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Full text of "The Flow Of Gases In Furnaces"

MISCELLANEOUS TABLES                             185
TABLE 5
HOT BLAST STOVES, EMPIRICAL DATA
B'ast temperatures range from 500 to 1000.
Heating surface ranges from 7 to 25 square meters (average 20 square meters)
per cubic meter per millimeter of blast.    (Withwell Stoves.)
Cowper stoves.    Velocity of cold blast in checker 1.50 to 2.00 m per sec.
Velocity of hot blast in checker 5.00 to 8.00 m per sec.
Volume to be taken at the temperature and pressure.
Le Chatelier states that the heat interchange rate is
650 cal. per square meter per hour for 250 temperature difference.
TABLE 6
FUHNACE TEMPERATURES
From Le Chatelier and Damour:
Glass tank, bottle glass.................................       1425
Annealing lehr.......................................        585
Gas retort setting, top..................................       1190
Bottom.............................................       1060
Porcelain kilns, hard porcelain...........................       1400
Chinaware...........................................       1275
Brick kilns, various sources:
Building brick, cones 015a to 2a........................    800-1170
Vitrified pavers, cones la to 14.........................   1150-1410
Glazed brick, cones 6a to 9a...........................   1250-1310
Firebrick, cones 6 to 20...............................   1250-1530
From Harbison and Walker Co., Catalogue:
Glass furnace between the pots...........................   1375
In pots, refining......................................   1310
In pots, working.....................................   1045
Tanks melted for casting..............................   1310
Annealing glassware....................................   444- 555
Crucible steel furnace, Siemens varies from................   1460-1590
. A rough method of estimating temperatures:
Just glowing in the dark.................................        525
Dark red..............................................        700
Cherry red............................................        908
Bright cherry red.......................................       1000
Orange................................................       1150
White.................................................       1300
Dazzling white........................................       1500