Method and apparatus for improving efficiency of Uhle Boxes in the process of paper production by applying a homogeneous mixture of superheated humid air

摘要

The invention comprises a method for improving efficiency of uhle boxes in the process of paper manufacturing. The essence of the invention is the use of a homogeneous mixture of superheated humid air in the press section of a paper machine. A very intense mixing of air and steam takes place in venturi injector which creates a uniform mixture, with appropriate composition and temperature, directed to a blowing nozzle. The mixture is then used in the forced flow through felt to a suction slot installed under the felt. The correct mixture composition ensures its minimum density, maximum speed and minimum time of flow through felt. It is important because the flow takes place when felt is running fast. The time ratio of the flow of homogeneous mixture of superheated humid air versus longitudinal movement of felt equals the actual working surface area of the suction slot. Extended working area directly influences the quality of felts conditioning and paper dewatering in the press section.

主权项

1. The method of improving efficiency of Uhle Boxes in the process of paper production by blowing a homogeneous mixture of superheated humid air through the felt to the Uhle Box, wherein:
said mixture (not pure steam and not hot dry air) is homogeneous and superheated by a minimum of 20 F. above the saturation point and is created in the mixing process of air with superheated steam; temperature of said mixture is between 175-260 F; absolute pressure of said mixture is between 15.5-16.5 PSI.