Process Equipment & Plant Design Mcqs for Chemical

Q.  In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier crosssection H = hold up of solid.) ?

a. Z.H.ρ/L
b. L/Z.H.ρ
c. H.ρ/L
d. Z.H/ρL


ANSWER: See Answer
 
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