Experimental Study of the Combustion Regimes Occurring in a Laboratory Combustor

Castela, Maria; Veríssimo, A. S.; Rocha, Ana Maura Araujo; Costa, Mário

doi:10.1080/00102202.2011.630592

Cited by 39 publications

(53 citation statements)

References 24 publications

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“…The low NO X emission of 10 ppm was achieved for the 2.1 air equivalence ratio under an air preheat temperature of 700 K and an inlet velocity of 160 m/s [66]. Experimental studies reported that a burner can operate stably with a higher excess air coefficient, that is, an increase in air inlet temperature [67]. When the air preheat temperature is between 1073 and 1273 K, the oxygen concentration, the fuel inlet temperature, and the flame volume remain constant [56].…”

Section: No X Emission In Ppmmentioning

confidence: 99%

Flameless combustion role in the mitigation of NO_Xemission: a review

Abuelnuor

Wahid

Mohammed

et al. 2014

Int. J. Energy Res.

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SUMMARYNitrogen oxide formation is one source of pollution emission in fossil fuel combustion. Numerous technologies, such as flameless combustion, have been introduced to prevent such formation. This paper presents a panorama of flameless combustion and its principles. The influence of this technology on air preheats and gas diluents is discussed, as well as the effect of the firing mode on thermal NO X . The benefits of flameless combustion, including its energy conservation capability and capability to reduce pollutant emissions such as NO X emission to overcome environmental dilemmas in combustion, are discussed in this paper.

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Section: No X Emission In Ppmmentioning

confidence: 99%

Flameless combustion role in the mitigation of NO_Xemission: a review

Abuelnuor

Wahid

Mohammed

et al. 2014

Int. J. Energy Res.

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“…As they leave the combustor, the hot products interact with the incoming reactants to form a more reactive mixture. Castela et al 174 conducted an experimental study to understand the combustion regimes occurring in an SPRF burner. [169][170][171] A few recent studies were performed to evaluate the performance of SPRF combustor considering ranges of operating parameters.…”

Section: Sprf Burnersmentioning

confidence: 99%

“…The analysis of the turbulent flame structure revealed that the flame is mainly in the thin reaction layer regime throughout the entire combustor. Castela et al 174 conducted an experimental study to understand the combustion regimes occurring in an SPRF burner. For a given preheat inlet temperature of air, the recorded data showed a considerable effect of increasing the air inlet velocity on the reduction of NO x emissions, as presented in Figure 6.…”

Section: Sprf Burnersmentioning

confidence: 99%

Frontiers in combustion techniques and burner designs for emissions control and CO₂capture: A review

et al. 2019

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Summary The use of fossil fuel is expected to increase significantly by midcentury because of the large rise in the world energy demand despite the effective integration of renewable energies in the energy production sector. This increase, alongside with the development of stricter emission regulations, forced the manufacturers of combustion systems, especially gas turbines, to develop novel combustion techniques for the control of NOx and CO2 emissions, the latter being a greenhouse gas responsible for more than 60% to the global warming problem. The present review addresses different burner designs and combustion techniques for clean power production in gas turbines. Combustion and emission characteristics, flame instabilities, and solution techniques are presented, such as lean premixed air‐fuel (LPM) and premixed oxy‐fuel combustion techniques, and the combustor performance is compared for both cases. The fuel flexibility approach is also reviewed, as one of the combustion techniques for controlling emissions and reducing flame instabilities, focusing on the hydrogen‐enrichment and the integrated fuel‐flexible premixed oxy‐combustion approaches. State‐of‐the‐art burner designs for gas turbine combustion applications are reviewed in this study, including stagnation point reverse flow (SPRF) burner, dry low NOx (DLN) and dry low‐emission (DLE) burners, EnVironmental burners (including EV, AEV, and SEV burners), perforated plate (PP) burner, and micromixer (MM) burner. Special emphasis is made on the MM combustor technology, as one of the most recent advances in gas turbines for stable premixed flame operation with wide turndown and effective control of NOx emissions. Since the generation of pure oxygen is prerequisite to oxy‐combustion, oxygen‐separation membranes became of immense importance either for air separation for clean oxy‐combustion applications or for conversion/splitting of the effluent CO2 into useful chemical and energy products. The different carbon‐capture technologies, along with the most recent carbon‐utilization approaches towards CO2 emissions control, are also reviewed.

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“…Suppression of thermal NO X is a better option for NO X control (Kumar et al, 2002(Kumar et al, , 2005Levy et al, 2004;Nicolle and Dagaut, 2006;Plessing et al, 1998). A low emission technique consisting of recirculation of large quantities of hot combustion products into fresh reactants to suppress the NO X formation, also known as flameless/mild combustion, has been identified as an effective technique by various researchers (Arghode et al, 2012;Castela et al, 2012;Katsuki and Hasegawa, 1998;Szego et al, 2009). It has been reported by Wunning and Wunning (1997),and Kumar et al (2002Kumar et al ( , 2005 that the internal recirculation of combustion products results in the dilution and preheating of fresh reactants, which helps in suppressing the formation of thermal NO X through a thermal route.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Emission Characteristics of Liquid Fuels in a Swirl Combustor

Reddy

Trivedi

Sawant

et al. 2014

Combustion Science and Technology

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Flameless combustion is an effective method to suppress CO and NO X emissions from combustion systems with improved combustion efficiency. Flameless combustion is achieved through simultaneous preheating and dilution of fresh reactants with internal recirculation of hot combustion products leading to a distributed reaction zone and uniform temperature distribution throughout the volume of the combustor. In the present study, a high-intensity swirl-based combustor operating with liquid fuel in a flameless combustion mode is developed for industrial applications and designed to run at atmospheric pressure conditions. Detailed investigations on the emission characteristics for various operating conditions in flameless combustion mode have been reported. The experiments have been carried out for a range of heat release rates varying from 5 to 10 MW/m 3 . Swirl flow pattern is achieved through tangential air injection to enhance the internal recirculation of hot combustion products into fresh reactants. Preliminary numerical studies aimed at understanding flow pattern in four different combustor configurations show that recirculation rate increases with an increase in the divergence angle of the combustor. This helps achieve flameless combustion mode. Recirculation rate increases with a decrease in the outlet diameter from 80 mm to 25 mm. Based on the degree of the combustion completeness, extended frustum of the cone-based configuration (60 • ) has been proposed to obtain low emission combustion mode with liquid fuels. Temperature distribution and emissions are measured and compared for different thermal inputs (heat release intensities) and air-preheat temperatures. Measurements of acoustic, CO, and NO X emissions show that these emissions are reduced by an order of magnitude when the combustor is operated in flameless combustion mode as compared to conventional combustion mode.

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Experimental Study of the Combustion Regimes Occurring in a Laboratory Combustor

Cited by 39 publications

References 24 publications

Flameless combustion role in the mitigation of NO_Xemission: a review

Flameless combustion role in the mitigation of NO_Xemission: a review

Frontiers in combustion techniques and burner designs for emissions control and CO₂capture: A review

Investigations on Emission Characteristics of Liquid Fuels in a Swirl Combustor

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Experimental Study of the Combustion Regimes Occurring in a Laboratory Combustor

Cited by 39 publications

References 24 publications

Flameless combustion role in the mitigation of NOXemission: a review

Flameless combustion role in the mitigation of NOXemission: a review

Frontiers in combustion techniques and burner designs for emissions control and CO2capture: A review

Investigations on Emission Characteristics of Liquid Fuels in a Swirl Combustor

Contact Info

Product

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Flameless combustion role in the mitigation of NO_Xemission: a review

Flameless combustion role in the mitigation of NO_Xemission: a review

Frontiers in combustion techniques and burner designs for emissions control and CO₂capture: A review