Development of non-premixed porous inserted regenerative thermal oxidizer

Jun-chun, Zhang; Cheng, Leming; Zheng, Chenghang; Luo, Zhongyang; Ni, Mingjiang

doi:10.1631/jzus.a1300198

Cited by 6 publications

(5 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results showed that the diffusion combustion in porous media exhibits high stability [16–19]. Zhang et al .…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

“…The results showed that the diffusion combustion in porous media exhibits high stability [16][17][18][19]. Zhang et al [16] developed a 125 kW reciprocating flow porous medium diffusion combustion furnace. The results showed that, compared with the conventional gas burner without regenerator, the fuel/air can be burned stably with fuel saving of 35%.…”

mentioning

confidence: 99%

See 2 more Smart Citations

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.

View full text Add to dashboard Cite

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.

show abstract

“…The results showed that the diffusion combustion in porous media exhibits high stability [16–19]. Zhang et al .…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

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.

View full text Add to dashboard Cite

show abstract

“…Reduced chemical mechanisms are used for the present simulation and two-step methane-air reaction is used as in equations. (11) and (12).…”

Section: B Chemical Kinetics Of Methane Combustionmentioning

confidence: 99%

“…Zhang et al [11] utilized DFC for a porous inserted regenerative thermal oxidizer system in an industrial coppermelting furnace. Using a one-temperature model it was found that the system achieved a significant reduction in the NOx emission level and a fuel saving of approximately 30% compared to a typical regenerative thermal oxidizer.…”

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

View full text Add to dashboard Cite

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.

show abstract

Numerical Investigation of Effect of Porosity and Fuel Inlet Velocity on Diffusion Filtration Combustion

2021

View full text Add to dashboard Cite

Development of non-premixed porous inserted regenerative thermal oxidizer

Cited by 6 publications

References 18 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

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

Numerical Investigation of Effect of Porosity and Fuel Inlet Velocity on Diffusion Filtration Combustion

Contact Info

Product

Resources

About

Development of non-premixed porous inserted regenerative thermal oxidizer

Cited by 6 publications

References 18 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

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

Numerical Investigation of Effect of Porosity and Fuel Inlet Velocity on Diffusion Filtration Combustion

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