Q6: A fuel gas consisting of 90 mol % methane and 10 mol % nitrogen is burned with 25% excess air in a continuous water heater. Both fuel gas and air enter dry at 77 °F. Water is heated at a rate of 80 lbm/s from 77 F to 200°F. The flue gases leave the heater at 410°F. Of the entering methane, 70% burns to carbon dioxide and 30% burns to carbon monoxide. What volumetric flow rate of fuel gas is required if there are no heat losses to the surroundings?

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
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Q6: A fuel gas consisting of 90 mol % methane and 10 mol% nitrogen is burned with 25% excess air in a
continuous water heater. Both fuel gas and air enter dry at 77 °F. Water is heated at a rate of 80 lbm/s
from 77 F to 200°F. The flue gases leave the heater at 410°F. Of the entering methane, 70% burns to
carbon dioxide and 30% burns to carbon monoxide. What volumetric flow rate of fuel gas is required if
there are no heat losses to the surroundings?
Transcribed Image Text:Q6: A fuel gas consisting of 90 mol % methane and 10 mol% nitrogen is burned with 25% excess air in a continuous water heater. Both fuel gas and air enter dry at 77 °F. Water is heated at a rate of 80 lbm/s from 77 F to 200°F. The flue gases leave the heater at 410°F. Of the entering methane, 70% burns to carbon dioxide and 30% burns to carbon monoxide. What volumetric flow rate of fuel gas is required if there are no heat losses to the surroundings?
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