Investigation on Coherent Jet Potential Core Length in an Electric Arc Furnace

Tang, Guangwu; Chen, Yuchao; Silaen, Armin K.; Krotov, Yury; Riley, Michael F.; Zhou, Chenn Q.

doi:10.1002/srin.201800381

Cited by 13 publications

(4 citation statements)

References 19 publications

(51 reference statements)

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“…Other [1,7,11,12,16,22,[25][26][27][28][29][30] • • [2,6,14,23,24,[31][32][33][34][35][36] • [4] • • [13,[37][38][39] • [17,18] • • [19] • [20,21,40,41] •…”

Section: Coherent Jetmentioning

confidence: 99%

Optimization of Oxygen Injection Conditions with Different Molten Steel Levels in the EAF Refining Process by CFD Simulation

Thongjitr,

Kowitwarangkul,

Pratumwal

et al. 2023

Metals

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In electric arc furnace (EAF) steelmaking, oxygen jets play a crucial role in controlling stirring ability, chemical reactions, and energy consumption. During the EAF lifetime, refractory wear leads to a decrease in the molten steel level and an increase in the nozzle-to-steel distance, thereby negatively affecting the overall energy efficiency of the process. The objective of this study is to optimize the energy efficiency of the EAF refining process by adjusting the nozzle flow conditions and conducting an analysis of jet performance using computational fluid dynamics (CFD) simulation. Three types of injection jets were considered: the conventional jet, the CH4 coherent jet, and the CH4 + O2 coherent jet. The findings reveal that the shrouded flame of the coherent jet enhances jet performance by maintaining the maximum velocity, extending the potential core length, and increasing the penetration depth in the molten steel bath. To maintain the jet performance in response to an increased nozzle-to-steel distance resulting from refractory wear, transitions from the conventional jet to the CH4 coherent jet and the CH4 + O2 coherent jet are recommended once the nozzle-to-steel distance increases from its initial level of 1000 mm to 1500 mm and 2000 mm, respectively.

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“…Other [1,7,11,12,16,22,[25][26][27][28][29][30] • • [2,6,14,23,24,[31][32][33][34][35][36] • [4] • • [13,[37][38][39] • [17,18] • • [19] • [20,21,40,41] •…”

Section: Coherent Jetmentioning

confidence: 99%

Optimization of Oxygen Injection Conditions with Different Molten Steel Levels in the EAF Refining Process by CFD Simulation

Thongjitr,

Kowitwarangkul,

Pratumwal

et al. 2023

Metals

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show abstract

“…The literature [49,105,121,161,162] shows several models to determine a two-phase free jet. Especially the core length and the velocity reduction in the axial x-direction are part of these approaches.…”

Section: Free Jet-between the Nozzle And The Impact Zonementioning

confidence: 99%

The Challenge of Cleaning Woven Filter Cloth in the Beverage Industry—Wash Jets as an Appropriate Solution

2020

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Beverage production requires many different and complex unit operations. One crucial procedural step is filtration. Typical filters are filter presses, candle filters, membrane filters, belt filters, and drum filters, which require considerable hygienic precaution and the application of appropriate cleaning concepts. In the last decades, the hygienic design has become a central design feature of equipment in the beverage and food industries. Today, also correspondent concepts regarding filter cloth increasingly come to the fore. However, filter cloth cleaning is rapidly facing limitations. Complex filter geometries originating from different gauzes and sensitive polymeric materials hinder efficient cleaning. Additionally, extensive biological residues adhering to the filter surface increase the challenge of cleaning. The goal of this paper is to outline the cleaning of woven filter cloths systematically with a particular focus on beverages and correspondent biophysical interactions between filter and residue. Based on these elemental cleaning limits of filter cloths, this paper focuses mainly on jet cleaning as one of the most appropriate cleaning methods. The flow-mechanical properties are discussed in detail since these are precisely the parameters that, on the one hand, describe the understanding of the cleaning process and, on the other hand, show how a wash jet can be adjusted precisely. In contrast to conventional cleaning techniques, such wash jets are expeditious to adapt and offer the best prerequisites to enable demandoriented and optimized cleaning concepts. The latest research and approaches are enhancing jet efficiency and highlight their potentials for future process strategies.

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“…The coherent jet characteristics are influenced by the velocity, composition, and temperature of the shrouding fuel gas, and have been investigated by many researchers [9,10,11]. Tang et al [12,13] investigated the effect of fuel input on the coherent jet length for three different fuel types (i.e., blast furnace gas, natural gas, and coke oven gas), and the results indicated that low molecular weight or gas density of the shrouding fuel would increase the potential core length of the main oxygen jet. Further, Odenthal et al [14] proposed a coherent jet nozzle with a combustor structure that allowed the shrouding gas to burn in the combustor, with the high-temperature and high-speed combustion products enveloping the supersonic main oxygen jet and improving the impact capacity to the molten pool.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the Supersonic Combustion Coherent Jet for Electric Arc Furnace Steelmaking

2019

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Herein, a supersonic combustion coherent jet is proposed based on current coherent jet technology to improve the impact capacity of a coherent jet and increase the stirring intensity of the electric arc furnace (EAF) bath. Further, numerical simulations and an experimental analysis are combined to study the supersonic combustion coherent jet characteristics, including the Mach number, dynamic pressure, static temperature, vorticity, and turbulence intensity, in the EAF steelmaking environment. The results show that the supersonic combustion coherent jet exhibits stable combustion in a high-temperature EAF steelmaking environment. The supersonic combustion flame generated by the supersonic shrouding fuel gas can envelop the main oxygen jet more effectively than current coherent jets. Furthermore, the velocity attenuation, vorticity, and turbulence intensity performances of the supersonic combustion coherent jet are better when compared with those of the current coherent jet. The velocity core length of the main oxygen jet for the supersonic combustion coherent jet is 30% longer than that of the current coherent jet, resulting in an improved impact capacity and stirring intensity of the molten bath.

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Investigation on Coherent Jet Potential Core Length in an Electric Arc Furnace

Cited by 13 publications

References 19 publications

Optimization of Oxygen Injection Conditions with Different Molten Steel Levels in the EAF Refining Process by CFD Simulation

Optimization of Oxygen Injection Conditions with Different Molten Steel Levels in the EAF Refining Process by CFD Simulation

The Challenge of Cleaning Woven Filter Cloth in the Beverage Industry—Wash Jets as an Appropriate Solution

Characteristics of the Supersonic Combustion Coherent Jet for Electric Arc Furnace Steelmaking

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