Method and apparatus for controlling a drying cylinder
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United States of America Patent
Stats
-
Sep 16, 1980
Grant Date -
N/A
app pub date -
Jul 16, 1979
filing date -
Jul 16, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention is a system for controlling the blow through steam in cylindrical dryers such as those used in the paper industry. The flow rate of the condensate is measured as is the flow rate of the steam blown through the drying cylinder. The ratio of the flow rate of the blow through steam to the flow rate of the condensate is thereby measured. Knowing the conditions of the paper going through the dryer, the desired conditions of the paper leaving the dryer and the feed steam pressure, the ideal amount of condensate can be determined and a given ratio set. The difference between the actual measured ratio and the set ratio is noted by a ratio control means and a compensation made by varying the pressure in the steam/water separator which is downstream from the drying cylinder. The amount of blow through steam for a given condensing load is thereby controlled and can be minimized.
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