Experiment And Numerical Analysis On Temperature Field Of Underground Ecological Storage

The exploitation and utilization of underground space is an important measure to implement the "Thirteen-Five-year Plan" of the Ministry of Housing and Construction and An important measure to implement the development goal of "three deep and one soil" in the Ministry of Land and Resources.It is also an important part of national innovation-driven development strategies.Underground storage granary has the advantages of energy saving,land,erosion,environmental protection,at the same time can ensure the quality of food,but the temperature in the silo will be affected by geological conditions,depth and external temperature and other factors,grain temperature as an important factor in the storage of grain,high temperature will lead to the growth and reproduction of pests,The study of the temperature field of the underground reservoir will be beneficial to the law of temperature change in the grain heap,and it is of practical significance to realize the development strategy of the grain in the land and grain in the shallow land.Combining with the special technology of national Grain Public Welfare Industry(No.201413007-01),this paper makes a systematic study and analysis on the change of temperature field before and after the storage of 83 tons of underground simulated test silo by means of experimental research and numerical analysis,and obtains the law of temperature change in the silo.Comparing with the numerical analysis and test verification of 3500 tons of production test warehouse,the similarity relationship between the two temperature changes is obtained,and the warehousing and height of the high temperature season of the production test warehouse are simulated and predicted.The main research results are as follows:1.Through the test and monitoring,the temperature,geothermal,moderate and different height of the grain temperature,different positions of the ground before and after the storage of grain temperature changes map,and it is concluded that the temperature in the silo has low temperature stability.2.Taking the ambient temperature of the underground simulated test silo as the boundary condition,the finite element simulation of the established physical model iscarried out,the sectional view of the temperature in the silo before and after the grain is obtained,the internal heat transfer process is found,and the mathematical model established by the numerical simulation is verified by the test results,and the consistency of the two changes is obtained.3.On the basis of the numerical simulation and test verification correctness of the production test warehouse before the grain is installed,the simulation analysis of the temperature after the grain is obtained,and it is concluded that the temperature of the production test warehouse after the grain is lower than that of the simulated test compartment,which indicates that with the increase of warehouse depth,the more favorable the safe grain storage.4.By adopting the two States of quasi-static and mechanical ventilation to simulate the feasibility of high temperature season warehousing in the new underground production test warehouse,it is concluded that mechanical ventilation can effectively cool the the high temperature after warehousing,realize the temperature in the low temperature or quasi-low temperature state,ensure the safety of grain storage,and analyze the high numerical simulation of different grain contents It is concluded that the suitable height of the grain is 18 meters.