The rice to be dried must be cleaned first and then dried to ensure the quality of the supplied food and reduce the heat consumption. After drying, the grain must be slowed down for 24 hours and then cooled. When the grain in the counter-current cooling tower after deceleration is more than two-thirds, the grain layer should be ventilated, maintained at a certain height, and the grain should be discharged at intervals. After cooling, the grain temperature shall not exceed 5℃.
Ensure that the amount of cold air is appropriate, and particles are not allowed to be sucked out. For example, if equipped with a ventilation cabin to cool down, the air duct should be about 1.5-2 meters. The height of a general granary is 22.5 meters. Turn the grain surface during ventilation, and finally cover it with grass to prevent condensation.
Extended data:
Because of the different harvest seasons of various crops and the large temperature difference between north and south during drying, the drying effect and operating cost need to be considered. For example, coastal areas should try to avoid drying grains in low temperature and humid weather, otherwise the dehydration effect will be poor, the productivity will be low and the drying cost will be high.
Nearly half of the time in northern China is dry below 0℃. The lower the outside temperature, the higher the unit heat consumption and the higher the cost. Therefore, the outer wall and hot air pipeline of dryers operating below 0℃ in the north should be insulated to reduce heat loss.