Type of CHP system: Anaerobic digestion

Plant owner:

The biogas generation plant and the CHP plant are both owned by:

Linko Gas A.m.b.a.

Tornumvej 15

DK-6660 Lintrup

Denmark

www.linkogas.dk

Commissioned: (reconstructed):1990 (1999)

Status of plant: Commercial

Contractor: Krüger Ltd./Bioscan Ltd.

Power generation: Gas engine

Main fuel: Biogas

The plant converts 410 tonnes of animal manure and 137 tonnes of alternative digestible organic waste daily.

Nominal capacities & efficiencies:

Gross electrical output: 2,084 MWe

Heat output: 2,6 MJ/s

How is plant controlled: The CHP plant is controlled by the heat demand in the DH network.

Heat usage: Heating only

Energy usage:

The biogas produced is utilised at the CHP plant in Rødding, where two biogas fuelled engines generate electricity, which is fed into the grid and heat for the local district heating system.

At the plant a combined oil and biogas fired 900 kW boiler uses biogas for process heating.

Heat storage size: None m3

Fuel storage: Biogas storage capacity: 5,000 m3

Plant description:

The centralised co-digestion plant in Lintrup is one of the largest biogas plants in the world. It was built in 1989-90 and rebuilt in 1999, when the plant converted from mesophilic to thermophilic process and a post-digestion phase was established. This way, the potential of biogas production of the plant was increased by almost 50 %.

The plant is owned by LinkoGas A.m.b.a., an independent co-operative society with 60 farmers, the slurry suppliers, as members. The main aim of LinkoGas is to build and operate a manure based centralised co-digestion plant and thus to assist co-operative members in solving their problems concerning the legal demands of slurry storage capacity, handling and redistribution of the excess slurry and reduction of odour nuisance from slurry application.

The plant receives slurry and solid manure, consisting of 62% cattle slurry and 38% pig slurry, supplemented by digestible organic waste from fish and food processing industries, medicinal industry etc. The biomass is heated to process temperature through the heat exchanging system. Admixture of sewage sludge implies the pasteurisation of the biomass feedstock. This is achieved through a minimum guaranteed retention time of 12 days at the process temperature of 53°C, ensuring a pathogenic reduction equivalent to pasteurisation. After thermophilic digestion, the biomass is pumped to an insulated post-digestion tank, where digestion continues at 49°C.

The slurry suppliers receive the amount of digested biomass corresponding to the nutrient consumption of their crops. The surplus, about 15% of the digested biomass, is sold to 20 crop farms in the area. The biomass is transported directly to the 128 decentralised storage tanks, located close to the fields where the digested biomass will be applied.

The biogas is piped via a low pressure gas transmission system to Rødding CHP plant.

Digester capacity: 3 x 2,400 m3, post digestion: 2,400 m3

Residence time: 12

Process temperature: Thermophilic digestion at 53 deg. C, post-digestion at 49 deg. C

Annual gas production: 6,000,000

Specific gas yield: 30

Total capital cost: € 5,807,000

Government grant: € 2,240,000

Biogas plant: € 4,308,000

(Biogas production unit including pre- and post-storage tanks at the plant, pipeline and CHP plant)

Vehicles: € 408,000

Storage tanks at farms: € 317,000

Separation facilities: € 773,000

Data collected and quality assured by: FORCE Technology.

Contact person: Anders Evald