Gas tank for biogas station

06 Mar 2021 14:07

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Since biogas production in a biogas plant fermenter is subject to fluctuations, a mandatory component of the facility is a biogas storage facility - a gas holder. It compensates for the production peaks of the biogas plant, and also optimizes the supply of the combined heat and power plant with the amount of biogas necessary for its stable and uninterrupted operation

There are built-in and external gas tanks operating in different pressure ranges: low, medium or high pressure gas accumulators.

Gas tank: built-in and external biogas storage

Depending on the design, the gas holder is integrated directly into the main fermenter of the biogas plant, the secondary fermentation tank and the biofertilizer storage after the biogas plant.

It is also possible to install an external gas tank, separate from the main production facilities. Such a gasholder must be gas-tight, resistant to pressure, ultraviolet radiation, temperature and weather conditions, which guarantees its safe operation.

The volume of biogas storage should be at least a quarter of the daily production rate of the biogas plant. In addition, the gas tank must be equipped with a system that compensates for changes in pressure, excess or reduced, in it.

Also, an obligatory component of a biogas plant is an emergency torch, which is necessary to eliminate the excess capacity of the biogas plant or to carry out maintenance of the cogeneration module of the station.

There are low, medium and high pressure gas tanks, with low pressure biogas storage being the most common option with an overpressure range of up to 30 mbar. They are built-in hemispherical containers made of special material and must comply with the prescribed safety requirements.

Medium and high pressure gas tanks are capable of accumulating and storing biogas under pressure from 5 to 250 bar in high pressure steel tanks and cylinders.

Built-in integrated gas tank

The gas holder, integrated into fermenters, storage tanks for biofertilizers after the biogas station, is made in the form of a gas-tight film cap. This hood is attached to the top edge of the corresponding production structure of the station and is installed with a support frame for better stabilization in the unfilled state.

This gasholder has two layers of protective film. Air is blown into the space between the layers of the film using an air blower in order to keep the top film in place.

Such biogas storage facilities are most often installed in biogas plants.

External biogas storage

External gas storage systems at a biogas plant operate in the same way as built-in gas tanks, and are also made of several balls of protective gas-tight film. Their advantage lies in the possibility of a more accurate measurement of the methane concentration in the biogas that is currently being produced. The disadvantage of external gasholders is that they take up additional space and represent a separate structure.

The volume of the biogas storage must be precisely matched to the rest of the biogas plant structure in order for the biogas plant to achieve optimum efficiency.

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