A new emission reduction approach in MILD combustion through asymmetric fuel injection

Sharma, Saurabh; Pingulkar, Hrishikesh; Chowdhury, Arindrajit; Kumar, Sudarshan

doi:10.1016/j.combustflame.2018.03.008

Cited by 43 publications

(53 citation statements)

References 46 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: 78%

“…Fuel is injected using a solid-cone type pressure swirl atomizer from the inlet end of the combustor. The location of the fuel injector is offset by 25 mm from the central axis of the combustor (Sharma et al (2018)). More details of the combustor geometry can be found in Reddy et al (2015a) and Sharma et al (2018).…”

Section: Computational Domain For Combustor Geometrymentioning

confidence: 99%

“…The location of the fuel injector is offset by 25 mm from the central axis of the combustor (Sharma et al (2018)). More details of the combustor geometry can be found in Reddy et al (2015a) and Sharma et al (2018). Details of air inlet diameters and exit diameters for different operating conditions of fuel injection pressures are summarized in Table 1.…”

Section: Computational Domain For Combustor Geometrymentioning

confidence: 99%

“…The thermal input is maintained at 30 kW (14N1). Fuel is injected asymmetrically due to the advantage of increased flame stability (Sharma et al (2018)). Figure 2a shows the axial velocity contour at the XY plane of the pure air-kerosene case (will be termed as non-diluted) for non-reacting flow conditions at 14N1.…”

Section: Distribution Of Axial Velocitymentioning

confidence: 99%

“…High-intensity swirl generated through the tangential air injection helped create strong recirculation of hot combustion products and flameless combustion mode. The flexibility of the developed combustor for kerosene, diesel, and biodiesel was studied by Reddy et al (2014) and Sharma et al (2018). They observed a different trend in gaseous emissions for biodiesel compared to other fuels.…”

Section: Introductionmentioning

confidence: 99%

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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: 78%

Section: Computational Domain For Combustor Geometrymentioning

confidence: 99%

Section: Computational Domain For Combustor Geometrymentioning

confidence: 99%

Section: Distribution Of Axial Velocitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Experimental research on NO emission with coal preheating combustion technology

Wen

Ouyang

et al. 2020

Asia-Pacific J Chem Eng

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Coal preheating combustion technology was adopted to achieve stable combustion and low NO emission of Shenmu semicoke, and an air‐staging method was also used to further reduce NO emission. A series of experiments have been launched on a 30‐kW coal preheating combustion test rig with a coaxial jet triple channel nozzle. In the study, coal preheated characteristics, combustion behavior, and the formation and destruction mechanisms of NO were discussed. Shenmu semicoke could be preheated up to a temperature above 840°C, and stable combustion was easily established; ~63% of the volatile and 59% of carbon were released and converted into coal gas in the self‐preheating burner. Flame images along the axis of the down‐fired combustor were gained, and the images was dark red without obvious flame fronts. The initial generation of NO in the near field of the preheated fuel nozzle exit had impacts on the NO emission, and lower initial NO generation might result in lower NO emission. By decreasing the inner secondary gas (air), increasing the external secondary air and adding CO2 in the secondary gas, the initial NO could be inhibited effectively, which finally controlled the NO emission. However, the CO emission might increase in turn generally. In the research, the NOX emissions were <180 mg/m3 (@6% O2) with the lowest <80 mg/m3. To achieve an optimal scheme of NO emission and CO emission, some adjustment methods need to be applied synchronously.

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Ethanol flameless combustion

Mardani

Mahalegi

Azimi

et al. 2022

Fundamentals of Low Emission Flameless Combustion and Its Applications

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A new emission reduction approach in MILD combustion through asymmetric fuel injection

Cited by 43 publications

References 46 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

Experimental research on NO emission with coal preheating combustion technology

Ethanol flameless combustion

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A new emission reduction approach in MILD combustion through asymmetric fuel injection

Cited by 43 publications

References 46 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

Experimental research on NO emission with coal preheating combustion technology

Ethanol flameless combustion

Contact Info

Product

Resources

About

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