First, the principle of gas flow Gas flow is a certain law. Under the influence of no external force, the gas with high density is located in the lower part of the container, the gas with small density is located in the upper part of the container; after the gas is always heated, the volume expands, the density decreases, the gas moves upwards; the volume of the gas is always reduced after being cooled As the density increases, the gas moves downwards.
Second, an important factor for good ventilation First, there is a certain flow rate through the gas in the pig house. Second, the gas entering the pig house should be evenly distributed to all areas in the pig house, and the fresh air should be fully mixed with the indoor air.
Third, the fermentation bed pigs gas 1 fermentation bed pig technology is the use of microorganisms, decomposition of pig manure produces a lot of heat, while the heat will be litter water evaporation into the air, gas exchange through the pigs , Complete the removal of water vapor and heat in the pig house. 2 Fermentation of the fermentation bed is an oxygen-consuming process. If the ventilation in the pig house is poor, microbial activity will be inhibited, and the ability to decompose feces will decrease. This will result in the accumulation of large amounts of feces on the fermentation bed, and the activity of anaerobic bacteria will increase. , Ammonia odor increase, the concentration of carbon dioxide in the pig house increased, and other unfavorable factors. 3 The density of air carrying a lot of water vapor is small and will continue to move to the top of the pig house. Therefore, the exhaust hole of the pig house should be on the roof of the pig house. If there is no vent in the pig house, the hot and humid gas will condense into water droplets on the roof, causing the water droplets to drip back, causing secondary evaporation of the moisture in the fermentation bed and increasing the working strength of the fermentation bed. 4 The exchange of gas is a flowing process, so there must be a constant flow of off-gas into the pig house. In Heilongjiang, because the average annual temperature is only 4.5 degrees - minus 6 degrees, most of the year is very cold, the air intake of the pig house should be higher, so that the cold air entering the pig house can be mixed with the air in the house first. After arriving at the body surface of the pig, the disease of the pig will not be caused by the cold air directly reaching the body surface of the pig.
IV. Ventilation Methods There are two methods for ventilation and ventilation. One is natural ventilation and the other is forced ventilation, such as the draft fan recommended in the fermentation bed or the cooling fan in the summer.
V. Natural Ventilation Design Natural ventilation is mainly dependent on the airflow through the pig house, that is, the flow of wind. Therefore, the design of the pig house should fully consider the use of natural ventilation. According to the geographical location of the farm and the local climate characteristics, the ventilation system of the pig house should be designed according to local conditions. (1) The pig house should be built in an open high place, away from any wind blocking obstacles. (2) The distance between pig houses should be large, which can reduce the spread of diseases among different pig houses. (3) The long axis of the pig house should be perpendicular to the local main wind direction. (4) The span of the pig house should not exceed 15 meters. (5) The design of vents is very important. The dimensions of the vent must be appropriate and must be installed in the correct position so that the incoming fresh air is evenly distributed and thoroughly mixed with the air in the room.
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