Exhaust gas from a chemical process flows at a rate of 8000 acfm from point A at 250 degrees F and 1 atm pressure. It is flows through a circular duct to a fan where the pressure is boosted by 4 inches of water and then flows to an incinerator. Fuel gas is burned at a rate of 75 pounds per hour and the temperature of the exhaust gas is 1200 degrees F. Assuming both the process exhaust and incinerator exhaust streams have properties similar to air, calculate the enthalpy that has been added by burning the fuel gas. Assume that you can recover heat from the incinerator exhaust by purchasing aheat exchanger to cool the gases to 500 degrees F while recovering the useful heat. Assuming that such heat is worth $7/million Btu, how much money could you save by recovering the heat ($/day)
Exhaust gas from a chemical process flows at a rate of 8000 acfm from point A at 250 degrees F and 1 atm pressure. It is flows through a circular duct to a fan where the pressure is boosted by 4 inches of water and then flows to an incinerator. Fuel gas is burned at a rate of 75 pounds per hour and the temperature of the exhaust gas is 1200 degrees F. Assuming both the process exhaust and incinerator exhaust streams have properties similar to air, calculate the enthalpy that has been added by burning the fuel gas. Assume that you can recover heat from the incinerator exhaust by purchasing aheat exchanger to cool the gases to 500 degrees F while recovering the useful heat. Assuming that such heat is worth $7/million Btu, how much money could you save by recovering the heat ($/day)
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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Question
Exhaust gas from a chemical process flows at a rate of 8000 acfm from point A at 250
degrees F and 1 atm pressure. It is flows through a circular duct to a fan where the
pressure is boosted by 4 inches of water and then flows to an incinerator. Fuel gas is
burned at a rate of 75 pounds per hour and the temperature of the exhaust gas is 1200
degrees F. Assuming both the process exhaust and incinerator exhaust streams have
properties similar to air, calculate the enthalpy that has been added by burning the fuel
gas. Assume that you can recover heat from the incinerator exhaust by purchasing aheat
exchanger to cool the gases to 500 degrees F while recovering the useful heat. Assuming
that such heat is worth $7/million Btu, how much money could you save by recovering
the heat ($/day)
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