Biogas from energy crops

Biogas

The Term “Biogas” refers to the gas obtained from anaerobic fermentation of biological material. The chemical composition consits of: methane, hydrogen, carbon dioxide and various other gases.

 

Biogas can be obtained through:

  • energy rich compound and/or agricultural waste fermentation;
  • sluge fermentation from wastewater treatment plants;
  • anaerobic fermentation of agricultural and organic waste from landfills (landfill gas);

The energy obtained by this chain, biomass→biogas→thermal and electrical energy, constitutes renewable energy. Carbon dioxide expelled out into the atmosphere through biogas combustion, constitutes an almost equal amount to that assimilated by plants or animal feed in their vegetable phase. This chain is a closed carbon dioxide circuit, compared to fossil fuel (methane gas, coal, petrol) which when burned expell out carbon dioxide which had assimilated thousands of years before.

 

Using biogas as fuel ensures energetic self-reliance and the reduced consumption of fossil fuel, as well as being an effienct method to profit from waste management by using organic waste, thus cutting down on greenhouse emissions.

 

Biogas obtained from agricultural waste, energy crops and/or animal waste

In a cogeneration plant running on biogas obtained by agricultural waste, energy crops and/or animal waste fermentation, to consistently generate 1 MW of electrical energy during 8.200 hours per year, the anual amout required are the following:

  • 19.000 high efficiency silo-corn, grown on a 350 – 450 ha area or
  • 51.000 tons of bovine animal waste, or
  • 40.000 tons of organis waste.

 

dejectii-animaliere-v2

 

COGENERATION PLANT AT Moara – Vornicenii Mici, Suceava County

 

Moara Project is based on renewable energy sources to produce biogas (energy crops – field corn refuse and/or animal manure). The biogas is used in two GE Jenbacher engines to produce electricity and heat in high efficiency cogeneration;

 

The plant is situated on a 29.500 square foot area, with a biogas producing capacity of 2 MW/h and a total on-site electrical capacity of approx. 3 MW/h.

The technical solution for energy production consists in two GE’s Jenbacher cogeneration units JMS 420GS, with a total efficiency of 83.9%.

 

The biogas plant runs continuously, 365 days a year, as it is not possible to stop the fermentation process unless under certain conditions. During the night the biogas is storred in a gas tank. The two cogeneration engines produce thermal and electrical energy for 16 hours during the day, between 7,00-23,00, with a top biogas consumption of 1600 m3/hour.

 

proiectul-moara

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