Bag-type dust collector

Abstract

The utility model provides a bag-type dust collector which comprises a closed shell, a settling chamber and a bag chamber are arranged in the shell in parallel, an interception assembly is arranged on one side, far away from the bag chamber, of the settling chamber and comprises an interception channel and a plurality of layers of interception plates, one of the interception plates close to an air inlet is an outer interception plate, and the rest of the interception plates are inner interception plates. The outer intercepting plate and the inner intercepting plate are both of a pore plate structure, and openings larger than the holes are symmetrically formed in the two sides of the outer intercepting plate. Dust-containing waste gas needs to pass through the intercepting assembly and the settling chamber and then enters the bag chamber to be in contact with the cloth bag for dust removal. Wherein the intercepting assembly is internally provided with an outer intercepting plate and an inner intercepting plate, and a plurality of holes are formed in the intercepting hole plates, so that flue gas turbulence is facilitated, contact between organic components and chlorine salt and dust is enlarged, the dust adhered with the organic components and the chlorine salt is more easily adhered to the intercepting plates, and the organic components entering a bag chamber are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal equipment, in particular to a bag dust collector. Background Art

[0002] A bag filter is a dry dust filtration device suitable for capturing fine, dry, non-fibrous dust. Made of textile filter cloth or non-woven felt, the filter bags utilize the filtration properties of the fabric to filter dust-laden air. When dust-laden air enters the bag filter, large, high-density dust particles settle due to gravity and fall into the hopper. Finer dust particles are retained as they pass through the filter material, resulting in purification.

[0003] However, there are certain problems with using bag filters for some waste gases that are prone to water absorption and adhesion. For example, the pollutant components of copper-containing solid hazardous waste sintering flue gas are relatively complex. In addition to particulate matter, sulfur oxides, nitrogen oxides, and carbon monoxide, it also contains a large amount of organic components and chloride salts. Aromatic compounds (such as tar, etc.) are formed during the sintering process. During the drying process, part of them is ignited to provide heat for the sintering reaction, and the rest is carried out with the flue gas. When the temperature and humidity fluctuate, they will adhere to the bag filter, causing the filter bag resistance to rise rapidly; the chloride salts in them will absorb moisture and increase the resistance. These components will also penetrate the filter bag and adhere to the flue gas heat exchange element at the rear end, causing the heat exchange channel to become clogged and scaled; adhere to the surface of the denitrification catalyst, causing the catalyst to fail; and enter the desulfurization circulating slurry, causing the slurry to be poisoned.

[0004] Bag dust collector is the first line of defense for the terminal treatment of flue gas. The adhesion of organic components and the moisture absorption of chloride salts determine that they will quickly adhere to the surface of the filter bag after being entrained with particulate matter. Normal cleaning methods such as compressed air backblowing are not enough to remove them, resulting in a rapid increase in the resistance of the bag dust collector in a short period of time, forming "sticky bags", exceeding the fan boost range or causing excessive negative pressure, and the device is forced to shut down for maintenance.

[0005] To address this problem, existing technologies generally alleviate it by increasing the flue gas temperature and reducing the flue gas humidity. Other industries also have other methods such as direct combustion of flue gas and electrostatic tar capture. However, due to objective factors such as the nature of the raw materials and the sintering environment, this situation is difficult to stabilize.

[0006] Chinese patent application number CN201820874906.X proposes a bag-type dust collector that prevents bag sticking. The dust collector has an ash hopper at the bottom, an air inlet on one side, and filter bags installed inside the dust collector. The filter bags are connected to an upper housing via a venturi tube, and the upper portion of the upper housing has an air outlet. A loading port is located at the top of the ash hopper, and an adjustable feeding device is installed at the bottom of the hopper. This adjustable feeding device is connected to a dust spraying pipe located above the dust collector via a feed pipe. The feed system is powered by a feed fan, and the dust spraying pipe is installed inside the dust collector. The anti-bag-sticking bag-type dust collector's feed system includes a dry powder drying system. This utility model features a small footprint and a simple structure, addressing the problem of damp dust easily sticking to the bag. While drying is used to address the problem of particles adsorbing water, drying cannot completely solve the problem of organic particles adhering to the bag. For dust particles that are both organically adherent and hygroscopic to inorganic salts, a better bag-type dust collector is needed. Utility Model Content

[0007] In response to the deficiencies in the prior art, the present invention provides a bag dust collector, which solves the problem in the prior art that adhesive and hygroscopic particles adhere to the surface of the filter bag, causing the resistance of the bag dust collector to increase rapidly in a short period of time, forming a "sticky bag".

[0008] According to an embodiment of the present utility model, a bag dust collector includes a closed shell, wherein a settling chamber and a bag chamber are arranged side by side inside the shell, the settling chamber and the bag chamber are arranged side by side in a horizontal direction, and the two are connected front to back, the settling chamber is provided with an interception assembly on a side away from the bag chamber, the interception assembly includes an interception channel and a plurality of layers of interception plates arranged in the interception channel, the interception plates are arranged vertically in parallel, and an air inlet is provided at the top of the interception channel, so that the dust-laden gas entering the settling chamber passes through each interception plate in turn;

[0009] Among the intercepting plates, the one close to the air inlet is the outer intercepting plate, and the rest are inner intercepting plates. Both the outer intercepting plate and the inner intercepting plate are orifice plate structures with a number of evenly distributed holes on the surface. Openings are symmetrically arranged on both sides of the outer intercepting plate, and the aperture of the openings is much larger than the size of the holes.

[0010] Furthermore, a first ash hopper is correspondingly provided at the bottom of the settling chamber, and a second ash hopper is correspondingly provided at the bottom of the bag chamber. Both the first ash hopper and the second ash hopper are vertically arranged funnel-shaped structures.

[0011] Furthermore, the intercepting channel includes a horizontally arranged top plate and a bottom plate inclined from the outside to the inside, so that the vertical cross-sectional area of ​​the intercepting channel gradually increases from the outside to the inside, and the connection point between the bottom plate and the sedimentation chamber is close to the position above the first ash hopper.

[0012] Furthermore, the outer interception plate completely closes the interception channel, and an opening is provided between the bottom end of the inner interception plate and the bottom plate of the interception channel.

[0013] Furthermore, a dust cleaning component is provided between the outer intercepting plate and the inner intercepting plate adjacent thereto, and between adjacent inner intercepting plates. The dust cleaning component includes a rotating shaft arranged horizontally and parallel to the outer intercepting plate and the inner intercepting plate. One end of the rotating shaft extends out of the intercepting channel and is connected to a motor. The spacing between the rotating shaft and adjacent outer / inner intercepting plates is the same. Connecting rods perpendicular to each other are fixed on the rotating shaft. A striking hammer is rotatably installed at the end of the connecting rod. The length of the connecting rod is less than the spacing between the rotating shaft and adjacent outer / inner intercepting plates. The total length of the connecting rod and the striking hammer is greater than the spacing between the rotating shaft and adjacent outer / inner intercepting plates.

[0014] Furthermore, the diameter of the holes on the outer interception plate and the inner interception plate is 60-100 mm.

[0015] Furthermore, the apertures of the holes on the inner intercepting plate gradually decrease from top to bottom.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The utility model has a settling chamber and a bag chamber arranged in parallel. An interception assembly is also provided in the front of the settling chamber. The dust-laden exhaust gas must first pass through the interception assembly and the settling chamber before entering the bag chamber and contacting the bags for dust removal. The interception assembly has an outer interception plate and an inner interception plate. The interception plate is provided with a number of holes to facilitate flue gas turbulence, increase the contact between organic components and chloride salts and dust, and make dust adhered to organic components and chloride salts more likely to adhere to the interception plate, thereby effectively reducing the organic components entering the bag chamber.

[0018] 2. The outer interception plate of the present invention is provided with an opening, which can balance the flue gas velocity field while making the flue gas change direction and flow around the two-layer plate area, making it easier for organic components and chloride salts in the flue gas to collide with fly ash and be captured by the interception plate; correspondingly, the bottom of the second-layer interception plate is appropriately raised, leaving space between it and the bottom plate of the interception channel, thereby guiding the airflow to turn, creating collision conditions, and strengthening the self-cleaning of the flue gas accumulated at the bottom, allowing the particles on the interception plate to fall and quickly enter the settling chamber, thereby achieving the systematic removal of organic components and chloride salts, recovering part of the raw materials, and reducing costs;

[0019] 3. The utility model can significantly reduce the proportion of organic components and chloride salt content in the sintering of copper-containing hazardous waste through pre-bag chamber dust removal, thereby increasing the service life of the bags and the dust collection efficiency. At the same time, since the bags will not be clogged by a large amount of dust, the wind resistance of the flue gas passing through the bags is also reduced, thereby reducing the fan energy consumption during the operation of the device, and reducing the corrosion risk and scaling risk of subsequent equipment after the bag dust collector. Accordingly, the ash collected in the ash hopper of the settling chamber has an organic matter content 1-1.5 times higher and a chloride ion content 1.5-2.5 times higher than the ash collected in the ash hopper of the bag chamber. The reduction of organic components in the bags can reduce the risk of bag fire, reduce the subsequent RTO treatment load, and reduce the amount of organic components entering the desulfurization wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0021] Figure 2 Schematic diagram of the internal and external intercepting plates in an embodiment of the present utility model.

[0022] Figure 3 Schematic diagram of the inner interception plate in an embodiment of the present utility model.

[0023] Figure 4 This is a front view of the dust cleaning component in an embodiment of the present utility model.

[0024] Figure 5 It is a side view of the dust cleaning component in the embodiment of the present utility model.

[0025] In the above drawings: 1. Shell; 2. Sedimentation chamber; 3. Bag chamber; 4. First ash hopper; 5. Second ash hopper; 6. Interception channel; 7. Outer interception plate; 8. Inner interception plate; 9. Ash cleaning component; 71. Opening; 91. Rotating shaft; 92. Motor; 93. Bracket; 94. Connecting rod; 95. Strike hammer. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0027] like Figure 1 As shown, an embodiment of the utility model proposes a bag dust collector, comprising a closed shell 1, wherein a settling chamber 2 and a bag chamber 3 are arranged side by side inside the shell 1, the settling chamber 2 and the bag chamber 3 are arranged side by side in a horizontal direction, and the two are connected front to back, and the settling chamber 2 is provided with an interception assembly on the side away from the bag chamber 3, and the interception assembly includes an interception channel 6 and several layers of interception plates arranged in the interception channel 6, the interception plates are arranged vertically in parallel, and an air inlet is provided at the top of the interception channel 6, so that the incoming dust-laden gas passes through each interception plate in turn and enters the settling chamber 2.

[0028] Specifically, among the interception plates, the one close to the air inlet is the outer interception plate 7, and the rest are inner interception plates 8. In this embodiment, only one inner interception plate 8 is provided. The top of the interception orifice plate is suspended or otherwise supported, the middle is supported by a limit / guide, and the bottom can be guided or unsupported. Both the outer interception plate 7 and the inner interception plate 8 are orifice plate structures, with a number of evenly distributed holes on the surface, wherein openings 71 are symmetrically provided on both sides of the outer interception plate 7, and the aperture of the opening 71 is much larger than the size of the hole. The aperture of the holes on the outer interception plate 7 and the inner interception plate 8 is 60-100mm. In this embodiment, the aperture of the outer interception plate 7 is 80mm, and the aperture of the holes on the inner interception plate 8 gradually decreases from top to bottom, starting from 100mm and gradually decreasing by 5mm per layer. At the same time, the flow rate of the dust-laden airflow on the surface of the outer interception plate 7 is 1-2m / s, and the flow rate on the surface of the inner interception plate 8 is 0.6-1.2m / s.

[0029] Correspondingly, a first ash hopper 4 is provided at the bottom of the settling chamber 2, and a second ash hopper 5 is provided at the bottom of the bag chamber 3. Both the first ash hopper 4 and the second ash hopper 5 are vertically arranged funnel-shaped structures. They are used to collect dust particles deposited in the settling chamber 2 and the bag chamber 3, respectively.

[0030] Furthermore, the interception channel 6 includes a horizontally arranged top plate and a bottom plate arranged tilted from the outside to the inside, so that the vertical cross-sectional area of ​​the interception channel 6 gradually increases from the outside to the inside, and the connection point between the bottom plate and the settling chamber 2 is close to the position above the first ash hopper 4. The outer interception plate 7 completely encloses the interception channel 6, and an opening 71 is provided between the bottom end of the inner interception plate 8 and the bottom plate of the interception channel 6. Because the outer interception plate 7 completely encloses the interception channel 6, the airflow can only pass through the outer interception plate 7 through the holes and the opening 71. Because the holes are small, the airflow speed is reduced, which facilitates flue gas turbulence. The velocity distribution deviation of the airflow before and after the outer interception plate 7 is reduced from 43.2% to 19.7%. This increases the probability of organic components and chloride salts coming into contact with dust, and dust adhered to organic components and chloride salts is more likely to adhere to the interception plate. Even if the dust particles do not adhere to the interception plate, the organic components and chloride salts in the smoke that have agglomerated and enlarged in the interception channel 6 are more likely to achieve gravity sedimentation when entering the settling chamber 2, thereby improving the dust removal efficiency. At the same time, the size of the opening 71 is much larger than the hole, so that the airflow changes direction and flows around the two-layer plate area, making it easier for organic components and chloride salts in the flue gas to collide with fly ash and be captured by the interception plate.

[0031] Furthermore, in this embodiment, a dust cleaning assembly 9 is provided between the outer intercepting plate 7 and the adjacent inner intercepting plate 8, and between adjacent inner intercepting plates 8. The dust cleaning assembly 9 includes a rotating shaft 91 arranged horizontally and parallel to the outer intercepting plate 7 and the inner intercepting plate 8, and the rotating shaft 91 is fixed by a bracket 93. One end of the rotating shaft 91 extends out of the intercepting channel 6 and is connected to a motor 92. The rotating shaft 91 and the adjacent outer intercepting plates 7 and the inner intercepting plates 8 are spaced the same. A mutually perpendicular connecting rod 94 is fixedly provided on the rotating shaft 91, and a striking hammer 95 is rotatably mounted on the end of the connecting rod 94. The length of the connecting rod 94 is less than the distance between the rotating shaft 91 and the adjacent outer intercepting plates 7 and the inner intercepting plates 8, and the total length of the connecting rod 94 and the striking hammer 95 is greater than the distance between the rotating shaft 91 and the adjacent outer intercepting plates 7 and the inner intercepting plates 8.

[0032] When the motor 92 drives the rotating shaft 91 to rotate, the rotation drives the connecting rod 94 and the striking hammer 95 to rotate synchronously, causing the striking hammer 95 to expand due to the centrifugal force. Because the total length of the striking hammer 95 after extension is greater than the distance between the rotating shaft 91 and the outer interception plate 7 and the inner interception plate 8, it will strike the outer interception plate 7 or the inner interception plate 8. Then, the striking hammer 95 rotates and bends relative to the connecting rod 94 and passes close to the surface of the outer interception plate 7 or the inner interception plate 8. Then, it stretches again due to the centrifugal force and strikes the next outer interception plate 7 or the inner interception plate 8, thereby completing the reciprocating striking operation. Through the striking of the striking hammer 95, dust particles attached to the outer interception plate 7 or the inner interception plate 8 fall off and slide along the ground of the inclined interception channel 6 into the first ash hopper 4, realizing the systematic removal and collection of organic components and chloride salts.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A bag dust collector, characterized by: The invention comprises a closed shell, wherein a settling chamber and a bag chamber are arranged side by side inside the shell, the settling chamber and the bag chamber are arranged side by side in the horizontal direction, and the two are connected front to back, the settling chamber is provided with an interception assembly on the side away from the bag chamber, the interception assembly comprises an interception channel and a plurality of layers of interception plates arranged in the interception channel, the interception plates are arranged vertically side by side, and an air inlet is provided at the top of the interception channel, so that the dust-laden gas entering the settling chamber passes through each interception plate in turn; Among the intercepting plates, the one close to the air inlet is the outer intercepting plate, and the rest are inner intercepting plates. Both the outer intercepting plate and the inner intercepting plate are orifice plate structures with a number of evenly distributed holes on the surface. Openings are symmetrically arranged on both sides of the outer intercepting plate, and the aperture of the openings is much larger than the size of the holes.

2. A bag dust collector according to claim 1, characterized in that: A first ash hopper is correspondingly provided at the bottom of the settling chamber, and a second ash hopper is correspondingly provided at the bottom of the bag chamber. Both the first ash hopper and the second ash hopper are vertically arranged funnel-shaped structures.

3. A bag dust collector according to claim 2, characterized in that: The intercepting channel includes a horizontally arranged top plate and a bottom plate inclined from the outside to the inside, so that the vertical cross-sectional area of ​​the intercepting channel gradually increases from the outside to the inside, and the connection point between the bottom plate and the sedimentation chamber is close to the position above the first ash hopper.

4. A bag dust collector according to claim 3, characterized in that: The outer interception plate completely closes the interception channel, and an opening is provided between the bottom end of the inner interception plate and the bottom plate of the interception channel.

5. The bag dust collector according to claim 1, characterized in that: A dust cleaning component is also provided between the outer intercepting plate and the inner intercepting plate adjacent thereto, and between adjacent inner intercepting plates. The dust cleaning component includes a rotating shaft arranged horizontally and parallel to the outer intercepting plate and the inner intercepting plate. One end of the rotating shaft extends out of the intercepting channel and is connected to a motor. The spacing between the rotating shaft and adjacent outer / inner intercepting plates is the same. Connecting rods perpendicular to each other are fixed on the rotating shaft. A striking hammer is rotatably installed at the end of the connecting rod. The length of the connecting rod is less than the spacing between the rotating shaft and adjacent outer / inner intercepting plates. The total length of the connecting rod and the striking hammer is greater than the spacing between the rotating shaft and adjacent outer / inner intercepting plates.

6. The bag dust collector according to claim 1, characterized in that: The diameter of the holes on the outer interception plate and the inner interception plate is 60-100 mm.

7. The bag dust collector according to claim 1, characterized in that: The apertures of the holes on the inner intercepting plate gradually decrease from top to bottom.

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