CN219744272U - Dust removing device - Google Patents

Abstract

The utility model provides a dust removal device, comprising: the dust removing pipe is provided with a gas inlet, a gas outlet and a dust removing channel communicated with the gas inlet and the gas outlet; the first dust content detection piece is provided with a detection part at the gas outlet so as to detect the gas dust content at the gas outlet through the first dust content detection piece; the air inlet part of the reflux structure is communicated with the air outlet, and the air outlet part is communicated with the dust removal channel; the first dust content detection piece has a first preset detection value; when the first dust content detection part detects that the gas dust content of the gas outlet is larger than a first preset detection value, the gas outlet is communicated with the gas inlet part of the backflow structure; when the dust content of the gas is smaller than or equal to a first preset detection value, the gas outlet is used for discharging the gas. By adopting the technical scheme provided by the utility model, the problem of poor dust removal effect of the dust removal device in the prior art can be solved.

Description

Dust removing device

Technical Field

The utility model relates to the technical field of dust removal devices, in particular to a dust removal device.

Background

At present, a great amount of non-condensable gas is generated in the thermal phase separation treatment process of the oily waste, and the non-condensing component is also greatly changed along with the component change of the oily waste. Therefore, the non-condensing gas needs to be subjected to impurity removal before entering the next link, so as to ensure that the particulate matters contained in the non-condensing gas meet the discharge requirement.

However, in the prior art, only one treatment process and one air outlet are usually provided in the dust removing device, and after the non-condensing air passes through the dust removing device, no matter whether the particulate matters contained in the non-condensing air meet the requirements or not, the particulate matters directly enter the next link through the single air outlet. Therefore, the treatment effect of the dust removing device on the particulate matters in the non-condensing steam cannot be guaranteed, and the dust removing effect of the dust removing device is poor.

Disclosure of Invention

The utility model mainly aims to provide a dust removing device so as to solve the problem of poor dust removing effect of the dust removing device in the prior art.

In order to achieve the above object, the present utility model provides a dust removing apparatus comprising:

the dust removing pipe is provided with a gas inlet, a gas outlet and a dust removing channel communicated with the gas inlet and the gas outlet;

the first dust content detection piece is provided with a detection part at the gas outlet so as to detect the gas dust content at the gas outlet through the first dust content detection piece;

the air inlet part of the reflux structure is communicated with the air outlet, and the air outlet part of the reflux structure is communicated with the dust removal channel;

the first dust content detection piece has a first preset detection value; when the first dust content detection part detects that the gas dust content of the gas outlet is larger than a first preset detection value, the gas outlet is communicated with the gas inlet part of the backflow structure; when the gas dust content of the gas outlet detected by the first dust content detecting piece is smaller than or equal to a first preset detection value, the gas outlet is used for discharging the gas.

Further, the first dust content detection member has a second preset detection value, and the second preset detection value is larger than the first preset detection value; the air inlet portion of the reflux structure comprises a first air inlet and a second air inlet, the air outlet portion of the reflux structure comprises a first air outlet and a second air outlet, and the reflux structure comprises:

the two ends of the first backflow pipeline are respectively provided with a first air inlet and a first air outlet, the first backflow pipeline is positioned in the dust removal pipe, and the first backflow pipeline is arranged at intervals with the dust removal channel;

the two ends of the second backflow pipeline are respectively provided with a second air inlet and a second air outlet, and the second backflow pipeline is positioned outside the dust removal pipe;

when the first dust content detection part detects that the gas dust content of the gas outlet is larger than a second preset detection value, the gas outlet is communicated with the second backflow pipeline; when the first dust content detection part detects that the gas dust content of the gas outlet is smaller than or equal to a second preset detection value, the gas outlet is communicated with the first backflow pipeline.

Further, the tube side of the second return pipeline is larger than that of the first return pipeline; and/or the number of the groups of groups,

the heat exchange structure is in contact with or attached to the second backflow pipeline and is provided with a heat exchange channel, and the temperature of a heat exchange medium in the heat exchange channel is lower than that of gas in the second backflow pipeline.

Further, the dust removal pipe is double-deck tubular construction, and double-deck tubular construction is including the interval setting inner tube and outer tube, and the inner tube encloses into dust removal passageway, forms first return conduit between inner tube and the outer tube, and first return conduit is close to the one end of gas outlet and forms first air inlet, and first return conduit is kept away from the one end of gas outlet and forms first gas outlet.

Further, the dust removing device further includes:

and the shape of the cleaning ring is matched with that of the first backflow pipeline, and the cleaning ring is movably arranged in the first backflow pipeline so as to scrape dust on the pipeline wall of the first backflow pipeline through the cleaning ring.

Further, the dust removing device further includes:

the first one-way valve is arranged at the gas outlet so that the gas at the gas outlet can be discharged through the first one-way valve; and/or the number of the groups of groups,

the second one-way valve is arranged at the first air inlet so that the air at the air outlet is communicated with the first air inlet through the second one-way valve; and/or the number of the groups of groups,

and the third one-way valve is arranged at the second air inlet so that the air at the air outlet is communicated with the second air inlet through the third one-way valve.

Further, the dust removing device further includes:

the first blocking piece is movably arranged at the gas inlet so as to block or open the gas inlet;

the second blocking piece is movably arranged at the gas outlet so as to block or open the gas outlet;

the third blocking piece is movably arranged at the second air outlet so as to block or open the second air outlet.

Further, the dust removing device further includes:

a first temperature detecting member, a detecting portion of the first temperature detecting member being provided at the gas outlet,

the detection part of the second temperature detection part extends into the dust removal channel, and the detection part of the second temperature detection part is arranged at intervals with the detection part of the first temperature detection part;

wherein the dust removing channel has a preset temperature value; when the temperature value detected by at least one of the first temperature detecting piece and the second temperature detecting piece is larger than a preset temperature value, the gas inlet is plugged through the first plugging piece, the gas outlet is plugged through the second plugging piece, and the second gas outlet is plugged through the third plugging piece.

Further, a cleaning port is arranged on the dust removal pipe and communicated with the dust removal channel so as to introduce cleaning medium into the dust removal channel through the cleaning port; the dust removing device further includes:

the fourth blocking piece is movably arranged at the cleaning opening so as to block or open the cleaning opening;

when the temperature value detected by at least one of the first temperature detecting piece and the second temperature detecting piece is larger than a preset temperature value, the cleaning opening is plugged through the fourth plugging piece.

Further, the dust removing device further includes:

the dust removing structure is rotatably arranged in the dust removing channel;

the second dust content detection part is arranged at the gas inlet;

the control piece, dust removal structure and second dust content detection piece are all connected with the control piece to make the control piece adjust dust removal structure's rotational speed according to the gaseous dust content that the second dust content detection piece detected.

By adopting the technical scheme of the utility model, the first dust content detection part is arranged in the dust removal device to detect the dust content of the gas passing through the dust removal channel, and the gas is directly discharged through the gas outlet or flows into the reflux structure to be treated and discharged according to the detected dust content, so that the condition that the particulate matters contained in the gas are still discharged when the particulate matters do not meet the requirements can be avoided, the dust removal effect of the dust removal device can be ensured and improved, and the problem of poor dust removal effect of the dust removal device in the prior art can be solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 is a schematic cross-sectional view showing a dust removing device according to an embodiment of the present utility model;

fig. 2 shows a top view of a dust removing device provided according to an embodiment of the present utility model;

fig. 3 shows an enlarged schematic view of a partial structure at a.

Wherein the above figures include the following reference numerals:

10. a dust removal pipe; 11. a gas inlet; 12. a gas outlet; 13. a dust removal channel; 14. an inner tube; 15. an outer tube; 16. cleaning the mouth; 17. an external circulation manifold;

21. a first dust content detecting member;

30. a reflow structure; 31. a first air inlet; 32. a second air inlet; 33. a first air outlet; 34. a second air outlet; 35. a first return line; 40. a cleaning ring;

51. a first blocking member; 52. a second blocking member; 53. a third blocking member; 54. a fourth blocking member;

61. a first temperature detecting member; 62. a second temperature detecting member; 70. dust removal structure.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Referring to fig. 1 to 3, in an embodiment of the present utility model, there is provided a dust removing apparatus including a dust removing pipe 10, a first dust content detecting member 21, and a return structure 30. The dust removing pipe 10 has a gas inlet 11, a gas outlet 12, and a dust removing passage 13 communicating with both the gas inlet 11 and the gas outlet 12. The detection portion of the first dust content detection member 21 is provided at the gas outlet 12 to detect the gas dust content at the gas outlet 12 by the first dust content detection member 21. The air inlet of the reflux structure 30 is used for communicating with the air outlet 12, and the air outlet of the reflux structure 30 is communicated with the dust removing channel 13. Wherein the first dust content detecting member 21 has a first preset detection value; when the first dust content detecting member 21 detects that the gas dust content of the gas outlet 12 is greater than the first preset detection value, the gas outlet 12 communicates with the gas inlet portion of the return structure 30; when the gas dust content of the gas outlet 12 detected by the first dust content detecting member 21 is less than or equal to a first preset detection value, the gas outlet 12 is used for discharging the gas.

With such an arrangement, the first dust content detecting member 21 is provided at the gas outlet 12, so that it is possible to detect the gas after passing through the dust removing passage 13, and when the first dust content detecting member 21 detects that the dust content is greater than the first preset detection value, the gas passes through the return structure 30 and returns to the dust removing passage 13 to complete dust removal again. Therefore, the dust removal effect of the dust removal device can be effectively guaranteed, and the problem that the dust removal effect of the dust removal device in the prior art is poor can be solved.

In the present embodiment, the first dust content detecting member 21 further has a second preset detection value, which is larger than the first preset detection value. The air inlet portion of the return structure 30 includes a first air inlet 31 and a second air inlet 32, and the air outlet portion of the return structure 30 includes a first air outlet 33 and a second air outlet 34. The return structure 30 further comprises a first return conduit 35 and a second return conduit. The two ends of the first return pipeline 35 are respectively provided with a first air inlet 31 and a first air outlet 33, the first return pipeline 35 is positioned in the dust removal pipe 10, and the first return pipeline 35 and the dust removal channel 13 are arranged at intervals. The second return line has two ends respectively forming a second air inlet 32 and a second air outlet 34, and is located outside the dust removing pipe 10. Wherein when the first dust content detecting member 21 detects that the gas dust content of the gas outlet 12 is greater than the second preset detection value, the gas outlet 12 communicates with the second return pipe; when the first dust content detecting member 21 detects that the gas dust content of the gas outlet 12 is less than or equal to the second preset detection value, the gas outlet 12 communicates with the first return duct 35. By adopting the arrangement, two different backflow pipelines can be selected according to the numerical range of different dust contents detected by the first dust content detection piece 21, when the dust content is smaller, gas can pass through the first backflow pipeline 35, and when the dust content is larger, gas can pass through the second backflow pipeline outside the dust removal pipe 10, so that the dust removal effect of the dust removal device can be improved, external backflow can be selected according to actual requirements, and the efficiency of the dust removal device can be further ensured.

Specifically, the tube side of the second return pipe is greater than the tube side of the first return pipe 35, and by adopting such a setting, the gas with different dust contents can be treated by arranging two return pipes with different tube sides, so that different dust removal requirements of the dust removal device can be met.

Alternatively, the dust removing device may further include a heat exchanging structure. The heat exchange structure is in contact with or attached to the second backflow pipeline and is provided with a heat exchange channel, and the temperature of a heat exchange medium in the heat exchange channel is lower than that of gas in the second backflow pipeline. By adopting the arrangement, the dust removal effect of the second return pipeline can be further improved by a low-temperature dust removal mode.

Still alternatively, the heat exchanging structure may be provided in contact with or attached to the second return pipe while the second return pipe is set to be larger than the first return pipe 35. By adopting the arrangement, the dust removal effect of the second return pipeline can be improved to the greatest extent while different dust removal requirements are met, so that the dust removal effect of the dust removal device is further ensured.

In this embodiment, the dust removing tube 10 is a double-layer tube structure, the double-layer tube structure includes an inner tube 14 and an outer tube 15 disposed at intervals, the inner tube 14 encloses into a dust removing channel 13, a first backflow pipeline 35 is formed between the inner tube 14 and the outer tube 15, one end of the first backflow pipeline 35 close to the gas outlet 12 forms a first gas inlet 31, and one end of the first backflow pipeline 35 far away from the gas outlet 12 forms a first gas outlet 33. By providing the first return duct 35 inside the dust removal pipe 10 in this manner, the first return duct 35 having a short path and inside the dust removal pipe can be selected without passing through the external second return duct when the dust content is small, and the efficiency of gas treatment can be improved.

Specifically, the dust removing device further includes a cleaning ring 40. The shape of the cleaning ring 40 is adapted to the shape of the first return duct 35, the cleaning ring 40 being movably arranged in the first return duct 35 for scraping off dust from the duct wall of the first return duct 35 by the cleaning ring 40. With such an arrangement, when the first return duct 35 needs cleaning, scraping of the duct wall of the first return duct 35 by the cleaning ring 40 can be achieved by providing a driving structure for driving the cleaning ring 40 on the dust removing device and bringing the cleaning ring 40 into motion. In this way, the interior of the first return pipe 35 can be kept clean, and the dust removal effect of the dust removal device can be further ensured.

Wherein, since the first return pipe 35 is communicated with the gas inlet 11, and the gas inlet 11 is communicated with the thermal phase separation device in the previous process, dust can be scraped to the gas inlet 11 by the cleaning ring 40 and then falls back into the internal thermal phase separation device from the gas inlet 11, so that the dust in the dust removing device can be discharged by periodically opening the thermal phase separation device.

In this embodiment, the dust removing device further includes a first check valve; the first one-way valve is provided at the gas outlet 12 so that the gas at the gas outlet 12 is discharged through the first one-way valve. Alternatively, the dust removing device may further include a second check valve; the second one-way valve is provided at the first gas inlet 31 so that the gas at the gas outlet 12 communicates with the first gas inlet 31 through the second one-way valve. Alternatively, the dust removing device may further include a third check valve; the third one-way valve is provided at the second gas inlet 32 such that the gas at the gas outlet 12 communicates with the second gas inlet 32 through the third one-way valve. Still alternatively, dust collector can also include first check valve, second check valve and third check valve simultaneously, adopts such setting to be through opening the three check valves of the different passageway of intercommunication to realize the gaseous processing demand of different dust contents through different processing route, can be convenient for more switch between the different emission passageway, thereby further promoted dust collector's dust removal effect and dust collection efficiency.

Specifically, the dust removing device further includes a first blocking member 51, a second blocking member 52, and a third blocking member 53. The first blocking member 51 is movably provided at the gas inlet 11 to block or open the gas inlet 11. A second closure 52 is movably disposed at the gas outlet 12 to close or open the gas outlet 12. The third blocking member 53 is movably disposed at the second air outlet 34 to block or open the second air outlet 34. With such a configuration, when a certain channel needs to be closed, the closing of the gas inlet 11, the gas outlet 12 and the second gas outlet 34 can be correspondingly completed by operating the first blocking member 51, the second blocking member 52 and the third blocking member 53, thereby ensuring that the dust removing device can close the channel according to actual needs.

In this embodiment, the dust removing device further includes a first temperature detecting member 61 and a second temperature detecting member 62, the detecting portion of the first temperature detecting member 61 is disposed at the gas outlet 12, the detecting portion of the second temperature detecting member 62 extends into the dust removing channel 13, and the detecting portion of the second temperature detecting member 62 is disposed at a distance from the detecting portion of the first temperature detecting member 61. Wherein the dust removal channel 13 has a preset temperature value; when the temperature value detected by at least one of the first temperature detecting member 61 and the second temperature detecting member 62 is greater than the preset temperature value, the gas inlet 11 is blocked by the first blocking member 51, the gas outlet 12 is blocked by the second blocking member 52, and the second gas outlet 34 is blocked by the third blocking member 53. By adopting the arrangement, the channel which is communicated with the outside of the dust removing system can be closed when at least one of the first temperature detecting piece 61 and the second temperature detecting piece 62 detects that the temperature is higher, and the anoxic environment is formed inside the dust removing device to block the formation of flame or the spread of fire, so that the operation safety and stability of the dust removing device can be ensured, and the safety and the reliability of the dust removing device are further improved.

Specifically, the dust removal pipe 10 is provided with a cleaning port 16, and the cleaning port 16 is communicated with the dust removal channel 13 so as to introduce cleaning medium into the dust removal channel 13 through the cleaning port 16. The dust removing device further includes a fourth blocking member 54, and the fourth blocking member 54 is movably disposed at the cleaning opening 16 to block or open the cleaning opening 16. Wherein, when the temperature value detected by at least one of the first temperature detecting member 61 and the second temperature detecting member 62 is greater than the preset temperature value, the cleaning opening 16 is blocked by the fourth blocking member 54. By adopting the arrangement, the cleaning effect can be realized by regularly introducing the cleaning medium into the dust removal pipe 10 through the cleaning opening 16, the cleaning of the inside of the dust removal pipe 10 can be further ensured, and meanwhile, the fourth blocking piece 54 can block the cleaning opening 16 when the temperature is too high, so that the safety and the reliability of the dust removal device are further ensured.

In this embodiment, the dust removing device further includes a dust removing structure 70, a second dust content detecting member, and a control member. The dust removing structure 70 is rotatably arranged in the dust removing channel 13, the second dust content detecting member is arranged at the gas inlet 11, and the dust removing structure 70 and the second dust content detecting member are both connected with the control member, so that the control member can adjust the rotating speed of the dust removing structure 70 according to the gas dust content detected by the second dust content detecting member. By adopting the arrangement, the dust content of the gas actually entering the dust removing device can be detected through the second dust content detecting piece, the rotating speed of the internal dust removing structure 70 is correspondingly regulated, the dust removing structure 70 can be enabled to operate at a high rotating speed without any time while the efficiency of the dust removing device is ensured, and further the operation cost of the dust removing device can be reduced to a certain extent, and the service life of the dust removing structure 70 is prolonged.

In this embodiment, the dust-containing non-condensing gas enters the dust removing device through the gas inlet 11, and the dust removing structure 70 of the dust removing device continuously rotates vertically and obliquely in a spiral manner to remove dust from the dust-containing gas. When the treated gas reaches the gas outlet 12 at the tail of the dust removing apparatus, the first dust content detecting member 21 detects the dust content of the gas and outputs a data signal. The data signal is transmitted to the first check valve, the third check valve and the second check valve. When the dust content of the gas accords with a first preset detection value, the gas is directly discharged out of the direct gas outlet 12 through the first one-way valve and enters the next disposal link; if the dust content of the gas is higher than the second preset detection value, the gas enters a third one-way valve; if the dust content of the gas is higher than the first preset detection value and lower than the second preset detection value, the gas enters the second one-way valve. If the dust content of the gas does not meet the emission requirement, the gas is recycled until reaching the standard and is directly discharged.

Specifically, if the dust content of the gas is higher than the second preset detection value, the gas enters the third one-way valve, the third one-way valve and the second air inlet 32 form a loop, the loop is cooled by air or an external cooling medium, and the low-temperature dust-containing gas enters the dust removing device again through the external circulation manifold 17 to realize secondary dust removal. If the dust content of the gas is higher than the first preset detection value and lower than the second preset detection value, the gas enters the first backflow pipeline 35 of the inner annular cavity structure through the second one-way valve and enters the dust removal pipe 10 so as to remove dust again from the gas. The dust removing device is also internally provided with a cleaning ring 40 and a cleaning port 16, and the cleaning ring 40 can realize the periodic cleaning of the first return pipeline 35; the purge port 16 may be purged thoroughly by periodically introducing nitrogen or other purge medium.

In the present embodiment, the first temperature detecting member 61 and the second temperature detecting member 62 are provided to detect the gas temperature at the gas outlet 12 and the gas inlet 11, respectively, in real time, and when the temperature exceeds a preset temperature value, the emergency shutdown of the dust removing apparatus is performed to protect the equipment. When the first temperature detecting piece 61 and the second temperature detecting piece 62 detect the overtemperature, the flanges of the first one-way valve, the outer circulation manifold 17, the gas inlet 11 and the cleaning port 16 are all closed automatically, and an anoxic state is formed in the space to block the gas combustion, so that the dust removing device is protected from being burnt.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects: through setting up first dust content detection spare 21 in dust collector's gas outlet 12 department to judge whether need carry out the dust removal again through reflux structure 30 and discharge again according to the gas dust content that gas outlet 12 detected, can effectively guarantee dust collector's dust removal effect, thereby can solve the relatively poor problem of dust collector's dust removal effect among the prior art.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A dust removing apparatus, comprising:

a dust removal pipe (10), wherein the dust removal pipe (10) is provided with a gas inlet (11), a gas outlet (12) and a dust removal channel (13) communicated with the gas inlet (11) and the gas outlet (12);

a first dust content detection member (21), a detection portion of the first dust content detection member (21) being provided at the gas outlet (12) to detect a gas dust content at the gas outlet (12) by the first dust content detection member (21);

the air inlet part of the reflux structure (30) is used for being communicated with the air outlet (12), and the air outlet part of the reflux structure (30) is communicated with the dust removing channel (13);

wherein the first dust content detection member (21) has a first preset detection value; when the first dust content detection piece (21) detects that the gas dust content of the gas outlet (12) is larger than the first preset detection value, the gas outlet (12) is communicated with the gas inlet part of the backflow structure (30); when the gas dust content of the gas outlet (12) detected by the first dust content detection piece (21) is smaller than or equal to the first preset detection value, the gas outlet (12) is used for discharging the gas.

2. The dust removal device according to claim 1, wherein the first dust content detection member (21) has a second preset detection value, which is larger than the first preset detection value; the air inlet part of the reflux structure (30) comprises a first air inlet (31) and a second air inlet (32), the air outlet part of the reflux structure (30) comprises a first air outlet (33) and a second air outlet (34), and the reflux structure (30) comprises:

the first backflow pipeline (35), two ends of the first backflow pipeline (35) respectively form the first air inlet (31) and the first air outlet (33), the first backflow pipeline (35) is positioned in the dust removal pipe (10), and the first backflow pipeline (35) and the dust removal channel (13) are arranged at intervals;

the two ends of the second backflow pipeline are respectively provided with the second air inlet (32) and the second air outlet (34), and the second backflow pipeline is positioned outside the dust removal pipe (10);

wherein when the first dust content detection member (21) detects that the gas dust content of the gas outlet (12) is greater than the second preset detection value, the gas outlet (12) is communicated with the second return pipe; when the first dust content detection part (21) detects that the gas dust content of the gas outlet (12) is smaller than or equal to the second preset detection value and larger than a first preset detection value, the gas outlet (12) is communicated with the first backflow pipeline (35).

3. A dust removing device as set forth in claim 2, wherein,

the tube side of the second return pipeline is larger than that of the first return pipeline (35); and/or the number of the groups of groups,

the heat exchange structure is in contact with or attached to the second backflow pipeline, the heat exchange structure is provided with a heat exchange channel, and the temperature of a heat exchange medium in the heat exchange channel is lower than that of gas in the second backflow pipeline.

4. The dust removal device according to claim 2, wherein the dust removal pipe (10) is of a double-layer pipe structure, the double-layer pipe structure comprises an inner pipe (14) and an outer pipe (15) which are arranged at intervals, the inner pipe (14) encloses the dust removal channel (13), a first backflow pipeline (35) is formed between the inner pipe (14) and the outer pipe (15), one end of the first backflow pipeline (35) close to the gas outlet (12) forms the first gas inlet (31), and one end of the first backflow pipeline (35) away from the gas outlet (12) forms the first gas outlet (33).

5. The dust removing apparatus according to claim 4, further comprising:

-a cleaning ring (40), the shape of the cleaning ring (40) being adapted to the shape of the first return duct (35), the cleaning ring (40) being movably arranged in the first return duct (35) for scraping off dust on the duct wall of the first return duct (35) by the cleaning ring (40).

6. The dust removing apparatus according to claim 2, further comprising:

a first one-way valve provided at the gas outlet (12) so that the gas at the gas outlet (12) is discharged through the first one-way valve; and/or the number of the groups of groups,

a second one-way valve provided at the first gas inlet (31) so that the gas at the gas outlet (12) communicates with the first gas inlet (31) through the second one-way valve; and/or the number of the groups of groups,

and a third one-way valve provided at the second gas inlet (32) so that the gas at the gas outlet (12) communicates with the second gas inlet (32) through the third one-way valve.

7. The dust removing apparatus according to claim 2, further comprising:

a first blocking member (51) movably provided at the gas inlet (11) to block or open the gas inlet (11);

a second blocking member (52) movably provided at the gas outlet (12) to block or open the gas outlet (12);

and a third blocking piece (53) which is movably arranged at the second air outlet (34) so as to block or open the second air outlet (34).

8. The dust removing apparatus according to claim 7, further comprising:

a first temperature detecting member (61), a detecting portion of the first temperature detecting member (61) being provided at the gas outlet (12),

a second temperature detecting member (62), wherein a detecting portion of the second temperature detecting member (62) extends into the dust removing channel (13), and the detecting portion of the second temperature detecting member (62) is arranged at a distance from the detecting portion of the first temperature detecting member (61);

wherein the dust removal channel (13) has a preset temperature value; when the temperature value detected by at least one of the first temperature detecting member (61) and the second temperature detecting member (62) is greater than the preset temperature value, the gas inlet (11) is blocked by the first blocking member (51), the gas outlet (12) is blocked by the second blocking member (52), and the second gas outlet (34) is blocked by the third blocking member (53).

9. The dust removal device according to claim 8, characterized in that a cleaning opening (16) is provided on the dust removal pipe (10), the cleaning opening (16) being in communication with the dust removal channel (13) for introducing a cleaning medium into the dust removal channel (13) through the cleaning opening (16); the dust removing device further includes:

a fourth blocking member (54) movably provided at the cleaning port (16) to block or open the cleaning port (16);

wherein when the temperature value detected by at least one of the first temperature detecting member (61) and the second temperature detecting member (62) is greater than the preset temperature value, the cleaning port (16) is plugged by the fourth plugging member (54).

10. The dust removing apparatus according to claim 1, further comprising:

a dust removal structure (70), the dust removal structure (70) being rotatably arranged within the dust removal channel (13);

a second dust content detection member provided at the gas inlet (11);

the dust removing structure (70) and the second dust content detecting piece are connected with the control piece, so that the control piece can adjust the rotating speed of the dust removing structure (70) according to the gas dust content detected by the second dust content detecting piece.