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Full text of "The Flow Of Gases In Furnaces"

DESIGN  OF OPEN-HEARTH FURNACES

279


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

Frictional resistance of fantails for air and gas: Q0 = volume of gases .........
	5 m332
	8 m3 51
	5 m3 19
	7 ms 58

Qt = QQ(l-}~oit) = .   .   .
	15 m3 08
	13 m3 19
	20 m3 43
	24 m3 27

i}t = Qt -r- a? = m per sec
	5 m 03
	2 m  51
	6 m 81
	4 m  62

A0 = specific weight gases .... At = Ao -r- ( 1 -\-ctt) = kg per m3. . L^co =   .
	1.125 0.397 10 00
	1.293 0.834 11 43
	1.32 0.335 10 00
	1.32 0.412 11 43

y = frictional resistance IL. kg per m'- = 0.016X10.00X5.03X0.397 =
	0 kg 320
	
	
	

0.016X11.43X2.51X0.834 =
	
	0 kg 383
	
	

0 016X10 00X6 81X0 335 =
	
	
	0 kg 338
	

0 016X11.43X4.62X0 412 =
	
	
	
	0 kg 359

The pressure necessary to impress their velocity upon the flowing gases will be: 8 = A/?;/2 -r- Id] = ker ner m2 .....
	0.512
	0.268
	0.795
	0.454


	Stack Flue to Boiler or Chimney
	Stack Flue from Air Valve
	Stack Flue from Gas Valve

Frictional resistance of flues: L = length in meters ................
	5 m  00
	4m  00
	8 m  00

$ s= perimeter in meters ..............
	8 m  00
	8 m 00
	7 m  00

co = area in square meters
	4m200
	4m2 00
	3 m2 00

SL  co =                                  ......
	10 00
	8 00
	18 67

Qo = volume of gases flowing per sec . . . t = average temperature ...........
	12 m3 77 630
	7m3 58 550
	5m3 19 750

1 ~\~a.t  gas factor      ...................
	3.312
	3.0185
	3 7525

Qf = Qo(l -\-otC) average volume gas
	42 m3 29
	22 m3 89
	19 m3 48

vi = Qt-z-(Jl) = velocity m per sec
	10 m  58
	5m 72
	6 m  50

AO ^ specific weight of flue gases .....
	1 kg 32
	
	

AI = AO -r- ( 1 -\-ott}  kg per m3 gas ......
	0 399
	0.437
	0 352

7=frictional resistance in kg per m2 = 0 016X10 00X10.58X0.399 =
	0 kg 676
	
	

0 016X 8 OOX 5 72X0 437 =
	
	0 kg 320
	

0 016X18 67X 6 50X0 352 =
	
	
	0 kg 684

The pressure necessary to impress the velocity upon the gases in these flues will be : 5 = A,(?;,2-~20> =ke t>er m2 = ............
	2.250
	0.730
	0.760