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Production of Steel Shot Josh Ball – jbball@mtu.edu Matt Calcutt – mtcalcut@mtu.edu Sean Loney – smloney@mtu.edu

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Introduction Background Process Overview Calculations Conclusions

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Background What is Steel Shot? – Tiny steel balls What is it used for? – Cleaning work pieces (Shot Blasting) Sand and Scale removal from castings, Surface prep for painting – Shot Peening – Granite Cutting – Non-Toxic Shotgun ammunition

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Process Overview Molten Steel flows from a tundish and is made into a spray. The droplets (1mm diameter spheres) freefall in a cylindrical chamber containing a gas atmosphere. Upon reaching 1000C, they will land in a fluidized bed for further cooling.

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Objective Determine what gas (He,Ne, Ar, Kr) in the vessel will result in the fastest solidification time, and therefore the shortest vessel. Determine the relationship between air velocity and cooling time in the fluidized bed.

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Assumptions The steel shot will not deform on impact The conveyor movement will not impact the rate of cooling Density and size of particles does not change with temperature 1 Million pounds of shot would be produced in a 24 hour period

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Calculating terminal velocity of the droplets for each atmosphere

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Finding the heat transfer coefficient for each process

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Calculating Biot Numbers

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Calculating Cooling Time and Chamber Height

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Void Area fraction

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Bed Thickness

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Velocity of Air

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Cooling in Fluidized Beds

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Cooling in Fluidized Beds continued

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Conclusion Helium gives the smallest chamber height (13.63m) At 0.5m wide the cooling bed is 34mm thick The length of the cooling bed depends upon the velocity (0.56m to 1.5m)

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Sources Dr. Hackneys wonderful class notes http://encyclopedia.airliquide.com/encyclope dia.asp http://chem.lapeer.org/PhysicsDocs/Goals200 0/Laser1.html

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