CN110841415A - Dust centralized collection device and dust centralized collection method - Google Patents

Abstract

The present disclosure provides a dust centralized collection device and a dust centralized collection method. The dust centralized collection device includes at least one dust collector. The dust collector includes a dust collector body, a dust discharge pipe and a dust collector air inlet pipe. The dust discharge pipe and the dust collector air inlet pipe are respectively connected with the dust collector body. At least one dust collector includes The first dust collector; the gas-material separator, including the gas-material separator body, the air inlet, the air outlet and the discharge port; the dust collection air duct, including the dust collection port and the dust discharge port, the dust collection port and the dust discharge of the dust collector The dust discharge port is connected with the air inlet of the gas-material separator; the return air pipe includes an input port and an output port, the input port is connected with the air outlet of the gas-material separator, and the output port is connected with the dust collector inlet of the first dust collector. The air duct is connected; and the dust removal fan, the air inlet end of which is connected with the exhaust duct of the first dust collector. The present disclosure solves the problems of dust sticking and breeding of tobacco insects in the centralized dust collection device by adopting a wind-powered centralized collection method including multiple dust removal of gas and material separation.

Description

Dust centralized collection device and dust centralized collection method

technical field

The present disclosure relates to the technical field of tobacco machinery, in particular to a dust centralized collection device and a dust centralized collection method.

Background technique

In the process of cigarette production and processing, many processes generate a large amount of tobacco dust due to the crushing of materials. These dusts are collected by the dust removal system to the dust treatment equipment. Collect and process the dust collected by multiple dust removal systems in a centralized manner.

Current tobacco dust centralized collection devices often use screw conveyors as dust conveying equipment. However, the above devices still have the following problems: a large amount of dust sticks on the pipe wall after use, which is easy to breed tobacco insects; the layout flexibility of the whole device is poor, and the floor space is large; when the number of dust collectors in the device is large, the screw conveyor The length is longer, the equipment failure rate is higher; the manufacturing cost of the screw conveyor is higher, and the installation and maintenance are more difficult.

SUMMARY OF THE INVENTION

The purpose of the present disclosure is to provide a centralized dust collection device and a method for centralized collection of dust, so as to improve the problems such as dust adhesion of conveying equipment generated during the centralized collection of dust.

A first aspect of the present disclosure provides a centralized dust collection device, including:

At least one dust collector, the dust collector includes a dust collector body, a dust discharge pipe and a dust collector air inlet pipe, the dust discharge pipe and the dust collector air inlet pipe are respectively connected with the dust collector body, the at least one dust collector The precipitator includes a first precipitator, and the first precipitator further includes an exhaust pipe;

an air-material separator, the air-material separator includes a gas-material separator body, an air inlet, an air outlet and a discharge port, and the air inlet, the air outlet and the discharge port are connected with the air-material separator body;

A dust collection air duct, the dust collection air duct includes a dust collection port and a dust discharge port, the dust collection port of the dust collection air duct is connected with the dust discharge pipe of the dust collector, and the dust discharge pipe of the dust collection air duct is The port is connected with the air inlet of the gas-material separator;

A return air duct, the return air duct includes an input port and an output port, the input port of the return air duct is connected to the air outlet of the gas-material separator, and the output port of the return air duct is connected to the first dust collector the dust collector inlet duct connection of the dust collector; and

A dust removal fan, the air inlet end of the dust removal fan is connected with the exhaust pipe of the first dust collector.

According to some embodiments of the present disclosure, the at least one precipitator further includes a second precipitator, and the precipitator air inlet duct of the second precipitator is isolated from the output port of the return air duct.

According to some embodiments of the present disclosure, the dust collector includes an ash discharge valve disposed at the bottom of the dust collector body, and the dust discharge pipe is connected to the dust discharge valve and extends downward from the dust discharge valve to The dust collection port of the dust collection air duct.

According to some embodiments of the present disclosure, the gas feed separator includes a cyclone or a settling box.

According to some embodiments of the present disclosure, the dust centralized collection device includes a dust processing device connected to the discharge port of the gas-material separator.

According to some embodiments of the present disclosure, the dust processing equipment includes a rod press machine, the rod press machine includes a dust collecting box and a rod pressing machine body, and a feed port of the dust collecting box is connected to the air-material separator. Discharge port connection.

According to some embodiments of the present disclosure, the gas-material separator further includes a drop pipe and an air lock disposed between the gas-material separator body and the drop-off pipe, and the discharge port is the The outlet of the blanking pipe, the gas separator body, the air lock, the blanking pipe and the dust collecting box are arranged in sequence from top to bottom.

According to some embodiments of the present disclosure, the dust collection air duct includes a supplementary air port and a filter screen, and all the dust collection ports of the dust collection air duct are arranged between the supplementary air port and the dust discharge port, so The filter screen is arranged at the air supply port, and is used for filtering the air for conveying dust.

According to some embodiments of the present disclosure, the centralized dust collection device further includes a wind speed detection device disposed on the straight pipe section of the return air pipe, and the wind speed detection device includes at least one of an online anemometer and a wind speed detection port; Wherein, the online anemometer is used to automatically measure the wind speed in the return air duct, and the wind speed detection port is used to manually measure the wind speed in the return air duct.

According to some embodiments of the present disclosure, the dust centralized collection device further includes an air volume regulating valve disposed on the return air duct, and the air volume regulating valve is used to adjust the air volume in the return air duct.

A second aspect of the present disclosure provides a centralized dust collection method, comprising:

start at least one dust collector including the first dust collector;

The dust discharged from the activated at least one dust collector is collectively transported through the dust collecting air duct to the gas material separator;

The dust-containing air is separated by the gas-material separator to obtain the dust to be treated and the air subjected to rough dust removal; and

Collect the separated dust to be treated, convey the separated and dedusted air through the return air pipe to the first dust collector for further dedusting, and discharge the further dedusted clean air through the dedusting fan. outside the dust collection device.

According to some embodiments of the present disclosure, the mass flow ratio of the air in the return air duct to the dust transported in the dust collection air duct is 3-6.

According to some embodiments of the present disclosure, collecting the separated dust to be treated includes collecting the separated dust to be treated using a dust processing device.

According to some embodiments of the present disclosure, the dust processing equipment includes a bar pressing machine, and the dust centralized collection method further includes processing the dust collected by the dust processing device by pressing a bar pressing the bar pressing machine.

According to some embodiments of the present disclosure, before the dust discharged from the dust collector is collectively transported to the gas-material separator through the dust collection air duct, the centralized dust collection method includes: adjusting the wind speed in the return air duct to a desired value Dust conveying wind speed.

According to some embodiments of the present disclosure, the required dust conveying wind speed is 15-40 m/s.

According to some embodiments of the present disclosure, when two or more dust collectors including the first dust collector are activated,

The first dust collector is started before the rest of the two or more dust collectors; or

The first dust collector and the remaining dust collectors of the two or more dust collectors are activated simultaneously.

According to some embodiments of the present disclosure, the method for centralized dust collection includes: when the dust stops entering the dust collector from outside the dust centralized collection device, the first dust collector and the gas-material separator are delayed for a period of time. stop.

According to some embodiments of the present disclosure, when two or more dust collectors including a first dust collector are activated, when dust stops entering the dust collectors from outside the dust centralized collection device, the first dust collector is later than the first dust collector. The rest of the above two or more dust collectors are stopped.

According to some embodiments of the present disclosure, the delay time of the first dust collector and the gas material separator is 5-15 minutes.

The dust centralized collection device provided by the present disclosure adopts a wind-driven centralized collection method including multiple dedusting of gas and material separation, and can perform preliminary gas and material separation through an air-material separator, and the separated dust is directly collected, and the air that has undergone coarse dust removal is It is transported to the first dust collector for further dust removal, and after reaching the emission standard, the dust is discharged out of the centralized collection device, which is conducive to improving the problem of dust accumulation in the conveying equipment and breeding of tobacco bugs.

At the same time, in the process of centralized dust collection, the conveying of the screw conveyor is replaced by the wind conveying, which solves the problems of the high failure rate of the conveying mode of the screw conveyor and the heavy workload of installation and maintenance.

In addition, since the dust collector is also a part of the dust removal system, the dust centralized collection device and the dust removal system where the first dust collector is located share the first dust collector and the dust removal fan, which is beneficial to improve the flexibility of the layout of each equipment in the dust centralized collection device It is also conducive to reducing equipment investment, reducing equipment occupation, and reducing energy consumption.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings.

Description of drawings

The accompanying drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the attached image:

FIG. 1 is a schematic structural diagram of a dust centralized collecting device using a screw conveyor as a dust conveying device in the prior art.

FIG. 2 is a schematic structural diagram of a device for collecting dust in some embodiments of the present disclosure.

FIG. 3 is an A-A view of the dust collection device shown in FIG. 2 .

In Figure 1, each reference sign represents:

1'—dust collector; 11'—ash hopper; 12'—ash discharge valve; 13'—dust discharge pipe; 2'—climbing screw conveyor; 3'—bar pressing machine; 31'—dust collection box; 4'—horizontal screw conveyor; 41'—screw shaft; 42'—spiral blade; 43'—conveying pipe wall; 45'—conveying motor.

In Figure 2 and Figure 3, each reference number represents:

1A—the first dust collector; 1B—the second dust collector; 10—the dust collector body; 11—the dust collecting hopper; 12—the dust discharge pipe; 13—the dust discharge valve; 2—the return air pipe; 21—the air volume control valve; 22—wind speed detection device; 23—input port; 24—output port; 3—gas material separator; 30—gas material separator body; 31—air lock; 32—blanking pipe; 33—air outlet; 34— Air inlet; 35—discharge port; 4—bar pressing machine; 40—bar pressing machine body; 41—dust collection box; 5—dust collector air inlet pipe; 6—dust removal fan; 7—dust collection air duct; 71— Filter screen; 72—supply air outlet; 73—dust collection port; 74—dust exhaust port.

Detailed ways

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application or uses in any way. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise. Meanwhile, it should be understood that, for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized description. In all examples shown and discussed herein, any specific value should be construed as illustrative only and not as limiting. Accordingly, other examples of exemplary embodiments may have different values. It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of the present disclosure, it should be understood that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special Therefore, it cannot be construed as a limitation on the protection scope of the present disclosure.

In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the orientation words such as "upper, lower", etc. is usually based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure and simplification Description, in the case of no indication to the contrary, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present disclosure; The directional words "inside and outside" refer to inside and outside relative to the contours of the components themselves.

FIG. 1 is a schematic structural diagram of a dust centralized collecting device using a screw conveyor as a dust conveying device in the prior art. As shown in Figure 1, the dust collected by the dust collector 1' passes through the ash collecting hopper 11', the ash discharge valve 12', and the dust discharge pipe 13' in sequence, and then is sent to the horizontal screw conveyor 4', and then passes through the climbing screw conveyor. 2' is sent to the dust box 31' of the bar press 3' for bar pressing.

In the process of realizing the technical solution of the present disclosure, the inventor found that the dust centralized collection device as shown in FIG. 1 has the following problems:

1. There needs to be a large gap between the spiral blade 42' of the screw conveyor and the pipe wall 43' of the conveying pipe, and a large amount of dust is deposited on the pipe wall, which is very easy to breed tobacco insects.

2. Affected by the 3' height of the bar press and the 2' climbing angle of the climbing screw conveyor, the layout of the device is poor in flexibility and occupies a large space.

3. In the case of a large number of dust collectors 1' in the device, the length of the horizontal screw conveyor 4' is long, the screw shaft 41' and the connection between the screw shaft 41' and the screw blade 42' are easily broken, and the equipment failure rate higher.

4. The manufacturing cost of the screw conveyor is high, and the installation and maintenance are difficult.

In order to solve the problems existing in the above devices, the present disclosure provides a different centralized dust collection device. As shown in FIG. 2 and FIG. 3 , in some embodiments of the centralized dust collection device provided by the present disclosure, the centralized dust collection device includes a dust collector, an air-material separator 3 , a dust collection air duct 7 , a return air duct 2 and a dust collector Fan 6.

The number of dust collectors can be one or more. The dust collector includes a dust collector body 10 , a dust discharge pipe 12 and a dust collector air inlet pipe 5 , and the dust discharge pipe 12 and the dust collector air inlet pipe 5 are respectively connected to the dust collector body 10 . No matter the number of dust collectors is one or more, the dust collector should include the first dust collector 1A, and the first dust collector 1A also includes an exhaust pipe.

The gas-material separator 3 includes a gas-material separator body 30 , an air inlet 34 , an air outlet 33 and a discharge port 35 , and the air inlet 34 , the air outlet 33 and the discharge port 35 are connected to the gas-material separator body 30 .

The dust collection air duct 7 includes a dust collection port 73 and a dust discharge port 74. The dust collection port 73 of the dust collection air duct 7 is connected to the dust discharge pipe 12 of the dust collector, and the dust discharge port 74 of the dust collection air duct 7 is separated from the gas material. The air inlet 34 of the device 3 is connected.

The return air pipe 2 includes an input port 23 and an output port 24. The input port 23 of the return air pipe 2 is connected to the air outlet 33 of the gas-material separator 3, and the output port 24 of the return air pipe 2 is connected to the dust collector of the first dust collector 1A. The air inlet pipe 5 is connected. In this way, an annular pipeline is formed between the first dust collector 1A, the gas-material separator 3, the dust collecting air duct 7 and the return air duct 2.

The air inlet end of the dust removal fan 6 is connected to the exhaust pipe of the first dust collector 1A.

Because they are in the same annular pipeline, the first dust collector 1A and the gas-material separator 3 share a dust removal fan 6 . The air volume required for the work of the dust collector is usually more than 8000m ³ /h, and there is a margin of 20-30% when selecting the type, while the air volume required for the work of the gas-material separator is usually 500-1800m ³ /h. Fans are suitable. The dust collector is also a part of the dust removal system, so the centralized dust collection device and the dust removal system where the first dust collector 1A is located share the first dust collector 1A and the dust removal fan 6, which is beneficial to improve the flexibility of the layout of each equipment in the centralized dust collection device It is also conducive to reducing equipment investment, reducing equipment occupation, and reducing energy consumption.

In some embodiments, the precipitator further includes a second precipitator 1B, and the precipitator air inlet duct 5 of the second precipitator 1B is isolated from the output port 24 of the return air duct 2 .

In some embodiments, the dust remover includes a dust discharge valve 13 disposed at the bottom of the dust remover body 10 , and the dust discharge pipe 12 is connected to the dust discharge valve 13 and extends downward from the dust discharge valve 13 to the dust collection air pipe 7 . In the dust port 73, the dust falls from the dust collecting hopper 11 to the dust collecting air duct 7 by its own gravity.

In some embodiments, the gas-feed separator 3 may be a cyclone or a settling box.

In some embodiments, the dust centralized collection device includes a dust processing device connected to the discharge port 35 of the gas-material separator 3 .

The dust processing equipment may be a rod press 4 , which includes a dust collecting box 41 and a rod pressing machine body 40 , and the feeding port of the dust collecting box 41 is connected to the discharging port 35 of the gas-material separator 3 .

In the above-mentioned embodiment, the gas-material separator 3 further includes a blanking pipe 32 and an air lock 31 arranged between the gas-material separator body 30 and the blanking pipe 32 , and the discharge port 35 is the outlet of the blanking pipe 32 . , the gas material separator body 30, the gas lock 31, the blanking pipe 32 and the dust collecting box 41 are arranged in order from top to bottom. The air lock 31 can enable the air-material separator 3 to better separate the dust in the dust-containing air, and the separated dust can directly fall into the dust collecting box 41 by its own gravity.

In some embodiments, the dust collecting air duct 7 includes a supplementary air port 72 and a filter screen 71, all the dust collecting ports 73 of the dust collecting air duct 7 are provided between the supplementary air port 72 and the dust discharge port 74, and the filter screen 71 is provided in the supplementary air port 72 and the dust discharge port 74. The tuyere 72 is used to filter the air for conveying dust. In this way, the air that transports dust can enter the dust collection device from the air supply port 72 to prevent the sundries in the external environment from being sucked into the device and affect the normal operation of the equipment. Accidents such as dust explosions.

In addition, the diameter of the dust collecting air duct 7 should match the dust mass flow rate that the device needs to collect. When the mass flow of dust to be collected by the device is large, the diameter of the dust collection air duct 7 can be designed to be larger; when the mass flow of dust to be collected by the device is small, the diameter of the dust collection air duct 7 can be designed to be smaller .

In some embodiments, the centralized dust collection device further includes a wind speed detection device 22 disposed on the straight pipe section of the return air duct 2 . The wind speed detection device 22 may be an online anemometer or a wind speed detection port. Among them, the online anemometer is used to automatically measure the wind speed in the return air duct 2 , and the wind speed detection port is used to manually measure the wind speed in the return air duct 2 .

In some embodiments, the centralized dust collection device further includes an air volume regulating valve 21 disposed on the return air duct 2 , and the air volume regulating valve 21 is used to adjust the air volume in the return air duct 2 . The air volume refers to the flow of air in the return air duct 2 per unit time.

Based on the dust centralized collection device provided by the present disclosure, the present disclosure also provides a dust centralized collection method, which includes the following steps: starting at least one dust collector including the first dust collector 1A; Centrally transport the dust discharged from at least one dust collector activated to the gas-material separator 3; separate the dust-containing air through the gas-material separator 3 to obtain the dust to be treated and the air that has been subjected to rough dust removal; and collect and separate the to-be-treated air For dust, the coarsely dedusted air obtained by separation is conveyed through the return air pipe 2 to the first dust collector 1A for further dedusting, and the further dedusted clean air is discharged through the dedusting fan to the outside of the centralized dust collection device.

Since the first dust collector 1A, the gas-material separator 3, the dust-collecting air duct 7 and the return air duct 2 form an annular pipeline, the above-mentioned centralized dust collection device and the corresponding centralized dust collection method can realize the separation of gas and material. Repeated dust removal improves the problem of dust accumulation and breeding of tobacco bugs in conveying equipment.

At the same time, in the process of centralized dust collection, the conveying of the screw conveyor is replaced by the wind conveying, which solves the problems of the high failure rate of the conveying mode of the screw conveyor and the heavy workload of installation and maintenance.

In some embodiments, the mass flow ratio of the air in the return air duct 2 to the dust transported in the dust collection air duct 7 is 3-6. When the density of the dust conveyed in the dust collecting air duct 7 is high, a larger value can be taken, and a small value can be taken when the dust density is small.

Based on the above embodiments, the diameter of the dust collecting air duct 7 can be designed according to the mass flow rate of the dust and the properties of the dust. For example, a tobacco company uses the above device to process tobacco dust, the maximum mass flow of dust entering the device is 280kg/h, the moisture content of tobacco dust is about 14%, and the density is about 350kg/m ³ . Because the moisture content of dust is about 14%, it belongs to dry dust. According to the above given conditions, a certain margin is reserved in the design, the gas-to-material mass flow ratio can be taken as 4, the wind speed in the dust collection air duct 7 can be taken as 25m/s, and the air density at room temperature is calculated as 1.18kg/ ^m3 . The air mass flow in the dust collecting air duct 7 is Q, then the diameter D of the dust collecting air duct 7 is calculated as follows:

Q=280/1.18×4=949(m ³ /h) (1)

Q=3600×(πD ² /4)×25=70650D ² (m ³ /h) (2)

Formula 1 and Formula 2 are combined, and the pipe diameter D=116mm can be obtained, and D=120mm.

In some embodiments, collecting the separated dust to be treated includes collecting the separated dust to be treated using a dust processing device.

In the above-mentioned embodiment, the dust processing equipment includes a rod pressing machine 4, and the centralized dust collection method further includes using the rod pressing machine 4 to press rods to process the dust collected by the dust processing equipment.

In some embodiments, before collectively conveying the dust discharged from the dust collector to the gas-material separator 3 through the dust collecting air duct 7, the centralized dust collection method includes: adjusting the wind speed in the return air duct 2 to the required dust conveying wind speed.

The required dust conveying wind speed is 15-40m/s. For example, in the aforementioned embodiment where the maximum dust mass flow rate entering the device is 280kg/h and the moisture content of the tobacco dust is about 14%, the required dust conveying wind speed can be 25m/s.

In order to achieve better dust conveying effect and improve the situation of dust accumulation or material blockage in the dust collection air duct and return air duct, when the density of dust to be collected by the device is relatively high, the wind speed in the return air duct 2 can be increased. ; When the density of dust to be collected by the device is small, the wind speed in the return air duct 2 can be adjusted to be smaller.

In some embodiments, when two or more precipitators including the first precipitator 1A are activated, the first precipitator 1A is activated before the rest of the two or more precipitators; The remaining dust collectors among the above-mentioned dust collectors are activated at the same time.

When the dust enters any dust collector from outside the dust collection device, the first dust collector 1A, the gas-material separator 3 and the dust removal fan 6 are started.

In some embodiments, the centralized dust collection method includes: when the dust stops entering the dust collector from outside the dust centralized collection device, the first dust collector 1A and the gas-material separator 3 stop after a delay for a period of time.

In some embodiments, when two or more dust collectors including the first dust collector 1A are activated, when the dust stops entering the dust collector from outside the dust collection device, the first dust collector 1A is later than the rest of the two or more dust collectors. Dust collector stopped.

In the above embodiment, the delay time of the first dust collector 1A and the gas-material separator 3 is 5-15 minutes. For example, in the aforementioned embodiment where the maximum dust mass flow rate entering the device is 280 kg/h and the moisture content of the tobacco dust is about 14%, the delay time may be 10 minutes.

In the entire centralized dust collection device, the first dust collector 1A starts first, stops operation at the latest, and has the longest running time, which ensures that the centralized dust collection device can achieve multiple times of gas and material separation and dust removal during the entire operation process, improving the collection effect.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and not to limit them; although the present disclosure has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand: Modifications to the disclosed specific embodiments or equivalent replacement of some technical features shall all be included in the scope of the technical solutions claimed in the present disclosure.

Claims (20)

1. A dust collecting device, comprising:

the dust remover comprises a dust remover body (10), a dust exhaust pipe (12) and a dust remover air inlet pipe (5), wherein the dust exhaust pipe (12) and the dust remover air inlet pipe (5) are respectively connected with the dust remover body (10), the at least one dust remover comprises a first dust remover (1A), and the first dust remover (1A) further comprises an exhaust pipe;

the gas-material separator (3) comprises a gas-material separator body (30), an air inlet (34), an air outlet (33) and a discharge opening (35), wherein the air inlet (34), the air outlet (33) and the discharge opening (35) are connected with the gas-material separator body (30);

the dust collecting air pipe (7), the dust collecting air pipe (7) comprises a dust collecting opening (73) and a dust discharging opening (74), the dust collecting opening (73) of the dust collecting air pipe (7) is connected with the dust discharging pipe (12) of the dust remover, and the dust discharging opening (74) of the dust collecting air pipe (7) is connected with the air inlet (34) of the gas-material separator (3);

the air return pipe (2), the air return pipe (2) comprises an input port (23) and an output port (24), the input port (23) of the air return pipe (2) is connected with the air outlet (33) of the gas-material separator (3), and the output port (24) of the air return pipe (2) is connected with the dust remover air inlet pipe (5) of the first dust remover (1A); and

the dust removal fan (6), the air inlet end of dust removal fan (6) with the exhaust pipe of first dust remover (1A) is connected.

2. The dust collecting device of claim 1, wherein said at least one dust separator further comprises a second dust separator (1B), and wherein the dust separator inlet duct (5) of said second dust separator (1B) is isolated from the outlet opening (24) of said return duct (2).

3. The dust collecting device as recited in claim 1, further comprising an ash valve (13) disposed at the bottom of said body (10), said ash pipe (12) being connected to said ash valve (13) and extending downward from said ash valve (13) to a dust collecting opening (73) of said dust collecting duct (7).

4. Dust concentration collection device according to claim 1, characterized in that the gas-material separator (3) comprises a cyclone or a settling tank.

5. Dust concentration collection device according to claim 1, characterized by comprising a dust handling equipment connected to the discharge opening (35) of the gas-material separator (3).

6. The dust collecting device of claim 5, wherein the dust processing equipment comprises a bar press (4), the bar press (4) comprises a dust box (41) and a bar press body (40), and the inlet of the dust box (41) is connected with the outlet (35) of the gas-material separator (3).

7. The dust concentration collection device according to claim 6, wherein the gas-material separator (3) further comprises a blanking pipe (32) and an air lock (31) arranged between the gas-material separator body (30) and the blanking pipe (32), the discharge port (35) is an outlet of the blanking pipe (32), and the gas-material separator body (30), the air lock (31), the blanking pipe (32) and the dust box (41) are arranged in sequence from top to bottom.

8. The dust concentration and collection device according to claim 1, wherein the dust collection air pipe (7) further comprises an air supply opening (72) and a filter screen (71), all the dust collection openings (73) of the dust collection air pipe (7) are arranged between the air supply opening (72) and the dust exhaust opening (74), and the filter screen (71) is arranged at the air supply opening (72) and used for filtering air for conveying dust.

9. The dust concentration collection device according to claim 1, further comprising an air speed detection device (22) arranged on the straight pipe section of the return air pipe (2), wherein the air speed detection device (22) comprises at least one of an online anemometer and an air speed detection port; the online anemometer is used for automatically measuring the wind speed in the air return pipe (2), and the wind speed detection port is used for manually measuring the wind speed in the air return pipe (2).

10. The dust concentration collection device according to claim 1, further comprising an air volume adjusting valve (21) disposed on the return air duct (2), wherein the air volume adjusting valve (21) is used for adjusting the air volume in the return air duct (2).

11. A dust collection method using the dust collection device according to any one of claims 1 to 10, comprising:

starting at least one dust remover comprising a first dust remover (1A);

dust discharged by at least one started dust remover is conveyed to the gas-material separator (3) in a centralized manner through the dust collection air pipe (7);

separating the air containing dust by the gas-material separator (3) to obtain the dust to be treated and the air subjected to coarse dust removal; and

and collecting the dust to be treated obtained by separation, conveying the air subjected to coarse dust removal and obtained by separation to the first dust remover (1A) through the air return pipe (2) for further dust removal, and discharging the clean air subjected to further dust removal to the outside of the dust centralized collection device through the dust removal fan.

12. The dust centralized collection method according to claim 11, wherein the mass flow ratio of the air in the return air duct (2) to the dust conveyed in the dust collection air duct (7) is 3-6.

13. The method of claim 11 or 12, wherein collecting the separated dust to be treated comprises collecting the separated dust to be treated using a dust treatment device.

14. The dust centralized collection method according to claim 13, wherein the dust processing equipment comprises a rod press (4), and the dust centralized collection method further comprises processing the dust collected by the dust processing equipment by using the rod press (4).

15. The method of claim 11 or 12, wherein before the dust discharged from the dust collector is intensively conveyed to the gas-material separator (3) through the dust collecting duct (7), the method of intensively collecting dust comprises: and adjusting the air speed in the return air pipe (2) to the required dust conveying air speed.

16. The method for collecting dust according to claim 15, wherein the required dust conveying wind speed is 15-40 m/s.

17. The dust collecting method according to claim 11 or 12, wherein when two or more dust collectors including the first dust collector (1A) are activated,

the first dust remover (1A) is started before the rest of the two or more dust removers; or

The first dust remover (1A) and the rest of the dust removers are started simultaneously.

18. The dust collecting method according to claim 11 or 12, comprising: when dust stops entering the dust remover from the outside of the dust centralized collection device, the first dust remover (1A) and the gas-material separator (3) stop after a period of time delay.

19. The method of claim 18, wherein when two or more dusters including a first duster (1A) are started, the first duster (1A) is stopped later than the rest of the two or more dusters when dust stops entering the dusters from outside the centralized dust collecting apparatus.

20. The dust concentration collection method according to claim 19, wherein the time for delaying the first dust collector (1A) and the gas-material separator (3) is 5 to 15 minutes.

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