Bag-type dust collector of circulating fluidized bed boiler

Abstract

The utility model discloses a circulating fluidized bed boiler bag-type dust remover, which relates to the technical field of dust removers and comprises a dust remover body, an air inlet pipe penetrates through the bottom of the front surface of the dust remover body, a water receiving pipe penetrates through the bottom end of the air inlet pipe, a water storage box is sleeved at the bottom end of the water receiving pipe, a water inlet pipe penetrates through one side wall of the water storage box, and a water outlet pipe penetrates through the other side wall of the water storage box. The middle of the air inlet pipe is covered with a cover cylinder, an annular pipe is embedded in the inner side of the cover cylinder, the top end of the annular pipe is fixedly connected with a circulating pipe, a plurality of cloth bags are installed in the dust remover body, and vertical plates are arranged on the two sides of each cloth bag. By arranging a series of structures, the probability that condensed water drops are mixed with particles on the surface of the cloth bag is reduced, the probability that micropores on the surface of the dust collection cloth bag are blocked is reduced, the particles on the surface of the cloth bag can be quickly separated from the cloth bag after being collided, and therefore the dust removal effect of the dust collection cloth bag can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dust collectors, in particular to a bag dust collector for a circulating fluidized bed boiler. Background Art

[0002] Like traditional boilers, circulating fluidized bed boilers also generate a large amount of smoke and dust during operation. If these smoke and dust are not treated by dust collectors and are directly discharged into the atmosphere, the particulate matter in the flue gas will cause serious pollution to the environment. Therefore, it is necessary to use equipment such as bag dust collectors to separate the particulate matter in the flue gas to reduce the pollution of the particulate matter in the flue gas to the environment.

[0003] However, when using the existing circulating fluidized bed boiler bag dust collector, high-temperature flue gas is usually directly introduced into the interior of the dust collector. Since the high-temperature flue gas also contains a large amount of water vapor, when the water vapor enters the interior of the dust collector and reaches the dew point temperature, it is easy to condense water droplets on the surface of the bag. The water droplets mix with the dust particles, which can easily cause the micropores on the surface of the bag to be blocked. In addition, when cleaning the dust on the surface of the bag, high-speed air flow backblowing is usually used to blow off the dust and other particles adsorbed on the surface of the bag. When the air flow velocity is too low, the particles on the surface of the bag are difficult to be blown off, resulting in poor cleaning effect. Utility Model Content

[0004] The purpose of the utility model is to provide a circulating fluidized bed boiler bag dust collector to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a circulating fluidized bed boiler bag dust collector, comprising a dust collector body, an air inlet pipe passing through the bottom of the front of the dust collector body, a water receiving pipe passing through the bottom end of the air inlet pipe, a water storage box sleeved on the bottom end of the water receiving pipe, a water inlet pipe passing through a side wall of the water storage box, a cover tube covering the middle of the air inlet pipe, an annular tube embedded in the inner side of the cover tube, a circulation pipe fixedly connected to the top end of the annular tube, and a plurality of bags installed inside the dust collector body;

[0006] Both sides of the cloth bag are provided with vertical plates, the side walls of the vertical plates are provided with swinging plates, the top of the swinging plates are fixedly connected to a small ball, a back-blowing pipe is installed on the top of the cloth bag, an air pump is fixedly installed on one end of the back-blowing pipe, an air outlet pipe passes through the other side wall of the dust collector body, a fan is installed on the bottom end of the air outlet pipe, and the bottom end of the dust collector body is fixedly connected to an ash hopper.

[0007] Preferably, a filter is engaged with the inner wall of the water storage box, and the filter is located at the bottom of the water receiving pipe.

[0008] Preferably, a circulation pump is fixedly installed on one side of the water storage box, an input end of the circulation pump is fixedly connected to a return pipe, and the return pipe is connected through the water storage box.

[0009] Preferably, the output end of the circulation pump is fixedly connected to the bottom end of the circulation pipe, and the water storage box is communicated with the circulation pipe and the interior of the annular pipe through the circulation pump.

[0010] Preferably, the bottom end of the annular tube is fixedly connected with a water outlet pipe, and the water outlet pipe is connected through the cover tube.

[0011] Preferably, the vertical plate is fixedly connected to the bottom end of a flower plate fixedly provided inside the dust collector body, and the vertical plate is movably connected to the cloth bag through the flower plate.

[0012] Preferably, the bottom end of the swing plate is fixedly connected to the vertical plate, and the ball is movably connected to the cloth bag through the vertical plate.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. This circulating fluidized bed boiler bag dust collector uses a water storage box, water pipe, circulation pipe and annular pipe to condense and liquefy the high-temperature water vapor contained in the flue gas in advance in the air inlet pipe before it enters the bag dust collector. This reduces the probability of water vapor condensing on the surface of the bags in the dust collector, thereby reducing the probability of water droplets mixing with particulate matter on the bag surface after condensation and reducing the probability of micropores on the dust bag surface being blocked.

[0015] 2. This circulating fluidized bed boiler bag dust collector uses vertical plates, swing plates and small balls to ensure that when the airflow is back-blowing the dust bags for cleaning, the airflow passing through the bags can blow toward the vertical plates on both sides, driving the small balls on the vertical plates to shake, so that the small balls collide with the bag surface under the action of the swing plates, so that the particles on the bag surface can quickly detach from the bag after the collision, thereby improving the cleaning effect of the dust bags. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the water receiving pipe and annular pipe structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the vertical plate and ball structure of the utility model;

[0019] Figure 4 This is a structural diagram of the swing plate and water storage box of the utility model.

[0020] In the figure: 1. Water storage box; 2. Water inlet pipe; 3. Air inlet pipe; 4. Return pipe; 5. Circulation pump; 6. Circulation pipe; 7. Water outlet pipe; 8. Cover tube; 9. Dust collector body; 10. Air pump; 11. Air outlet pipe; 12. Fan; 13. Backflush pipe; 14. Bag; 15. Vertical plate; 16. Swing piece; 17. Small ball; 18. Ash hopper; 19. Ring pipe; 20. Water connecting pipe; 21. Filter. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0024] like Figures 1 to 4 As shown, the circulating fluidized bed boiler bag dust collector of this embodiment includes a dust collector body 9. An air inlet pipe 3 is passed through the bottom of the front of the dust collector body 9. A water receiving pipe 20 is passed through the bottom end of the air inlet pipe 3. A water storage box 1 is sleeved on the bottom end of the water receiving pipe 20. A water inlet pipe 2 is passed through a side wall of the water storage box 1. A cover tube 8 is provided in the middle of the air inlet pipe 3. An annular pipe 19 is embedded in the inner side of the cover tube 8. The top end of the annular pipe 19 is fixedly connected to the circulation pipe 6. A plurality of bags 14 are installed inside the dust collector body 9.

[0025] There are vertical plates 15 on both sides of the cloth bag 14, and the side walls of the vertical plates 15 are provided with swinging plates 16. The top of the swinging plates 16 is fixedly connected to a small ball 17. A back-blowing pipe 13 is installed on the top of the cloth bag 14, and an air pump 10 is fixedly installed on one end of the back-blowing pipe 13. An air outlet pipe 11 passes through the other side wall of the dust collector body 9, and a fan 12 is installed at the bottom end of the air outlet pipe 11. The bottom end of the dust collector body 9 is fixedly connected to an ash hopper 18.

[0026] Specifically, the dust collector body 9 also includes electrical components required for the normal operation of the bag 14 dust collector. The air inlet pipe 3 is connected to the exhaust pipe of the circulating fluidized bed boiler, so that the flue gas can directly enter the dust collector body 9 through the air inlet pipe 3. The function of the water receiving pipe 20 is to allow the liquid water condensed in the middle section of the air inlet pipe 3 to flow into the water storage box 1, avoiding the accumulation of condensed water inside the air inlet pipe 3, and at the same time helping to flush the particulate matter attached to the inner wall of the air inlet pipe 3 to the pipe mouth of the air inlet pipe 3. The function of the water storage box 1 is to collect the condensed water flowing into the water receiving pipe 20, thereby facilitating the subsequent utilization of the condensed water. The function of the water inlet pipe 2 is to pass low-temperature water into the water storage box 1, so that the low-temperature water can be transported to the annular pipe 19 to cool the middle section of the air inlet pipe 3, thereby To achieve early condensation of water vapor in the boiler flue gas, reduce the probability of water vapor condensing on the surface of the bag 14 and mixing with particulate matter to cause blockage of the bag 14, the function of the cover tube 8 is to protect the annular tube 19, the function of the circulation pipe 6 is to allow the mixed water formed by the condensed water and the low-temperature water to continuously enter the annular tube 19, the function of the vertical plate 15 is to isolate the adjacent bags 14 to avoid adhesion between the bags 14 and 14, and at the same time facilitate the back-blowing airflow to flow in a smaller space, thereby facilitating the flow rate of the airflow and enhancing the back-blowing effect, the swinging piece 16 is composed of a high-temperature resistant spring sheet with good deformation ability, the small ball 17 is made of a high-temperature resistant non-metallic material and has a smooth surface. When colliding with the bag 14, it will not cause irreversible damage to the surface of the bag 14.

[0027] Furthermore, a filter screen 21 is engaged with the inner wall of the water storage box 1, and the filter screen 21 is located at the bottom of the water receiving pipe 20. The function of the filter screen 21 is to intercept particulate matter that flows into the water storage box 1 with the condensed water, so that the particulate matter is not easy to enter the water storage box 1 and circulate with the water flow, thereby reducing damage to the circulation pump 5 and the pipeline.

[0028] Furthermore, a circulation pump 5 is fixedly installed on one side of the water storage box 1, and the input end of the circulation pump 5 is fixedly connected to a return pipe 4, which is connected through the water storage box 1. The circulation pump 5 can deliver condensed water and low-temperature water into the annular pipe 19 in time, thereby realizing the recycling of condensed water.

[0029] Furthermore, the output end of the circulation pump 5 is fixedly connected to the bottom end of the circulation pipe 6, and the water storage box 1 is communicated with the circulation pipe 6 and the interior of the annular pipe 19 through the circulation pump 5. The circulation pump 5 can flow water into the circulation pipe 6, thereby realizing the flow of water into the annular pipe 19.

[0030] Furthermore, the bottom end of the annular tube 19 is fixedly connected to a water outlet pipe 7, which is connected through the cover tube 8. The function of the water outlet pipe 7 is to discharge the low-temperature water and condensed water after absorbing heat through heat exchange from the annular tube 19, so as to enable subsequent entry of low-temperature water and condensed water. At the same time, the high-temperature water discharged from the water outlet pipe 7 can be returned to the boiler for reuse, which is more energy-saving and environmentally friendly.

[0031] Furthermore, the vertical plate 15 is fixedly connected to the bottom end of the flower plate fixedly provided inside the dust collector body 9, and the vertical plate 15 is movably connected to the cloth bag 14 through the flower plate. The vertical plate 15 can separate the cloth bag 14 and at the same time can reduce the activity space of the airflow, so that the flow rate of the airflow becomes faster, which is more conducive to the airflow driving the small ball 17 and the swinging piece 16 to swing on both sides of the cloth bag 14.

[0032] Furthermore, the bottom end of the swinging piece 16 is fixedly connected to the vertical plate 15, and the ball 17 is movably connected to the cloth bag 14 through the vertical plate 15. After being impacted by the airflow, the ball 17 collides with the cloth bag 14 by swinging, so that the particulate matter adsorbed on the surface of the cloth bag 14 can be shaken off due to the collision, thereby improving the cleaning effect of the cloth bag 14.

[0033] The method of using this embodiment is as follows: before using the bag dust collector 14 of the circulating fluidized bed boiler, it is necessary to first connect the dust collector to an external power supply, and at the same time connect the air inlet pipe 3 and the water outlet pipe 7 to the corresponding pipes on the circulating fluidized bed boiler respectively, and then introduce low-temperature water into the water inlet pipe 2, so that the low-temperature water enters the water storage box 1, and then enters the return water pipe 4 through the water storage box 1, and then under the action of the circulating pump 5, the low-temperature water will enter the circulation pipe 6, and then enter the annular pipe 19, so that the temperature inside the cover tube 8 becomes lower, and then the flue gas introduced into the air inlet pipe 3 will be cooled when it flows to the middle section of the air inlet pipe 3, and condensed water will be formed on the inner wall of the middle section of the air inlet pipe 3, and then flow along the inner wall of the air inlet pipe 3 to the water receiving pipe 20 at the bottom, and then the condensed water in the water receiving pipe 20 will enter the storage The flue gas in the water box 1 is mixed with low-temperature water. At the same time, the particulate matter entering the water storage box 1 with the condensed water will be intercepted by the filter screen 21. Then the cooled flue gas will pass through the cloth bag 14 and be discharged from the outlet pipe 11 to the outside of the dust collector body 9. When it is necessary to clean the cloth bag 14 in the dust collector body 9, the backflush pipe 13 will pass a high-speed airflow and blow it into the inside of the cloth bag 14, causing the cloth bag 14 to expand. At the same time, the airflow passing through the cloth bag 14 will encounter the vertical plate 15 and flow back and forth between the vertical plates 15, driving the small ball 17 on the vertical plate 15 to swing left and right through the swing plate 16. The small ball 17 will collide with the surface of the inflated cloth bag 14 during the swinging process, so that the particulate matter attached to the surface of the cloth bag 14 can be quickly shaken off into the ash hopper 18 due to the collision, thus completing the cleaning step of the dust collector body 9.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A circulating fluidized bed boiler bag filter, comprising a filter body (9), characterized in that: An air inlet pipe (3) is passed through the bottom of the front side of the dust collector body (9), a water receiving pipe (20) is passed through the bottom end of the air inlet pipe (3), a water storage box (1) is sleeved on the bottom end of the water receiving pipe (20), a water inlet pipe (2) is passed through a side wall of the water storage box (1), a cover tube (8) is provided in the middle of the air inlet pipe (3), an annular pipe (19) is embedded in the inner side of the cover tube (8), a circulation pipe (6) is fixedly connected to the top end of the annular pipe (19), and a plurality of cloth bags (14) are installed inside the dust collector body (9); Both sides of the bag (14) are provided with vertical plates (15), and the side walls of the vertical plates (15) are provided with swinging plates (16), and the top of the swinging plates (16) is fixedly connected to a small ball (17). A back-blowing pipe (13) is installed on the top of the bag (14), and an air pump (10) is fixedly installed on one end of the back-blowing pipe (13). An air outlet pipe (11) passes through the other side wall of the dust collector body (9), and a fan (12) is installed at the bottom end of the air outlet pipe (11). The bottom end of the dust collector body (9) is fixedly connected to an ash hopper (18).

2. The circulating fluidized bed boiler bag filter according to claim 1, characterized in that: A filter screen (21) is engaged with the inner wall of the water storage box (1), and the filter screen (21) is located at the bottom of the water receiving pipe (20).

3. The circulating fluidized bed boiler bag filter according to claim 1, characterized in that: A circulation pump (5) is fixedly installed on one side of the water storage box (1), and a return water pipe (4) is fixedly connected to the input end of the circulation pump (5), and the return water pipe (4) is connected to the water storage box (1) through.

4. The circulating fluidized bed boiler bag filter according to claim 3, characterized in that: The output end of the circulation pump (5) is fixedly connected to the bottom end of the circulation pipe (6), and the water storage box (1) is communicated with the circulation pipe (6) and the interior of the annular pipe (19) through the circulation pump (5).

5. The circulating fluidized bed boiler bag filter according to claim 1, characterized in that: The bottom end of the annular tube (19) is fixedly connected to a water outlet pipe (7), and the water outlet pipe (7) is connected through the cover tube (8).

6. The circulating fluidized bed boiler bag filter according to claim 1, characterized in that: The vertical plate (15) is fixedly connected to the bottom end of a flower plate fixedly provided inside the dust collector body (9), and the vertical plate (15) is movably connected to the cloth bag (14) through the flower plate.

7. The circulating fluidized bed boiler bag filter according to claim 1, characterized in that: The bottom end of the swing plate (16) is fixedly connected to the vertical plate (15), and the small ball (17) is movably connected to the cloth bag (14) through the vertical plate (15).

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