Stability and emission characteristics of nonpremixed MILD combustion from a parallel-jet burner in a cylindrical furnace

Cheong, Kin-Pang; Wang, Guochang; Wang, Bo; Zhu, Rong; Ren, Wei; Mi, Jianchun

doi:10.1016/j.energy.2018.12.146

Cited by 39 publications

(43 citation statements)

References 28 publications

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“…Under these circumstances, the use of both fuels and the blends among them, along with flameless combustion technology, can be a promising strategy to reduce the thermal energy consumption. There are many studies focused on the use of fossil fuels at flameless combustion regime (5)(6)(7)(8)(9)(10)(11)(12)(13) as well as in mixtures of them with H2 (14)(15)(16)(17)(18) but is more limited the reported studies with use mixtures between natural gas and syngas and much scarcer if industrial or semi-industrial furnaces are considered as experimental devices.…”

Section: Introductionmentioning

confidence: 99%

Regenerative furnace simulation under flameless combustion regime with natural gas and syngas

Yepes

Cardona

Arrieta

et al. 2021

inycomp

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The increase in pollutant emissions has generated the development of clean technologies and encouraged the use of alternative fuels like syngas. Flameless combustion is one of the most promising clean technologies due to lower pollutants emissions and high thermal efficiency. In the present study, regenerative furnace simulation under flameless combustion was carried out using a fuel mixture of 70% natural gas and 30% syngas with high H2 content (in vol.); by mean of CFD approach. A symmetrical mesh with 405,632 hexahedral cells was used in the calculations. The κ-ε standard, discrete ordinates and Eddy Dissipation Concept models were used for physical phenomena of turbulence, radiation and turbulence - chemistry interaction, respectively. The combustion chambers thermal uniformity factor was 0.3 and 0.1 for vertical and horizontal planes, respectively. The results confirm that it is possible to achieve the flameless combustion regime in a regenerative furnace using the addition of syngas, preserving the temperature and reaction zone uniformity.

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Section: Introductionmentioning

confidence: 99%

Regenerative furnace simulation under flameless combustion regime with natural gas and syngas

Yepes

Cardona

Arrieta

et al. 2021

inycomp

View full text Add to dashboard Cite

show abstract

“…One of the requirements of establishing flameless mode is to increase the temperature of the reaction zone to be above the auto ignition temperature of the fuel mixture. Aided by strong recirculation of hot flue gas inside the combustion chamber, a conventional flame can be transformed into flameless combustion [8,9].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Multiple Swirl Generator Inlets Circumferential Distribution to a Liquid Fuelled Ultra-High Swirl Flameless Combustion Characteristics

Kasani

Wahid

Ghazali

et al. 2020

ARFMTS

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This paper presents the experimental results of a simple cylindrical shaped, liquid fuelled flameless combustor which utilizes ultra-high swirl flow in the combustion process. 4 different swirl generator inlet configurations were tested in this work. Ethanol fuel were used during flameless mode. The experiments were conducted at equivalence ratio (F=1), with the flow rate of fuel set at 4.48*104 kg/s, and flow rate of air at 3.854*103 kg/s. The results revealed that by using all 12 tangential air inlets (swirl generator injectors), the swirl strength was reduced through evenly distributing the position of the injectors circumferentially. As a result, the combustor successfully suppressed the emission of NOx and CO to zero ppm for both gasses. It was also reported that flameless mode was established in all configurations, regardless of the swirl strength.

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“…The dual parallel jet is widely used in fluid energy transmission [ 1 ], atomic energy conversion [ 2 ], dynamics [ 3 ], chemical industry [ 4 ], aviation [ 5 ], and other fields. And as an important actuator of the dual parallel jet, the nozzle has a great influence on electrostatic distribution [ 6 ], three-dimensional (3D) bioprinting [ 7 ], electro-osmotic fluid flow [ 8 ], jetting performance [ 9 ], metal microcomponents picking [ 10 ], energy transport, chemical combustion and pollutant generation [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Non-Structural Parameters on Dual Parallel Jet Characteristics of Porous Nozzles

Zhang

Yang

et al. 2020

Micromachines

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As an important actuator of the dual parallel jet, the porous nozzle has some non-structural parameters (such as inlet pressure, nozzle spacing ratio, etc.) which have a significant influence on energy transport, chemical combustion and pollutant generation. The research on the microfluidic state of the porous nozzle dual parallel jet, however, remains insufficient because of its microjet pattern and complex intersection process. In this paper, the authors used numerical simulation and an experimental method to clarify the influence of porous nozzles’ non-structural parameters on dual parallel jet characteristics. The results show that the inlet pressure only changes the pressure peak value on the parallel jet axis; the starting point (SP) and peak point (PP) on the parallel jet axis, which are located at Xsp = 22 mm and Xpp = 75 mm, respectively, are not changed; and with the increase in the nozzle spacing ratio, the merging points (MPs) on the parallel jet axis are Xmp = 25 mm, 32 mm and 59 mm, respectively. The merging point and the combined point move to a farther distance and the inner deflection angle of the jet is weakened.

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Stability and emission characteristics of nonpremixed MILD combustion from a parallel-jet burner in a cylindrical furnace

Cited by 39 publications

References 28 publications

Regenerative furnace simulation under flameless combustion regime with natural gas and syngas

Regenerative furnace simulation under flameless combustion regime with natural gas and syngas

The Effects of Multiple Swirl Generator Inlets Circumferential Distribution to a Liquid Fuelled Ultra-High Swirl Flameless Combustion Characteristics

Influence of Non-Structural Parameters on Dual Parallel Jet Characteristics of Porous Nozzles

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