Because the fully enclosed coal bunker is a closed space, the ventilation in the bunker is not smooth, the working environment is bad, and there is coal dust explosion, so it is difficult to ensure the occupational health and safety of operators. At present, the ventilation design of fully enclosed coal bunker mostly adopts natural ventilation mode with ventilation louver at the lower part and ventilation skylight at the top. However, due to the huge volume of the coal bunker, the roof is made of colored steel plates. When it is hot in summer, the outside temperature is 40 degrees, the surface temperature of color steel plate is as high as 90 degrees, and the temperature in the warehouse is more than 50 degrees. Because of the high temperature of the roof color steel plate, the baking effect is formed in the silo, which greatly affects the natural ventilation effect from high temperature to low temperature, resulting in many problems such as poor ventilation, high temperature, large dust and bad working environment.
Originally, ventilation was not a problem, and ventilation window with fully enclosed coal bunker could be added. But the problem is that the dust in the warehouse can't overflow when it is ventilated. Generally speaking, it means that the wind can't get in and the coal dust can't get out, otherwise it will be difficult to meet the requirements of environmental protection. The ventilation design software of fully enclosed coal bunker can design a four-fold ventilation system in the middle, upper, lower and both ends of fully enclosed coal bunker according to the dominant wind direction, wind speed, coal bunker plane layout, coal bunker height, coal bunker size and physical characteristics of stored coal. And the air curtain ventilation belt was developed, which realized zero dust overflow during ventilation, greatly improved the ventilation condition of the fully enclosed coal bunker, and made the dust explosion and the occupational health and safety of the operators.