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Expected Boiler Performance

The document analyzes the combustion of bagasse in a boiler. It provides the ultimate analysis of bagasse, showing it is composed of 23.5% carbon, 3.25% hydrogen, 21.75% oxygen, 50% moisture, and 1.5% ash. It then calculates the theoretical air required for complete combustion of 1 pound of bagasse is 0.6699 pounds of oxygen and 2.9126 pounds of nitrogen, assuming 40% excess air. The total flue gas produced per pound of bagasse combusted is 5.0662 pounds.

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291 views3 pages

Expected Boiler Performance

The document analyzes the combustion of bagasse in a boiler. It provides the ultimate analysis of bagasse, showing it is composed of 23.5% carbon, 3.25% hydrogen, 21.75% oxygen, 50% moisture, and 1.5% ash. It then calculates the theoretical air required for complete combustion of 1 pound of bagasse is 0.6699 pounds of oxygen and 2.9126 pounds of nitrogen, assuming 40% excess air. The total flue gas produced per pound of bagasse combusted is 5.0662 pounds.

Uploaded by

Au Tagolimot
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Combustion Analysis: Expected boiler performance: MCR 220,000 lb/hr

Operating Steam Pressure - 250 psig with 92F SH Superheat Temperature Feedwater Temperature - 506F - 221

Ultimate Analysis of bagasse in % by weight Australia practice, Component Carbon, C Hydrogen, H2 Oxygen, O2 Moisture Ash Total % Weight 23.50 3.25 21.75 50.00 1.50 100.00

The combustible element in the bagasse are Carbon & Hydrogen, burning it gives off By weight: C 12 1 + + O2 32 = = CO2 44 3.67 and 2H2 4 1 + + + O2 = 2H2O 32 = 8 = 36 9

+ 2.67 =

Consider combustion of one (1) pound bagasse without excess air: 0.235 lb C requires 0.6274 lb O2 to produce 0.8624 lb CO2 0.0325lb H2 requires 0.26 lb O2 to produce 0.2925 lb H2O

However, the bagasse already contain 0.2175 lb O2. Hence, the air must supply theoretical O2 of: 0.6274 lb + .26 lb 0.2175 lb = 0.6699 lb O2

Assumed: O2 (Oxygen) is 23% by weight of air N2 (Nitrogen) is 76% by weight of air Other Gases is 1% by weight of air (Source: Encarta Premium 2007) Therefore Theoretical air required Nitrogen in air, N2 : 0.6699/0.23 : 2.9126(0.77) = = 2.9126 lbs 2.2453 lbs

Allow 40% excess air to insure complete combustion. Flue gas components for one (1) pound bagasse fuel CO2 H2O 0.8624 lb Product of combustion 0.7925 lb Product of combustion & moisture in bagasse

O2 (0.6699 X 0.40) 0.2679 lb Excess Oxygen N2 (2.2453 X 1.40) 3.1434 lb Combustion of air Total = 5.0662 lb Flue gas/lb bagasse

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