Thermal power plant boiler flue gas multi-layer filtering device

Abstract

The utility model discloses a thermal power plant boiler flue gas multi-layer filtering device which comprises a filtering channel, and further comprises a filtering net, a cleaning assembly and a discharging channel which are arranged on the filtering channel, the filtering net is of a hopper-shaped screen structure, a transverse partition is fixed in the filtering channel, the cleaning assembly comprises a driving structure and a scraping plate, the scraping plate is rotationally connected to the filtering net, and the discharging channel is arranged on the filtering channel. The scraper is contacted with the lower surface of the filter screen; the driving structure is used for driving the scraper to rotate; a blocking cylinder is fixedly installed in the filtering channel and located below the filtering net, the side face of the blocking cylinder is arranged to be an obliquely-downward curved face or slope face, an opening is formed in the center of the blocking cylinder, the discharging channel is arranged on the side portion of the filtering channel, and a driving structure in the cleaning assembly drives a scraping plate to scrape away impurities accumulated on the bottom face of the filtering net and enables the impurities to fall onto the blocking cylinder. After the impurities fall to the bottom of the blocking cylinder along the side face of the blocking cylinder, the discharging channel is arranged at the corresponding position of the filtering channel for cleaning and discharging, and internal structures such as a filter screen are prevented from being detached for cleaning.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas filtering, and more specifically, to a multi-layer filtering device for flue gas of a boiler in a thermal power plant. Background Art

[0002] China's authorized patent announcement number: CN218924166U records "a multi-layer filter device for boiler flue gas in a thermal power plant", which adopts mounting components and movable components. By setting a cross bar at the top of the filter box, and notches and grooves at the top and bottom of the filter box, the filter box can be inserted and pulled out of the filter box. The drawer-like setting is convenient for cleaning the filter screen inside the filter box, as well as replacing the cotton cloth and activated carbon, thereby extending the service life of the filter box and improving the overall practicality of the device.

[0003] The prior art has the following defects and shortcomings: the filter needs to be removed first when cleaning, and the filter is in the first layer structure of flue gas purification, so it is most likely to accumulate impurities and the cleaning frequency is also the highest, so repetitive disassembly and assembly work will result in greater manpower consumption; the utility model provides a multi-layer filter device for boiler flue gas in a thermal power plant to solve the above problems and realize quick cleaning of the filter. Utility Model Content

[0004] In view of the above defects or improvement needs of the prior art, the utility model provides a multi-layer filtration device for boiler flue gas in a thermal power plant, which can remove and discharge impurities on the filter screen without removing the filter screen and other structures inside the filter channel.

[0005] In order to achieve the above-mentioned purpose, according to the utility model, a multi-layer filter device for boiler flue gas in a thermal power plant is provided, comprising a filter channel, a filter screen, a cleaning component and a discharge channel arranged on the filter channel, the filter screen is a bucket-shaped screen structure, and a diaphragm is fixed in the filter channel, the cleaning component comprises a driving structure and a scraper, the scraper is rotatably connected to the filter screen, the scraper contacts the filter screen portion on the lower surface of the filter screen, and the driving structure is transmission-connected to the scraper for driving the scraper to rotate;

[0006] A retaining cylinder is fixedly installed in the filter channel, the retaining cylinder is located directly below the filter screen, the side surface of the retaining cylinder is set as a curved surface or slope surface inclined downward, an opening is set in the center of the retaining cylinder, and the discharge channel is set at the side of the filter channel and below the filter screen;

[0007] During operation, smoke can pass through the openings on the filter screen and the baffle cylinder. The driving structure in the cleaning component drives the scraper to scrape off the impurities accumulated on the bottom surface of the filter screen and make the impurities fall onto the baffle cylinder. Since the side surface of the baffle cylinder is a downward curved surface or slope, the impurities fall along the side surface of the baffle cylinder to the bottom of the baffle cylinder. A discharge channel is set at the corresponding position of the filter channel, so that the impurities can be regularly cleaned and discharged.

[0008] Furthermore, a hard arc plate is provided at the bottom of the filter, and the arc plate is used to install the scraper. The purpose of providing the arc plate is that the hard structure is more convenient for installing components such as scrapers and rotating shafts than the filter, and the area where the arc plate is located corresponds to the opening of the baffle at the bottom to prevent impurities from falling into the opening from this area.

[0009] Furthermore, the driving structure includes a rotating shaft, a turning handle, a driving bevel gear, a transmission shaft, and a driven bevel gear. The transmission shaft is rotatably connected to the arc plate, the scraper is fixed to the lower end of the transmission shaft, the upper end of the transmission shaft is axially connected to the driven bevel gear, the driven bevel gear is meshingly connected to the driving bevel gear, the end of the rotating shaft is axially connected to the driving bevel gear, the rotating shaft extends outward to pass through the side wall of the filter channel, the turning handle is fixedly set at the outer end of the rotating shaft, the rotating shaft is rotatably connected to the side wall of the filter channel, and the scraper can be conveniently driven to rotate by manually turning the turning handle.

[0010] Furthermore, the scraper is provided with multiple pieces, and is evenly distributed and fixed on the transmission shaft. The scraping efficiency can be improved by providing multiple scrapers.

[0011] Furthermore, the scraper includes a connecting portion and a scraper blade, wherein the two ends of the connecting portion are connected and fixed to the transmission shaft and the scraper blade, and the connecting portion has no contact with the surface of the arc plate when rotating, and the scraper blade is in close contact with the bottom surface of the filter screen. This arrangement allows the scraper blade to contact the bottom of the filter screen while avoiding contact and wear between the connecting portion and the arc plate.

[0012] Furthermore, a frame is provided at the edge of the filter screen, and the frame is used to be fixedly connected to the inner wall of the filter channel.

[0013] Furthermore, a first discharge port and an internal cavity are provided on the outer wall of the filter channel, the filter channel is connected with the internal cavity through the first discharge port, a second discharge port is provided at the bottom of the internal cavity, and the second discharge port is closed by a sealing plate; the lowest point of the first discharge port and the lowest point of the retaining cylinder are in the same horizontal plane, and the internal cavity is convenient for receiving accumulated impurities, and making the first discharge port flush with the bottom of the retaining cylinder can prevent impurities from docking in the gap space between the retaining cylinder and the inner wall of the filter channel.

[0014] Furthermore, an extension plate and a ring plate are provided on the outer wall of the filter channel, and the two and the outer wall of the filter channel are combined to form an internal cavity, and the second discharge port is opened on the ring plate.

[0015] Furthermore, the diameter of the opening is smaller than the diameter of the arc-shaped plate, so as to prevent impurities from falling from the edge of the arc-shaped plate into the opening.

[0016] Furthermore, flanges are provided at both ends of the filter channel for fixed connection with other structures.

[0017] In general, the above technical solutions conceived by the utility model can achieve the following beneficial effects compared with the prior art:

[0018] (1) The utility model provides a multi-layer filtering device for boiler flue gas in a thermal power plant. A filter screen is arranged on the internal partition of the filter channel for the flue gas to pass through and filter impurities at the same time. The filter screen is arranged in a bucket shape, and a scraper for scraping off impurities is arranged on the bottom surface of the filter screen, so that the filter screen can be cleaned without disassembly. In order to facilitate the discharge of fallen impurities from the filter channel, a boss-shaped retaining cylinder is arranged below the filter screen in the channel, and an opening is arranged in the center of the retaining cylinder for the flue gas to pass through. After the impurities fall on the boss-shaped slope, they slide down to the discharge channel on the side of the filter channel, thereby realizing the cleaning, collection and discharge process of the impurities. It can be completed without disassembling the structure in the filter channel, and the cleaning process is more convenient and quick.

[0019] (2) The utility model provides a multi-layer filter device for boiler flue gas in a thermal power plant. The discharge channel used includes a first discharge port arranged on the side wall of the filter channel and an internal cavity covering the outside of the first discharge port. The cavity is used to collect impurities that slide off the retaining cylinder and accumulate. The bottom of the cavity is provided with a second discharge port and a detachable closing plate. The closing plate can be removed to clean and discharge the accumulated impurities.

[0020] (3) The utility model provides a multi-layer filtration device for boiler flue gas in a thermal power plant, wherein a cleaning assembly is arranged on the filtration channel, and the cleaning assembly includes a scraper for scraping the filter screen and a driving mechanism. The scraper is provided with multiple pieces in contact with the bottom surface of the filter screen, and the driving mechanism transmits the driving force to the scraper through a gear meshing transmission method. The driving mechanism can work manually or by an external power source. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a multi-layer filter device for boiler flue gas in a thermal power plant provided by the utility model;

[0022] Figure 2 The utility model shown in Figure 1 A schematic diagram of a partial cross-sectional structure;

[0023] Figure 3The utility model shown in Figure 2 Schematic diagram of the structure of the filtration channel;

[0024] Figure 4 This is a schematic structural diagram of the cleaning component and the filter screen shown in the present invention.

[0025] In all the drawings, the same figure numbers represent the same technical features, specifically: 1. filtration channel; 2. filter screen; 3. arc plate; 4. cleaning component; 41. rotating shaft; 42. turning handle; 43. driving bevel gear; 44. transmission shaft; 45. driven bevel gear; 46. scraper; 461. connecting part; 462. scraper; 5. baffle cylinder; 6. first discharge port; 7. extension plate; 8. ring plate; 9. second discharge port; 10. closing plate. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figure 1-Figure 4 As shown, this embodiment provides a multi-layer filter device for boiler flue gas in a thermal power plant, including a filter channel 1, and also including a filter screen 2, a cleaning component 4 and a discharge channel arranged on the filter channel 1. It should be pointed out that, for the convenience of description, the "central axis" recorded in the text refers to the central axis of the filter channel 1, the "longitudinal" refers to the direction along the "central axis", and the "horizontal plane" refers to the plane perpendicular to the "central axis", wherein the filter channel 1 is a pipeline structure, and mounting parts are provided at both ends thereof for fixed installation and communication with other structures; the filter screen 2 is a bucket-shaped screen structure, and is fixed inside the filter channel 1 along the cross-sectional direction of the filter channel 1, and the edge of the filter screen 2 is fixed to the inner wall of the filter channel 1 The filter screen 2 allows the flue gas to pass normally and filters out dust and other particulate matter in the flue gas, thereby achieving the purpose of reducing environmental pollution; further, the cleaning component 4 includes a driving structure and a scraper 46, wherein the scraper 46 is rotatably connected to the bottom of the filter screen 2 and contacts the lower surface of the filter screen part of the filter screen 2, and is used to clean up impurities and make them fall off. The driving structure is arranged on the filter channel 1, and the driving mechanism is connected to an external power source and is transmission-connected to the scraper 46, and is used to drive the scraper 46 to rotate, clean the impurities accumulated on the filter screen 2 and drop them to the bottom of the filter channel 1; the discharge channel is arranged on the side of the filter channel 1, located below the filter screen 2, and is used to discharge the fallen impurities from the filter channel 1, thereby achieving convenient cleaning.

[0028] Furthermore, if Figure 1 and Figure 2 As shown, an arc plate 3 is arranged at the bottom of the filter 2, and the arc plate 3 is a hard structure for installing a scraper 46. Specifically, a through hole is arranged at the center of the filter 2, and the arc plate 3 is closed and covers the center of the filter 2. Preferably, the filter 2 extends smoothly along the lower edge of the through hole of the filter 2 to form a conical structure downward.

[0029] Furthermore, if Figure 1-Figure 4 As shown, the driving structure includes a rotating shaft 41, a turning handle 42, an active bevel gear 43, a transmission shaft 44, and a driven bevel gear 45, wherein the transmission shaft 44 is rotatably connected to the arc plate 3 along the central axis of the filter channel 1, and a scraper 46 is fixed to the lower end of the transmission shaft 44, and a driven bevel gear 45 is axially connected to the upper end of the transmission shaft 44, and the bevel gear 45 is meshed and transmission-connected with the active bevel gear 43, and the end of the rotating shaft 41 is axially connected to the active bevel gear 43, and the rotating shaft 41 extends outward away from the central axis to pass through the side wall of the filter channel 1, and the rotating shaft 41 is rotatably connected to the side wall of the filter channel 1, and a turning handle 42 is fixedly arranged at the outer end of the rotating shaft 41 away from the central axis. By manually rotating the turning handle 42, the driving force is transmitted to the driven bevel gear 45 through the active bevel gear 43, so that the transmission shaft 44 and the scraper 46 rotate; it should be pointed out that the transmission mode of the above-mentioned driven bevel gear 45 and the active bevel gear 43 can be transformed into other gear transmission modes with transmission functions, and the turning handle 42 can also be replaced by a rotating power source.

[0030] Furthermore, if Figure 4 As shown, multiple scrapers 46 can be provided, which are evenly distributed around the circumference and fixed on the transmission shaft 44. The scraper 46 includes a connecting portion 461 and a scraper blade 462, wherein the connecting portion 461 has two ends connected to the fixed transmission shaft 44 and the scraper blade 462, and the connecting portion 461 does not contact the surface of the arc plate 3 when rotating. The connecting portion 461 has a certain arc so that the scraper blade 462 is in contact with the bottom surface of the filter screen 2, so as to scrape off accumulated dust and other impurities.

[0031] Furthermore, if Figure 1 As shown, a retaining cylinder 5 is fixedly installed directly below the filter screen 2 in the filter channel 1. The retaining cylinder 5 is a vertically arranged conical structure or a boss shape, and its axis coincides with the axis of the filter channel 1. Preferably, the side surface of the retaining cylinder 5 is arranged as a downwardly inclined curved surface or slope surface, which can catch the impurities cleaned from the filter screen 2 and make the impurities fall to the bottom of the retaining cylinder 5 under the action of gravity; a storage space is formed between the retaining cylinder 5 and the inner wall of the filter channel 1, and the impurities cleaned by the scraper 46 fall into the storage space between the retaining cylinder 5 and the filter channel 1, and after falling on the slope of the retaining cylinder 5, continue to roll downward and accumulate to the bottom. Furthermore, an opening is arranged in the center of the retaining cylinder 5, and the diameter of the opening is smaller than the diameter of the arc plate 3, so as to prevent impurities on the edge of the arc plate 3 from falling into the opening, and the opening can allow smoke to pass normally.

[0032] Furthermore, in order to ensure a stabilizing effect, a frame may be provided at the edge of the filter screen 2 for fixed connection with the inner wall of the filter channel 1 .

[0033] Furthermore, the mounting portion may be a flange, which is fixedly disposed at both ends of the filter channel 1. The filter channel 1 may be fixed to the boiler at one end through the flange, while the other end may be connected to other equipment or pipeline structures. Preferably, a multi-layer filter screen 2, an arc plate 3 and a cleaning component 4 structure may be disposed inside the filter channel 1.

[0034] Furthermore, if Figure 1-Figure 3 As shown, the discharge channel includes a first discharge port 6, an extension plate 7, a ring plate 8, a second discharge port 9 and a closing plate 10. The first discharge port 6 is opened on the outer wall of the filter channel 1, and a plurality of discharge ports 6 can be arranged evenly distributed along the circumference of the central axis of the filter channel 1. The lowest point of the first discharge port 6 is at the same horizontal plane as the lowest point of the retaining cylinder 5. When the scraped impurities fall on the slope of the retaining cylinder 5, they fall to the first discharge port 6 at the bottom of the retaining cylinder 5, and then are cleaned and discharged; further, the outer wall of the filter channel 1 is also fixedly installed with an extension plate 7 and a ring plate 8, and the internal cavity formed by the three is connected with the filter channel 1 through the first discharge port 6, wherein the extension plate 7 and the ring plate 8 are adapted to the shape of the outer wall of the filter channel 1, and the ring plate 8 is arranged horizontally and welded and fixed to the extension plate 7 and the filter channel The outer wall of the filter channel 1 is covered by the extension plate 7 and is arranged above the ring plate 8. Preferably, the extension plate 7 and the filter channel 1 have a certain slope and are fixedly arranged obliquely downward to prevent impurities outside the filter channel 1 from accumulating in the exposed angle between the extension plate 7 and the filter channel 1. Furthermore, the ring plate 8 is provided with a plurality of circumferentially distributed second discharge ports 9 at intervals, and the lower end of the ring plate 8 can also be detachably installed with a closing plate 10 for closing the second discharge port 9. When the closing plate 10 is closed, impurities fall into the first discharge port 6 through the slope of the retaining cylinder 5 and enter the internal cavity. Preferably, the second discharge port 9 corresponds to the position and number of the first discharge port 6, so that impurities directly fall into the second discharge port 9 through the first discharge port 6. After the closing plate 10 is removed, the impurities can be discharged from the second discharge port 9.

[0035] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-layer filter device for boiler flue gas in a thermal power plant, comprising a filter channel (1), characterized in that: It also comprises a filter screen (2), a cleaning assembly (4) and a discharge channel arranged on the filter channel (1); the filter screen (2) is a bucket-shaped screen structure, and a partition is fixed in the filter channel (1); the cleaning assembly (4) comprises a driving structure and a scraper (46); the scraper (46) is rotatably connected to the filter screen (2); the scraper (46) contacts the filter screen portion on the lower surface of the filter screen (2); the driving structure is in driving connection with the scraper (46) and is used to drive the scraper (46) to rotate; A retaining cylinder (5) is fixedly installed in the filtering channel (1), and the retaining cylinder (5) is located directly below the filtering screen (2). The side surface of the retaining cylinder (5) is arranged as a curved surface or a slope inclined downward, and an opening is arranged at the center of the retaining cylinder (5). The discharge channel is arranged on the side of the filtering channel (1) and is located below the filtering screen (2).

2. A multi-layer filter device for boiler flue gas in a thermal power plant according to claim 1, characterized in that: A hard arc-shaped plate (3) is arranged at the bottom of the filter screen (2), and the arc-shaped plate (3) is used to install the scraper (46).

3. A multi-layer filtration device for boiler flue gas in a thermal power plant according to claim 2, characterized in that: The driving structure comprises a rotating shaft (41), a turning handle (42), a driving bevel gear (43), a transmission shaft (44), and a driven bevel gear (45); the transmission shaft (44) is rotatably connected to the arc plate (3); the scraper (46) is fixed to the lower end of the transmission shaft (44); the upper end of the transmission shaft (44) is axially connected to the driven bevel gear (45); the driven bevel gear (45) is meshingly connected to the driving bevel gear (43); the end of the rotating shaft (41) is axially connected to the driving bevel gear (43); the rotating shaft (41) extends outward to pass through the side wall of the filtering channel (1); the turning handle (42) is fixedly arranged at the outer end of the rotating shaft (41); and the rotating shaft (41) is rotatably connected to the side wall of the filtering channel (1).

4. A multi-layer filter device for boiler flue gas in a thermal power plant according to claim 3, characterized in that: The scraper (46) is provided in multiple pieces and is evenly distributed around the circumference and fixed on the transmission shaft (44).

5. The multi-layer filtration device for boiler flue gas in a thermal power plant according to claim 3, characterized in that: The scraper (46) comprises a connecting portion (461) and a scraper blade (462); the two ends of the connecting portion (461) are connected and fixed to the transmission shaft (44) and the scraper blade (462); when the connecting portion (461) rotates, it has no contact with the surface of the arc plate (3); and the scraper blade (462) is in close contact with the bottom surface of the filter screen (2).

6. The multi-layer filtration device for boiler flue gas in a thermal power plant according to claim 1, characterized in that: A frame is provided at the edge of the filter screen (2), and the frame is used to be fixedly connected to the inner wall of the filter channel (1).

7. The multi-layer filtration device for boiler flue gas in a thermal power plant according to claim 1, characterized in that: The outer wall of the filter channel (1) is provided with a first discharge port (6) and an internal cavity; the filter channel (1) is connected to the internal cavity via the first discharge port (6); a second discharge port (9) is provided at the bottom of the internal cavity; the second discharge port (9) is closed by a sealing plate (10); the lowest point of the first discharge port (6) is in the same horizontal plane as the lowest point of the retaining cylinder (5).

8. A multi-layer filter device for boiler flue gas in a thermal power plant according to claim 7, characterized in that: An extension plate (7) and a ring plate (8) are arranged on the outer wall of the filter channel (1), and the two plates and the outer wall of the filter channel (1) together form an internal cavity, and the second discharge port (9) is opened on the ring plate (8).

9. The multi-layer filtration device for boiler flue gas in a thermal power plant according to claim 2, characterized in that: The diameter of the opening is smaller than the diameter of the arc-shaped plate (3).

10. A thermal power plant boiler flue gas multi-layer filtering device according to any one of claims 1 to 5, characterized in that: One end of the filtering channel (1) is fixed to the boiler via a flange.

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