Numerical study of air staging in a coke oven heating system

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

doi:10.1007/s10098-016-1234-8

Cited by 24 publications

(3 citation statements)

References 27 publications

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“…Jin et al 26,27 also pointed out that large capacity coke oven with staged combustion could improve the heating uniformity of chamber temperature while reducing the NOx concentration in flue gas. When blast furnace gas is mixed with natural gas or converter gas, Proaj et al 28 and Weiss et al 29 ascertained that as the secondary air mass flow rate increases, NOx emissions decrease. Li et al 30 adopted low NOx emission technology which combines oxygen fuel combustion and staged combustion, achieving a reduction in NOx emissions from 1155 mg/m 3 to 87 mg/m 3 .…”

Section: Introductionmentioning

confidence: 99%

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%

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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show abstract

“…The results indicated that the emission concentration of NO was relatively influenced by the average temperature, maximum flame temperature, and temperature uniformity within the combustion chamber. Poraj et al [26] discovered that air-staging combustion technology has a significant inhibitory effect on NO generation through a study of the coke oven heating system. Paubel et al [27] proposed a novel burner suitable for low-calorific-value gas, which realized the non-premixed combustion of blast furnace gas, methane, and oxygen.…”

Section: Introductionmentioning

confidence: 99%

The Structural Design of and Experimental Research on a Coke Oven Gas Burner

Geng,

Jin,

Wang

2024

Sustainability

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A novel low-NOx burner was proposed in this study to achieve the stable and clean combustion of low- and medium-calorific-value gas and promote energy sustainability, and the influence of the gas pipe structure on the burner’s characteristics was studied with coke oven gas as a fuel. A 40 kW burner test bench was established to conduct cold-state experiments to investigate the influences of the gas pipe structure on the aerodynamic characteristics of the burner. We performed numerical simulations on both a 40 kW burner and a 14 MW prototype burner to investigate the thermal performance of the burners and their impact on low NOx emissions. The experimental results showed that increasing the deflection angle of the gas pipe nozzle direction relative to the circumferential tangent direction, the high-velocity zone and the high-concentration zone of the flow field move towards the central axis. Increasing the bending angle of gas pipe nozzle direction relative to the axis direction caused the high-velocity zone and the high-concentration zone to move upstream direction of the jet. The simulation reveals that the NO concentration at the exit cross-section of the combustion chamber of the 14 MW prototype burner is 17.00 mg/m3 (with 3.5% oxygen content). A recommended design structure of the burner was proposed, with a deflection angle of 0°and a bending angle of 0° for the No. 3 gas pipe, and a deflection angle of 15° and a bending angle of 30° for the No. 4 gas pipe.

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“…Vertical flues of each pair are connected at the top through a window in the partition wall [10]. In [11] coke oven gas can save 300-400 Nm3/hour by using reversal cycle modification in coke plant [12]. The gas and preheated air are fed to the base of the flues from where they move upwards under the influence of chimney draught.…”

Section: Introductionmentioning

confidence: 99%

Optimization of specific heating consumption of coke oven plant using flow meter calibration modification

Mahato¹,

Agarwal²,

Jain³

2023

3C Tecnología

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Coke oven plant produces coke which acts as a reducing agent in blast furnaces. So, coke is an important material which is also called as a reducing agent. Coke is basically used for manufacturing of steel materials and extraction of metals. In an integrated steel plant coke is a prime material for making high grade of steels. In this present research work, the calibration of flow meter is modified. By this modification of gas flow meter calibration coke oven gas flow reduced from 17100Nm3/hrs to 16900Nm3/hrs, such as 200 Nm3 on hourly basis saving without any extra manpower cost. The proposed method is also cost effective as it saves Rs 6483000 every month for producing coke. This methodology is also helpful for reducing the manufacturing cost of coke in a recovery type of coke plant and stable oven operation and prolongation of coke oven life. Future advancements in this technique will allow us to minimize the need for money, which will revolutionize the nation's economy.

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Numerical study of air staging in a coke oven heating system

Cited by 24 publications

References 27 publications

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

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

The Structural Design of and Experimental Research on a Coke Oven Gas Burner

Optimization of specific heating consumption of coke oven plant using flow meter calibration modification

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