Multi-stage dust removal device

Abstract

The utility model provides a multi-stage dust removal device, which relates to the technical field of dust removal equipment, and comprises a dust removal shell, an input pipe and a multi-stage dust removal assembly, the dust removal shell comprises a dust removal cavity and an air outlet communicated with the dust removal cavity; the input pipe is inserted into the dust removal shell and is communicated with the dust removal cavity, a gap between the input pipe and the dust removal shell forms a filtering channel, and the filtering channel is communicated with the air outlet; the multi-stage dust removal assembly comprises a first cyclone dust removal mechanism, a second cyclone dust removal mechanism and a stop dust removal mechanism which are arranged in the filtering channel at intervals from bottom to top. According to the converter gas dust removal device, multi-stage dust removal operation can be achieved, large-particle dust in converter gas can be efficiently captured through multiple dust removal modes of coupling gravity, inertia force, centrifugal force, coagulation, stopping and the like, and the dust removal load of a follow-up fine dust removal device is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to dust removal equipment technical field, especially a kind of multistage dust removal device. BACKGROUND

[0002] Converter gas is an industrial waste gas containing high concentration dust and various harmful components, and its initial dust content can be as high as 150g / Nm 3 . In order to reduce the load of subsequent fine dust removal equipment, so that the fine dust removal equipment realizes the goal of ultra-low emission (such as dust concentration less than 10mg / Nm 3 ), the existing converter gas dust removal mainly relies on electrostatic precipitator and bag filter technology. The existing dust removal technology needs to ensure efficient and stable dust removal effect under high dust content condition, especially when dealing with high concentration dust, which puts high requirements on fine dust removal facilities. In order to improve the dust removal effect, electrostatic precipitator usually needs to be configured with large diameter, which leads to large floor area, high investment cost and increases the difficulty of subsequent maintenance. And after long-term operation, the problem of electrode dust accumulation of electrostatic precipitator will affect its dust removal effect, which makes it difficult for subsequent fine dust removal equipment to stably control the dust concentration to below 10mg / Nm 3 . In order to improve the dust removal effect, bag filter usually needs to reduce the filtration wind speed, thereby increasing the equipment volume and operation cost. In addition, the filter bag of bag filter is easy to be affected by dust accumulation or chemical corrosion, which reduces the filtration performance of filter bag and further reduces the dust removal effect. With the increasing strictness of environmental protection requirements, the dust removal requirements of converter gas dust removal system are continuously improved. Therefore, how to improve the dust removal effect of converter gas and realize long-term stable operation has become a technical problem to be solved at present. UTILITY MODEL CONTENT

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the utility model is to provide a multistage dust removal device for improving the dust removal effect of converter gas and realizing long-term stable operation.

[0004] The above-mentioned purpose of the utility model can be realized by the following technical scheme, the utility model provides a kind of multistage dust removal device, comprising:

[0005] Dust removal shell, the dust removal shell includes dust removal cavity and the gas outlet communicated with the dust removal cavity;

[0006] Input pipe, the input pipe is inserted and is arranged in the dust removal shell and is communicated with the dust removal cavity, the gap between the input pipe and the dust removal shell constitutes filter channel, and the filter channel is communicated with the gas outlet;

[0007] The multi-stage dust removal assembly comprises a first cyclone dust removal mechanism, a second cyclone dust removal mechanism and a stop dust removal mechanism which are arranged in the filtering channel in a lower-to-upper direction.

[0008] In a preferred embodiment of the present application, the input pipe comprises a connected inlet pipe section, a reducing pipe section and a descending pipe section, the radial dimension of the inlet pipe section is greater than that of the descending pipe section.

[0009] In a preferred embodiment of the present application, the first cyclone dust removal mechanism is arranged between the descending pipe section and the dust removal shell, and the second cyclone dust removal mechanism and the stop dust removal mechanism are arranged between the inlet pipe section and the dust removal shell.

[0010] In a preferred embodiment of the present application, the multi-stage dust removal device further comprises a dust cleaning mechanism, which is arranged at the upper part of the dust removal shell.

[0011] In a preferred embodiment of the present application, the dust cleaning mechanism comprises at least one acoustic dust cleaning device, which is arranged at the upper part of the dust removal shell.

[0012] In a preferred embodiment of the present application, the first cyclone dust removal mechanism comprises a first cyclone separator arranged between the descending pipe section and the dust removal shell, and the first cyclone separator comprises a plurality of first cyclone vanes arranged around the descending pipe section.

[0013] In a preferred embodiment of the present application, the second cyclone dust removal mechanism comprises a second cyclone separator arranged between the inlet pipe section and the dust removal shell, and the second cyclone separator comprises a plurality of second cyclone vanes arranged around the inlet pipe section.

[0014] In a preferred embodiment of the present application, the stop dust removal mechanism comprises a porous baffle arranged between the inlet pipe section and the dust removal shell.

[0015] In a preferred embodiment of the present application, the porous baffle is arranged on the inlet pipe section, and the end of the porous baffle away from the inlet pipe section is arranged in a downward inclination.

[0016] In a preferred embodiment of the present application, the bottom of the dust removal shell is provided with a dust collecting hopper.

[0017] The technical scheme of the present application has the following remarkable beneficial effects:

[0018] The multi-stage dust removal device uses the converter gas to be treated to input into the input pipe, the converter gas moves downward along the input pipe to the filtering channel, and the converter gas is subjected to multiple dust removal operations in turn along the filtering channel through the first cyclone dust removal mechanism, the second cyclone dust removal mechanism and the stop dust removal mechanism, and then the treated converter gas is output from the gas outlet. Specifically, the first cyclone dust removal mechanism can use the centrifugal force principle to throw the large particle dust in the converter gas to the cylinder wall of the input pipe and settle, and the large particle dust in the converter gas is preliminarily removed, thereby reducing the subsequent processing load. The second cyclone dust removal mechanism further enhances the centrifugal force effect, which is beneficial to capture smaller particle dust and ensure that the dust content of the converter gas entering the next stage is greatly reduced. Moreover, the stop dust removal mechanism can intercept the remaining small particle dust, and deep purification is realized. The multi-stage dust removal device can realize multi-stage dust removal operation, and can efficiently capture the large particle dust in the converter gas through coupling of gravity, inertial force, centrifugal force, coalescence and stop, thereby effectively reducing the dust removal load of the subsequent fine dust removal device. Moreover, the multi-stage dust removal device uses a mechanical structure to perform dust removal operation, thereby reducing the equipment damage risk, prolonging the service life and improving the operation stability. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0020] The drawings described herein are for illustrative purposes only, and are not intended to limit the scope of the present application in any way. In addition, the shapes and scale sizes of the components in the drawings are only illustrative, and are used to help understand the present application, and are not specific limitations on the shapes and scale sizes of the components of the present application. Those skilled in the art can select various possible shapes and scale sizes to implement the present application according to specific circumstances under the guidance of the present application.

[0021] Figure 1 A side view cross-sectional view of one embodiment of the multi-stage dust removal device of the present application;

[0022] Figure 2 A Figure 1 A-A cross-sectional structure schematic view in the middle;

[0023] Figure 3 A Figure 1 B-B cross-sectional structure schematic view in the middle;

[0024] Figure 4 A Figure 1A cross-sectional structure of the middle C-C is shown in the figure;

[0025] Figure 5 For Figure 1 A cross-sectional structure of the middle D-D is shown in the figure.

[0026] Reference signs in the above figures:

[0027] 10, filter channel;

[0028] 100, dust removal shell; 110, air outlet; 120, dust collecting hopper;

[0029] 200, input pipe; 210, inlet pipe section; 220, reducing pipe section; 230, descending pipe section;

[0030] 300, multi-stage dust removal assembly;

[0031] 310, first cyclone dust removal mechanism; 311, first cyclone separator; 3111, first cyclone vane;

[0032] 320, second cyclone dust removal mechanism; 321, second cyclone separator; 3211, second cyclone vane;

[0033] 330, stop dust removal mechanism; 331, porous baffle;

[0034] 400, dust cleaning mechanism; 410, acoustic dust cleaning device. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] Please refer to Figures 1 to 5 The embodiment of the present application provides a multi-stage dust removal device, which comprises a dust removal shell 100, an input pipe 200 and a multi-stage dust removal assembly 300. The dust removal shell 100 comprises a dust removal cavity and an air outlet 110 communicating with the dust removal cavity. The input pipe 200 is inserted and arranged in the dust removal shell 100 and communicates with the dust removal cavity. The gap between the input pipe 200 and the dust removal shell 100 constitutes a filter channel 10, and the filter channel 10 communicates with the air outlet 110. The multi-stage dust removal assembly 300 comprises a first cyclone dust removal mechanism 310, a second cyclone dust removal mechanism 320 and a stop dust removal mechanism 330 which are arranged in the filter channel 10 in a downward-to-upward direction.

[0037] Overall, the multi-stage dust removal device uses the converter gas to be treated to be input to the input pipe 200, the converter gas moves downward along the input pipe 200 to the filter channel 10, and is sequentially subjected to the first cyclone dust removal mechanism 310, the second cyclone dust removal mechanism 320 and the stop dust removal mechanism 330 along the filter channel 10 to perform multiple dust removal operations, and then the treated converter gas is output from the gas outlet 110.

[0038] Specifically, the first cyclone dust removal mechanism 310 can use the principle of centrifugal force to throw large particle dust in the converter gas to the cylinder wall of the input pipe 200 and settle, thereby preliminarily removing most of the dust in the converter gas and reducing the subsequent processing load. The second cyclone dust removal mechanism 320 further enhances the centrifugal force effect, which is conducive to capturing smaller particle dust and ensuring that the converter gas entering the next stage has a significantly reduced dust content. Furthermore, the stop dust removal mechanism 330 can intercept the remaining small particle dust again to achieve deep purification.

[0039] The utility model can realize multi-stage dust removal operation, and can efficiently capture large particle dust in the converter gas by coupling gravity, inertial force, centrifugal force, coagulation and stop, thereby effectively reducing the dust removal load of the subsequent fine dust removal device. Furthermore, the utility model uses a mechanical structure for dust removal operation, thereby reducing the risk of equipment damage, prolonging the service life, and improving the operation stability.

[0040] In the embodiment of the utility model, the bottom of the dust removal shell 100 is provided with an ash collecting hopper 120. By arranging the ash collecting hopper 120 at the bottom of the dust removal shell 100, dust can be effectively collected and stored.

[0041] Specifically, the ash collecting hopper 120 is generally funnel-shaped, thereby ensuring smooth sliding and concentrated accumulation of dust and improving the dust collecting effect. Furthermore, an ash discharge port can be arranged at the bottom of the ash collecting hopper 120 to facilitate subsequent dust cleaning and discharge operation.

[0042] In the embodiment of the utility model, as shown in the example of Figure 1 The input pipe 200 includes a connected inlet pipe section 210, a variable diameter pipe section 220 and a descending pipe section 230, and the radial dimension of the inlet pipe section 210 is greater than that of the descending pipe section 230.

[0043] When the gas enters the variable diameter pipe section 220 from the inlet pipe section 210, the flow rate of the converter gas increases due to the reduction of the cross-sectional area, thereby increasing the kinetic energy of the dust in the converter gas.

[0044] In a specific embodiment, the converter gas to be treated enters the multi-stage dust removal device through the inlet pipe section 210 and flows downward along the inlet pipe section 210 at a flow rate of about 10 m / s; then, the converter gas passes through the variable-diameter pipe section 220 into the smaller-diameter descending pipe section 230, and the flow rate of the converter gas is increased from about 10 m / s to about 15 m / s, and the dust in the converter gas has higher kinetic energy than in the inlet pipe section 210.

[0045] Moreover, after the converter gas flows out of the end of the descending pipe section 230 and enters the filter channel 10, the converter gas needs to turn back 180° and flow upward, and since the radial dimension of the filter channel 10 is much larger than that of the descending pipe section 230, the flow rate of the converter gas is reduced from about 15 m / s to about 6 m / s, so that the converter gas and the dust have a large speed difference, and the larger particles (generally larger than 50 um) in the dust continue to move downward under the action of gravity and inertial force and are captured by the lower dust hopper 120, so that the dust-containing converter gas can complete a mechanical dust removal operation at this point.

[0046] In the embodiment of the utility model, first cyclone dust removal mechanism 310 is arranged between descending pipe section 230 and dust removal shell 100, second cyclone dust removal mechanism 320 and stop dust removal mechanism 330 are arranged between inlet pipe section 210 and dust removal shell 100.

[0047] By arranging the first cyclone dust removal mechanism 310 between the descending pipe section 230 and the dust removal shell 100, the high-speed characteristics of the converter gas flowing out of the descending pipe section 230 can be fully utilized, and the medium-sized dust particles can be efficiently captured by centrifugal force.

[0048] Moreover, the second cyclone dust removal mechanism 320 and the stop dust removal mechanism 330 are arranged between the inlet pipe section 210 and the dust removal shell 100, the second cyclone dust removal mechanism 320 can further strengthen the capture effect of small-sized dust particles, and the stop dust removal mechanism 330 can effectively block part of the rebounding particles from re-entering the gas flow of the converter gas, thereby realizing the function of graded dust removal and improving the overall dust removal efficiency.

[0049] In a specific embodiment, after the large particles are removed, the dust-containing converter gas enters the first cyclone dust removal mechanism 310 upward, and the dust in the converter gas obtains a certain centrifugal force after passing through the first cyclone dust removal mechanism 310, so that the converter gas moves toward the input pipe 200 under the action of centrifugal force, at this time, the dust in the converter gas impacts the descending pipe section 230 and can settle into the lower dust hopper 120 along the outer wall of the descending pipe section 230, and the flow rate is controlled at about 10 m / s, so that the medium-sized dust particles (generally 20 um-50 um) can be better captured, and the dust-containing converter gas can complete a secondary mechanical dust removal operation at this point.

[0050] And, the converter gas processed by the first cyclone dust removal mechanism 310 continues to move upward into the second cyclone dust removal mechanism 320, at this time, the flow rate of the converter gas is accelerated from about 10 m / s to about 15 m / s, so that the dust in the converter gas obtains greater centrifugal force in the second cyclone dust removal mechanism 320.

[0051] At the same time, the converter gas at the second cyclone dust removal mechanism 320 is in a high-speed turbulent state, part of the particles in the converter gas generate static electricity due to friction, the charged particles are attracted to each other under the action of electrostatic force and agglomerate to generate larger particle size dust, this part of the dust (generally particle size 5um-20um) will hit the inlet pipe section 210 and settle along the outer wall of the inlet pipe section 210 to the lower dust hopper 120, so that the dust-containing converter gas can complete three mechanical dust removal here.

[0052] In the embodiment of the utility model, as shown in the example, Figure 2 The first cyclone dust removal mechanism 310 includes a first cyclone separator 311 arranged between the descending pipe section 230 and the dust removal shell 100, and the first cyclone separator 311 includes a plurality of first cyclone blades 3111 arranged around the descending pipe section 230.

[0053] By arranging the first cyclone separator 311 containing a plurality of first cyclone blades 3111 between the descending pipe section 230 and the dust removal shell 100, the converter gas forms a strong rotational motion after passing through the first cyclone separator 311, thereby fully utilizing the principle of centrifugal force, so that the medium particle size dust (generally 20-50um) is effectively thrown to the outer wall of the descending pipe section 230 and settled in the dust hopper 120 during high-speed rotation, thereby realizing high-efficiency trapping effect.

[0054] The designer can adjust the number and structure of the first cyclone blades 3111 according to the use needs, which is not specifically limited here. For example, a plurality of first cyclone blades 3111 are arranged around in a clockwise or counterclockwise direction, one end of the first cyclone blade 3111 abuts against the dust removal shell 100, the other end of the first cyclone blade 3111 abuts against the descending pipe section 230, and the first cyclone blade 3111 is arranged obliquely to the radial direction of the dust removal shell 100.

[0055] In the embodiment of the utility model, as shown in the example, Figure 3 The second cyclone dust removal mechanism 320 includes a second cyclone separator 321 arranged between the inlet pipe section 210 and the dust removal shell 100, and the second cyclone separator 321 includes a plurality of second cyclone blades 3211 arranged around the inlet pipe section 210.

[0056] By setting the second cyclone separator 321 containing a plurality of second cyclone vanes 3211 between the inlet pipe section 210 and the dust removal shell 100, the rotating effect of the converter gas can be further enhanced, so that small particle size dust (generally less than 20 μm) is thrown to the outer wall of the inlet pipe section 210 under the action of centrifugal force and settled into the dust hopper 120.

[0057] Due to the large radial size of the inlet pipe section 210, the radial size of the filter channel 10 corresponding to the inlet pipe section 210 is reduced, thereby increasing the gas flow speed in this part of the filter channel 10, which helps to enhance the cyclone effect of the second cyclone separator 321, thereby improving the capture efficiency of small particle size dust.

[0058] The designer can adjust the number and structure of the first cyclone vanes 3111 according to the use needs, which is not specifically limited here. For example, a plurality of second cyclone vanes 3211 are arranged in a ring in a clockwise or counterclockwise direction, wherein the ring arrangement direction of the second cyclone vanes 3211 is the same as that of the first cyclone vanes 3111. One end of the second cyclone vane 3211 abuts against the dust removal shell 100, the other end of the second cyclone vane 3211 abuts against the inlet pipe section 210, and the second cyclone vane 3211 is arranged obliquely to the radial direction of the dust removal shell 100.

[0059] In the embodiments of the utility model, as shown in the embodiments, Figure 4 The stop dust removal mechanism 330 includes a perforated baffle 331 arranged between the inlet pipe section 210 and the dust removal shell 100.

[0060] Since the flow rate of the converter gas after passing through the second cyclone dust removal mechanism 320 is high, by arranging the perforated baffle 331 above the second cyclone dust removal mechanism 320, the converter gas can pass through the through holes on the perforated baffle 331, and the dust in the converter gas that rebounds from the outer wall of the inlet pipe section 210 will be blocked by the perforated baffle 331. With the decrease of the kinetic energy of the rebounding particles, the particles will settle to the lower dust hopper 120 under the action of gravity, thereby further reducing dust escape.

[0061] In addition, the converter gas after dust removal by the perforated baffle 331 will continue to move upward and can be discharged from the gas outlet 110 to enter the subsequent fine dust removal device.

[0062] The designer can adjust the specific structure of the perforated baffle 331 according to the use needs, which is not specifically limited here. Preferably, the perforated baffle 331 is arranged on the inlet pipe section 210, and the end of the perforated baffle 331 away from the inlet pipe section 210 is arranged obliquely downward.

[0063] By setting the porous baffle 331 obliquely, the oblique porous baffle 331 can further optimize the trapping effect of rebounding particle dust. Moreover, the oblique porous baffle 331 helps to reduce dust accumulation, so that the captured dust is more easily slid along the surface of the porous baffle 331 into the dust hopper 120, thereby avoiding the problem of secondary dust raising and helping to reduce the frequency of dust cleaning.

[0064] In the embodiments of the utility model, as shown in the embodiments shown in the utility model, the multi-stage dust removal device further comprises a dust cleaning mechanism 400, and the dust cleaning mechanism 400 is arranged at the upper portion of the dust removal shell 100. Figure 1 Figure 5 As shown in the embodiments shown in the utility model, the multi-stage dust removal device further comprises a dust cleaning mechanism 400, and the dust cleaning mechanism 400 is arranged at the upper portion of the dust removal shell 100.

[0065] By arranging the dust cleaning mechanism 400 at the upper portion of the dust removal shell 100, the dust cleaning mechanism 400 can effectively solve the problem of dust adhesion and accumulation on the surface of the dust removal shell 100 during the dust removal process.

[0066] Moreover, the deposited dust can be periodically removed by the dust cleaning mechanism 400, preventing the problem of secondary dust raising or blockage caused by dust accumulation, thereby guaranteeing the dust removal effect of the multi-stage dust removal device and helping to reduce the maintenance frequency and operation cost of the multi-stage dust removal device.

[0067] Specifically, the dust cleaning mechanism 400 comprises at least one acoustic dust cleaning device 410, and the acoustic dust cleaning device 410 is arranged at the upper portion of the dust removal shell 100.

[0068] Preferably, a plurality of acoustic dust cleaning devices 410 are arranged, and the plurality of acoustic dust cleaning devices 410 are arranged in a ring at the upper portion of the dust removal shell 100 and above the gas outlet 110.

[0069] The plurality of acoustic dust cleaning devices 410 cooperate to generate high-frequency vibration, so that the adhesion between the dust particles and the adhering surface is significantly reduced, thereby helping to achieve a contactless and all-around dust cleaning effect.

[0070] Specifically, during the intermittent period of the converter smelting, there is no flue gas or only a small amount of air passing through the multi-stage dust removal device, and the flue gas flow rate in the dust removal shell 100 is extremely low, so the acoustic dust cleaning device 410 can be turned on to remove the dust adhered to the porous baffle 331, the first cyclone dust removal mechanism 310 and the second cyclone dust removal mechanism 320.

[0071] Compared with the traditional mechanical or pneumatic dust cleaning method, the utility model has the advantages of low energy consumption, no secondary dust raising, simple maintenance, etc., which helps to improve the dust removal efficiency of the multi-stage dust removal device, effectively prolongs the operation cycle and service life of the equipment, and further improves the stability and economy of the multi-stage dust removal device.

[0072] ​All articles and references, including patent applications and publications, disclosed herein are hereby incorporated by reference for all purposes. The term "consisting essentially of to describe a combination shall include the elements, ingredients, components or steps identified, and such other elements, ingredients, components or steps that do not materially affect the basic and novel characteristics of the combination. The use of the term "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also is taken to mean that other elements, ingredients, components or steps are optional, and not excluded. The term "may" is intended to mean one or more possible values of a described property. Multiple elements, ingredients, components or steps can be provided by a single integrated element, ingredient, component or step. Alternatively, a single integrated element, ingredient, component or step might be divided into separate plural elements, ingredients, components or steps. To "comprise" or "comprising" or "include" or "including" something means the thing can be an essential part of the generic class, but it is not exclusive. Some embodiments of the application can consist of different elements, ingredients, components or steps.

[0073] The embodiments in the specification are described in progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A multi-stage dust removal device, characterized in that, include: A dust collector housing, the dust collector housing including a dust collector chamber and an air outlet communicating with the dust collector chamber; An input pipe is inserted into the dust collector housing and communicates with the dust collector chamber. The gap between the input pipe and the dust collector housing forms a filter channel, which communicates with the air outlet. A multi-stage dust removal assembly, comprising a first cyclone dust removal mechanism, a second cyclone dust removal mechanism, and a stop dust removal mechanism arranged at intervals in the filter channel from bottom to top.

2. The multi-stage dust removal device as described in claim 1, characterized in that, The input pipe includes an inlet pipe section, a reducing pipe section, and a downcomer pipe section connected together, wherein the radial dimension of the inlet pipe section is larger than the radial dimension of the downcomer pipe section.

3. The multi-stage dust removal device as described in claim 2, characterized in that, The first cyclone dust removal mechanism is disposed between the downcomer pipe section and the dust removal housing, and the second cyclone dust removal mechanism and the stop dust removal mechanism are disposed between the inlet pipe section and the dust removal housing.

4. The multi-stage dust removal device as described in claim 2, characterized in that, The first cyclone dust removal mechanism includes a first cyclone separator disposed between the downcomer section and the dust removal housing, the first cyclone separator including a plurality of first cyclone blades spaced around the downcomer section.

5. The multi-stage dust removal device as described in claim 2, characterized in that, The second cyclone dust removal mechanism includes a second cyclone separator disposed between the inlet pipe section and the dust removal housing, the second cyclone separator including a plurality of second cyclone blades spaced around the inlet pipe section.

6. The multi-stage dust removal device as described in claim 2, characterized in that, The dust removal and blocking mechanism includes a porous baffle disposed between the inlet pipe section and the dust removal housing.

7. The multi-stage dust removal device as described in claim 6, characterized in that, The perforated baffle is disposed on the inlet pipe section, with the end of the perforated baffle away from the inlet pipe section inclined downwards.

8. The multi-stage dust removal device as described in claim 1, characterized in that, The multi-stage dust removal device also includes a dust removal mechanism, which is located on the upper part of the dust removal housing.

9. The multi-stage dust removal device as described in claim 8, characterized in that, The dust removal mechanism includes at least one acoustic dust removal device, which is disposed on the upper part of the dust removal housing.

10. The multi-stage dust removal device as described in claim 1, characterized in that, The bottom of the dust collector housing is equipped with a dust collection hopper.

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