Research On Environmental Temperature And Humidity Control Of Intelligent Granary For High,large And Low Temperature Finished Grains

In this paper,the method of numerical simulation combined with experimental verification is used to study the anti-condensation problem of finished grain(rice)in the process of entering,leaving and storing finished grain(rice)in a high-low-temperature finished grain intelligent granary to be built in Shenzhen.Design,and use the simulation software Fluent to carry out numerical simulation to obtain the best design scheme,aiming to achieve low energy consumption and safe storage of finished grains.The main research contents and results are as follows:(1)Measure and calculate the physical parameters of different outer packaged finished grains,and analyze the causes of condensation.Use Fluent software to simulate the process of entering and leaving the warehouse,and obtain the environmental temperature and humidity parameters for safe entry and exit,according to the simulation results,a plan for slowing down the entry and exit of the warehouse is formulated,and the simulation results have been effectively verified through experiments.(2)Taking a tall and low-temperature intelligent granary of Finished grain in Shenzhen as an example,the air flow organization of the air conditioning system of the granary was designed: the air flow organization form of side supply and side return was selected,and the regional control theory was proposed;Calculation of air-conditioning cooling load and air supply in summer;The rectangular nozzle was selected as the air supply nozzle and the initial design parameters were obtained as the initial scheme of subsequent simulation based on the jet jet empirical formula.Evaluation index of air distribution is put forward.(3)Based on the initial design scheme,carry out numerical simulation on the air distribution in the stored area,and study the influence of different clearance ratios on the air distribution.The clearance ratio = 0.789 is the best shelf clearance ratio;the air distribution is optimized according to the simulation results.: Taking the number of air supply ports,air supply temperature difference and air supply speed as the influencing factors,9 groups of working conditions are designed through the orthogonal test method,and the optimal air supply conditions are obtained by comprehensively comparing the air distribution evaluation indicators and simulation results;Under the optimal air supply conditions,the relative humidity of the air supply is 60%-65%,and the optimal air distribution scheme is obtained.(4)The influence of the stacking method of finished grains and the air supply speed on the cooling rate of high-temperature grains was studied.The results showed that: by improving the stacking method of high-temperature grains,the large grain piles were changed to small grain piles of the same volume,and the distance between the above grain piles was increased.When it is 100 mm,it can effectively improve the cooling rate of the grain pile and weaken the thermal insulation of the original large grain pile;and changing the air supply speed has little effect on the cooling rate of the grain pile,so on the premise of meeting the design requirements,choose a lower air supply The speed is the optimal air supply speed of 7.7m/s.