A fire-tube steam boiler must produce 1.5 kg/s of saturated steam with 3% humidity, at 160°C. The boiler burns wood with 20% humidity and 25% excess air. Performance was analyzed based on values measured over a time interval. The boiler is fed with water at 70°C. The composition of the firewood (dry basis) is: C = 50%, H = 7%, O = 38%, N = 5%. The overall yield is 75% (based on PC₁). Determine: a) Firewood consumption (kg/h); b) The CO₂ content, on a dry basis, expected in the chimney;

A fire-tube steam boiler must produce 1.5 kg/s of saturated steam with 3% humidity, at 160°C. The boiler burns wood with 20% humidity and 25% excess air. Performance was analyzed based on values measured over a time interval. The boiler is fed with water at 70°C. The composition of the firewood (dry basis) is: C = 50%, H = 7%, O = 38%, N = 5%. The overall yield is 75% (based on PC₁). Determine: a) Firewood consumption (kg/h); b) The CO₂ content, on a dry basis, expected in the chimney;

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.

Question

A fire-tube steam boiler must produce 1.5 kg/s of saturated steam with 3% humidity, at 160°C.
The boiler burns wood with 20% humidity and 25% excess air. Performance was analyzed
based on values measured over a time interval. The boiler is fed with water at 70°C. The
composition of the firewood (dry basis) is: C = 50%, H = 7%, O = 38%, N = 5%. The overall yield
is 75% (based on PC₁). Determine:
a) Firewood consumption (kg/h);
b) The CO₂ content, on a dry basis, expected in the chimney;

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