Anti-ash-blocking device suitable for flue heat exchanger of thermal power plant

Abstract

The invention belongs to the technical field of heat exchangers, and provides an anti-ash-blocking device suitable for a flue heat exchanger of a thermal power plant, which comprises a shell, two ends of the shell are respectively communicated with an air inlet pipe and an air outlet pipe, a guide cylinder is fixedly mounted in the shell, the opening of the guide cylinder faces the air inlet pipe, and the air outlet end of the guide cylinder is communicated with a separation cylinder; a rotating plate is rotatably mounted in the separating cylinder, two groups of filter cylinders communicated with the separating cylinder are fixedly mounted on the rotating plate, each filter cylinder is provided with an inclined section, a first filter screen is fixedly mounted on the side wall of each inclined section, and a collecting cavity is formed in one end, far away from the rotating plate, of each filter cylinder. Compared with the prior art, the dust removal device has the following beneficial effects that in the operation process, smoke dust impurities on the first filter screen can be scraped off through the scraping plate, automatic cleaning of the first filter screen is achieved, and the cleaned smoke dust impurities can be automatically away from the first filter screen.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of heat exchangers, and particularly relates to a dust blocking prevention device suitable for a flue heat exchanger of a thermal power plant. BACKGROUND

[0002] At present, the actual flue gas temperature inside the power plant is higher than the designed flue gas temperature. With the implementation of the national energy-saving and emission-reducing policy, some power plants install heat exchangers at the tail of the boiler to reduce the temperature of the flue gas, thereby improving the energy utilization rate, improving the air environment quality, and ensuring the safety of power supply.

[0003] The existing flue heat exchanger of the thermal power plant will cause serious dust accumulation inside the heat exchanger due to the reduced flow rate of the flue gas, thereby reducing the effective area of the heat exchanger and the heat exchange effect, and the cross-sectional area of the flue gas flow inside the heat exchanger becomes smaller. When the dust accumulation inside the heat exchanger is serious, the heat exchanger will be blocked. In view of the above technical problems, the Chinese patent with the patent announcement number CN210635097U filters the air entering the heat exchanger in advance by using the first filter screen and the second filter screen. However, the first filter screen and the second filter screen need to be manually taken out and cleaned after a long period of use, which reduces the working efficiency of the equipment. Moreover, as the use time increases, the filtering effect of the first filter screen and the second filter screen will decrease, which affects the heat exchange efficiency of the subsequent heat exchanger. SUMMARY

[0004] The present application aims to provide a dust blocking prevention device suitable for a flue heat exchanger of a thermal power plant, which solves the technical problems of manual cleaning of the filter component and continuous decrease of the filtering effect of the filter component in the prior art.

[0005] The present application is implemented as follows: a dust blocking prevention device suitable for a flue heat exchanger of a thermal power plant, comprising a shell, an air inlet pipe and an air outlet pipe are respectively communicated at both ends of the shell, a guide cylinder is fixedly installed in the shell, the guide cylinder is open towards the air inlet pipe, and a separation cylinder is communicated with the air outlet end of the guide cylinder, a rotating plate is rotatably installed in the separation cylinder, two groups of filter cylinders communicated with the separation cylinder are fixedly installed on the rotating plate, the filter cylinders are provided with inclined sections, first filter screens are fixedly installed on the side walls of the inclined sections, the end of the filter cylinder away from the rotating plate is provided as a collecting cavity, a rotating shaft is rotatably installed in the filter cylinder, the rotating shaft is coaxially arranged with the filter cylinder, scrapers are fixedly installed on the rotating shaft, the scrapers are in sliding contact with the inclined sections of the filter cylinders and used for cleaning the first filter screens, counterweights are fixedly installed on the rotating shaft, and a rotating power element is arranged in the shell to drive the rotating plate to rotate.

[0006] Further technical solutions: the diameter of the inclined section of the filter cylinder gradually increases away from the rotating plate, and the rotating shaft is located in the collecting cavity.

[0007] Further technical solutions: The shell is fixedly installed with a mounting plate, a rotating power element is fixedly installed on the mounting plate and the output end thereof points to the rotating plate, the output end of the rotating power element is fixedly installed with a gear, the gear is engaged with a gear ring fixedly installed on the rotating plate, and the gear ring is coaxially arranged with the rotating plate.

[0008] Further technical solutions: The filter cartridge is fixedly installed with a plurality of groups of supporting plates, a sliding rod is slidingly installed on the supporting plate, the axis of the sliding rod is parallel to the axis of the filter cartridge, one end of the sliding rod is fixedly installed with a conical cover plate for closing the first filter screen close to one end of the inclined section of the filter cartridge, one end of the sliding rod is fixedly installed with an arc-shaped push plate away from the cover plate, the surface of the push plate close to the supporting plate is fixedly installed with an elastic element, and the elastic element is fixedly connected with the supporting plate.

[0009] Further technical solutions: The mounting plate is fixedly installed with an extension element, the output end of the extension element is fixedly installed with a ball, and the projection of the rotating track of the push plate on the mounting plate covers the position where the extension element is located.

[0010] Further technical solutions: The shell is fixedly installed with an air extractor on the outer side, the air extractor is communicated with a first air extraction pipe extending into the shell, the end of the first air extraction pipe is rotatably connected with a connecting cylinder, the connecting cylinder is communicated with two groups of second air extraction pipes, and the ends of the second air extraction pipes away from the connecting cylinder are communicated with the collecting cavities on the corresponding filter cartridges.

[0011] Further technical solutions: The filter cartridge is slidingly installed with a baffle, the baffle is fixedly connected with the cover plate through a connecting plate, and the baffle is used for closing the second air extraction pipe.

[0012] Further technical solutions: The air extractor is communicated with a collecting box at the air outlet end thereof, the collecting box is fixedly installed with a second filter screen therein, the position where the air outlet end of the air extractor is connected with the collecting box is located on the side of the second filter screen away from the shell, the collecting box is communicated with a backflow pipe, the backflow pipe extends into the shell and is located between the guide cylinder and the air inlet pipe, and the collecting box is provided with a box door for cleaning the internal smoke dust.

[0013] Further technical solutions: The separating cylinder is fixedly installed with an arc-shaped closing plate for closing the inlet of the filter cartridge.

[0014] Compared with the prior art, the beneficial effects of the present application are as follows: 1. During the filtration process, the rotating plate drives the two sets of filter cylinders to revolve. Due to the presence of the counterweight, the shaft rotates during the revolving process of the filter cylinders, causing the scraper and the first filter screen to move relative to each other. The scraper can remove the smoke and dust impurities on the first filter screen. Since the first filter screen is located in the inclined section of the filter cylinder, the smoke and dust will automatically move into the collection chamber inside the filter cylinder under the action of gravity. At the same time, the rotation of the filter cylinder itself causes the bottom position of the filter cylinder to change continuously, which in turn causes the smoke and dust impurities to move in the inclined section of the filter cylinder and on the first filter screen, thereby improving the fluidity of the smoke and dust impurities and enabling them to move stably to the collection chamber for collection and storage. The automatic cleaning of the first filter screen is achieved through the combination of the rotation of the filter cylinder and the rotation of the scraper, and the cleaned smoke and dust impurities are automatically moved away from the first filter screen to avoid the accumulation of smoke and dust impurities on the first filter screen and ensure the filtration effect of the first filter screen.

[0015] 2. During cleaning, the cover plate covers the first filter screen and simultaneously releases the seal on the second exhaust pipe. At this time, the exhaust fan operates, drawing out the smoke and dust impurities in the collection chamber through the first and second exhaust pipes and transporting them to the collection box. Meanwhile, the smoke entering the filter cartridge from the separation cylinder will move along the filter cartridge and be drawn out by the exhaust fan, thus forming a stable airflow in the filter cartridge. The flow of the smoke and dust impurities in the filter cartridge moves towards the collection chamber, further cleaning the smoke and dust impurities in the filter cartridge and on the first filter screen, further ensuring the filtration effect of the first filter screen and improving the cleaning effect of the smoke and dust impurities in the filter cartridge.

[0016] 3. When the end of the filter cylinder moves to the position of contact with the sealing plate, the telescopic component retracts. Under the action of the elastic component, the push plate resets and releases the seal on the first filter screen. As the push plate resets, the baffle slowly closes the second exhaust pipe. When the end of the filter cylinder is completely closed by the sealing plate, during the process of closing the second exhaust pipe, the filtered flue gas inside the housing will enter the filter cylinder in reverse through the first filter screen. This clean flue gas will then clean the inside of the filter cylinder again and backflush the first filter screen, further ensuring the filtration effect of the first filter screen and improving the cleaning effect of dust and impurities inside the filter cylinder. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the internal structure of the shell in this invention.

[0019] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0020] Figure 4 This is a schematic diagram of the rotating plate in this invention.

[0021] Figure 5 Structure diagram of filter cartridge in the application.

[0022] Figure 6 Structure diagram of filter cartridge in the application.

[0023] Figure 7 Structure diagram of filter cartridge in the application.

[0024] Figure 8 Structure diagram of filter cartridge in the application. Figure 3 Enlarged diagram of A1 area in the application.

[0025] Figure 9 Structure diagram of filter cartridge in the application. Figure 5 Enlarged diagram of A2 area in the application.

[0026] In the drawings: 1, housing; 2, air inlet pipe; 3, air outlet pipe; 4, guide cylinder; 5, separation cylinder; 6, rotating plate; 7, filter cartridge; 8, first filter screen; 9, collection cavity; 10, rotating shaft; 11, counterweight; 12, scraper; 13, support plate; 14, sliding rod; 15, cover plate; 16, elastic member; 17, push plate; 18, baffle; 19, connecting plate; 20, mounting plate; 21, rotating power member; 22, gear; 23, telescopic member; 24, ball; 25, gear ring; 26, first air suction pipe; 27, connecting cylinder; 28, second air suction pipe; 29, air suction fan; 30, collection box; 31, second filter screen; 32, box door; 33, backflow pipe; 34, closing plate. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the application more clear, the application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application, and are not used to limit the application.

[0028] The specific implementation of the application is described in detail below in combination with specific examples.

[0029] As Figures 1-9As shown, the application provides a suitable anti-coking device for the flue heat exchanger of a thermal power plant, which comprises a shell 1, an air inlet pipe 2 and an air outlet pipe 3 communicated with the two ends of the shell 1 respectively, a guide cylinder 4 fixedly installed in the shell 1, the guide cylinder 4 opening towards the air inlet pipe 2 and an air separation cylinder 5 communicated with the air outlet end of the guide cylinder 4, a rotating plate 6 rotatably installed in the air separation cylinder 5, two groups of filter cylinders 7 fixedly installed on the rotating plate 6 and communicated with the air separation cylinder 5, the filter cylinders 7 being provided with inclined sections and first filter screens 8 fixedly installed on the side walls of the inclined sections, one end of the filter cylinders 7 away from the rotating plate 6 being provided as a collecting cavity 9, a rotating shaft 10 rotatably installed in the filter cylinder 7, the rotating shaft 10 being coaxially arranged with the filter cylinder 7 and a scraper 12 fixedly installed on the rotating shaft 10, the scraper 12 being in sliding contact with the inclined section of the filter cylinder 7 and used for cleaning the first filter screen 8, a counterweight 11 fixedly installed on the rotating shaft 10, the diameter of the inclined section of the filter cylinder 7 gradually increasing away from the rotating plate 6, the rotating shaft 10 being located in the collecting cavity 9, a rotating power element 21 for driving the rotating plate 6 to rotate being arranged in the shell 1, an installation plate 20 fixedly installed in the shell 1, the rotating power element 21 being fixedly installed on the installation plate 20 and the output end thereof pointing to the rotating plate 6, a gear 22 fixedly installed on the output end of the rotating power element 21, the gear 22 being in meshing engagement with a gear ring 25 fixedly installed on the rotating plate 6, and the gear ring 25 being coaxially arranged with the rotating plate 6.

[0030] In actual application, flue gas enters the shell 1 from the air inlet pipe 2 and leaves the shell 1 from the air outlet pipe 3 to enter the heat exchanger, the rotating power element 21 drives the rotating plate 6 to slowly rotate through the meshing gear 22 and the gear ring 25, the flue gas enters the air separation cylinder 5 under the action of the guide cylinder 4 after entering the shell 1, and then enters the filter cylinder 7, the flue gas entering the filter cylinder 7 passes through the first filter screen 8, the first filter screen 8 filters the dust impurities in the flue gas, and the filtered flue gas leaves the shell 1 from the air outlet pipe 3; In the filtering process, the rotating plate 6 drives the two groups of filter cylinders 7 to revolve, due to the existence of the counterweight 11, the rotating shaft 10 rotates in the process of the revolution of the filter cylinder 7, and then the scraper 12 moves relative to the first filter screen 8, the scraper 12 can scrape off the dust impurities on the first filter screen 8, and due to the fact that the first filter screen 8 is located on the inclined section of the filter cylinder 7, the dust moves to the collecting cavity 9 in the filter cylinder 7 under the action of gravity, and at the same time, the revolution of the filter cylinder 7 changes the position of the bottom of the filter cylinder 7, and then the dust impurities move on the inclined section of the filter cylinder 7 and the first filter screen 8, thereby improving the flowability of the dust impurities, and the dust impurities can stably move to the collecting cavity 9 to be collected and stored, the automatic cleaning of the first filter screen 8 is realized through the cooperation of the revolution of the filter cylinder 7 and the rotation of the scraper 12, and the cleaned dust impurities can automatically move away from the first filter screen 8, thereby avoiding the accumulation of dust impurities on the first filter screen 8 and ensuring the filtering effect of the first filter screen 8.

[0031] In one example of the embodiment, the rotating power 21 is an electric motor, and can also be a hydraulic motor or other components capable of outputting rotating power, which drives the rotating plate 6 to rotate to realize automatic cleaning of the first filter screen 8.

[0032] As shown in Figures 1-8 The filter cylinder 7 is fixedly installed with a plurality of support plates 13 on the side surface, the support plates 13 are slidably installed with slide rods 14, the axis of the slide rods 14 is parallel to the axis of the filter cylinder 7, and the end of the slide rod 14 close to the end of the inclined section of the filter cylinder 7 is fixedly installed with a conical cover plate 15 for closing the first filter screen 8, the end of one of the slide rods 14 away from the cover plate 15 is fixedly installed with an arc-shaped push plate 17, the surface of the push plate 17 close to the support plate 13 is fixedly installed with an elastic element 16, and the elastic element 16 is fixedly connected with the support plate 13.

[0033] Specifically, the mounting plate 20 is fixedly installed with an extension element 23, the output end of the extension element 23 is fixedly installed with a ball 24, and the projection of the rotating track of the push plate 17 to the mounting plate 20 covers the position where the extension element 23 is located.

[0034] Specifically, the outer side of the shell 1 is fixedly installed with an air extractor 29, the air extractor 29 is communicated with a first air extraction pipe 26 extending into the shell 1, the end of the first air extraction pipe 26 is rotatably connected with a connecting cylinder 27, the connecting cylinder 27 is communicated with two groups of second air extraction pipes 28, and the end of the second air extraction pipe 28 away from the connecting cylinder 27 is communicated with the corresponding collecting cavity 9 on the filter cylinder 7.

[0035] Specifically, the filter cylinder 7 is slidably installed with a baffle 18, the baffle 18 is fixedly connected with the cover plate 15 through a connecting plate 19, and the baffle 18 is used to close the second air extraction pipe 28.

[0036] Specifically, the air extractor 29 is communicated with a collecting box 30 at the air outlet end, the collecting box 30 is fixedly installed with a second filter screen 31, the position where the air outlet end of the air extractor 29 is connected with the collecting box 30 is located on the side of the second filter screen 31 away from the shell 1, the collecting box 30 is communicated with a backflow pipe 33, the backflow pipe 33 extends into the shell 1 and is located between the guide cylinder 4 and the air inlet pipe 2, and the collecting box 30 is provided with a box door 32 for cleaning the internal smoke dust.

[0037] Specifically, the separation cylinder 5 is fixedly installed with an arc-shaped closing plate 34 for closing the inlet of the filter cylinder 7.

[0038] In actual application, after a set time, a large amount of smoke dust impurities is collected in the collecting cavity 9. When a group of filter cartridges 7 rotates to a position where the push plate 17 can contact the ball 24, the connecting position of the second air suction pipe 28 and the connecting barrel 27 is located at the lower side of the filter cartridge 7. At this time, the telescopic part 23 is elongated to drive the ball 24 to contact and push the push plate 17 to move. The push plate 17 drives the cover plate 15 to move and compresses the elastic part 16. When the cover plate 15 contacts and completely covers the first filter screen 8, the movement is stopped. When the cover plate 15 moves, the connecting plate 19 drives the baffle 18 to move to remove the closure of the second air suction pipe 28. At this time, the air blower 29 works. The air blower 29 sucks the smoke dust impurities in the collecting cavity 9 through the first air suction pipe 26 and the second air suction pipe 28 and transports them into the collecting box 30. At this time, the smoke gas entering the group of filter cartridges 7 from the separation cylinder 5 moves along the filter cartridge 7 and is sucked out by the air blower 29, so that the airflow with a stable flow direction is formed in the filter cartridge 7. The flow of the smoke gas makes the smoke dust impurities existing in the filter cartridge 7 move into the collecting cavity 9, realizes further cleaning of the smoke dust impurities in the filter cartridge 7 and on the first filter screen 8, further guarantees the filtering effect of the first filter screen 8, improves the cleaning effect of the smoke dust impurities in the filter cartridge 7, and the smoke gas carrying the smoke dust impurities enters the collecting box 30. The smoke gas passes through the second filter screen 31 and enters the shell 1 again through the backflow pipe 33. The second filter screen 31 avoids the smoke dust impurities from entering the shell 1 again. After long-time use, the smoke dust impurities in the collecting box 30 can be cleaned by opening the box door 32, and the use of the equipment is not affected. When the end of the filter cartridge 7 moves to the position where the closing plate 34 contacts, the telescopic part 23 is contracted. Under the action of the elastic part 16, the push plate 17 is reset to remove the closure of the first filter screen 8. With the reset of the push plate 17, the baffle 18 slowly closes the second air suction pipe 28. When the end of the filter cartridge 7 is completely closed by the closing plate 34, during the closing process of the second air suction pipe 28, the filtered smoke gas in the shell 1 enters the filter cartridge 7 in the reverse direction, so that the filter cartridge 7 is cleaned again by the clean smoke gas and the first filter screen 8 is cleaned by back blowing, which further guarantees the filtering effect of the first filter screen 8 and improves the cleaning effect of the smoke dust impurities in the filter cartridge 7. When the push plate 17 is reset, the air blower 29 stops working. With the rotation of the rotating plate 6, the closing plate 34 no longer closes the filter cartridge 7. The subsequent smoke gas can enter the filter cartridge 7 again for filtering operation.

[0039] In an example of the present application, the telescopic part 23 is an electric telescopic rod, which can also be a hydraulic cylinder or other components capable of actively changing the length. The push plate 17 is moved by the electric telescopic rod. The elastic part 16 is a spring, which can also be a spring ball or other elastic components. The spring applies a reset pushing force to the push plate 17.

[0040] The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0041] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A device for preventing ash blockage in a flue heat exchanger of a thermal power plant, comprising a shell (1), with an inlet pipe (2) and an outlet pipe (3) respectively connected to both ends of the shell (1), characterized in that, A guide cylinder (4) is fixedly installed inside the housing (1). The opening of the guide cylinder (4) faces the air inlet pipe (2) and the air outlet of the guide cylinder (4) is connected to the separation cylinder (5). A rotating plate (6) is rotatably installed inside the separation cylinder (5). Two sets of filter cylinders (7) connected to the separation cylinder (5) are fixedly installed on the rotating plate (6). The filter cylinder (7) is provided with an inclined section and a first filter screen (8) is fixedly installed on the side wall of the inclined section. The end of the filter cylinder (7) away from the rotating plate (6) is set as a collection chamber (9). A rotating shaft (10) is rotatably installed inside the filter cylinder (7). The rotating shaft (10) is coaxially arranged with the filter cylinder (7) and a scraper (12) is fixedly installed on the rotating shaft (10). The scraper (12) slides in contact with the inclined section of the filter cylinder (7) and is used to clean the first filter screen (8). A counterweight (11) is fixedly installed on the rotating shaft (10). A rotating power component (21) that drives the rotating plate (6) to rotate is provided inside the housing (1).

2. The anti-ash-clogging device suitable for flue gas heat exchangers in thermal power plants according to claim 1, characterized in that, The diameter of the inclined section of the filter cylinder (7) gradually increases in the direction away from the rotating plate (6), and the rotating shaft (10) is located in the collection chamber (9).

3. The anti-ash-clogging device suitable for flue gas heat exchangers in thermal power plants according to claim 1, characterized in that, An installation plate (20) is fixedly installed inside the housing (1). A rotating power component (21) is fixedly installed on the installation plate (20) and its output end points toward the rotating plate (6). A gear (22) is fixedly installed at the output end of the rotating power component (21). The gear (22) meshes with a gear ring (25) fixedly installed on the rotating plate (6). The gear ring (25) is coaxially arranged with the rotating plate (6).

4. The anti-ash-clogging device suitable for flue gas heat exchangers in thermal power plants according to claim 3, characterized in that, Multiple sets of support plates (13) are fixedly installed on the side of the filter cylinder (7). A slide rod (14) is slidably installed on the support plate (13). The axis of the slide rod (14) is parallel to the axis of the filter cylinder (7). A tapered cover plate (15) for sealing the first filter screen (8) is fixedly installed at one end of the slide rod (14) near the inclined section of the filter cylinder (7). An arc-shaped push plate (17) is fixedly installed at the end of one set of slide rods (14) away from the cover plate (15). An elastic element (16) is fixedly installed on the surface of the push plate (17) near the support plate (13). The elastic element (16) is fixedly connected to the support plate (13).

5. The anti-ash-clogging device suitable for flue gas heat exchangers in thermal power plants according to claim 4, characterized in that, A telescopic component (23) is fixedly installed on the mounting plate (20). A ball bearing (24) is fixedly installed at the output end of the telescopic component (23). The rotation trajectory of the push plate (17) is projected onto the mounting plate (20) and covers the position of the telescopic component (23).

6. The anti-ash-clogging device suitable for flue gas heat exchangers in thermal power plants according to claim 4, characterized in that, A blower (29) is fixedly installed on the outer side of the housing (1). The blower (29) is connected to a first exhaust pipe (26) that extends into the housing (1). The end of the first exhaust pipe (26) is rotatably connected to a connecting cylinder (27). Two sets of second exhaust pipes (28) are connected to the connecting cylinder (27). The end of the second exhaust pipe (28) away from the connecting cylinder (27) is connected to the collection chamber (9) on the corresponding filter cylinder (7).

7. The anti-ash-clogging device suitable for flue gas heat exchangers in thermal power plants according to claim 6, characterized in that, A baffle (18) is slidably installed on the filter cartridge (7). The baffle (18) is fixedly connected to the cover plate (15) through the connecting plate (19) and the baffle (18) is used to close the second suction pipe (28).

8. The anti-ash-clogging device suitable for flue gas heat exchangers in thermal power plants according to claim 7, characterized in that, The exhaust fan (29) is connected to a collection box (30). A second filter (31) is fixedly installed inside the collection box (30). The exhaust fan (29) is connected to the collection box (30) on the side of the second filter (31) away from the housing (1). A return pipe (33) is connected to the collection box (30). The return pipe (33) extends into the housing (1) and is located between the guide tube (4) and the air inlet pipe (2). The collection box (30) is provided with a door (32) for cleaning the internal smoke and dust.

9. The anti-ash-clogging device suitable for flue gas heat exchangers in thermal power plants according to claim 1, characterized in that, An arc-shaped sealing plate (34) for sealing the inlet of the filter cylinder (7) is fixedly installed inside the separation cylinder (5).

Images