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A fuel gas containing 9S mole% methane and the balance

Elementary Principles of Chemical Processes | 3rd Edition | ISBN: 9780471687573 | Authors: Richard M Felder ISBN: 9780471687573 143

Solution for problem 8.22 Chapter 8

Elementary Principles of Chemical Processes | 3rd Edition

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Elementary Principles of Chemical Processes | 3rd Edition | ISBN: 9780471687573 | Authors: Richard M Felder

Elementary Principles of Chemical Processes | 3rd Edition

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Problem 8.22

A fuel gas containing 9S mole% methane and the balance ethane is burned completely with 25% excess air. The stack gas leaves the furnace at 900C and is cooled to 450C in a waste heat boiler, a heat exchanger in which heat lost by cooling gases is used to produce steam from liquid water for heating, power generation, or process applications. (a) Taking as a basis of calculation 100 mol of the fuel gas fed to the furnace, calculate the amount of heat (kJ) that must be transferred from the gas in the waste heat boiler to accomplish the indicated cooling. (b) How much saturated steam at 50 bar can be produced from boiler feedwater at 40C for the same basis of calculation? (Assume all the heat transferred from the gas goes into the steam production.) (c) At what rate (kmoVs) must fuel gas be burned to produce 1250 kg steam per hour (an amount required elsewhere in the plant) in the waste heat boiler? What is the volumetric flow rate (m3 /s) of the gas leaving the boiler? (d) Briefly explain how the waste heat boiler contributes to the plant profitability. (Think about what would be required in its absence.)

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CEM 141 Lecture 37: Enthalpy Dr. Jian Hu th December 5 , 2016 Phase Change  Added heat is used to overcome attractive interactions between molecules  Water in the gaseous phase still exists in molecules (LDFs are the only forces overcome)  During phase changes, temperature does not change until after the phase change is complete  During melting or boiling, energy is added from the surroundings and used to overcome the IMFs between the molecules (or ions)  During condensation or freezing, energy from the formation of new interactions is being released into the surroundings Systems and Surroundings  System: the part we study  Surroundings: everything else  There may be a real or imagina

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Chapter 8, Problem 8.22 is Solved
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Textbook: Elementary Principles of Chemical Processes
Edition: 3
Author: Richard M Felder
ISBN: 9780471687573

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A fuel gas containing 9S mole% methane and the balance