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Mechanical ventilation for grain storage is a grain storage technology that uses the wind pressure generated by the fan to send low-temperature and low-humidity air into the grain stack, so as to promote the humidity and heat exchange between the air inside and outside the grain stack, reduce the temperature and moisture of the grain stack, and improve the stability of stored grain. Therefore, any operation in which selected or temperature-regulated air is pushed into or out of the grain pile to improve storage performance is called ventilation. The functions of mechanical ventilation for grain storage are as follows:
First, create a low-temperature environment, and improve the performance of grain storage. Using a temperature season to ventilate grain stacks can reduce grain temperature and form a low-temperature state in grain stacks. This is not only beneficial to maintain the quality of the grain, but also can effectively prevent insects, inhibit the growth and development of mites and microorganisms, and reduce the number of fumigation and drug use, so as to greatly improve the performance of grain storage.
Second, balanced grain temperature, prevents moisture condensation. Due to the poor thermal conductivity of grain stacks and the change in ambient temperature, it is easy to form a temperature difference in the grain stacks, causing the redistribution of water in the grain stacks, which will make the moisture accumulate in the cold grain stacks and cause dew condensation, fever and mildew in the grain stacks, especially in the areas where the temperature difference between day and night is large or the seasonal temperature fluctuations are large. At this point, ventilation is not only cooling but through ventilation cooling and dampness, balancing grain temperature, preventing water transfer and the formation of grain dew or producing the phenomenon of top knot, hanging wall.
The 3rd, prevent high moisture grain to give off heat and reduce grain moisture. Moisture is one of the most important factors affecting grain storage stability. The grain of late autumn harvest is slightly tall moisture is limited because of the climate or drying ability, and cannot get in time, causing the grain to fever mildew likely during deposit. Using large air volume ventilation can reduce the harm of high moisture grain natural heating, take away the heat generated by mold, and reduce the mold growth rate so that it can be stored for a short time.
Source: Online/GFMM
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