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Full text of "The Flow Of Gases In Furnaces"

DESIGN OF OPEN-HEARTH FURNACES

229

Total coal consumption = 300X50 = 15,000 kg (for the 500
minutes). The average coal consumption will be 30 kg per
minute, or 0.5 kg per second. The maximum rate of coal con-
sumption will be approximately 1.25 kg per second. This coal
gasified in a producer supplies 3.5 cu m of gas per kilogram of coal
gasified and this gas, burned with 40 per cent excess air, requires
1.87 volumes of air per 1 volume of gas and the products of
combustion will be 2.68 volumes. Fig. 183 shows the heat capacity
and calorific intensity curves of the producer gas, the air supply
and the waste gases, as computed according to the methods of
Mallard and Le Chatelier. These curves are based upon the
combustion or burning of 100 molecular volumes or 2,232 cu m
of the gas fuel under consideration for use in the furnaces.


	Required
		Available from
	

	for
		Products of
	

	Heating
		Combustion
	

	Gas
	Air
	Gas
	Air


	Checker
	Checker
	Checker
	Checker

Temp, top of checkerwork, degrees. . .
	200
	1200
	1700
	1700

Temp, bottom of checker, degrees ....
	600
	300
	800
	600

Temp, increase or decrease, degrees. . .
	600
	900
	900
	1100

Heat capacity in calories at. ...   1700
	
	
	4140
	4140

(Based upon 100 molecular        %o
	960
	1700
	1750
	

volumes of the gas burnt             0 from curve of Fig. 183) . .
 oUU
	450
	480
	
	1250

Heat  in  calories  per  100  molecular
	
	
	
	

volumes of gas burnt to be given or
	
	
	
	

absorbed from checkerwork ........
	510
	1220
	2390*
	2890*

Heat in calories per cubic meter of gas
	
	
	
	

burnt to be given out by or absorbed
	
	
	
	

by checkerwork
	228.5
	546.6
	1071*
	1295*


				
* These values give the total amount of heat available in 'the products of combustion of
100 molecular volumes or 1 cu m of the gas cooled through the assumed temperature range
of either the gas or the air checker, and which must be divided between the. two checkers.
By assuming that 2 cu m of gas are burned the proportion of
the products of combustion required for the heating of the two
checkers may be arrived at: