Returner of circulating fluidized bed

Abstract

The utility model discloses a material returning device of a circulating fluidized bed, which belongs to the technical field of circulating fluidized bed boilers, and comprises a cyclone separator and a vertical pipe arranged below the cyclone separator, a connecting cylinder is arranged between the cyclone separator and the vertical pipe, and the connecting cylinder is connected with the cyclone separator. A plurality of partition plates are fixedly connected to the inner side of the connecting cylinder, the partition plates are arranged at the axial position of the connecting cylinder at equal intervals, the inner side of the connecting cylinder can be divided into continuous S-shaped channels through the partition plates, and therefore the flowing speed of materials in the connecting cylinder can be effectively reduced, meanwhile, the materials are guided through inclined planes arranged at the partition plates, and the material conveying efficiency is improved. And under the action of air pressure, the sealing ball is burst open, and the spring is compressed and deformed, so that the speed of the material entering the vertical pipe can be further reduced, the abrasion of the material to the material returning sliding plate due to impact can be effectively reduced, the service life of the material returning sliding plate is prolonged, and the cost of integrally replacing the vertical pipe is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circulating fluidized bed boilers, and more specifically, to a return feeder of a circulating fluidized bed. Background Art

[0002] At present, during the operation of circulating fluidized bed units, there are two defects in the separation return feeder of circulating fluidized bed boilers: (1) Since there is a loose air cap at the bottom of the riser directly below the cyclone separator, the loose air blows the circulating ash upward. When the amount of circulating ash is small, it is easy to form a suspended layer of circulating ash at the riser, that is, the so-called "bridging" phenomenon; when the accumulated amount of circulating ash is large, it will suddenly collapse, which will form repeated pulsating ash transportation and cause vibration of the return feeder. (2) The circulating ash rotates in the separator, and larger particle ash will fall along the walls of the separator and the riser. A negative pressure is formed in the center of the separator and the riser, and the flue gas will leave the separator upward along the center and enter the tail flue. Under the action of the loose air, part of the fine ash is "lifted", and thus escapes from the separator upward under the entrainment of the negative pressure flue gas, reducing the separation efficiency of the separator.

[0003] The patent authorization number CN205191555U discloses a separation return feeder of a circulating fluidized bed boiler, including a riser. A cyclone separator is connected to the top of the riser (2), a return feeder is connected to the side of the bottom end of the riser, a return cylinder is connected to the return feeder, an inclined return slide plate is arranged on the bottom end surface of the riser, and a return air cap is arranged on the bottom surface of the return feeder. The structure is simple, the maintenance is convenient, the separation efficiency of the separation return feeder of the circulating fluidized bed boiler is improved, and the inducement of the return feeder vibration is eliminated.

[0004] However, in the patent authorization number CN205191555U, a cyclone separator is connected to the top of the riser, a return chamber is connected to the side of the bottom end of the riser, a return cylinder is connected to the return chamber, and an inclined return slide plate is arranged on the bottom end surface of the riser. Since the material accelerates and impacts the return slide plate for a long time when the cyclone separator returns material to the riser, the return slide plate is severely worn, resulting in the return slide plate being unable to work normally. Therefore, the entire riser needs to be replaced, increasing the replacement cost. In order to reduce the cost, we propose a return feeder of a circulating fluidized bed to solve the above existing problems. Content of the Utility Model

[0005] 1. Technical Problems to be Solved

[0006] In view of the problems existing in the prior art, the purpose of the present utility model is to provide a return feeder for a circulating fluidized bed, which can divide the inner side of the connecting cylinder into a continuously S-shaped channel through a partition plate, thereby effectively reducing the flow velocity of the material in the connecting cylinder. At the same time, the inclined surface provided at the partition plate is used to guide the material, and under the action of air pressure, the sealing ball is pushed open and the spring is compressed and deformed, which can further reduce the velocity of the material entering the riser pipe, thereby effectively reducing the wear of the return slide caused by the impact of the material, prolonging the service life of the return slide, and reducing the cost of overall replacement of the riser pipe.

[0007] 2. Technical solution

[0008] To solve the above problems, the present utility model adopts the following technical solutions.

[0009] A return feeder for a circulating fluidized bed includes a cyclone separator and a riser pipe installed below the cyclone separator. A connecting cylinder is installed between the cyclone separator and the riser pipe. A partition plate is fixedly connected to the inner side of the connecting cylinder. A plurality of partition plates are equidistantly arranged in the axial position of the connecting cylinder, and adjacent two partition plates are staggered. An inclined surface is provided at the top of the partition plate;

[0010] At one end of the riser pipe close to the connecting cylinder, a first ring plate and a second ring plate are fixedly connected from top to bottom respectively. A sealing ball is installed between the first ring plate and the second ring plate, and the sealing ball abuts against the bottom opening of the first ring plate. A spring is installed between the sealing ball and the second ring plate. Guide blocks are symmetrically installed on the outer wall of the sealing ball, and sliding grooves are provided on the inner wall of the riser pipe and are slidably connected to the ends of the guide blocks;

[0011] A return slide is fixedly connected to the bent part of the riser pipe close to the connecting cylinder.

[0012] Further, flange plates are fixedly connected to both ends of the connecting cylinder, and the flange plates are fixedly connected to the cyclone separator and the riser pipe respectively through bolts.

[0013] Further, a sealing gasket is inlaid on the surface of the flange plate.

[0014] Further, the outer diameter of the sealing ball is larger than the inner diameter of the first ring plate.

[0015] Further, one end of the spring is connected to the sealing ball, and the other end of the spring is connected to the second ring plate.

[0016] Further, a return air cap is fixedly connected to the bent part of the riser pipe close to the return slide, and the return air cap is arranged in an arc structure.

[0017] Further, the axis lines of the first ring plate and the second ring plate are located on the same straight line.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the advantages of the present utility model are as follows:

[0020] (1) In this solution, the separated material is introduced into the inner side of the connecting cylinder through the cyclone separator, and the inner side of the connecting cylinder is divided into a continuously S-shaped channel by the partition plate, so that the flow rate of the material in the connecting cylinder can be effectively reduced. At the same time, the inclined surface provided at the partition plate is used to guide the material, and under the action of air pressure, the sealing ball is pushed open and the spring is compressed and deformed, which can further reduce the speed of the material entering the riser pipe, thereby effectively reducing the wear of the return slide caused by the impact of the material, prolonging the service life of the return slide, and reducing the cost of replacing the entire riser pipe.

[0021] (2) In this solution, the sealing gasket ensures the sealing performance of the connection part of the connecting cylinder, and when the partition plate is severely worn, the connecting cylinder is conveniently replaced by means of flange connection, reducing the cost of replacing the entire riser pipe. Description of the drawings

[0022] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0023] Figure 2 is a side view schematic diagram of the riser pipe and the connecting cylinder of the present utility model;

[0024] Figure 3 is a sectional view of the A-A part of the riser pipe and the connecting cylinder of the present utility model;

[0025] Figure 4 is an enlarged schematic diagram of part A of the present utility model;

[0026] Figure 5 is an external structural schematic diagram of the connecting cylinder of the present utility model.

[0027] Explanation of the reference numerals in the drawings:

[0028] Cyclone separator; 2, riser pipe; 3, connecting cylinder; 4, partition plate; 5, return slide; 6, return air cap; 7, first ring plate; 8, second ring plate; 9, sealing ball; 10, spring; 11, guide block; 12, chute; 13, flange plate; 14, sealing gasket. Detailed implementation manners

[0029] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0030] Embodiment:

[0031] Please refer to Figures 1-5 , a return feeder of a circulating fluidized bed, including a cyclone separator 1 and a riser 2 installed below the cyclone separator 1. A connecting cylinder 3 is installed between the cyclone separator 1 and the riser 2. A partition 4 is fixedly connected to the inner side of the connecting cylinder 3. A plurality of partitions 4 are equidistantly arranged in the axial position of the connecting cylinder 3, and adjacent two partitions 4 are arranged staggeredly. The top of the partition 4 is provided with an inclined surface;

[0032] One end of the riser 2 close to the connecting cylinder 3 is fixedly connected with a first ring plate 7 and a second ring plate 8 from top to bottom. A sealing ball 9 is installed between the first ring plate 7 and the second ring plate 8, and the sealing ball 9 abuts against the bottom opening of the first ring plate 7. A spring 10 is installed between the sealing ball 9 and the second ring plate 8. Guide blocks 11 are symmetrically installed on the outer wall of the sealing ball 9, and a sliding groove 12 is opened on the inner wall of the riser 2 and is slidably connected to the end of the guide block 11;

[0033] A return slide plate 5 is fixedly connected to the bent part of the riser 2 close to the connecting cylinder 3;

[0034] It should be noted that when the return feeder of the circulating fluidized bed is in use, the separated material is introduced into the inner side of the connecting cylinder 3 through the cyclone separator 1. The inner side of the connecting cylinder 3 is separated into a continuous S-shaped channel by the partition 4, so as to effectively reduce the flow rate of the material in the connecting cylinder 3. At the same time, the inclined surface provided at the partition 4 is used to guide the material, and under the action of air pressure, the sealing ball 9 is pushed open and the spring 10 is compressed and deformed, which can further reduce the speed of the material entering the riser 2, thereby effectively reducing the wear of the return slide plate 5 caused by the impact of the material, prolonging the service life of the return slide plate 5, and reducing the cost of replacing the whole riser 2;

[0035] When the cyclone separator 1 stops working, the elastic force of the spring 10 is used to make the guide block 11 cooperate with the sliding groove 12 to slide, so that the sealing ball 9 seals the first ring plate 7, thereby preventing the material from continuously entering the inner side of the riser 2 and causing blockage.

[0036] Such as Figure 1 , Figure 5As shown, both ends of the connecting tube 3 are fixedly connected with flanges 13, and the flanges 13 are fixedly connected to the cyclone separator 1 and the standpipe 2 respectively by bolts, and the surface of the flanges 13 is inlaid with sealing gaskets 14;

[0037] It should be noted that the sealing gasket 14 ensures the sealing of the connection part of the connecting tube 3 , and the flange connection makes it easy to replace the connecting tube 3 , thereby reducing the cost of replacing the entire standpipe 2 .

[0038] like Figure 4 As shown, the outer diameter of the sealing ball 9 is larger than the inner diameter of the first ring plate 7, one end of the spring 10 is connected to the sealing ball 9, and the other end of the spring 10 is connected to the second ring plate 8, and the axis of the first ring plate 7 and the second ring plate 8 are located on the same straight line;

[0039] It should be noted that when the cyclone separator 1 stops working, the elastic force of the spring 10 is used to make the guide block 11 slide in cooperation with the slide groove 12, so that the sealing ball 9 blocks the first ring plate 7, thereby preventing materials from continuously entering the inner side of the riser 2 and causing blockage.

[0040] like Figure 4 As shown, a return material hood 6 is fixedly connected to the bending portion of the vertical pipe 2 near the return material slide plate 5, and the return material hood 6 is arranged in an arc-shaped structure;

[0041] It should be noted that, by providing the return hood 6, the material has a good guiding effect at the bending part of the vertical pipe 2, which is beneficial to the return of the material.

[0042] When in use: the separated material is introduced into the inner side of the connecting tube 3 through the cyclone separator 1, and the inner side of the connecting tube 3 is divided into a continuous S-shaped channel through the partition 4, so that the flow speed of the material in the connecting tube 3 can be effectively reduced, and the inclined surface set at the partition 4 is used to guide the material, and under the action of air pressure, the sealing ball 9 is opened and the spring 10 is compressed and deformed, which can further reduce the speed of the material entering the vertical pipe 2, and then effectively reduce the wear of the material return slide plate 5 caused by the impact, extend the service life of the return slide plate 5, and reduce the cost of replacing the vertical pipe 2 as a whole;

[0043] When the cyclone separator 1 stops working, the elastic force of the spring 10 is used to make the guide block 11 slide with the slide groove 12, so that the sealing ball 9 blocks the first ring plate 7, thereby preventing materials from continuously entering the inner side of the vertical pipe 2 and causing blockage.

[0044] The above are only the preferred specific embodiments of the present utility model; however, the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, making equivalent substitutions or changes according to the technical solution of the present utility model and its improved conceptions, shall be covered by the protection scope of the present utility model.

Claims

1. A return feeder for a circulating fluidized bed, comprising a cyclone separator (1) and a riser (2) installed below the cyclone separator (1), characterized in that: A connecting cylinder (3) is installed between the cyclone separator (1) and the riser (2). A partition plate (4) is fixedly connected to the inner side of the connecting cylinder (3). A plurality of the partition plates (4) are equidistantly arranged in the axial position of the connecting cylinder (3), and two adjacent partition plates (4) are staggered. A slope is arranged at the top of the partition plate (4). One end of the riser (2) close to the connecting cylinder (3) is fixedly connected with a first ring plate (7) and a second ring plate (8) from top to bottom. A sealing ball (9) is installed between the first ring plate (7) and the second ring plate (8). The sealing ball (9) abuts against the bottom opening of the first ring plate (7). A spring (10) is installed between the sealing ball (9) and the second ring plate (8). Guide blocks (11) are symmetrically installed on the outer wall of the sealing ball (9). A chute (12) for sliding connection with the end of the guide block (11) is formed on the inner wall of the riser (2). A return material slide plate (5) is fixedly connected to the bent part of the riser (2) close to the connecting cylinder (3).

2. The loop seal of a circulating fluidized bed according to claim 1, characterized in that: Flange plates (13) are fixedly connected to both ends of the connecting cylinder (3), and the flange plates (13) are fixedly connected to the cyclone separator (1) and the riser (2) respectively by bolts.

3. The return feeder of a circulating fluidized bed according to claim 2, characterized in that: Sealing washers (14) are inlaid on the surface of the flange plates (13).

4. A loop seal of a circulating fluidized bed according to claim 1, wherein: The outer diameter of the sealing ball (9) is larger than the inner diameter of the first ring plate (7).

5. A return feeder of a circulating fluidized bed according to claim 1, characterized in that: One end of the spring (10) is connected to the sealing ball (9), and the other end of the spring (10) is connected to the second ring plate (8).

6. The loop seal of a circulating fluidized bed according to claim 1, characterized in that: A return material air cap (6) is fixedly connected to the bent part of the riser (2) close to the return material slide plate (5), and the return material air cap (6) is arranged in an arc structure.

7. A return feeder for a circulating fluidized bed according to claim 1, characterized in that: The axis lines of the first ring plate (7) and the second ring plate (8) are located on the same straight line.

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