Numerical study of diffusion filtration combustion characteristics in a plane-parallel packed bed

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

doi:10.1016/j.fuel.2015.05.055

Cited by 21 publications

(8 citation statements)

References 40 publications

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“…The gas flow in the packed bed is assumed to be laminar and gas radiation is computed by discrete model [22]. The porosity in the packed bed is uniform and set to be 0.39.The diffusion of chemical species and heat in the vertical and horizontal directions is assumed to be uniform.Based on the above assumptions, a set of differential equations can be obtained [14], as presented in the following.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Shi et al . [14] studied the diffusion combustion characteristics in a pellet packed bed using a two-dimensional two-temperature model. The results showed that the high-temperature zone of gas and solid phases exists in different positions of burner, but the thermal non-equilibrium between gas and solid phases outside the high-temperature zone was very small.…”

Section: Introductionmentioning

confidence: 99%

“…Studies by Shi et al . [14,15] and others show that the flame height was mainly controlled by the fuel diffusion rate.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical studies on combustion characteristics of N ₂ -diluted CH ₄ and O ₂ diffusion combustion in a packed bed

Shi

Mao

et al. 2019

R. Soc. open sci.

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Experimental and numerical studies were conducted to determine the combustion characteristics of gas diffusion combustion in a porous combustor packed with 2.5 mm or 3.5 mm alumina pellets, special attention being focused on the effect of packed bed height ( h ) on combustion, NO and CO emissions. The pollutant emission of diffusion filtration combustion is studied with different packed bed lengths in the range of 40 mm ≤ h ≤ 240 mm, fixed excess air ratio of 1.88 and fixed gas inlet velocity of 0.06 m s −1 . Results show that both immersed and surface flames coexist in the combustor. Although porous media enhance the mixing and diffusion processes, the diffusion flame shape is still observed from the side and top views of the combustor, and the diffusion filtration retains properties of diffusion combustion. The immersed flame is always observed with increase in h , whereas the height of surface flame decreases. The NO emission decreases sharply when h is increased from 40 mm to 120 mm. However, the NO emission decreases slightly when h > 120 mm. In the investigated range of h , it is shown that h has a significant influence on the CO emission, an increase in h leading to a constant increase in CO for the combustors packed with 2.5 mm or 3.5 mm pellets. The maximum CO emission is 662 ppm and the minimum value is 67 ppm. In the scope of this study, the temperature on the external wall of the combustor reaches 434–513°C.

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Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical studies on combustion characteristics of N ₂ -diluted CH ₄ and O ₂ diffusion combustion in a packed bed

Shi

Mao

et al. 2019

R. Soc. open sci.

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“…Shi et al . [ 14 ] conducted numerical simulations of diffusion combustion in a plane-parallel packed bed, and their predictions showed that diffusion combustion in a packed bed remains the essential characteristic of an open-space diffusion flame. Ning et al .…”

Section: Introductionmentioning

confidence: 99%

“…The simulation of non-premixed filtration combustion predicted the high stability of the flame at a low equivalence ratio. Shi et al [14] conducted numerical simulations of diffusion combustion in a planeparallel packed bed, and their predictions showed that diffusion combustion in a packed bed remains the essential characteristic of an open-space diffusion flame. Ning et al [15] experimentally investigated methane/air diffusion combustion in a Y-shaped meso-scale porous media combustor with three different diameters.…”

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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Combustion characteristics of a low calorific gas burner with ceramic foam enclosed by alumina pellets

Dai

Zhu

et al. 2021

Heat Mass Transfer

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Numerical study of diffusion filtration combustion characteristics in a plane-parallel packed bed

Cited by 21 publications

References 40 publications

Experimental and numerical studies on combustion characteristics of N ₂ -diluted CH ₄ and O ₂ diffusion combustion in a packed bed

Experimental and numerical studies on combustion characteristics of N ₂ -diluted CH ₄ and O ₂ diffusion combustion in a packed bed

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

Combustion characteristics of a low calorific gas burner with ceramic foam enclosed by alumina pellets

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Numerical study of diffusion filtration combustion characteristics in a plane-parallel packed bed

Cited by 21 publications

References 40 publications

Experimental and numerical studies on combustion characteristics of N 2 -diluted CH 4 and O 2 diffusion combustion in a packed bed

Experimental and numerical studies on combustion characteristics of N 2 -diluted CH 4 and O 2 diffusion combustion in a packed bed

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

Combustion characteristics of a low calorific gas burner with ceramic foam enclosed by alumina pellets

Contact Info

Product

Resources

About

Experimental and numerical studies on combustion characteristics of N ₂ -diluted CH ₄ and O ₂ diffusion combustion in a packed bed

Experimental and numerical studies on combustion characteristics of N ₂ -diluted CH ₄ and O ₂ diffusion combustion in a packed bed