Solved: A coal from Illinois which has an ultimate

Chapter 15, Problem 1535

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QUESTION:

A coal from Illinois which has an ultimate analysis (by mass) as 67.40 percent C, 5.31 percent H2, 15.11 percent O2, 1.44 percent N2, 2.36 percent S, and 8.38 percent ash (non-combustibles) is burned with 40 percent excess air. Calculate the mass of air required per unit mass of coal burned and the apparent molecular weight of the product gas neglecting the ash constituent. A

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QUESTION:

A coal from Illinois which has an ultimate analysis (by mass) as 67.40 percent C, 5.31 percent H2, 15.11 percent O2, 1.44 percent N2, 2.36 percent S, and 8.38 percent ash (non-combustibles) is burned with 40 percent excess air. Calculate the mass of air required per unit mass of coal burned and the apparent molecular weight of the product gas neglecting the ash constituent. A

ANSWER:

Step 1 of 7

Coal whose mass percentages are specified is burned with 40% excess air. The air-fuel ratio and the apparent molecular weight of the product gas are to be determined.

Assumptions are

1. Combustion is complete.

2. The combustion products contain , , , , and .

3. Combustion gases are ideal gases.

The molar masses of , , , , and air are , , , , and , respectively (Table A-1).

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