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A fire-tube steam boiler must produce 1.2 kg/s of saturated steam with 4% humidity, at 140°C. The boiler burns wood with 15% humidity and 30% excess air. Performance was analyzed based on values measured over a time interval. The boiler is fed with water at 75°C. The composition of firewood (dry basis) is: C = 52%, H = 8%, O = 35%, N = 5%. The overall yield is 80% (based on PCi). Determine: a) The lower calorific value of the fuel; b) The enthalpy of steam, c) Firewood consumption (kg/h);

A fire-tube steam boiler must produce 1.2 kg/s of saturated steam with 4% humidity, at 140°C. The boiler burns wood with 15% humidity and 30% excess air. Performance was analyzed based on values measured over a time interval. The boiler is fed with water at 75°C. The composition of firewood (dry basis) is: C = 52%, H = 8%, O = 35%, N = 5%. The overall yield is 80% (based on PCi). Determine: a) The lower calorific value of the fuel; b) The enthalpy of steam, c) Firewood consumption (kg/h);

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: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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A fire-tube steam boiler must produce 1.2 kg/s of saturated steam with 4% humidity, at 140°C. The boiler burns wood with 15% humidity and 30% excess air. Performance was analyzed based on values measured over a time interval. The boiler is fed with water at 75°C. The composition of firewood (dry basis) is: C = 52%, H = 8%, O = 35%, N = 5%. The overall yield is 80% (based on PCi). Determine: a) The lower calorific value of the fuel; b) The enthalpy of steam, c) Firewood consumption (kg/h); d) The volume of air supply to the furnace (in m³n/h); e) The total volume of gases produced (in m³n/h); f) The CO₂ content, on a dry basis, expected in the chimney; g) The evaporation rate; h) The composition of the exhaust gases on a volumetric basis.
Transcribed Image Text:A fire-tube steam boiler must produce 1.2 kg/s of saturated steam with 4% humidity, at 140°C. The boiler burns wood with 15% humidity and 30% excess air. Performance was analyzed based on values measured over a time interval. The boiler is fed with water at 75°C. The composition of firewood (dry basis) is: C = 52%, H = 8%, O = 35%, N = 5%. The overall yield is 80% (based on PCi). Determine: a) The lower calorific value of the fuel; b) The enthalpy of steam, c) Firewood consumption (kg/h); d) The volume of air supply to the furnace (in m³n/h); e) The total volume of gases produced (in m³n/h); f) The CO₂ content, on a dry basis, expected in the chimney; g) The evaporation rate; h) The composition of the exhaust gases on a volumetric basis.
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