SU1049599A1 - Sheet and web material dryier - Google Patents

Abstract

DRYER FOR SHEET AND ROLL MATERIALS, including installed; characterized in that in order to reduce energy consumption and improve the quality of the material, it is provided with an air-permeable-mm cylinder from end discs and longitudinal ribs fixed in them and mounted for rotation inside a perforated cylinder in such a way that the distance from the outer surface of the perforated cylinder to the outer surface of the ribs of the air-permeable cylinder is equal to the fault of the length of the sound wave excited by the longitudinal ribs of both Cylinder-, |, moat as they rotate.VMI

Description

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The invention relates to the pulp and paper, textiles and other industries and is used for drying web and sheet materials.

Closest to the proposed in / out dryer for sheet and roll materials, including a rotatably mounted perforated cylinder with longitudinal ribs fixed on its inner surface, a distribution chamber, a semi-ring distributor, a perforated cylinder 1-1 and 1 1-mm internal perforated core for supplying a diverter, and a 1-hole perforated cylinder for supplying or dispensing a perforated cylinder for supplying or discharging a perforated cylinder and 1-1 an internal perforated core for supplying or discharging a perforated cylinder and a 1-1-m guide pins and fl casing

When the web moves along the outer surface of the perforated cylinder, the movement of air through the pores of the dried web is achieved by creating a pressure differential between the outer and inner surfaces of the cylinder.

The drawback of the device is its high power consumption. process, since to overcome the threshold pressure required for the removal of moisture from the pores of the dried material, a significant pressure drop is required on both sides of the fabric. For many types of paper, the creation of large pressure drops leads to yxycause of the quality of the web as a result of the disruption of its structure.

The purpose of the invention is to reduce energy consumption and improve the quality of the web,

This goal is achieved by the fact that the dryer for sheet and roll materials, including a rotatably mounted perforated cylinder with longitudinal edges fixed on its inner surface, a semi-circular distribution chamber enclosing the perforated cylinder and having an internal perforated wall for supplying or discharging heat carrier, guide rollers and sealing casing, provided with an air-permeable cylinder consisting of SIZED discs and longitudinal ribs fixed in them rotatably inside the perforated cylinder so that the distance from the outer surface of the perforated cylinder to the outer surface of the ribs of the air-permeable cylinder is half the length of the sound wave excited by the longitudinal ribs of both cylinders as they rotate,

FIG. 1 shows a device, a longitudinal section; in fig. 2 - then HSE,. cross section.

The device includes a perforated drive cylinder 1 with longitudinal ribs 2, an air-permeable cylinder 3 made of longitudinal ribs 4 fixed in end discs 5 with seals 6, a semi-circular distribution chamber 7 with an internal perforated wall 8 for removing or supplying heat carrier, guide rollers 9 and sealing casing 10,

The perforated cylinder 1 and the air-permeable cylinder 3 are attached to the cantilever in the bearing bearings, respectively, 11 and 12,

A drive pulley 13 is mounted on the axle of the breathable cylinder 3.

Fastening - a perforated cylinder can be done by other means, for example, on external rolling rollers.

The distance 5 from the outer surface of the perforated cylinder 1 to the outer surface of the ribs 4 of the cylinder 3 is equal to the half wavelength of the sound wave excited by the longitudinal edges of the perforated cylinder and the air-permeable cylinder as they rotate and is determined by

V

 - about

2 f,.

where V is the speed of sound, m / s;

lOj - the frequency of rotation of the edges of both

cylinders each relative

friend / s

The operation of the device is as follows.

The web, being dried, covering the perforated cylinder 1, moves with its speed of rotation. In the annular gap between the rotating cylinder 1 with the longitudinal ribs 2 and the rotating air-permeable cylinder 3 with the ribs 4, oscillations of the air are excited.

If the distance from the outer surface of the perforated cylinder 1 to the outer surface of the ribs 4 of the air-permeable cylinder 3 is equal to half the length of the sound wave excited lengthwise / 1 and the ribs during the rotation of the cylinder, intense vibrations of the air medium with the maximum amplitude occur. At the same time, due to intense high-frequency oscillations: with a maximum amplitude, the moisture in the capillaries of the dried material changes its phase state, i.e. turns into an aerosol, which is easily entrained by the flow of heat-transfer air coming from the half-ring chamber 7 surrounding the cylinder through the perforated wall 8 into the cylinder 3, or vice versa from the cavity 3 through perforation into the cavity of chamber 7, the air entering the cylinder 3 is removed through its hollow trunnion. If the rotational speed of the cylinder 1 is insufficient, then to increase the frequency of modulation of the air flow 5, the air-permeable cylinder 3 is rotated in the direction opposite to the rotation of cylinder 1, ensuring

thus the maximum amplitude of oscillation of the air environment.

Thus, in the dryer of this design, significantly lower pressure drops are required to remove moisture from the material, which leads to a reduction in energy consumption and an increase in the quality of the web.

Claims (1)

A DRYER FOR SHEET AND ROLLED MATERIALS, including a rotatable perforated cylinder with longitudinal ribs fixed on its inner surface, a semicircular distribution chamber that encloses a perforated cylinder and has an inner perforated wall for supplying or discharging coolant, guiding rollers and different sealing skin that, in order to reduce energy consumption and improve the quality of the material, it is equipped with a breathable cylinder consisting of ends x disks and longitudinal ribs fixed in them and installed with the possibility of rotation inside the perforated cylinder in such a way that the distance from the outer * surface of the perforated cylinder to the outer surface of the ribs of the air-permeable cylinder is equal to half the sound wavelength, exciting my longitudinal ribs of both cylinders during their rotation. 4 ^ from