Dust remover upper box body and dust remover system

Abstract

The invention relates to an upper box body of a dust remover and a dust remover system. An upper cover covers the upper end of a main body of the upper box body and seals the upper end of the main body of the upper box body; a sealing cavity is formed between the first layer of sealing plate and the second layer of sealing plate of the upper cover, and gas can be introduced into the sealing cavity through the gas inlet, so that the gas pressure in the sealing cavity is increased to a preset value. Therefore, according to the upper box body of the dust remover, the micro-positive pressure of the upper cover can be kept in a normal state, the possibility that external air enters the upper box body of the dust remover is greatly reduced, the maintenance cost of the dust remover is reduced, and the service life of the dust remover is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas treatment, and in particular to a dust collector upper box and a dust collector system. Background Art

[0002] The flue gas from the incineration of solid waste such as domestic garbage, hazardous waste, and sludge contains a large amount of hydrogen chloride gas, sulfur dioxide gas, and moisture. Although insulation and heating measures are taken during the operation of conventional high-temperature bag dust collectors, condensation still often causes problems such as shell rust, blowpipe corrosion, and filter bag failure, which seriously affect the dust removal and even the safe and reliable operation of the entire system.

[0003] In the prior art, the welded fixed insulation of the original single-layer structure of the upper cover of the bag filter is cancelled, and a multi-layered movable insulation layer is provided between the inner and outer covers, thereby improving the internal corrosion caused by defects in insulation and welding, and improving the service life of the dust collector. However, the problem of micro-leakage of the double-layer upper cover has not been fundamentally solved. At the same time, when the dust collector is running, the insulating rock wool blanket in the double-layer upper cover also absorbs corrosive water vapor from external cold air and internal high-temperature and high-humidity combustion flue gas. After absorbing water, the weight of the insulating rock wool blanket increases significantly, the physical properties decrease, and bacteria grow, which increases the maintenance cost and easily endangers the health of maintenance personnel. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a dust collector upper box, a dust collector system and a control method thereof to solve the problems existing in the dust collector in the background technology.

[0005] In a first aspect, an embodiment of the present application provides an upper box of a dust collector, comprising:

[0006] An upper box body, the upper box body is used to connect to a main fan to discharge the gas after dust removal, and the lower end of the upper box body is used to connect to a dust removal box;

[0007] An upper cover, which covers the upper end of the upper box body to seal the upper end of the upper box body; the upper cover includes a first sealing plate and a second sealing plate, the first sealing plate forms the top of the upper cover, the second sealing plate forms the bottom of the upper cover, the first sealing plate and the second sealing plate are both embedded and installed inside the upper end of the upper box body, and the interlayer between the first sealing plate and the second sealing plate forms a sealed cavity; one side of the upper box body or the upper cover is provided with an air inlet, through which gas can be continuously introduced into the sealed cavity to increase the air pressure in the sealed cavity to a preset size.

[0008] In an optional embodiment, the dust collector upper box also includes a pressure gauge for measuring the air pressure in the sealed cavity.

[0009] In an optional embodiment, the pressure gauge is a pointer-type micro-differential pressure gauge or a U-type pressure gauge.

[0010] In a second aspect, an embodiment of the present application provides a dust collector system, including the dust collector upper box 300 described in the first aspect, and also including a dust removal box, a main fan, a dust collector outlet duct, a main fan outlet duct and a hot air circulation duct;

[0011] The dust removal box is connected to the lower end of the upper box of the dust collector, and the gas after dust removal by the dust removal box flows into the upper box of the dust collector;

[0012] The air inlet end of the main fan is connected to the upper box body through the dust collector outlet pipe, and is used to extract the gas in the upper box body, and the exhaust end of the main fan discharges the gas through the main fan outlet pipe;

[0013] The air inlet end of the hot air circulation duct is connected to the main air fan outlet duct, and the exhaust end of the hot air circulation duct is connected to the air inlet.

[0014] In an optional embodiment, the dust collector system further includes a regulating valve connected to the hot air circulation duct, and the regulating valve is used to adjust the flow of the hot air circulation duct.

[0015] In an optional embodiment, the hot air circulation duct is a tapered duct, with the air inlet end of the hot air circulation duct as the starting point, and within a certain length, the inner diameter of the hot air circulation duct gradually decreases along the air flow direction thereof.

[0016] In an optional embodiment, the hot air circulation duct includes several branches, any of the branches is provided with the regulating valve, the sealed cavity is divided into several chambers, any of the branches is connected to the corresponding chamber, and the regulating valve provided on any of the branches can be opened and closed independently.

[0017] In an optional embodiment, the hot air circulation duct is coated with a first thermal insulation layer.

[0018] In an optional embodiment, the exterior of the dust collector upper box and the dust removal box is coated with a second thermal insulation layer.

[0019] In an optional embodiment, the dust collector system further includes a booster fan, which is connected to the hot air circulation duct.

[0020] In a third aspect, an embodiment of the present application provides a control method for a dust collector system, using the dust collector system described in the second aspect, comprising the following steps:

[0021] A preset proportion of the total amount of gas exhausted from the main blower outlet pipe is introduced into the sealed cavity through the hot air circulation duct.

[0022] In an optional embodiment, the control method of the dust collector system provided in the embodiment of the present application includes the following steps:

[0023] A regulating valve is connected to the hot air circulation duct, the flow rate of the hot air circulation duct is adjusted by the regulating valve, and the pressure in the sealed cavity is monitored by a pressure gauge;

[0024] When the pressure value measured by the pressure gauge reaches a preset range, the regulating valve is stopped from being adjusted.

[0025] The dust collector upper box and dust collector system provided in the embodiment of the present application have an upper cover covering the upper end of the upper box body to seal the upper end of the upper box body; a sealed cavity is formed between the first and second sealing plates of the upper cover, and gas can be introduced into the sealed cavity through the air inlet to increase the air pressure in the sealed cavity to a preset value. Therefore, the upper cover can maintain a slight positive pressure under normal conditions, greatly reducing the possibility of external air entering the upper box of the dust collector, reducing the maintenance cost of the dust collector, and extending the service life of the dust collector.

[0026] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 A schematic diagram of the structure of a dust collector system provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of the cross-sectional structure of the upper box of the dust collector provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of the layout of multiple compartments of a sealed cavity provided in an embodiment of the present application.

[0031] The reference numerals in the figure are:

[0032] 1. Upper box body;

[0033] 2. Upper cover; 20. Sealed cavity; 21. Air inlet; 22. Sub-chamber;

[0034] 3. Pressure gauge;

[0035] 100, dust removal box; 101, air inlet; 102, second insulation layer; 103, ash discharge valve;

[0036] 200, main fan;

[0037] 300, dust collector upper box; 301, air outlet; 302, first sealing plate; 303, second sealing plate;

[0038] 400. Dust collector air outlet duct;

[0039] 500, main fan air outlet duct;

[0040] 600, hot air circulation duct;

[0041] 700, regulating valve;

[0042] 800. Exhaust duct. DETAILED DESCRIPTION

[0043] In order to make the technical solutions and beneficial effects of the present invention more clearly understandable, the following is a detailed description by listing specific embodiments. The drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0044] In the description of the present invention, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of simplified description of the present invention, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation to the present invention.

[0045] In the present invention, the terms "first" and "second" are only used for the purpose of clear description and cannot be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly include at least one of the features. In the description of the present invention, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly defined, the terms "install", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly defined, a first feature being “on”, “above”, “above”, “below”, “below”, “below” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact with each other through an intermediate medium. Moreover, a first feature being “on”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0048] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0049] The dust collector is a gas purification device, and its working principle is: the dust collector outlet pipe 400 is connected to the main fan 200 as a power source. When the main fan 200 is started, the gas to be purified can enter from the air inlet 101 of the dust collector, and is filtered and processed by the dust removal box 100 of the dust collector. The purified gas reaches the upper box 300 of the dust collector, and then flows to the dust collector outlet pipe 400 through the air outlet 301 of the dust collector, and then is discharged through the inside of the main fan 200, the main fan outlet pipe 500 and the exhaust pipe 800 in sequence. The retained dust is discharged from the dust discharge valve 103 at the bottom of the dust removal box 100. The dust collector includes a dust collector box 100 and an upper box 300 of the dust collector. The upper box 300 of the dust collector is usually not an integrated structure due to the needs of disassembly, maintenance, and inspection. There are some seams between the wall of the upper box body 1 of the upper box 300 of the dust collector and the edge of the upper cover 2. When the dust collector is running, since the upper box 300 of the dust collector is close to the air outlet 301, there is a relatively obvious slight negative pressure. The above-mentioned seams are easily penetrated by external cold air, causing condensation and corrosion inside the upper box 300 of the dust collector.

[0050] The present application embodiment provides a dust collector upper box 300, such as Figure 1 , Figure 2 As shown, it includes an upper box body 1 and an upper cover 2. The upper box body 1 is used to connect to the main fan 200 to exhaust the dust-removed gas, and the lower end of the upper box body 1 is used to connect to the dust removal box 100; the upper cover 2 covers the upper end of the upper box body 1 to seal the upper end of the upper box body 1.

[0051] The upper cover 2 of this embodiment includes a first sealing plate 302 and a second sealing plate 303, wherein the first sealing plate 302 forms the top of the upper cover 2, and the second sealing plate 303 forms the bottom of the upper cover 2. The first sealing plate 302 and the second sealing plate 303 are both embedded and installed inside the upper end of the upper box body 1, and the interlayer between the first sealing plate 302 and the second sealing plate 303 forms a sealed cavity 20. An air inlet 21 is provided on one side of the upper box body 1, and the position where the air inlet 21 is located is connected to the sealed cavity 20. In other embodiments, the air inlet 21 can also be provided on the first sealing plate 302 or the second sealing plate 303, or the outer layer of the upper cover 2 is closed as a whole, and a sealed cavity 20 is formed inside, and the air inlet 21 is provided on the outer layer of the upper cover 2.

[0052] Gas can be introduced into the sealed cavity 20 through the gas inlet 21 to increase the gas pressure in the sealed cavity 20 .

[0053] The dust collector upper box 300 provided in the embodiment of the present application can increase the air pressure in the sealed cavity 20 to a preset value by introducing air into the sealed cavity 20 through the air inlet 21 during operation. Therefore, the upper cover 2 can maintain a slight positive pressure under normal conditions, greatly reducing the possibility of external air entering the dust collector upper box 300, reducing the maintenance cost of the dust collector, and extending the service life of the dust collector.

[0054] The dust collector upper box 300 provided in this embodiment has the principle of preventing air leakage as follows: Figure 2As shown, the upper end of the upper box body 1 is sealed by the upper cover 2, one side of the upper box body 1 is connected to the main fan 200, and the lower end is connected to the dust removal box 100. Therefore, the high-temperature gas purified by the dust removal box 100 circulates in the purification area of ​​the upper box body 1, and a slight negative pressure is formed in the purification area of ​​the upper box body 1. At this time, it is necessary to prevent cold air from entering the purification area of ​​the upper box body 1 to form condensation. For the external air to enter the purification area of ​​the upper box body 1, it needs to pass through the joint between the upper cover 2 and the inner wall structure of the upper box body 1. In this embodiment, when the upper box body 300 of the dust collector is in operation, gas is introduced into the sealed cavity 20 through the air inlet 21, which can increase the air pressure in the sealed cavity 20 to form a slight positive pressure, and continuously introduce gas into the sealed cavity 20, which can keep the air pressure in the sealed cavity 20 slightly positive, and it is difficult for external air to enter the joint. The slightly positive pressure refers to the air pressure slightly greater than the ambient atmospheric pressure of the factory where the dust removal equipment is located, which is generally calculated based on information such as geographical location and altitude. On the other hand, since the sealed cavity 20 forms a slight positive pressure, gas will leak into the purification area of ​​the upper box body 1, but the gas introduced into the sealed cavity 20 is artificially selectable, as long as the gas that is harmless to the purified gas is selected. It can be seen that in the dust collector upper box 300 provided in this embodiment, when the purified high-temperature gas circulates in the upper box body 1, it is not easily affected by the leakage of external cold air, and the condensation in the upper box body 1, as well as the problems of component corrosion and bacterial damage caused by it, can be significantly improved.

[0055] In an optional embodiment, the dust collector upper box 300 also includes a pressure gauge 3 for measuring the air pressure in the sealed cavity 20. In this embodiment, the pressure gauge 3 can be provided to monitor the air pressure in the sealed cavity 20, so as to ensure that the pressure of the sealed cavity 20 is visualized during the operation of the dust collector, so as to avoid the failure to timely discover the damage or failure of the micro-positive pressure gas supply environment, or to facilitate the quantification of the micro-positive pressure environment and the calculation of the flow rate required for the gas to be introduced. The pressure gauge 3 can be connected to the upper cover 2, or to the side wall of the upper box body 1.

[0056] In an optional embodiment, the pressure gauge 3 is a pointer-type micro differential pressure gauge or a U-type pressure gauge. The pointer-type micro differential pressure gauge can accurately display the measured pressure and is suitable for occasions with high pressure measurement accuracy requirements. The U-type pressure gauge has a simple structure and low cost and is suitable for occasions with low pressure measurement accuracy requirements. The technician can select a suitable pressure gauge 3 according to specific needs.

[0057] In an optional embodiment, if Figure 1 As shown, the dust collector provided in this embodiment is coated with a second thermal insulation layer 102 on the outside, which can have a thermal insulation effect on the temperature of the internal circulating gas.

[0058] This embodiment provides a dust collector system, such as Figure 1As shown, it includes the above-mentioned dust collector upper box 300, and also includes a dust removal box 100, a main fan 200, a dust collector outlet pipe 400, a main fan outlet pipe 500 and a hot air circulation duct 600. The dust removal box 100 is connected to the lower end of the dust collector upper box 300, and the gas after dust removal by the dust removal box 100 flows into the dust collector upper box 300; the air inlet end of the main fan 200 is connected to the upper box body 1 through the dust collector outlet pipe 400, which is used to extract the gas in the upper box body 1, and the exhaust end of the main fan 200 exhausts the gas through the main fan outlet pipe 500; the air inlet end of the hot air circulation duct 600 is connected to the main fan outlet pipe 500, and the exhaust end of the hot air circulation duct 600 is connected to the air inlet 21.

[0059] The dust collector system provided in this embodiment adopts the above-mentioned dust collector upper box 300. During operation, gas is introduced into the sealed cavity 20 through the air inlet 21, which can increase the air pressure in the sealed cavity 20. Therefore, the upper cover 2 can maintain a slightly positive pressure under normal conditions, greatly reducing the possibility of external air entering the upper box 300 of the dust collector, reducing the maintenance cost of the dust collector, and extending the service life of the dust collector. When the gas is introduced into the sealed cavity 20, the gas exhausted from the main fan outlet duct 500 is utilized and introduced into the sealed cavity 20 through the hot air circulation duct 600. The exhaust gas is reused without introducing a new gas source, which reduces the process cost, and the temperature of the reused gas is also relatively high, which is not easy to cause condensation of gas in the upper box body 1.

[0060] In an optional embodiment, if Figure 1 As shown, the dust collector system further includes a regulating valve 700 connected to the hot air circulation duct 600, and the regulating valve 700 is used to adjust the flow of the hot air circulation duct 600. In this embodiment, the engineer can adjust the opening of the regulating valve 700 according to the preset pressure of the sealed cavity 20 to ensure that the sealed cavity 20 reaches a slight positive pressure of the preset pressure.

[0061] In an optional embodiment, the hot air circulation duct 600 is a tapered tube, with the air inlet end of the hot air circulation duct 600 as the starting point, and within a certain length, the inner diameter of the hot air circulation duct 600 gradually decreases along the air flow direction. In this embodiment, the hot air circulation duct 600 adopts a tapered tube, which can make the channel of the circulating gas into a structure that changes from large to small, so that the flow rate of the gas in the channel per unit time gradually decreases, so that on the one hand, only a small amount of required gas is introduced into the sealed cavity 20, and on the other hand, it is easy to make the pressure of the gas to be introduced into the sealed cavity 20 gradually increase in the hot air circulation duct 600.

[0062] In an optional embodiment, if Figure 3As shown, the hot air circulation duct 600 includes 4 branches, any branch is provided with a regulating valve 700, the sealed cavity 20 is divided into 4 chambers 22, any branch is connected to the corresponding chamber 22, and the regulating valve 700 provided on any branch can be opened and closed independently. In this embodiment, the sealed cavity 20 is divided into 4 chambers 22, any chamber 22 is connected to an independent branch of the hot air circulation duct 600, and is provided with an independent regulating valve 700. Therefore, the gas entry into any chamber 22 can be controlled manually and individually, so that when an individual chamber 22 needs to be offline for maintenance, the regulating valve 700 of the chamber 22 can be completely closed individually without affecting the hot air supply of other chambers 22. It can be understood that the number of chambers 22 is not limited to 4, and can be 2, 3, 6, 8, 9 or more.

[0063] In an optional embodiment, in the dust collector system of this embodiment, the hot air circulation duct 600 is coated with a first thermal insulation layer, which can enable the circulating hot air flow to maintain a high temperature in the hot air circulation duct 600, thereby reducing the risk of condensation when passing into the sealed cavity 20.

[0064] In an optional embodiment, the dust collector system of this embodiment is further provided with a booster fan, which is connected to the hot air circulation duct 600 and is used to pressurize the gas flowing in the hot air circulation duct 600 and speed up the gas transmission speed, so as to increase the upper limit of the amount of gas that can flow through the hot air circulation duct 600 and avoid the situation where the amount of gas entering the sealed cavity 20 is insufficient.

[0065] The present embodiment provides a control method for a dust collector system, which adopts the above-mentioned dust collector system, and includes the following steps: a preset proportion of the total amount of gas discharged from the main fan outlet pipe 500 is passed into the sealed cavity 20 through the hot air circulation duct 600. In this embodiment, the gas flow rate passed into the sealed cavity 20 is determined by the proportion of the total amount of gas discharged from the main fan outlet pipe 500, which is conducive to matching dust removal work of various scales, for example, 2% to 5% of the gas discharged from the main fan outlet pipe 500 is passed into the sealed cavity 20. It can be understood that for different dust removal work, in order to meet the need of micro-positive pressure in the sealed cavity 20, the amount of gas required to be passed into the sealed cavity 20 is different. Therefore, the proportion of gas passed into the sealed cavity 20 is not limited to 2% to 5% of the gas discharged from the main fan outlet pipe 500, and can be 1% to 2% or less than 1%, or can be greater than 5%, such as 6%, 8% or even higher.

[0066] The control method of the dust collector system provided in this embodiment adopts the above-mentioned dust collector system. During operation, gas is introduced into the sealed cavity 20 through the air inlet 21, which can increase the air pressure in the sealed cavity 20. Therefore, the upper cover 2 can maintain a slightly positive pressure under normal conditions, greatly reducing the possibility of external air entering the upper box 300 of the dust collector, reducing the maintenance cost of the dust collector, and extending the service life of the dust collector. The gas flow rate introduced into the sealed cavity 20 is determined by the ratio of the total amount of gas discharged from the main fan outlet pipe 500, which is conducive to matching dust removal work of various sizes.

[0067] In an optional embodiment, the control method of the dust collector system of this embodiment includes the following steps: connecting the regulating valve 700 to the hot air circulation duct 600, connecting the pressure gauge 3 to the upper cover 2, adjusting the flow of the hot air circulation duct 600 through the regulating valve 700, and monitoring the pressure in the sealed cavity 20 through the pressure gauge 3; until the pressure value measured by the pressure gauge 3 reaches the preset range, stop adjusting the regulating valve 700. In this embodiment, the pressure in the sealed cavity 20 is monitored by the pressure gauge 3. When the pressure in the monitored sealed cavity 20 reaches the preset value, it means that the current pressure in the sealed cavity 20 meets the micro-positive pressure requirement, and the specific size of the pressure is adjusted by the regulating valve 700, which has high adjustability. The regulating valve 700 can be adjusted manually, and the engineer manually adjusts it according to the measured value of the pressure gauge 3; the regulating valve 700 can also be adjusted by PID, selecting the regulating valve 700 that supports electrical signal control and the pressure gauge 3 that supports electrical signal transmission, so that the measured value of the pressure gauge 3 directly and automatically adjusts the opening of the regulating valve 700. When the hot air circulation duct 600 includes multiple branches, any branch is provided with a regulating valve 700, the sealed cavity 20 is divided into a corresponding number of chambers 22, any branch is connected to the corresponding chamber 22, and the regulating valve 700 provided on any branch can be opened and closed independently.

[0068] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present application that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present application and do not limit the scope of protection of the patent of this application.

Claims

1. A dust collector upper box, characterized in that: include: An upper box body (1), the upper box body (1) being used to connect to a main fan (200) to discharge the gas after dust removal, and the lower end of the upper box body (1) being used to connect to a dust removal box (100); An upper cover (2), the upper cover (2) covers the upper end of the upper box body (1) to seal the upper end of the upper box body (1); the upper cover (2) comprises a first sealing plate (302) and a second sealing plate (303), the first sealing plate (302) forming the top of the upper cover (2), the second sealing plate (303) forming the bottom of the upper cover (2), the first sealing plate (302) and the second sealing plate (303) both being embedded and installed inside the upper end of the upper box body (1), the interlayer between the first sealing plate (302) and the second sealing plate (303) forming a sealed cavity (20); one side of the upper box body (1) or the upper cover (2) is provided with an air inlet (21), through which gas can be continuously introduced into the sealed cavity (20) so that the air pressure in the sealed cavity (20) is increased to a preset value.

2. The dust collector upper box according to claim 1, characterized in that: The dust collector upper box (300) also includes a pressure gauge (3) for measuring the air pressure in the sealed cavity (20).

3. The dust collector upper box according to claim 2, characterized in that: The pressure gauge (3) is a pointer-type micro-differential pressure gauge or a U-shaped pressure gauge.

4. A dust collector system, characterized in that: It comprises the dust collector upper box (300) as claimed in any one of claims 1 to 3, and also comprises a dust removal box (100), a main fan (200), a dust collector air outlet duct (400), a main fan air outlet duct (500) and a hot air circulation duct (600); The dust removal box (100) is connected to the lower end of the dust collector upper box (300), and the gas after dust removal by the dust removal box (100) flows into the dust collector upper box (300); The air inlet end of the main fan (200) is connected to the upper box body (1) through the dust collector air outlet pipe (400) and is used to extract the gas in the upper box body (1), and the air outlet end of the main fan (200) discharges the gas through the main fan air outlet pipe (500); The air inlet end of the hot air circulation duct (600) is connected to the main air blower outlet duct (500), and the air outlet end of the hot air circulation duct (600) is connected to the air inlet (21).

5. The dust collector system according to claim 4, characterized in that The dust collector system further comprises a regulating valve (700) connected to the hot air circulation duct (600), wherein the regulating valve (700) is used to regulate the flow of the hot air circulation duct (600).

6. The dust collector system according to claim 5, characterized in that The hot air circulation duct (600) is a tapered duct. With the air inlet end of the hot air circulation duct (600) as the starting point, within a certain length, the inner diameter of the hot air circulation duct (600) gradually decreases along the air flow direction thereof.

7. The dust collector system according to claim 5 or 6, characterized in that: The hot air circulation duct (600) includes a plurality of branches, any of which is provided with the regulating valve (700), the sealed cavity (20) is divided into a plurality of chambers (22), any of which is connected to the corresponding chamber (22), and the regulating valve (700) provided on any of which can be opened and closed independently.

8. The dust collector system according to any one of claims 4 to 6, characterized in that: The hot air circulation duct (600) is coated with a first thermal insulation layer.

9. The dust collector system according to any one of claims 4 to 6, characterized in that: The exterior of the dust collector upper box (300) and the dust removal box (100) is coated with a second thermal insulation layer (102).

10. The dust collector system according to any one of claims 4 to 6, characterized in that: The dust collector system also includes a booster fan, which is connected to the hot air circulation duct (600).

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