Temperature control in paper machine

Details Temperature control in paper machine Temperature control in paper machine

D - Textiles, Paper

21

F

D21F 5/06 (2006.01)

Patent

CA 2174718

A process and apparatus for controlling the surface temperature of a drying cylinder of a paper machine, in which air may be admixed with the steam introduced into the drying cylinder to adjust the partial steam pressure. The mixture ratio of air and steam is controlled as a function of the measured temperature of the mixture discharging from the drying cylinder. Also, pressure measurements are made of the pressure in the in- feed and discharge lines of the cylinder, and valves control this dependent on the measurements. The valves are controlled to provide all steam to the cylinder above a predetermined minimum pressure in the cylinder below 1 bar and to provide a mix of air and steam below the predetermined minimum pressure.

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