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Full text of "The Flow Of Gases In Furnaces"

314

APPENDIX VIII

TABLE 4—Continued


	Blast
	Air Supply for Combustion of Gas
	
		40 Per Cent
 Excess
	80 Per Cent Excess

Volumes at 0° 760 mm per second ......
	16 m3 78 8m3 39 650° 70° 360° 4-580° 2.32
	2m3 26
 1220° 280° 750° -940° 3.75 95.0 2 m3 15 182.0 4m3 31
 16 m3 16
 5.42 3.45 11.00 19.87
 47.3° 85.5° 2m 182
 1950 375 1575 1595
	2m3 26
 1220° 280° 750° -940° 3.75 123.0 2m8 78 210.0 4m8 75
 17 m8 81
 4.94 2.21 9.98 17.13
 54.9° 94.2° 2m 405
 2220 433
 1787
 1809 18,232,000

0° 1 atmosphere
			
Temperatures, maximum                       . .
			
Minimum ........        ........
			
Average
			
Change
			
Gas factors for average temperature . .   .
			
Air supply, per cent of gas volume ......
			
Volume 0° -760 mm ............. ...
	
		
Products of combustion per cent gas
	
		
Volume 0° —760 mm ..............
	
		
Volumes   at   average  temperature  and pressure ..........        .   .
	19 m3 46
 4.50 2.02 9.14 15.66
 37.1° 63.5° 2m 626
		
Time, average, in seconds to pass through Combustion chamber  .
			
Dome .....................
			
Checker .........................
			
Total ......
			
Temperature change, average per second Based on total volume ..........
			
Based on checker only
			
Velocity, average in checker
			
Heat capacities per 100 molecular volumes from Curves.    Calories Gases at 1220° ........
			
Blast at 650° ..............
	465
		
Gases at 280° ..................
			
Blast at 70° ..........    •
	50 415
		
Difference ......
			
Calories released or absorbed per second (2. 26X44. SO -^ 100) X 1575 = ....
			
1787= ........
	
		
(16. 78X44. 80- 100) X 415=.
	3120 11,232,000
	16,078,000
	
Calories absorbed in one hour on blast = 3120X3600= .........
			
Calories released from gases in 2 . 8 hour = 10,080 seconds 1575X10.080=... .
			
1809X10,080=...
	
		
Assuming specific heat of brick =0.250 at 1 ° change in its temperature will = ___ 400,800X0.250 = 100,200 calories