Powder feeding device for flue gas demercuration

Abstract

The utility model discloses a powder feeding device for flue gas demercuration, which comprises a connecting pipe assembly arranged between flue gas pipelines in a communicated manner; the powder tank is arranged at the top of the connecting pipe assembly in a communicating mode, a feeding hopper is arranged at the top of the powder tank in a communicating mode, and a flange discharging opening is formed in the bottom of the powder tank; the stirring and feeding assembly is rotationally arranged in an inner cavity of the powder tank and used for stirring and outputting the powdery adsorbent stored in the powder tank; and the driving assembly is fixedly arranged at the top of the powder tank and used for driving the stirring and feeding assembly to rotate. The device is compact in structure, powdery materials in the powder tank directly enter the connecting pipe assembly after being stirred by the stirring feeding assembly and output, mercury in smoke flowing through the powdery materials is adsorbed, the whole conveying link of the powdery materials is short, the blockage clearing component composed of the wall scraping frame and the stirring plate is arranged in the powder tank, and the blockage clearing effect is good. And the possibility of powder blockage is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas mercury removal, in particular to a powder feeding device for flue gas mercury removal. Background Art

[0002] With the acceleration of industrialization, environmental protection issues are receiving increasing attention. The flue gas generated during coal combustion contains a large amount of harmful substances, among which mercury (Hg), a heavy metal pollutant, has great harm to the environment and human health.

[0003] Currently, common flue gas mercury removal technologies include activated carbon adsorption and wet scrubbing. One of the more common methods involves injecting powdered adsorbents into the flue to adsorb mercury. Common adsorbents include activated carbon, modified fly ash, and nano-iron oxide. These adsorbents are susceptible to moisture and hardening, which can clog the powder feeding device and negatively impact the flue gas mercury removal rate.

[0004] Prior art, such as the powder feeding device for flue gas mercury removal described in Chinese utility model patent CN218753774U, utilizes a screw conveyor in conjunction with a vibrating screen to effectively reduce the probability of powder clogging and achieve a continuous and stable supply of powdered adsorbent. However, in practice, due to the long powder conveying path and the inability to prevent powder compaction within the powder tank, this device still presents a certain risk of powder clogging, making it unsuitable for use.

[0005] To this end, the present application proposes a powder feeding device for flue gas mercury removal to solve the above technical problems. Utility Model Content

[0006] The main purpose of the utility model is to solve the above-mentioned shortcomings and provide a powder feeding device for flue gas mercury removal, shorten the powder material conveying link, and set a special clearing component in the powder tank to further reduce the possibility of powder material clogging in the device.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A powder feeding device for flue gas mercury removal comprises: a connecting pipe assembly, communicatively arranged between flue gas ducts; a powder tank, communicatively arranged at the top of the connecting pipe assembly, the top of the powder tank being communicatively provided with a feed hopper, and the bottom being provided with a flange discharge port; a stirring and feeding assembly, rotatably arranged in the inner cavity of the powder tank, for stirring and discharging the powdered adsorbent stored in the powder tank; and a driving assembly, fixedly arranged at the top of the powder tank, for driving the stirring and feeding assembly to rotate.

[0009] Furthermore, the stirring feeding assembly includes a rotating bracket fixedly arranged at the bottom end of the powder tank, a scraping frame rotatably arranged on the rotating bracket, a plurality of stirring plates evenly arranged and fixedly arranged on the scraping frame, and a spiral shaft fixedly arranged at the bottom of the scraping frame.

[0010] Furthermore, the scraper frame abuts against the inner wall of the powder tank, and the edges on both sides are sharply chamfered.

[0011] Furthermore, the connecting pipe assembly includes a main pipe, a flange connection port arranged on the main pipe for connecting to the flange discharge port, an outward-expanding bell pipe fixedly arranged at both ends of the main pipe, and a flange plate fixedly arranged at the end of the outward-expanding bell pipe.

[0012] Furthermore, the main pipe is provided with a gas nozzle for connecting to an external high-pressure gas source.

[0013] Furthermore, the spiral shaft extends into the flange connection port but does not enter the inner cavity of the main pipe.

[0014] Furthermore, the drive assembly includes a bevel gear shaft fixedly arranged on the top of the scraper frame, a motor fixedly arranged on the top of the powder tank, a reducer fixedly arranged on the top of the powder tank and having its input end transmission-connected to the output end of the motor, and a bevel gear transmission shaft transmission-connected at the output end of the reducer and meshing with the bevel gear shaft.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The utility model has a compact structure. The powdered material in the powder tank is stirred and discharged by the stirring feeding assembly and then directly enters the connecting pipe assembly to absorb mercury in the flue gas flowing through. The overall conveying link of the powdered material is short, and a blockage clearing component composed of a scraper frame and a stirring plate is provided in the powder tank, which greatly reduces the possibility of blockage of the powder.

[0017] 2. The utility model reduces the flow cross-section of the flue gas by providing a connecting pipe assembly with outward-flared trumpet tubes at both ends, compared with the flue gas duct, so that the flue gas can more easily and fully contact the powder adsorbent in the main pipe, thereby improving the adsorption effect of mercury in the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the installation position of an embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of the main structure of the stirring feeding component according to one embodiment of the present utility model.

[0022] In the figure: 1. Flue gas duct; 2. Connecting pipe assembly; 21. Main pipe; 22. Flange connection port; 23. Outward-flared bell pipe; 24. Flange; 3. Powder tank; 4. Feed hopper; 5. Stirring feeding assembly; 51. Rotating bracket; 52. Scraper frame; 53. Stirring plate; 54. Screw shaft; 6. Drive assembly; 61. Bevel gear shaft; 62. Motor; 63. Reducer; 64. Bevel gear transmission shaft; 7. Flange outlet; 8. Air nozzle. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] like Figure 1-3 As shown, the utility model provides a powder feeding device that can be used in the field of flue gas mercury removal, including:

[0025] The connecting pipe assembly 2 is connected and arranged between the flue gas ducts 1; the powder tank 3 is connected and arranged at the top of the connecting pipe assembly 2, and the top of the powder tank 3 is connected and arranged with a feed hopper 4, and the bottom is provided with a flange discharge port 7; the stirring and feeding assembly 5 is rotatably arranged in the inner cavity of the powder tank 3, and is used to stir and output the powdered adsorbent stored in the powder tank 3; the driving assembly 6 is fixedly arranged on the top of the powder tank 3, and is used to drive the stirring and feeding assembly 5 to rotate. The stirring and feeding assembly 5 includes a rotating bracket 51 fixedly arranged at the bottom end of the powder tank 3, a scraping frame 52 rotatably arranged on the rotating bracket 51, a plurality of stirring plates 53 evenly arranged and fixed on the scraping frame 52, and a spiral shaft 54 fixedly arranged at the bottom of the scraping frame 52. The scraping frame 52 abuts the inner wall of the powder tank 3, and the edges on both sides are sharp chamfered.

[0026] During use, the connecting pipe assembly 2 is connected to the powder tank 3 and connected to the flue gas duct 1, and the driving assembly 6 is started to drive the stirring and feeding assembly 5 to rotate. The scraper frame 52 scrapes off the powdered material adhering to the inner wall of the powder tank 3 when rotating, reducing the probability of powder blockage. The stirring plate 53 cuts and stirs the powdered material stored in the powder tank 3 when rotating to prevent blockage due to compaction. The spiral shaft 54 gradually discharges the powdered material in the powder tank 3 from the flange outlet 7 and enters the connecting pipe assembly 2 when rotating. The flue gas in the flue gas duct 1 fully contacts and mixes with the powder therein when flowing through the connecting pipe assembly 2, thereby achieving the effect of mercury removal.

[0027] The overall structure of the device is compact. The powdered material in the powder tank 3 is stirred and output by the stirring and feeding assembly 5 and then directly enters the connecting pipe assembly 2 to absorb mercury in the flue gas flowing through. The overall conveying link of the powdered material is short, and a blockage clearing component consisting of a scraper frame 52 and a stirring plate 53 is provided in the powder tank 3, which greatly reduces the possibility of blockage of the powder.

[0028] In one embodiment, the connecting pipe assembly 2 includes a main pipe 21, a flange connection port 22 connected to the main pipe 21 for connecting to the flange outlet 7, an outward-expanding bell pipe 23 fixedly arranged at both ends of the main pipe 21, and a flange plate 24 fixedly arranged at the end of the outward-expanding bell pipe 23.

[0029] With this design, the connecting pipe assembly 2 can be well sealed with the flue gas duct 1 by means of the flanges 24 at both ends, and can be sealed with the powder tank 3 through the flange connection port 22; when the flue gas flows through the outward-expanding bell tube 23 and enters the main pipe 21, the cross-section is reduced and the flow rate is increased, which can more fully react with the powder adsorbent in the main pipe 21 to remove the mercury therein.

[0030] In one embodiment, a gas nozzle 8 is provided on the main pipe 21 for connecting to an external high-pressure gas source.

[0031] With this design, high-pressure gas can enter the main pipe 21 through the gas nozzle 8, blowing away the powdered adsorbent input into the main pipe 21, making it more evenly dispersed in the main pipe 21, so as to better contact with the flue gas flowing through the main pipe 21, and more effectively remove mercury in the flue gas.

[0032] In one embodiment, the screw shaft 54 extends into the flange connection port 22 but does not enter the inner cavity of the main pipe 21 .

[0033] With this design, the powder material in the powder tank 3 can pass through the flange connection port 22 and enter the inner cavity of the main pipe 21 under the conveying action of the screw shaft 54, thereby preventing the powder material from being blocked in the flange connection port 22.

[0034] In one embodiment, the drive assembly 6 includes a bevel gear shaft 61 fixedly arranged on the top of the scraper frame 52, a motor 62 fixedly arranged on the top of the powder tank 3, a reducer 63 fixedly arranged on the top of the powder tank 3, and the input end of which is transmission-connected to the output end of the motor 62; and a bevel gear transmission shaft 64 transmission-connected to the output end of the reducer 63 and meshing with the bevel gear shaft 61.

[0035] With this design, the motor 62 is started, and the torque of the motor 62 is amplified by the reducer 63 to drive the bevel gear transmission shaft 64 to rotate. The bevel gear transmission shaft 64 then drives the bevel gear shaft 61 to rotate, and the scraper frame 52 rotates with it, thereby realizing the driving of the stirring feeding component 5.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0038] In addition, "multiple" means more than two. Furthermore, the technical solutions of the various embodiments may be combined with each other, but this must be based on the premise that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is mutually inconsistent or cannot be implemented, it shall be deemed that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A powder feeding device for flue gas mercury removal, characterized in that: Includes: A connecting pipe assembly (2) is arranged to communicate between the flue gas ducts (1); A powder tank (3) is connected to the top of the connecting pipe assembly (2), the top of the powder tank (3) is connected to a feed hopper (4), and the bottom is provided with a flange discharge port (7); A stirring feeding assembly (5) is rotated in the inner cavity of the powder tank (3) to stir and output the powdered adsorbent stored in the powder tank (3); A driving assembly (6) is fixedly arranged on the top of the powder tank (3) and is used to drive the stirring feeding assembly (5) to rotate.

2. A powder feeding device for flue gas mercury removal according to claim 1, characterized in that: The stirring feeding assembly (5) comprises a rotating bracket (51) fixedly arranged at the bottom end of the powder tank (3), a scraping frame (52) rotatably arranged on the rotating bracket (51), a plurality of stirring plates (53) evenly arranged and fixedly arranged on the scraping frame (52), and a spiral shaft (54) fixedly arranged at the bottom of the scraping frame (52).

3. The powder feeding device for flue gas mercury removal according to claim 2, characterized in that: The wall scraping frame (52) abuts against the inner wall of the powder tank (3), and the edges on both sides are sharp chamfered.

4. The powder feeding device for flue gas mercury removal according to claim 2, characterized in that: The connecting pipe assembly (2) comprises a main pipe (21), a flange connection port (22) arranged on the main pipe (21) for connecting to the flange discharge port (7), an outward-expanding bell pipe (23) fixedly arranged at both ends of the main pipe (21), and a flange plate (24) fixedly arranged at the end of the outward-expanding bell pipe (23).

5. The powder feeding device for flue gas mercury removal according to claim 4, characterized in that: The main pipe (21) is provided with a gas connection nozzle (8) for connecting to an external high-pressure gas source.

6. A powder feeding device for flue gas mercury removal according to claim 5, characterized in that: The spiral shaft (54) extends into the flange connection port (22) but does not enter the inner cavity of the main pipe (21).

7. The powder feeding device for flue gas mercury removal according to claim 2, characterized in that: The driving assembly (6) comprises a bevel gear rotating shaft (61) fixedly arranged on the top of the scraping frame (52), a motor (62) fixedly arranged on the top of the powder tank (3), a reducer (63) fixedly arranged on the top of the powder tank (3) and having an input end transmission-connected to the output end of the motor (62), and a bevel gear transmission shaft (64) transmission-connected to the output end of the reducer (63) and meshing with the bevel gear rotating shaft (61).

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