Research On The Feasibility Of Storage Device Allocation And Storage Technique Of South China Grain Distribution Center

This design intends to build a 25 meters inner diameter squat silo with grain loading height 19 m, single-silo storage capacity about 7000 t and total storage capacity 42, 000 tons,which is loaded in the Guangdong South China food distribution center. Due to the project area is only 33 acres available, according to "the process flexible, save investment and improve efficiency" requirements and full use of land resources, reduce labor intensity, and optimize the process and improve the working environment, through the analysis process than election technology, technology and equipment configuration and other supporting facilities,the final selection of the silo wall floor, two side wall out grain reinforced concrete silo. Grain warehousing use fixed type conveying equipment, receiving unloading pit, warehouse top air cushion conveyor warehousing; warehouse equipped with mechanical ventilation systems,measurement and control system for grain situation, rich nitrogen transfer system, grain cooling system and circulation fumigation system, and equipped with cloth grain, spraying insulation materials, warehouse roof installed automatic sprinkler system and other process;grain storage sidewall dump and on the bottom of the bin grain scraping machine supporting mobile type conveying equipment is used.Mechanical ventilation system is by the mobile type centrifugal fan, an air duct, an air volume regulating device, an air distribution device, ventilation control device composed;each building shallow silo set ring geosynclinals ventilation duct group 2, unit of ventilation volume 8m3/h.t, each warehouse configuration 2 sets of centrifugal fan, fan power is 15 kw.The air cooling of grain surface is accomplished by axial flow fan, and 4 axial fan is arranged at the top of silo, and the power of blower is 12000m3/h, and the air quantity is 1.1KW. In addition, there are 4 natural ventilation holes in the top design of each shallow silo, and the grain area can also be slightly lower at night when the temperature of natural ventilation is natural.In grain monitoring system and the project according to the grain interior depending on the location of the humidity sensor and temperature sensor, on different positions of grain detection the humidity and temperature changes, again using digital sensor to change into electrical signal is transmitted to a signal processing circuit which, and the electrical signal into digital quantity to save, on location beyond the alert temperature alarm. The system can detect grain temperature at the moment, and adjust according to the actual situation in time.The working principle of the nitrogen rich gas technology is created by the use ofcomplete sets of equipment for mobile nitrogen, set and adjust the appropriate purity, pressure,temperature and flow into the barn, by installing in silo wall gas circulation pipeline and mobile circulation device make nitrogen in grain stack uniform distribution and diffusion.When the concentration of nitrogen in the warehouse increases to a certain degree, the maintenance of a period of time, damage to the appropriate living environment of insects and molds, can cause the pest suffocation. And the rich nitrogen gas transfer technology for the health of consumers, no pollution to the atmosphere, no damage to the food custodian.Grain cooling system can reduce the grain temperature, better balance of moisture content for grain storage and improve the grain security and stability, to maintain food quality and delaying aging, insect and mildew has created favorable conditions. The grain cooling machine is the core equipment of the system, which is composed of the airborne cooling system, the ventilation system and the post heating system.. The system is generally portable equipment, can realize a multi-purpose, multi warehouse public, improve the utilization of equipment, reduce investment.Recirculation fumigation technology is to place a circulation pipeline in the barn or warehouse, through pipelines to the circulation fan, gas diffuser and grain heap are connected into a closed loop. In the granary good air tightness, through the wind generated by the circulation fan, the fumigation out gas in bulk grain form a cycle, then let the gas is uniformly distributed in the barn, so as to achieve the purpose of killing pests. Fumigation system by the circulation fan, circulation pipe, valve, spraying device, gas sampling and detection device.Gas fumigation with phosphate and carbon dioxide mixed gas, the enhancement of gas penetrating and improving the medicament in grain pile of uniform distribution and prolong the residence time and reduce the residual amount.The feasibility study shows that the implementation of the project to solve the current shortage of storage capacity problem. In the condition of limited land resources construction in accordance with the requirements of the Guangdong Provincial Grain Reserve management ideal type of storage.