The Assessment Of CH4 And N2O Emissions In Biomass CHP Systems | 72713
Journal of Bioremediation & Biodegradation
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The CO2 balances of Biomass CHP systems are decisively influenced by the supply chains of fuels as well as a plant's efficiency.
Another important influencing factor is the N2O and CH4 emissions which enter the exhaust gas due to incomplete
combustion. It is necessary to record the emissions of methane and nitrous oxide, which are produced during the combustion.
For the purpose of calculating CO2 equivalent emissions, the recommended factors of 298 for N2O and 23 for CH4 are taken
into account. Against this background, the λvalues of the different combustion processes and the exhaust gas fractions of N2O
and CH4 are measured. The C, H, N, O mass fractions of the respective biogenic fuel mixes are calculated by the measured
volume quantities, which can be converted into specific mass fractions by the standard densities and the molar masses. The
comparison shows that N2O emissions have negligible influence. The emission value of CH4 depends on the combustion
process, the gas-fuel ratio and the compression rate. The lowest CH4 emissions of 6.38 - 27.23 g/h are shown by liquid fuel
operation, regardless of the used fuel (biodiesel, rapeseed oil, palm oil, soy bean oil). The highest emission levels show up in the
dual fuel operation with bio-methane with maximum gas ratios in low-load operation with 5561.79 g/h - 6505.08 g/h, because
of unburned fuel fractions. The combustion of wood gas in Gas-Otto operation shows comparatively low emissions at 28.6 g/h.
Markus Brautsch is Full Professor for Thermodynamics, Energy Technology and Renewable Energies at the Technical University of Applied Sciences Amberg-Weiden since 1998. He is the Founder of the Institute of Energy Technology and the Bavarian Center of Excellence for Combined Heat and Power Generation. In 2014, he was appointed Guest Professor at the Jiangsu University of Science and Technology in China. He is Guest Lecturer at the Renewable Energy Center in Mithradam (India) and the University of Santa Caterina (Brazil)
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