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TEMPERATURE CONTROL OF DRESSLER TUNNEL KILN 1
Author(s) -
Harrison T. R.
Publication year - 1923
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1923.tb17674.x
Subject(s) - pyrometer , bunsen burner , mechanics , combustion , combustor , chemistry , materials science , thermodynamics , temperature measurement , physics , organic chemistry
The method of graded adjustment of fuel supply was adopted. Adjustments to compensate for variations in quality of fuel gas, which often amounted to as high as 30% change in the gas pressure at the burners within two or three minutes, are produced through the agency of the variation in the length of a bunsen burner flame as different kinds of gas are supplied under the same pressure. The adjustment is thus made without the temperature departing from the desired value. Further minor adjustments are made according to slight departures from normal of the combustion chamber temperatures. The pyrometer control contacts are moved away from the normal position simultaneously as the gas pressure is adjusted, the magnitude of this adjustment being proportional to the necessary motion of the contact points to bring them to the momentary position of the pyrometer pointer. The contact points are then automatically returned to their normal position at a predetermined (constant or variable) rate which is the estimated rate at which the kiln should return to its normal value when the correct adjustment has been made. A sufficient correction is thus made promptly without over‐correction during the necessary period of recovery as demanded by the kiln lag.