Cyclone bag type composite separator and method suitable for cement powder unloading device

Abstract

The present invention discloses a cyclone bag type composite separator and method suitable for cement powder unloading device. In the cyclone bag type composite separator, the upper end of the inner cylinder is a bell mouth and is connected to the outer cylinder, the pleated filter bag is arranged in the inner cylinder, the flower plate is arranged in the inner cylinder, the pleated filter bag penetrates the flower plate and is connected to the flower plate, the outer cylinder is provided with an inlet pipe and an outlet pipe, the inlet pipe is located below the bell mouth of the inner cylinder, the outlet pipe is located above the bell mouth of the inner cylinder, the lower end of the outer cylinder is connected with an ash hopper, and the ash hopper is provided with a discharge port. The present invention is suitable for the cyclone bag type composite separator of the cement powder unloading device. The outer cylinder and the inner cylinder are the structure of a conventional cyclone separator, which can efficiently separate large-size particles and reduce high-concentration materials to lower concentrations; the pleated filter bag is arranged in the inner cylinder to give full play to its advantage of efficiently processing fine-size particles, so that the present invention can have a good collection effect on fine particles below 10μm and meet environmental protection requirements.

Description

Technical Field

[0001] The invention belongs to the field of pneumatic conveying, and in particular relates to a cyclone bag type composite separator suitable for a cement powder ship unloading device and a method. Background Art

[0002] The port unloading methods are divided into screw unloaders and pneumatic unloaders, among which the pneumatic unloader is composed of an air suction system and various working mechanisms and frames installed to enable the suction nozzle to flexibly absorb materials. It is an unloading machine that uses the negative pressure flow formed by the fan in the pipeline to suck and unload bulk materials from the cabin. The pneumatic unloader has the advantages of simple structure, low cost, convenient operation, good working conditions for workers, easy to realize automatic control and management, strong adaptability to various ships, and small amount of cabin cleaning, and is widely used for powdered materials. The principle of the pneumatic conveying system of the pneumatic unloader is to generate negative pressure in the high-efficiency separator and the hydraulic suction arm through the Roots vacuum pump to form a certain vacuum degree, and suck the powder from the cabin into the high-efficiency separator through the suction nozzle. The powder is separated in the high-efficiency separator, and the separated materials fall into the pneumatic conveying device below the separator, and are transported to the storage tank through the pneumatic conveying device and pipeline. Pneumatic conveying systems often use cyclone separators as separation equipment. However, as environmental protection requirements become increasingly stringent, fine particles below 10μm need to be collected. Since cyclone separators have low collection efficiency for fine particles below 10μm, existing separators are difficult to meet environmental emission requirements. Therefore, there is an urgent need for a separator that can have a good collection effect on fine particles below 10μm. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a cyclone bag type composite separator and method suitable for a cement powder unloading device. The cyclone bag type composite separator of the present invention has a good collection effect on fine particles below 10μm and meets environmental protection requirements.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0005] A cyclone bag composite separator suitable for cement powder unloading device comprises an outer cylinder, an inner cylinder, a pleated filter bag and a flower plate, wherein the inner cylinder is arranged in the outer cylinder, the upper end of the inner cylinder is a bell mouth and is connected to the outer cylinder, the pleated filter bag is arranged in the inner cylinder, the flower plate is arranged in the inner cylinder, the pleated filter bag passes through the flower plate and is connected to the flower plate, an inlet pipe and an air outlet pipe are arranged on the outer cylinder, the inlet pipe is located below the bell mouth of the inner cylinder, the air outlet pipe is located above the bell mouth of the inner cylinder, the lower end of the outer cylinder is connected to an ash hopper, and the ash hopper is provided with a discharge port.

[0006] Preferably, a plurality of pleated filter bags are provided, and the plurality of pleated filter bags are arranged in a row spraying manner.

[0007] Preferably, the number and size of the pleated filter bags satisfy the following relationship:

[0008]

[0009] Where D is the diameter of the cylindrical section of the inner tube, n is the number of pleated filter bags, d is the diameter of the pleated filter bags, and a is the safety margin.

[0010] Preferably, the diameter of the pleated filter bag Among them, f gl is the total filtration area of ​​the pleated filter bag, l is the length of the pleated filter bag, and x is the air permeability ratio of the pleated filter bag.

[0011] Preferably, the air permeability ratio of the pleated filter bag is 6 to 8, and the length of the pleated filter bag is 0.7 to 0.8 times the length of the inner tube.

[0012] Preferably, the safety margin is 0.6-0.7.

[0013] Preferably, the inlet pipe includes a tangential pipe and an inclined pipe, the tangential pipe is tangent to the outer cylinder, the inclined pipe is located in the annular cavity between the outer cylinder and the inner cylinder, one end of the inclined pipe is connected to the tangential pipe; the other end of the inclined pipe is inclined toward the inlet direction of the inner cylinder, and the distance between this end of the inclined pipe and the inlet end of the inner cylinder is 0.2-0.3 times the length of the inner cylinder.

[0014] Preferably, both the tangential tube and the inclined tube are round tubes, and the outlet end of the inclined tube is configured as an oblique opening, with the opening of the oblique opening facing upward.

[0015] Preferably, the upper end of the outer cylinder is set as an arc-shaped top, and a row blowing device is provided on the arc-shaped top. The upper end of the pleated filter bag is connected to the row blowing device, and the lower end of the pleated filter bag extends toward the lower end of the inner cylinder. The air outlet of the pleated filter bag is located above the flower plate, and the flower plate is installed at the upper end of the bell mouth of the inner cylinder.

[0016] The present invention also provides a separation method applicable to a cement powder unloading device, the separation method adopts the cyclone bag type composite separator as described above, and comprises the following process:

[0017] The material is blown from the mouth pipe into the annular chamber between the outer cylinder and the inner cylinder to make the material do vortex motion. During the vortex motion of the material, part of the material falls into the ash hopper, and the other part of the material is filtered by the pleated filter bag, and the gas in the material is discharged from the outlet pipe.

[0018] The present invention has the following technical effects:

[0019] The outer cylinder and inner cylinder of the cyclone bag composite separator suitable for cement powder unloading device of the present invention are structures of conventional cyclone separators, which can efficiently separate large-size particles and reduce high-concentration materials to lower concentrations; the pleated filter bag arranged in the inner cylinder can give full play to its advantage of efficiently processing fine-size particles, so that the present invention can have a good collection effect on fine particles below 10μm and meet environmental protection requirements; the use of pleated filter bags can improve the separation efficiency of the separator without increasing the volume and floor space of the existing separator, thereby achieving the effect of miniaturization of the separator.

[0020] Furthermore, the inlet pipe of the present invention includes a tangential pipe and an inclined pipe, the tangential pipe is tangent to the outer cylinder, the inclined pipe is located in the annular cavity between the outer cylinder and the inner cylinder, one end of the inclined pipe is connected to the tangential pipe; the other end of the inclined pipe is inclined toward the inlet direction of the inner cylinder, and the distance between the end of the inclined pipe and the inlet end of the inner cylinder is 0.2-0.3 times the length of the inner cylinder. The inlet pipe is set as the above-mentioned structural form so that the internal flow field of the cyclone bag composite separator of the present invention is evenly distributed, no obvious vortex is generated, which is conducive to long-term normal operation and durability.

[0021] Furthermore, since the cyclone bag composite separator of the present invention is applied to the pneumatic conveying system for port unloading, and the pneumatic conveying system uses a round tube for conveying, and the inlet pipe of the conventional cyclone separator is generally rectangular, a connecting piece with a round shape and a square shape is required to connect it to the round tube, which will produce a large local pressure loss. In order to avoid this pressure loss, the inlet pipe of the present invention is set as a round tube. The outlet end of the inclined tube is set as an oblique mouth, and the opening of the oblique mouth faces upward, which further proves that the internal flow field of the cyclone bag composite separator of the present invention is evenly distributed and does not produce obvious vortices. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a cyclone bag type composite separator suitable for cement powder ship unloading equipment;

[0023] Figure 2 Schematic diagram of the arrangement of pleated filter bags in a row spraying manner in an embodiment of the present invention;

[0024] Figure 3 is a particle trajectory diagram in an embodiment of the present invention;

[0025] Figure 4 is a streamline diagram in an embodiment of the present invention;

[0026] In the figure, 1-inlet pipe, 1-1-tangential pipe, 1-2-inclined pipe, 2-first flange, 3-row blowing device, 4-pleated filter bag, 5-inner cylinder, 6-air outlet pipe, 7-second flange, 8-flower plate, 9-outer cylinder, 10-ash hopper, 11-discharge port. DETAILED DESCRIPTION

[0027] The specific contents of the present invention are further explained in detail below in conjunction with the accompanying drawings and embodiments.

[0028] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0029] Reference Figure 1 The present invention is applicable to a cyclone bag composite separator of a cement powder unloading device, comprising an outer cylinder 9, an inner cylinder 5, a pleated filter bag 4 and a flower plate 8. The inner cylinder 5 is arranged in the outer cylinder 9, the upper end of the inner cylinder 5 is a bell mouth and is connected to the outer cylinder 9, the pleated filter bag 4 is arranged in the inner cylinder 5, the flower plate 8 is arranged in the inner cylinder 5, the pleated filter bag 4 passes through the flower plate 8 and is connected to the flower plate 8, an inlet pipe 1 and an air outlet pipe 6 are provided on the outer cylinder 9, the inlet pipe 1 is located below the bell mouth of the inner cylinder 5, the air outlet pipe 6 is located above the bell mouth of the inner cylinder 5, the lower end of the outer cylinder 9 is connected to an ash hopper 10, and the ash hopper 10 is provided with a discharge port 11.

[0030] As a preferred embodiment of the present invention, refer to Figure 1 and Figure 2 A plurality of pleated filter bags 4 are provided, and the plurality of pleated filter bags 4 are arranged in a row spraying manner.

[0031] As a preferred embodiment of the present invention, the number and size of the pleated filter bags 4 satisfy the following relationship:

[0032]

[0033] Where D is the diameter of the cylindrical section of the inner tube, n is the number of pleated filter bags, d is the diameter of the pleated filter bags, and a is the safety margin.

[0034] As a preferred embodiment of the present invention, the diameter of the pleated filter bag is Among them, f gl is the total filtration area of ​​the pleated filter bag, l is the length of the pleated filter bag, and x is the air permeability ratio of the pleated filter bag.

[0035] As a preferred embodiment of the present invention, the air permeability ratio of the pleated filter bag is 6 to 8, and the length of the pleated filter bag is 0.7 to 0.8 times the length of the inner tube.

[0036] As a preferred embodiment of the present invention, the safety margin is 0.6-0.7.

[0037] As a preferred embodiment of the present invention, refer to Figure 1 , Figure 3 and Figure 4The inlet pipe 1 includes a tangential pipe 1-1 and an inclined pipe 1-2. The tangential pipe 1-1 is tangent to the outer cylinder 9. The inclined pipe 1-2 is located in the annular cavity between the outer cylinder 9 and the inner cylinder 5. One end of the inclined pipe 1-2 is connected to the tangential pipe 1-1; the other end of the inclined pipe 1-2 is inclined toward the inlet direction of the inner cylinder 5, and the distance between this end of the inclined pipe 1-2 and the inlet end of the inner cylinder 5 is 0.2-0.3 times the length of the inner cylinder 5.

[0038] As a preferred embodiment of the present invention, the tangential tube 1-1 and the inclined tube 1-2 are both round tubes, and the outlet end of the inclined tube 1-2 is set as an oblique opening, with the opening of the oblique opening facing upward.

[0039] As a preferred embodiment of the present invention, refer to Figure 1 The upper end of the outer cylinder 9 is set as an arc-shaped top, and a row blowing device 3 is provided on the arc-shaped top. The upper end of the pleated filter bag 4 is connected to the row blowing device 3, and the lower end of the pleated filter bag 4 extends toward the lower end of the inner cylinder 5. The air outlet of the pleated filter bag 4 is located above the flower plate 8, and the flower plate 8 is installed at the upper end of the bell mouth of the inner cylinder 5.

[0040] The present invention also provides a separation method suitable for a cement powder unloading device, the separation method adopts the cyclone bag type composite separator as described above, and comprises the following process:

[0041] The material is blown from the mouth pipe 1 into the annular chamber between the outer cylinder 9 and the inner cylinder 5 to make the material do vortex motion. During the vortex motion of the material, part of the material falls into the ash hopper 10, and the other part of the material is filtered by the pleated filter bag 4, and the gas in the material is discharged from the air outlet pipe 6.

[0042] Example

[0043] The present embodiment is applicable to a cyclone bag type composite separator of a cement powder unloading device, comprising an outer cylinder 9, an inner cylinder 5, a pleated filter bag 4 and a flower plate 8, wherein the inner cylinder 5 is arranged in the outer cylinder 9, the upper end of the inner cylinder 5 is a bell mouth and connected to the outer cylinder 9, the pleated filter bag 4 is arranged in the inner cylinder 5, the flower plate 8 is arranged in the inner cylinder 5, the pleated filter bag 4 penetrates the flower plate 8 and is connected to the flower plate 8, the outer cylinder 9 is provided with an inlet pipe 1 and an outlet pipe 6, the inlet pipe 1 and the outlet pipe 6 are respectively located on opposite sides of the outer cylinder 9, the inlet pipe 1 is located below the bell mouth of the inner cylinder 5, the outlet pipe 6 is located above the bell mouth of the inner cylinder 5, the lower end of the outer cylinder 9 is connected with an ash hopper 10, the ash hopper 10 is provided with a discharge port 11, the ash hopper 10 adopts a conical ash hopper, and the discharge port 11 is arranged at the bottom of the conical ash hopper. Among them, 48 pleated filter bags 4 are provided, and the 48 pleated filter bags 4 are arranged in a row spraying manner. The flower plate 8 is installed at the upper end of the bell mouth of the inner cylinder 5. On the one hand, the flower plate 8 can install and limit all the pleated filter bags 4, and can also make the gas with tiny particles in the inner cylinder 5 pass only through the pleated filter bags 4, so as to remove the tiny particles. The outer cylinder 9 has a cylindrical body and an arc-shaped top. The arc-shaped top has the function of stabilizing and dispersing the airflow, and preventing the airflow from backblowing the pleated filter bags. The inner cylinder 5 includes a cylindrical section and a bell mouth, and the cylindrical section and the bell mouth are connected. The inner cylinder 5 is coaxially arranged with the outer cylinder 9, and the bell mouth and the outer cylinder 9 are sealed. The annular chamber between the inner cylinder 5 and the outer cylinder 9 is called an annular separation chamber. A row blowing device 3 is provided on the arc-shaped top, and the upper ends of all the pleated filter bags 4 are connected to the row blowing device 3, and the lower end of the pleated filter bag 4 extends toward the lower end of the inner cylinder 5. The inlet pipe 1 includes a tangential pipe 1-1 and an inclined pipe 1-2. The tangential pipe 1-1 is tangent to the outer cylinder 9. The inclined pipe 1-2 is located in the annular cavity between the outer cylinder 9 and the inner cylinder 5. One end of the inclined pipe 1-2 is connected to the tangential pipe 1-1. The other end of the inclined pipe 1-2 is inclined toward the inlet direction of the inner cylinder 5. The distance between the end of the inclined pipe 1-2 and the inlet end of the inner cylinder 5 is 810 mm. Both the tangential pipe 1-1 and the inclined pipe 1-2 are round pipes. The inner cylinder 5 is made of wear-resistant material. Each pleated filter bag 4 has a bag cage as a support and link to connect with the flower plate. Put the protective cover into the hole of the flower plate. The cover fabric must surround the edge of the flower plate. After taking out the cover, bend the elastic ring of the filter bag with both hands, align the groove of the outer bag mouth with the edge of the flower plate, make uniform contact and gradually put it back. If it cannot be close to the flower plate, you can use a rubber hammer to gently tap the periphery until it is tight. After installation, check whether the groove of the filter bag mouth is tight. The number of filter bags, the specific size and parameters of the filter bags are determined. Set the pleat air permeability ratio x to 6, the pleated filter bag length l to 2 meters, and the filter bag diameter d is 80mm, where n is 48. The number of filter bags n and the air permeability ratio x are related to the cylinder diameter. The cylinder is required to be able to accommodate enough filter bags. The judgment basis is D is 3.5m, of which 0.7 is a safety margin; the filter bag must be installed under fire-prohibited conditions, installed straight, the bag opening must be sealed without gaps, the plate holes, the contact surfaces of the bag cage and the filter bag must be smooth and free of burrs, and the levelness of the upper end of the filter bag inlet duct must not exceed 1mm.

[0044] The material enters the annular separation chamber obliquely from the inlet pipe and performs vortex motion under the action of centrifugal force. Large particles are separated into the conical ash hopper, and small particles continue to perform vortex motion and reach the filter bag chamber and are captured by 48 pleated filter bags on the surface of the filter bags. The clean airflow is discharged to the air outlet through the pleated filter bag outlet.

[0045] In order to verify the collection capacity of the cyclone bag composite separator of this embodiment for small-size particles and analyze the uniformity inside the separator, a simplified calculation model of the filter bag plus bell-mouth inner cylinder side feed separator is established for the convenience of calculation; in this embodiment, 48 pleated filter bags are arranged in the middle of the filter bag chamber in a row-spraying manner, and the arrangement is detailed in Figure 1 and Figure 2 , six rows of filter bags are arranged, 8 filter bags in one row, totaling 48 filter bags. The distances from the 1st row to the 2nd row, the 2nd row to the 3rd row, the 4th row to the 5th row, and the 5th row to the 6th row are equal. The center distance from the front row filter bag to the center distance from the rear row filter bag is 240mm. The distance from the 3rd row to the 4th row is slightly larger than the distance between the above rows. The center distance from the 3rd row to the 4th row filter bag is 270mm. The distance between each row of filter bags is equal, all 195mm. The filter bag outlet is flush with the flower plate, and a blowing device is set on the flower plate. The filter bag has a diameter of 160mm and a length of 2m.

[0046] In order to analyze the uniformity of the flow field inside the separator, the streamline diagram of the separator and the airflow uniformity judgment index are obtained. The airflow uniformity judgment index adopts the flow distribution coefficient K qi , maximum flow unevenness amplitude ΔK qi , the magnitude of the comprehensive flow unevenness And ΔK qi , The smaller the value, the more uniform the airflow. The calculation formula is as follows:

[0047]

[0048] ΔK qi =K qi max -K qi min

[0049]

[0050] i-Filter bag number

[0051] v- each filter bag handles air volume m 3 / h

[0052] - Average wind speed at filter bag outlet m 3 / h

[0053] According to the particle size distribution of cement particles, the following particle settings are made. The fluid in the separator is regarded as an incompressible fluid. The Standard model in the κ-ε two-equation model in the Fluent software is selected and the SIMPLE algorithm is used for solving. The boundary conditions are set as follows: inlet flow rate 30.7m / s, outlet negative pressure -5000Pa, and the results are as follows:

[0054] Particle size 30μm, inlet release 458 particles, outlet escape 0, separation efficiency 100%

[0055] Particle size 20μm, inlet release 458 particles, outlet escape 0, separation efficiency 100%

[0056] Particle size 16μm, 458 particles released at the inlet, 17 escaped at the outlet, separation efficiency 100%

[0057] Particle size 15μm, 458 particles released at the inlet, 43 escaped at the outlet, separation efficiency 100%

[0058] Particle size 10μm, inlet release 458 particles, outlet escape 0, separation efficiency 100%

[0059] Particle size 5μm, inlet release 458 particles, outlet escape 0, separation efficiency 100%

[0060] Particle size 3μm, 458 particles released at the inlet, 2 escaped at the outlet, separation efficiency 99.6%

[0061] Particle size 2μm, 458 particles released at the inlet, 2 escaped at the outlet, separation efficiency 99.6%;

[0062] Table 1 is the filter air volume table.

[0063] Table 1

[0064] Filter unit 1 2 3 4 5 6 <![CDATA[Filter air volume m 3 / h]]> 390.76 463.32 451.48 428.08 429.82 434.56 Filter unit 7 8 9 10 11 12 <![CDATA[Filter air volume m 3 / h]]> 462.75 445.39 418.72 408.76 405.78 404.26 Filter unit 13 14 15 16 17 18 <![CDATA[Filter air volume m 3 / h]]> 391.68 429.33 458.90 452.40 385.75 402.55 Filter unit 19 20 21 22 23 24 <![CDATA[Filter air volume m 3 / h]]> 381.84 363.49 367.56 393.20 421.17 422.27 Filter unit 25 26 27 28 29 30 <![CDATA[Filter air volume m 3 / h]]> 428.98 421.48 389.74 378.54 364.24 378.25 Filter unit 31 32 33 34 35 36 <![CDATA[Filter air volume m 3 / h]]> 391.45 392.61 453.47 448.36 413.28 378.24 Filter unit 37 38 39 40 41 42 <![CDATA[Filter air volume m 3 / h]]> 378.04 417.18 400.74 395.53 418.63 441.59 Filter unit 43 44 45 46 47 48 <![CDATA[Filter air volume m 3 / h]]> 423.25 408.67 421.81 422.79 431.67 389.60

[0065] Table 2 is a flow distribution coefficient table.

[0066] Table 2

[0067]

[0068]

[0069] Referring to Table 1 and Table 2, it can be seen from the classification efficiency that the separation capacity of small-size particles is greatly improved after the filter bags are arranged, and the separation efficiency of particles with a diameter of less than 5-10μm can reach more than 99%. It can be seen from the streamline diagram that after the airflow enters the separator obliquely, it makes a double vortex motion, there is no obvious vortex inside, and the airflow is relatively uniform. The maximum uneven amplitude is 1.81 and the comprehensive uneven amplitude is 0.31, both of which are small, and the internal flow field is uniform.

[0070] Reference Figure 3 , indicating that the particles are filtered by the separator and no material escapes from the outlet pipe.

[0071] Reference Figure 4 , indicating that the flow field in the separator of this embodiment is uniform and no obvious vortex is generated.

[0072] The use of the cyclone bag composite separator of the present invention can effectively improve the problem of low separation efficiency of particles below 10 μm in a single cyclone separator, and solve the problem of substandard emissions during cement powder transportation in existing equipment and the problem of insufficient separation efficiency of the original separator. The equipment of the present invention can be widely used in a variety of materials, such as cement, grain and other materials, and can process materials with different particle size distributions. It is simple to manufacture, occupies a small area, and its application is not limited to the field of pneumatic transportation, and has broad market prospects.

Claims

1. A cyclone bag type composite separator suitable for cement powder unloading equipment, characterized in that: The invention comprises an outer cylinder (9), an inner cylinder (5), a pleated filter bag (4) and a flower plate (8), wherein the inner cylinder (5) is arranged in the outer cylinder (9), the upper end of the inner cylinder (5) is a bell mouth and is connected to the outer cylinder (9), the pleated filter bag (4) is arranged in the inner cylinder (5), the flower plate (8) is arranged in the inner cylinder (5), the pleated filter bag (4) penetrates the flower plate (8) and is connected to the flower plate (8), the outer cylinder (9) is provided with an inlet pipe (1) and an air outlet pipe (6), the inlet pipe (1) is located below the bell mouth of the inner cylinder (5), the air outlet pipe (6) is located above the bell mouth of the inner cylinder (5), the lower end of the outer cylinder (9) is connected to an ash hopper (10), and the ash hopper (10) is provided with a discharge port (11); A plurality of pleated filter bags (4) are provided, and the plurality of pleated filter bags (4) are arranged in a row spraying manner; The number and size of the pleated filter bags (4) satisfy the following relationship: in, D is the diameter of the inner cylinder section, n is the number of pleated filter bags, d is the diameter of the pleated filter bag, a is the safety margin; Diameter of pleated filter bag ,in is the total filtration area of ​​the pleated filter bag, l is the length of the pleated filter bag, x is the air permeability ratio of the pleated filter bag; The inlet pipe (1) comprises a tangential pipe (1-1) and an inclined pipe (1-2); the tangential pipe (1-1) is tangential to the outer cylinder (9); the inclined pipe (1-2) is located in the annular cavity between the outer cylinder (9) and the inner cylinder (5); one end of the inclined pipe (1-2) is connected to the tangential pipe (1-1); the other end of the inclined pipe (1-2) is inclined toward the inlet direction of the inner cylinder (5); the distance between the end of the inclined pipe (1-2) and the inlet end of the inner cylinder (5) is 0.2-0.3 times the length of the inner cylinder (5).

2. The cyclone bag type composite separator suitable for cement powder ship unloading device according to claim 1 is characterized in that: The air permeability ratio of the pleated filter bag is 6~8, and the length of the pleated filter bag is 0.7-0.8 times the length of the inner tube.

3. The cyclone bag type composite separator suitable for cement powder ship unloading device according to claim 2 is characterized in that: The safety margin is 0.6-0.

7.

4. The cyclone bag type composite separator suitable for cement powder ship unloading device according to claim 1, characterized in that: The tangential tube (1-1) and the inclined tube (1-2) are both circular tubes, and the outlet end of the inclined tube (1-2) is configured as an oblique opening, with the opening of the oblique opening facing upward.

5. The cyclone bag type composite separator suitable for cement powder ship unloading device according to claim 1, characterized in that: The upper end of the outer cylinder (9) is configured as an arc-shaped top, on which a row blowing device (3) is provided, the upper end of the pleated filter bag (4) is connected to the row blowing device (3), the lower end of the pleated filter bag (4) extends toward the lower end of the inner cylinder (5), the air outlet of the pleated filter bag (4) is located above the flower plate (8), and the flower plate (8) is mounted on the upper end of the bell mouth of the inner cylinder (5).

6. A separation method suitable for cement powder unloading device, characterized in that: The separation method is carried out using the cyclone bag composite separator according to any one of claims 1 to 5, and comprises the following process: The material is blown from the inlet pipe (1) into the annular chamber between the outer cylinder (9) and the inner cylinder (5) to cause the material to perform a vortex motion. During the vortex motion of the material, a portion of the material falls into the ash hopper (10), and the other portion of the material is filtered by the pleated filter bag (4). The gas in the material is discharged from the air outlet pipe (6).

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