F - Mech Eng,Light,Heat,Weapons – 26 – B
Patent
F - Mech Eng,Light,Heat,Weapons
26
B
122/30, 34/53
F26B 21/06 (2006.01) D21F 5/02 (2006.01)
Patent
CA 1249719
ABSTRACT OF THE DISCLOSURE A supply of steam is fed to a drying cylinder (10) from a steam line (20) through a steam pressure control valve (22). Condensate and steam are removed from the drying cylin- der to a separator (32). The pressure of the removed steam is controlled by a steam pressure control valve (36) and the rate of condensate removal is monitored by a condensate removal mon- itor (48). A computer controller (16) adjusts the steam feed and removal pressure control valves to maintain the smallest differential pressure therebetween which will maintain the con- densate removal rate substantially constant. The computer con- troller sets an initial pressure differential during an ini- tializing step (50). In a first pressure differential adjust- ment step (52), the computer decreases the pressured differen- tial in first increments until the condensate removal rate be- gins to decrease. In response to the decrease, the first pres- sure differential adjusting step increases the pressure differ- ential by the first increment. A second pressure differential adjusting step (54) functions like the first pressure differen- tial adjusting step but uses a smaller increment. A checking step (56) periodically increases the pressure differential by the second increment and returns the program to the second pressure differential adjusting step to reestablish an optimal pressure differential.
462869
Hercules Incorporated
Macrae & Co.
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