The distribution and change of temperature field will directly affect the gas production rate and gas production rate of the whole system. Biogas fermentation is greatly affected by temperature. In summer and autumn, the temperature of natural gas production, especially in winter, is low. The temperature of biogas fermentation raw materials is usually lower than 10 ℃. Biogas production is seriously affected. In order to meet the demand of natural gas supply throughout the year, it is necessary to strengthen the heat preservation work in winter and spring. The main measures are as follows:

　　(1)添加温粪

　　(1) Add warm feces

　　加入人粪肥、马粪或堆肥后的新鲜干草等发热量原料，适当提高池液浓度至10 ~ 12%;

　　Add the raw materials of calorific value such as human manure, horse manure or fresh hay after composting, and properly increase the concentration of the tank liquid to 10 ~ 12%;

　　(2)增加风障，降低温度消耗

　　(2) Increase wind barrier and reduce temperature consumption

　　沼气池建在背风处或建在沼气池的西北风壁上，也是降低温度消耗的简单方法;

　　The biogas digester is built on the leeward or the northwest wall of the digester, which is also a simple method to reduce the temperature consumption;

　　(3)秸秆覆盖保温

　　(3) Straw covering and heat preservation

　　用农作物秸秆或干草覆盖池塘也可以减少温度损失。

　　Covering ponds with crop straws or hay can also reduce temperature loss.

　　(4)覆盖塑料温室

　　(4) Covered plastic greenhouse

　　&;系列中&;沼气池，可建在动物圈塑料棚上，不仅有利于畜禽的冬季保温，也有利于池内材料的液体温度，是沼气池冬春季保温的最佳措施。

　　&The biogas digester can be built on the plastic shed of animal circle, which is not only conducive to the winter heat preservation of livestock and poultry, but also conducive to the liquid temperature of the materials in the digester, and is the best measure for the winter and spring heat preservation of biogas digester.

　　(5)提高料液温度

　　(5) Increase liquid temperature

　　有条件的最好能与太阳能热水器配套，用温水冲粪喂到池塘;

　　If possible, it is best to match with solar water heater, and use warm water to wash manure and feed it to the pond;

　　(6)挖沟防冷

　　(6) Trenching to prevent cold

　　如果条件允许，可以在沼气池周围挖50厘米宽、比冻土更深的沟槽，填满粪肥草保温材料，可以起到保持池内温度的作用。

　　If conditions permit, a 50 cm wide trench deeper than frozen soil can be dug around the biogas digester to fill with manure and grass insulation materials, which can play a role in maintaining the temperature in the digester.