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Full text of "The Flow Of Gases In Furnaces"

DESIGN OF OPEN-HEARTH FURNACES

231

amount of heat given to the checkerwork by the products of
combustion.

The maximum quantity of gas required will be

3.5 (cu m per kg) X 1.25(kg coal) =4.375 cu m per second.
The maximum quantity of air required will be

4.375X1.87 = 8.182 cu m per second.

The maximum volume of the products of combustion will be
4.375X2.68 = 11.725 cu m per second.

These volumes are reduced to zero C. and 760 mm of barometric
pressure.

The average volumes will be as follows:

of gas:   3.5X0.5(kg of coal) = 1.75 cu m per second

of air:   1.75 X1.87 = 3.273 cu m per second

of products of combustion: 1.75X2.68 = 4.69 cu m per second

Reversal Period = t

20 Minutes,
1200 Seconds

30 Minutes,
1800 Seconds

Gas:

Maximum calories=4.375X228.5X2= .
Air:

Maximum calories=4.375X546.6XZ= .
Gas:

Average calories = 1.75 X 228.5 X t = .
Air:

Average calories    = 1.75 X 546. 6X t = .

1,200,000

2,871,000

480,000

1,148,000

1,800,000

4,306,000

720,000

1,722,000

Allowing for a range of 200 in the checker brick

and 90 per cent of its weight as effective, the

weight of brick required will be
For gas:

20 min.: 1,200,000-s- (200X0.25X0.90) =.....

30 min.: 1,800,000-K200X 0.25X0.90) =.....

For air:

20 min.: 2,871,000-s- (200X0.25XQ.90) =.....

30 min.: 4,306,000-r (200X0.25X0.90) =.....

26,667kg
63,800 kg

40,000 kg
95,680 kg