Revisit flame modulation towards low-NOx and uniform thermal field in heating flue of a coke oven

Wang, Qiaowei; Shen, Qin-Li; Li, Xuegang; Xiao, Wen‐De

doi:10.1016/j.applthermaleng.2023.120522

Cited by 1 publication

(2 citation statements)

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“…The essence of NOx reduction strategies was to ensure the residence time for mixing, enlarge the practical contact opportunities of NH 3 and NO as much as possible, enhance the competitive advantage of NO reduction to NO production and realise the best SNCR process at a suitable temperature. Wang et al 34 have attempted to modulate the structure of the fuel inlet to dilute the fuel content for a further mitigation of NOx emission, and detailed insights into the flue gas flow and temperature distribution. Burzyn ́ski et al 35,36 optimised heating flue structure and operating characteristics of the coke oven to provide a substantial reduction of NOx emissions.…”

Section: Introductionmentioning

confidence: 99%

“…To capture and reproduce the coking behaviour of coke oven with external flue gas recirculation, a new numerical 34 2023 Constant Flue gas recirculation Coke oven gas Burzyński et al 35,36 2022 Coupled Flue gas recirculation Coke oven gas Mixed gas simulation method based on FLUENT UDF and FLUENT Scheme was used to develop the comprehensive model to reveal the coking behaviour of the coke oven with external flue gas recirculation, including reversing combustion mode, effective thermophysical formula, external flue gas recirculation model and result save rule of the coking data. The effect of the reversing period and the external flue gas recirculation ratio on the coking behaviour of the coke oven with external flue gas recirculation was innovatively examined.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation on coking process of coke oven with external flue gas recirculation

Wang,

Han,

Chen

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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The coking behaviour and NOx emission characteristics of the coke oven are of great significance for coke production. Based on the realisation k-epsilon turbulence model, the P-1 radiation model, the species transport model with eddy dissipation, and the thermal NOx model. A comprehensive model for traditional regenerative coke oven was established with reversing mode and external flue gas recirculation model considering temperature-dependent thermophysical properties. The convective term of model equations was the discretised using the second-order upwind scheme, while the others were applied by the central difference scheme. The coking behaviour of the coke oven with external flue gas recirculation was numerically solved through the SIMPLE algorithm, and the effects of reversing period and external flue gas recirculation ratio on the coking behaviour were explored. When increasing the reversing period, the mean temperature of the vertical flue increases, and the coking time decreases, but the temperature uniformity of the carbonisation chamber becomes worse. As the external flue gas recirculation ratio increases, the average temperature of the vertical flue decreases, and the NOx concentration at the outlet decreases, yet the coking time increases. These results would provide useful information for guiding the improvement of coke oven operation and reducing NOx emissions.

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Section: Introductionmentioning

confidence: 99%