Experimental study of operating parameters on the performance of a novel U-type radiant tube with dual flue gas self-circulation structures

Fan, Huanbao; Feng, Jianmin; Xie, Kai; Bai, Wei; Zhao, Yujie; Li, Weidong; Gao, Jun; Chang-peng, Liu; Yan, Dongyang; Zhao, Hongyu

doi:10.1016/j.applthermaleng.2022.118206

Cited by 7 publications

(1 citation statement)

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“…There have been many efforts to get more information, and numerical investigations and experiments are focused on different kinds of FIR burners. − The German company Walam uses the vacuum pump principle to achieve a 30% recirculation ratio (R%) and low NOx emission of 15 ppm or less. Shinomori et al investigated the impact of a quartz sleeve pneumatic structure on NOx emissions in a small boiler FIR burner.…”

Section: Introductionmentioning

confidence: 99%

Review and Perspectives of Novel Flue-Gas Internal Recirculation Combustion Technology for Low Nitrogen Emission: Fundamentals, Performance, Method, and Applications for Conventional Fossil Fuels and Sustainable e-Fuels

Zhu

Wang

2023

Energy Fuels

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Novel flue-gas internal recirculation (FIR) is gaining increasing attention owing to its overwhelming stable combustion and nitrogen oxide (NOx) reduction advantages. This paper aims to reveal the nitrogen reduction mechanisms in the exciting new FIR methods and discuss the main FIR techniques in terms of combustion performance. In particular, the basic concept and the nitrogen reduction mechanism of FIR are first introduced. Besides, three main categories of FIRs are reviewed in accordance with the characteristics and operation status of different devices. The analysis of 16 FIR systems suggests that the recirculation space, effective recirculation rate, and combustion ignition limit must be considered during the design process, in order to balance NOx reduction and combustion efficiency. The integrated FIR and external FIR can achieve NOx emission reductions of at least 20% and 15.5%−20%, respectively. The embedded FIR exhibits more outstanding NOx emission reduction performance, with NOx reduction ratios of up to 26.09%−65%. In addition, the influence elements of FIR on combustion efficiency and nitrogen reduction are also discussed. In conclusion, strategies aimed at enhancing the combustion performance of novel FIR burners are thoroughly delineated, and the challenges that need to be addressed are succinctly highlighted in a forward-looking perspective. This review is expected to clarify the NOx reduction and combustion characteristics of current FIR techniques and suggest a development direction for FIR design.

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