Abstract:
In order to study the application effectiveness of mechanical ventilation technology in ultra-high and large warehouses, vertical ventilation experiments were carried out in super-large flat warehouses with a height of 8 m and high-rise warehouses with a height of 6 m. The stored grain was wheat. The length of the warehouses was 60 m and their width was 30 m. The air duct of the ventilation system was one machine and three lanes on the ground. They were arranged in two directions and the same type and quantity of fans were used. The ventilation effectiveness such as ventilation uniformity of the vertical ventilation system, temperature of the grain in the ventilation process, and distribution of moisture were studied. The results showed that the average variation coefficient of static pressure value of each grain layer and the apparent coefficient of wind speed of the grain surface in 8 m warehouse were less than those in 6 m warehouse, and the uniformity of ventilation was better than that of 6 m warehouse. The moisture reduction in 8 m warehouse was smaller at the same time of ventilation, and its’water retention was better. The cooling range of 6 m warehouse was larger, and the cooling rate was faster.