Drying and gas or vapor contact with solids – Process – Gas or vapor contact with treated material
Patent
1996-12-17
1998-05-05
Bennett, Henry A.
Drying and gas or vapor contact with solids
Process
Gas or vapor contact with treated material
34454, F26B 300
Patent
active
057460094
ABSTRACT:
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 infeed 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. Arrangements for controlling one cylinder at a time, several cylinders together for supply of both steam and air, or several cylinders for controlling respective separate supplies of air and with one supply of steam are disclosed.
REFERENCES:
patent: 2879039 (1959-03-01), Skinner
patent: 3363325 (1968-01-01), Schie
patent: 3675337 (1972-07-01), Daane
patent: 3869808 (1975-03-01), Sawyer
patent: 4089121 (1978-05-01), Sawyer
patent: 4493158 (1985-01-01), Van Os
Bennett Henry A.
Gravini Steve
Voith Sulzer Papiermaschinen GmbH
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