Comparative analysis of the energy balance of biogas utilization when applied in conventional systems and cogeneration systems

Biogasna postrojenja mogu biti izvedena kao mali pogoni za proizvodnju energije za sopstvene potrebe ili veliki energetski sistemi gde se produkovani biogas koristi za proizvodnju toplotne i električne energije koja se predaje u javnu elektrodistributivnu mrežu. U poslednje vreme sve veću primenu imaju tehnologije kombinovane proizvodnje toplotne i električne energije, sistem kogeneracije (engl. combined heat and power, CHP) iz biogasa. U radu je prikazana uporedna analiza energetskog bilansa iskorišćenja biogasa pri primeni konvencionalnih sistema i sistema kogeneracije za istu količinu ulazne energije. U drugom delu rada dat je primer proračuna energetskog bilansa biogasnog postrojenja za anaerobni tretman tečnog stajnjaka sa farme svinja kapaciteta 5000 tovljenika u turnusu.Biogas plants can be implemented as small power generation plants for their own needs or large energy systems where the produced biogas is used for the production of heat and electricity that is transferred to the public electricity distribution network. Recently, the use of combined heat and power generation (CHP) from biogas has been increasingly used. This paper presents a comparative analysis of the energy balance of biogas utilization when applied in conventional systems and cogeneration systems for the same amount of input energy. In the second part of the paper, an example of the calculation of the energy balance of a biogas plant for anaerobic treatment of liquid manure from a pig farm with a capacity of 5000 fatling in a turn is given