Type of CHP system: Anaerobic digestion

Construction of the Kirchhorster biogas plant in Helpsen

Plant owner: GbR (civil law association = non-trading partnership); the company has of two owners

Commissioned: 2001

Status of plant: Commercial

Contractor details: Archea GmbH

Biogas CHP unit: Schell (80 kW) with Perkins-motor

Digester: Babcook

Power generation: Gas engine

Pilot injection engine

Main fuel: Biogas

Nominal capacities & efficiencies:

Gross electrical output: 0,08 MWe

Net electrical output: 0,079 MWe

Electrical efficiency, gross: 36 %

Overall efficiency, gross: 79 %

Gross-heat capacity by full load: < 28  MJ/s How is plant controlled:

The biogas plant generates a maximum of electricity to feed into the public grid and is limited by the amount of arising biomass input material.

Heat usage: Heating only

Energy usage:

Appr. 39% of the produced heat is used for the own production unit, additionally heat is used for barns,the residential and the neighbor building.

DH inlet temperature: 90 °C

DH return temperature: 70°C

Fuel storage:

The biomass plant storage facility has a capacity of max. 1000 m³ respectively 650 t. This corresponds to roughly 24 days of running at full load.

Plant description:

The biogas plant in Helpsen consists of one 80 kW CHP unit, a laying grafting-digesters of 200 m³ and 2 downstream storage digesters of 350 and 250 m³ (repository). The company uses liquid manure, renewable primary energy products and vegetable waste to produce biogas.

Fuel feeding system: Mechanical loading system

Digester capacity: 250 m³

Residence time: 28 days

Process temperature: mesophillic (49°C)

Annual gas production: 265000 Nm³

Specific gas yield: 120 m³ gas/ m³ feedstock

Gas quality: 53 % methane

Engine: pilot injection engine

Flue gas cleaning:

Dust removal via fabric filter system

HCL reduction by flue gas scrubber

NOx-reduction via selective catalytic reduction (SCR)

SO2/SO3 reduction also by flue gas scrubber

two-level process; wet-fermentation (dry substrate content: 16 %)

The plant produces appr. 1800 t fertilizer per year, which is used in agriculture and forestry.

Staff: Appr. 1,5 hours per day

Electricity sale info:

The German biomass-CHP plants, which feed the generated electricity into public grid, get a fixed amount of allowances per kWh (according capacity and year of commissioning) by legal restrictions – EEG -. This allowances decreases every year.

Data collected and quality assured by: Institute for Energy and Environment.

Contact person: Janet Witt