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DESIGN OF OPEN-HEARTH FURNACES

27-5


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

Space required in chamber above checkerwork   by   Yesmann's formula, which was used in obtaining the height  of the heating chamber For the case in hand: QQ — volume of gases per second 1° = temperature ............
	5m3   32 1200°
	8m3   51 1200°
	5m3   19 1600°
	7m3  58 1600°

1 -{-at = gas temperature factor .... Qi=Qo(H-«£) = ...
	5.404 28 m3   75
	5.404 45 m3   99
	6.872 35 m3  66
	6.872 52 m3  08

0,2=       .............
	827
	2115
	1272
	2712

B — width of chamber =
	3m 483
	5 m 763
	3 m 483
	5 m 763

B2= .......................
	12.13
	33.21
	12.13
	33 21

BH=-                         ..........
	14,543
	39,852
	19408
	53 135

Q?-i-Bn=      .        ...........
	0 05686
	0 05306
	0 06555
	0 05104


	
	
	
	

<\/Qt* + BH = X= .............
 A ~~ coefficient
	0.3845 3 40
	0.3758 3 53
	0.4032 3 40
	0.3710 3 53

ht = AX   .
	1 m 306
	1 m 327
	1 m 372
	1 m 310

Rise of arch over chamber ......
	0 m 420
	0 m 700
	
	

Checker to skewback ...........
	1 m LSO
	0 m 900
	
	

Chamber above checkerwork: The  frictional  resistance  to  the flow of the gases will be about equivalent to the full volume for one-third the length m = coefficient of friction = . , . • S = perimeter = (2X3. 483) + (2X1 250)==
	0.016
	
	9 466
	

L — length        .....
	
	
	2 554
	

8 = perimeter = (2 X 5 . 763) + (2X1 250) =
	
	
	
	14 026

w = area = 3. 483X1. 250=...
	
	
	4 354
	

co = area = 5. 763X1. 250 = ...
	
	
	
	7 203

SL+u= 9.466-^-4.354 = .......
	
	
	2 174
	

£L-r-co = 14 026-T-7 203= .......
	
	
	
	1 947

^ = Qjj -T- co = m per sec .......
	6.60
	6 39
	8 19
	7 23

AO — specific weight gas .       . .
	1 125
	1 293
	1 32
	1 32

A;=A0-KH-<*0 kg per m3. . .
	0.2082
	0.2393
	0.1921
	0.1921