Case

AVK knife gate valves installed at new biogas plant in Denmark

The largest biogas plant in the northern part of Jutland, GrønGas Vrå, was inaugurated in 2016. AVK has delivered 36 knife gate valves for the plant, which is the size of 12 soccer fields.

The new plant will primarily produce 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 approx. nine million cubic metres of bio methane. This 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 up and running, 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 gas which is used for energy purposes. In this form, gas can be used directly as fuel for e.g. gas generators that produce electricity. Additionally, gas can also be cleansed of CO2 and hydrogen sulphide so it is converted into methane. Like methane, 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 biomass is pumped into the reactors and heated to approx. 52 degrees. Biomass is kept in the reactors while manure is fermented and gas is formed. The gas is discharged from the reactor containers and degassed manure is pumped into storage containers from which farmers can pick it up. 

 

Use of by-product

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

Knife gate valves help manure through the process

AVK has delivered 36 knife gate valves. 30 of the valves are installed in the manifold where manure is picked up and conveyed through the plant. A few of these valves are placed on the outside of the containers and are used to transport beets (the preferred food resource) directly into the process. Furthermore, six valves are installed to fill and empty the plant’s three heating modules.

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

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