An online cleaning flue gas precipitator

Abstract

The present application relates to the technical field of dust collector, and particularly discloses a flue gas dust collector capable of being cleaned on line, which comprises a box body and a collecting hopper connected in an up-down mode, a perforated partition plate is arranged in the box body, a plurality of filter elements are arranged on the perforated partition plate in a rectangular array mode, a blowback filter mechanism and a filter element sleeve isolation mechanism which are synchronously movable and vertically aligned are arranged in the box body above and below the perforated partition plate, the blowback filter mechanism comprises a blowback air pipe, a compressed air source is connected to the end of the blowback air pipe, and a high-pressure air nozzle vertically aligned with a row of filter elements is arranged at the lower end of the blowback air pipe; when the filter elements in the flue gas dust collector need to be cleaned, the filter elements are sleeved into the telescopic sleeve to be separated from the inner cavity of the box body, then the blowback filter mechanism is started to blow back and clean the row of filter elements by passing high-pressure airflow into the row of filter elements, so that the blowback and cleaning process does not affect the normal operation of other filter elements in the box body, and the flue gas dust collector is cleaned on line.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of dust collectors, and discloses a flue gas dust collector capable of being cleaned online. BACKGROUND

[0002] Dust removal and purification of industrial flue gas is a necessary treatment means before emission, and existing flue gas dust removal and purification methods include cyclone dust removal, electrostatic dust removal, bag-type dust removal and spray dust removal, among which the bag-type dust collector is a widely used industrial flue gas purification treatment device.

[0003] For example, the patent application No. 2021112811661 discloses a blast furnace flue gas cloth bag dust collection device convenient to collect, which comprises a shell, a collection mechanism is arranged at the bottom end of the shell, a control mechanism is arranged in the shell, the control mechanism drives the collection mechanism, a crushing mechanism is arranged on the shell, a cleaning mechanism is arranged on the control mechanism, an auxiliary mechanism is arranged between the crushing mechanism and the cleaning mechanism, the cleaning mechanism comprises a high-pressure bag, a plurality of universal rings are arranged in a matrix on a first fixed plate, the universal rings and the first fixed plate are movably connected, a filter core is arranged on the universal ring, and the filter core is composed of a dust removal cloth bag and a filter cylinder framework. The blast furnace flue gas cloth bag dust collection device disclosed by the patent application is a common bag-type dust collector on the market, which uses the filter core to filter and retain the incoming flue gas to achieve the effect of purifying the flue gas, and when the dust attached to the surface of the filter core is serious and the filtration and purification resistance increases, the filter core is cleaned by the backflow gas flow sprayed from the high-pressure bag, so that the filter core can maintain good filtration effect for a long time. However, the blast furnace flue gas cloth bag dust collection device cannot clean the filter core online, because the backflow gas flow sprayed from the high-pressure bag will break the flue gas flow state in the shell, and more dust will be stirred and attached, so that the flue gas needs to be stopped from being introduced into the shell during the cleaning process of the filter core, and the industrial boiler and other flue gas sources cannot be stopped, so that multiple bag-type dust collectors need to be provided to ensure the normal operation of the boiler and the like. Based on this, the application provides a flue gas dust collector capable of being cleaned online without affecting the flue gas filtration process. SUMMARY

[0004] The application aims to provide a flue gas dust collector capable of being cleaned online to solve the problem that the existing blast furnace flue gas cloth bag dust collection device cannot clean the filter core online.

[0005] The application is achieved by the following technical scheme:

[0006] The application discloses an online cleaning flue gas dust remover, which comprises a box body and a collecting hopper which are connected in series, a perforated partition plate is arranged in the box body, a plurality of filter elements are arranged on the perforated partition plate in a rectangular array, an air inlet is arranged on the box body below the perforated partition plate, an air outlet is arranged on the box body above the perforated partition plate, a back-blowing filter mechanism and a filter element set isolation mechanism which move synchronously and are vertically aligned are arranged in the box body below and above the perforated partition plate, the back-blowing filter mechanism comprises a back-blowing air pipe, the end of the back-blowing air pipe is connected with a compressed air source, and a high-pressure gas nozzle which is vertically aligned with a row of filter elements is arranged at the lower end of the back-blowing air pipe.

[0007] The filter element set isolation mechanism comprises a moving frame which is connected with the back-blowing air pipe at the upper end, a conical hopper which is vertically aligned with a row of filter elements is arranged at the lower end of the moving frame, the upper end of the conical hopper is connected with an elastic sleeve pipe, a lifting baffle plate is arranged in the moving frame, a row of pipe end rings which are connected with the elastic sleeve pipe are arranged on the lifting baffle plate, a first driving assembly for driving the moving frame to move back and forth is arranged in the box body, and a second driving assembly for driving the lifting baffle plate to move up and down is arranged in the moving frame.

[0008] During normal dust removal and purification of industrial flue gas, the industrial flue gas is introduced into the box body through the air inlet, the introduced industrial flue gas is forced to pass through the filter elements for dust removal and purification through the negative pressure suction system connected to the air outlet, the dust filtered and retained falls into the collecting hopper for collective discharge, and part of the dust in the industrial flue gas adheres to the outer surface of the filter elements or is agglomerated on the outer surface of the filter elements due to steam liquefaction.

[0009] When the filter effect is found to be reduced and the dust removal and purification resistance is found to be increased after the flue gas dust remover is operated for a long time, it indicates that the dust adhered to the outer surface of the filter elements or the agglomerated material is serious, at this time, the back-blowing cleaning program is started to enable the back-blowing filter mechanism and the filter element set isolation mechanism to operate. First, the moving frame is moved to be vertically aligned with a row of filter elements to be cleaned under the action of the first driving assembly, then the lifting baffle plate is lifted upward under the action of the second driving assembly, the elastic sleeve pipe is elongated upward in the process that the lifting baffle plate moves upward, and the filter elements are sleeved in the elastic sleeve pipe and separated from the inner cavity of the box body, then the back-blowing filter mechanism is started to enable the high-pressure gas to be sprayed from a row of high-pressure gas nozzles and directly into the filter elements which are externally sleeved with the elastic sleeve pipe, under the scouring action of the high-pressure gas flow, the dust adhered to the outer surface of the filter elements or the agglomerated material is washed off, and the cleaned dust or agglomerated material is finally discharged from the conical hopper, the whole back-blowing process does not affect the operation of other filter elements in the box body, and the online back-blowing cleaning of the filter elements is realized.

[0010] As a specific arrangement of the above-mentioned scheme, the first driving assembly comprises a horizontal screw rod arranged in the box body, one end of the horizontal screw rod is connected with a first screw rod motor, and the moving frame is provided with a first screw hole block connected with the horizontal screw rod.

[0011] As a specific arrangement of the above-mentioned scheme, the second driving assembly comprises a vertical screw rod arranged in the moving frame, one end of the vertical screw rod is connected with a second screw rod motor, the lifting strip plate is provided with a second screw hole block connected with the vertical screw rod, and the moving frame is provided with a vertical sliding rod parallel to the vertical screw rod, and the lifting strip plate is provided with a sliding hole matched with the vertical sliding rod.

[0012] As a further arrangement of the above-mentioned scheme, a strip-shaped slit for passing through the side end of the moving frame is formed at one side end of the perforated partition plate, the back-blowing air pipe is connected with the end part of the moving frame extending out of the strip-shaped slit through a connecting block, and the moving frame is provided with an elastic diaphragm for sealing the strip-shaped slit.

[0013] As a further arrangement of the above-mentioned scheme, the compressed air source is fixedly arranged at the upper end of the outer side of the box body, a gas conveying pipe is connected with the compressed air source, a telescopic connecting pipe is connected between the gas conveying pipe and the back-blowing air pipe, and an electromagnetic valve is arranged at the connection between the gas conveying pipe and the telescopic connecting pipe.

[0014] As a further arrangement of the above-mentioned scheme, the front and rear ends of the lifting strip plate are connected with scrapers through guide columns and springs, and the side ends of the two scrapers close to each other are provided with a row of semicircular scraping grooves matched with the outer circular surface of the filter element.

[0015] As a further arrangement of the above-mentioned scheme, the two lifting strip plates are provided with electromagnets that interact with each other, and the two electromagnets generate magnetic field forces that attract each other after being electrified.

[0016] The present application further comprises two front and rear scrapers arranged on the lifting strip plate, and the two scrapers are away from each other during the process that the lifting strip plate moves upwards to wrap the telescopic sleeve pipe on the filter element, so that the two scrapers do not contact the outer surface of the filter element. After the back-blowing filter mechanism finishes back-blowing and cleaning the filter element, current is input into the two electromagnets to make the two electromagnets generate magnetic forces that attract each other, and then the two scrapers are close to each other by overcoming the force of the springs, so that the row of semicircular scraping grooves on the scrapers are attached to the outer surface of the filter element. Then, during the process that the lifting strip plate moves downwards to reset, the semicircular scraping grooves scrape off the blockage on the outer surface of the filter element that is not washed down, so as to effectively clean the outer surface of the filter element.

[0017] As a specific arrangement of the above-mentioned scheme, the filter element is one of a cloth bag filter core, a ceramic filter core or a metal sintered filter core. The specific filter element selects a filter core, which is determined by the flue gas to be filtered, as long as the overall structure of the filter element is in a cylindrical shape.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] When the internal filter elements of the flue gas dust collector disclosed in this invention need to be cleaned, the back-blowing filter mechanism and the filter element set isolation mechanism are moved synchronously to be aligned with the vertical alignment of the row of filter elements. Then, the filter element set isolation mechanism is activated to put the filter elements into the telescopic sleeve to separate them from the inner cavity of the housing. Then, the back-blowing filter mechanism is activated to introduce high-pressure airflow into the row of filter elements for back-blowing cleaning. The isolation effect of the telescopic sleeve ensures that the entire back-blowing cleaning process will not affect the normal operation of other filter elements in the housing, thus realizing online cleaning of the flue gas dust collector.

[0020] The present invention further includes two scrapers on the lifting plate, and a row of semi-circular scraping holes matching the outer surface of the filter element on the scrapers. When the scouring effect of the high-pressure airflow fails to completely remove the dust or clumps adhering to the outer surface of the filter element, the two scrapers move synchronously toward the outer surface of the filter element and fit against it through the attraction of the electromagnet during the subsequent downward movement and resetting of the lifting plate. Then, during the subsequent downward movement of the lifting plate, the impurities on the outer surface of the filter element can be forcibly scraped off through the semi-circular scraping holes, thereby achieving effective cleaning of the outer surface of the filter element and ensuring the filtration effect of the filter element after cleaning. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention from a first angle;

[0023] Figure 2 This is a schematic diagram of the second-angle three-dimensional structure of the present invention;

[0024] Figure 3 This is a three-dimensional structural diagram of the interior of the box and the hopper in this invention from a first angle;

[0025] Figure 4 This is a schematic diagram of the second-angle three-dimensional structure of the box and the hopper in this invention;

[0026] Figure 5 This is a three-dimensional structural diagram of the filter assembly isolation mechanism in this invention;

[0027] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A;

[0028] Figure 7 It is a perspective structure schematic view of the filter element set isolation mechanism in the embodiment 2 of the present application.

[0029] Figure 8 It is a perspective assembly structure schematic view of the filter element set isolation mechanism in the embodiment 2 of the present application. DETAILED DESCRIPTION

[0030] In order to make the person skilled in the art better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0031] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments. Figures 1-8 The present application will be described in detail below with reference to the drawings and in combination with the embodiments. Embodiment 1

[0032] Embodiment 1 discloses an online cleaning flue gas dust remover, referring to the drawings, Figures 1-4 The main body includes a box body 1 and a collecting hopper 2. The upper end of the box body 1 is sealingly arranged, and the lower end is open and connected with the collecting hopper 2. Then, an air inlet 101 is arranged on the upper end of one side surface of the box body 1, and an air outlet 102 is arranged on the upper end of the one side surface of the box body 1. A perforated partition plate 3 is arranged in the box body 1 between the air inlet 101 and the air outlet 102, so as to divide the upper end and the lower end of the box body 1 by the perforated partition plate 3. A plurality of rows of mounting holes are arranged in a rectangular array on the perforated partition plate 3. A filter element 4 extending to the lower side of the box body 1 is arranged in each mounting hole. The specific filter element 4 can be one of a cloth bag filter element, a ceramic filter element or a metal sintered filter element. The type of the specific filter element 4 is determined by the flue gas to be filtered.

[0033] Referring to the drawings, Figures 3-6 A movable blowback filter mechanism 5 is arranged in the box body 1 above the perforated partition plate 3. A filter element set isolation mechanism 6 is arranged in the box body 1 below the perforated partition plate 3 and moves synchronously with the blowback filter mechanism 5. Before the blowback filter mechanism 5 is cleaned by using high-pressure airflow, the filter element set isolation mechanism 6 isolates the filter element 4 to be cleaned by blowback. This avoids the flue gas airflow at the lower end of the box body 1 to be disturbed during the blowback cleaning process, so as to affect the normal flue gas filtering and purification process.

[0034] The filter set isolation mechanism 6 specifically comprises a U-shaped moving frame 601, the two ends of which are attached to the inner walls of the two sides of the box 1. A first threaded hole block 602 is arranged at one side of the lower end of the moving frame 601, then a horizontal lead screw 603 matched with the first threaded hole block 602 is rotatably connected to the lower end of the box 1, and the end of the horizontal lead screw 603 is connected with a first lead screw motor 604 mounted on the outer side surface of the box 1. A vertical lead screw 605 and a vertical sliding rod 606 are respectively arranged at the left and right ends of the moving frame 601, and a second lead screw motor 607 mounted on the lower surface of the moving frame 601 is connected to the lower end of the vertical lead screw 605.

[0035] A row of conical hoppers 608 is fixedly arranged at the lower end of the moving frame 601, and each conical hopper 608 is arranged in alignment with a row of filter pieces 4 on the partition plate 3. An elastic sleeve 609 is connected to the upper end of each conical hopper 608, a lifting batten 610 is arranged above the row of elastic sleeves 609, and a row of pipe end rings 611 connected to the upper ends of the elastic sleeves 609 is arranged on the lifting batten 610. A sliding hole matched with the vertical sliding rod 606 is formed at one end of the lifting batten 610, and a second threaded hole block 612 matched with the vertical lead screw 605 is arranged at the other end of the lifting batten 610, so that under the power input of the second lead screw motor 607 and the transmission of the second threaded hole block 612 and the vertical lead screw 605, the lifting batten 610 can move upwards along the direction of the vertical sliding rod 606, thereby lifting the row of elastic sleeves 609 upwards and completely sleeving the row of filter pieces 4 outside, so as to isolate the filter pieces 4 from the inside of the box 1. In addition, in order to avoid the influence of dust in the flue gas on the lead screw transmission process, a telescopic protective sleeve (not shown in the figure) can also be sleeved on the outer periphery of the horizontal lead screw 603 and the vertical lead screw 605, so as to isolate the part of the lead screw transmission from the inside of the box 1.

[0036] The backflushing filter mechanism 5 comprises a backflushing air pipe 501 parallelly arranged above the filter set isolation mechanism 6, and a row of high-pressure air nozzles 502 arranged in alignment with the elastic sleeves 609 at the lower end of the backflushing air pipe 501. A compressed gas source 503 is fixedly arranged at the upper end of the outer side surface of the box 1, which in this embodiment is a compressed gas cylinder storing high-pressure air. A gas conveying pipe 504 is connected to the compressed gas source 503, then a telescopic connecting pipe 505 is connected between the end of the gas conveying pipe 504 and the end of the backflushing air pipe 501, and an electromagnetic valve 506 is arranged at the connection between the gas conveying pipe 504 and the telescopic connecting pipe 505.

[0037] In order to keep the back-blowing pipe 501 moving synchronously with the moving frame 601 and keep the two in alignment, a strip-shaped slit 301 is formed on one side end of the perforated partition 3, and then the upper end of one side of the moving frame 601 is extended to the upper end of the box body 1 through the strip-shaped slit 301, and then the back-blowing pipe 501 is fixedly connected to the moving frame 601 through the connecting block 507. In addition, in order to avoid the flue gas entering the inner cavity of the box body 1 through the strip-shaped slit 301, an elastic diaphragm 613 capable of sealing the strip-shaped slit 301 is arranged on the moving frame 601, so that the elastic diaphragm 613 can be located in the strip-shaped slit 301, and the elastic diaphragm 613 on both sides can be stretched or shortened during the movement of the moving frame 601, and the strip-shaped slit 301 is completely sealed.

[0038] When the filter piece 4 needs to be cleaned online, the first lead screw motor 604 is started to move the back-blowing filter mechanism 5 and the filter piece sleeve isolation mechanism 6 synchronously to the upper and lower sides of the filter piece 4, and then the second lead screw motor 607 is started to move the lifting baffle plate 610 upward along the vertical sliding rod 606. During the movement of the lifting baffle plate 610, the telescopic sleeve 609 is stretched and lengthened upward, and the filter piece 4 to be cleaned is completely sleeved by the telescopic sleeve 609 and the pipe end ring 611 and is isolated from the inner cavity of the box body 1. Subsequently, the electromagnetic valve 506 is opened to make the high-pressure gas in the compressed gas source 503 sprayed from a row of high-pressure gas nozzles 502. The sprayed high-pressure gas enters the inner cavity of the filter piece 4, thereby washing away the dust attached to the outer surface of the filter piece 4. The washed dust falls from the lower end of the conical hopper 608. The whole back-blowing cleaning process does not affect the filtering process of other filter pieces 4, and online cleaning during the flue gas dust removal process is realized. Embodiment 2

[0039] Embodiment 2 discloses a flue gas dust remover which is optimized and improved based on the technical scheme in embodiment 1. The same parts as those in embodiment 1 will not be described again.

[0040] Reference is made to the accompanying drawings Figure 7 and the accompanying drawings Figure 8 In embodiment 2, a group of guide columns 614 and springs 615 are arranged at the front and rear ends of the lifting baffle plate 610, and scraper plates 616 connected with the corresponding guide columns 614 and springs 615 are arranged on the front and rear sides of the lifting baffle plate 610, so that the two scraper plates 616 are arranged away from the middle line of the lifting baffle plate 610 under the support of the springs 615. A row of semicircular scraping openings 617 matched with the outer circular surface of the filter piece 4 is formed on the side end of the upper end of the two scraper plates 616 close to each other, and each semicircular scraping opening 617 is arranged in alignment with a row of filter pieces 4.

[0041] In addition, the electromagnet 618 is arranged on the two scrapers 616, and the two electromagnets 618 generate mutual attractive magnetic field force after current is input, and the two scrapers 616 can be close to each other and the semicircular scraping edges 617 are attached to the outer surface of the filter element 4 through the magnetic force. When the reverse blowing and filtering cleaning action is finished, the semicircular scraping edges 617 on the front and rear scrapers 616 can forcibly scrape the blockages or dust impurities on the outer surface of the filter element 4 which are not washed down, so that the cleaning effect of the outer surface of the filter element 4 is ensured.

[0042] The above is only the preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An online cleaning flue gas dust remover comprising a box body and a collecting hopper arranged in series, a perforated partition plate is arranged inside the box body, a plurality of filter elements are arranged in a rectangular array on the perforated partition plate, an air inlet is arranged on the box body below the perforated partition plate, and an air outlet is arranged on the box body above the perforated partition plate, characterized in that, The box above and below the perforated partition is provided with a reverse blowing filter mechanism and a filter element set isolation mechanism which move synchronously and are aligned vertically, the reverse blowing filter mechanism comprises a reverse blowing air pipe, the end of the reverse blowing air pipe is connected with a compressed air source, the lower end of the reverse blowing air pipe is provided with a high-pressure air nozzle which is aligned vertically with a row of filter elements; the filter element set isolation mechanism comprises a moving frame which is connected with the reverse blowing air pipe at the upper end, the lower end of the moving frame is provided with a conical hopper which is aligned vertically with a row of filter elements, the upper end of the conical hopper is connected with an extension sleeve, the moving frame is provided with a lifting strip plate, the lifting strip plate is provided with a row of pipe end rings which are connected with the extension sleeve, the box is provided with a first driving assembly for driving the moving frame to move forward and backward, the moving frame is provided with a second driving assembly for driving the lifting strip plate to move vertically; The perforated partition is provided with a strip-shaped slit at one side end for passing the side end of the moving frame, the reverse blowing air pipe is connected with the end of the moving frame which extends out of the strip-shaped slit through a connecting block, the moving frame is provided with an elastic diaphragm for sealing the strip-shaped slit; The front and rear ends of the lifting strip plate are both connected with scrapers through guide columns and springs, the side ends of the two scrapers which are close to each other are both provided with a row of semicircular scraping openings which match the outer circular surface of the filter elements; The two lifting strip plates are both provided with electromagnets which interact with each other, and the two electromagnets generate magnetic field forces which attract each other after being electrified.

2. An online cleaning flue gas precipitator according to claim 1, characterized in that The first driving assembly comprises a horizontal lead screw which is arranged in the box, one end of the horizontal lead screw is connected with a first lead screw motor, the moving frame is provided with a first screw hole block which is connected with the horizontal lead screw.

3. An online cleaning flue gas precipitator according to claim 2, characterized in that The second driving assembly comprises a vertical lead screw which is arranged in the moving frame, one end of the vertical lead screw is connected with a second lead screw motor, the lifting strip plate is provided with a second screw hole block which is connected with the vertical lead screw, the moving frame is provided with a vertical sliding rod which is parallel to the vertical lead screw, the lifting strip plate is provided with a sliding hole which matches the vertical sliding rod.

4. An online cleaning flue gas precipitator according to claim 1, characterized in that, The compressed air source is fixedly arranged at the upper end of the outer side of the box, the compressed air source is connected with a gas delivery pipe, the gas delivery pipe and the reverse blowing air pipe are connected with an extension pipe, the connection between the gas delivery pipe and the extension pipe is provided with a solenoid valve.

5. An in-line cleaned flue gas precipitator according to any one of claims 1-4, characterized in that, The filter element is one of a cloth bag filter element, a ceramic filter element or a metal sintered filter element.

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