Ammonium nitrate, at 70oF with a moisture content of 15 wt% (dry basis), is fed into a direct-heat rotary dryer at a feed rate of 700 lb/ minute (dry basis). Air at 250oF and 1 atm, with a humidity of 0.02 lb H2O/lb dry air, enters the dryer and passes cocurrently with the solid. The final solid moisture content is to be 1 wt% (dry basis) and all drying will take place in the constant-rate period. Make a preliminary estimate of the dryer diameter and length, assuming that such dryers are available in: (1) diameters from 1 to 5 ft in increments of 0.5 ft and from 5 to 20 ft in increments of 1.0 ft, and (2) lengths from 5 to 150 ft in increments of 5 ft.
Ammonium nitrate, at 70oF with a moisture content of 15 wt% (dry basis), is fed into a direct-heat rotary dryer at a feed rate of 700 lb/ minute (dry basis). Air at 250oF and 1 atm, with a humidity of 0.02 lb H2O/lb dry air, enters the dryer and passes cocurrently with the solid. The final solid moisture content is to be 1 wt% (dry basis) and all drying will take place in the constant-rate period. Make a preliminary estimate of the dryer diameter and length, assuming that such dryers are available in: (1) diameters from 1 to 5 ft in increments of 0.5 ft and from 5 to 20 ft in increments of 1.0 ft, and (2) lengths from 5 to 150 ft in increments of 5 ft.
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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Ammonium nitrate, at 70oF with a moisture content of 15 wt% (dry basis), is fed into a direct-heat rotary dryer at a feed rate of 700 lb/ minute (dry basis). Air at 250oF and 1 atm, with a humidity of 0.02 lb H2O/lb dry air, enters the dryer and passes cocurrently with the solid. The final solid moisture content is to be 1 wt% (dry basis) and all drying will take place in the constant-rate period. Make a preliminary estimate of the dryer diameter and length, assuming that such dryers are available in: (1) diameters from 1 to 5 ft in increments of 0.5 ft and from 5 to 20 ft in increments of 1.0 ft, and (2) lengths from 5 to 150 ft in increments of 5 ft.
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