Combustion of biogas in greenhouses releases carbon dioxide, which is usually 100 square meters with a biogas stove, or a biogas lamp installed every 50 square meters. It should be carried out around 30 minutes after sunrise every day. The average speed of carbon dioxide gas burning and burning is about 0.5 cubic meters per hour. Based on this calculation, the time required for the combustion of biogas with different volumes of greenhouse gases is increased. Generally, the method of intermittent firing is applied. Each time it is released for 10-15 minutes, it is intermittent for 20 minutes, and it is stopped 30 minutes before the release of air. A greenhouse with a length of 30-50 meters can be spotted with a 6-inch biogas lamp (after one hour, the indoor carbon dioxide concentration can be increased by 500-1000 ppm). When the room temperature rises to 25 °C -30 °C, the greenhouse can be opened.
Attention should be paid to the following issues: (1) Biogas must be desulfurized. Because the biogas contains some hydrogen sulfide corrosion equipment, it will produce sulfur dioxide after combustion, and will be hydrated into sulfuric acid, poisoning plants. 2 Ignite the biogas lamp. The stove should be conducted when the temperature is low in the early morning. 3 After the application of carbon dioxide gas fertilizer, the photosynthesis of vegetables will be strengthened, and the water and fertilizer management must keep up with it in order to achieve a better effect of increasing production. 4 The burning time of the biogas stove in the shed can not be too long, otherwise too much carbon dioxide gas fertilizer will adversely affect the crop growth. 5 It is not possible to stack biogas fermentation raw materials in greenhouses, or to release ammonia, which is toxic to crops.
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