A Study on the N₂O Reduction Rate According to Temperature and Residence Time in the Exhaust Gas Atmosphere Emitted on Combustion of Air and Oxygen

Abstract

N 2 O is a hazardous greenhouse gas. It should be reduced to solve global warming problems. In this study, experiments of N 2 O thermal decomposition were conducted by simulating the exhaust gas atmosphere emitted during the combustion of air and pure oxygen in an actual circulating fluidized bed system and incinerator system. As a result of comparing the N 2 O reduction rate in N 2 and CO 2 atmospheres, the N 2 O reduction rate in the CO 2 atmosphere was 20% higher than that in the N 2 atmosphere. It is judged that the N 2 O reduction rate is high in a CO 2 atmosphere (exhaust gas from pure oxygen combustion) due to complex factors such as the reverse reaction, the diffusion coefficient, and static pressure-specific heat. Therefore, pure oxygen combustion increases the reduction rate of nitrous oxide. In addition, when operated with an appropriate residence time and temperature, a reduction effect of more than 95% can be expected, and the fuel consumption rate is also expected to improve.

Impact of K-H Instability on NOx Emissions in N2O Thermal Decomposition Using Premixed CH4 Co-Flow Flames and Electric Furnace

“…(R = 0.72). (19) Drawing from the detailed outcomes of this research, our findings are expected to significantly inform the development and operational strategies of combustion systems tailored for N 2 O reduction processes. This entails designing and managing these systems to optimize their functionality while substantially lowering NO x emissions.…”

“…The core reaction in N 2 O decomposition is a third-body reaction, where gases like N 2 , O 2 , CO 2 , and H 2 O act as catalysts, accelerating the process [18]. This reaction has shown increased efficiency under diverse atmospheric conditions, especially in CO 2 and N 2 environments [19,20]. These findings highlight the critical role of atmospheric composition in optimizing N 2 O decomposition, particularly at higher temperatures.…”