A study on the evaluations of emission factors and uncertainty ranges for methane and nitrous oxide from combined-cycle power plant in Korea

摘要

In this research, in order to develop technology/ country-specific emission factors of methane (CH_4) and nitrous oxide (N_2O), a total of 585 samples from eight gas-fired turbine combined cycle (GTCC) power plants were measured and analyzed. The research found that the emission factor for CH_4 stood at "0.82 kg/TJ", which was an 18 % lower than the emission factor for liquefied natural gas (LNG) GTCC "1 kg/ TJ" presented by Intergovernmental Panel on Climate Change (IPCC). The result was 8 % up when compared with the emission factor of Japan which stands at "0.75 kg/TJ". The emission factor for N_2O was "0.65 kg/TJ", which is significantly lower than "3 kg/TJ" of the emission factor for LNG GTCC presented by IPCC, but over six times higher than the default N_2O emission factor of LNG. The evaluation of uncertainty was conducted based on the estimated non-CO_2 emission factors, and the ranges of uncertainty for CH_4 and N_2O were between -12.96 and +13.89 %, and -11.43 and +12.86 %, respectively, which is significantly lower than uncertainties presented by IPCC. These differences proved that non-CO_2 emissions can change depending on combustion technologies; therefore, it is vital to establish country/technology-specific emission factors.