Improvement of fuel oil spray combustion inside a 7 MW industrial furnace: A numerical study

Bonefačić, Igor; Wolf, Igor; Blecich, Paolo

doi:10.1016/j.applthermaleng.2016.08.218

Cited by 12 publications

(7 citation statements)

References 14 publications

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“…Calculations were applied according to the steady time solver. Modelling of non-premixed burners is commonly performed for applications such as burners for gas turbines, large scale oil burners, and internal combustion engines [11,26,40]. To the best of our knowledge, we believe that this is the first work using an advanced numerical modelling tool to analyze and identify key parameters for design and optimization of small-scale non-premixed diesel burners for heater application.…”

Section: Modellingmentioning

confidence: 99%

Modelling and Optimization of a Small Diesel Burner for Mobile Applications

et al. 2018

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While extensive research has been done on improving diesel engines, much less has been done on auxiliary heaters, which have their own design challenges. The study analyzes how to optimize the combustion performance of an auxiliary heater, a 6 kW diesel burner, by investigating key parameters affecting diesel combustion and their properties. A model of a small diesel heater, including a simulation of fuel injection and combustion process, was developed step-wise and verified against experimental results that can be used for scaling up to 25 kW heaters. The model was successfully applied to the burner, predicting the burner performance in comparison with experimental results. Three main variables were identified as important for the design. First, it was concluded that the distance from the ring cone to the nozzle is essential for the fluid dynamics and flame location, and that the ring cone should be moved closer to the nozzle for optimal performance. Second, the design of the swirl co-flow is important, and the swirl number of the inlet air should be kept above 0.6 to stabilize the flame location for the present burner design. Finally, the importance of the nozzle diameter to avoid divergent particle vaporization was pointed out.

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Section: Modellingmentioning

confidence: 99%

Modelling and Optimization of a Small Diesel Burner for Mobile Applications

et al. 2018

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“…It is generally believed that with decreasing spray cone angle at the same flow rate, the spray penetration distance will increase and the flame height will be greater. Bonefačić et al [17] conducted experimental studies on a 7 MW oil-fired boiler with different spray cone angles and found that a larger spray cone angle in such a large furnace could optimize the spatial distribution of droplets in the outlet area of the burner. San José et al [18] conducted experimental research on a lowpressure auxiliary air-fluid atomizer under different test conditions and found that the lower the spray cone angle, the greater the combustion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on flame and emission characteristics of a small flue gas self-circulation diesel burner with different spray cone angles

et al. 2022

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The problems of long flame and high pollution emissions in low-power burners are of wide concern in small heating devices. To solve this problem, a small diesel burner with self-circulation flue gas was designed herein. In order to obtain a deeper scientific understanding of the flame and emission characteristics of the burner with different spray cone angles, a numerical calculation method was used to investigate them. Reasonable flow, heat transfer, and combustion models were selected, and periodic boundary conditions were used to verify the feasibility of the numerical model. The results indicate that the flame length increases with increasing spray cone angle, and then the flame length basically stabilizes at 410 mm. The maximum flame temperature decreases slightly with increasing spray cone angle. Besides this, the NO emission of this small flue gas self-circulation burner decreases with increasing spray cone angle and is as low as 10 ppm at an 80? spray cone angle. In addition, the influence mechanism of the spray cone angle on the flue gas self-circulation ratio was analyzed from the physical aspect of the spray area and the chemical aspect of combustion. This study is of great significance to research on the flame morphology of small flue gas self-circulation burners and the selection of different spray cone angles.

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“…It is generally accepted that, with an increase in the spray cone angle at the same flow rate, the spray penetration distance decreases and the flame becomes wider and shorter. Bonefačić et al [10] carried out an experimental study on the nozzles in a fuel oil boiler and found that a larger spray cone angle can enhance the spatial dispersion of droplets at the burner's outlet region. Consequently, the flames become wider and shorter.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the effect of spray cone angle on the characteristics of horizontal jet spray flame under sub-atmospheric pressure

et al. 2020

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The burning state of a plateau environment is attracting more and more attention. In this paper, in order to have a deeper scientific understanding of diesel spray combustion and the characteristics of a flame under different spray cone angles in a plateau environment, experiments were carried out in a low pressure chamber. The flame morphology was recorded by a high speed video instrument, and the temperature change was recorded by a thermal imager and thermocouples. The MATLAB programming was used to process the video image of the flame, and the probability of its binarization was calculated. The results indicate that the flame becomes longer and wider under different pressures with the same spray angle. The variation is more pronounced at a smaller spray taper angle. The flame uplifted height characteristic is mainly negatively related to the atmospheric pressure. According to the normalized flame temperature and the dimensionless horizontal projection, the length can be divided into three regions. In the region of buoyancy flame, the dimensionless temperature varies with sub-atmospheric pressure more than with normal pressure. In addition, under different spray cone angle conditions, the law of variation in the normalized flame temperature under sub-atmospheric pressure is exactly opposite to that under normal pressure. This study is of great significance to the scientific research on flames in a low pressure environment, and the design of different fuel nozzles for application in a plateau environment.

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Improvement of fuel oil spray combustion inside a 7 MW industrial furnace: A numerical study

Cited by 12 publications

References 14 publications

Modelling and Optimization of a Small Diesel Burner for Mobile Applications

Modelling and Optimization of a Small Diesel Burner for Mobile Applications

Numerical study on flame and emission characteristics of a small flue gas self-circulation diesel burner with different spray cone angles

Experimental study on the effect of spray cone angle on the characteristics of horizontal jet spray flame under sub-atmospheric pressure

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