Review on Reporting Method of NO_x for a Hydrogen Turbine

The fuel conversion for a stationary gas turbine from conventional LNG to hydrogen is recognized as a key technology for carbon neutrality in power generation. However, the present NO(x )reporting method does not properly evaluate NOx generated from hydrogen combustion. The current standard uses NOx, which has been corrected to the reference oxygen concentration(15%) after complete extraction of H2O from the exhaust gas. For a hydrogen combustion, the concentration of H2O and O-2 in the exhaust gas increases more than that of hydrocarbon fuels, resulting in over-reporting the actual NOx emission. In this study, under the operating conditions of hydrogen turbines currently being developed, NO(x )is calculated to be 39.6% over actual emissions affecting the environment. Therefore, it is very important and urgent to establish a new and appropriate NO(x )reporting method to accurately consider the characteristics of hydrogen combustion.