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
Status of plant: Commercial
Contractor details: Archea GmbH
Biogas CHP unit: Schell (80 kW) with Perkins-motor
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
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
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.
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