Because of the low temperature in the winter, rural biogas digesters are generally not used for gas production. People often neglect their daily management and are prone to unnecessary losses.
First, pay attention to the problem
1. In the winter, the water storage ring of the rural courtyard biogas digester, the material entering and discharging, and the water pressure should be covered and managed as usual to prevent humans and animals from falling into the pool and causing casualties.
2. When the outdoor temperature is below zero, the underground biogas digester is in semi-production or production stop state. At this time, open the top cover and remove the air pipe to prevent the slow expansion of the gas in the winter, or the leakage of biogas to cause indoor asphyxia. And the occurrence of a burning accident.
3. It is strictly forbidden for the old pool to have an empty stomach during the winter. Generally, two-thirds of the feed liquid is taken out for fertilization in winter, and then one-third of the fresh raw materials is added, which will play a role in fermentation and moisturizing in the pool.
4. At the end of the year, a new biogas digester was built. Normally no feeding is started before the year. It is easy to form wind-breaking phenomena. During the winter, the moisturizing and insulation measures in the pool should be strengthened. Usually, plastic film is covered on the top cover and the material inlet and outlet.
5. In the winter, pay attention to the top of the biogas digester, according to the actual situation in rural areas, take all effective measures to make the biogas digester safe winter.
Second, the treatment
1. During the winter season in Xinchi, there was no heat preservation measure, and the in-pool maintenance should be carried out before filling the pool in the coming year. The commonly used method is to spray water on the inner wall of the biogas tank (key storage room). After 10 minutes, there is a noticeable wet line pattern, indicating that the wind has cracked. In severe cases, the interior of the tank should be repainted with a 1:2 cement mortar powder 2 mm. Thick, but also brush the pure mud 3-4 times, the wind blows the lighter brush pure mud 3-4 times, then add the membrane conservation about 7 days to install the pool use.
2, film insulation, generally in the frozen before (December) in the biogas tank above a layer of plastic film, covering the area of ​​the pool body area of ​​1.2 - 1.5 times. It is also possible to build a small arch above the pool to absorb solar heat.
3. Insulation of the piles, in the winter, the hot crop stalks (grasses, straws, etc.) and hot excrement (cattle, etc.) should be piled up or piled up on the main body of the digester, in and out of the material inlet, etc., in direct contact with the outside world. Horses, donkeys, sheep droppings, etc.) Stacked manure should be humidified and covered. This will not only be beneficial to the heat preservation of the methane tanks, but also strengthen stacking, creating conditions for next year and fashion materials.
4. Build a solar energy heating ring, which is a kind of common biogas tank insulation method in rural areas. That is to build a pig house (sheep house) on the top of the biogas tank. A toilet is built in the corner and all the excrement channels are connected to the input port of the biogas tank. The front wall is 1.0 meters high and the back wall is 1.8 to 2.0 meters high. The side walls form an arc shape. The general building area is 16 to 20 square meters. In the winter, the plastic film is covered to form a solar energy heating ring. On the one hand, the growth of pigs and sheep is promoted. The aspect is conducive to the safe wintering of biogas digesters.
5. To build a “four-in-one†courtyard model, using biogas as a link, to connect solar greenhouses, pig houses, and toilets together so as to ensure that the biogas digesters can produce gas for a long period of time, so that the biogas digesters and pig breeding vegetables can be both Insulation can also be used comprehensively to promote a virtuous cycle of energy flow, material flow, and nutrient flow and achieve multi-level utilization. However, this model has certain limitations. It depends not only on the size of the farmer's courtyard and the angle of daylighting, but also on the economic strength of the farmer before it can be implemented.
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