Experimental and numerical investigations on diffusion filtration combustion in a plane-parallel packed bed with different packed bed heights

Shi, Junrui; Li, Ben-Wen; Linan,; Xia, Yongfang; Xu, Yang; Liu, Hongsheng

doi:10.1016/j.applthermaleng.2017.07.207

Cited by 20 publications

(5 citation statements)

References 19 publications

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“…The formation rate of NOx is significant only at high temperatures corresponding to high required activation energy of reaction in (13). Due to the existence of the 'O' radical in turbulent diffusion flames [15] its concentration is determined by partial equilibrium approximation.…”

Section: B Chemical Kinetics Of Methane Combustionmentioning

confidence: 99%

“…Shi et al [13] studied DFC characteristics, based on twodimensional numerical investigations on a plate-parallel diffusion filtration combustor with different packed bed heights. Their results showed a significant temperature decrease with a bed height increase from 40 mm to 80 mm, as well as, the existence of two types of flame, immersed and surface, with two luminous zones between 40mm ≤ h ≤ 160 mm.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Multilayer Porous Media on the Efficiency of Filtration Combustion

Lavrent'ev¹,

Tarokh²

2020

Progress in Canadian Mechanical Engineering. Volume 3

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Diffusion filtration combustion in a radiative jet burner is numerically investigated. This study focuses on the effects of the porous media structure on the efficiency of nonpremixed combustion, namely combustion temperature and NOx emissions. For this investigation, methane-air combustion within a two-layer porous media is considered. Twodimensional axisymmetric model is chosen to reduce the number of elements and the corresponding computational resource requirements. Fluid turbulence is resolved using the kω SST turbulence model, while the turbulence-controlled reaction rates are computed using the eddy dissipation model. Stoichiometric, two-step methane-air reaction is utilized in the reaction zone. In the present model both thermal and prompt NOx formation mechanisms are considered, where an extended Zeldovich mechanism is used for thermal NOx formation. For high combustion temperatures where radiative heat flux is larger than that of convection and conduction heat transfer rates, radiation becomes the dominant heat transfer mode. To account for the emission and scattering of thermal radiation by the porous media, the Discrete Ordinate model is considered. The relationship between velocity and pressure corrections is calculated using the SIMPLE algorithm. The layered porous zone arrangement is utilized to increase combustion performance due to enhanced fuel-air mixing through increased heat recirculation within the multilayer porous media. Utilizing two layers of equal height, ɛ=0.6 and 0.45, upstream and downstream, respectively increased combustion temperature while decreasing combustion zone and NOx emission. Additionally, the effects of the thickness of each layer on combustion efficiency are studied. Increasing the height of the low porosity downstream region, which effectively decreases the height of the upstream high porosity region, resulted in increased NOx emissions due to higher temperature in the combustion zone.

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Section: B Chemical Kinetics Of Methane Combustionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effects of Multilayer Porous Media on the Efficiency of Filtration Combustion

Lavrent'ev¹,

Tarokh²

2020

Progress in Canadian Mechanical Engineering. Volume 3

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“…Zhu Rongjun et al [11] found through numerical simulation that the flame temperature distribution of metal fiber surface combustion mode containing porous medium was more uniform and the local reaction heat release rate was lower. Shi Jungrui et al [12] invented a cylindrical radiant porous medium heater with diffusion combustion in the cavity. By taking advantage of the good radiative heat transfer performance of the porous medium, the heat transfer is more uniform, and the fuel with low concentration and low calorific value can be burned, which is more widely used.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of ethylene combustion characteristics under a new double-layer porous media burner

Zhang

et al. 2023

E3S Web Conf.

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The efficient use of energy is an important strategic issue concerning our energy security and double carbon goals. Many industrial waste gases, such as oil refineries, contain a lot of ethylene, which is a gas that is harmful to people and the environment. The use of high-efficiency burners to reduce ethylene emissions is a proven and convenient way, so the improvement and optimization of high-efficiency burners has become a hot research issue nowadays. In this paper, a new porous media burner is designed, and a numerical model of the structure is established based on finite element software. The porous media burner is used to treat low calorific value ethylene and effectively reduce the direct emission of low calorific value ethylene in wastewater treatment and chemical industries. Based on the model, the combustion characteristics and pollutant emission characteristics of premixed gas at different equivalence ratios and different flow rates were investigated. The results show that the maximum combustion temperature can reach 1757K with a constant inlet flow rate of premixed gas and a full combustion at an equivalent ratio of 0.85; the maximum temperature increases rapidly with the increase of flow rate at an inlet flow rate of 0.65-0.85 m/s with a constant equivalent ratio, and the temperature rise effect increases slowly when the flow rate is higher than 0.85 m/s; the new porous media The maximum reduction of pollutant emissions of the new porous media burner reaches 37.9%. This study has a guiding effect on the design and engineering application of porous media combustion devices.

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“…Shi et al . [ 16 ] recently reported that two types of flame, the surface flame above the pellets and the immersed flame within the packed bed, coexist in a plane-parallel pellet-packed bed with different bed lengths.…”

Section: Introductionmentioning

confidence: 99%

“…They found that the application of porous media can significantly expand the flammable range compared to the conventional one. Shi et al [16] recently reported that two types of flame, the surface flame above the pellets and the immersed flame within the packed bed, coexist in a plane-parallel pellet-packed bed with different bed lengths.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths

Shi

Liu

et al. 2018

R. Soc. open sci.

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In experimental investigations on axial symmetry, over-ventilated CH4/air diffusion combustion in a packed bed is executed to study the height, shape and stability of the flame. The combustor is a quartz tube packed with alumina pellets in which a cylindrical fuel stream is surrounded by a coflow air nozzle. The results show that the bed length and pellet diameter have a significant influence on the flame properties. In general, the flame above the pellet surface has axial symmetry, and its shape and colour are similar to those of a conventional diffusion flame when the bed length is smaller. The colour of the flame front varies with the bed length. The changed colour indicates an increased flame front temperature and that the combustion regime above the bed surface may change from non-premixed combustion to partially premixed combustion or even premixed combustion owing to the mix and dispersion effect in the packed bed. In addition, multiple flame behaviours, such as an inclined flame front, isolated reaction zone and oscillatory motion followed by a pulsating sound with a few hertz in a packed bed, are observed experimentally. The possible reasons for these phenomena are discussed.

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Experimental and numerical investigations on diffusion filtration combustion in a plane-parallel packed bed with different packed bed heights

Cited by 20 publications

References 19 publications

The Effects of Multilayer Porous Media on the Efficiency of Filtration Combustion

The Effects of Multilayer Porous Media on the Efficiency of Filtration Combustion

Numerical simulation of ethylene combustion characteristics under a new double-layer porous media burner

An experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths

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