Homework Help is Here – Start Your Trial Now!
Engineering
Chemical Engineering
(a)The hot air stream has an absolute humidity of 0.058 kg moisture/kg dry air and leaves with 0.087 kg moisture/kg dry air, calculate the mass of water in the exiting air per kilogram of wet coal fed. (b)Can the dryer reduce the wet coal moisture to 15%? If the answer is no, suggest the minimum ratio of air to wet coal for the process to be successful. (c) Automate this calculation using Microsoft Excel. The input shall be the amount of wet coal to be dried in kg/d and the output shall be the amount of hot air to be fed in m3/d at STP. Use the ratio of air to wet coal in (b)

(a)The hot air stream has an absolute humidity of 0.058 kg moisture/kg dry air and leaves with 0.087 kg moisture/kg dry air, calculate the mass of water in the exiting air per kilogram of wet coal fed. (b)Can the dryer reduce the wet coal moisture to 15%? If the answer is no, suggest the minimum ratio of air to wet coal for the process to be successful. (c) Automate this calculation using Microsoft Excel. The input shall be the amount of wet coal to be dried in kg/d and the output shall be the amount of hot air to be fed in m3/d at STP. Use the ratio of air to wet coal in (b)

Introduction to Chemical Engineering Thermodynamics
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
See similar textbooks
icon
Related questions
Question
2. Wet wood chips are dried in a continuous rotary dryer that operates at atmospheric pressure. The chips enter at 19C with water content of 40 wt % and must leave with a moisture content of less than 15%. Hot air is fed to the dryer at the rate of 11.6 m (STP)kg wet chips. To monitor the performance of the dryer by sampling the exiting chips and determining their moisture content directly would be a cumbersome procedure and almost impossible to automate. Instead, wet and dry-bulb thermometers are mounted in both inlet and outlet air lines, and the moisture content of the exiting chips is determined by a material balance. Moist Air Air, 11.6 m (STP)kg wet chips T(C), T (C) DRYER Wet Chips 19C, 40 wt %water Chips + Residual moisture To monitor the performance of the dryer by sampling the exiting coal and determining their moisture content directly would be a cumbersome procedure and almost impossible to automate. Instead, wet-and dry-bulb thermometers are mounted in both the inlet and outlet air lines, and the moisture content of the exiting chips is determined by a material balance calculator. (STP: Standard Temperature and Pressure is o"C and 101.325 kPa) (a)The hot air stream has an absolute humidity of 0.058 kg moisture/kg dry air and leaves with 0.087 kg moisture/kg dry air, calculate the mass of water in the exiting air per kilogram of wet coal fed. (b)Can the dryer reduce the wet coal moisture to 15%? If the answer is no, suggest the minimum ratio of air to wet coal for the process to be successful. (c) Automate this calculation using Microsoft Excel. The input shall be the amount of wet coal to be dried in kg/d and the output shall be the amount of hot air to be fed in m3/d at STP. Use the ratio of air to wet coal in (b)
Transcribed Image Text:2. Wet wood chips are dried in a continuous rotary dryer that operates at atmospheric pressure. The chips enter at 19C with water content of 40 wt % and must leave with a moisture content of less than 15%. Hot air is fed to the dryer at the rate of 11.6 m (STP)kg wet chips. To monitor the performance of the dryer by sampling the exiting chips and determining their moisture content directly would be a cumbersome procedure and almost impossible to automate. Instead, wet and dry-bulb thermometers are mounted in both inlet and outlet air lines, and the moisture content of the exiting chips is determined by a material balance. Moist Air Air, 11.6 m (STP)kg wet chips T(C), T (C) DRYER Wet Chips 19C, 40 wt %water Chips + Residual moisture To monitor the performance of the dryer by sampling the exiting coal and determining their moisture content directly would be a cumbersome procedure and almost impossible to automate. Instead, wet-and dry-bulb thermometers are mounted in both the inlet and outlet air lines, and the moisture content of the exiting chips is determined by a material balance calculator. (STP: Standard Temperature and Pressure is o"C and 101.325 kPa) (a)The hot air stream has an absolute humidity of 0.058 kg moisture/kg dry air and leaves with 0.087 kg moisture/kg dry air, calculate the mass of water in the exiting air per kilogram of wet coal fed. (b)Can the dryer reduce the wet coal moisture to 15%? If the answer is no, suggest the minimum ratio of air to wet coal for the process to be successful. (c) Automate this calculation using Microsoft Excel. The input shall be the amount of wet coal to be dried in kg/d and the output shall be the amount of hot air to be fed in m3/d at STP. Use the ratio of air to wet coal in (b)
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 8 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Recommended textbooks for you
Introduction to Chemical Engineering Thermodynami…
Introduction to Chemical Engineering Thermodynami…
Chemical Engineering
ISBN:
9781259696527
Author:
J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:
McGraw-Hill Education
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
Process Dynamics and Control, 4e
Process Dynamics and Control, 4e
Chemical Engineering
ISBN:
9781119285915
Author:
Seborg
Publisher:
WILEY
Industrial Plastics: Theory and Applications
Industrial Plastics: Theory and Applications
Chemical Engineering
ISBN:
9781285061238
Author:
Lokensgard, Erik
Publisher:
Delmar Cengage Learning
Unit Operations of Chemical Engineering
Unit Operations of Chemical Engineering
Chemical Engineering
ISBN:
9780072848236
Author:
Warren McCabe, Julian C. Smith, Peter Harriott
Publisher:
McGraw-Hill Companies, The
SEE MORE TEXTBOOKS