CN215612403U - Cyclone separator and polyolefin catalyst production device - Google Patents

Abstract

The utility model relates to the technical field of cyclone separators, and discloses a cyclone separator and a polyolefin catalyst production device. The cyclone separator comprises an outer pipe (10) and an exhaust pipe (20), wherein a top plate is arranged at the upper end of the outer pipe (10), the exhaust pipe (20) penetrates through the top plate, and the exhaust pipe (20) can stretch and retract to adjust the distance between the lower end of the exhaust pipe (20) and the upper end of the outer pipe (10). Through the technical scheme, the length of the lower end of the exhaust pipe extending into the cyclone separator can be changed by utilizing the telescopic exhaust pipe, so that the particle size distribution of the catalyst in the cyclone separator can be regulated and controlled under the condition that the cyclone separator is not replaced.

Description

Cyclone separator and polyolefin catalyst production device

Technical Field

The utility model relates to the technical field of cyclone separators, in particular to a cyclone separator and a polyolefin catalyst production device.

Background

The cyclone separator is an important production device in the field of chemical production, is mainly used for gas-solid separation, and is widely used due to the advantages of simple structure, no running part and the like. Since the advent of the ziegler-natta catalyst in the 50 s, the development performance of the ziegler-natta catalyst has been greatly improved through continuous research, and the ziegler-natta catalyst has become a mainstream catalyst used in the polyolefin industry. Polyolefin catalyst production general procedure: dissolving magnesium chloride and the like as a carrier, reacting at a certain temperature, adding titanium, keeping constant temperature and the like to prepare a catalyst master batch, and carrying out processes of spray drying, cyclone separation and the like on the master batch to obtain the catalyst with specific morphology and particle size distribution. Because olefin has a template effect on the catalyst in the polymerization process, namely the particle size distribution of the catalyst directly influences the particle size distribution of a polymerization product, and is particularly not beneficial to industrial production of polyolefin when the content of catalyst fine powder is high, the content of the catalyst fine powder needs to be controlled in the production process of the catalyst, so that a cyclone separator needs to have a good separation effect to remove part of the catalyst fine powder. Meanwhile, the polyolefin catalyst is divided into different grades according to different purposes and device process characteristics and different particle size distribution of the catalyst, so that the cyclone separator is required to have good applicability to the catalysts with different grades and different particle size distribution.

In order to effectively control the particle size of the catalyst in the production process of the polyolefin catalyst, the influencing factors of the catalyst particle forming process, such as the feeding amount of a peristaltic pump, the type and the rotating speed of an atomizing wheel, the structure and the size of a drying chamber, the circulating air quantity, the drying temperature and the like, need to be controlled so as to ensure that the particle size distribution of the prepared catalyst is within a target range. In addition, after catalyst particles come out of the drying chamber along with the airflow and enter the cyclone separator, gas-solid separation is realized through the cyclone separator, and secondary regulation and control on the particle size distribution of the catalyst can also be realized according to different removal degrees of catalyst fine powder and ultrafine powder by the cyclone separator. On a determined industrial production device, the structures, the sizes, the inner components and the like of an inlet, a straight cylinder section and a conical section of the cyclone separator are not optimized and adjusted, so that the interlocking change of other equipment is avoided, but the optimization of the gas-solid separation process can be realized by adjusting the length of the exhaust pipe. Therefore, a cyclone separator which has a constant shape and can realize the regulation and control of the particle size distribution of the catalyst is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the technical problems and provide a cyclone separator to realize the regulation and control of the particle size distribution of a catalyst without replacing the cyclone separator.

In order to achieve the above object, an aspect of the present invention provides a cyclone separator including an outer tube having a top plate at an upper end thereof and an exhaust pipe penetrating the top plate, the exhaust pipe being retractable to adjust a distance between a lower end of the exhaust pipe and the upper end of the outer tube.

Optionally, at least a portion of the exhaust tube is a collapsible tube.

Optionally, the exhaust pipe includes an upper pipe and a lower pipe, the lower pipe is sleeved on a lower end of the upper pipe, and a length of a portion where the lower pipe and the upper pipe overlap each other is adjustable.

Optionally, the upper pipe and the lower pipe are connected through threads.

Optionally, an upper flange is arranged at the top of the exhaust pipe.

Optionally, the outer tube comprises a straight tube section and a cone section connected to a lower end of the straight tube section.

Optionally, the straight barrel section is provided with a cyclone inlet.

Optionally, a collecting hopper is connected to the lower end of the cone section.

Optionally, a discharge port is arranged at the bottom of the aggregate bin, and a lower flange is arranged at the discharge port.

The second aspect of the present invention provides a polyolefin catalyst production apparatus comprising the cyclone described above.

Through the technical scheme, the length of the lower end of the exhaust pipe extending into the cyclone separator can be changed by utilizing the telescopic exhaust pipe, so that the particle size distribution of the catalyst in the cyclone separator can be regulated and controlled under the condition that the cyclone separator is not replaced.

Drawings

FIG. 1 is a schematic structural view of one embodiment of the cyclone separator of the present invention.

Description of the reference numerals

10-outer tube, 11-straight tube section, 12-cone section, 20-exhaust tube, 21-upper tube, 22-foldable tube, 23-lower tube, 30-cyclone inlet, 40-aggregate bin, 50-upper flange and 60-lower flange.

Detailed Description

The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, where nothing is said to the contrary, the use of directional words such as "upper" and "lower" generally refers to the relative positions of the cyclone in use. It should be noted that this is only for the convenience of describing the present invention and should not be construed as limiting the present invention.

The cyclone separator includes an outer tube 10 and an exhaust tube 20, a top plate is disposed at an upper end of the outer tube 10, the exhaust tube 20 penetrates the top plate, and the exhaust tube 20 is capable of extending and contracting to adjust a distance between a lower end of the exhaust tube 20 and an upper end of the outer tube 10.

The outer tube 10 is a substantially circular tube into which the exhaust pipe 20 is inserted from the upper end of the outer tube 10, and the exhaust pipe 20 and the upper end of the outer tube 10 are sealed by a top plate having a ring shape to allow the exhaust pipe 20 to pass therethrough; the exhaust pipe 20 is of a telescopic structure, and the lower end thereof can be moved in the length direction with respect to the upper end of the outer pipe 10 while the upper end thereof is kept stationary with respect to the exhaust pipe 20, to adjust the distance between the lower end of the exhaust pipe 20 and the upper end of the outer pipe 10, i.e., the length inserted into the outer pipe 10.

In the technical scheme, the length of the lower end of the exhaust pipe 20 extending into the cyclone separator is changed by utilizing the telescopic exhaust pipe 20, so that the fine-particle catalyst below a selected size can be discharged through the exhaust pipe 20 under the condition that the cyclone separator and associated equipment are not replaced, and the particle size distribution of the catalyst in the cyclone separator is regulated.

In the using process, catalyst particles and airflow flow into the cyclone separator along the tangential direction of the cyclone separator, the airflow spirally enters the cyclone cylinder along the cylinder, coarse catalyst particles are thrown to the wall of the cylinder under the action of centrifugal force, the catalyst particles lose inertia force when colliding and fall along the cylinder wall to flow out of a dust discharge port of the cyclone pipe to the bottom of the equipment, the rotating airflow drives fine catalyst particles to contract in the cylinder to flow towards the center, the particles with small particle sizes are gathered towards the center of the cylinder along with the fine catalyst particles, and secondary vortexes are formed upwards and flow out of the cyclone separator through the exhaust pipe 20.

Through a lot of research and production experiments, it is found that the length of the exhaust pipe 20 extending into the outer pipe 10 affects the particle size distribution of the solid particles discharged from the exhaust pipe 20, and thus the separation efficiency and the minimum separation particle size can be controlled by adjusting the length of the exhaust pipe 20.

In the cyclone, the diameter of the exhaust duct 20 may be set to 0.4 to 0.5 times the diameter of the outer duct 10.

As an alternative embodiment, referring to fig. 1, at least a portion of the exhaust pipe 20 is a foldable pipe. The length of the exhaust pipe 20 is adjusted by the foldable pipe. The collapsible tube may comprise various embodiments, such as a bellows that is collapsible and retractable or two tube sections that are telescoped together.

According to another specific embodiment, referring to fig. 1, the exhaust pipe 20 includes an upper pipe 21 and a lower pipe 23, the lower pipe 23 is sleeved on a lower end of the upper pipe 21, and a length of a portion where the lower pipe 23 and the upper pipe 21 overlap each other is adjustable. Specifically, the length of the overlapping portion of the lower tube 23 and the upper tube 21 may be adjustable in various ways, for example, a slide may be provided on the overlapping portion of the upper tube 21, the slide may be provided with a plurality of connected horizontal sections from bottom to top in the vertical direction, a matching slide block capable of sliding in the slide is provided on the lower tube 23, and the length of the overlapping portion of the lower tube 23 and the upper tube 21 may be adjustable by sliding the lower tube 23 to the slide block of the horizontal section with different heights. In another embodiment, the lower pipe 23 may have a controllable clamping device, by which the lower pipe 23 is fixed at a certain height relative to the upper pipe 21, and further, the outer wall of the upper pipe 21 may have a groove or a protrusion structure matched with the clamping device, so that the clamping device can more firmly fix the lower pipe 23 at a certain height of the upper pipe 21.

The upper tube 21 and the lower tube 23 may be connected to each other by a screw. Referring to fig. 1, the overlapped portion between the upper tube 21 and the lower tube 23 can be regarded as a foldable tube 22, the length of the foldable tube 22 can be set according to the actual size of the cyclone separator and the adjustment requirement, the outer wall of the upper tube 21 can have an external thread, the inner wall of the upper end of the lower tube 23 can have an internal thread matching with the external thread of the upper tube 21, which can adopt common thread fit, in order to have better sealing performance between the upper tube 21 and the lower tube 23, enable the exhaust tube 20 to work normally, and prevent the ultrafine catalyst particles from entering into the gap between the connection positions of the upper tube 21 and the lower tube 23 to cause the abrasion of the connection surface and the difficulty of adjustment, and a sealing thread connection can be adopted between the upper tube 21 and the lower tube 23.

In order to facilitate the connection of the cyclone separator provided in the present application to its associated accessories, an upper flange 50 is provided on the top of the discharge duct 20, as shown in fig. 1. The exhaust pipe 20 can be more conveniently connected with other equipment or pipelines through the upper flange 50, a sealing structure can be arranged on the upper flange 50 to enhance the sealing capability of the joint, and the sealing structure can be a groove capable of being provided with a sealing ring or other end face sealing structures.

In order to improve the working efficiency of the cyclone separator and reduce the attrition rate, referring to fig. 1, the outer tube 10 may include a straight cylindrical section 11 and a cone section 12 connected to the lower end of the straight cylindrical section 11. In particular, the length and diameter of the straight cylinder segment 11 and the vertebral body segment 12 can be set according to requirements.

As a specific embodiment, referring to fig. 1, the straight cylinder section 11 is provided with a cyclone inlet 30. The cyclone inlet 30 may be disposed along a tangent line of an outer sidewall of an upper end of the straight cylinder section 11, and catalyst powder to be separated is introduced into the cyclone through the cyclone inlet 30 along with an air flow. Still further, the lower end of the exhaust duct 20 may be positioned below the bottom of the cyclone inlet 30 to prevent short circuiting of the airflow, but should not be close to the upper edge of the cone section 12.

In order to facilitate the recovery of the separated coarse catalyst powder, a collection hopper 40 may be connected to the lower end of the cone section 12, as shown in fig. 1. The size and structure of the collection hopper 40 have a direct influence on the separation efficiency of the cyclone, and the diameter of the collection hopper 40 may be set to 1 to 1.2 times the diameter of the exhaust duct 20.

Since the material collecting hopper 40 is located at a position where the negative pressure is large, in order to ensure the sealing performance at the material collecting hopper 40, the cyclone separator may further be equipped with an air locking device, and the air locking device may have various embodiments, such as a gravity-actuated dust discharging valve, a mechanical transmission rotary dust discharging valve, an electric dust discharging valve, and the like.

In addition, referring to fig. 1, the bottom of the collecting hopper 40 is provided with a discharge port, and the discharge port is provided with a lower flange 60. The discharge port can guide the coarse-grained catalyst powder collected and accumulated in the collecting hopper 40 to subsequent treatment equipment or collection equipment, and the lower flange 60 can more conveniently connect the collecting hopper 40 with the subsequent treatment equipment or pipelines.

The second aspect of the present invention provides a polyolefin catalyst production apparatus comprising the cyclone described above. The polyolefin catalyst production device can also comprise an atomizer, a drying chamber, a feeding peristaltic pump, a cloth bag filter, a condenser, a switch valve, a circulating fan, a hot oil exchanger, a fan and the like.

In order to effectively control the particle size of the catalyst in the production process of the polyolefin catalyst, the influencing factors of the catalyst particle forming process, such as the feeding amount of a peristaltic pump, the type and the rotating speed of an atomizing wheel, the structure and the size of a drying chamber, the circulating air quantity, the drying temperature and the like, need to be controlled so as to ensure that the particle size distribution of the prepared catalyst is within a target range. Usually, unseparated catalyst particles can come out from the drying chamber along with the airflow and enter the cyclone separator provided by the technical scheme, then gas-solid separation is realized through the cyclone separator, and secondary regulation and control on the particle size distribution of the catalyst can be realized according to different removal degrees of catalyst fine powder and ultrafine powder by the cyclone separator. However, on a certain industrial production device, the inlet and outlet positions of the cyclone separator, the structure of the outer pipe 10, the internal components and the like are not optimized and adjusted generally, so as to avoid interlocking change of other equipment, but the polyolefin catalyst is divided into different brands according to different particle size distributions of the catalyst according to different purposes and device process characteristics, so that the polyolefin catalyst production device utilizing the cyclone separator in the technical scheme can realize optimization and adjustment of a gas-solid separation process by adjusting the length of the exhaust pipe 20, and thus the device has good applicability to catalysts of different brands and different particle size distributions.

Examples

When a certain grade of polyolefin catalyst is produced, the circulating air quantity A +/-10 kg/h of the spray drying system is controlled, other production conditions are kept unchanged, and secondary regulation and control on the particle size are realized by regulating the length of the exhaust pipe 20.

Refer to Table 1

TABLE 1 Effect of different exhaust pipe lengths on catalyst particle size distribution

As can be seen from table 1, under the condition that other production conditions are not changed, after the exhaust pipe 20 of the cyclone is adjusted from a short air pipe (L ═ 245mm) to a long air pipe (L ═ 265mm), the catalyst particle size D (0.1) is increased from 6.0 μm to 7.5 μm, the amount of the fine powder collected by each batch of cyclones is increased from 2.9kg to 12.2kg, and the minimum cut particle size of the cyclone is increased by adjusting the exhaust pipe 20, so that the effect of removing small particles in the catalyst product is achieved, the catalyst particle size is more concentrated, and the application of the catalyst to downstream manufacturers is facilitated.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the utility model, numerous simple variants can be made to the technical solution of the utility model, and the individual specific technical features can be combined in any suitable way. The utility model is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims (10)

1. The cyclone separator is characterized by comprising an outer pipe (10) and an exhaust pipe (20), wherein a top plate is arranged at the upper end of the outer pipe (10), the exhaust pipe (20) penetrates through the top plate, and the exhaust pipe (20) can stretch and retract to adjust the distance between the lower end of the exhaust pipe (20) and the upper end of the outer pipe (10).

2. Cyclone separator according to claim 1, characterized in that at least a part of the exhaust duct (20) is a collapsible duct.

3. The cyclone separator as claimed in claim 1, wherein the discharge duct (20) comprises an upper duct (21) and a lower duct (23), the lower duct (23) being fitted over a lower end of the upper duct (21), a length of a portion where the lower duct (23) and the upper duct (21) overlap each other being adjustable.

4. Cyclone separator according to claim 3, characterized in that the upper tube (21) and the lower tube (23) are connected by a screw thread.

5. Cyclone separator according to claim 1, characterized in that the top of the discharge duct (20) is provided with an upper flange (50).

6. Cyclone separator according to claim 1, characterized in that the outer tube (10) comprises a straight cylindrical section (11) and a cone section (12) connected to the lower end of the straight cylindrical section (11).

7. Cyclone separator according to claim 6, characterized in that the straight cylindrical section (11) is provided with a cyclone inlet (30).

8. Cyclone separator according to claim 6, characterized in that a collection hopper (40) is connected to the lower end of the cone segment (12).

9. Cyclone separator according to claim 8, characterized in that the collecting hopper (40) is provided with a discharge opening at its bottom, said discharge opening being provided with a lower flange (60).

10. A polyolefin catalyst production apparatus characterized by comprising the cyclone separator of any one of claims 1 to 9.

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