Numerical Investigation of a Portable Incinerator: A Parametric Study
Abstract
:1. Introduction
2. Geometry Creation
3. Waste Properties
4. Governing Equations
5. Results and Discussion
5.1. Effects of Cooling Air
5.2. Effects of Primary Burner Position
5.3. Effects of Rubbish Height
5.4. Comparison of All Cases by Oxygen Concentration
6. Conclusions
- By introducing the higher mass flow rate of the cooling air, the hot spots inside the combustion chamber reduced, and an even temperature distribution has been achieved.
- By introducing the higher mass flow rate of the cooling air, not only the air velocities inside the combustion chambers have been improved, but also the negative pressure, which helps the evacuation of hazardous gases, decreased drastically.
- By increasing the rubbish volume, the incinerator is still able to burn the waste but this burning would face some limitations, which could affect the fluid dynamics parameters of the incinerator.
- According to the investigations, the optimum place of the primary burner at the ceiling of the primary chamber is found to be 1500 mm from the main air inlet.
- By increasing the burner distance from the main air inlet, all thermo-chemical parameters of the incinerator are affected.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Nomenclature
Notations | ||
Particle surface area | [] | |
Specific heat capacity of particle | [] | |
Volumetric heat sources | [] | |
Total internal energy | [] | |
Inverse of relaxation time | [] | |
Other forces per unit mass of particle | [] | |
Other forces per unit volume of gas | [] | |
g | Gravity | [] |
Convective coefficient | [] | |
Favre-Averaged enthalpy | [] | |
Diffusive flux of species | [] | |
Thermal conductivity | [] | |
Mass of particle | [] | |
Pressure | [] | |
Reynolds-Averaged pressure | [] | |
Prandtl number | [] | |
Net production rate of species | [] | |
Additional created source rate of species | [] | |
Other volumetric heat sources | [] | |
Temperature of gas mixture | [°C] | |
Temperature of particle | [°C] | |
Temperature far from surface of particle | [°C] | |
Gas mixture velocity | [] | |
Favre-Averaged gas mixture velocity | [] | |
Fluid flow velocity | [] | |
Gas mixture velocity fluctuations | [] | |
Particle velocity | [] | |
Local mass fraction of each species | [] | |
Favre-Averaged mass fraction of species | [] | |
Greek symbols | ||
Particle emissivity | [] | |
Dynamic gas viscosity | ||
Reynolds-Averaged density of species | ||
Density of species i | ||
Density of gas mixture | ||
Density of particle | ||
Stefan-Boltzmann constant | [] | |
Viscous diffusion tensor | [] | |
Net production rate of species | [] | |
Subscripts | ||
f | Gas | |
p | Particle | |
Abbreviations | ||
CFD | Computational fluid dynamics | |
NG | Natural Gas | |
DO | Discrete ordinate | |
LHV | Lower heating value | |
MSW | Municipal solid waste |
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Solid Materials | MJ/kg |
Car tire | 37 |
Food waste | 4.2 |
Glass fiber-reinforced polyester (GRP) | 15 |
Leather | 18.9 |
Newspaper | 18.6 |
Paraffin wax | 42 |
Sawdust | 19 |
Plastics | MJ/kg |
Acrylonitrile butadiene styrene (ABS) | 39 |
Cellulose | 16 |
Nylon, polyamide (PA) | 28 |
Polyester (PET), textiles, bottles | 23 |
Polyethylene (PE) | 46 |
Polypropylene (PP) | 43 |
Polystyrene (PS) | 46 |
Polyurethane (PU) | 36 |
Polyvinyl chloride (PVC) | 18.9 |
Liquid | MJ/kg |
Acetic acid | 15.8 |
Acetone | 22.4 |
Kerosene/Paraffin | 34.8 |
White spirit | 34.8 |
Equations Name | Material Phase | Governing Equations |
---|---|---|
Continuity (Mass balance) | Solid | Devolatilization and char burnout |
Fluid | (EDC model) | |
Momentum | Solid | |
Fluid | ||
Energy | Solid | |
Fluid |
Equations Name | Material Phase | Governing Equations |
---|---|---|
Continuity (Mass balance) | Gas Mixture | |
Momentum | Ash Solid | |
Gas Mixture | ||
Energy | Gas Mixture |
Location | Type | Value |
---|---|---|
A | Pressure gauge | P = 0 kPa |
B | Burner | mass flow rate of air = 8 (kg/s) mass flow rate of fuel = 5 (kg/s) |
C | Air inlet | V = 1.75 (m/s) |
D | Air inlet | V = 1.5 (m/s) This value for all air inlets is the same. |
E | Burner | mass flow rat of air = 6 (kg/s) mass flow rate of fuel = 3 (kg/s) |
F | Air inlet | V = 3 (m/s) |
Case Numbers | Rubbish Height | Burner Position | Mass Flow Rate |
---|---|---|---|
Case 1 | 800 mm | 1500 mm | 0.07 kg/s |
Case 2 | 800 mm | 1500 mm | 0.14 kg/s |
Case 3 | 800 mm | 1500 mm | 0.21 kg/s |
Case Numbers | Rubbish Height | Burner Position | Mass Flow Rate |
---|---|---|---|
Case 4 | 800 mm | 1000 mm | 0.07 kg/s |
Case 1 | 800 mm | 1500 mm | 0.07 kg/s |
Case 5 | 800 mm | 2000 mm | 0.07 kg/s |
Case Numbers | Rubbish Height | Burner Position | Mass Flow Rate |
---|---|---|---|
Case 6 | 700 mm | 1500 mm | 0.07 kg/s |
Case 1 | 800 mm | 1500 mm | 0.07 kg/s |
Case 7 | 900 mm | 1500 mm | 0.07 kg/s |
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Saffari Pour, M.; Hakkaki-Fard, A.; Firoozabadi, B. Numerical Investigation of a Portable Incinerator: A Parametric Study. Processes 2020, 8, 923. https://doi.org/10.3390/pr8080923
Saffari Pour M, Hakkaki-Fard A, Firoozabadi B. Numerical Investigation of a Portable Incinerator: A Parametric Study. Processes. 2020; 8(8):923. https://doi.org/10.3390/pr8080923
Chicago/Turabian StyleSaffari Pour, Mohsen, Ali Hakkaki-Fard, and Bahar Firoozabadi. 2020. "Numerical Investigation of a Portable Incinerator: A Parametric Study" Processes 8, no. 8: 923. https://doi.org/10.3390/pr8080923