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1. A fuel contains by mass 88% C, 8% H2, 1% S and 3% ash (silica). a. Calculate the stoichiometric/ theoretical air needed in combustion. b. If the air supplied is 20% more than the stoichiometric value, find the analysis of the dry products by mass (% product/total mass of DRY products). Remember that the flue gas will contain nitrogen gas and excess oxygen gas as well.

1. A fuel contains by mass 88% C, 8% H2, 1% S and 3% ash (silica). a. Calculate the stoichiometric/ theoretical air needed in combustion. b. If the air supplied is 20% more than the stoichiometric value, find the analysis of the dry products by mass (% product/total mass of DRY products). Remember that the flue gas will contain nitrogen gas and excess oxygen gas as well.

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
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ADDITIONAL SAMPLE PROBLEMS (FUELS) 1. A fuel contains by mass 88% C, 8% H2, 1% S and 3% ash (silica). a. Calculate the stoichiometric/ theoretical air needed in combustion. b. If the air supplied is 20% more than the stoichiometric value, find the analysis of the dry products by mass (% product/total mass of DRY products). Remember that the flue gas will contain nitrogen gas and excess oxygen gas as well. 2. Calculate the % of each dry product when coal is burned stoichiometrically in air (when coal is burned in the theoretical amount of air). The analysis of the coal is: 80% C, 10% H2, 5% S, and 5% ash. Calculate the stoichiometric ratio (air:fuel ratio) by mass. 3. A fuel is a mixture of 60% methane (CH, ), 30% carbon monoxide (CO), and 10% oxygen (O2 ) by volume. Calculate the theoretical oxygen needed in combustion. 4. A gaseous fuel contains: 5% CO2, 40% H2, 40% CH4, 15% N2 by volume. Determine the theoretical air needed and the % content of each dry product. 5. 1.8 g of a coal sample was weighed in a silica crucible. After heating for an hour at 110°C, the residue weighed 1.680 g. The crucible was then covered with a vented lid and strongly heated for exactly seven minutes at 950 ± 20 °C. The residue weighed 0.910 g. The crucible was then heated without the cover, until a constant weight was obtained. The last residue was found to be 0.250 g. Determine the ash, moisture, volatile matter and fixed carbon content of the coal sample. 6. 1.00g of a sample of coal was burnt completely in bomb calorimeter. The calorific value of coal was found to be 8,600 cal/g. The ash formed in calorimeter was extracted with acid and the acid extract was heated with barium chloride solution and a precipitate of barium sulfate was obtained. The precipitate was filtered, dried and weighed and was found to be 0.10 g. Calculate the percentage of sulfur in the sample.
Transcribed Image Text:ADDITIONAL SAMPLE PROBLEMS (FUELS) 1. A fuel contains by mass 88% C, 8% H2, 1% S and 3% ash (silica). a. Calculate the stoichiometric/ theoretical air needed in combustion. b. If the air supplied is 20% more than the stoichiometric value, find the analysis of the dry products by mass (% product/total mass of DRY products). Remember that the flue gas will contain nitrogen gas and excess oxygen gas as well. 2. Calculate the % of each dry product when coal is burned stoichiometrically in air (when coal is burned in the theoretical amount of air). The analysis of the coal is: 80% C, 10% H2, 5% S, and 5% ash. Calculate the stoichiometric ratio (air:fuel ratio) by mass. 3. A fuel is a mixture of 60% methane (CH, ), 30% carbon monoxide (CO), and 10% oxygen (O2 ) by volume. Calculate the theoretical oxygen needed in combustion. 4. A gaseous fuel contains: 5% CO2, 40% H2, 40% CH4, 15% N2 by volume. Determine the theoretical air needed and the % content of each dry product. 5. 1.8 g of a coal sample was weighed in a silica crucible. After heating for an hour at 110°C, the residue weighed 1.680 g. The crucible was then covered with a vented lid and strongly heated for exactly seven minutes at 950 ± 20 °C. The residue weighed 0.910 g. The crucible was then heated without the cover, until a constant weight was obtained. The last residue was found to be 0.250 g. Determine the ash, moisture, volatile matter and fixed carbon content of the coal sample. 6. 1.00g of a sample of coal was burnt completely in bomb calorimeter. The calorific value of coal was found to be 8,600 cal/g. The ash formed in calorimeter was extracted with acid and the acid extract was heated with barium chloride solution and a precipitate of barium sulfate was obtained. The precipitate was filtered, dried and weighed and was found to be 0.10 g. Calculate the percentage of sulfur in the sample.
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