Influence of nitrogen contents in fuel and oxidizer on nitrogen oxide emissions during NG/O2 combustion

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-02-19 DOI:10.1016/j.csite.2025.105868

Wontak Choi , Seunggi Choi , Yonmo Sung

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引用次数: 0

Abstract

This study aims to understand the NO_x emission characteristics during pure oxygen (O₂) combustion of natural gas (NG) and to provide design data for application in forging furnaces. We numerically investigated the sensitivity of NO_x emissions to an up to 10 % increase in nitrogen (N₂) content of the fuel and oxidizer. According to the impact analysis, the two cases have a more adverse effect on NO_x emissions. The numerical model established in this study was verified using experimental results obtained by the International Flame Research Foundation (IFRF). In addition, the N₂ content of the fuel was fixed and the impact of NO_x emissions on the O₂ ratio (O₂/fuel equivalence ratio) was investigated. The calculated results for the temperature field, velocity field, and NOx concentration at the furnace outlet agree with the IFRF experimental results. As the N₂ content in the oxidizer and fuel increased, the NO_x concentration also increased. NO_x emissions were much higher with a larger amount of N₂ in the fuel than in the oxidizer. With fixed N₂ content in the fuel, NO_x concentration tended to increase as the O₂ ratio increased. As the N₂ content in the fuel increased, the tendency of the NO_x concentration to increase with the O₂ ratio became more evident. This study emphasizes the importance of minimizing the N₂ content in both the fuel and oxidizer during NG-O₂ combustion, and suggests that NO_x emissions can be effectively controlled by adjusting the oxygen ratio when N₂ is present.

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.