Case

AVK valves in new biogas plant in Denmark

The largest biogas plant in the northern part of Jutland has just been inaugurated. AVK has delivered 36 knife gate valves for the new plant, which is the size of 12 soccer fields

The new plant will primarily be producing biogas from local cattle and pig manure, industrial waste products and food leftovers. The plant is expected to treat 300,000 tonnes of biomass every year and it will be able to supply the natural gas network with approximately nine million cubic meters of bio methane. That corresponds to the consumption of gas in 6,500 residences or the annual consumption of 4,300 cars or 250 buses. The plant creates new jobs in the local area and when the plant is running completely, 10 employees will be hired.

Biogas manufacturing
Biogas is manufactured of organic waste which is biodecomposed in sealed off containers by means of bacteria. The bacteria that break down the biomass emit the gas which is used for energy purposes. In this form, the gas can be used directly for fuel to e.g. gas generators that produce electricity. Additionally, the gas can also be cleansed of i.a. CO2 and hydrogen sulphide so it becomes methane. As methane the gas can be used in the natural gas network.

The process
The production of biogas is initiated when fresh manure is mixed with industrial waste and food leftovers in the recipient container. Then the biomass is pumped into the reactors where it is heated to approximately 52 degrees. The biomass is kept in the reactors while the manure ferment and the gas is formed. The gas is discharged from the reactor containers and the degassed manure is pumped to storage containers where farmers can pick it up.

 

Use of by-products
The production of biogas minimises the emission of nitrogen. When manure is being degassed the dry matter in the manure is decomposed. Thereby, the manure contains a lower amount of organic nitrogen and a higher amount of inorganic convertible nitrogen. This means a larger part of the nitrogen is obtained by the plants and a smaller part of the nitrogen is washing out in the water environment. Therefore, the degassed manure is also of interest to the farmers and use of the degassed manure also have a positive effect on the yield.

The yearly production of biogas of the plant is corresponding to the annual energy consumption of 4,300 cars or 250 buses.

Knife gate valves help manure through the process
AVK has delivered 36 knife gate valves, of which 30 are installed in the manifold where the manure is collected and carried around the plant. A few valves are placed on the outside of the containers and are used to transport beets (the preferred food resource) directly into the process. Additionally, six valves are installed to fill and empty the plant's three heating modules.

The GrønGas Vrå plant is built in a cooperation between the energy company E.ON Danmark and the farmer Jens Peter Lunden.

AVK solutions

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