The effect of different operation modes of squat silo on the ventilation and temperature regulation of grain stacks
The squat silo has an extensive prospect in grain storage.The paper of ventilation and temperature regulation effect of conventional vertical ventilation system and new radial ventilation system can provide support for the actual grain storage process.In this paper,the grain type is soybean.The 14-day temperature regulation process of three different air ducts in squat silo under forward ventilation and reverse ventilation is numerically simulated by the finite volume method.The air flow and temperature distribution in the grain pile are obtained,and the ventilation cooling rate,uniformity and energy consumption are compared and analyzed.The results indicate that there is no ventilation dead corner in all ventilation modes,and the difference of ventilation modes leads to the difference of flow direction and vortex position.Under the positive and negative pressure form of vertical air ducts,there is no high temperature area in the squat silo for 7 days of ventilation,while the other two air ducts exhibit high-temperature areas.And there is no high temperature area in all working conditions for 14 days.Only when the air duct is radial,the cooling rate and final temperature of negative pressure ventilation are lower than those of positive pressure ventilation.The ventilation uniformity of radial air duct is better than the other two air ducts,and the uniformity of positive pressure ventilation is better than negative pressure ventilation.The energy consumption of positive pressure ventilation is generally lower than that of negative pressure ventilation.
vertical ventilationradial ventilationcooling and ventilationpositive and negative ventilationnumerical simulation
万方数据
维普
