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: McGraw-Hill Education
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9.64. Methane at 25°C is burned in a boiler furnace with 10.0% excess air preheated to 100°C. Ninety percent of the methane fed is consumed, the product gas contains 10.0 mol CO2/mol CO, and the combustion products leave the furnace at 400°C. (a) Calculate the heat transferred from the furnace, -Q(kW), for a basis of 100 mol CH, fed/s. (The greater the value of -Q, the more steam is produced in the boiler.) (b) Would the following changes increase or decrease the rate of steam production? (Assume the fuel feed rate and fractional conversion of methane remain constant.) Briefly explain your answers. (i) Increasing the temperature of the inlet air; (ii) increasing the percent excess air for a given stack gas temperature; (iii) increasing the selectivity of CO, to CO formation in the furnace; and (iv) increasing the stack gas temperature.
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Transcribed Image Text:9.64. Methane at 25°C is burned in a boiler furnace with 10.0% excess air preheated to 100°C. Ninety percent of the methane fed is consumed, the product gas contains 10.0 mol CO2/mol CO, and the combustion products leave the furnace at 400°C. (a) Calculate the heat transferred from the furnace, -Q(kW), for a basis of 100 mol CH, fed/s. (The greater the value of -Q, the more steam is produced in the boiler.) (b) Would the following changes increase or decrease the rate of steam production? (Assume the fuel feed rate and fractional conversion of methane remain constant.) Briefly explain your answers. (i) Increasing the temperature of the inlet air; (ii) increasing the percent excess air for a given stack gas temperature; (iii) increasing the selectivity of CO, to CO formation in the furnace; and (iv) increasing the stack gas temperature.
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