Numerical Modeling of a Rotary Kiln Incinerator

Khan, Jawad; Pal, Dulal; Morse, John S.

doi:10.1089/hwm.1993.10.81

Cited by 14 publications

(9 citation statements)

References 6 publications

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“…A sump at the kiln discharge was included in the modeling study by Leger (4) but was not included by Khan or Jakway (5,6). The maximum bed temperature was observed near the middle of the kiln in both the field study and in all computational cases that included the sump geometry and the sump inlet flow.…”

Section: Results Of Numerical Experimentsmentioning

confidence: 99%

Numerical Modeling of the Temperature Distribution in a Commercial Hazardous Waste Slagging Rotary Kiln

Veranth

Silcox

Pershing

1997

Environ. Sci. Technol.

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The gas, wall, and bed temperatures in a hazardous waste incineration kiln were studied using a commercially available, CFD-based, reacting flow code, which included radiation heat transfer. The model was compared to field measurements made on a co-current flow, 35 MW slagging rotary kiln. Cases were run to determine the sensitivity of the predictions to changes in the model assumptions and to simulate the normal variation in combustion inputs. The model predictions of the peak bed temperature, of the axial temperature profile, and of the gas temperature at the exit-plane were consistent with the measurements at a fullscale waste incinerator during normal operation. The model and the field observations both indicate that the peak bed temperature occurs near the middle of the kiln and that the difference between the peak bed temperature and the exit-plane gas temperature depends on the inlet flows. The geometry of the transition between the kiln and the secondary combustion chamber and the fuel-to-air equivalence ratio have the greatest effect on the calculated temperature distribution. Modeling studies provide useful information such as the relationship between available measurements and the temperature at inaccessible locations inside a full-scale kiln.

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Section: Results Of Numerical Experimentsmentioning

confidence: 99%

Numerical Modeling of the Temperature Distribution in a Commercial Hazardous Waste Slagging Rotary Kiln

Veranth

Silcox

Pershing

1997

Environ. Sci. Technol.

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“…Their results show that temperature field in the combustion chamber is vertically stratified and increased along flow direction. Numerical results [14,15] also show that there is a recirculation region near the kiln exit. The recirculation is due to the flow of higher velocity gases near the top of the kiln and high velocity leak air near the bottom of the kiln.…”

Section: Introductionmentioning

confidence: 90%

“…Recently, Cundy et al [14], Khan et al. [15] and Chen el al. [16] performed three-dimensional numerical studies on rotary kiln incinerators.…”

Section: Introductionmentioning

confidence: 99%

Visualization Studies of Three Dimensional Flow and Solid Motion in a Rotary Kiln

Chen¹,

Lee²

1995

Hazardous Waste and Hazardous Materials

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Results of flow visualization studies in a transparent cylindrical chamber are presented to advance the knowledge of three-dimensional flow structure and mixing behavior in rotary kiln incinerators. Reynolds number based on inlet air velocity and diameter of inlet port ranges from 1,700 to 13,700 and covers the laminar, transitional, and turbulent flow regimes. Results show that there are recirculation zones near the inlet corners due to sudden expansion of the chamber. A potential-like core exists in the central and entrance region of the chamber and separates viscous layers near side walls. When Reynolds number exceeds certain critical value, flow instability in the form of large eddies would be generated. These large eddies would break up to smaller eddies in the downstream, and flow becomes turbulent at higher Reynolds number. Small-scale eddies and turbulent motion appear more vigorous when chamber is partly loaded with a bed of solid materials. Effects of size and shape on the movement of single solid material in the rotary kiln are also examined.

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“…Threedimensional numerical models have been used by Leger et al (1993) and Khan et al (1993) to examine the fluid mechanics in incinerators. In this work, we will only consider the particle entrainment due to flow over a surface.…”

Section: Transfer To the Gas Phasementioning

confidence: 99%

Metallic Particle Formation and Growth Dynamics During Incineration

Lin¹,

Biswas²

1994

Combustion Science and Technology

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A comprehensive model 10 predict the lead aerosol size distribution for typical incinerator operating conditions has been developed. Using the feed rate and incinerator operating conditions, the metal transfer rate to the gas phase is determined using a mass transfer calculation. A detailed, multicomponent aerosol dynamic model is developed accounting for the chemical kinetics and applied to a lead-oxygenchlorine system. Reasonable agreement is obtained between model predictions and experimental data from controlled studies for different aspects of the model. The effect of chlorine on the resulting aerosol size distribution has been determined. The role of the transfer rates of lead to the gas phase on the resulting size distributions have also been determined. Simulations have been performed for typical conditions encountered in a waste incinerator.

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Numerical Modeling of a Rotary Kiln Incinerator

Cited by 14 publications

References 6 publications

Numerical Modeling of the Temperature Distribution in a Commercial Hazardous Waste Slagging Rotary Kiln

Numerical Modeling of the Temperature Distribution in a Commercial Hazardous Waste Slagging Rotary Kiln

Visualization Studies of Three Dimensional Flow and Solid Motion in a Rotary Kiln

Metallic Particle Formation and Growth Dynamics During Incineration

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