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1. Ventilation pipeline inspection and maintenance. Condensation water is easily formed in the pipeline under low temperature conditions in winter, and the water collector must be observed and removed in time. In addition, as far as possible, the pipelines on the ground should be wrapped with rags, plastic films, etc. to prevent freezing cracks; leaks and aged pipes must be promptly replaced.
2. Inspection and maintenance of the digester wall. It was found that there was a crack in the pool wall and it must be repaired. During the repair, the tank will be emptied. After all safety measures are in place, reapply the mortar to the pool.
3. Increase the concentration. Feed the biogas digester to increase the feed concentration to about 15%, and use fresh pig manure, fresh cow dung and fresh sheep manure rich in nitrogen as raw materials for fermentation, instead of using dry straw, corn stalks and other fibers. Fermentation of raw materials to reduce the carbon-nitrogen ratio difference, accelerate the propagation of methane flora and promote gas production.
4. Warming and heat preservation
4.1 film insulation, in the winter before the biogas tank is covered with a layer of plastic film, covering the area is 1.2-1.5 times the pool area. It is also possible to build a small plastic shed above the pool to absorb solar heat.
4.2 Insulation of the piles. Before winter arrives, piles of hot crop straw (straw, grass, etc.) and hot excrement (horses, donkeys, sheep excrement, etc.) should be piled or piled above the digesters and pool covers. The manure of the earthworms must be moistened and covered with plastic film. This will not only be beneficial to the heat preservation of the methane tanks, but also strengthen stacking, which will create conditions for next year and fashion materials.
4.3 Build a solar energy heating ring, which is a kind of common biogas digester insulation method in rural areas. It is to build a pig house (cattle, sheep house) on the top of the biogas digester. A toilet is built in the corner. The front wall is 1.0 meter high and the back wall is 1.8. -2.0 meters, the side walls form an arc shape, general construction area of ​​16-20 square meters, in winter covered with plastic film, the formation of solar heating circle, on the one hand to promote the growth of pigs, cattle and sheep, on the other hand is conducive to the safe wintering of biogas digesters.
5. Precautions
It is not advisable to start a new pond in the winter. In winter, it is difficult to ferment with low temperature, and the effect of gas production is not good. Similarly, it is not appropriate to make large refueling in the winter. However, it must be noted that the biogas digester must not be used for fasting in the winter. The old pool can generally remove two-thirds of the feed solution for winter fertilization, and then add one-third of the fresh raw materials to ferment and warm the skin. The pool should be stuffed with straw and weeds for fermentation to prevent the pool from cracking. The stacking material will be removed in the coming year. In the case of biogas digesters with poor gas production, air ducts should be removed to prevent the slow production of gas in the winter to distort the pool, or the leakage of biogas can cause safety hazards.
Biogas digester management technology in winter
In the process of biogas fermentation, temperature is the key to affect the fermentation rate of biogas. The fermentation temperature is usually divided into three ranges: 46 to 60°C as high-temperature fermentation, 28 to 38°C as medium-temperature fermentation, and 10 to 26°C as normal-temperature fermentation. When the fermentation temperature is below 8°C, only a small amount of biogas can be produced. The relatively low temperature in winter is not conducive to biogas fermentation gas production. Therefore, before winter, rural methane tanks must take overwintering measures to ensure normal gas production. To do a good job in winter management, there are generally the following points:
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