A fly ash particle size classification device and method based on multi-stage cyclone separation

Abstract

This invention relates to the field of cyclone separator technology, and provides a fly ash particle size classification device based on multi-stage cyclone separation, comprising: an outer cylinder, an air inlet, an air outlet, a micro separation module, a flow divider assembly, a middle cylinder, and an inner cylinder. Flue gas enters the outer cylinder through the air inlet and spirals downwards within it. During this process, dust particles in the flue gas are distributed radially along the outer cylinder according to their mass, with larger dust particles closer to the inner wall of the outer cylinder. When the airflow passes through the flow divider assembly, it is divided into two parts. The airflow located inside the flow divider assembly enters the middle cylinder, where secondary separation is completed. After secondary separation, it passes through the inner cylinder and enters the micro separation module for tertiary separation. The airflow located outside the flow divider assembly continues to spiral downwards within the outer cylinder, while this portion of the airflow enters the inner cylinder through an additional connecting pipe, ultimately entering the micro separation module for tertiary separation.

Description

Technical Field

[0001] This invention relates to the field of cyclone separator technology, and in particular to a fly ash particle size classification device and method based on multi-stage cyclone separation. Background Technology

[0002] A cyclone separator is an industrial device that uses centrifugal force to achieve gas-solid or liquid-solid separation. Its core principle is to separate particulate matter from fluid through high-speed rotating airflow. Each model of cyclone separator has a different range of separable particle sizes and can only separate particulate matter. The separated gas still contains particles that are too large or too small. Therefore, after the separator separates dust from the flue gas, the dust needs to undergo additional sieving to achieve particle size classification. Thus, using conventional cyclone separators to separate flue gas is not convenient for subsequent dust processing. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a fly ash particle size classification device and method based on multi-stage cyclone separation.

[0004] A fly ash particle size classification device based on multi-stage cyclone separation includes: an outer cylinder, an air inlet, an air outlet, a micro-separation module, a flow diversion component, a middle cylinder, and an inner cylinder, wherein...

[0005] The outer cylinder is located on the outside of the entire device;

[0006] The air inlet is fixedly installed on the outer circumferential surface of the outer cylinder and communicates with the inner cavity of the outer cylinder.

[0007] The middle cylinder is located inside the outer cylinder, and is concentric with and fixedly connected to the outer cylinder.

[0008] The inner cylinder is located inside the middle cylinder, is concentric with and fixedly connected to the middle cylinder, and is used to separate the middle cylinder from the micro separation module.

[0009] The micro separation module is located inside the inner cylinder.

[0010] The air outlet is located above the outer cylinder and is connected to the air outlet of the micro separation module.

[0011] The flow splitting assembly is installed between the outer cylinder and the middle cylinder, and includes an annular flow splitting plate concentric with the outer cylinder and a conical flow guide plate concentric with the outer cylinder. The two axial ends of the conical flow guide plate are fixedly connected to the annular flow splitting plate and the middle cylinder, respectively. The diameter of the outer cylinder is larger than the diameter of the annular flow splitting plate, which is larger than the diameter of the middle cylinder.

[0012] Furthermore, the middle cylinder includes a conical section, and a vent adjustment component concentrically arranged with the conical section is provided below the middle cylinder. The vent adjustment component is in the shape of a conical cylinder. Multiple circumferentially distributed No. 2 air inlets are provided on the circumferential surface of the conical section. A primary and secondary connecting pipe is provided at each No. 2 air inlet in the conical section. The end of the primary and secondary connecting pipes is connected to the micro separation module. An annular extension section is provided above the conical section. There is a gap between the annular extension section and the vent adjustment component, and there is a gap between the vent adjustment component and the conical section. Several No. 1 air inlets are provided on the circumferential surface of the inner cylinder.

[0013] Furthermore, a lifting platform is fixedly connected to the bottom of the air vent adjustment assembly, and a base is provided below the lifting platform. Several guide rods are fixedly connected to the base, and several lead screws are rotatably connected to the base. The lead screws are threadedly connected to the lifting platform.

[0014] Furthermore, several air guide pipes are fixedly connected to the inner ring surface of the inner cylinder. Each air guide pipe is simultaneously connected to a primary and tertiary connecting pipe and an air guide pipe inlet. The top of the air guide pipe is connected to the micro separation module.

[0015] Furthermore, the micro separation module includes several three-stage separators, a support frame, and an air collection cylinder. Several three-stage separators are simultaneously fixedly connected to the support frame, and all three-stage separators are inserted into the air collection cylinder. The air collection cylinder is fixedly connected to the inner cylinder body, and the internal cavity of the air collection cylinder is connected to the air inlet of the three-stage separators. Several connecting grooves for connecting air guide pipes are provided on the outer circumference of the air collection cylinder, and an air guide pipe outlet is opened at the corresponding connecting groove on the air guide pipe.

[0016] Furthermore, a three-stage air inlet is fixedly installed on the outer ring surface of the three-stage separator. The three-stage air inlet serves as the air intake end of the three-stage separator. An exhaust pipe is fixedly connected inside the three-stage air inlet and is arranged concentrically with it. The top of the exhaust pipe extends to the outside of the three-stage separator, and the outer ring surface of the exhaust pipe is sealed to the top of the three-stage separator. A dust collection port is provided below the three-stage separator.

[0017] Furthermore, a cover is provided above the inner cylinder, and a groove with a diameter smaller than that of the inner cylinder is provided inside the cover, which serves as an air outlet.

[0018] Furthermore, a ring-shaped primary collection box is fixedly installed at the bottom of the outer cylinder, and a ring-shaped sealing sleeve is fixedly connected to the outer wall of the air vent adjustment component. The outer ring surface of the inner wall of the primary collection box is sealed to the inner ring surface of the outer wall of the sealing sleeve.

[0019] Furthermore, a ring-shaped secondary collection box is fixedly installed at the bottom of the air vent adjustment component, and a ring-shaped sealing component is fixedly installed on the outer ring of the inner cylinder. The inner ring surface of the outer wall of the sealing component is sealed to the outer ring of the inner wall of the secondary collection box. A tertiary ash discharge port is provided at the bottom of the inner cylinder, and a tertiary collection box is fixedly connected to the bottom of the tertiary ash discharge port.

[0020] A method for particle size classification of fly ash based on multi-stage cyclone separation includes the following steps:

[0021] The air inlet receives the flue gas, allowing it to enter the outer cylinder for primary separation.

[0022] The flue gas is introduced into the diversion component, where it is separated.

[0023] The drive air vent adjustment component moves to adjust the flow ratio of the flow splitting component;

[0024] The flue gas enters the middle cylinder to achieve secondary separation;

[0025] The flue gas inside the outer cylinder and the flue gas inside the middle cylinder enter the micro separation module for three-stage separation.

[0026] The technical effects and advantages of this invention are as follows:

[0027] After the flue gas enters the outer cylinder through the inlet, it spirals downwards within the outer cylinder. During this process, dust particles in the flue gas are distributed radially along the outer cylinder according to their mass, with larger dust particles being closer to the inner wall of the outer cylinder. When the airflow passes through the diversion assembly, it is divided into two parts. The airflow located inside the diversion assembly enters the middle cylinder, where secondary separation is completed. After secondary separation, it passes through the inner cylinder and enters the micro-separation module for tertiary separation. The airflow located outside the diversion assembly continues to spiral downwards within the outer cylinder, and this part of the airflow enters the inner cylinder through an additional connecting pipe, ultimately entering the micro-separation module for tertiary separation.

[0028] This application allows for the configuration of different flow divider components based on various application scenarios. The diameter of the annular flow divider and the angle of the conical guide plate can be adjusted according to the particle size and amount of dust in the flue gas to achieve better separation and classification effects.

[0029] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0030] Figure 1 A schematic diagram of the structure of the present invention is shown;

[0031] Figure 2 A schematic diagram of the structure of the middle cylinder in this invention is shown;

[0032] Figure 3 A schematic diagram of the pore adjustment component in this invention is shown;

[0033] Figure 4 A schematic diagram of the outer annular surface of the inner cylinder in this invention is shown;

[0034] Figure 5 A diagram showing the positional relationship of the various cylindrical bodies of the present invention is provided.

[0035] Figure 6 A schematic diagram of the inner ring surface of the inner cylinder in this invention is shown;

[0036] Figure 7 A schematic diagram of the micro separation module in this invention is shown;

[0037] Figure 8 A schematic diagram of the micro separator in this invention is shown;

[0038] In the picture:

[0039] 1-Outer cylinder, 2-Air inlet, 3-Air outlet, 4-Miniature separation module, 5-First-stage collection box, 6-Base, 7-Middle cylinder, 8-Diverter assembly, 9-Air vent adjustment assembly, 10-Inner cylinder, 11-No. 1 air duct inlet; 12-First and third-stage connecting pipe, 13-Second-stage collection box, 14-Third-stage ash discharge port, 15-Sealing component, 16-Air duct, 17-Air duct outlet, 18-Cover, 41-Third-stage separator, 42-Bracket, 43-Air collection cylinder, 44-Third-stage air inlet, 45-Exhaust pipe, 46-Ash discharge port, 61-Guide rod, 62-Screw rod, 71-Conical section, 72-No. 2 air duct inlet, 73-Annular extension section, 91-Lifting platform, 92-Sealing sleeve. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Furthermore, in this invention, the terms "first," "second," and other similar words are not intended to imply any order, quantity, or importance, but are merely used to distinguish different elements, and the terms "upper," "lower," "left," "right," and other similar words are merely positional relationships in the accompanying drawings.

[0042] like Figures 1-7 As shown, one embodiment of the present invention provides a fly ash particle size classification device based on multi-stage cyclone separation, comprising: an outer cylinder 1, an air inlet 2, an air outlet 3, a micro separation module 4, a flow diversion component 8, a middle cylinder 7, and an inner cylinder 10, wherein,

[0043] The outer cylinder 1, located on the outside of the entire device, is used for primary separation;

[0044] The middle cylinder 7 is located inside the outer cylinder 1 and is concentric with the outer cylinder 1, and is used for secondary separation;

[0045] The inner cylinder 10 is located inside the middle cylinder 7 and is concentric with the middle cylinder 7. It is used to separate the middle cylinder 7 from the micro separation module 4.

[0046] The micro separation module 4 is located inside the inner cylinder 10 and is used for three-stage separation;

[0047] The air outlet 3 is located above the outer cylinder 1 and is connected to the air outlet of the micro separation module 4;

[0048] The flow divider assembly 8 is installed between the outer cylinder 1 and the middle cylinder 7. It includes an annular flow divider plate concentric with the outer cylinder 1 and a conical guide plate concentric with the outer cylinder 1. The two axial ends of the conical guide plate are fixedly connected to the annular flow divider plate and the middle cylinder 7, respectively. The diameter of the outer cylinder 1 is larger than the diameter of the annular flow divider plate, which is larger than the diameter of the middle cylinder 7.

[0049] After the flue gas enters the outer cylinder 1 through the air inlet 2, it spirals down inside the outer cylinder 1. During this process, the dust in the flue gas will be distributed radially along the outer cylinder 1 according to its mass. The larger the dust, the closer it is to the inner wall of the outer cylinder 1. This is the first stage of separation.

[0050] When the airflow passes through the diversion component 8, the airflow is divided into two parts. The airflow located inside the diversion component 8 enters the middle cylinder 7 and completes the secondary separation in the middle cylinder 7. After completing the secondary separation, it passes through the inner cylinder 10 and enters the micro separation module 4 for tertiary separation.

[0051] The airflow located outside the diversion component 8 continues to spiral down inside the outer cylinder 1, while this part of the airflow will enter the inner cylinder 10 through an additional connecting pipe, and finally enter the micro separation module 4 for three-stage separation.

[0052] As described above, when the airflow passes through the diversion component 8, the airflow is divided into two parts. The airflow inside the diversion component 8 enters the middle cylinder 7 and eventually enters the micro separation module. The airflow outside the diversion component 8 continues to spiral down inside the outer cylinder 1, and this part of the airflow enters the micro separation module through an additional connecting pipe. Thus, from the air inlet 2 to the air outlet 3, the flue gas has two flow paths, and the flow area of ​​the two flow paths determines the proportion of flue gas entering the two flow paths.

[0053] On the other hand, the particle size distribution in flue gas is inconsistent for different application scenarios. Correspondingly, in the diversion component 8, the ratio of the diameter difference between the annular diversion plate and the outer cylinder 1 to the diameter difference between the annular diversion plate and the middle cylinder 7 can be adjusted according to different application scenarios. In scenarios with larger particle size, the above ratio is larger.

[0054] For the conical guide plate, the smaller the angle between it and the through plane of the middle cylinder 7, the smaller the pitch of the flue gas spiraling down, the greater the centrifugal force, and the longer the flue gas stays in the middle cylinder 7 and the outer cylinder 1. Therefore, for application scenarios with higher dust content, the angle between the conical guide plate and the through plane of the middle cylinder 7 should be smaller.

[0055] like Figure 3 and Figure 4 As shown, in one embodiment of the present invention, the middle cylinder 7 includes a conical section 71, and a vent adjustment component 9 is provided below the middle cylinder 7, which is concentrically arranged with the conical section 71. The vent adjustment component 9 is in the shape of a conical cylinder. Multiple circumferentially distributed secondary air inlets 72 are provided on the circumferential surface of the conical section 71. A tertiary connecting pipe 12 is provided at each secondary air inlet 72 in the conical section 71. The end of the tertiary connecting pipe 12 is connected to the micro separation module 4. Furthermore, an annular extension section 73 is provided above the conical section 71. There is a gap between the annular extension section 73 and the vent adjustment component 9, and there is a gap between the vent adjustment component 9 and the conical section 71. In this way, the flue gas in the outer cylinder 1 will pass through the two "gaps", the secondary air inlet 72 and the tertiary connecting pipe 12 in sequence, and finally enter the micro separation module 4.

[0056] At the same time, such as Figure 4 As shown, several No. 1 air inlets 11 are provided on the circumferential surface of the inner cylinder 10. The flue gas in the middle cylinder 7 enters the micro separation module 4 after passing through the No. 1 air inlets 11.

[0057] To adjust the size of the aforementioned "gap", such as Figure 3As shown, a lifting platform 91 is fixedly connected to the bottom of the air vent adjustment component 9, and a base 6 is provided below the lifting platform 91. Several guide rods 61 are fixedly connected to the base 6, and several lead screws 62 are rotatably connected to the base 6. The lead screws 62 are threadedly connected to the lifting platform 91. Thus, by rotating the lead screws 62, the height of the lifting platform 91 can be adjusted, thereby adjusting the height of the air vent adjustment component 9, thereby adjusting the gap between the air vent adjustment component 9 and the annular extension section 73 and the gap between the air vent adjustment component 9 and the conical section 71, thereby adjusting the ratio of flue gas entering the two flow paths.

[0058] like Figure 5 As shown, in one embodiment of the present invention, a plurality of air guide pipes 16 are fixedly connected to the inner ring surface of the inner cylinder 10. Each air guide pipe 16 is simultaneously connected to a first-third stage connecting pipe 12 and a first air guide pipe inlet 11. The top of the air guide pipe 16 is connected to the micro separation module 4.

[0059] like Figure 6 and Figure 7 As shown, in one embodiment of this application, the micro separation module 4 includes several three-stage separators 41, a support 42, and a gas collection cylinder 43. Several three-stage separators 41 are fixedly connected to the support 42, and all three-stage separators 41 are inserted into the gas collection cylinder 43. The gas collection cylinder 43 is fixedly connected to the inner cylinder 10. The internal cavity of the gas collection cylinder 43 is connected to the air inlet of the three-stage separators 41. At the same time, several connecting grooves for connecting the air guide pipes 16 are provided on the outer circumferential surface of the gas collection cylinder 43. A gas guide pipe outlet 17 is opened on the air guide pipe 16 at the corresponding connecting groove. In this way, after the flue gas enters the air guide pipe 16, it enters the gas collection cylinder 43 through the gas guide pipe outlet 17 and finally enters each three-stage separator 41.

[0060] like Figure 8 As shown, in one embodiment of this application, a three-stage air inlet 44 is fixedly installed on the outer ring surface of the three-stage separator 41. The three-stage air inlet 44 serves as the air inlet end of the three-stage separator 41. An exhaust pipe 45 is fixedly connected inside the three-stage air inlet 44 and is concentrically arranged therewith. The top of the exhaust pipe 45 extends to the outside of the three-stage separator 41, and the outer ring surface of the exhaust pipe 45 is sealed to the top of the three-stage separator 41. A dust collection port 46 is provided at the bottom of the three-stage separator 41. In this way, after the flue gas enters the three-stage separator 41, it spirals downwards inside the three-stage separator 41 and finally enters the air outlet 3 through the exhaust pipe 45, while the dust is discharged from the dust collection port 46 along the inner wall of the three-stage separator 41.

[0061] like Figure 5 and Figure 6As shown, in one embodiment of this application, the tops of the outer cylinder 1, the middle cylinder 7, and the inner cylinder 10 are all fixedly connected with radially extending mounting rings. The tops of the outer cylinder 1, the middle cylinder 7, and the inner cylinder 10 are fixedly connected by mounting rings and bolts. Meanwhile, as... Figure 6 As shown, a cover 18 is provided above the inner cylinder 10. The cover 18 has a groove with a diameter smaller than that of the inner cylinder 10. This groove serves as an air outlet 3. At the same time, several through holes are provided at the bottom of the groove, and each three-stage separator 41 is inserted into each through hole in a corresponding manner.

[0062] To better collect dust from flue gas, such as Figure 4 As shown, a ring-shaped primary collection box 5 is fixedly installed at the bottom of the outer cylinder 1, and a ring-shaped sealing sleeve 92 is fixedly connected to the outer wall of the air vent adjustment component 9. The outer ring surface of the inner wall of the primary collection box 5 is sealed to the inner ring surface of the outer wall of the sealing sleeve 92.

[0063] A ring-shaped secondary collection box 13 is fixedly installed at the bottom of the vent adjustment assembly 9, and a ring-shaped sealing member 15 is fixedly installed on the outer ring of the inner cylinder 10. The inner ring surface of the outer wall of the sealing member 15 is sealed and fitted with the outer ring of the inner wall of the secondary collection box 13.

[0064] Meanwhile, the bottom of the inner cylinder 10 is provided with a three-stage ash discharge port 14, and a three-stage collection box (not shown in the figure) is fixedly connected to the bottom of the three-stage ash discharge port 14.

[0065] Based on the above-mentioned fly ash particle size classification device based on multi-stage cyclone separation, this application provides a fly ash particle size classification method based on multi-stage cyclone separation, including the following steps:

[0066] S1: The air inlet 2 receives the flue gas, allowing the flue gas to enter the outer cylinder 1 to achieve primary separation, separating out dust particles with a larger particle size range, and making the dust particles in the flue gas distributed in an orderly manner between the outer cylinder 1 and the middle cylinder 7 according to their mass size.

[0067] S2: The flue gas after primary separation enters the diversion component 8, which separates the flue gas as a whole, so that a part of the flue gas continues to move downward along the gap between the outer cylinder 1 and the middle cylinder 7, while the other part of the flue gas moves downward along the gap between the middle cylinder 7 and the inner cylinder 10.

[0068] S3: Drive the air vent adjustment component 9 to move and adjust the flow ratio of the flow splitting component 8;

[0069] S4: After the flue gas enters between the middle cylinder 7 and the inner cylinder 10, the flow velocity increases, and secondary separation is achieved in the middle cylinder 7, separating dust with a medium particle size range.

[0070] S5: Allows the flue gas in the outer cylinder 1 and the flue gas in the middle cylinder 7 to enter the micro separation module 4 for three-stage separation, separating out dust with a smaller particle size range.

[0071] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fly ash particle size classification device based on multi-stage cyclone separation, characterized in that, include: The outer cylinder (1), air inlet (2), air outlet (3), micro separation module (4), flow divider assembly (8), middle cylinder (7), and inner cylinder (10), wherein, The outer cylinder (1) is located on the outside of the entire device; The air inlet (2) is fixedly installed on the outer circumferential surface of the outer cylinder (1) and communicates with the inner cavity of the outer cylinder (1); The middle cylinder (7) is located inside the outer cylinder (1), and is concentric with and fixedly connected to the outer cylinder (1); The inner cylinder (10) is located inside the middle cylinder (7), is concentric with and fixedly connected to the middle cylinder (7), and is used to separate the middle cylinder (7) from the micro separation module (4). The micro separation module (4) is located inside the inner cylinder (10); The air outlet (3) is located above the outer cylinder (1) and is connected to the air outlet of the micro separation module (4); The diversion assembly (8) is installed between the outer cylinder (1) and the middle cylinder (7), including an annular diversion plate concentric with the outer cylinder (1) and a conical guide plate concentric with the outer cylinder (1). The two axial ends of the conical guide plate are fixedly connected to the annular diversion plate and the middle cylinder (7) respectively. The diameter of the outer cylinder (1) is greater than the diameter of the annular diversion plate and the diameter of the middle cylinder (7). The middle cylinder (7) includes a conical section (71), and a vent adjustment component (9) is provided concentrically with the conical section (71) below the middle cylinder (7). The vent adjustment component (9) is in the shape of a conical cylinder. Multiple second-stage air inlets (72) are equidistantly distributed on the circumferential surface of the conical section (71). A first-stage connecting pipe (12) is provided at each second-stage air inlet (72) in the conical section (71). The end of the first-stage connecting pipe (12) is connected to the micro separation module (4). An annular extension section (73) is provided above the conical section (71). There is a gap between the annular extension section (73) and the vent adjustment component (9). There is a gap between the vent adjustment component (9) and the conical section (71). Several first-stage air inlets (11) are provided on the circumferential surface of the inner cylinder (10). Several air guide pipes (16) are fixedly connected to the inner ring surface of the inner cylinder (10). Each air guide pipe (16) is simultaneously connected to a first-third stage connecting pipe (12) and a first air guide pipe inlet (11). The top of the air guide pipe (16) is connected to the micro separation module (4).

2. The fly ash particle size classification device based on multi-stage cyclone separation according to claim 1, characterized in that, The bottom of the air vent adjustment component (9) is fixedly connected to a lifting platform (91), and a base (6) is provided below the lifting platform (91). Several guide rods (61) are fixedly connected to the base (6), and several lead screws (62) are rotatably connected to the base (6). The lead screws (62) are threadedly connected to the lifting platform (91).

3. The fly ash particle size classification device based on multi-stage cyclone separation according to claim 1, characterized in that, The micro separation module (4) includes several three-stage separators (41), a support (42), and an air collection cylinder (43). Several three-stage separators (41) are fixedly connected to the support (42) and are inserted into the air collection cylinder (43). The air collection cylinder (43) is fixedly connected to the inner cylinder (10). The internal cavity of the air collection cylinder (43) is connected to the air inlet of the three-stage separators (41). Several connecting grooves for connecting the air guide pipe (16) are provided on the outer circumference of the air collection cylinder (43). An air guide pipe outlet (17) is opened on the air guide pipe (16) at the corresponding connecting groove.

4. The fly ash particle size classification device based on multi-stage cyclone separation according to claim 3, characterized in that, A three-stage air inlet (44) is fixedly installed on the outer ring surface of the three-stage separator (41). The three-stage air inlet (44) serves as the air inlet end of the three-stage separator (41). An exhaust pipe (45) is fixedly connected inside the three-stage air inlet (44) and is arranged concentrically therewith. The top of the exhaust pipe (45) extends to the outside of the three-stage separator (41), and the outer ring surface of the exhaust pipe (45) is sealed to the top of the three-stage separator (41). A dust collection port (46) is provided below the three-stage separator (41).

5. The fly ash particle size classification device based on multi-stage cyclone separation according to claim 1, characterized in that, A cover (18) is also provided above the inner cylinder (10). The cover (18) has a groove with a diameter smaller than that of the inner cylinder (10), which serves as an air outlet (3).

6. The fly ash particle size classification device based on multi-stage cyclone separation according to claim 1, characterized in that, The bottom of the outer cylinder (1) is fixedly installed with a ring-shaped primary collection box (5), and a ring-shaped sealing sleeve (92) is fixedly connected to the outer wall of the air hole adjustment component (9). The outer ring surface of the inner wall of the primary collection box (5) is sealed to the inner ring surface of the outer wall of the sealing sleeve (92).

7. The fly ash particle size classification device based on multi-stage cyclone separation according to claim 1, characterized in that, The bottom of the air vent adjustment component (9) is fixedly installed with a ring-shaped secondary collection box (13), and a ring-shaped sealing component (15) is fixedly installed on the outer ring of the inner cylinder (10). The inner ring surface of the outer wall of the sealing component (15) is sealed and matched with the outer ring of the inner wall of the secondary collection box (13). The bottom of the inner cylinder (10) is provided with a tertiary ash discharge port (14), and a tertiary collection box is fixedly connected to the bottom of the tertiary ash discharge port (14).

8. A method for particle size classification of fly ash based on multi-stage cyclone separation, characterized in that, The fly ash particle size classification device based on multi-stage cyclone separation as described in any one of claims 1-7 includes the following steps: The air inlet (2) receives the flue gas, allowing the flue gas to enter the outer cylinder (1) to achieve primary separation; The flue gas is introduced into the diversion component (8), and the flue gas is separated by the diversion component (8); The drive air vent adjustment component (9) moves to adjust the flow ratio of the flow splitting component (8); This allows the flue gas to enter the middle cylinder (7) for secondary separation; The flue gas inside the outer cylinder (1) and the flue gas inside the middle cylinder (7) are introduced into the micro separation module (4) for three-stage separation.

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