Influence of external flue gas recirculation on gas combustion in a coke oven heating system

Gamrat, Stanislaw; Poraj, Jakub; Bodys, Jakub; Smołka, Jacek; Adamczyk, Wojciech

doi:10.1016/j.fuproc.2016.07.010

Cited by 35 publications

(9 citation statements)

References 19 publications

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“…J. Ke et al [8][9][10]simulated the large-capacity coke oven staged combustion to improve the temperature uniformity of the coke bed and reduce the NOx emission concentration. S. Gamrat [11] introduced the external flue gas circulation rate of 0.2 and NOx emission reduction of 50%. The control method of NOx in the combustion process flue-gas only reduces the content of NOx in the flue gas, but it is still unable to meet the environmental protection requirements.…”

Section: Introductionmentioning

confidence: 99%

Analysis and evaluation of the influence of heat storage material on coke oven flue gas exothermic process

et al. 2021

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Sufficient heat storage and proper flue-gas outlet temperature were prerequisites for selective non-catalytic reduction (SNCR) denitrification in coke oven regenerators. This work performed an energy balance analysis on the established regenerator model to obtain a new thermal storage evaluation index-Total thermal storage temperature (TTST). Furthermore, ten cases of thermal storage parameters were set to analyze the effects of thermal effusivity and thermal diffusivity on heat storage and transfer. The transient simulation results shown that the channel shape of the lattice brick limited the uniformity of fluid-solid heat transfer and temperature distribution during the 30min commutation period, and the temperature window (1100~1300K) suitable for SNCR denitration slowly moved down. The increase of thermal effusivity led to the rise of heat storage and reduction of flue-gas outlet temperature. However, the transform in thermal diffusivity did not contribute substantially to the heat storage performance. Besides, the temperature-time-height equation obtained by fitting was used for predicting the suitable location of SNCR denitration temperature. The TTST was positively correlated with the flue-gas outlet temperature and negatively correlated with the heat storage capacity. The TTST evaluated the effects of material properties on heat storage and flue gas outlet temperature.

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Section: Introductionmentioning

confidence: 99%

Analysis and evaluation of the influence of heat storage material on coke oven flue gas exothermic process

et al. 2021

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“…As the emission standards for NOx in the industrial boiler have become increasingly stringent, many low NOx emission techniques are studied and applied, such as lean premixed combustion, flue gas recirculation (FGR), and deep staged combustion, etc. (Gamrat et al, 2016;Hinrichs et al, 2018). The metal fibber lean premixed combustion is widely applied in the industrial boiler as a low NOx emission technique (Specchia and Toniato, 2009).…”

Section: Introductionmentioning

confidence: 99%

Investigations on the Effects of Flue Gas Recirculation on the Combustion Instability of a Premixed Flame for the Low Nox Emissions

Pan¹,

Zhu²,

Ji³

2022

Proceedings of Global Power &Amp; Propulsion Society

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The combustion instability has been a common problem accompany with the low NOx emission technologies in industrial premixed burner. The effects of flue gas recirculation ratio (FR) on the characteristics of combustion instability and NOx emissions of an industrial scale premixed burner were investigated with experiments and numerical simulation. The acoustic mode of the whole chamber was computed with a Helmholtz solver combined with CFD simulation. The NOx emissions significantly decrease with the increasing of the FR. As FR increases from 0% to 20% the NOx emission reduces about 85%. Four modes of pressure oscillations in the combustion chamber with different FRs were found in the experiment. The pressure oscillation exhibits combustion noise mode at low FRs (<10%) in which conditions the pressure oscillation amplitude is low and there is no distinct frequency. Two dominant pressure oscillation frequency ranging from 21Hz to 25Hz and ranging from 1Hz to 2Hz are observed under relatively high FRs. The first acoustic mode frequency is 5.3Hz~5.7Hz and the second acoustic mode frequency is 23.1Hz~24.1Hz which are close to the pressure oscillation frequencies observed in the experiment. The ultra-low frequency and high amplitude pressure oscillations are attributed the periodic overall extinguish and ignition of the flame under high FRs. The difference between the pressure oscillation frequencies and the acoustic cavity mode frequencies may be attributed to the interaction of the response of the flame and the cavity acoustic mode which can lead to mode transition.

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“…They concluded that the NO x emission of the radiant tube using the flue gas cycle is 7 times that of the conventional radiant tube. Stanislaw et al showed the significant effect of the considered flue gas recirculation on NO x formation reduction. Namely, the recirculation ratio of 0.2 resulted in 50% of the NO x reduction efficiency.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation and Improvement of Coke Oven Gas-Fired W-Shaped Radiant Tubes for NO_x Reduction

Wang

Li³

et al. 2020

Energy Fuels

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In this study, to solve the problem of excessive NO x emission of W-shaped radiant tube (WRT) burning coke oven gas (COG), the numerical calculation method was adopted to investigate the effects of N 2 and CO 2 as diluent gases in the air, CH 4 as a diluent gas in the fuel, and blast furnace gas as a diluent gas for COG on NO x emissions of WRT. Besides, a novel WRT (N-WRT) with a flue gas circulation structure was developed to reduce NO x emissions. Moreover, the effects of the nozzle diameter and nozzle location on the gas flow, temperature distribution, and NO x emission were analyzed and discussed in detail. The results shows that CO 2 as a diluent can inhibit the production of NO x more than N 2 . The high NO x emission of the COG-fired WRT is caused by a higher proportion of H 2 and CO in COG. The NO x production of the WRT is about 6 times that of the N-WRT, indicating the effect of circulating flue gas on reducing NO x emission is quite remarkable.

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Influence of external flue gas recirculation on gas combustion in a coke oven heating system

Cited by 35 publications

References 19 publications

Analysis and evaluation of the influence of heat storage material on coke oven flue gas exothermic process

Analysis and evaluation of the influence of heat storage material on coke oven flue gas exothermic process

Investigations on the Effects of Flue Gas Recirculation on the Combustion Instability of a Premixed Flame for the Low Nox Emissions

Numerical Investigation and Improvement of Coke Oven Gas-Fired W-Shaped Radiant Tubes for NO_x Reduction

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Influence of external flue gas recirculation on gas combustion in a coke oven heating system

Cited by 35 publications

References 19 publications

Analysis and evaluation of the influence of heat storage material on coke oven flue gas exothermic process

Analysis and evaluation of the influence of heat storage material on coke oven flue gas exothermic process

Investigations on the Effects of Flue Gas Recirculation on the Combustion Instability of a Premixed Flame for the Low Nox Emissions

Numerical Investigation and Improvement of Coke Oven Gas-Fired W-Shaped Radiant Tubes for NOx Reduction

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Numerical Investigation and Improvement of Coke Oven Gas-Fired W-Shaped Radiant Tubes for NO_x Reduction