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Fluidized Bed

Fluidized Bed. CHE 381 Group 5 3/30/2011 Alex Guerrero Andrew Duffy Bernard Hsu Daniyal Qamar Jeff Tyska Ryan Kosak Tomi Damo. Source: EPA. Introduction. Purpose Measure the pressure drop through a fluidized bed column Observe the affects of fluid velocity on the bed

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Fluidized Bed

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  1. Fluidized Bed CHE 381 Group 5 3/30/2011 Alex Guerrero Andrew Duffy Bernard Hsu DaniyalQamar Jeff Tyska Ryan Kosak TomiDamo Source: EPA

  2. 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

  3. Theory • Necessary Equations • Bed Void Fraction • Fluid Velocity • Settling Velocity • Ergun Equation

  4. Operation Assumptions Relatively well separated particles Constant Bed Temperature Measurements are taken at Steady State conditions

  5. Apparatus • Tops to fluidized beds • Fluidized bed columns • Ceramic spheres • Rotameter • Pressure gauge • Valve • Valve • Pressure gauge • Rotameter • Valve • Pipette bulbs • U-Tube manometer • Half turn valves • Heater • Thermocouple

  6. Materials and Supplies Air Sand Silica Sieve Trays Graduated Cylinders Shop Vacuum

  7. Procedure Stack sieve trays accordingly to separate out sand Determine sand and silica sample densities using graduated cylinder Load respective column with sand ( 6-10 inches) Turn on air supply and slowly open and increase air flow while taking recordings. Increments of 10 % of max flow Record air flow rate, pressure drop, height of bed and any related observations Repeat with second sand sample and repeat Clean sand column Load and heat up silica column Repeat 3 -6 for silica column

  8. 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

  9. 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

  10. 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.

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