SU1174509A1 - Versions of hydrocyclone for cleaning fibrous slurry - Google Patents

Abstract

1. A hydrocyclone for cleaning a fibrous suspension, including a housing with a nozzle for feeding the initial suspension flow and transporting it along a helical line to an end opening for cleaning the purified fraction and formed on the inner surface of the housing and covering it along the perimeter with a groove for waste disposal, characterized by that, in order to increase the cleaning efficiency while reducing energy consumption, the groove is made along a helix, directed opposite to the helix line of the flow of the initial suspension ii. 2. A hydrocyclone for cleaning a fiber suspension, including a housing with a nozzle for feeding the initial suspension flow and transporting it along a helical line to an end opening for withdrawing the cleaned fraction and a housing on the inner surface and covering it along the perimeter of the waste opening opening, characterized by that, in order to increase cleaning efficiency while reducing energy consumption, the groove is made tapered and the top of the cone is oriented in the direction of the nozzle for supplying the original spenzii and the opening for removing waste formed in the zone of greatest diameter of the groove.

Description

BACKGROUND OF THE INVENTION The invention relates to direct-flow hydrocyclones used to clean a fiber suspension primarily in the pulp and paper industry.

The purpose of the invention is to increase the efficiency of purification of the suspension while reducing energy consumption, achieved by eliminating the leaching of waste from the area adjacent to the opening for their removal, and mixing the waste with the stream of purified suspension.

FIG. 1 shows a hydrocyclone, a general view; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. one; in fig. 4 and 5 — node I in FIG. 1 (construction variants).

The hydrocyclone for cleaning the fiber suspension contains a housing 1 with a nozzle 2 for feeding a stream of initial suspension and transporting it along a helical line to an end opening 3 for draining the cleaned fraction and formed on the inner surface of the housing covering it along the perimeter of the groove 4 with the opening 5 for waste disposal. The groove 4 (Fig. 5) can be made along a helix, directed opposite to the helix of the feed stream of the initial suspension, and conical within the shell of the body 1 (Fig. 1), or lengthened by the tides on the body 1, and the hole 5 is made in zone of the largest diameter of the conical groove 4 and is oriented tangentially (Fig. 3) or in the axial direction.

The housing 1 from the inlet face is provided with a lid 6 made of transparent material and a pressure chamber 7 surrounding it. In the housing 1 in the area of the latter, a tangential outlet 8 is made. The housing 1 in the area of the outlet face hole 3 is covered by a drain chamber 9 with a discharge pipe 10 , moreover, a nozzle for removal of light waste is fixed along the axis of the housing 1 in the area of the end opening 3. The cavity of the housing 1 communicates through the groove 4 with the waste collection chamber 11.

Hydrocyclone works as follows.

The initial slurry through pipe 2 under pressure is fed into the pressure chamber 7, from which through the outlet 8 it is tangentially introduced into the cavity of the hydrocyclone body 1. Due to the overpressure of the feed and the tangential introduction of the suspension, a rotational motion is imparted. In this case, heavy foreign inclusions (e.g. sand) contained in the initial suspension are thrown to the inner wall of the housing and in the wall layer they move along the helical trajectory in the axial direction. Meeting in its path groove 4,

heavy inclusions are thrown into it by centrifugal forces, from where they are then output through the opening 5 into the waste collection chamber 11 and then out of the device. Light extraneous inclusions contained in the initial suspension and air are collected in the form of a rope in the axial zone of the housing cavity and discharged from the device through the nozzle. The cleaned suspension through the end outlet 3 is led out of the cavity into the receiving chamber 9 and out through the pipe 10 out of the device. The transparent end cap 6 allows control of the suspension cleaning process.

Since the groove 4 covers the perimeter of the body 1 of the hydrocyclone, all the heavy waste distributed over the cross-section of the wall layer enters it. Performing grooves 4 conical shape improves efficiency

cleaning, since at the same time waste, falling into it as in a pocket, cannot be washed out of it with a stream of cleaned suspension. The presence of tides on the body of 1 hydrocyclone allows to increase the depth of the groove 4

(Fig. 4) and thereby minimize the likelihood of leaching of waste from the zone of their discharge into the cleaned suspension.

During the cleaning process, the slurry moves in the housing cavity along a helical path,

The same trajectory has heavy waste in the near-wall layer. The pitch of the helix along which the waste moves depends on many parameters, including the geometrical dimensions of the hydrocyclone, the parameters of the initial suspension (velocity at

inlet, density, solids content, etc.), Consequently, it is difficult to establish the location of the groove 4 in the housing 1, there is a possibility that the helix pitch is large compared to

the width of the groove 4, and the particles in the waste stream, crossing it at an angle, have kinetic energy sufficient to bypass the groove 4 and move further with the stream of purified suspension. To reduce this effect, groove 4

the screw form is made (fig. 5), and the screw axis of the groove 4 has a direction opposite to the screw axis of the suspension flow. When crossing the screw paths grooves and

The waste stream of the latter crosses the groove in at least two sections, thereby improving the efficiency of waste disposal, with the groove pitch being chosen equal to or somewhat larger than the trajectory of the screw flow of the suspension.

The screw shape of the groove 4 (FIG. 5) can be combined with the screw shape of the hole 5 formed therein to discharge waste. This increases the flow area

holes 5, waste is discharged more quickly and over a larger portion of the perimeter of housing 1, thereby reducing the likelihood

clogging up the waste of the purified suspension, increases the cleaning efficiency while reducing energy consumption.

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Claims (2)

1. A hydrocyclone for cleaning a fibrous suspension, including a housing with a pipe for supplying a stream of the initial suspension and transporting it along a helical line to the end hole for the ovode of the cleaned fraction and made on the inner surface of the housing and a groove covering the perimeter with a hole for waste disposal, different the fact that, in order to increase the cleaning efficiency while reducing energy consumption, the groove is made along a helix directed opposite to the helical feed line of the flow of the initial suspension. 2. A hydrocyclone for cleaning a fibrous suspension, comprising a housing with a nozzle for supplying a stream of the initial suspension and transporting it along a helical line to the end opening for removal of the purified fraction and the groove made on the inner surface of the housing and surrounding it along the perimeter with an opening for waste disposal, characterized in that, in order to improve cleaning efficiency while reducing energy consumption, the groove is made cone-shaped and the apex of the cone is oriented in the direction of the pipe for supplying the initial suspension and, and the hole for the removal of waste is made in the zone of the largest diameter of the groove.