On the effect of spray parameters on CO and NO x emissions in a liquid fuel fired flameless combustor

Sharma, Saurabh; Kumar, Rohit; Chowdhury, Arindrajit; Yoon, Youngbin; Kumar, Sudarshan

doi:10.1016/j.fuel.2017.02.102

Cited by 31 publications

(27 citation statements)

References 31 publications

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“…They observed a uniform thermal field in the furnace and no CO was found at the outlet of the furnace. Flameless combustion of liquid kerosene fuel is reported earlier by our research group for possible application in gas turbine applications (Reddy et al (2014(Reddy et al ( , 2015a(Reddy et al ( , 2013(Reddy et al ( , 2015b, Sharma et al (2017Sharma et al ( , 2018). High-intensity swirl generated through the tangential air injection helped create strong recirculation of hot combustion products and flameless combustion mode.…”

Section: Introductionmentioning

confidence: 77%

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Effect of CO₂/N₂ Dilution on Characteristics of Liquid Fuel Combustion in Flameless Combustion Mode

Sharma

Chowdhury

Kumar

2020

Combustion Science and Technology

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This paper presents the effect of CO 2 and N 2 dilution in the oxidizer stream on combustion and emission characteristics in a flameless combustor operating with kerosene and biodiesel as a fuel. The thermal input is varied from 30 kW (7.5 MW/m 3 ) -53 kW (13.3 MW/m 3 ) and inlet air temperature are varied from 300 K to 800 K. CO 2 /N 2 are added to dilute the oxidizer stream in a proportion of 15% of total air volume to reduce the O 2 concentration in the air stream. Reacting and nonreacting flow simulations show that the flow field improves significantly as both the flow velocity and temperature distributions become uniform. Distribution of the reactant dilution ratio becomes more uniform and a maximum value of R dil = 4.89 is achieved for 30 kW conditions. The reduced O 2 concentration in the oxidizer results in enhanced dilution of fresh air-fuel mixture thereby enables uniform temperature and flow field. For the air preheating case, CO 2 dilution does not affect the velocity and thermal fields significantly. The measured CO emissions are marginally increased due to CO 2 dilution; however, NO x emissions are significantly reduced. N 2 dilution results in increased levels of NO x , contrary to the perception of the inert role of N 2 addition even though the combustor operating temperatures are lower than 1800 K. The measurements of acoustic pressure emissions show a sharp decrease during flameless combustion mode.

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Section: Introductionmentioning

confidence: 77%

“…A pressure outlet condition is applied at the combustor exit. The details of the meshing and grid independence are discussed in Sharma et al (2017). For simulating kerosene combustion, a single surrogate compound C 12 H 23 is used.…”

Section: Methodsmentioning

confidence: 99%

Effect of CO₂/N₂ Dilution on Characteristics of Liquid Fuel Combustion in Flameless Combustion Mode

Sharma

Chowdhury

Kumar

2020

Combustion Science and Technology

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“…Previous researchers have explored the use of fuel nozzles in conventional burners, highpowered boilers, and reheating furnaces using theoretical and experimental methods [11,12]. It was found that the spray cone angle has important effects on flame height, width, temperature, and NO emission [13,14] because it affects the fuel distribution [15] and atomization state in the initial combustion area [16]. 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.…”

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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“…Reddy et al [23][24][25][26] and Sharma et al [27,28] studied the flameless combustion of liquid fuels in a laboratory-scale combustor aimed at increased recirculation of hot combustion products. A diverging conical combustor geometry with tangential air injection is used to create highintensity vortex and increase the residence times inside the combustion chamber.…”

Section: Introductionmentioning

confidence: 99%

Distributed combustion mode in a can-type gas turbine combustor – A numerical and experimental study

et al. 2020

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On the effect of spray parameters on CO and NO x emissions in a liquid fuel fired flameless combustor

Cited by 31 publications

References 31 publications

Effect of CO₂/N₂ Dilution on Characteristics of Liquid Fuel Combustion in Flameless Combustion Mode

Effect of CO₂/N₂ Dilution on Characteristics of Liquid Fuel Combustion in Flameless Combustion Mode

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

Distributed combustion mode in a can-type gas turbine combustor – A numerical and experimental study

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On the effect of spray parameters on CO and NO x emissions in a liquid fuel fired flameless combustor

Cited by 31 publications

References 31 publications

Effect of CO2/N2 Dilution on Characteristics of Liquid Fuel Combustion in Flameless Combustion Mode

Effect of CO2/N2 Dilution on Characteristics of Liquid Fuel Combustion in Flameless Combustion Mode

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

Distributed combustion mode in a can-type gas turbine combustor – A numerical and experimental study

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Effect of CO₂/N₂ Dilution on Characteristics of Liquid Fuel Combustion in Flameless Combustion Mode

Effect of CO₂/N₂ Dilution on Characteristics of Liquid Fuel Combustion in Flameless Combustion Mode