat source allocation scheme with only one factor taken into account.The paper also analyzes the sensitivity of energy price to the annual cost and the optimization scheme of heat source configuration of electric boiler and gas-fired boiler combined heating system,got the optimal heat source allocation scheme which corresponding to the different energy price ranges.It provides a reference for the heat source configuration of the combined heating system of electric boiler and gas boiler under different energy prices.At the same time,through the analysis,In a certain range of energy price fluctuations,the heat source allocation scheme(the electric boiler undertakes the design heat load ratio)is stability.