Design And Simulation Research Of Solar-Boiler Combined Medium Temperature Steam System

With the rapid development of economy and society,the total energy consumption of our country is also growing rapidly.Fossil fuels such as coal and oil meet the huge energy demand of our country,but also brings a series of serious environmental pollution problems.As an inexhaustible clean and renewable energy,solar energy has the important quality of being clean and non-polluting.It is an important energy situation that effectively replaces traditional fossil energy for production and life,and has attracted worldwide attention.The introduction of solar energy into process heat in the industrial field through solar medium temperature heat utilization technology has a very important role in reducing the cost of energy consumption of enterprises,reducing environmental pollution and promoting the construction and development of China’s low-carbon economy.In this paper,a new type of solar-boiler combined medium-temperature steam system is proposed,which overcomes the disadvantage of unstable energy input in solar energy utilization system caused by the instability and randomness of solar radiation,on the other hand,takes advantages of environmentally friendly and pollution-free of solar energy and natural gas.This article takes the steam heat demand of a textile factory in Guangzhou as an example to conduct a detailed simulation study on the operating characteristics of the system,and achieves the maximum energy saving and economic benefits of the system through the optimization of heat storage components and related parameters.Firstly,the principle of the solar-boiler combined medium-temperature steam system is elaborated in detail.Based on the heat demand of a textile factory in Guangzhou,selection calculation has been taken for the various components of the steam system,including detailed design and installation analysis of the solar collector systems,the heat storage subsystem,the auxiliary boiler and the heat transfer equipment.At the same time,the corresponding control strategy of the system operation is proposed to make the system operation more reasonable.Secondly,based on the energy conservation law and corresponding mathematical knowledge,accurate mathematical models have been established for each component of the system,and the operation characteristics of the system throughout the year have been simulated using TRNSYS and MATLAB software.The system’s collecting efficiency,system’s solar energy guarantee rate,heat storage system cost,system heat supply and its environmental protection and economy have been deeply studied,and the overall running performance of the system has been comprehensively assessed.Finally,the simulation results of the thermal oil storage system and the steam accumulator system are compared for the critical part of subsystem of the new solar-boiler combined medium-temperature steam system,the influence of various factors on the system performance was analyzed.The system was optimized from the aspects of collector operating parameters and storage capacity to further improve the system performance.After overall optimization of the system,the system’s energy saving and economic benefits are more significant.