The reason for the negative pressure is: First, when the material is discharged in a large amount, the pressure in the tank suddenly drops. Second, the air box of the biogas digester is not leaky, but the water leakage in the middle and lower parts of the fermentation room or between the feed and the discharge is more serious, which causes negative pressure.
Why do some of the methane tank pressure gauges have higher water columns, but soon after burning, the firepower weakens quickly and even turns off?
The position of the water column in the barometer is a measure of the pressure of the biogas in the digester, which does not fully explain the amount of biogas in the tank. Some biogas tanks have unreasonable design between the air box and the water pressure. When the biogas is generated, the pressure in the tank fluctuates greatly. The water column on the pressure gauge rises quickly, but the amount of biogas stored is not large. Therefore, when used, the biogas in the pool is rapidly reduced, the water column drops rapidly, and soon after the gas is used, the available biogas in the pool is used up.
How large is the diameter of the gas conduit?
The size of the inner diameter of the gas delivery catheter is determined according to the volume of the pool, the gas usage distance, and the use. For example, if the volume of the biogas digester is large, the gas volume is large, and the gas distance is longer, the internal diameter of the gas pipeline should be larger. The internal diameter of the gas pipeline used by general households is preferably 0.8 to 1 cm. Pipe diameter less than 0.8 cm resistance along the way, when the pressure is less than the stove (light) rated pressure combustion effect is poor.
How to check gas pipeline leak?
Unplug the gas pipe connected to the stove at one end, close the end of the gas pipe to the cooker by hand, pull the end of the gas pipe at the end of the gas tank, and blow the gas into the gas pipe. The U-type pressure gauge water column reaches 30 cm or more. Turn off the switch between the pipes sent from the digester to the cooker and observe whether the pressure drops. After 2 to 3 minutes, the pressure does not drop. The gas pipe does not leak, otherwise it leaks.
How to arrange gas pipeline?
(1) The length of the digester to the stove and the length of the pipeline should not exceed 30 meters in general;
(2) When the user has two biogas digesters, the biogas pipeline can be separately led from each biogas digester and laid in parallel. Alternatively, the diverter tubes of the two digesters can be connected to a total gas pipeline and then can be used to connect the three digesters. Indoor (main pipe inner diameter is larger than branch pipe inner diameter);
(3) Underground tunnels should generally be laid underground, and if there are difficulties in local application, they can also be laid along walls or overheads, but the height must not be less than 2.5 meters;
(4) The buried depth of underground pipelines should be less than 0.5 meters in the south and below the frozen soil layer in the north. All buried pipelines shall be provided with hard casing (iron pipes, bamboo pipes, etc.) or brick trenches so as to avoid pressure-deflecting gas pipelines;
(5) The laying of pipes should have a slope, and the general slope is about 1%. The slope of the pipeline is adapted to the terrain when wiring, and the gas-water separator should be installed at the lowest point of the pipeline. If the terrain is relatively flat, the courtyard pipe should be sloped to the digester;
(6) Don't be too rushed in the turning of the pipeline. There should not be less than 120 degrees in general.
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