(a.) A power of 5 kW is supplied to a machine crushing material at the rate of 0.5 kg/s from 12.5 mm cubes to a product having the following sizes: 60 per cent 3.175 mm, 20 per cent 2.5 mm and 20 per cent 2.25 mm. What power should be supplied to this machine to crush 0.3 kg/s of the same material from 8.5 mm cube to 3.0 mm cube? (assume Bond's law applies) (b.) If crushing rolls 1.5 m diameter are set so that the crushing surfaces are 15 mm apart and the angle of nip is 27°, what is the maximum size of particle which should be fed to the rolls?
(a.) A power of 5 kW is supplied to a machine crushing material at the rate of 0.5 kg/s from 12.5 mm cubes to a product having the following sizes: 60 per cent 3.175 mm, 20 per cent 2.5 mm and 20 per cent 2.25 mm. What power should be supplied to this machine to crush 0.3 kg/s of the same material from 8.5 mm cube to 3.0 mm cube? (assume Bond's law applies) (b.) If crushing rolls 1.5 m diameter are set so that the crushing surfaces are 15 mm apart and the angle of nip is 27°, what is the maximum size of particle which should be fed to the rolls?
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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Transcribed Image Text:QUESTION #1
(a.) A power of 5 kW is supplied to a machine crushing material at the rate of 0.5 kg/s from
12.5 mm cubes to a product having the following sizes: 60 per cent 3.175 mm, 20 per
cent 2.5 mm and 20 per cent 2.25 mm. What power should be supplied to this machine to
crush 0.3 kg/s of the same material from 8.5 mm cube to 3.0 mm cube? (assume Bond's
law applies)
(b.) If crushing rolls 1.5 m diameter are set so that the crushing surfaces are 15 mm apart and
the angle of nip is 27°, what is the maximum size of particle which should be fed to the
rolls?
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