JPS6136987B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention comprises a separation chamber consisting of a circular copper body with a tangential inlet for the feed mixture and a central outlet for the lighter components and an outlet for the heavier components as well as a conical section. and at least one guide member is provided to impart a radially inward motion component to the weight component so as to flow helically along the wall of the cone, one of which is of relatively low density. The present invention relates to a hydrocyclone separator for separating a mixture into a lighter first component and a heavier second component which is relatively dense.

Hydrocyclone separators have many uses. One of the main ones is in the cellulose industry for the purification of cellulose fiber suspensions. Typically, a hydrocyclone separator system includes several stages connected in series with each stage comprising several hydrocyclone separators connected in parallel with both inlet and outlet chambers in common. Such hydrocyclone separator systems separate the original, highly dilute cellulose suspension into diluted and purified fibers, called the "light components," and concentrated impurities, called the "heavy components." . As modern manufacturing technology advances, the temperature of cellulose suspensions has increased, causing a decrease in viscosity. As the viscosity decreases and the number of steps remains the same, the separation capacity of the hydrocyclone separator system decreases and more cellulose fibers are discarded along with the weight components. It goes without saying that it is desirable that the weight component contains as little cellulose fiber as possible. At the same time, from an environmental point of view, the aim is to keep the volume flow of the heavy component to a low degree, which leads to a high concentration of impurities in this component. The problem lies in the effective separation of a relatively low density first light component from a relatively high density second heavy component and hydrocyclone separation of the heavy component as a relatively highly concentrated small stream. An object of the present invention is to provide a hydrocyclone separator that discharges water from the machine.

Many attempts have been made, some on a commercial scale, to solve the problem of fiber loss and plugging of relatively heavy components at the outlet.
Most of these attempts require pressurized water to be supplied to individual hydrocyclone separators to dilute heavy components and wash out valuable fibers. Generally, water is passed either tangentially near the heavy component outlet end of the hydrocyclone separator, or through a groove with an end radially a distance from the hydrocyclone separator wall within the heavy component outlet end. Supplied. A tangential inlet for the diluent in the form of a cylinder or cone is provided and a discharge chamber is used which is directly connected to the outlet of the heavy component of the hydrocyclone separator. At most,
These attempts only solve the clogging problem and reduce fiber loss to a certain extent.

Attempts have been made to provide the conical section of a hydrocyclone separator with an axially oriented guide member, with the aim of imparting a weight component radially inwardly directed and flowing obliquely along the walls of the conical section. , transporting the light component from the heavy component into the light component flowing towards its outlet. This desired result could not be achieved with the devices described above.

It is obvious to make the outlet for the heavy components larger than before. However, this is not possible because such a design would result in an excessive flow of heavy components. Furthermore, the aforementioned axially extending guide member occupies part of the separation space within the cone of the separation chamber. Considering the friction to which these guide members are subjected, they must be designed with a larger radial extent than is functionally necessary. Eliminating this drawback regarding separation space means reducing the cone angle. This means that the conical part of the separation chamber does not converge rapidly, but it means that if the diameter of the divergence of the outlet of the heavy component is kept at that dimension, the conical part of the separation chamber will be quite long. That's why it's not easily possible.

According to the invention, the above-mentioned problems regarding fiber loss and clogging of the drain for heavy components can be solved by replacing the guiding device designed as a (guiding) channel along the inner wall of the conical part with a hydrocyclone according to the technique described in the preamble. This is solved in a surprisingly simple way by providing the separator in the vicinity of the outlet of the cone, where this helical passage directs the heavy components flowing towards the outlet of the cone in an axial direction towards the separation chamber. It gives an inward motion component. In this case, the guide device is preferably designed as a spiral channel.

According to this device arrangement, the hydrocyclone separator, whose guide device is preferably designed as a spiral passage, does not overexert the flow of the heavy components, since its outlet for the heavy components has a certain size. The cone angle of the conical section can be reduced in order to provide space for the guide member without occupying the otherwise available separation chamber space.

The advantages of the invention are thus obtained by combining the axial guide member and the said guide device, which are known per se.

In an embodiment of the invention, the guide device is designed to impart a radially inward motion component to the weight component flowing towards the outlet of the conical section.

According to the present invention, compared to a typical hydrocyclone separator for cellulose fiber suspensions, a purified cellulose suspension is obtained, i.e. in the heavy components discharged without increasing the content of impurities in the light components. cellulose fiber loss is reduced by more than half of what was previously common. The reduced cellulose fiber content moves with the weight component so that this component flows more easily through the outlet. Furthermore, as mentioned above, this outlet is designed with an even larger outlet. The risk of clogging is thus virtually eliminated.

Hereinafter, the present invention will be explained in detail using one embodiment shown in the drawings.

As shown in Figure 1, a hydrocyclone separator with a circular copper body part 1 and a conical part 2 has a tangential inlet 3 for the mixed feed to be separated, a central outlet 4 for the lighter components, and a central outlet 4 for the heavier components. It has an outlet 5 from the conical part. The conical part 2 has four guide members 6 extending in the axial direction and distributed evenly over the circumference of the conical part.
is provided. These guide members are arranged as ridges in a symmetrical arrangement in cross-section as seen in FIG. The height of these ridges increases in the direction towards the outlet 5. A guide device 7 is provided between the guide member 6 and the outlet 5, which is designed as a guide channel in the form of a helical channel which is rotated by 11/2 turns along the inner wall of the conical part 2. This helical passage is designed to give the heavier components an axial component to the flow, ie in the direction of the central outlet 4 for the lighter components, when flowing towards the outlet 5 . If the hydrocyclone separator is viewed from the inlet end, the flow moves clockwise, but the helical passage of the guide device 7 is arranged to rotate counterclockwise.

In the illustrated embodiment, the helical channel surface is inclined with respect to the horizontal plane towards the outlet 5, so that the weight component flowing towards the outlet 5 is also given a radially inward motion component.

As shown, the guide device 7 is designed in such a way that the discharge area is relatively large, ie the heavy components can pass freely.

The operation of the published hydrocyclone is as follows. The mixture to be separated into a lighter first component of relatively low density and a heavier second component of relatively high density is fed through the inlet 3 and passes through the cone of the hydrocyclone separator. It flows spirally towards part 2. The heavier components tend to move closer to the walls, while the lighter components tend to move in a direction towards the axis of symmetry of the hydrocyclone separator. However, some of the lighter components remain in the flow near the wall. When the flow reaches the guide device 7, the light component, which is the main part of the flow, changes its direction of motion and flows toward the outlet 4 without changing its direction of rotational motion, while the heavy component, which is a part of it, changes its direction of motion and flows toward the outlet 4 without changing its direction of rotational motion. It is discharged through the discharge port 5. After passing through the guide member 6, this flow is bent inward towards the axis of symmetry of the hydrocyclone separator and the lightweight components are brought into contact with the light component stream and flow towards the outlet 4. The guide device 7 prevents an excessive amount of flow from being discharged through the outlet 5. In the illustrated embodiment, the guide device 7 has a helical passage which is inclined with respect to the horizontal plane, so that favorable flow conditions are obtained in the vicinity of the guide device 7, which results in an effective separation result.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a hydrocyclone separator according to the present invention showing the guide device in perspective, FIG. 2 is a cross-sectional view taken along the line - of FIG. 1, and FIG. FIG. 2 is a cross-sectional view taken along the line - of FIG. 1, shown in perspective; 1... Cylindrical part, 2... Conical part, 3... Tangential inlet, 4... Central discharge port, 5... Discharge port, 6...
Guide member, 7... guide device.

Claims (1)

Claims: 1. For separating a mixture into a relatively low density first component and another relatively high density second component, with a tangential inlet 3 for the feed mixture and a lightweight It comprises a cylindrical part 1 with a central outlet 4 for the components and a conical part 2 forming an outlet 5 for the heavy components, with at least one guide member 6 guiding the heavy components along the wall of the conical part 2. In a hydrocyclone separator that creates a spiral flow and gives it a radially inward motion component, the discharge port 5 of the conical part 2
has a guiding device 7 designed as at least one guiding channel arranged along the inner wall of the conical part 2 in the vicinity of the conical part 2, which guide device separates the heavy components as they flow towards the outlet 5 of the conical part 2. A hydrocyclone separator characterized in that it is configured to impart an axially inward motion component towards the chambers 1, 2. 2. The guiding device is designed to cause the weight component to flow towards the outlet 5 of the conical part 2 and impart a radially inward motion component.
Hydrocyclone separator as described in section. 3. Hydrocyclone separator according to claim 1 or 2, characterized in that the guide device 7 is designed as a spiral channel.