The Flow Of Gases In Furnaces

264

APPENDIX VII

TABLE 16—Continued

Gas on Gas
Air on Air
Gas on Waste Gas
Air on WasfceGas

The volume occupied by the checker brick will be = weight
Xy-gVo~:
15-minute cycle = . . .

56 m3 86 75 m3 82 94 m3 78
5m3 19 1200° 5.4040 28 m3 05 -S00°
4.00
100 m3 90 133 m3 94 157 m3 38
7m3 58 1100° 5.0370 38 m3 18 -1000°
5.00

20-minute cyclic ==....

25~minute cycle = . . . .

Pass volume in choekerwork : Qn of gan, air, waste gases .
5m3 32 850° 4.1195 21 m3 92 +700°
3.50 76 m3 72
8m3 51 750° 3.7525 31 m3 93 -1-900°
4.50 143 m3 68

t° average in checker. . . .

1-Kd for average /° ...........
QoX(l +<*/) = ........

Temperature change. .

Average; lim ! in checker seconds, 200° per second change in L . . Basing pass volume on gas and air heating time, the pass volume = Average time in checkers of waste ga,seH, revised to pass volume, seconds ..........

2.735
4775 cu ft 5372 cu ft 6040 cu ft
3.763
8613 cu ft 9778 cu ft 10600 cu ft

Total checker volume: 15-minute cycle ........
133 m3 58 152 m3 54 171 m3 50
42.57 57.43 49.70 50.29 55.26 44.74
0.6689
244 m3 58 277 m3 62 301m 3 06
41.26 58.74 48.25 51.75 52.28 47.72

20-ininute cycle. . ........

25-mirmte cycle ...........

Percentage of Hpaec occupied by Brick, lf)-miuute cycle ........ PasB .................. . .

Brick, 2Q-tninute cycle ........

Pass ........................

Brick, 25~minuto cycle ........

Pans ...... ... ...............

In order to provide a margin for all possible contingencies, the 25 minute, cycle will bo used lining square paHHCH, the diameter of unit piiHH = \/() 4474 ~ ......

= v'o "4772 = ......
0.6808

Brick = 1 0000 — 0 0080= .......
0.3311

1 000') — 0 0808= .......
0.3192
7. 5 in. 2. 5 in 5.0 in

Make both alike tmHedongas, using a 2.f> in. (f».'J mm.) briek: Dim<insion of unit pass = 63-=-
0 ,'W = h =r ........
190mm 63mm 127mm

Brick thiekncKH , . . . .........

Diameter square pa«B .........