NOx formation in combustion of gaseous fuel in ejection burner

Rimár, Miroslav; Kulikov, Andrii

doi:10.1063/1.4953745

Cited by 4 publications

(6 citation statements)

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“…The mechanism of NO x formation occurs at a temperature of about 1000 to 1300 K, and with increasing temperature the NO x concentration increases significantly. High flame temperature and large amounts of extra oxygen and nitrogen from air infiltration create suitable conditions for NO x formation [24]. In comparison with the results presented in the study by Poskart et al [8], lower concentrations of NOx were found during our experimental measurements.…”

Section: Emissions Of No Xsupporting

confidence: 80%

“…The mechanism of NOx formation occurs at a temperature of about 1000 to 1300 K, and with increasing temperature the NOx concentration increases significantly. High flame temperature and large amounts of extra oxygen and nitrogen from air infiltration create suitable conditions for NOx formation [24]. The use of an exhaust fan in the rotary tilting furnace reduces the flue-gas residence time, which means that CO molecules do not have enough time to burn out and are drawn off into the chimney.…”

Section: Emissions Of Noxmentioning

confidence: 99%

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Analyzing the Formation of Gaseous Emissions during Aluminum Melting Process with Utilization of Oxygen-Enhanced Combustion

Dzurňák

Varga

Jablonský

et al. 2021

Metals

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Oxygen-enhanced combustion (OEC) is a useful method for improving the efficiency of thermal plants and for decreasing greenhouse gas (GHG) emissions. Basic and modified burner designs utilizing OEC in the aluminum melting process in a rotary tilting furnace were studied. A combined approach comprising experimental measurement and simulation modeling was adopted aimed at assessing GHG emissions production. Reduction of up to 60% fuel consumption of the total natural gas used in the laboratory-scale furnace was achieved. The optimal oxygen concentration in the oxidizer regarding the amount of total GHG emissions produced per charge expressed as CO2 equivalent was 35% vol. Its further increase led only to marginal fuel savings, while the nitrogen oxide emissions increased rapidly. Using the modified burner along with OEC led to around 10% lower CO2 emissions and around 15% lower total GHG emissions, compared to using a standard air/fuel burner. CFD simulations revealed the reasons for these observations: improved mixing patterns and more uniform temperature field. Modified burner application, moreover, enables furnace productivity to be increased by shortening the charge melting time by up to 16%. The presented findings demonstrate the feasibility of the proposed burner modification and highlight its better energy and environmental performance indicators, while indicating the optimal oxygen enrichment level in terms of GHG emissions for the OEC technology applied to aluminum melting.

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Section: Emissions Of No Xsupporting

confidence: 80%

“…The mechanism of NOx formation occurs at a temperature of about 1000 to 1300 K, and with increasing temperature the NOx concentration increases significantly. High flame temperature and large amounts of extra oxygen and nitrogen from air infiltration create suitable conditions for NOx formation [24]. The use of an exhaust fan in the rotary tilting furnace reduces the flue-gas residence time, which means that CO molecules do not have enough time to burn out and are drawn off into the chimney.…”

Section: Emissions Of Noxmentioning

confidence: 99%

Analyzing the Formation of Gaseous Emissions during Aluminum Melting Process with Utilization of Oxygen-Enhanced Combustion

Dzurňák

Varga

Jablonský

et al. 2021

Metals

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“…When OEC technology is used, the amount of penetrating air (79% vol. N 2 ) increases the nitrogen concentration in the combustion chamber, thereby removing heat from the process and decreasing the combustion temperatures reached in the furnace [28,29]. Excessive air infiltration can, therefore, significantly lessen the advantages of using OEC technology and decrease the thermal efficiency of these furnaces.…”

Section: Introductionmentioning

confidence: 99%

Influence of Air Infiltration on Combustion Process Changes in a Rotary Tilting Furnace

et al. 2020

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Air infiltration into the combustion chambers of industrial furnaces is an unwanted phenomenon causing loss of thermal efficiency, fuel consumption increase, and the subsequent increase in operating costs. In this study, a novel design for a rotary tilting furnace door with improved construction features is proposed and tested experimentally in a laboratory-scale furnace, aimed at air infiltration rate reduction by decreasing the gap width between the static furnace door and the rotating body. Temperatures in the combustion chamber and oxygen content in the dry flue gas were measured to document changes in the combustion process with the varying gap width. Volumetric flow values of infiltrating air calculated based on measured data agree well with results of numerical simulations performed in ANSYS and with the reference calculation procedure used in relevant literature. An achievable air infiltration reduction of up to 50% translates into fuel savings of around 1.79 to 12% of total natural gas consumption of the laboratory-scale furnace. The average natural gas consumption increase of around 1.6% due to air infiltration into industrial-scale furnaces can thus likewise be halved, representing fuel savings of almost 0.3 m3 per ton of charge.

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“…The results of research available in literature show that a significant optimization of the working process of diffusion burners and an improvement of their characteristics can be achieved through the use of ejection schemes for the supply of oxidant to the combustion zone [23][24][25][26][27]. At the same time, the conditions of the organization of the ejection process determine the possibility of providing a more uniform temperature field at the burner exit, cooling the walls of the flame tube, increasing the combustion efficiency of the fuel and extending the range of stable operation in terms of thermal power.…”

Section: Introductionmentioning

confidence: 99%

“…When the burner is operating, the active stream is the jet of fuel flowing into the volume of the mixing chamber, and the air ejected from the atmosphere through the two contours of the purge holes forms a passive (ejected) stream. Burners of this type with a single-stage oxidant feed are widely used in high-temperature technologies for cleaning surfaces from pollution, construction, and agriculture [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of diffusion jet combustion in an ejection burner

et al. 2018

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In this work we present the results of computational and experimental studies on the burnout dynamics of diffusion gas jets in an ejection burner with a two-stage air ejection scheme. It is shown that usage of this scheme leads to an increase in the uniformity of the distribution of thermogasdynamic parameters at the burner outlet, an increase in the completeness of combustion of the fuel, and a more stable operation of the device.

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NOx formation in combustion of gaseous fuel in ejection burner

Cited by 4 publications

References 0 publications

Analyzing the Formation of Gaseous Emissions during Aluminum Melting Process with Utilization of Oxygen-Enhanced Combustion

Analyzing the Formation of Gaseous Emissions during Aluminum Melting Process with Utilization of Oxygen-Enhanced Combustion

Influence of Air Infiltration on Combustion Process Changes in a Rotary Tilting Furnace

Dynamics of diffusion jet combustion in an ejection burner

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