Research And Design Of Combined Cooling,Heating And Power Supply System In Northeast Rural Area

The main development trend of the current clean production capacity and distributed energy supply system is the Combined cooling,heating and power supply system,which has the characteristics of diverse energy supply,flexible scheduling and high energy efficiency.Aiming at the problems in the process of energy utilization in rural areas of northeast China discovered in the field investigation and the characteristics of poor energy storage performance in local village houses,this paper designs a Combined cooling,heating and power supply system considering the energy storage of buildings with phase change energy storage materials.The system can make full use of local clean energy to provide electricity,heating and cooling energy for villagers,and effectively solve the problem of unreasonable local energy use.Meanwhile,it can enhance the energy storage and temperature regulation capacity of buildings,reduce energy waste,and improve the living comfort of villagers.The main work of this paper is as follows:(1)This paper establishes the mathematical models of thermal dissipation of the building,each energy production equipment and energy storage equipment in the system.And this paper introduces the three operation modes of the system which are distinguished by their connection with large power grid and the energy storage principle of phase-change energy storage materials.It analyzes the energy consumption and its economic and environmental protection during the operation process of the system,and then obtains the various costs in the use process,and establishes the mathematical model of the use cost.According to the energy supply and demand balance and other requirements of actual example village to design constraints,with the objective of economic optimization,particle swarm optimization was used to establish the system operation mode and the capacity of the system equipment,and the impact of fuel price and power purchase cost on the system use cost was studied.(2)In order to change the characteristics of poor thermal storage capacity and low comfort degree of red brick in the construction of adobe beds and walls in northeast China,phase change energy storage materials mixed with paraffin and gypsum were used to replace red brick.Meanwhile,a real-time temperature monitoring device was installed in the room to monitor the indoor temperature and feed back to the output of the combined supply system regulating equipment.Taking the wind and solar power generation curves of the three typical seasons obtained from the survey as parameters,in combination with the energy demand curve of the three seasons,taking the balance of energy demand as the limiting condition and considering the electricity sales revenue,the optimal scheduling objectives of economy,environmental protection and energy conservation were taken as the system optimization objectives.The weighted linear sum method was used to assign different weight ratios to the three objectives,with the maximum economic weight coefficient and the minimum environmental weight coefficient.The multi-objectives were changed into a single objective function.The genetic algorithm was used to optimize the solution,and the operation scheduling curve of the system equipment output and work in three typical seasons most consistent with the target was obtained,and the equipment work curve was interpreted and analyzed.(3)The transformer station area with the longest connection in the village is selected for the actual calculation example,and its tower routing diagram is changed into a circuit diagram to calculate the line voltage drop and line loss in the village before and after the addition of the system.Combined with the survey data,the economic investment of villagers in winter heating and summer heat escape before and after the system was put into operation was analyzed,and the improvement of renewable energy utilization rate and resource waste in the village was comprehensively considered.By comparing the environmental friendliness,the benefits of the system in terms of economy,energy conservation and environmental protection were summarized.The results show that the combined cooling,heating and power system with phase change energy storage materials can make more flexible use of clean energy,use less primary energy,improve power quality of the grid,and improve power supply reliability and power stability.