Optimization Analysis On Operation Strategy Of Dynamic Ice Storage System In Energy Station

With the rapid economic development,the current shortage of energy in our country is increasingly serious.The lack of electricity in our country at this stage does not refer to the lack of electricity,but the lack of electricity.The gap between the peak and the trough of the daily power grid is gradually increasing,and the peak shaving problem is becoming more and more serious.As a large power consumer,the air conditioning system becomes particularly important for its design and optimization.Taking the dynamic ice storage air conditioning system of Hainan cold chain logistics park and Chongqing No.1 energy station as the research object,this paper studies the economic,power consumption and environmental protection benefits of the system under different operation strategies in the cooling season and heating season through actual measurement and software simulation,so as to provide guidance for the application and optimization of the dynamic ice storage system in the future.First of all,the indoor and outdoor temperature and humidity during the cooling and heating season,unit performance,ice storage equipment performance and plate heat exchange performance of the two projects were tested on site,and the mathematical model was established with the test data.The energy plus software was used to complete the simulation of the cooling and heating load,and the feasibility of the monitoring data and the data imported into the MATLAB model was verified.Secondly,the dynamic ice storage system was analyzed,the operation modes of ice storage priority and unit priority(non ice storage)under four different typical load rates are determined.Combined with the load days and other investment costs of the system,the results show that compared with the unit priority operation mode,the annual power consumption is increased by 11.75%,the operating power cost is saved by 16%,and the static investment recovery period is 1.49 years.Therefore,the dynamic ice storage system has no energy saving benefit,;at the same time,under this mode,the annual average peak load shifting rate is 50.31%,the valley power utilization rate is 49.52%,and the peak cooling release rate is about 85%.So most of the cooling capacity can be applied during peak hours,effectively relieving the pressure of power supply and distribution.Thirdly,in order to further realize peak shifting and valley filling and make full use of cold storage tank,in summer,the external melting ice storage system is changed to the ice slurry dynamic ice storage system,and in winter,the original heat pump heating form is changed to the combined form of water tank heat storage and heat pump heating.In summer,the different operation modes of traditional non ice storage,ice storage tank priority and unit priority are studied.Combined with the load days,the non ice storage operation strategy is taken as the benchmark.Under the ice storage priority operation strategy,the power consumption of the whole cooling season increases by13.34%,the operating cost is saved by 14.57%,the average peak shift power rate is56%,the utilization rate of valley power is 41%;At the same time,compared with the original static ice storage system(the average peak shift power rate is 49%,and the valley power utilization rate is 43%),the ice tank cooling capacity utilization rate during the peak electricity price period has been significantly improved.Finally,the optimal operation strategy of water storage + water source heat pump composite system in winter is analyzed.The results show that the optimized composite system can increase the power consumption by 4.34% in heating season,save the operating electricity by 27.11%,shift the peak electricity rate to 73% in heating season,and achieve the valley electricity utilization rate of 50%.In order to explore the influence of temperature difference of heat storage,the temperature difference of 20 ℃heat storage is changed to 15 ℃ under 100% load,and it is found that the original20 ℃ heat storage scheme is more economical;in order to avoid water mixing at different temperatures,the water distributor of heat storage tank is selected.Through the simulation of the running state of the tank,it is concluded that the selected water distributor meets the requirements.In summary,the reasonable operation of the regional dynamic ice storage air-conditioning system can bring significant economic and environmental benefits to users,and can effectively alleviate the problem of grid pressure.