CHE 381 Group 5 3/30/2011 Alex Guerrero Andrew Duffy Bernard Hsu Daniyal Qamar Jeff Tyska Ryan Kosak...
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Transcript of CHE 381 Group 5 3/30/2011 Alex Guerrero Andrew Duffy Bernard Hsu Daniyal Qamar Jeff Tyska Ryan Kosak...
Fluidized BedCHE 381 Group 5
3/30/2011
Alex Guerrero
Andrew Duffy
Bernard Hsu
Daniyal Qamar
Jeff Tyska
Ryan Kosak
Tomi DamoSource: EPA
Introduction Purpose
• Measure the pressure drop through a fluidized bed column
• Observe the affects of fluid velocity on the bed• Observe the affects of the temperature on the
bed• Determine the point of minimum fluidized velocity
Technical• Pressure drop is measured for varying air flow
rates, particle sizes and bed temperatures • Calculated value is the superficial velocity
Theory Necessary Equations
• Bed Void Fraction
Fluid Velocity
Settling Velocity
Ergun Equation
Operation Assumptions Relatively well separated particles
Constant Bed Temperature
Measurements are taken at Steady State conditions
Apparatus1. Tops to fluidized beds2. Fluidized bed columns3. Ceramic spheres4. Rotameter5. Pressure gauge6. Valve7. Valve8. Pressure gauge9. Rotameter10. Valve11. Pipette bulbs12. U-Tube manometer13. Half turn valves14. Heater15. Thermocouple
Materials and Supplies Air Sand Silica Sieve Trays Graduated
Cylinders Shop Vacuum
Procedure1. Stack sieve trays accordingly to separate out sand
2. Determine sand and silica sample densities using graduated cylinder
3. Load respective column with sand ( 6-10 inches)
4. Turn on air supply and slowly open and increase air flow while taking recordings. Increments of 10 % of max flow
5. Record air flow rate, pressure drop, height of bed and any related observations
6. Repeat with second sand sample and repeat
7. Clean sand column
8. Load and heat up silica column
9. Repeat 3 -6 for silica column
Experimental Challenges Keeping the air flow steady using the
valve at the bottom of column
Keeping the silica at a constant temperature
Filtering out size categorizes of sand particles
Safety Sand could come out the top of the
column and get into eyes
Keep hands clear of heat supply and heated materials
Use vacuum responsibly preventing unintended suction of personal items
Sand can get slippery when on the floor
Report References Bird, R. Byron, Warren E. Stewart, and Edwin N.
Lightfoot. Transport Phenomena. New York: J. Wiley, 2007. Print.
"Fluidized Beds." University of Illinois at Chicago - UIC. Web. 25 Jan. 2010. <http://www.uic.edu/depts/chme/UnitOps/che381-2005f-frame.html>.
Sinnott, Ray, and Gavin Towler. Chemical Engineering
Design. Amsterdam: Elsevier, 2009. Print. W.E. McCabe, J.C. Smith, and P. Harriott 2001. Unit
Operations of Chemical Engineering, McGraw Hill, New York.