WO2011113336A1

WO2011113336A1 - Crushing device for slurry particles

Info

Publication number: WO2011113336A1
Application number: PCT/CN2011/071761
Authority: WO
Inventors: 张传忠; 刘宏亮; 汪景武
Original assignee: 钦州鑫能源科技有限公司
Priority date: 2010-03-15
Filing date: 2011-03-14
Publication date: 2011-09-22
Also published as: CN102189031B; CN102189031A

Abstract

A crushing device for slurry particles includes a crushing part. The crushing part includes a gyratory ring crushing cavity (11), at least one set of nozzle assembly composed of a jet orifice (12) and a high-pressure nozzle (122), and a discharge port (13). The jet orifice (12) is arranged at the outer side wall of the crushing cavity (11), within which the high-pressure nozzle (122) is installed, and the centre line (121) of the jet orifice (12) is tangent to or intersects with the centre line (111) of the crushing cavity (11). The discharge port (13) is arranged inside the crushing cavity (11) and is communicated with the gyratory ring crushing cavity (11). The sectional areas of the gyratory ring crushing cavity (11) and the discharge port (13) are both far larger than the sum of the sectional areas of all high-pressure nozzles (122). The device can produce finer slurry particles, and increase the energy efficiency of the equipment.

Description

Slurry particle crushing device

The present invention relates to a crushing apparatus, and further to a slurry particle crushing apparatus for crushing particles in a slurry. Background technique

High-pressure homogenizers, jet mills and agitator mills are several representative ultra-fine wet crushers. The principle of the high-pressure homogenizer is to treat the material to produce strong shear and cavitation under high pressure during the process of passing through the slit of the working valve, so that the liquid substance or the solid particles supported by the liquid are ultra-fine. The disadvantages of the homogenizer are high working pressure, high energy consumption, more wearing parts, and large maintenance workload. The jet mill comprises a premixed jet pulverizer and a post-mixed jet pulverizer. The principle is that the water mixed with the material hits the target at a high speed to produce a pulverizing effect. The shortcomings of the jet mill are short crushing time, uneven crushing, and low energy utilization. The principle of the agitating mill is that the wet material mixed with or without the solid grinding medium is rotated in the mixing tank driven by the stirring shaft. Due to the different moving speeds of the various layers, the material particles and the solid grinding medium and the materials are Friction and shearing occur between the particles to achieve the purpose of crushing the material particles. The disadvantages of the agitator mill are large volume, long interaction time, and low energy utilization. Summary of the invention

The invention discloses a slurry particle crushing device, which utilizes the crushing principle of a high-pressure homogenizer, a jet mill and a stirring mill to make the particle crushing finer, the particle shape is more ideal, and the energy utilization rate of the device is higher.

The present invention relates to a slurry particle breaking device including a crushing portion. The crushing portion includes a rotary annular crushing chamber, at least one set of nozzles and discharge ports composed of an injection port and a high pressure nozzle. The injection port is located on the outer side wall of the crushing chamber, and its center line is tangent or oblique to the center line of the crushing chamber, and is installed therein to accommodate the high pressure nozzle. The discharge opening is located inside the crushing chamber and communicates with the rotary annular crushing chamber. The cross-sectional area of the rotary annular crushing chamber and the cross-sectional area of the discharge opening are both greater than the sum of the cross-sectional areas of all high-pressure nozzle combinations. The slurry obtained by pressurizing the high-pressure pump is tangentially or obliquely injected into the rotary annular crushing chamber through a high-pressure nozzle, and the material is rotated at a high speed in a turbulent flow in the crushing chamber, and the discharge is measured from the crushing chamber after being gradually decelerated. The mouth is discharged. The cross-sectional area of the rotary annular crushing chamber and the cross-sectional area of the discharge opening should be much larger than the sum of the cross-sectional areas of all the nozzles, for example, 10,000 times and 200 times, respectively, so that the pressure of the material in the crushing chamber is sufficiently low. There is enough pressure difference before and after the nozzle, and the moving speed of the material is sufficiently slowed down in the crushing chamber. When the material particles are ejected from the nozzle, strong shearing and cavitation are generated. In the crushing chamber, violent collision, rubbing and shearing occur between the material particles and the crushing chamber wall and the material particles. It is constantly broken and makes the shape of the particles tend to be spherical. When the coal-based slurry fuel is finely crushed by the device, the product particles are finer, the fluidity is better at the same concentration, and the comprehensive energy consumption is lower.

In a preferred embodiment, the nozzle combination may be 2-20 sets evenly distributed along the circumference of the outer sidewall of the crushing chamber. The cross section of the ring body of the crushing chamber may be a hanging drop shape with a long tail.

A plurality of protrusions may be disposed on the outer side wall and the top side and the bottom side wall of the crushing chamber. The height and density distribution of the protrusions may be distributed according to the direction of the outer side wall, the top side of the top side and the outer side of the bottom side wall, and the inside of the top side and the bottom side wall, which are low and sparse-high and dense-low and dense.

In addition, the present invention further discloses a crushing device for classifying and re-crushing slurry particles. The apparatus may include a grading portion communicating with the crushing portion through a discharge opening of the crushing portion located outside thereof, the grading portion including a rotary cavity, a grading sieve, a coarse material discharge passage, and a fine material discharge passage, and the grading sieve is a circular tubular shape Or a conical tubular annular screen, the discharge opening and the coarse material discharge passage of the crushing portion are located on one side of the classification sieve, and the fine material discharge passage is located on the other side of the classification sieve.

Preferably, the discharge opening and the coarse material discharge passage of the crushing portion are located inside the classification sieve, and the fine material discharge passage is located outside the classification sieve.

In addition, a power unit that drives the reciprocating vibration can be connected to the sieving screen. A water supply passage may be provided at the discharge opening of the crushing portion. A drainage port may be provided at the injection port of the crushing portion, and a circulating drainage pipe is connected to the drain discharge passage of the drainage port and the classification portion. DRAWINGS

The present invention will be further described with reference to the accompanying drawings and embodiments - Figure 1 is a perspective view showing the main structure of the slurry particle breaking device of the present invention; Figure 2 is a top perspective view of the main structure of the slurry particle breaking device of the present invention; Figure 3 is a front perspective view of the main structure of the slurry particle breaking device of the present invention; Figure 4 is a slurry particle of the present invention. A cross-sectional perspective view of the main structure of the crushing device, wherein the cavity is cut along the fold line Α-Α^Α -A ' in Fig. 2 and the front half is removed:

Figure 5 is a cross-sectional perspective view of the slurry particle breaking device in which the protrusions are provided in the crushing chamber. As seen from the front, the cavity is cut along the broken line -A' in Figure 2 and the front half is removed;

Figure 6 is a cross-sectional perspective view of the slurry particle crushing device in which the protrusions are provided in the crushing chamber, wherein the upper half is cut along the straight line B-B' in Figure 3;

Figure Ί is a cross-sectional perspective view of the slurry particle breaking device in which the classifying portion is provided, wherein the front half is cut away from the broken line -A' in Fig. 2, and the broken portion wall in front of the drain opening is removed and removed. To show the relationship between the drainage opening and the injection port;

Figure 8 is a partial enlarged view of the lower structure of Figure 7;

Figure 9 is a partial enlarged view of the upper left structure of Figure 7. detailed description

Example 1

Referring to Figure 1 6, the slurry particle breaking apparatus includes a crushing portion including a rotary annular crushing chamber 11. At least one injection port 12 is located on the outer side wall of the crushing chamber 11, and the center line 121 of the injection port 12 is tangent or oblique to the center line 111 of the crushing chamber 11. In the present embodiment, a tangential manner is employed in which the high pressure nozzle 122 is housed. Each of the injection ports 12 constitutes a set of nozzles with a high pressure nozzle 122 mounted therein. There may be a plurality of nozzle combinations of nozzles and high pressure nozzles, such as 2-20 sets, in this embodiment 6 sets, and evenly distributed along the circumference of the outer side wall of the crushing chamber 11. The crushing portion further includes a discharge opening 13 which is located inside the crushing chamber 11 and communicates with the rotary annular crushing chamber. The slewing ring is a geometry formed by rotating a cross-sectional shape about a non-intersecting axis that is in the same plane as the same, and the central axis is called the central axis of the slewing ring. The center line of the crushing chamber refers to a geometric center point of the cross section or a circumferential line formed by the approximate center point rotating along the central axis of the crushing chamber.

The crushing chamber 11 is an integral structure made of a high-strength hard material (such as a hard alloy material), and can also be lined with a high-strength material (such as nylon) that is resistant to high pressure, such as ceramics, corundum. Or synthetic diamonds). In order to enhance the crushing effect, a plurality of protrusions 112 may be provided on the outer side wall and the top side and bottom side walls of the crushing chamber 11. The height and density distribution of the protrusions 112 may be in accordance with the direction of the outer side wall, the top side of the top side and the outer side of the bottom side wall, and the inner side of the bottom side and the bottom side wall, which are low and sparse-high and dense, one low and dense. . The protrusions may be in the shape of a cone, a table or a column, or a combination of several shapes. In the present embodiment, a columnar shape is employed.

The ring body of the crushing chamber 11 may have a circular, elliptical shape, a teardrop shape with a pointed end pointing inward or a hanging drop with a long tail. This embodiment adopts this shape because the hanging drop shape with the long tail is most suitable for the working principle in which the slurry in the crushing chamber is gradually decelerated and discharged.

When the crushing device is in operation, the raw material slurry or mixture crushed to a predetermined particle size or lower is first pressurized to a pressure of 10-40 MP by a reciprocating pump, and is sprayed into the crushing chamber at a high speed through a high pressure nozzle. Strong shear, friction and cavitation are generated during the spraying to break up the solid particles supported by the liquid. The slurry that has been crushed by the initial crucible still flows in a turbulent flow in the crushing chamber at a very high speed, and the crushing action between the slurry particles and the protrusions on the side wall of the crushing chamber and the slurry particles is strong, such as impact, friction and shear. , so that the slurry particles are broken into pieces. The edges of the slurry particles are abraded in the flow so that their shape tends to be spherical, which improves the fluidity of the slurry. During the process of rotating the slurry from the outside to the inside of the crushing chamber, the kinetic energy is gradually reduced, the speed is gradually lowered, and the crushing portion is discharged through the discharge opening.

If the particle size of the slurry is not able to meet the crushing requirements after one crushing, the crushing pump is directly discharged from the discharge port of the crushing section to the crushing pump of the next stage, and the same crushing process is repeated.

Example 2

Referring to Figures 7-9, on the basis of Embodiment 1, the slurry particle crushing apparatus of Embodiment 2 further includes a classifying portion communicating with the aforementioned discharge port 13.

The grading portion includes a casing 21, a grading screen 22, a coarse material discharge passage 23, and a fines discharge passage 24. The outer casing 21 may have a cylindrical shape, a truncated cone shape or a conical shape. The grading screen 22 is a circular tubular, conical tubular or conical annular sieve having a pore diameter which is an upper limit of pulverization. The grading screen 22 can be connected to a power unit that drives its reciprocating vibration, such as a vibrator 221. The discharge opening 13 and the coarse material discharge passage 23 of the crushing portion are located on one side of the classification screen 22, and the fine material discharge passage 24 is located on the other side of the classification sieve 22. Preferably, the discharge opening 13 and the coarse material discharge passage 23 are located inside the classification screen 22, and the fine material discharge passage 24 is located outside the classification sieve 22 to avoid the discharge of small-sized high-density particles with the coarse material due to the swirling classification. Follow The ring is repeatedly broken.

The purpose of the grading portion is to make full use of the residual kinetic energy of the slurry flowing out from the discharge opening of the crushing portion, to form a swirling flow of the slurry in the rotary cavity, and to improve the grading filtration efficiency. This setup simplifies the entire pulp particle crushing process and reduces system equipment.

The coarse material discharged from the coarse material discharge passage 23 of the classification section can be mixed and crushed into the slurry before the pressure pump to be recompressed and crushed. The size of the material after one crushing can be roughly achieved, but there are still many cases where the coarse material is discharged, which is especially suitable for this process arrangement.

Example 3

Referring to Figure 7-9, on the basis of Embodiment 2, the slurry particle crushing device of Embodiment 3 is further provided with a drain port 123 at the injection port 12 of the crushing portion, and a circulation drain tube 124 is provided to communicate the drain port. 123 and the coarse material discharge passage 23 of the classification section. The coarse material enters the crushing chamber again under the suction of the injection port 12 to receive a crushing, and the discharged fine material enters a subsequent treatment process.

This crushing device with a grading portion and a draft tube is used for the case where the particle size of the slurry after the primary crushing is generally sufficient to achieve the crushing requirement and only a small amount of the crude material is discharged. This setup further simplifies the crushing process and reduces the number of system equipment.

Example 4

Referring to Figure 7, on the basis of the third embodiment, when used for crushing fine coal-based fuel, the use of a higher coal particle concentration, such as the concentration of the finished pulp, is about 70-80%, which is advantageous for improving the crushing. effectiveness. However, an excessively high concentration is disadvantageous for the classification, so in Example 4, a water supply passage 131 is provided at the discharge opening of the crushing portion. The added moisture can be removed and recycled in subsequent processes.

Claims

Rights request

A paddle particle crushing device, comprising a crushing portion, characterized in that the crushing portion comprises a rotary annular crushing chamber, at least one nozzle combination and a discharge port formed by an injection port and a high pressure nozzle, and the injection port is located The outer side wall of the crushing chamber has a center line tangential or oblique to the center line of the crushing chamber, and is installed therein to accommodate a high pressure nozzle, and the discharge opening is located inside the crushing chamber and communicates with the rotating annular crushing chamber, the turning The cross-sectional area of the annular crushing chamber and the cross-sectional area of the discharge opening are much larger than the sum of the cross-sectional areas of all the high-pressure nozzles.

2. The paddle particle breaking device according to claim 1, wherein said nozzle combination is

2-20 sets, evenly distributed along the circumference of the outer wall of the crushing chamber.

3. The slurry particle disrupting apparatus according to claim 1, wherein the ring body of the crushing chamber has a long-tailed hanging drop shape.

4. The slurry particle disrupting apparatus according to claim 1, wherein a plurality of protrusions are provided on the outer side wall and the top side and the bottom side wall of the crushing chamber.

5. The slurry particle crushing apparatus according to claim 4, wherein the protrusions have a height and a density distribution according to the outer side walls, the top side and the outer side of the bottom side wall, and a top side and a bottom side wall. Direction, low and sparse one-to-one high and dense one-to-one low and dense regular distribution.

6. The slurry particle crushing apparatus according to claim 1, further comprising a classifying portion, wherein said classifying portion communicates with the crushing portion through a discharge opening of the crushing portion located outside thereof; said classifying The part comprises a rotary cavity, a grading sieve, a coarse material discharge passage and a fine material discharge passage; the grading sieve is a circular tubular or a cone-shaped annular sieve; the discharge opening and the coarse material discharge passage of the crushing portion are located at one side of the grading sieve The fine material discharge passage is located on the other side of the grading screen.

7. The slurry particle crushing apparatus according to claim 6, wherein the discharge opening and the coarse material discharge passage of the crushing portion are located inside the classification sieve, and the fine material discharge passage is located outside the classification sieve.

8. The slurry particle disrupting apparatus according to claim 6, wherein said grading screen is connected to a power unit for driving the reciprocating vibration thereof.

9. The slurry particle crushing apparatus according to claim 6, wherein the water discharge passage is provided at the discharge opening of the crushing portion.

10. The slurry particle crushing apparatus according to claim 6, wherein a discharge port is provided at an injection port of the crushing portion, and a circulating drain pipe is provided to communicate the drain passage of the drain port and the classifying portion.