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Example 8.3-6 ENVIRONMENTAL Equipment Encyclopedia www.wiley.com/college/felder Energy Balance ora Waste-Heat Boiler Eliminating discharges of hot streams to the environment has two beneficial effects: the temperature of the receiving entity (e.g., a lake, a river, or the atmosphere) is not raised, which can avoid violating an EPA regulation, and the energy contained in the discharged stream is not wasted by being dissipated in the environment. For example, a gas stream at 500°C containing 8.0 mol CO and 92.06 CO that was originally going to be sent up a stack is instead sent to a heat exchanger and flows across tubes through which water is flowing. The water enters at 25°C and is fed at a ratio of 0.200 mol water/mol hot gas, is heated to its boiling point, and forms saturated steam at 5.0 bar. The steam may be used for heating or power generation in the plant or as the feed to another process unit. The heat exchanger can be assumed to operate adiabatically that is, all heat transferred from the hot gas goes to heat the water, as opposed to some of it leaking through the heat exchanger walls to the environment. The flowchart for an assumed basis of 1.00 mal feed gas is shown below. Calculate the temperature of the gas leaving the heat exchanger (ausing data from Tables B.1 and B2 but not using APEx:/(b) using APEX 1.00 mol gas, 500C 8.0% CO2.0% CO₂ 0.200 mol H₂025°C, 5.0 bar) 100 0.200 mol H₂O (v. 5.0 bar, sard)

Example 8.3-6 ENVIRONMENTAL Equipment Encyclopedia www.wiley.com/college/felder Energy Balance ora Waste-Heat Boiler Eliminating discharges of hot streams to the environment has two beneficial effects: the temperature of the receiving entity (e.g., a lake, a river, or the atmosphere) is not raised, which can avoid violating an EPA regulation, and the energy contained in the discharged stream is not wasted by being dissipated in the environment. For example, a gas stream at 500°C containing 8.0 mol CO and 92.06 CO that was originally going to be sent up a stack is instead sent to a heat exchanger and flows across tubes through which water is flowing. The water enters at 25°C and is fed at a ratio of 0.200 mol water/mol hot gas, is heated to its boiling point, and forms saturated steam at 5.0 bar. The steam may be used for heating or power generation in the plant or as the feed to another process unit. The heat exchanger can be assumed to operate adiabatically that is, all heat transferred from the hot gas goes to heat the water, as opposed to some of it leaking through the heat exchanger walls to the environment. The flowchart for an assumed basis of 1.00 mal feed gas is shown below. Calculate the temperature of the gas leaving the heat exchanger (ausing data from Tables B.1 and B2 but not using APEx:/(b) using APEX 1.00 mol gas, 500C 8.0% CO2.0% CO₂ 0.200 mol H₂025°C, 5.0 bar) 100 0.200 mol H₂O (v. 5.0 bar, sard)

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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How was 0.00360 kg H20 obtained for in and out?  

PDF *Elementary Principles of Chemic X + 70°F Mostly cloudy File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf Draw T Read aloud Example 8.3-6 ENVIRONMENTAL Equipment Encyclopedia boiler www.wiley.com/college/felder Solution (OH-O + 442 of 695 O OD equation and solve for T Example 8.3-6 illustrates this procedure. Energy Balance of a Waste-Heat Boiler Eliminating discharges of hot streams to the environment has two beneficial effects: the temperature of the receiving entity (e.g., a lake, a river, or the atmosphere) is not raised, which can avoid violating an EPA regulation, and the energy contained in the discharged stream is not wasted by being dissipated in the environment. For example, a gas stream at 500°C containing 8.0 mol% CO and 92.0% CO that was originally going to be sent up a stack is instead sent to a heat exchanger and flows across tubes through which water is flowing. The water enters at 25°C and is fed at a ratio of 0.200 mol water/mol hot gas, is heated to its boiling point, and forms saturated steam at 5.0 bar. The steam may be used for heating or power generation in the plant or as the feed to another process unit. The heat exchanger can be assumed to operate adiabatically that is, all heat transferred from the hot gas goes to heat the water, as opposed to some of it leaking through the heat exchanger walls to the environment. The flowchart for an assumed basis of 1.00 mol feed gas is shown below. Calculate the temperature of the gas leaving the heat exchanger (a) using data from Tables B.1 and B 2 but not using APEx:/(b) using APEX. 0.200 mol H₂O 25°C, 5.0 bar) 1.00 mol gas, 500°C 8.0% C 92.0% CO, 1.00 mol gas T(°C) 8.0% CO, 92.0% CO₂ Since no material balances are required in this problem, we may proceed directly to the energy balance, which for this adiabatic unit reduces to Q Search out Note that we do not write AH and n; since a quantity (1 mol feed gas and not a flow rate has been assumed as a basis of calculation. (Exercise: What assumptions have been made in writing the energy balance?) +co AH = Σn;H₁ - Σn;; = 0 in CO₂ H₂O References CO, 500°C, 1 atm), CO₂(g, 500°C, 1 atm), H₂O(1, triple point) Substance Ĥ in Ĥ out nin 0.200 mol H₂O (v, 5.0 bar, sat'd) 0.080 mol 0.920 mol 0.00360 kg 0 kJ/mol 0 kJ/mol A3 (kJ/kg) H nout To flare 0.080 mol 0.920 mol 0.00360 kg A₁ (kJ/mol) Ĥ₂ (kJ/mol) A4 (kJ/kg) {" J 63 50 D ENG Sign in (0) + 0 6:02 PM 5/13/2023
Transcribed Image Text:PDF *Elementary Principles of Chemic X + 70°F Mostly cloudy File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf Draw T Read aloud Example 8.3-6 ENVIRONMENTAL Equipment Encyclopedia boiler www.wiley.com/college/felder Solution (OH-O + 442 of 695 O OD equation and solve for T Example 8.3-6 illustrates this procedure. Energy Balance of a Waste-Heat Boiler Eliminating discharges of hot streams to the environment has two beneficial effects: the temperature of the receiving entity (e.g., a lake, a river, or the atmosphere) is not raised, which can avoid violating an EPA regulation, and the energy contained in the discharged stream is not wasted by being dissipated in the environment. For example, a gas stream at 500°C containing 8.0 mol% CO and 92.0% CO that was originally going to be sent up a stack is instead sent to a heat exchanger and flows across tubes through which water is flowing. The water enters at 25°C and is fed at a ratio of 0.200 mol water/mol hot gas, is heated to its boiling point, and forms saturated steam at 5.0 bar. The steam may be used for heating or power generation in the plant or as the feed to another process unit. The heat exchanger can be assumed to operate adiabatically that is, all heat transferred from the hot gas goes to heat the water, as opposed to some of it leaking through the heat exchanger walls to the environment. The flowchart for an assumed basis of 1.00 mol feed gas is shown below. Calculate the temperature of the gas leaving the heat exchanger (a) using data from Tables B.1 and B 2 but not using APEx:/(b) using APEX. 0.200 mol H₂O 25°C, 5.0 bar) 1.00 mol gas, 500°C 8.0% C 92.0% CO, 1.00 mol gas T(°C) 8.0% CO, 92.0% CO₂ Since no material balances are required in this problem, we may proceed directly to the energy balance, which for this adiabatic unit reduces to Q Search out Note that we do not write AH and n; since a quantity (1 mol feed gas and not a flow rate has been assumed as a basis of calculation. (Exercise: What assumptions have been made in writing the energy balance?) +co AH = Σn;H₁ - Σn;; = 0 in CO₂ H₂O References CO, 500°C, 1 atm), CO₂(g, 500°C, 1 atm), H₂O(1, triple point) Substance Ĥ in Ĥ out nin 0.200 mol H₂O (v, 5.0 bar, sat'd) 0.080 mol 0.920 mol 0.00360 kg 0 kJ/mol 0 kJ/mol A3 (kJ/kg) H nout To flare 0.080 mol 0.920 mol 0.00360 kg A₁ (kJ/mol) Ĥ₂ (kJ/mol) A4 (kJ/kg) {" J 63 50 D ENG Sign in (0) + 0 6:02 PM 5/13/2023
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