Formation and Control of Nitrogen Oxide in the Heating System of a Coke Oven

Weiß, Christian; Rieger, Johannes; Rummer, Bernhard

doi:10.1089/ees.2010.0464

Cited by 21 publications

(10 citation statements)

References 3 publications

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“…In addition, there are large temperature gradients of the gases in the normal direction of the coke oven walls. The latter two observations are also confirmed by the results presented in the literature (Weiss et al, 2012). The largest value of the oxygen molar fraction occurs in the inlet ducts as shown in Figure 11.…”

Section: Model Validationsupporting

confidence: 89%

“…Later reports by the same authors extended the steady-state formulation to the transient one by taking into account that the heat flux transferred from the heating flues to the coke chambers substantially changes over time (Nowak et al, 2010(Nowak et al, , 2011. Modeling of the heating system was also presented in the work of Weiss et al (2012), which addressed NO x reduction. The COG combustion was modeled in a quasi-steady state using a detailed chemistry mechanism combined with the eddy dissipation concept, within a real 3-D geometry.…”

Section: Introductionmentioning

confidence: 99%

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3-D periodic CFD model of the heating system in a coke oven battery

Smołka

Fic

Nowak

et al. 2014

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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Purpose -The purpose of this paper is to develop a 3-D fully transient numerical model of the heat and fluid flow associated with the chemical reactions that occur in the heating system of the coke oven battery. As a result, the model can be used to provide data for the control system of the battery to reduce energy consumption and emissions and to obtain a product of the desired quality. Design/methodology/approach -In the proposed model, an accurate representation of the heating flue geometry, the volumetric heat sources as a result of the coke oven gas combustion, the temperature-and mole fraction-dependent properties of the gases were taken into account. The most important part of the model was the unsteady boundary condition definition that allowed the modeling of the periodic heat delivery to the two oven heating walls, both in the coking and the reversion cycles. Findings -The temperatures obtained using the computational fluid dynamics (CFD) model showed the same pattern of temperature variations as that observed in the experiments. It was also found that the quality of the temperature variation predictions was highly dependent on the radiation model settings.Originality\value -The CFD models available in the literature describe the steady or pseudo-steady state operation of the heating system of the coke oven battery. The model developed in this work fully reflects the unsteady character of this heating system. Moreover, the proposed model is prepared for coupling with a model of the coking process that occurs in the two neighboring coke oven chambers.

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Section: Model Validationsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

3-D periodic CFD model of the heating system in a coke oven battery

Smołka

Fic

Nowak

et al. 2014

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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show abstract

“…All other species are considered as combustion intermediates and radicals. Prior CFD studies revealed the suitability of the Correa mechanism for the modeling of Blast furnace gas (BFG) combustion . Therefore, in both actually considered cases the above chemical reaction mechanism was implemented.…”

Section: Model Setupmentioning

confidence: 99%

Thermochemical Wear of Refractory Linings Associated With Gas Firing in Metallurgical Plants

Rieger

Drózd‐Ryś

Weiß

et al. 2013

steel research int.

Self Cite

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The present paper deals with the corrosive interaction between the atmosphere and the refractory lining as well as in one case the steel shell for two industrial facilities. In one of the following cases a magnesia carbon lining is partly decarburized by the atmosphere during preheating of a steel ladle. In the other case, the flue gas from blast furnace gas heating of a hot blast stove causes a nitric attack on the cold side of the refractory lining at the steel shell. Investigation of these mechanisms rely on computational fluid dynamics (CFD) simulations which quantify the flow and temperature field as well as the species transport during heat release from the gas combustion in both plants. Furthermore, the heat exchange between hot gas and refractory is estimated and thereby associated chemical reactions with/within the refractory material. In both CFD case studies a non‐premixed approach was applied to model the combustion process and to characterize the flue gas composition. The follow‐up reactions with refractory lining and the steel casing are discussed specifically for each case. The calculated oxygen content in flue gas during ladle preheating is estimated to 15%vol. The maximum heat transfer between hot gas and refractory takes place in the bottom region of the ladle due to convection. The radiative heat exchange plays the most important role in the zone of magnesia‐carbon lining. Within the investigation of carbon burnout kinetics limiting factors like diffusion and mass transfer coefficient of oxygen were defined and (partially) determined. The NO formation during the blast stove heating period strongly depends on the dome temperature which is an important blast process control value. Calculated NO emission loads showed promising agreement with real plant data and literature trends.

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“…Fossil fuel combustion yields large volumes of flue gas with various types of air pollutants, including nitrogen oxides (NOx) and sulfur dioxide (SO 2 ), which produce acid rain, regional haze, and risk to human health. , Therefore, air pollutants should be urgently controlled in China. For example, the emissions of coke oven flue gas yielded by coke oven gas combustion were approximately 40,000 m 3 ·h –1 per billion tons of coke, with flue gas concentrations of 50–600 mg·Nm –3 for SO 2 and 450–1200 mg·Nm –3 for NOx. , Various technologies have been developed to treat air pollutants.…”

Section: Introductionmentioning

confidence: 99%

“…The main component of NOx in coke oven flue gas is NO . The wet scrubbing method is unsuitable for directly treating NOx in coke oven flue gas because of the low solubility of NO.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Removal of SO₂ and NOx from Coal-Fired Flue Gas Using Steel Slag Slurry

Meng

Wang

et al. 2018

Energy Fuels

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A method for simultaneously removing sulfur dioxide (SO2) and nitrogen oxides (NOx) from coke oven flue gas using steel slag slurry was proposed. Due to the high removal efficiency of SO2, the effects of operation conditions on the removal of NOx were investigated emphatically. The results showed that the removal efficiency of NOx increased with an increase in steel slag slurry concentration, NOx oxidation ratio, steel slag slurry pH, and NOx and SO2 inlet concentrations and a decrease in reaction temperature. The removal efficiencies of SO2 and NOx could reach 100 and 83.4%, respectively, by optimizing the operation conditions. The mechanism of NOx removal using steel slag slurry was investigated. The results showed that (MgO)0.841·(MnO)0.159 (RO phase, a CaO–FeO–MnO–MgO solid solution) in steel slag was decomposed by H+ and produced Mg2+ and Mn2+. Furthermore, Mn2+ in steel slag slurry could promote the absorption of NO2 via redox reactions with the generation of solid Mn3O4 and MnO(OH).

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Formation and Control of Nitrogen Oxide in the Heating System of a Coke Oven

Cited by 21 publications

References 3 publications

3-D periodic CFD model of the heating system in a coke oven battery

3-D periodic CFD model of the heating system in a coke oven battery

Thermochemical Wear of Refractory Linings Associated With Gas Firing in Metallurgical Plants

Simultaneous Removal of SO₂ and NOx from Coal-Fired Flue Gas Using Steel Slag Slurry

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Formation and Control of Nitrogen Oxide in the Heating System of a Coke Oven

Cited by 21 publications

References 3 publications

3-D periodic CFD model of the heating system in a coke oven battery

3-D periodic CFD model of the heating system in a coke oven battery

Thermochemical Wear of Refractory Linings Associated With Gas Firing in Metallurgical Plants

Simultaneous Removal of SO2 and NOx from Coal-Fired Flue Gas Using Steel Slag Slurry

Contact Info

Product

Resources

About

Simultaneous Removal of SO₂ and NOx from Coal-Fired Flue Gas Using Steel Slag Slurry