# Shaft Kiln Modelling and Simulation.pptx

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### Shaft Kiln Modelling and Simulation.pptx

• 1. Design of Shaft Kiln Presented By: Mohsin Ajmal 201228 Ans Bilal Cheema 201556 Muhammad Irfan Aslam 199056 Presented to: Date: Prof. Dr.-Ing. Eckehard Specht 23.06.2015 Supervisors: M.Sc. G. Sandaka M.Sc. B. Hallak
• 2. Lime Calcination in Shaft Kiln Given parameters: lime production= 200 tons of lime per day Impurities= 5% Diameter of particle= 60mm to 80mm Fuel= lignite gas Internal diameter of kiln= 2.5m Problem statement: 1. Design of the kiln (diameter, length of preheating, reaction and cooling zone). 2. Arrangement of burner for homogeneous fuel distribution in the cross section. 3. Fuel consumption (spec. energy demand). 4. Pressure drop. 5. Amount and concentration of the flue gas.
• 4. Design of the kiln To Calculate the Value of the the Preheating Zone and Cooling zone we use this Equation. The dimensionless temperature for the cooling zone can be calculated by the following relation Where 𝑇𝑠𝐿 =80 C 𝑇𝑠0 =1200 C 𝑇𝑔𝐿 =20 C For pre-heating zone Where 𝑇𝑠𝐿 =910 C 𝑇𝑠0 =20 C 𝑇𝑔0 = 300 C =0.95 =1.46
• 5. where Ṁg = Ṁs = cpg= cp𝑠= ṁg= Ṁg 𝐴 A= area of cross section of the kiln u = overall heat transfer coefficient= O = 6 d d = particle diameter Ψ = porosity = 0.4 =1.62 6.83kg/s 4.11kg/s 1.12kj/s 1.15kg/s =1.4kg/s/m2 80W/m2.K =85.7m‾1 =70mm
• 6. The length of the reaction zone can be calculated through the time of reaction where Resistances: Form Functions for spherical particles: =210 =79 =0.9 =0.55
• 7. Material velocity inside the kiln can be calculated from the throughput of lime ML = ρ . u . A Kc= concentration of carbon dioxide in lime tone = 1190 kg/m3 ∆hr= specific reaction enthalpy = 3820 KJ/kg TA = 1200 C TF= 900 C α = heat transfer coefficient λ = thermal conductivity 𝑟𝑠= radius of sphere b = shape factor X = conversion = 0.49 m/hr
• 8. Length of Zones inside the kiln Cooling zone Reaction zone Pre heating zone 1.3m 2m 1.3m
• 9. Energy Balance Equation for Fuel Consumption E=
• 10. yCO2 = 0.44kgCO2 / kg limestone Tg = 300C Teq = 910 C λ = excess air number = 1.2 L = air demand = 7.3 kgair / kg fuel Qw= heat loss through wall The fuel consumption thus calculated to be 4.5 MJ/kg lime By using this Equations the flow rates of various species can be calculated = 4.5 kg/s = 6.8 kg/s = 4.11 kg/s
• 11. Compositions of Flue Gases lignite C H N L (kgair/kg fuel λ Excess air number 70% 5% 25% 7.3 1.2 Composition of lignite and parameters for stiociometric calculations Flue gas composition 𝐶𝑂2 𝑂2 𝐻2O 54% 10% 36%
• 12. Pressure Drop By Ergun Equation we can calculate the Pressure Drop: Pressure drop in cooling zone= ΔP = 6.86 mbar Pressure drop in reaction zone= ΔP = 792 mbar Pressure drop in preheating zone= ΔP =435 mbar
• 13. Arrangement of burner for homogeneous fuel distribution in the cross section • Increase of penetration depth depends upon the depth of the nozzle inside the kiln • 3-D shape with 45° angel, being divided by 360°, there are 8 nozzles which are averagely distributed around the kiln. • Placement of burner signify the end of the reaction zone and start of cooling zone therefore placement of burners should be done according to calculations of fore mentioned zone lengths
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