Dust collecting apparatus and dust collecting method

Abstract

The present disclosure provides a dust centralized collection device and a dust centralized collection method. The dust centralized collection device comprises at least one dust collector, 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 connected with the dust collector body respectively, the at least one dust collector comprises a first dust collector; a gas-material separator comprising a gas-material separator body, an air inlet, an air outlet and a material discharge port; a dust collection air pipe comprising a dust collection port and a dust discharge port, the dust collection port is connected with the dust discharge pipe of the dust collector, and the dust discharge port is connected with the air inlet of the gas-material separator; an air return pipe comprising 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 air inlet pipe of the first dust collector; and a dust removal fan, an air inlet end of which is connected with the dust discharge pipe of the first dust collector. The present disclosure improves the problems of dust accumulation, breeding of insects and the like of the dust centralized collection device by adopting the wind force centralized collection mode comprising gas-material separation and multiple dust removal.

Description

Technical Field

[0001] This disclosure relates to the field of tobacco machinery technology, and in particular to a dust collection device and a dust collection method. Background Technology

[0002] During the cigarette production and processing, many processes generate a large amount of tobacco dust due to material breakage. This dust is collected by dust removal systems and then sent to dust treatment equipment. To avoid secondary pollution during packaging and transportation, the dust collected by multiple dust removal systems is usually collected and treated centrally.

[0003] Currently, centralized tobacco dust collection devices often use screw conveyors as dust conveying equipment. However, these devices still have the following problems: after use, a large amount of dust accumulates on the pipe walls, which easily breeds tobacco insects; the layout of the entire device is inflexible and occupies a large space; when there are many dust collectors in the device, the length of the screw conveyor is long, resulting in a high equipment failure rate; the manufacturing cost of screw conveyors is high, and installation and maintenance are difficult. Summary of the Invention

[0004] The purpose of this disclosure is to provide a dust collection device and a dust collection method to improve the problems of dust accumulation on conveying equipment during the dust collection process.

[0005] The first aspect of this disclosure provides a dust collection device, comprising:

[0006] At least one dust collector, the dust collector includes a dust collector body, a dust discharge pipe and a dust collector inlet pipe, the dust discharge pipe and the dust collector inlet pipe are respectively connected to the dust collector body, the at least one dust collector includes a first dust collector, the first dust collector also includes a dust discharge pipe;

[0007] A gas-material separator, comprising a gas-material separator body, an air inlet, an air outlet, and a discharge outlet, wherein the air inlet, air outlet, and discharge outlet are connected to the gas-material separator body;

[0008] The dust collection duct includes a dust collection port and a dust discharge port. The dust collection port of the dust collection duct is connected to the dust discharge port of the dust collector, and the dust discharge port of the dust collection duct is connected to the air inlet of the gas separator.

[0009] A return air duct, comprising an inlet and an outlet, wherein the inlet of the return air duct is connected to the outlet of the gas-material separator, and the outlet of the return air duct is connected to the inlet of the dust collector of the first dust collector; and

[0010] A dust removal fan, the air inlet of which is connected to the exhaust pipe of the first dust collector.

[0011] According to some embodiments of this disclosure, the at least one dust collector further includes a second dust collector, wherein the dust collector inlet duct of the second dust collector is isolated from the outlet of the return duct.

[0012] According to some embodiments of this disclosure, the dust collector includes a dust discharge valve disposed at the bottom of the dust collector body, 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 duct.

[0013] According to some embodiments of this disclosure, the gas separator includes a cyclone dust collector or a settling tank.

[0014] According to some embodiments of this disclosure, the dust collection device includes a dust treatment device connected to the discharge port of the gas separator.

[0015] According to some embodiments of this disclosure, the dust treatment equipment includes a briquette press, which includes a dust collection box and a briquette press body. The inlet of the dust collection box is connected to the outlet of the gas-material separator.

[0016] According to some embodiments of this disclosure, the gas-material separator further includes a discharge pipe and an airlock disposed between the gas-material separator body and the discharge pipe, the discharge port is the outlet of the discharge pipe, and the gas-material separator body, the airlock, the discharge pipe and the dust collection box are arranged sequentially from top to bottom.

[0017] According to some embodiments of this disclosure, the dust collection duct includes an air inlet and a filter screen. All the dust collection inlets of the dust collection duct are disposed between the air inlet and the dust outlet. The filter screen is disposed at the air inlet and is used to filter the air carrying dust.

[0018] According to some embodiments of this disclosure, the dust collection device further includes a wind speed detection device disposed on a straight section of the return air duct, the wind speed detection device including 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.

[0019] According to some embodiments of this disclosure, the dust collection device further includes an air volume regulating valve disposed on the return air duct, the air volume regulating valve being used to regulate the air volume in the return air duct.

[0020] A second aspect of this disclosure provides a method for centralized dust collection, comprising:

[0021] Start at least one dust collector, including the first dust collector;

[0022] The dust discharged from at least one dust collector that has been activated is centrally transported to the gas-material separator through the dust collection duct.

[0023] The air containing dust is separated by the air-material separator to obtain the dust to be treated and the air after coarse dust removal; and

[0024] The separated dust is collected and transported through the return air duct to the first dust collector for further dust removal. The clean air after further dust removal is discharged to the outside of the dust collection device through the dust removal fan.

[0025] According to some embodiments of this disclosure, the mass flow ratio of air in the return air duct to dust transported in the dust collection duct is 3 to 6.

[0026] According to some embodiments of this disclosure, collecting the separated dust to be treated includes collecting the separated dust to be treated using a dust treatment device.

[0027] According to some embodiments of this disclosure, the dust treatment equipment includes a bar press, and the dust collection method further includes using the bar press to press bars to treat the dust collected by the dust treatment equipment.

[0028] According to some embodiments of this disclosure, before the dust discharged from the dust collector is centrally transported to the air-material separator through the dust collection duct, the dust collection method includes: adjusting the wind speed in the return air duct to the required dust transport wind speed.

[0029] According to some embodiments of this disclosure, the required dust conveying velocity is 15 to 40 m / s.

[0030] According to some embodiments of this disclosure, when two or more dust collectors, including a first dust collector, are started...

[0031] The first dust collector starts before the other dust collectors among the two or more dust collectors; or

[0032] The first dust collector starts simultaneously with the remaining dust collectors among the two or more dust collectors.

[0033] According to some embodiments of this disclosure, the dust collection method includes: when dust stops entering the dust collector from outside the dust collection device, the first dust collector and the gas separator stop after a certain period of time.

[0034] According to some embodiments of this disclosure, when two or more dust collectors, including a first dust collector, are started, the first dust collector stops entering the dust collector from outside the dust collection device when dust stops.

[0035] According to some embodiments of this disclosure, the delay time between the first dust collector and the gas separator is 5 to 15 minutes.

[0036] The dust collection device disclosed herein adopts a wind-powered centralized collection method that includes multiple dust removal processes involving gas-material separation. The gas-material separator can perform preliminary gas-material separation, and the separated dust is collected directly. The air that has undergone coarse dust removal is then transported to the first dust collector for further dust removal. After meeting the emission standards, the air is discharged from the dust collection device, which helps to improve the problems of dust accumulation and insect breeding in conveying equipment.

[0037] Meanwhile, the dust collection process has been replaced by wind-powered conveying instead of screw conveyor, which solves the problems of high failure rate and large workload of installation and maintenance of screw conveyor.

[0038] In addition, since the dust collector is also part of the dust removal system, the dust collection device shares the first dust collector and the dust removal fan with the dust removal system where the first dust collector is located. This arrangement is conducive to improving the flexibility of the layout of various equipment in the dust collection device, and also helps to reduce equipment investment, reduce equipment footprint, and reduce energy consumption.

[0039] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0040] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this application, illustrate exemplary embodiments of the present disclosure and are used to explain the disclosure, but do not constitute an undue limitation thereof. In the drawings:

[0041] Figure 1 This is a schematic diagram of a dust collection device that uses a screw conveyor as a dust conveying equipment in the prior art.

[0042] Figure 2 This is a schematic diagram of the structure of a dust collection device in some embodiments of this disclosure.

[0043] Figure 3 for Figure 2 A view of the dust collection device shown in AA.

[0044] Figure 1 In the figures, the labels represent:

[0045] 1'—Dust collector; 11'—Dust hopper; 12'—Dust discharge valve; 13'—Dust discharge pipe; 2'—Inclining screw conveyor; 3'—Pressure bar press; 31'—Dust collection box; 4'—Horizontal screw conveyor; 41'—Screw shaft; 42'—Screw blades; 43'—Conveying pipe wall; 45'—Conveying motor.

[0046] Figure 2 and Figure 3 In the figures, the labels represent:

[0047] 1A—First dust collector; 1B—Second dust collector; 10—Dust collector body; 11—Dust collection hopper; 12—Dust discharge pipe; 13—Dust discharge valve; 2—Return air pipe; 21—Air volume regulating valve; 22—Wind speed detection device; 23—Inlet; 24—Outlet; 3—Air-material separator; 30—Air-material separator body; 31—Air lock; 32—Discharge pipe; 33—Air outlet; 34—Air inlet; 35—Discharge port; 4—Pressure bar press; 40—Pressure bar press body; 41—Dust collection box; 5—Dust collector inlet pipe; 6—Dust collector fan; 7—Dust collection duct; 71—Filter screen; 72—Make-up air port; 73—Dust collection port; 74—Dust discharge port. Detailed Implementation

[0048] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0049] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0050] In the description of this disclosure, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

[0051] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "upper" and "lower" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms 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 a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0052] Figure 1 This is a schematic diagram of a dust collection device that uses a screw conveyor as a dust conveying equipment in existing technology. Figure 1 As shown, the dust collected by the dust collector 1' is sequentially sent to the horizontal screw conveyor 4' through the dust collection hopper 11', the dust discharge valve 12', and the dust discharge pipe 13', and then sent to the dust collection box 31' of the pressing machine 3' for pressing.

[0053] In the process of implementing the technical solution of this disclosure, the inventors discovered that... Figure 1 The dust collection device shown has the following problems:

[0054] 1. A large gap needs to be left between the spiral blades 42' of the screw conveyor and the wall 43' of the conveying pipe. A large amount of dust accumulates on the pipe wall, which easily breeds tobacco insects.

[0055] 2. Due to the influence of the 3' height of the bar press and the 2' climbing angle of the inclined screw conveyor, the layout of the device is not flexible and occupies a large space.

[0056] 3. When there are a large number of dust collectors 1' in the device, the horizontal screw conveyor 4' is long, and the screw shaft 41' and the connection between the screw shaft 41' and the screw blade 42' are prone to breakage, resulting in a high equipment failure rate.

[0057] 4. Screw conveyors have high manufacturing costs and are difficult to install and maintain.

[0058] To address the problems of the aforementioned devices, this disclosure provides a different dust collection and concentration device. For example... Figure 2 and Figure 3 As shown, in some embodiments of the dust collection device provided in this disclosure, the dust collection device includes a dust collector, an air-material separator 3, a dust collection duct 7, a return air duct 2, and a dust collection fan 6.

[0059] The number of dust collectors can be one or more. Each dust collector includes a dust collector body 10, a dust discharge pipe 12, and a dust collector inlet pipe 5, which are respectively connected to the dust collector body 10. Regardless of whether the number of dust collectors is one or more, each dust collector should include a first dust collector 1A, which also includes an exhaust pipe.

[0060] The gas separator 3 includes a gas separator body 30, an air inlet 34, an air outlet 33, and a discharge port 35. The air inlet 34, the air outlet 33, and the discharge port 35 are connected to the gas separator body 30.

[0061] The dust collection duct 7 includes a dust collection port 73 and a dust discharge port 74. The dust collection port 73 of the dust collection duct 7 is connected to the dust discharge pipe 12 of the dust collector, and the dust discharge port 74 of the dust collection duct 7 is connected to the air inlet 34 of the air-material separator 3.

[0062] The return air duct 2 includes an inlet 23 and an outlet 24. The inlet 23 of the return air duct 2 is connected to the outlet 33 of the air-material separator 3, and the outlet 24 of the return air duct 2 is connected to the dust collector inlet duct 5 of the first dust collector 1A. In this way, the first dust collector 1A, the air-material separator 3, the dust collection duct 7, and the return air duct 2 form a ring pipeline.

[0063] The air inlet of the dust collector fan 6 is connected to the exhaust pipe of the first dust collector 1A.

[0064] Because they are located within the same annular pipeline, the first dust collector 1A and the air-material separator 3 share a single dust collector fan 6. The air volume required for the dust collector to operate is typically around 8000 m³ / h. 3 The required airflow rate is above 100 m³ / h, with a 20-30% margin during selection, while the airflow required for gas-liquid separator operation is typically 500-1800 m³ / h. 3 / h, sharing a dust removal fan is appropriate. The dust collector is also part of the dust removal system, so the dust collection device shares the first dust collector 1A and the dust removal fan 6 with the dust removal system where the first dust collector 1A is located. This arrangement is conducive to improving the flexibility of the layout of various equipment in the dust collection device, and also conducive to reducing equipment investment, reducing equipment footprint, and reducing energy consumption.

[0065] In some embodiments, the dust collector further includes a second dust collector 1B, wherein the dust collector inlet 5 of the second dust collector 1B is isolated from the outlet 24 of the return air duct 2.

[0066] In some embodiments, the dust collector includes a dust discharge valve 13 disposed at the bottom of the dust collector body 10, a dust discharge pipe 12 connected to the dust discharge valve 13, and extending downward from the dust discharge valve 13 to the dust collection port 73 of the dust collection duct 7. The dust falls from the dust collection hopper 11 into the dust collection duct 7 by its own gravity.

[0067] In some embodiments, the gas separator 3 may be a cyclone dust collector or a settling tank.

[0068] In some embodiments, the dust collection device includes a dust treatment device connected to the discharge port 35 of the gas separator 3.

[0069] The dust treatment equipment can be a briquette press 4, which includes a dust collection box 41 and a briquette press body 40. The inlet of the dust collection box 41 is connected to the outlet 35 of the gas-material separator 3.

[0070] In the above embodiment, the air-material separator 3 further includes a discharge pipe 32 and an airlock 31 disposed between the air-material separator body 30 and the discharge pipe 32. The discharge port 35 is the outlet of the discharge pipe 32. The air-material separator body 30, the airlock 31, the discharge pipe 32, and the dust collection box 41 are arranged sequentially from top to bottom. The airlock 31 enables the air-material separator 3 to better separate dust from the dust-containing air, and the separated dust can fall directly into the dust collection box 41 by its own gravity.

[0071] In some embodiments, the dust collection duct 7 includes an air inlet 72 and a filter screen 71. All dust collection ports 73 of the dust collection duct 7 are located between the air inlet 72 and the dust outlet 74. The filter screen 71 is located at the air inlet 72 and is used to filter the air transporting dust. In this way, the air transporting dust can enter the dust collection device from the air inlet 72, preventing debris from the external environment from being sucked into the device and affecting the normal operation of the equipment. At the same time, it prevents hard objects from entering the dust collection device and colliding with the duct to generate sparks, thus avoiding accidents such as dust explosions.

[0072] In addition, the diameter of the dust collection duct 7 should match the mass flow rate of dust to be collected by the device. When the mass flow rate of dust to be collected by the device is large, the diameter of the dust collection duct 7 can be designed to be larger; when the mass flow rate of dust to be collected by the device is small, the diameter of the dust collection duct 7 can be designed to be smaller.

[0073] In some embodiments, the dust collection device further includes a wind speed detection device 22 disposed on a straight section of the return air duct 2. The wind speed detection device 22 can be an online anemometer or a wind speed detection port. The online anemometer is used to automatically measure the wind speed in the return air duct 2, while the wind speed detection port is used to manually measure the wind speed in the return air duct 2.

[0074] In some embodiments, the dust collection device further includes an airflow regulating valve 21 disposed on the return air duct 2, which is used to regulate the airflow in the return air duct 2. Airflow refers to the amount of air flowing through the return air duct 2 per unit time.

[0075] Based on the dust collection device provided in this disclosure, this disclosure also provides a dust collection method, which includes the following steps: starting at least one dust collector, including a first dust collector 1A; centrally conveying the dust discharged from the started dust collector to an air-material separator 3 through a dust collection duct 7; separating the dust-containing air through the air-material separator 3 to obtain dust to be treated and air that has undergone coarse dust removal; collecting the separated dust to be treated, conveying the separated air that has undergone coarse dust removal to the first dust collector 1A for further dust removal through a return air duct 2, and discharging the further dust-removed clean air to the outside of the dust collection device through a dust removal fan.

[0076] Since the first dust collector 1A, the gas-material separator 3, the dust collection duct 7 and the return air duct 2 form a ring pipeline, the above-mentioned dust collection device and the corresponding dust collection method can achieve multiple dust removal including gas-material separation, which improves the problems of dust accumulation and insect breeding in conveying equipment.

[0077] Meanwhile, the dust collection process has been replaced by wind-powered conveying instead of screw conveyor, which solves the problems of high failure rate and large workload of installation and maintenance of screw conveyor.

[0078] In some embodiments, the mass flow ratio of air in the return air duct 2 to dust transported in the dust collection duct 7 is 3 to 6. A larger value can be used when the dust density transported in the dust collection duct 7 is high, and a smaller value can be used when the dust density is low.

[0079] Based on the above embodiments, the diameter of the dust collection duct 7 can be designed according to the dust mass flow rate and the properties of the dust. For example, a tobacco company uses the above device to treat tobacco dust. The maximum dust mass flow rate entering the device is 280 kg / h, the moisture content of the tobacco dust is approximately 14%, and the density is approximately 350 kg / m³. 3 Since the dust has a moisture content of approximately 14%, it is classified as relatively dry dust. Based on the aforementioned conditions, a certain margin is reserved in the design; the air-to-material mass flow rate ratio can be taken as 4, the air velocity in the dust collection duct 7 can be taken as 25 m / s, and the air density at room temperature is assumed to be 1.18 kg / m³. 3 Calculation: Let the air mass flow rate in dust collection duct 7 be Q. Then the diameter D of dust collection duct 7 is calculated as follows:

[0080] Q = 280 / 1.18 × 4 = 949 (m) 3 / h) (1)

[0081] Q = 3600 × (πD) 2 / 4)×25=70650D 2 (m 3 / h) (2)

[0082] By combining Equations 1 and 2, we can calculate the pipe diameter D = 116 mm, and take D = 120 mm.

[0083] In some embodiments, collecting the separated dust to be treated includes collecting the separated dust to be treated using a dust treatment device.

[0084] In the above embodiments, the dust treatment equipment includes a bar press 4, and the dust collection method further includes using the bar press 4 to press the dust collected by the dust treatment equipment.

[0085] In some embodiments, before the dust discharged from the dust collector is centrally transported to the air-material separator 3 through the dust collection duct 7, the dust collection method includes: adjusting the wind speed in the return air duct 2 to the required dust conveying wind speed.

[0086] The required dust conveying velocity is 15–40 m / s. 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 approximately 14%, the required dust conveying velocity can be 25 m / s.

[0087] To achieve better dust conveying performance and reduce dust accumulation or blockage in the dust collection duct and return air duct, the air velocity in return air duct 2 can be increased when the dust density to be collected is large, and decreased when the dust density to be collected is small.

[0088] In some embodiments, when two or more dust collectors, including the first dust collector 1A, are started, the first dust collector 1A starts before the other dust collectors among the two or more dust collectors; or the first dust collector 1A starts simultaneously with the other dust collectors among the two or more dust collectors.

[0089] When dust enters any dust collector from outside the dust collection device, the first dust collector 1A, the air-material separator 3, and the dust removal fan 6 will start.

[0090] In some embodiments, the dust collection method includes: when dust stops entering the dust collector from outside the dust collection device, the first dust collector 1A and the air-material separator 3 stop after a certain period of time.

[0091] In some embodiments, when two or more dust collectors, including the first dust collector 1A, are started, the first dust collector 1A stops after the other dust collectors among the two or more dust collectors stop entering the dust collector from outside the dust collection device.

[0092] In the above embodiments, the delay time for the first dust collector 1A and the gas-material separator 3 is 5 to 15 minutes. For example, in the 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 can be 10 minutes.

[0093] In the entire dust collection system, the first dust collector 1A starts first, stops last, and runs for the longest time, ensuring that the dust collection system can achieve multiple dust removals through gas-material separation throughout the entire operation process, thereby improving the collection effect.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and not to limit them; although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this disclosure or equivalent substitutions can be made to some technical features, all of which should be covered within the scope of the technical solutions claimed in this disclosure.

Claims

1. A dust collecting apparatus characterized by comprising: include: At least one dust collector, the dust collector includes a dust collector body (10), a dust discharge pipe (12) and a dust collector inlet pipe (5), the dust discharge pipe (12) and the dust collector inlet pipe (5) are respectively connected to the dust collector body (10), the at least one dust collector includes a first dust collector (1A), the first dust collector (1A) also includes an exhaust pipe; The gas separator (3) includes a gas 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 separator body (30); Dust collection duct (7), the dust collection duct (7) includes a dust collection port (73) and a dust discharge port (74), the dust collection port (73) of the dust collection duct (7) is connected to the dust discharge duct (12) of the dust collector, and the dust discharge port (74) of the dust collection duct (7) is connected to the air inlet (34) of the gas separator (3); A return air duct (2) includes an inlet (23) and an outlet (24). The inlet (23) of the return air duct (2) is connected to the outlet (33) of the gas separator (3), and the outlet (24) of the return air duct (2) is connected to the dust collector inlet duct (5) of the first dust collector (1A). A dust removal fan (6) is provided, the air inlet of which is connected to the exhaust pipe of the first dust collector (1A). The dust removal fan (6) is configured to discharge the clean air that has been dusted by the first dust collector (1A) to the dust collection device. The dust collection device further includes a wind speed detection device (22) installed on the straight section of the return air duct (2) and an air volume regulating valve (21) installed on the return air duct (2). The wind speed detection device (22) includes at least one of an online anemometer and a wind speed detection port. The online anemometer is used to automatically measure the wind speed in the return air duct (2), the wind speed detection port is used to manually measure the wind speed in the return air duct (2), and the air volume regulating valve (21) is used to regulate the air volume in the return air duct (2). The mass flow ratio of the air in the return air duct (2) to the dust transported in the dust collection duct (7) is 3 to 6. Includes a dust treatment device connected to the discharge port (35) of the gas separator (3); The dust treatment equipment includes a briquette press (4), which includes a dust collection box (41) and a briquette press body (40). The inlet of the dust collection box (41) is connected to the outlet (35) of the gas-material separator (3). The gas separator (3) also includes a discharge pipe (32) and an air lock (31) disposed between the gas separator body (30) and the discharge pipe (32). The discharge port (35) is the outlet of the discharge pipe (32). The gas separator body (30), the air lock (31), the discharge pipe (32) and the dust collection box (41) are arranged in order from top to bottom. The dust collection duct (7) also includes an air inlet (72) and a filter screen (71). All the dust collection inlets (73) of the dust collection duct (7) are located between the air inlet (72) and the dust outlet (74). The filter screen (71) is located at the air inlet (72) and is used to filter the air that carries dust.

2. The dust concentrated collecting device according to claim 1, characterized in that, The at least one dust collector also includes a second dust collector (1B), the dust collector inlet pipe (5) of the second dust collector (1B) being isolated from the outlet (24) of the return air pipe (2).

3. The dust concentrated collecting device according to claim 1, wherein The dust collector also includes a ash discharge valve (13) located at the bottom of the dust collector body (10), the dust discharge pipe (12) is connected to the ash discharge valve (13), and extends downward from the ash discharge valve (13) to the dust collection port (73) of the dust collection duct (7).

4. The dust concentrated collecting device according to claim 1, wherein The gas separator (3) includes a cyclone dust collector or a settling tank.

5. A method for collecting dust using a dust collection device according to any one of claims 1 to 4, characterized in that, include: Start at least one dust collector, including the first dust collector (1A); The dust discharged from at least one dust collector is centrally transported to the gas separator (3) through the dust collection duct (7). The air containing dust is separated by the air separator (3) to obtain the dust to be treated and the air after coarse dust removal; as well as The separated dust is collected and transported through the return air duct (2) to the first dust collector (1A) for further dust removal. The clean air after further dust removal is discharged to the outside of the dust collection device through the dust removal fan.

6. The dust concentrated collection method according to claim 5, wherein, The collection and separation of the dust to be treated includes the collection and separation of the dust to be treated using dust treatment equipment.

7. The dust concentrated collection method according to claim 6, wherein, The dust treatment equipment includes a bar press (4), and the dust collection method further includes using the bar press (4) to press the dust collected by the dust treatment equipment.

8. The dust concentrated collection method according to claim 5, wherein, Before the dust discharged from the dust collector is centrally transported to the gas separator (3) through the dust collection duct (7), the dust collection method includes: adjusting the wind speed in the return air duct (2) to the required dust transport wind speed.

9. The dust concentrated collection method according to claim 8, wherein, The required dust conveying velocity is 15~40m / s.

10. The dust concentrated collection method according to claim 5, wherein, When starting two or more dust collectors, including the first dust collector (1A), The first dust collector (1A) starts before the other dust collectors among the two or more dust collectors; or The first dust collector (1A) is started simultaneously with the remaining dust collectors among the two or more dust collectors.

11. The dust concentrated collection method according to claim 5, wherein, include: When dust stops entering the dust collector from outside the dust collection device, the first dust collector (1A) and the gas separator (3) stop after a certain period of time.

12. The dust concentrated collection method of claim 11, wherein, When two or more dust collectors, including the first dust collector (1A), are started, the first dust collector (1A) stops entering the dust collector from outside the dust collection device after the dust stops.

13. The dust concentrated collection method of claim 12, wherein, The delay time for the first dust collector (1A) and the gas separator (3) is 5 to 15 minutes.

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