Answered: Fluidization of a Sand Bed Filter. To…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Question

Fluidization of a Sand Bed Filter. To clean a sand bed filter it is fluidized at
minimum conditions using water at 24"C. The round sand particles have a
density of 2550 kglm3 and an average size of 0.40 mm. The sand has the
properties given in Table 3.1-2.
(a) The bed diameter is 0.40 m and the desired height of the bed at these
minimum fluidizing conditions is 1.75 m. Calculate the amount of solids
needed.
(b) Calculate the pressure drop at these conditions and the minimum velocity for
fluidization.
(c) Using 4.0 times the minimum velocity, estimate the porosity and height of the
expanded bed.

Void Fraction, ɛmf, at Minimum Fluidization
Conditions (L2)
ТАBLE 3.1-2.
Particle Size, Dp (mm)
Туре of Рarticles
0.06
0.10
0.20
0.40
Void fraction, ɛEms
0.60
0.58
Sharp sand (os = 0.67)
Round sand (Øs = 0.86)
Anthracite coal (os = 0.63) 0.61
0.53
0.49
(0.42)
0.52
0.53
0.48
0.43
0.60
0.56

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