SU1645327A1 - Drying roll - Google Patents

Description

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The shredding of fires to the design of the drying cylinders of paper machines and may find application in the paper industry.

The goal of the innovation is to improve operating conditions and ensure heat and efficiency.

Figure 1 shows the drying cylinder, a longitudinal section; figure 2 is the same cross section; in Fig.3 the cylinder shell, axonometrics.

The drying cylinder contains a welded sheath 1 of profiled pipes, hollow c: ice 2, flaps 3, 4, hollow trunnion 6, a heat exchanger device for supplying and discharging heat transfer medium (not rolled up in the drawings).

During the operation of the drying cylinder, the heat conduction of the medium (steam under pressure) from the feeder flows through the hollow pin 5 and the spokes 2 into the holes of the pipes having the profile of the annular sector, heats the outer surface of the drying cylinder on which the material to be dried is located. The resulting condensate under the combined action of gravity centrifugal and koriodigono is suspended and effectively removed under the effect of residual pressure to the outside with hollow spins 2, trunnion 6 and a drainage device. Readings 3 and A reduce heat exchange through the ends of the drying cylinder.

Making the pipe profile in the form of an annular sector makes it possible to produce special profiles from large diameter pipes and, consequently, reduce the number of elements from which the shell will weld. This increases the manufacturability of the manufacture of cylinder dryers. In this case, the thickness of the shell thickness increases, which facilitates the uniformity of heat transfer to its outer surface, i.e. In addition, the increase in heat efficiency is also reduced by metal lining of the drying cylinder.

The arrangement of the pipes at an angle of 5-Ie to the forming shell in the direction of rotation with the supply of heat-conducting medium in the opposite correction to the angular velocity vector of the cylinder facilitates the collection and removal of condensate.

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The creation of an olizka to create a self-new system of forces acting on steam and condensate formed by centrifugal and coriolian gravity forces. At an angle of less than 5 °, the collection and removal of condensate due to an increase in its speed slightly differs from the case of parallel arrangement of pipes relative to the generator, and at an angle of more than 15 ° it is necessary to manufacture a curvilinear profile along the length of the cylinder, otherwise the cylindrical shell is broken and a large mechanical treatment, which leads to a decrease in the thickness of the outer wall of the shell below the permissible level.

Replacing the method of manufacturing the shell of a cylinder by casting in a chill mold with more efficient operations (stamping and welding) honors techno according to the gnome of production.

Reducing the wall thickness of the cylinder and the side walls significantly reduces the intensity of the structure. Reducing the mass of the product reduces the dynamic loads on the bearing units of the dryer-cylinder, reduces their dimensions, and j -, the salts - the energy for the drive, i.e. improve: Hg performance characteristics.

The location of the shaped tubes ii with an angle to the cylinder generator will effectively remove condensate and steam, which intensifies the process of heat exchange between the heat-conducting medium and the outer surface of the cylinder, which leads to an increase in the thermal efficiency of the drying cylinder.

Claims (1)

Invention Formula A complete cylinder containing a casing of adjacent side surfaces one to another profiling: -, pipes and tags, the supply and removal of heat-conducting medium, characterized in that, in order to improve operating conditions and ensure thermal efficiency, each pipe in the cross section has a profile of the annular sector and is located at an angle of 5-15 ° to the generator of the shell in the direction of rotation of the cylinder. (Reg. I Fig.Z