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A fuel oil is fed to a furnace and burned with 25% excess air. The oil contains 87.0 wt % C, 10.0% H, and 3.0% S. Analysis of the furnace exhaust gas shows only N2, Oz, CO2, SO2, and H,0. The sulfur dioxide emission rate is to be controlled by passing the exhaust gas through a scrubber, in which most of the SO, is absorbed in an alkaline solution. The gases leaving the scrubber (all of the N2, O2, and CO2, and some of the H2O and SO, entering the unit) pass out to a stack. The scrubber has a limited capacity, however, so that a fraction of the furnace exhaust gas must be bypassed directly to the stack.

A fuel oil is fed to a furnace and burned with 25% excess air. The oil contains 87.0 wt % C, 10.0% H, and 3.0% S. Analysis of the furnace exhaust gas shows only N2, Oz, CO2, SO2, and H,0. The sulfur dioxide emission rate is to be controlled by passing the exhaust gas through a scrubber, in which most of the SO, is absorbed in an alkaline solution. The gases leaving the scrubber (all of the N2, O2, and CO2, and some of the H2O and SO, entering the unit) pass out to a stack. The scrubber has a limited capacity, however, so that a fraction of the furnace exhaust gas must be bypassed directly to the stack.

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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3. A fuel oil is fed to a furnace and burned with 25% excess air. The oil contains 87.0 wt% C, 10.0% H. and 3.0% S. Analysis of the furnace exhaust gas shows only N2, O2, CO,, SO,, and H,O. The sulfur dioxide emission rate is to be controlled by passing the exhaust gas through a scrubber, in which most of the SỐ, is absorbed in an alkaline solution. The gases leaving the scrubber (all of the N2, O2, and CO,2, and some of the H2O and SO, entering the unit) pass out to a stack. The scrubber has a limited capacity, however, so that a fraction of the furnace exhaust gas must be bypassed directly to the stack. At one point during the operation of the process, the scrubber removes 90% of the SO, in the gas fed to it, and the combined stack gas contains 612.5 ppm (parts per million) SO, on a dry basis: that is, every million moles of dry stack gas contains 612,5 moles of SO2. Calculate the fraction of the exhaust bypassing the scrubber at this moment.
Transcribed Image Text:3. A fuel oil is fed to a furnace and burned with 25% excess air. The oil contains 87.0 wt% C, 10.0% H. and 3.0% S. Analysis of the furnace exhaust gas shows only N2, O2, CO,, SO,, and H,O. The sulfur dioxide emission rate is to be controlled by passing the exhaust gas through a scrubber, in which most of the SỐ, is absorbed in an alkaline solution. The gases leaving the scrubber (all of the N2, O2, and CO,2, and some of the H2O and SO, entering the unit) pass out to a stack. The scrubber has a limited capacity, however, so that a fraction of the furnace exhaust gas must be bypassed directly to the stack. At one point during the operation of the process, the scrubber removes 90% of the SO, in the gas fed to it, and the combined stack gas contains 612.5 ppm (parts per million) SO, on a dry basis: that is, every million moles of dry stack gas contains 612,5 moles of SO2. Calculate the fraction of the exhaust bypassing the scrubber at this moment.
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