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Engineering
Chemical Engineering
Answer all questions. You will be graded based on (1) your ability to apply knowledge of safety in handling flammable compounds, and (2) your ability to apply your knowledge of material balances to reacting and non-reactive systems. Clarity of presentation would ensure that you do not lose all the points for a calculation if you should make a mistake. 1. The percentage of fuel in a fuel-air mixture below which the mixture cannot be ignited is called the lower flammability limit (LFL), sometimes referred to as lower explosion limit (LFL). There is an upper flammability limit (UFL) also known as the upper explosion limit (UEL). For example, the LFL of propane in air is 2.3 mole % C3H8 and the UFL is 9.5 mole %. Thus, if the percentage of propane in a propane-air mixture is greater than 2.3 mole % and less than 9.5 mole %, the gas mixture can ignite if exposed to a flame or spark. A mixture of propane in air containing 4.03 mole % C3H8 (fuel gas) is fed to a combustion furnace. If there is a problem in the furnace, a stream of pure air (dilution air) is added to the flue mixture prior to the furnace inlet to make sure that ignition is not possible. (i) (ii) (iii) Draw and label a flowsheet (block flow diagram) of the fuel gas- dilution air mixing unit, assuming that the gas entering the furnace contains propane at the LFL, and do the degree-of-freedom analysis If propane flows at a rate of 150 mol C3H8/s in the original fuel-air mixture, what is the minimum molar flow rate of the dilution air? How would the actual dilution air feed rate probably compare with the value calculated in (ii)? (<,<,=) Explain. 2. A gas mixture of hydrogen and nitrogen is fed to a reactor where they react to form ammonia. The nitrogen flow rate into the reactor is 150 mol/h and the hydrogen is fed at a ratio of 4 mole H2 per mole of N2. The reaction is represented by N₂+ 3H2 → 2NH3 Of the N₂ fed to the reactor, 70% is consumed by the reaction. If the nitrogen reactor operates at steady-state, calculate the flow rate (mol/h) in the reactor out of: (i) N2 (ii) H2, and (iii) NH3

Answer all questions. You will be graded based on (1) your ability to apply knowledge of safety in handling flammable compounds, and (2) your ability to apply your knowledge of material balances to reacting and non-reactive systems. Clarity of presentation would ensure that you do not lose all the points for a calculation if you should make a mistake. 1. The percentage of fuel in a fuel-air mixture below which the mixture cannot be ignited is called the lower flammability limit (LFL), sometimes referred to as lower explosion limit (LFL). There is an upper flammability limit (UFL) also known as the upper explosion limit (UEL). For example, the LFL of propane in air is 2.3 mole % C3H8 and the UFL is 9.5 mole %. Thus, if the percentage of propane in a propane-air mixture is greater than 2.3 mole % and less than 9.5 mole %, the gas mixture can ignite if exposed to a flame or spark. A mixture of propane in air containing 4.03 mole % C3H8 (fuel gas) is fed to a combustion furnace. If there is a problem in the furnace, a stream of pure air (dilution air) is added to the flue mixture prior to the furnace inlet to make sure that ignition is not possible. (i) (ii) (iii) Draw and label a flowsheet (block flow diagram) of the fuel gas- dilution air mixing unit, assuming that the gas entering the furnace contains propane at the LFL, and do the degree-of-freedom analysis If propane flows at a rate of 150 mol C3H8/s in the original fuel-air mixture, what is the minimum molar flow rate of the dilution air? How would the actual dilution air feed rate probably compare with the value calculated in (ii)? (<,<,=) Explain. 2. A gas mixture of hydrogen and nitrogen is fed to a reactor where they react to form ammonia. The nitrogen flow rate into the reactor is 150 mol/h and the hydrogen is fed at a ratio of 4 mole H2 per mole of N2. The reaction is represented by N₂+ 3H2 → 2NH3 Of the N₂ fed to the reactor, 70% is consumed by the reaction. If the nitrogen reactor operates at steady-state, calculate the flow rate (mol/h) in the reactor out of: (i) N2 (ii) H2, and (iii) NH3

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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Show work on piece of paper, please!! Answer both questions please!!!
Answer all questions. You will be graded based on (1) your ability to apply knowledge of safety in handling flammable compounds, and (2) your ability to apply your knowledge of material balances to reacting and non-reactive systems. Clarity of presentation would ensure that you do not lose all the points for a calculation if you should make a mistake. 1. The percentage of fuel in a fuel-air mixture below which the mixture cannot be ignited is called the lower flammability limit (LFL), sometimes referred to as lower explosion limit (LFL). There is an upper flammability limit (UFL) also known as the upper explosion limit (UEL). For example, the LFL of propane in air is 2.3 mole % C3H8 and the UFL is 9.5 mole %. Thus, if the percentage of propane in a propane-air mixture is greater than 2.3 mole % and less than 9.5 mole %, the gas mixture can ignite if exposed to a flame or spark. A mixture of propane in air containing 4.03 mole % C3H8 (fuel gas) is fed to a combustion furnace. If there is a problem in the furnace, a stream of pure air (dilution air) is added to the flue mixture prior to the furnace inlet to make sure that ignition is not possible. (i) (ii) (iii) Draw and label a flowsheet (block flow diagram) of the fuel gas- dilution air mixing unit, assuming that the gas entering the furnace contains propane at the LFL, and do the degree-of-freedom analysis If propane flows at a rate of 150 mol C3H8/s in the original fuel-air mixture, what is the minimum molar flow rate of the dilution air? How would the actual dilution air feed rate probably compare with the value calculated in (ii)? (<,<,=) Explain. 2. A gas mixture of hydrogen and nitrogen is fed to a reactor where they react to form ammonia. The nitrogen flow rate into the reactor is 150 mol/h and the hydrogen is fed at a ratio of 4 mole H2 per mole of N2. The reaction is represented by N₂+ 3H2 → 2NH3 Of the N₂ fed to the reactor, 70% is consumed by the reaction. If the nitrogen reactor operates at steady-state, calculate the flow rate (mol/h) in the reactor out of: (i) N2 (ii) H2, and (iii) NH3
Transcribed Image Text:Answer all questions. You will be graded based on (1) your ability to apply knowledge of safety in handling flammable compounds, and (2) your ability to apply your knowledge of material balances to reacting and non-reactive systems. Clarity of presentation would ensure that you do not lose all the points for a calculation if you should make a mistake. 1. The percentage of fuel in a fuel-air mixture below which the mixture cannot be ignited is called the lower flammability limit (LFL), sometimes referred to as lower explosion limit (LFL). There is an upper flammability limit (UFL) also known as the upper explosion limit (UEL). For example, the LFL of propane in air is 2.3 mole % C3H8 and the UFL is 9.5 mole %. Thus, if the percentage of propane in a propane-air mixture is greater than 2.3 mole % and less than 9.5 mole %, the gas mixture can ignite if exposed to a flame or spark. A mixture of propane in air containing 4.03 mole % C3H8 (fuel gas) is fed to a combustion furnace. If there is a problem in the furnace, a stream of pure air (dilution air) is added to the flue mixture prior to the furnace inlet to make sure that ignition is not possible. (i) (ii) (iii) Draw and label a flowsheet (block flow diagram) of the fuel gas- dilution air mixing unit, assuming that the gas entering the furnace contains propane at the LFL, and do the degree-of-freedom analysis If propane flows at a rate of 150 mol C3H8/s in the original fuel-air mixture, what is the minimum molar flow rate of the dilution air? How would the actual dilution air feed rate probably compare with the value calculated in (ii)? (<,<,=) Explain. 2. A gas mixture of hydrogen and nitrogen is fed to a reactor where they react to form ammonia. The nitrogen flow rate into the reactor is 150 mol/h and the hydrogen is fed at a ratio of 4 mole H2 per mole of N2. The reaction is represented by N₂+ 3H2 → 2NH3 Of the N₂ fed to the reactor, 70% is consumed by the reaction. If the nitrogen reactor operates at steady-state, calculate the flow rate (mol/h) in the reactor out of: (i) N2 (ii) H2, and (iii) NH3
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