Industrial bag-type dust collector with electrostatic ignition prevention function

Abstract

The utility model discloses an industrial bag-type dust collector with an anti-static ignition function, which comprises a dust collection chamber, a tubesheet is transversely arranged in the dust collection chamber, a plurality of cage ribs are sleeved at the lower part in the tubesheet, and cloth bags are sleeved outside the cage ribs; each cage framework corresponds to one first grounding wire, the lower part of the first grounding wire is detachably and conductively connected with the cage framework below the pattern plate, and the upper end of the first grounding wire extends out of a cage opening of the cage framework; the upper ends of all the first grounding wires are sequentially connected in series through a grounding trunk, and the head end and the tail end of the grounding trunk are respectively and fixedly connected to the pattern card; a stand column is arranged at the bottom of the dust removal chamber, provided with a grounding point and connected to the ground through a grounding component. Through the arrangement, reliable conductive connection between the cage framework and the tubesheet is realized, the cage framework is prevented from becoming an isolated conductor, and meanwhile, the anti-static ignition function of the industrial bag-type dust collector is realized in cooperation with grounding of the bottom upright posts.

Description

Technical Field

[0001] The utility model relates to the field of dust removal devices, in particular to an industrial bag dust collector with an anti-static ignition function. Background Art

[0002] Industrial bag dust collector is a gas-solid (dust) separation equipment. At present, the technology of using bag dust collector in the industrial field in my country is very mature, but industrial bag dust collector is prone to fire accidents.

[0003] The fundamental cause of fire in industrial bag dust collectors is dust ignition, which belongs to the category of powder science. The prevention and control of such fires must be analyzed from the perspective of the three elements of combustion (combustible materials, oxygen, and ignition sources). Common powder processing techniques for fires are grinding dust collection or drying dust collection. The materials involved are combustible dusts such as fly ash, carbon black, flour, starch, cork powder, coffee, organic amides, metal powders, etc. In particular, when the materials are organically volatile or combine with combustible gases or vapors to form a mixed mixture, the danger will increase, and more stringent systematic prevention and control measures must be taken. When the three elements are met at the same time, a fire accident is very likely to occur.

[0004] For industrial bag dust collectors, the most common problem is static electricity becoming an ignition source, igniting material dust. The mechanism of accidents caused by static electricity is as follows: Generally, the bag is first installed on the flower plate of the industrial bag dust collector, and the bag opening is stuck on the flower plate. Then the cage frame is placed below. When the cage frame is lowered into place, it presses on the bag opening. The upper edge of the cage frame presses on the flower plate to achieve grounding. However, in actual operation, this grounding method is not reliable. The reasons are analyzed as follows:

[0005] (1) Some flower plates are made of carbon steel and are painted to prevent rust. The conductivity of the paint has not been measured and confirmed.

[0006] (2) The opening of the flower plate is not ideally smooth, which affects the effective conductive contact with the cage frame.

[0007] (3) The processing accuracy of the flower plate diameter is not high, or the processing accuracy of the cloth bag size is not high, resulting in the cloth bag not being stuck properly and some of them falling off during operation.

[0008] (4) There is no margin or insufficient margin in the length of the cloth bag. When the temperature is slightly higher, the cloth bag shrinks, pushing up the cage frame, creating a gap with the flower plate, and the contact is not solid, so the cage frame forms an isolated conductor.

[0009] (5) There is material on the flower plate, which creates insulation between it and the upper edge of the cage frame or the resistance is too high.

[0010] (6) Some dust collectors also apply anti-rust paint (even conductive paint) to the cage frame. In this case, even if the powder is non-flammable, the situation becomes complicated and difficult to distinguish. Even if the resistance test is passed, static electricity may be transmitted and cause other hazards.

[0011] The above reasons may cause the cage to become an isolated conductor, which is strictly prohibited in electrostatic engineering. These reasons are more or less, and are not limited to the possibility of hidden dangers. Therefore, how to provide an industrial bag filter with anti-static ignition function, especially preventing the cage from becoming an isolated conductor, has become a goal that needs improvement in the current industry. Utility Model Content

[0012] The technical problem to be solved by the utility model is to provide an industrial bag dust collector with an anti-static ignition function, especially to prevent the cage frame from becoming an isolated conductor, thereby overcoming the shortcomings of the prior art.

[0013] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0014] An industrial bag dust collector with an anti-static ignition function includes a dust removal chamber, a flower plate is horizontally installed in the dust removal chamber, a plurality of cage frames are inserted downwardly into the flower plate, and the cage frames are all covered with bags;

[0015] Each cage frame corresponds to a first grounding wire, the lower portion of the first grounding wire is detachably and conductively connected to the cage frame below the flower plate, and the upper end of the first grounding wire extends out of the cage opening of the cage frame; the upper ends of all the first grounding wires are sequentially connected in series through a grounding trunk line, and the head end and tail end of the grounding trunk line are respectively fixedly connected to the flower plate;

[0016] A column is provided at the bottom of the dust removal chamber, and a grounding point is provided on the column and connected to the ground through a grounding component.

[0017] As a further improvement of the present invention, the upper end of the first grounding wire extends out of the cage mouth of the cage frame and is connected to the upper end of the first grounding wire of the adjacent cage frame, and the two form a group of grounding branches; the grounding main line is connected in series with the midpoint of each group of grounding branches in sequence, and each group of grounding branches is arranged perpendicular to the grounding main line.

[0018] Furthermore, the lower portion of the first grounding wire is connected and clamped to the cage frame below the flower plate through a stainless steel U-shaped clamp, and at least two of the stainless steel U-shaped clamps are arranged at a spacing of 60-100 mm.

[0019] Furthermore, the connection between the first grounding wire and the grounding trunk line is connected and clamped using a stainless steel U-shaped clamp.

[0020] Furthermore, the head end and tail end of the grounding trunk line are pressed into the flower plate by self-tapping hexagonal dovetail nails and flat washer rivets; the pressed-in part of the flower plate is polished and rust-removed; and the head end and tail end of the grounding trunk line have no less than two connection points.

[0021] Furthermore, the first grounding wire is 16mm 2 Copper braided wire; and / or, the grounding trunk adopts 16mm 2 Copper braided wire.

[0022] Furthermore, grounding points are provided on the two columns in the length direction of the industrial bag dust collector; the grounding components include grounding buried iron and 4# flat iron; the lower part of the grounding buried iron is inserted into the ground, and the exposed part is connected to the column through the 4# flat iron.

[0023] Furthermore, the grounding buried iron adopts a 2-2.4m stainless steel pipe, with two rows of holes with a diameter of 9-11mm distributed within 1m of the lower part at a spacing of 90-110mm, inserted into the ground, with 120-180mm exposed, and connected to the column through the 4# flat iron.

[0024] Furthermore, the operating ground at the bottom and surrounding of the industrial bag filter is paved with metal plates and is reliably grounded.

[0025] Furthermore, the bag opening of the cloth bag is stuck on the flower board, the cage frame is pressed on the bag opening when it is inserted into place, and the upper rolled edge of the cage opening of the cage frame is pressed on the flower board; a blowing pipe is also provided above the cloth bag.

[0026] By adopting the above technical solution, the utility model has at least the following beneficial effects:

[0027] 1. The utility model corresponds each cage frame to a first grounding wire, the lower part of the first grounding wire is detachably connected to the cage frame below the flower plate, and the upper end of the first grounding wire extends out of the cage opening of the cage frame; the upper ends of all the first grounding wires are connected in series in sequence through a grounding trunk line, and the head end and tail end of the grounding trunk line are respectively fixedly connected to the flower plate; through the above arrangement, a reliable conductive connection between the cage frame and the flower plate is achieved, preventing the cage frame from becoming an isolated conductor. At the same time, combined with the grounding at the bottom of the column, the anti-static ignition function of the industrial bag dust collector is realized.

[0028] 2. The midpoints of each group of grounding branches are connected in series through the grounding trunk line, and each group of grounding branches is arranged perpendicular to the grounding trunk line, making the overall wiring simple, economical, and the connection smooth and reliable.

[0029] 3. By setting a stainless steel U-shaped clamp, the connection can be made detachable, which is convenient for installation and disassembly according to actual needs.

[0030] 4. By using special grounding buried iron and 4# flat iron, reliable grounding of the bottom column can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Figure 1 This is a schematic diagram of the overall structure of an industrial bag dust collector with an anti-static ignition function in one embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the cage frame grounding wire connection and fastening structure;

[0034] Figure 3 It is a schematic diagram of the overall connection structure of the grounding branch and the trunk line;

[0035] In the figure: 1-dust removal chamber, 2-flower plate, 3-cage frame, 4-cloth bag, 5-air inlet pipe, 6-air inlet branch pipe, 7-gas collecting chamber, 8-air outlet pipe, 9-bin cover, 10-injection pipe, 11-cone, 12-discharging butterfly valve; 13-collecting bag, 14-column, 15-first grounding wire, 16-grounding trunk line, 17-stainless steel U-shaped clamp, 18-self-tapping hexagonal dovetail nail, 19-grounding buried iron, 20-4# flat iron, 21-metal plate. DETAILED DESCRIPTION

[0036] like Figure 1 As shown, the embodiment provides an industrial bag dust collector, the core part of which includes a dust removal chamber 1, a flower plate 2 is installed horizontally in the dust removal chamber 1, a plurality of cage frames 3 are set under the flower plate 2, and a cloth bag 4 is set outside the cage frames 3. Specifically, the following installation method can be preferred: the bag mouth of the cloth bag 4 is stuck on the flower plate 2, and the cage frames 3 are pressed on the bag mouth when they are put into place, and the upper rolled edge of the cage mouth of the cage frame 3 is pressed on the flower plate 2. This method may cause the cage frame 3 to be isolated during operation due to various reasons, forming an isolated conductor. In addition to the above core parts, in conjunction with Figure 1 As shown, a conventional industrial bag dust collector also includes an air inlet pipe 5, an air inlet branch pipe 6, an air collecting chamber 7, and an air outlet pipe 8. The dust-laden gas enters the dust removal chamber 1 through the air inlet pipe 5 and the air inlet branch pipe 6. The clean gas after dust removal and filtration is discharged through the air collecting chamber 7 and the air outlet pipe 8. There can be multiple dust removal chambers 1, each with a bin cover 9 on the top, and a blow pipe 10 is also provided inside the bag 4. Under certain working conditions, the blow pipe 10 is used to spray pulses to remove the dust on the bag 4. However, the friction and collision generated at this time are very easy to generate electricity, which is also a reason for the generation of static electricity. A cone 11 for collecting dust is also provided at the bottom of the dust removal chamber 1. The bottom of the cone 11 can be connected to the receiving bag 13 through the discharge butterfly valve 12. In addition, a column 14 for supporting the entire dust collector is also provided at the bottom of the dust removal chamber 1.

[0037] Article 5 of the General Provisions of the SH3097-2000 "Petrochemical Electrostatic Grounding Design Specification" (hereinafter referred to as the "Specification") stipulates that when designing process equipment or manufacturing equipment, conditions that could potentially lead to high-energy electrostatic discharges should be avoided as much as possible. This includes avoiding long, thin conductive protrusions and ungrounded isolated conductors within the container. However, due to design, manufacturing, or installation defects, and the fact that the bag 4 is a non-electrostatic conductor, combustible dust particles smaller than 75μm or even smaller are highly susceptible to charging under certain temperature and humidity conditions. The resulting discharge energy, which may not exceed 4mJ, could result in a brush-like discharge between the bag 4 and the cage 3, penetrating the bag 4 with moderate detonation potential; a spark discharge between the cage 3 and the panel 2 with strong detonation potential; or a propagating brush-like discharge between the bag 4 and the panel 2 with strong ignition and detonation potential. Under certain operating conditions, frequent pulsed spraying can easily lead to dust dissipation, friction, and collision, which is unavoidable. Possible solutions include reliable grounding to dissipate the charge, particularly preventing the cage 3 from forming an isolated conductor during operation.

[0038] Therefore, this embodiment adds a grounding part with an anti-static ignition function to the above-mentioned industrial bag dust collector.

[0039] Specifically, with Figure 2 、 3 As shown, each cage frame 3 corresponds to a first grounding wire 15, and the first grounding wire 15 is preferably 16mm 2 The lower portion of the first grounding wire 15 is detachably connected to the cage frame 3 below the flower plate 2, and the upper end of the first grounding wire 15 extends out of the cage frame 3; the upper end of the first grounding wire 15 is sequentially connected in series through the grounding trunk 16, and the head end and tail end of the grounding trunk 16 are respectively fixedly connected to the flower plate 2; the grounding trunk 16 preferably adopts 16mm 2 Copper braided wire.

[0040] As a preferred embodiment, Figure 3 As shown, the upper end of the first grounding wire 15 extends out of the cage opening of the cage frame 3 and connects to the upper end of the first grounding wire 15 of the adjacent cage frame 3, forming a set of grounding branches. The grounding trunk 16 is connected in series with the midpoint of each set of grounding branches, and each set of grounding branches is arranged perpendicular to the grounding trunk 16. This connection arrangement makes the overall wiring simple and economical, and the connection is smooth and reliable.

[0041] Cooperate Figure 2As shown, the lower part of the first grounding wire 15 is connected and clamped to the cage frame 3 below the flower plate 2 by a stainless steel U-shaped clamp 17. The stainless steel U-shaped clamp 17 is made of 304 stainless steel. Among them, at least two stainless steel U-shaped clamps 17 are arranged at a spacing of 60-100mm. As a preferred solution, this embodiment adopts two with a spacing of 80mm. Through the above arrangement, it is convenient to install and disassemble according to actual needs. Among them, the length of the first grounding wire 15 can be determined on-site according to the arrangement of the flower plate 2, but it needs to be batch processed before the cage frame 3 is installed. Correspondingly, the connection between the first grounding wire 15 and the grounding trunk 16 can also be connected and clamped with a stainless steel U-shaped clamp, that is, the stainless steel U-shaped clamp is used to connect and clamp at the cross intersection of the two (the connection between the grounding branch and the grounding trunk 16).

[0042] Cooperate Figure 3 As shown, the head end and tail end of the grounding trunk line 16 are preferably pressed into the flower plate by self-tapping hexagonal dovetail nails 18 and flat washers; the pressed-in part of the flower plate is polished and rust-removed; the head end and tail end of the grounding trunk line 16 have no less than two connection points. As a preferred embodiment, two are set in this embodiment.

[0043] In conjunction with the above grounding part, Figure 1 As shown, the columns 14 of the dust removal chamber 1 are provided with grounding points, which are connected to the earth via grounding components. Preferably, grounding points are provided on two columns 14 along the length of the industrial bag filter. The grounding components include a grounding buried iron 19 and a 4# flat iron 20. The lower portion of the grounding buried iron 19 is inserted into the ground, and the exposed portion is connected to the column 14 via the 4# flat iron 20. Specifically, the grounding buried iron 19 is a 2-2.4m stainless steel pipe with two rows of holes with a diameter of 9-11mm spaced 90-110mm apart within the lower 1m. The grounding buried iron 19 is inserted into the ground, with 120-180mm exposed above, and connected to the column via the 4# flat iron 20. As a preferred embodiment, in this embodiment, the grounding buried iron 19 is a 2.2m 304 stainless steel pipe with a diameter of 57mm. The lower portion is provided with two rows of holes with a diameter of 10mm spaced 100mm apart within the lower 1m. The grounding buried iron 19 is inserted into the ground, with 150mm exposed above, and connected to the column 14 via the 4# flat iron 20. Check that the grounding resistance is lower than 1000Ω, and inject a proper amount of salt water into the flower tube mouth of the grounding buried iron 19 inserted into the ground to increase the conductivity.

[0044] The above arrangement realizes a reliable conductive connection between the cage frame 3 and the flower plate 2, preventing the cage frame 3 from becoming an isolated conductor during operation. At the same time, combined with the grounding at the bottom of the column 14, the anti-static ignition function of the industrial bag dust collector is realized.

[0045] In order to further improve the conductivity, a metal plate 21 is laid on the operating ground at the bottom and surrounding of the industrial bag filter, such as a 2-3 mm steel plate, and is reliably grounded.

[0046] In summary, the utility model provides an industrial bag dust collector with anti-static ignition function. On the basis of conventional industrial bag dust collector, it adds a reliable grounding method, especially preventing the cage frame from becoming an isolated conductor, and preventing static electricity from becoming an ignition source to ignite material dust.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Those skilled in the art can make some simple modifications, equivalent changes or modifications based on the technical content disclosed above, which fall within the scope of protection of the present invention.

Claims

1. An industrial bag dust collector with anti-static ignition function, comprising a dust removal chamber, wherein a flower plate is horizontally installed in the dust removal chamber, wherein a plurality of cage frames are set under the flower plate, and the outer surface of each cage frame is covered with a bag; characterized in that: Each cage frame corresponds to a first grounding wire, the lower portion of the first grounding wire is detachably and conductively connected to the cage frame below the flower plate, and the upper end of the first grounding wire extends out of the cage opening of the cage frame; the upper ends of all the first grounding wires are sequentially connected in series through a grounding trunk line, and the head end and tail end of the grounding trunk line are respectively fixedly connected to the flower plate; A column is provided at the bottom of the dust removal chamber, and a grounding point is provided on the column and connected to the ground through a grounding component.

2. The industrial bag dust collector with anti-static ignition function according to claim 1 is characterized in that: The upper end of the first grounding wire extends out of the cage opening of the cage frame and is connected to the upper end of the first grounding wire of the adjacent cage frame, and the two form a set of grounding branches; The grounding trunk is connected in series with the midpoint of each group of grounding branches in sequence, and each group of grounding branches is arranged perpendicular to the grounding trunk.

3. The industrial bag dust collector with anti-static ignition function according to claim 1 is characterized in that: The lower part of the first grounding wire is connected and clamped to the cage frame below the flower plate through a stainless steel U-shaped clamp, and at least two stainless steel U-shaped clamps are arranged with a spacing of 60-100mm.

4. The industrial bag dust collector with anti-static ignition function according to claim 1 is characterized in that: The connection between the first grounding wire and the grounding trunk is clamped with a stainless steel U-shaped clamp.

5. The industrial bag dust collector with anti-static ignition function according to claim 1 is characterized in that: The head end and tail end of the grounding trunk line are pressed into the flower plate by self-tapping hexagonal dovetail nails and flat rivets; the pressed-in part of the flower plate is polished and rust-removed; and the head end and tail end of the grounding trunk line have no less than two connection points.

6. The industrial bag dust collector with anti-static ignition function according to any one of claims 1 to 5, characterized in that: The first grounding wire is 16mm 2 copper braided wire; And / or, the grounding trunk adopts 16mm 2 Copper braided wire.

7. The industrial bag dust collector with anti-static ignition function according to any one of claims 1 to 5, characterized in that: Grounding points are provided on two upright posts in the length direction of the industrial bag dust collector; The grounding component includes a grounding buried iron and a 4# flat iron; the lower part of the grounding buried iron is inserted into the ground, and the upper exposed part is connected to the column through the 4# flat iron.

8. The industrial bag dust collector with anti-static ignition function according to claim 7, characterized in that: The grounding buried iron adopts a 2-2.4m stainless steel pipe, with two rows of holes with a diameter of 9-11mm distributed within 1m of the lower part at a spacing of 90-110mm. It is inserted into the ground with 120-180mm exposed above and connected to the column through the 4# flat iron.

9. The industrial bag dust collector with anti-static ignition function according to any one of claims 1 to 5, characterized in that: The bottom of the industrial bag dust collector and the surrounding operating ground are paved with metal plates and are reliably grounded.

10. The industrial bag dust collector with anti-static ignition function according to any one of claims 1 to 5, characterized in that: The bag opening of the cloth bag is stuck on the flower board, and the cage frame is pressed on the bag opening when it is in place, and the upper rolled edge of the cage opening of the cage frame is pressed on the flower board; a blowing pipe is also provided above the cloth bag.

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