1. A sample of coal was found to have the following percentage composition C= 75 %, H2 = 5.2 %, O2 = 12.8 %, N2 = 1.2 % and the rest ash. Calculate the amount of air needed for the complete combustion if 1 kg of the coal is burnt with 30 % excess air.2. A fuel contains C = 60 %, H2 = 9 %, O2 = 8 %, S = 13 %, remaining ash. Calculate the minimum quantity of air required for the complete combustion of 1kg of a fuel.3. A fuel gas has the following volumetric analysis:CH4 = 70% C3H8 = 30%Assume complete combustion with 15% excess air. Solve for the molal air-fuel ratio.

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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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1. A sample of coal was found to have the following percentage composition C= 75 %, H₂ = 5.2 %, O₂ = 12.8 %, N₂ = 1.2 % and the rest ash. Calculate the amount of air needed for the complete combustion if 1 kg of the coal is burnt with 30 % excess air.

2. A fuel contains C = 60 %, H₂ = 9 %, O₂ = 8 %, S = 13 %, remaining ash. Calculate the minimum quantity of air required for the complete combustion of 1kg of a fuel.

3. A fuel gas has the following volumetric analysis:
CH₄ = 70% C₃H₈ = 30%
Assume complete combustion with 15% excess air. Solve for the molal air-fuel ratio.

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