Bag-type dust collector with spark capturing function

Abstract

This invention relates to a baghouse dust collector with spark capture function, comprising a bag chamber, a smoke box disposed on the side of the bag chamber for introducing flue gas with a predetermined flow direction into the bag chamber; a spark capture device and a filtration device, the spark capture device comprising: multiple baffle assemblies provided for intercepting sparks in the flue gas; the filtration device comprising: multiple filter bags for filtering the flue gas, the baffle assemblies and the filter bags being arranged sequentially along the flue gas flow direction inside the bag chamber; an ash hopper disposed at the bottom of the bag chamber for collecting settled ash; and an outlet flue disposed at the top of the bag chamber for discharging the filtered flue gas. This application organically combines the spark capture device and the baghouse dust collector into a single unit, resulting in a compact structure, particularly suitable for purifying high-temperature flue gas containing sparks, with low investment, reliable operation, and convenient implementation.

Description

Technical Field

[0001] This invention belongs to the technical field of industrial dust removal, and particularly relates to a bag filter with spark capture function. Background Technology

[0002] Industrial kilns, power plant boilers, and heating boilers produce flue gas containing dust. Baghouse dust collectors are typically used to separate the dust from the flue gas, purifying it to meet emission standards. However, these flue gases often contain unburned sparks. If these sparks enter the baghouse dust collector and are trapped by the filter bags, they can accumulate on the filter bag surface, potentially burning holes in the bags or even causing a fire that destroys the entire dust collector.

[0003] To prevent such situations from occurring, a pre-dust collector, such as a gravity dust collector, cyclone dust collector, or multi-tube dust collector, is usually added before the bag filter. This series configuration requires a large layout space, has high system resistance, and is inconvenient to operate. Especially in retrofit projects, the available layout space is small, and the fan head margin is not large. Under these conditions, this solution is difficult to implement. Summary of the Invention

[0004] This invention provides a bag filter with spark capture function to solve the technical problems of large overall layout, high system resistance, and inconvenient operation of existing dust collection equipment.

[0005] To solve the above problems, the bag filter with spark capture function provided by the present invention adopts the following technical solution:

[0006] A bag filter with spark capture function, comprising:

[0007] A bag chamber, wherein a smoke box is provided on the side of the bag chamber, and the smoke box is used to input smoke with a set flow direction into the bag chamber;

[0008] A spark arrestor and a filter, wherein the spark arrestor includes a plurality of baffle assemblies provided with baffles for intercepting sparks in flue gas, and the filter includes a plurality of filter bags for filtering flue gas, wherein the baffle assemblies and the plurality of filter bags are arranged sequentially inside the bag chamber along the flow direction of the flue gas.

[0009] An ash hopper, disposed at the bottom of the bag chamber, is used to collect settled soot; and

[0010] An outlet flue is provided on the top side of the bag chamber and is located for discharging filtered flue gas.

[0011] In the aforementioned baghouse dust collector with spark capture function, multiple baffle assemblies are arranged in parallel along the flow direction of flue gas inside the baghouse, and the outer peripheral wall of each baffle assembly extends toward the inner peripheral wall of the baghouse, thereby sealingly connecting with the inner peripheral wall of the baghouse.

[0012] In the aforementioned baghouse dust collector with spark capture function, each of the baffle assemblies has an interception hole on its plate surface, and the front opening area of ​​each interception hole on the front and rear plates of the baffle assembly is larger than the opening area of ​​the rear opening.

[0013] In the aforementioned baghouse dust collector with spark capture function, the interception holes at corresponding positions on any two adjacent baffle assemblies are staggered.

[0014] The aforementioned baghouse dust collector with spark capture function includes a clean air chamber at the top of the baghouse, which is connected to multiple filter bags and the outlet flue.

[0015] The aforementioned baghouse dust collector with spark capture function further includes a blocking structure disposed inside the ash hopper and below multiple baffle assemblies. The blocking structure includes an upper fixed plate, a lower rotating plate, and a blocking spring. The top end of the upper fixed plate is fixedly disposed on the lower plate surface of the bag chamber corresponding to the top of the rearmost baffle assembly. The top end of the lower rotating plate is rotatably connected to the bottom end of the upper fixed plate. The two ends of the blocking spring are respectively connected to the inner wall of the ash hopper and the plate surface of the lower rotating plate, thereby causing the bottom end of the rotating plate to contact the inner wall of the ash hopper where the blocking spring is disposed.

[0016] The aforementioned baghouse dust collector with spark capture function also includes a rapping cleaning device and a pulse cleaning device to clean the baffle assembly and filter bags respectively.

[0017] In the aforementioned baghouse dust collector with spark capture function, the smoke box is a square trumpet-shaped structure with a large front opening area and a small rear opening area.

[0018] The aforementioned baghouse dust collector with spark capture function also includes a lift valve installed inside the clean air chamber.

[0019] The aforementioned baghouse dust collector with spark capture function includes a guide plate inside the bag chamber for guiding the flue gas to flow in a set direction, and the guide plate is also provided with multiple diversion holes.

[0020] The beneficial effects are as follows: This application organically combines the spark arrestor and the bag filter into a single, compact structure. When purifying high-temperature, spark-containing flue gas, it eliminates sparks in the flue gas to prevent burnt-out of the filter bags, thus protecting them. Simultaneously, it removes large dust particles from the flue gas, acting as a pre-dust collector, reducing the amount of dust entering the filter bags, improving dust removal efficiency, extending the cleaning cycle, and saving operating costs. It is particularly suitable for purifying high-temperature, spark-containing flue gas, offering low investment, reliable operation, and ease of implementation. Attached Figure Description

[0021] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0022] Figure 1 This is a front view of a bag filter with spark capture function according to the present invention;

[0023] Figure 2 This is a side view of a bag filter with spark capture function according to the present invention, wherein the number of bag chambers is two;

[0024] Figure 3 This is a top view of a bag filter with spark capture function according to the present invention;

[0025] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0026] Figure 5 for Figure 3 Enlarged view of point B in the middle.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Bag chamber; 2. Smoke box; 3. Baffle assembly; 31. Arc plate; 4. Filter bag; 5. Ash hopper; 6. Outlet flue; 7. Clean air chamber; 81. Upper fixed plate; 82. Lower rotating plate; 83. Blocking spring; 91. Vibrating cleaning device; 92. Pulse cleaning device; 93. Lifting valve; 10. Guide plate. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0031] refer to Figures 1 to 5 As shown, the dust collector with spark capture function of the bag chamber 1 of this application includes: two bag chambers 1 arranged side by side, a smoke box 2 is arranged on the left side of the left bag chamber 1, and outlet flues 6 are arranged on both sides of the bag chamber 1. The flue gas enters the left bag chamber 1 through the smoke box 2. First, the sparks and large dust particles carried by the flue gas are filtered out by two baffle assemblies 3 arranged side by side inside the left bag chamber 1. Then the flue gas flows into the filter bags 4 inside the bag chamber 1 in sequence. The filtered flue gas is collected in the clean air chamber 7 and discharged through the outlet flue 6. The filtered dust is left in the two ash hoppers 5 arranged at the bottom of the left and right bag chambers 1.

[0032] As another implementation method, the number of baffle assemblies can be increased according to different filtration requirements, such as three or four sets, with multiple sets of baffle assemblies arranged side by side and at equal intervals, thereby increasing the overall filtration effect of the device.

[0033] Furthermore, the smoke box 2 has a square horn structure. As the flue gas enters, the cross-section of the flue gas flow gradually increases, and the flue gas velocity gradually decreases, which is conducive to the settling of dust. The bottom plate of the smoke box 2 is connected to the upper edge of the ash hopper 5, and the angle between it and the horizontal plane is greater than the angle of repose of the dust, which facilitates the flow of dust settling in the smoke box 2 into the ash hopper 5.

[0034] Furthermore, the outer peripheral walls of the two baffle assemblies 3 are respectively sealed and inserted into the inner side wall of the bag chamber 1. Each baffle assembly 3 includes multiple arc-shaped plates 31. The arc-shaped plates 31 of the front and rear baffle assemblies 3 are arranged alternately, that is, the center of the arc-shaped plate 31 of the rear baffle assembly is directly opposite the center of the interval between the two arc-shaped plates 31 of the front baffle assembly 3, thereby playing the role of comprehensively filtering the internal sparks of the flue gas.

[0035] Meanwhile, the left ash hopper 5 is equipped with a barrier structure, consisting of a fixed plate 81, a lower rotating plate 82, and a blocking spring 83. The bottom of the lower rotating plate 82 remains in contact with the inner wall of the left ash hopper 5 under the tension of the blocking spring 83, thus preventing flue gas from bypassing the spark arrestor and flowing into the filter bag 4 area through the ash hopper 5. When a large amount of dust accumulates above the lower rotating plate 82, i.e., when the pressure of the dust on the lower rotating plate 82 exceeds the tension of the blocking spring 83, the lower rotating plate 82 automatically opens, allowing the accumulated dust to fall into the ash hopper 5. At this point, the lower rotating plate 82 automatically returns to contact with the inner wall of the left ash hopper 5 under the tension of the blocking spring 83. This cycle repeats, preventing flue gas short-circuiting and automatically discharging dust.

[0036] Furthermore, the flue gas passing through the spark arrester is guided by the guide plate 10 and then enters the filter bag 4 for filtration, thereby effectively distributing the airflow into the filter bag 4 and preventing the airflow from scouring the filter bag 4. The flue gas treated by the filter bag 4 flows into the clean air chamber 7 and is discharged through the outlet flue 6. A dust removal device is installed in the clean air chamber. When the resistance of the filter bag 4 reaches the design value, the dust removal is activated, at which point the dust is peeled off from the filter bag 4 and falls into the ash hopper 5. The resistance of the filter bag 4 decreases, and the dust removal stops when the resistance drops to the design value. The clean air chamber consists of two or more independent housings. By closing the lifting valve 93, offline dust removal and maintenance of the dust collector can be achieved. The guide plate 10 effectively distributes the airflow into the filter bag 4, preventing the airflow from scouring the filter bag 4.

[0037] Preferably, the rapping cleaning device 91 and the pulse cleaning device 92 can be mechanical or electromagnetic, respectively, to achieve cleaning of the baffle assembly 3 and the filter bag 4.

[0038] Based on the above description in this specification, those skilled in the art will also understand that the following terms, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0039] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A bag filter with spark capture function, characterized in that, include: A bag chamber, wherein a smoke box is provided on the side of the bag chamber, and the smoke box is used to input smoke with a set flow direction into the bag chamber; A spark trapping device and a filtering device, the spark trapping device comprising: a plurality of baffle assemblies provided for intercepting sparks in flue gas; the filtering device comprising: a plurality of filter bags for filtering flue gas, the plurality of baffle assemblies and the plurality of filter bags being arranged sequentially inside the bag chamber along the flow direction of the flue gas; an ash hopper disposed at the bottom of the bag chamber and used for collecting settled soot; and an outlet flue disposed at the top side of the bag chamber and located for discharging the filtered flue gas. Multiple baffle assemblies are arranged in parallel and staggered along the flow direction of the flue gas inside the bag chamber, and the outer peripheral wall of each baffle assembly extends toward the inner peripheral wall of the bag chamber, thereby sealingly connecting with the inner peripheral wall of the bag chamber. Each of the baffle assemblies includes: a plurality of spaced-apart arc-shaped plates, the opening of each of the arc-shaped plates facing the cigarette box; Each of the baffle assemblies is provided with an interception hole on its plate surface, and the opening area of ​​the front opening of each interception hole on the front and rear plates of the baffle assembly is larger than the opening area of ​​the rear opening. The arc-shaped plates of the front and rear baffle assemblies are arranged alternately, that is, the center of the arc-shaped plate of the rear baffle assembly is directly opposite the center of the interval between the two arc-shaped plates of the front baffle assembly. It also includes a blocking structure disposed inside the ash hopper and located below multiple baffle assemblies. The blocking structure includes an upper fixed plate, a lower rotating plate, and a blocking spring. The top end of the upper fixed plate is fixedly disposed on the lower plate surface of the bag chamber corresponding to the top of the rearmost baffle assembly. The top end of the lower rotating plate is rotatably connected to the bottom end of the upper fixed plate. The two ends of the blocking spring are respectively connected to the inner wall of the ash hopper and the plate surface of the lower rotating plate, so that the bottom end of the rotating plate contacts the inner wall of the ash hopper where the blocking spring is disposed.

2. The bag filter with spark collection function according to claim 1, characterized in that, The interception holes at corresponding positions on any two adjacent baffle assemblies are staggered.

3. The bag filter with spark collection function according to claim 2, characterized in that, The top of the bag chamber is also provided with a clean air chamber, which is connected to multiple filter bags and the outlet flue.

4. The bag filter with spark collection function according to claim 1, characterized in that, It also includes a rapping cleaning device and a pulse cleaning device to clean the baffle assembly and filter bag, respectively.

5. The bag filter with spark collection function according to claim 1, characterized in that, The cigarette box is a square, trumpet-shaped structure with a large opening area at the front and a small opening area at the rear.

6. The bag filter with spark collection function according to claim 3, characterized in that, The clean air chamber is also equipped with a lift valve.

7. The bag filter with spark collection function according to claim 1, characterized in that, The interior of the bag chamber is also equipped with a guide plate for guiding the flue gas to flow in a set direction, and the guide plate is also equipped with multiple diversion holes.

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