Abstract
Based on the analysis of heat transfer mechanics, physical and chemical change of pellet drying and preheating process in grate, the mathematical model is established and solved by three-diagonal matrix algorithm. With Visual Basic 6.0 a simulation software is developed. The model is verified by measurements at a domestic pellet plant, and the temperature distribution of pellet bed is gained. Meanwhile, the influence of different operation parameters on the pellet thermal process is studied. The results can be taken as a basis of practical production control and the grate optimizing design.
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Abbreviations
- cs, cg:
-
Specific heat capacity of pellet and gas, J/(kg·K)
- h :
-
Convection heat transfer coefficient, W/(m2 · K)
- Δh r :
-
Enthalpy of reaction of oxidation, J/kg
- Δh w :
-
Latent heat of vaporization, J/kg
- R r :
-
Rate of magnetite reaction, kg/(m3 · s)
- R w :
-
Water evaporation rate, kg/(m3 · s)
- Ts, Tg:
-
Thermodynamic temperature of pellet and gas, K
- u g :
-
Velocity of gas, m/s
- α :
-
Surface area of pellets per stere, m2/m3
- ɛ b :
-
Porosity of pellet bed, %
- λ g :
-
Thermal conductivity of gas, W/(m · K)
- λ s :
-
Thermal conductivity of pellet, W/(m · K)
- ρs, ρg:
-
Mass density of pellet and gas, kg/m3
- τ :
-
Time, s
- φ :
-
Sharing coefficient of reaction heat in solid phase
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Foundation item: the National High Technology Research and Development Program (863) of China (No. 2007AA05Z215)
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Feng, Jx., Liang, Kl., Zhang, C. et al. Development and application of thermal mathematical model of iron ore pellet bed in grate. J. Shanghai Jiaotong Univ. (Sci.) 16, 312–315 (2011). https://doi.org/10.1007/s12204-011-1150-3
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DOI: https://doi.org/10.1007/s12204-011-1150-3