Biogas tank maintenance technology

How to judge whether the biogas leak leaks?
In the test of water and pressure, when the water column in the water column pressure gauge rises to a certain position, if the water column first decreases quickly and slowly, it indicates that the water leaks; if it drops at a more uniform speed, it is a leak.
If you do not use gas at ordinary times, if you find that the water column in the pressure gauge not only does not rise, but drops, or even negative pressure occurs, this indicates that the digester has leaked; the movement of the water column stops or moves to a certain height and does not change, indicating that the digester leaks or is slightly Leakage.
How to find out where the biogas pool goes wrong?
Should first check the distribution of trachea, parts, check the interior of the digester, gradually eliminate the doubt, identify the reasons, and then symptomatic repair.
The external inspection method is as follows: Put the rubber tube of the switch well, one end is tightly tied with a rope, put into a basin filled with water, one end is pumped into the air with a pump (or with a mouth), observe the hose, switch, connector No bubbles appear, where there are air bubbles, there are leaking holes. In use, it is also possible to use a brush to apply soapy water to the air pipes, air pipes, and joints to see if bubbles are generated. Goose and duck fluff can also be used to move back and forth between air pipes, air pipes and connectors, and switches. If air leaks, the fluff will be blown by the leak. In addition, the air-guiding iron pipe and the cover of the pool cover, the joints of the movable cover seat is also easy to go wrong, should pay attention to inspection.
The internal inspection method is: Into the pool to observe the pool wall, pool bottom, pool cover and other parts with or without cracks, holes. At the same time, tapping on the inside of the pool with a finger or a small wooden stick. If there is an empty sound, it means that the painted cement mortar shell. The feed pipe, the connection between the discharge room and the fermentation are also prone to cracks and should be carefully examined.
What are the common locations and causes of leaks and leaks in biogas digesters?
First, the concrete ingredients were not qualified, the mixing was not uniform, the pool walls were not firmly built, the pool wall was inclined or the concrete was not densely packed, and there were holes or cracks. Secondly, the mortar at the junction between the pool cover and the pool wall is not full, resulting in air leakage due to poor adhesion. Third, cement mortar and stone materials at the stone joints are not firmly bonded. When this happens, the mortar is not full and the pressure is not tight. Fourthly, after the pool was built, the pool was subjected to strong vibrations, which caused the cement mortar to crack or fall off at the joints. Fifth, after the ponds were built, the maintenance was poor. After the large discharges, the water was not fed in time and the feed was received. Cracks occurred after exposure to the sun and frost. Sixth, the backfill surrounding the pool wall was not filled tightly. After pressure testing or gas production, the pressure inside and outside the pool was not balanced, causing the stone to shift. Seventh, the quality of the paint on the pool wall and the pool cover is poor, the capillary pores are not well closed, or the shells are not firmly bonded to each other. Eighth, the concrete structure of the pool wall, often due to the improper proportion of concrete and moisture content, after drying, shrinking strongly, there are cracks; after the completion of the biogas digester, the concrete does not reach the required curing period, they rush to feed, due to the lack of concrete strength, Causes cracks. Ninth, the cement mortar at the joint between the air pipe and the pool cover is not solidified, or the air is leaked due to large vibration. Tenth, when a methane tank tests water, tests pressure, or enters or discharges a large amount of material, the speed is too fast and the positive and negative pressures are too large, causing the pool wall to crack or even swell the tank.
How to repair a methane tank?
Check the exact location of the leakage and air leakage of the biogas tank, mark it, and repair it according to the specific conditions.
First, cracks should first be cut into V-shaped seams, and the surrounding areas should be labeled as wool-faced. Then, a 1:1 cement mortar should be used to fill the leaks, compacted and wiped, and then painted with pure cement slurry several times. Second, peel off the paint layer from the air box, shovel off the shell, and repaint it carefully. Third, if the leak is not clear, the gas tank should be washed clean, with pure grout or 1:1 cement mortar alternating painting 3 to 4 times. Fourth, air leaks at the connection between the air pipe and the pool cover, which can be re-bonded with cement mortar and heightened and enlarged. Fifth, if there is a crack at the bottom of the pool sinking or at the joint between the bottom of the pool and the pool wall, the crack shall be first removed by a width of 2 cm and a depth of 3 cm around the tank, and poured in the bottom of the tank and in the surrounding tank. 1 layer of concrete about 4 to 5 cm thick, making it a connection as a whole. Sixth, due to swelling and shrinkage of expansive soil caused by biogas digester pool, should be placed in the pool cover and feed pipe, the upper edge of the discharge area on the three soil, in order to maintain the stability of dry soil moisture.

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