JPH07256153A - Liquid cyclone - Google Patents

Abstract

PURPOSE:To effectively separate and recover a liq. having a low content of gas at the time of separating solid and liq. with a liq. cyclone by providing a partition wall and a gas vent port respectively at the specified position of the cyclone. CONSTITUTION:A slurry, etc., are introduced into a liq. cyclone from an inlet pipe 1 and spiralled in the central cylindrical part 2 and conical bottom 3. The solid is moved downward from an outside by the centrifugal force produced by the rotation and discharged from a downstream pipe 4, and the liq. is moved to the upper cylindrical part 6 from an upstream riser pipe 5 by the ascending spiral current caused by the rotation of the slurry and discharged from an extraction pipe 7. Meanwhile, a gas to transport the slurry exists at the center of the ascending spiral current. In this case, a partition wall 9 having an almost circular horizontal cross section and having the highest point higher than the highest point of the extraction port of the extraction pipe 7 is furnished around the opening of the upstream riser pipe 5 on a diffusion wall 8, and a gas vent port 10 is provided above the extraction pipe 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid cyclone for separating solid and liquid, and more specifically,
The present invention relates to a liquid cyclone in which gas mixture in a separated liquid is reduced or suppressed.

[0002]

BACKGROUND OF THE INVENTION Hydrocyclones have been widely used in the past for separating solids and liquids. For example, in FIG. 1, when slurry or the like is introduced into the hydrocyclone from the inflow pipe 1, the slurry rotates in the middle cylindrical portion 2 and the conical lower portion 3 in a spiral shape. The solid is moved outward by the centrifugal force due to the rotation, moves downward along the inner wall of the cyclone, and is taken out from the downstream pipe 4. On the other hand, the liquid moves upward in the central part of the cyclone due to the rising vortex generated by the rotation of the slurry, moves to the upper cylindrical portion 6 through the upstream rising pipe 5, and is taken out from the liquid withdrawing pipe 7. At that time, a gas such as nitrogen gas for transporting the slurry is generated at the center of the rising vortex. When this gas moves from the upstream rising pipe 5 to the upper cylindrical portion 6, it is abruptly diffused and mixed into the liquid to be taken out, so various degassing methods have been conventionally proposed. For example, Japanese Unexamined Patent Publication No. 50-54964 discloses a device in which a gas vent valve is provided at the top of a liquid cyclone main body, and Japanese Unexamined Patent Publication No. 52-115470 discloses a device arranged in the upper part of a cyclone from the inside of an upstream rising pipe of the liquid cyclone. A device for concentrating control to the outer box of the tip via a conduit and extracting to the atmosphere from the box, and Japanese Patent Laid-Open No. 129155/1985 discloses a gas vent at the upper or lower part of a liquid cyclone upstream rising pipe. A device provided with is disclosed. However, in the conventional device, there is nothing particularly focused on suppressing the mixing of the gas into the liquid, and there is a drawback that the separation efficiency between the liquid and the gas is low. As a result of intensive studies to provide a device capable of efficiently degassing a liquid separated from a slurry or the like, the present inventors have found that the intended purpose is to provide a cylindrical partition wall in the upper cylindrical portion. The inventors have found that this is achieved and have reached the present invention.

[0003]

The gist of the present invention is a liquid cyclone for separating a solid and a liquid, which comprises a hollow conical lower part and a hollow cylindrical upper part directly connected thereto. The conical lower part has a downstream pipe, and the cylindrical upper part is partitioned into a middle cylindrical part and an upper cylindrical part which communicate with each other by a diffusion wall having the cylindrical upper part and an upstream rising pipe fitted therein. The middle cylindrical portion has an inflow pipe, and the upper cylindrical portion has a partition wall having a substantially circular horizontal cross section having a liquid discharge pipe and a highest point higher than the highest point of the liquid discharge pipe, A gas vent is provided around the opening on the diffusion wall of the upstream ascending pipe, and a gas vent for discharging gas generated in the liquid cyclone from the upper cylinder is provided above the liquid withdrawal pipe of the upper cylinder. It exists in a liquid cyclone characterized by that.

The present invention will be described in detail below. The liquid cyclone of the present invention has, roughly, a hollow conical lower part in which a slurry or the like is separated into a solid and a liquid by centrifugation and a cylindrical upper part directly connected thereto, and further the conical lower part is,
It has a downstream pipe for taking out the separated solids therebelow, and the cylindrical upper part is a diffusion wall laterally installed so as to inscribe the inner wall thereof, and the separated liquid is moved upward together with the gas. Partitioned by the upstream rising pipe fitted to the diffusion wall for allowing the slurry and the like to be introduced into a central cylindrical portion, and has an upper cylindrical portion that communicates therewith, further, the central cylindrical portion is for the slurry and the like. It has an inflow pipe for introducing, and the upper cylindrical part has a structure having a liquid withdrawal pipe for taking out the separated liquid, a gas vent and a partition.
The inner diameters of the upper and middle cylindrical portions of the liquid cyclone of the present invention generally range from 10 mm to 1220 mm,
An appropriate one is selected and used according to the required processing capacity of the classification point. Further, the dimensional ratio and apex angle of each part may be within the following ranges. That is, the inlet pipe diameter of the inflow pipe is 1/6 to 1/3 of the inner diameter of the middle cylinder portion, the inner diameter of the downstream pipe is 1/10 to 1/6 of the inner diameter of the middle cylinder portion, and the apex angle is 9 to 30. ℃.

An example of the liquid cyclone of the present invention will be described more specifically with reference to the drawings. As shown in the vertical cross-sectional view in FIG. 2 (a view taken along the line AA in FIG. 3), the main body of the hydrocyclone of the present invention has an axis line perpendicular to the ground and is directly connected to a hollow cylindrical upper part and the upper part thereof. It consists of a hollow conical lower part, and the cylindrical upper part consists of an upper cylindrical part and a middle cylindrical part. The upper cylindrical portion and the middle cylindrical portion are partitioned by a diffusion wall horizontally inscribed on the inner wall of the cylindrical upper portion and an upstream rising pipe inserted into the diffusion wall so that they can communicate with each other. The upstream rising pipe is concentrically provided so that its axis matches the axis of the hydrocyclone body. Further, an inlet pipe for introducing a stock solution such as slurry provided in the middle cylindrical portion near the diffusion wall in a direction tangential to the middle cylindrical portion, and an upper pipe near the diffusion wall in the upper cylindrical portion. A liquid withdrawal pipe is provided so as to be tangential to the cylindrical portion, and a downstream pipe for withdrawing solids is provided at the lower part of the conical shape. The present invention further has a partition wall whose axis matches the axis of the main body and a gas vent for discharging gas generated in the liquid cyclone from the upper cylindrical portion. The shape of the gas vent port is arbitrary, but it is preferably provided in a concentric tubular shape so that its axis matches the axis of the hydrocyclone body, and the pipe diameter in that case is relative to the diameter r of the upstream riser pipe. 1/3 to 1 time is preferable. The partition wall of the present invention is provided on the diffusion wall in the upper cylindrical portion so as to surround the opening portion of the ascending upstream pipe, or to be provided so as to overlap with the opening portion, and its height H (the highest point The height is equal to or higher than the height h (highest point height) of the liquid withdrawal pipe,
It is preferably 1.1 to 3 times, particularly preferably 1.5 to 2.
5 times, and the diameter R is equal to or larger than the diameter r of the upstream riser and smaller than the diameter R (main body) of the upper cylindrical portion, preferably 1/6 to 9/10 times R (main body), and particularly preferably R. It may be 1/3 to 7/10 times the (main body), and may be in a range that does not become a resistance when the liquid is extracted. The location where the gas vent port is installed may be higher than the liquid withdrawal pipe of the upper cylindrical portion, but it is most preferably provided at the top of the upper cylindrical portion.

[0006]

EXAMPLES The present invention will be described in more detail with reference to examples in which the apparatus of the present invention is applied to a glass bead-water-nitrogen system.
The present invention is not limited to the following examples unless it exceeds the gist. The following measured values were measured by the following methods.

[Table 1] * Flow rate The flow rate of the slurry was measured by an electromagnetic flow meter. The liquid flow rate was measured by an area flow meter. The nitrogen flow rate was measured by a rotor meter. Amount of mixed gas The gas was separated by a gas separator and the amount of mixed gas was measured. S
W exhibition diversion SY key

Example 1 A liquid cyclone shown in FIG. 4 was used. Particle size 75-600 microns Specific gravity 2.4-2.5
Introducing a stock solution with a spherical concentration of 20 wt% and a nitrogen content of 3 Nvol% at the cyclone inlet from the inflow pipe at an inflow rate of 18.6 m ³ / hr, and the withdrawal flow rate from the downstream pipe. Was 12.5 m ³ , the flow rate of withdrawal from the upstream liquid withdrawal pipe was 5.5 m ³ , and the withdrawal flow rate from the gas withdrawal pipe was 0.6 m ³ . The amount of nitrogen mixed in the withdrawal liquid from the liquid withdrawal pipe was 0 Nvol%.

(Example 2) [0008] When the same operation as in Example 1 was carried out except that the amount of nitrogen mixed at the cyclone inlet was 5 Nvol% in Example 1, the amount of nitrogen mixed in the liquid extracted from the liquid extraction pipe was found. Was 0 Nvol%.

(Example 3) In Example 1, when operating under the same conditions as in Example 1 except that the liquid cyclone shown in FIG. 5 was used, the amount of nitrogen mixed in the liquid extracted from the liquid extraction pipe was extracted. Was 0.05 Nvol%.

(Comparative Example 1) In Example 1, operation was carried out under the same conditions as in Example 1 except that the liquid cyclone shown in FIG. 6 was used, and the amount of nitrogen mixed in the liquid extracted from the liquid extraction pipe was 0.84 Nvol. %Met.

[0011]

According to the present invention, when a liquid cyclone is used to separate a solid from a liquid, a partition and a gas vent are provided at specific positions of the liquid cyclone to effectively separate a liquid containing less gas. It becomes possible to collect.

[Brief description of drawings]

FIG. 1 shows an example of a conventional liquid cyclone that has been conventionally used.

FIG. 2 is a view taken along the line AA in FIG. 3 below of the liquid cyclone according to one embodiment of the present invention.

FIG. 3 is a top view of a hydrocyclone according to one embodiment of the present invention.

FIG. 4 is a diagram in which reference numerals indicating dimensions of each part in FIG. 2 are described.

5 is a view similar to FIG. 2 except that the size of the partition wall is changed in FIG. 1;

FIG. 6 is a view similar to FIG. 2 except that the partition wall is not provided in FIG.

[Explanation of symbols]

 1 Inflow pipe 2 Middle cylindrical part 3 Conical lower part 4 Downstream pipe 5 Upstream rising pipe 6 Upper cylindrical part 7 Liquid extraction pipe 8 Diffusion wall 9 Partition wall 10 Gas vent (pipe)

Claims (1)

[Claims] 1. A liquid cyclone for separating a solid and a liquid, the liquid cyclone having a hollow conical lower part and a hollow cylindrical upper part directly connected thereto, the conical lower part being downstream. It has a pipe, and is divided into a communicating middle cylinder part and an upper cylinder part by a diffusion wall in which the cylindrical upper part is provided and an upstream rising pipe fitted therein, and the middle cylinder part flows in. A liquid discharge pipe in the upper cylindrical portion, and a partition wall having a substantially circular horizontal cross section having a highest point higher than the highest point of the liquid discharge pipe, the opening on the diffusion wall of the upstream rising pipe. And a gas vent for discharging gas generated in the liquid cyclone from the upper cylindrical portion, which is provided around the liquid ejecting pipe of the upper cylindrical portion.