Chemical Engineering :: Mechanical Operations
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With increase in the capacity of screens, the screen effectiveness
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As particle size is reduced
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Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the
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Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.
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For efficient grinding, ball mills must be operated
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In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.
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For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)
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The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).
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Pick out the wrong statement pertaining to the turbine agitator.
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A.
Recommended peripheral speed for the turbine agitator is 200-250 metres/minute.
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B.
Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow.
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C.
Generally, the diameter of the agitator is kept between l/3rd to l/6th of the tank diameter while the blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator diameter).
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D.
Turbine agitator should be located at a height not less than one agitator diameter length from the bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two agitators should be used.
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