Low-resistance and low-leakage bag type dust collector

Abstract

According to the low-resistance and low-leakage bag type dust collector provided by the utility model, the air inlet main flue is directly arranged in the middle box body of the dust collection module unit, and is directly perforated to serve as a branch air inlet to enable flue gas to enter the filter chamber, so that a complicated external flue structure in the traditional design is reduced, the resistance of the flue gas in the transmission process is reduced, and the dust collection efficiency is improved. Meanwhile, the heat loss of the flue is reduced; the top of the flue gas chamber is provided with a mounting hole convenient for the cloth bag assembly to enter and exit, the side wall is provided with a manhole door convenient for entering the inside for maintenance, and other openable structures are not arranged any more, so that the leakage rate is reduced, and low-temperature gas invasion is reduced to the greatest extent. Smoke at the outlet of the cloth bag assembly directly flows into the flue gas chamber and then flows out of the smoke outlet connector, and smoke resistance is reduced. The guide shutter mechanisms are arranged at the branch air inlets, smoke can be guided, smoke resistance can be reduced, smoke speed reduction and particulate matter sedimentation are achieved, and the situation that smoke carries large-particle dust to abrade a cloth bag, sparks burn the bag and the like is prevented.

Description

Technical Field

[0001] The utility model belongs to the field of industrial furnace smoke treatment engineering, and specifically relates to a low-resistance and low-leakage bag dust collector. Background Art

[0002] With the improvement of national environmental protection standards, especially in industries with ultra-low emission requirements such as electricity, steel, cement and coking, traditional electrostatic precipitators can no longer meet the requirements of ultra-low emissions, and bag dust collectors are gradually replacing electrostatic precipitators.

[0003] However, the resistance of traditional bag dust collectors is relatively greater than that of electrostatic dust collectors, resulting in the advantages of operating cost savings are not obvious, which affects the promotion and use of bag dust collectors. At the same time, in some industries, such as sintering and pelletizing, due to the operation under a large negative pressure, the sealing effect of traditional bag dust collectors is relatively poor, especially the large number of maintenance doors reserved on the top for replacing bags, which increases the air leakage rate of the dust removal device. This part of the increased air volume not only affects the operation of the main fan, but also causes the intrusion of low-temperature gas, causing local condensation of flue gas and corrosion of dust collectors, flue, etc.

[0004] Chinese patent CN202682948U discloses a low-resistance and high-efficiency bag dust collector with low-speed air intake on the outer side. Its flue gas inlet is arranged at the front end of the bag dust removal area through the air intake branch flue, and the air intake side channel is arranged on the left and right sides of the bag dust removal area. The dust-containing flue gas enters the air intake side channel from the flue gas inlet through the air intake branch flue. The entire dust collector is air-intaken from the side, which can effectively reduce the air intake speed of the flue gas. However, its external air intake branch flue and air intake side channel are in direct contact with the external environment, which can easily cause the heat loss of the flue gas when passing through the flue, thereby causing a decrease in the flue gas dust removal efficiency. In addition, the top of the upper box body at the top of the bag dust removal area of ​​the patent is sealed by setting an upper cover plate. Although it is convenient for the replacement and maintenance of the bag, it is more likely to have the problem of poor sealing between the cover plate and the upper box body of the dust collector, thereby increasing the air leakage rate. Utility Model Content

[0005] In order to overcome the deficiencies in the prior art, the utility model provides a low-resistance and low-leakage bag dust collector, in which the main air intake flue is placed inside the dust collector, and a hole is directly opened in the main air intake flue as a branch air inlet to enter the filter chamber, thereby reducing the heat loss in the flue and reducing the smoke resistance; the openable structure is reduced, the system sealing is improved, and the leakage rate is reduced.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A low-resistance and low-leakage bag-type dust collector, comprising at least one dust removal module unit, the dust removal module unit comprising an intermediate box body and an air intake main flue fixedly mounted inside the intermediate box body, the air intake main flue is fixedly connected to the flue gas intake interface to allow the flue gas to be dusted; a hole is opened in the lower bottom plate of the air intake main flue as a branch air inlet, and a plurality of bag assemblies are also installed in the intermediate box body, and the plurality of bag assemblies are arranged on both sides of the air intake main flue; the bottom end of the intermediate box body is fixedly connected to an ash hopper, and the top end of the intermediate box body is fixedly connected to two flue air chambers, the two flue air chambers respectively correspond to a bag assembly on one side, and the two flue air chambers are respectively fixedly connected to a flue gas outlet interface; a manhole is respectively provided on the side walls of the two flue air chambers, and a plurality of bag assembly mounting holes are respectively provided on the top plate, and other openable structures are not provided; a manhole door is provided at the manhole, and a hole plug is provided at the bag assembly mounting hole;

[0008] A guide louver mechanism is connected below the branch air inlet to guide the smoke and slow down the settling of particulate matter; there is a spacing space between the bottom outlet of the guide louver mechanism and the lower wall plate of the middle box body for smoke to escape;

[0009] The guide louver mechanism includes a steel column, a guide cylinder, and a louver plate; the steel column is composed of four inclined steel sections, the top of each steel section is fixedly connected to the four corners of the branch air inlet, and the opening size surrounded by the top of the four steel sections is larger than the opening size surrounded by the bottom; the guide cylinder is a conical cylinder structure with a larger top and a smaller bottom composed of four inclined steel plates a, which is welded to the inner side of the upper end of the steel column and has the same inclination as the steel column; the louver plate is composed of a plurality of steel plates b with their bottoms inclined inwardly, and a plurality of spaced steel plates b are fixedly connected between every two steel sections from top to bottom.

[0010] Furthermore, the ash hopper includes a first ash hopper and a second ash hopper respectively corresponding to the bag assembly on one side, and the bottom outlet of the guide louver mechanism is located above the center line between the first ash hopper and the second ash hopper.

[0011] Furthermore, the height of the flue gas chamber is not less than 2.5 m and not less than 1 / 2 of the height of the bags of the bag assembly.

[0012] Furthermore, each flue gas chamber is provided with a pulse cleaning component which is arranged correspondingly above the bag assembly.

[0013] The beneficial effects of the utility model include:

[0014] The main air intake flue is placed directly inside the middle box of the dust removal module unit, and a hole is directly opened as a branch air inlet to allow the flue gas to enter the filter chamber, which reduces the complex external flue structure in the traditional design, thereby reducing the resistance of the flue gas during transmission, improving the overall efficiency of the dust collector, and reducing the heat loss of the flue, maintaining the temperature of the flue gas, which is conducive to improving the dust removal efficiency. The top of the flue air chamber is provided with a mounting hole for the bag assembly to enter and exit, and the side wall is provided with a manhole door for easy access to the interior for maintenance. In addition, no other openable structures are provided, which reduces the leakage rate and improves the sealing of the system. At the same time, the intrusion of low-temperature gases is minimized to the greatest extent, thereby reducing the condensed acid corrosion of the flue. The flue gas at the outlet of the bag assembly directly enters the flue air chamber and flows out from the flue gas outlet interface, reducing the flue gas resistance.

[0015] Secondly, a guide shutter mechanism is set at the branch air inlet to guide the flue gas, reduce the flue gas resistance, and achieve flue gas deceleration and particle sedimentation, preventing the flue gas from carrying large particles of dust to wear the bag and sparks to burn the bag, etc., extending the service life of the bag assembly. The height of the flue gas chamber is not less than 2.5m, and not less than 1 / 2 of the bag height of the bag assembly, ensuring the operating space for changing the bag and entering the flue gas chamber through the manhole door. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of the overall structure of a low-resistance and low-leakage bag-type dust collector of the utility model;

[0017] Figure 2 yes Figure 1 AA section view;

[0018] Figure 3 This is a top view of the overall structure of a low-resistance and low-leakage bag-type dust collector of the utility model;

[0019] Figure 4 is a cross-sectional schematic diagram of a guide louver mechanism;

[0020] Figure 5 yes Figure 4 BB cross-sectional view;

[0021] Figure 6 It is a three-dimensional structural diagram of the guide louver mechanism.

[0022] In the figure: 101-smoke inlet interface, 102a-first smoke outlet interface, 102b-second smoke outlet interface, 3-dust removal module unit, 301-bag assembly, 302-main smoke inlet, 303-branch air inlet, 304a-first flue air chamber, 304b-second flue air chamber, 305a-first ash hopper, 305b-second ash hopper, 306-middle box, 307a-first manhole door, 307b-second manhole door, 4-pulse cleaning assembly, 401-air bag, 402-pulse solenoid valve, 5-guide shutter mechanism, 501-steel column, 502-guide cylinder, 503-louver plate, 5021-steel plate a, 5031-steel plate b. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, "a", "b", "first", "second", etc. are only used to distinguish components, and cannot be understood as indicating or implying relative importance.

[0025] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] The utility model provides a bag-type dust collector with low resistance and low leakage, in which an air intake main flue is placed inside the dust collector, and a hole is directly opened in the air intake main flue as a branch air inlet to connect to a filter chamber, and a guide shutter mechanism is arranged at the branch air inlet of each chamber, so as to reduce the smoke resistance and prevent the large particles of dust and sparks carried by the smoke from wearing out and burning the bags; the outlet flue is combined with the flue air chamber, and a tall structure is adopted, and the outlet smoke of the bag assembly is directly connected to the outlet flue, so as to reduce the smoke resistance, and there is no inspection door (i.e., manhole door) on the top of the flue air chamber, and only a plurality of bag assembly mounting holes for facilitating the entry and exit of the bag assembly are arranged, and the inspection door (i.e., manhole door) is arranged on the side wall of the flue air chamber, and the inspection and replacement of the bags are carried out inside the flue air chamber through the inspection door (i.e., manhole door), thereby reducing the leakage points and reducing the leakage rate. Example 1

[0027] A low-resistance and low-leakage bag dust collector, the overall structure is set up for reference Figure 1-Figure 3 , including: a smoke inlet interface 101, a first smoke outlet interface 102a, a second smoke outlet interface 102b, one or more dust removal module units 3, and a pulse cleaning component 4. This embodiment takes three dust removal module units 3 as an example.

[0028] The dust removal module unit 3 includes: a main air inlet duct 302, a branch air inlet 303, a guide shutter mechanism 5, a first flue air chamber 304a, a second flue air chamber 304b, an intermediate box 306, a first ash hopper 305a, a second ash hopper 305b, and a bag assembly 301.

[0029] The main air intake duct 302 is fixedly installed in the middle and upper part of the middle box 306. The lower bottom plate of the main air intake duct 302 has a hole as a branch air intake 303. A guide louver mechanism 5 is connected below the branch air intake 303. There is a spacing space between the bottom outlet of the guide louver mechanism 5 and the lower wall plate of the middle box 306 for smoke to escape. The first dust removal module unit 3 ( Figure 1 , Figure 3 The main air intake duct 302 of the leftmost unit is welded to the air intake interface 101, and the main air intake ducts 302 of the three dust removal module units 3 are interconnected. The last dust removal module unit 3 ( Figure 1 , Figure 3 The two flue gas chambers (the first flue gas chamber 304a and the second flue gas chamber 304b) on the far right are respectively connected to the first smoke outlet interface 102a and the second smoke outlet interface 102b.

[0030] The guide louver mechanism 5 is composed of a steel column 501, a guide cylinder 502, and a louver plate 503. Specifically:

[0031] The steel column 501 is composed of four inclined steels, the top of each steel is fixedly welded to the four corners of the branch air inlet 303, and the size of the opening surrounded by the top of the four steels is larger than the size of the opening surrounded by the bottom, that is, it presents a cone shape with a larger top and a smaller bottom.

[0032] The guide cylinder 502 is composed of four inclined steel plates a5021, which are connected in sequence to form a cone cylinder with a larger top and a smaller bottom, and is welded to the inner side of the upper end of the steel column 501, and the inclination is consistent with that of the steel column 501;

[0033] The louver plate 503 is composed of a number of steel plates b5031 with the bottom inclined inwards. A number of steel plates b5031 are welded from top to bottom between every two steel sections, that is, a number of steel plates b5031 arranged vertically are welded on the four sides of the conical frame of the steel column 501, and the whole structure is a conical column with louvers on four sides. Figure 6The bottom sides of each steel plate b5031 are welded to the steel section, and the top edge is tilted outward and open.

[0034] Multiple bag assemblies 301 are fixedly installed in the middle box 306. The multiple bag assemblies 301 are divided into two groups and arranged on both sides of the main air intake flue 302. The lower end of the middle box 306 is welded and connected to two ash hoppers (the first ash hopper 305a and the second ash hopper 305b), and the upper end is welded and connected to two flue gas chambers (the first flue gas chamber 304a and the second flue gas chamber 304b). The first flue gas chambers 304a of the three dust removal module units 3 are interconnected, and the second flue gas chambers 304b of the three dust removal module units 3 are interconnected.

[0035] A manhole door (first manhole door 307a, second manhole door 307b) is provided on each of the two flue air chamber side walls of a dust removal module unit 3, and a plurality of bag assembly installation holes are provided on the top of the flue air chamber, and no other openable structure is provided. The height H1 of the flue air chamber is not less than 2.5 meters, and not less than 1 / 2 of the bag height of the bag assembly 301.

[0036] Each flue air chamber is provided with a pulse cleaning assembly 4 correspondingly arranged above the bag assembly 301. The pulse cleaning assembly 4 is a conventional pulse cleaning, mainly including an air bag 401, a pulse solenoid valve 402 and a pulse air duct. The air bag 401 is connected between the compressed air interface and the pulse air duct. The pulse air duct is arranged correspondingly above the bag assembly 301, and a pulse solenoid valve 402 is provided on the pulse air duct. The pulse air duct penetrates the side wall of the flue air chamber, and the penetration is sealed. In the initial state, the air bag 401 has been filled with sufficient compressed air through the compressed air interface and maintains a certain pressure. At this time, the pulse solenoid valve 402 is in a closed state, preventing the compressed air in the air bag 401 from entering the pulse air duct. When the bags of the bag assembly 301 are gradually clogged due to capturing particulate matter in the flue gas and need to be cleaned, the pulse solenoid valve 402 is opened to open the passage between the air bag 401 and the pulse air duct. The compressed air in the air bag 401 enters the pulse air duct through the opened pulse solenoid valve 402. The compressed air in the pulse air duct is ejected in the form of high-speed, short pulses, acting on the bags of the bag assembly 301. The high-speed impact of the pulse air causes the particles on the bags to be strongly disturbed and peeled off. The particles fall off the surface of the bags due to inertia and fall into the ash hopper below. After pulse cleaning is completed, the pulse solenoid valve 402 is closed, cutting off the passage between the air bag 401 and the pulse air duct. The pulse cleaning assembly 4 returns to its initial state and waits for the next cleaning cycle.

[0037] Based on the above structural settings, the overall working process of this application is as follows:

[0038] The flue gas to be treated enters the main air intake duct 302 of the dust collector through the flue gas inlet interface 101. The bottom plate of the main air intake duct 302 is provided with a hole as a branch air intake 303. After the flue gas enters the branch air intake 303, it enters the guide louver mechanism 5. The particles with sparks that may exist in the flue gas are guided downward by the guide cylinder 502. The flue gas on both sides collides with the louver plate 503. The particles in the flue gas are decelerated and settled. The gas can escape from the gap between the bottom outlet of the guide louver mechanism 5 and the lower wall plate of the intermediate box 306 along the louver plate 503. Most of the gas going downward collides with the ash hopper (the first ash hopper 305a and the second ash hopper 305b), and the particles are left behind. The gas turns back and moves upward, entering the intermediate box 306 on both sides, and then the particles are removed after being filtered by the bag assembly 301. The purified gas enters the first flue air chamber 304a and the second flue air chamber 304b respectively. Only the bag assembly installation hole is set on the upper part of the flue air chamber, and each flue air chamber is provided with a manhole door (the first manhole door 307a and the second manhole door 307b) to reduce leakage points. Operations such as replacing the bag are performed through the manhole door to enter the first flue air chamber 304a and the second flue air chamber 304b respectively. In order to ensure the operating space, the height of the flue air chamber is not less than 2.5 meters and not less than 1 / 2 of the height of the bag. The bag cleaning operation adopts the pulse cleaning component 4, and the cleaned ash is finally collected by the ash hopper and discharged. Example 2

[0039] This embodiment mainly provides the specific structural parameter settings of the steel column 501, the guide cylinder 502, and the louver plate 503:

[0040] refer to Figure 4 The steel section constituting the steel section column 501 has an inclination angle a1 of 75° to 85° with the horizontal plane; the steel section may be an angle steel or a hollow square steel, and in this embodiment, an equilateral angle steel is preferred.

[0041] refer to Figure 4 , the height H2 of the guide cylinder 502 is ≥300mm.

[0042] The multiple inclined steel plates b5031 constituting the louver plate 503 have an inclination angle a2 of 60°~70° with the horizontal plane.

[0043] In summary, this application has the following advantages:

[0044] (1) Reduces the resistance of flue gas and prevents flue gas from carrying large particles of dust, which may cause wear on bags and sparks on bags;

[0045] (2) The built-in flue reduces the heat loss of the flue;

[0046] (3) Reduces acid condensation corrosion in the flue caused by low-temperature gases;

[0047] (4) The number of openable structures is reduced, the system sealing is improved, and the leakage rate is reduced.

[0048] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A low-resistance and low-leakage bag filter, characterized in that: The dust removal module unit (3) comprises at least one dust removal module unit (3), the dust removal module unit (3) comprising an intermediate box (306) and an air intake main flue (302) fixedly mounted inside the intermediate box (306), the air intake main flue (302) being fixedly connected to a flue gas intake interface (101) to allow flue gas to be dust removed to enter; a hole is opened on the bottom plate of the air intake main flue (302) as a branch air intake port (303), a plurality of bag assemblies (301) are further mounted inside the intermediate box (306), and the plurality of bag assemblies (301) are separately mounted On both sides of the main air inlet flue (302); the bottom end of the middle box (306) is fixedly connected to the ash hopper, and the top end of the middle box (306) is fixedly connected to two flue gas chambers, the two flue gas chambers each correspond to a bag assembly (301) on one side, and the two flue gas chambers are each fixedly connected to a flue gas outlet interface; a manhole is respectively provided on the side walls of the two flue gas chambers, and a plurality of bag assembly mounting holes are respectively provided on the top plate, and other openable structures are not provided; a manhole door is provided at the manhole, and a hole plug is provided at the bag assembly mounting hole; A guide louver mechanism (5) is connected below the branch air inlet (303) to guide the smoke and slow down the settling of particulate matter; a spacing space is provided between the bottom outlet of the guide louver mechanism (5) and the lower wall plate of the intermediate box (306) to allow smoke to escape; The guide louver mechanism (5) comprises a steel column (501), a guide cylinder (502), and a louver plate (503); wherein the steel column (501) is composed of four inclined steels, the top of each steel being fixedly connected to the four corners of the branch air inlet (303), and the size of the opening surrounded by the tops of the four steels is larger than the size of the opening surrounded by the bottoms thereof; the guide cylinder (502) is a conical cylinder structure with a larger top and a smaller bottom, composed of four inclined steel plates a (5021), which is welded to the inner side of the upper end of the steel column (501) and has the same inclination as the steel column (501); the louver plate (503) is composed of a plurality of steel plates b (5031) with their bottoms inclined inwardly, and a plurality of spaced steel plates b (5031) are fixedly connected between every two steels from top to bottom.

2. A low-resistance and low-leakage bag filter according to claim 1, characterized in that: The ash hopper comprises a first ash hopper (305a) and a second ash hopper (305b) respectively corresponding to the bag assembly (301) on one side, and the bottom outlet of the guide shutter mechanism (5) is located above the center line between the first ash hopper (305a) and the second ash hopper (305b).

3. A low-resistance and low-leakage bag filter according to claim 2, characterized in that: The height of the flue gas chamber is not less than 2.5 m and not less than 1 / 2 of the height of the bag of the bag assembly (301).

4. A low-resistance and low-leakage bag filter according to any one of claims 1 to 3, characterized in that: Each flue gas chamber is provided with a pulse cleaning assembly (4) arranged correspondingly above the bag assembly (301).

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