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1. Natural gas usually contains a mixture of methane and ethane. Methane (CH4) and ethane (C₂H6) undergo combustion in a furnace. Air, along with another stream of pure O2, are fed to the furnace. The reactor effluent, stream A, has a total molar flow rate, composition, and T and P as shown in the schematic. The reactor effluent is fed to a 1st condenser (C1), in which all of the water (and none of the other chemicals) is condensed and removed. The remaining components are fed to a 2nd condenser (C2). However, the maximum capacity through the condenser is 80 kmol/h; the remainder of the reactor effluent bypasses the condenser. All of the ethane (and none of the other chemicals) in the feed to C2 is condensed (hence the reason that this type of natural gas is given the strange name of "natural gas liquid") and removed. The gas stream leaving C2 is mixed with the bypass stream, to form the stack gas. a. Calculate the volumetric flow rate of stream A, in m³/h b. Calculate the volumetric flow rate of stream A in SCMH c. Calculate the partial pressure of O₂ in stream A. d. Write the chemical reaction(s) that occur in the furnace. e. Completely label the schematic. Note: you do not need to assign variable names when the actual flow rate is obvious. f. Calculate the flow rate of each component in each stream, in kmol/h, and write them on each stream in the schematic. g. Calculate the percent excess oxygen fed to the furnace, considering the total of oxygen fed to the furnace from both the air and pure oxygen streams. h. Calculate the concentration of ethane in the stack gas, in ppm

1. Natural gas usually contains a mixture of methane and ethane. Methane (CH4) and ethane (C₂H6) undergo combustion in a furnace. Air, along with another stream of pure O2, are fed to the furnace. The reactor effluent, stream A, has a total molar flow rate, composition, and T and P as shown in the schematic. The reactor effluent is fed to a 1st condenser (C1), in which all of the water (and none of the other chemicals) is condensed and removed. The remaining components are fed to a 2nd condenser (C2). However, the maximum capacity through the condenser is 80 kmol/h; the remainder of the reactor effluent bypasses the condenser. All of the ethane (and none of the other chemicals) in the feed to C2 is condensed (hence the reason that this type of natural gas is given the strange name of "natural gas liquid") and removed. The gas stream leaving C2 is mixed with the bypass stream, to form the stack gas. a. Calculate the volumetric flow rate of stream A, in m³/h b. Calculate the volumetric flow rate of stream A in SCMH c. Calculate the partial pressure of O₂ in stream A. d. Write the chemical reaction(s) that occur in the furnace. e. Completely label the schematic. Note: you do not need to assign variable names when the actual flow rate is obvious. f. Calculate the flow rate of each component in each stream, in kmol/h, and write them on each stream in the schematic. g. Calculate the percent excess oxygen fed to the furnace, considering the total of oxygen fed to the furnace from both the air and pure oxygen streams. h. Calculate the concentration of ethane in the stack gas, in ppm

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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CH4 C₂H6 air fumace 0₂ Stream A 100 kmol/h 1.25% CH4 1.25% C₂H₂ 5.0% CO₂ 2.5%CO 12.5% H₂O 10.0% O₂ 67.5% N₂ T=400°C PABS=5 atm C1 H₂O (liquid) Bypass Stream 80 kmol/h (gas) C2 C₂He (liquid) Stack gas
Transcribed Image Text:CH4 C₂H6 air fumace 0₂ Stream A 100 kmol/h 1.25% CH4 1.25% C₂H₂ 5.0% CO₂ 2.5%CO 12.5% H₂O 10.0% O₂ 67.5% N₂ T=400°C PABS=5 atm C1 H₂O (liquid) Bypass Stream 80 kmol/h (gas) C2 C₂He (liquid) Stack gas
1. Natural gas usually contains a mixture of methane and ethane. Methane (CH4) and ethane (C₂H6) undergo combustion in a furnace. Air, along with another stream of pure O2, are fed to the furnace. The reactor effluent, stream A, has a total molar flow rate, composition, and T and P as shown in the schematic. The reactor effluent is fed to a 1st condenser (C1), in which all of the water (and none of the other chemicals) is condensed and removed. The remaining components are fed to a 2nd condenser (C2). However, the maximum capacity through the condenser is 80 kmol/h; the remainder of the reactor effluent bypasses the condenser. All of the ethane (and none of the other chemicals) in the feed to C2 is condensed (hence the reason that this type of natural gas is given the strange name of "natural gas liquid") and removed. The gas stream leaving C2 is mixed with the bypass stream, to form the stack gas. a. Calculate the volumetric flow rate of stream A, in m³/h b. Calculate the volumetric flow rate of stream A in SCMH c. Calculate the partial pressure of O₂ in stream A. d. Write the chemical reaction(s) that occur in the furnace. e. Completely label the schematic. Note: you do not need to assign variable names when the actual flow rate is obvious. f. Calculate the flow rate of each component in each stream, in kmol/h, and write them on each stream in the schematic. g. Calculate the percent excess oxygen fed to the furnace, considering the total of oxygen fed to the furnace from both the air and pure oxygen streams. h. Calculate the concentration of ethane in the stack gas, in ppm
Transcribed Image Text:1. Natural gas usually contains a mixture of methane and ethane. Methane (CH4) and ethane (C₂H6) undergo combustion in a furnace. Air, along with another stream of pure O2, are fed to the furnace. The reactor effluent, stream A, has a total molar flow rate, composition, and T and P as shown in the schematic. The reactor effluent is fed to a 1st condenser (C1), in which all of the water (and none of the other chemicals) is condensed and removed. The remaining components are fed to a 2nd condenser (C2). However, the maximum capacity through the condenser is 80 kmol/h; the remainder of the reactor effluent bypasses the condenser. All of the ethane (and none of the other chemicals) in the feed to C2 is condensed (hence the reason that this type of natural gas is given the strange name of "natural gas liquid") and removed. The gas stream leaving C2 is mixed with the bypass stream, to form the stack gas. a. Calculate the volumetric flow rate of stream A, in m³/h b. Calculate the volumetric flow rate of stream A in SCMH c. Calculate the partial pressure of O₂ in stream A. d. Write the chemical reaction(s) that occur in the furnace. e. Completely label the schematic. Note: you do not need to assign variable names when the actual flow rate is obvious. f. Calculate the flow rate of each component in each stream, in kmol/h, and write them on each stream in the schematic. g. Calculate the percent excess oxygen fed to the furnace, considering the total of oxygen fed to the furnace from both the air and pure oxygen streams. h. Calculate the concentration of ethane in the stack gas, in ppm
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