Boiler tail gas efficient treatment device and treatment method thereof

Abstract

The present application relates to the technical field of boiler tail gas treatment, and discloses a boiler tail gas efficient treatment device and a treatment method thereof, which comprises a filtering assembly for primary dust removal of original boiler tail gas; a limiting assembly is arranged on one side of the filtering assembly, a spray tower is arranged on one side of the limiting assembly, and the spray tower is used for desulfurization treatment of the boiler tail gas; the filtering assembly comprises a fixing frame; original boiler tail gas enters a first connecting pipe through a boiler tail gas outlet pipe; after the tail gas enters the fixing frame, the tail gas flows through the filter screen fixed in the insertion groove through the limiting ring to complete primary dust removal, so that the cleanliness of the discharged tail gas is ensured; the remaining filter screens are in a standby state; the fixing frame can rotate relative to the support frame around the bearing, so that the used filter screen is turned out of the airflow channel, the standby filter screen is turned into the working position, online replacement of the filter screen under non-stop state is realized, and the maintenance downtime and operation and maintenance cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of boiler exhaust gas treatment technology, specifically to a high-efficiency boiler exhaust gas treatment device and its treatment method. Background Technology

[0002] Boilers are indispensable thermal energy equipment in industrial production and residential heating. During the combustion process, they produce a large amount of exhaust gas containing dust, particulate matter and harmful gases. If the exhaust gas is discharged directly without effective treatment, it will cause serious pollution to the atmospheric environment and endanger human health.

[0003] Boiler exhaust gas treatment systems typically employ filtration devices to remove dust and purify the exhaust gas. Existing filtration devices mostly use fixed filter screen structures. When the filter screen becomes clogged, damaged, or its filtration efficiency decreases due to long-term use, the system needs to be shut down before the filter screen can be disassembled and replaced. At the same time, the filter screen replacement operation of traditional filtration devices is relatively cumbersome, requiring the use of special tools to loosen, rotate, and re-tighten multiple components, which is inconvenient. Therefore, a high-efficiency boiler exhaust gas treatment device and its treatment method are proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a high-efficiency boiler exhaust gas treatment device and method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency boiler exhaust gas treatment device, comprising a filter assembly, wherein the filter assembly is used for primary dust removal of the raw boiler exhaust gas;

[0006] The filter assembly is provided with a limiting component on one side, and a spray tower is provided on one side of the limiting component. The spray tower is used for desulfurization treatment of boiler exhaust gas.

[0007] The filter assembly includes a fixing frame, and a plurality of insertion slots are provided on one side of the fixing frame. A limit ring is connected to the inner side of the insertion slot by bolts, and a filter screen is installed inside the limit ring.

[0008] The outer side of the fixed frame is rotatably connected to the support frame via a bearing, and a first connecting pipe and a second connecting pipe are fixed on both sides of the support frame respectively;

[0009] The limiting component includes a connecting frame, a sliding groove is provided on the inner side of the connecting frame, a sliding plate is slidably connected to the inner side of the sliding groove, a connecting rod is fixed to one side of the sliding plate, and a ball is ball-connected to one end of the connecting rod;

[0010] The fixing frame has several limiting grooves on one side, and the limiting grooves are located outside the insertion groove.

[0011] Preferably, a sealing end is bonded to one side of the back of the limiting ring, and the sealing end is used to seal the gap between the limiting ring and the insertion groove.

[0012] Preferably, a handle is fixed to the outside of the fixing frame, and the connecting frame is fixed to the top of the first connecting tube.

[0013] Preferably, when the connecting rod is inserted into the inner side of the limiting groove, the fixing frame is in a fixed state, and when the connecting rod leaves the inner side of the limiting groove, the fixing frame is in a rotating state.

[0014] Preferably, a pull rod is fixed to the end of the slide away from the connecting rod, and a spring is sleeved on the outside of the pull rod.

[0015] Preferably, the open end of the connecting frame is bolted to a cover plate, the two ends of the spring are respectively connected to one side of the cover plate and the slide plate, the pull rod moves through one side of the cover plate, and the ball is rotatably connected to one side of the fixed frame.

[0016] Preferably, a sealing ring is installed at one end of both the first connecting pipe and the second connecting pipe, and the sealing ring is used to seal the gap between the first connecting pipe, the second connecting pipe and the fixing frame.

[0017] Preferably, a liquid storage tank is provided on the outer side of the bottom of the spray tower, a circulation pump is installed on the inner side of the liquid storage tank, and an outlet pipe connected to the outlet end of the circulation pump is fixed on the top of the liquid storage tank.

[0018] A demister is fixed to the top of the inner wall of the spray tower, and an exhaust end is provided at the top of the spray tower.

[0019] Preferably, a packing layer is installed inside the spray tower, and a spray pipe located above the packing layer is fixed on the inner wall of the spray tower, with the inlet end of the spray pipe connected to the outlet end of the outlet pipe.

[0020] The bottom of the spray tower is equipped with a slurry pool. The air inlet end of the second connecting pipe is connected to the air outlet end of the filter screen, and the air outlet end of the second connecting pipe is connected to the air inlet end of the spray tower.

[0021] The present invention also provides a method for treating boiler exhaust gas using a high-efficiency treatment device, comprising the following steps:

[0022] S1, Primary dust removal stage: The original exhaust gas from the boiler is introduced into the first connecting pipe, so that the exhaust gas enters the filter component at a flow rate of 8-15 m / s. The exhaust gas flows through the filter screen and intercepts dust particles with a diameter greater than 5μm, so that the dust concentration is reduced from the initial 2000-5000 mg / m³ to below 50 mg / m³.

[0023] S2, Filter Screen 12 Switching Stage: When the filter screen that is processing boiler exhaust gas needs to be cleaned, pull the lever in the corresponding limiting component to make the ball at the end of the connecting rod disengage from the limiting groove on the fixed frame, and the fixed frame changes from a fixed state to a rotatable state; rotate the fixed frame by the handle to align the new filter screen with the airflow channel, then release the lever and use the spring force to push the ball into the adjacent limiting groove to complete the switching;

[0024] S3, Wet Desulfurization Stage: The exhaust gas after dust removal enters from the bottom of the spray tower through the second connecting pipe and flows upward at an empty tower gas velocity of 1.0-2.5 m / s; the alkaline absorption slurry in the storage tank is sent to the spray pipe through the circulating pump and the outlet pipe, and is atomized into 1500-2500 μm droplets and sprayed downward through the nozzles; in the packing layer, the gas and liquid phases come into contact, sulfur dioxide is absorbed, and the pH value of the slurry is controlled at 5.5-6.5 and the liquid-to-gas ratio is 8-15 L / m³. 3 ;

[0025] S4. Demisting and Discharge Stage: The clean exhaust gas after desulfurization flows upward through the demister to remove entrained droplets with a diameter greater than 10μm. Finally, the gas with a water content of less than 75 mg / m³ is discharged into the atmosphere from the exhaust end.

[0026] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects:

[0027] 1. The boiler's raw exhaust gas enters the first connecting pipe through the boiler exhaust gas outlet pipe. After entering the fixed frame, the exhaust gas flows through the filter screen fixed inside the insertion slot by the limiting ring, completing the primary dust removal and ensuring the cleanliness of the discharged exhaust gas. The remaining filter screens are in standby mode. The fixed frame can rotate relative to the support frame around the bearing, thereby turning the used filter screen out of the airflow channel and turning the standby filter screen into the working position. This realizes online replacement of filter screens without stopping the machine, which greatly improves the continuity and efficiency of boiler exhaust gas treatment and reduces maintenance downtime and operation and maintenance costs.

[0028] 2. When it is necessary to switch the filter screen, the operator only needs to pull the lever inward. The lever drives the slide plate to slide inward in the groove of the connecting frame. The spring is further compressed, and the ball at the end of the connecting rod disengages from the limiting groove. The fixed frame then changes from a fixed state to a rotatable state. After rotating to the correct position, the lever is released, and the spring force quickly pushes the slide plate back to its original position. The ball automatically rolls into the adjacent limiting groove under the push of the spring, completing the switching and locking of the filter screen. The operation is simple and convenient.

[0029] Third, the clean exhaust gas after dust removal by the filter components enters from the inlet end of the second connecting pipe and is introduced from the bottom of the spray tower through the outlet end of the second connecting pipe. The circulating pump pressurizes and delivers the alkaline absorption slurry in the storage tank to the outlet pipe, and then sends it into the interior of the spray tower. The alkaline absorption slurry is atomized and sprayed downwards through the nozzles on the spray pipe, forming a countercurrent contact with the exhaust gas flowing from bottom to top. The countercurrent contact method keeps the concentration difference between the exhaust gas and the alkaline absorption slurry at a high level, improves the mass transfer driving force, and thus significantly improves the SO2 absorption efficiency and desulfurization effect, ensuring that the exhaust gas emissions meet the standards. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a first-view structural diagram of the present invention;

[0032] Figure 2 This is a schematic diagram of the second perspective structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the filter screen position structure of the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of the fixing frame of the present invention;

[0035] Figure 5 This is a schematic diagram of the main cross-sectional structure of the connecting pipe of the present invention;

[0036] Figure 6 This is a schematic diagram of the main cross-sectional structure of the connecting frame of the present invention;

[0037] Figure 7 This is a schematic diagram of the main cross-sectional structure of the spray tower of the present invention.

[0038] Explanation of reference numerals in the attached drawings: 1. Filter assembly; 11. Fixing frame; 12. Filter screen; 13. Limiting ring; 14. Insertion groove; 15. Handle; 2. Limiting assembly; 21. Connecting frame; 22. Limiting groove; 23. Cover plate; 24. Slide plate; 25. Sphere; 26. Connecting rod; 27. Spring; 28. Pull rod; 3. First connecting pipe; 4. Second connecting pipe; 5. Liquid storage tank; 6. Spray tower; 61. Exhaust end; 62. Liquid outlet pipe; 63. Demister; 64. Packing layer; 65. Slurry pool; 66. Spray pipe; 7. Support frame. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0041] Example

[0042] Please see Figure 1-7 The present invention provides a technical solution: a high-efficiency boiler exhaust gas treatment device, including a filter component 1, which is used to perform primary dust removal on the original boiler exhaust gas; a limiting component 2 is provided on one side of the filter component 1, and a spray tower 6 is provided on one side of the limiting component 2, which is used to desulfurize the boiler exhaust gas.

[0043] The filter assembly 1 includes a mounting frame 11. Several insertion slots 14 are formed on one side of the mounting frame 11. A limiting ring 13 is bolted to the inside of each insertion slot 14. A sealing gasket is adhered to the back of the limiting ring 13 to seal the gap between the limiting ring 13 and the insertion slot 14. A filter screen 12 is installed inside the limiting ring 13. The filter screen 12 intercepts dust particles larger than 5 μm, reducing the dust concentration from an initial 2000-5000 mg / m³ to below 50 mg / m³, thus completing primary dust removal. The exhaust gas passes through the filter screen 12 at a flow rate of 8-15 m / s. A handle 15 is fixed to the outside of the mounting frame 11, and a connecting frame 21 is fixed to the top of the first connecting pipe 3.

[0044] A support frame 7 is rotatably connected to the outside of the fixed frame 11 via a bearing. A first connecting pipe 3 and a second connecting pipe 4 are fixed on both sides of the support frame 7 respectively. The first connecting pipe 3 is connected to the boiler exhaust gas outlet pipe. A sealing ring is installed at one end of the first connecting pipe 3 and the second connecting pipe 4. The sealing ring is used to seal the gap between the first connecting pipe 3, the second connecting pipe 4 and the fixed frame 11.

[0045] The limiting component 2 includes a connecting frame 21. A sliding groove is provided on the inner side of the connecting frame 21, and a sliding plate 24 is slidably connected to the inner side of the sliding groove. A connecting rod 26 is fixed to one side of the sliding plate 24, and a ball 25 is ball-jointed to one end of the connecting rod 26. The ball 25 is connected to the end of the connecting rod 26 by ball joint, so that it can rotate freely within a certain angle range, which facilitates smooth insertion or removal from the limiting groove 22. A number of limiting grooves 22 are provided on one side of the fixing frame 11. The limiting grooves 22 are located outside the insertion groove 14. When the connecting rod 26 is inserted into the inner side of the limiting groove 22, the fixing frame 11 is in a fixed state. When the connecting rod 26 leaves the inner side of the limiting groove 22, the fixing frame 11 is in a rotating state. Under normal working conditions, the spring 27 is in a compressed state, and its elastic force continuously pushes the sliding plate 24 to move outward, thereby pushing the ball 25 at the end of the connecting rod 26 to be tightly embedded in the limiting groove 22, realizing the automatic locking of the fixing frame 11 without the need for an additional locking device.

[0046] A pull rod 28 is fixed to the end of the slide plate 24 away from the connecting rod 26. A spring 27 is sleeved on the outside of the pull rod 28. The limiting groove 22 is located outside the insertion groove 14, and the number of them corresponds one-to-one with the number of filter screens 12. When the connecting rod 26 is inserted into the inner side of the corresponding limiting groove 22, the ball 25 is stuck into the limiting groove 22, and the fixing frame 11 is in a fixed state and cannot rotate around the bearing. At this time, the corresponding filter screen 12 is aligned with the airflow channel and is in working state. When the connecting rod 26 leaves the inner side of the limiting groove 22, the fixing frame 11 is in a rotating state, and the filter screen 12 can be switched by rotating the handle 15.

[0047] The open end of the connecting frame 21 is connected to the cover plate 23 by bolts. The two ends of the spring 27 are respectively connected to one side of the cover plate 23 and the slide plate 24. When the spring 27 needs maintenance, it is only necessary to remove the bolt on one side of the cover plate 23 and then remove the spring 27 sleeved on the outside of the pull rod 28 for replacement. The pull rod 28 moves through one side of the cover plate 23, and the ball 25 is rotatably connected to one side of the fixed frame 11.

[0048] A liquid storage tank 5 is provided on the outer side of the bottom of the spray tower 6. A circulation pump is installed inside the liquid storage tank 5. A liquid outlet pipe 62 connected to the liquid outlet end of the circulation pump is fixed on the top of the liquid storage tank 5. The circulation pump pressurizes and delivers the alkaline absorption slurry in the liquid storage tank 5 to the liquid outlet pipe 62, and then sends it into the interior of the spray tower 6 through the liquid outlet pipe 62.

[0049] A demister 63 is fixed to the top of the inner wall of the spray tower 6. The clean exhaust gas after the desulfurization reaction continues to flow upward and passes through the demister 63 fixed to the top of the inner wall of the spray tower 6. The demister 63 adopts a folded plate or wire mesh structure. An exhaust end 61 is provided at the top of the spray tower 6. A packing layer 64 is installed inside the spray tower 6. The packing layer 64 increases the contact area and contact time between the gas and liquid phases. A spray pipe 66 is fixed to the inner wall of the spray tower 6 above the packing layer 64. The liquid inlet end of the spray pipe 66 is connected to the liquid outlet end of the liquid outlet pipe 62. The alkaline absorption slurry is atomized into 1500-2500μm droplets through the nozzles on the spray pipe 66 and sprayed downwards, forming a countercurrent contact with the exhaust gas flowing from bottom to top. The bottom of the spray tower 6 is equipped with a slurry pool 65. The air inlet end of the second connecting pipe 4 is connected to the air outlet end of the filter screen 12, and the air outlet end of the second connecting pipe 4 is connected to the air inlet end of the spray tower 6.

[0050] Working principle or structural principle: The original exhaust gas from the boiler enters the first connecting pipe 3 from the boiler exhaust gas outlet pipe. Since both the first connecting pipe 3 and the second connecting pipe 4 are equipped with sealing rings at one end, these sealing rings are used to seal the gap between the first connecting pipe 3 and the second connecting pipe 4 and the fixing frame 11, thereby ensuring that the exhaust gas will not leak from the connection and is completely introduced into the filter assembly 1. After the exhaust gas enters the fixing frame 11, it flows through the filter screen 12 fixed inside the insertion groove 14 by the limiting ring 13.

[0051] The filter screen 12 intercepts dust particles with a diameter greater than 5μm, completing the primary dust removal. At this time, the remaining filter screens 12 are in standby mode. The fixed frame 11 can rotate around the bearing relative to the support frame 7, thereby rotating the used filter screens 12 out of the airflow channel and rotating the standby filter screens 12 into the working position.

[0052] When the filter 12 needs to be switched, the operator pulls the lever 28 inward. The lever 28 causes the slide plate 24 to slide inward in the groove of the connecting frame 21, and the spring 27 is further compressed. The ball 25 at the end of the connecting rod 26 disengages from the limiting groove 22, and the fixing frame 11 changes from a fixed state to a rotatable state. At this time, the operator rotates the fixing frame 11 by the handle 15 to align the new filter 12 with the airflow channel. After rotation, the lever 28 is released, and the elastic force of the spring 27 quickly pushes the slide plate 24 back to its original position. The ball 25 automatically rolls into the adjacent limiting groove 22 under the push of the spring 27, completing the switching and locking of the filter 12. The ball 25 is rolled on one side of the fixing frame 11. The rolling contact method reduces the frictional resistance during insertion and removal, making the switching operation smoother.

[0053] The clean exhaust gas, after being filtered by the filter assembly 1, enters from the inlet end of the second connecting pipe 4 and is introduced from the bottom of the spray tower 6 through the outlet end of the second connecting pipe 4. At the same time, the circulating pump pressurizes and delivers the alkaline absorption slurry in the storage tank 5 to the outlet pipe 62, and then sends it into the interior of the spray tower 6 through the outlet pipe 62. The alkaline absorption slurry is atomized and sprayed downwards through the nozzles on the spray pipe 66, forming a countercurrent contact with the exhaust gas flowing from bottom to top. The bottom of the spray tower 6 is equipped with a slurry pool 65, in which the slurry after absorbing SO2 is collected. Part of the slurry is re-transported to the spray pipe 66 by the circulating pump for recycling, and the excess slurry is discharged and treated periodically.

[0054] After the desulfurization reaction is completed, the clean exhaust gas continues to flow upward and passes through the demister 63 fixed at the top of the inner wall of the spray tower 6. This removes droplets with a particle size greater than 10μm that are entrained in the exhaust gas, preventing slurry droplets from being discharged with the exhaust gas and causing secondary pollution and visible plumes. The exhaust gas is finally discharged into the atmosphere from the exhaust end 61 at the top of the spray tower 6.

[0055] The present invention also provides a method for treating boiler exhaust gas using a high-efficiency treatment device, comprising the following steps:

[0056] S1. Primary dust removal stage: The original exhaust gas from the boiler is introduced into the first connecting pipe 3, so that the exhaust gas enters the filter component 1 at a flow rate of 8-15 m / s. The exhaust gas flows through the filter screen 12, intercepting dust particles with a diameter greater than 5μm, so that the dust concentration is reduced from the initial 2000-5000 mg / m³ to below 50 mg / m³.

[0057] S2, Filter 12 switching stage: When the filter 12 that is processing boiler exhaust gas needs to be cleaned, pull the lever 28 in the corresponding limiting component 2 to make the ball 25 at the end of the connecting rod 26 disengage from the limiting groove 22 on the fixed frame 11, and the fixed frame 11 changes from a fixed state to a rotatable state; rotate the fixed frame 11 by the handle 15 to align the new filter 12 with the airflow channel, then release the lever 28, and use the force of the spring 27 to push the ball 25 into the adjacent limiting groove 22 to complete the switching;

[0058] S3, Wet Desulfurization Stage: The exhaust gas after dust removal enters from the bottom of the spray tower 6 through the second connecting pipe 4 and flows upward at an empty tower gas velocity of 1.0-2.5 m / s; the alkaline absorption slurry in the storage tank 5 is sent to the spray pipe 66 through the circulating pump and the outlet pipe 62, and is atomized into 1500-2500 μm droplets through the nozzles and sprayed downward; in the packing layer 64, the gas and liquid phases come into contact, sulfur dioxide is absorbed, and the pH value of the slurry is controlled at 5.5-6.5 and the liquid-to-gas ratio is 8-15 L / m³. 3 ;

[0059] S4. Demisting and Discharge Stage: The clean exhaust gas after desulfurization flows upward through the demister 63 to remove entrained droplets with a particle size greater than 10μm. Finally, the gas with a water content of less than 75 mg / m³ is discharged into the atmosphere from the exhaust end 61.

[0060] In summary, the boiler's raw exhaust gas enters the first connecting pipe 3 through the boiler exhaust gas outlet pipe. After entering the fixed frame 11, the exhaust gas flows through the filter screen 12 fixed inside the insertion slot 14 by the limiting ring 13, completing the primary dust removal and ensuring the cleanliness of the discharged exhaust gas. The remaining filter screens 12 are in a standby state. The fixed frame 11 can rotate relative to the support frame 7 around the bearing, thereby turning the used filter screens 12 out of the airflow channel and turning the standby filter screens 12 into the working position. This realizes the online replacement of filter screens 12 without stopping the machine, which greatly improves the continuity and efficiency of boiler exhaust gas treatment and reduces maintenance downtime and operation and maintenance costs.

[0061] When it is necessary to switch the filter screen 12, the operator only needs to pull the lever 28 inward. The lever 28 drives the slide plate 24 to slide inward in the groove of the connecting frame 21. The spring 27 is further compressed, and the ball 25 at the end of the connecting rod 26 disengages from the limiting groove 22. The fixed frame 11 then changes from a fixed state to a rotatable state. After rotating to the correct position, the lever 28 is released, and the elastic force of the spring 27 quickly pushes the slide plate 24 back to its original position. The ball 25 automatically rolls into the adjacent limiting groove 22 under the push of the spring 27, completing the switching and locking of the filter screen 12. The operation is simple and convenient.

[0062] The clean exhaust gas, after being filtered by the filter assembly 1, enters through the inlet of the second connecting pipe 4 and is then introduced from the bottom of the spray tower 6 through the outlet of the second connecting pipe 4. The circulating pump pressurizes and delivers the alkaline absorption slurry in the storage tank 5 to the outlet pipe 62, and then sends it into the interior of the spray tower 6. The alkaline absorption slurry is atomized and sprayed downwards through the nozzles on the spray pipe 66, forming a countercurrent contact with the exhaust gas flowing upwards. This countercurrent contact method keeps the concentration difference between the exhaust gas and the alkaline absorption slurry at a high level, improving the mass transfer driving force, thereby significantly improving the SO2 absorption efficiency and desulfurization effect, ensuring that the exhaust gas emissions meet the standards.

[0063] Those skilled in the art will understand that the features described in the various embodiments and / or claims of the present invention can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention can be combined or combined in various ways without departing from the spirit and teachings of the present invention. All such combinations and / or combinations fall within the scope of the present invention.

Claims

1. A high-efficiency boiler exhaust gas treatment device, characterized in that, Includes a filter assembly (1) for primary dust removal of the boiler's raw exhaust gas; The filter assembly (1) is provided with a limiting assembly (2) on one side, and a spray tower (6) is provided on one side of the limiting assembly (2). The spray tower (6) is used for desulfurization treatment of boiler exhaust gas. The filter assembly (1) includes a fixing frame (11), and a plurality of insertion slots (14) are provided on one side of the fixing frame (11). A limiting ring (13) is connected to the inside of the insertion slot (14) by bolts, and a filter screen (12) is installed inside the limiting ring (13). The outer side of the fixed frame (11) is rotatably connected to the support frame (7) via a bearing, and the first connecting pipe (3) and the second connecting pipe (4) are fixed on both sides of the support frame (7). The limiting component (2) includes a connecting frame (21), a sliding groove is provided on the inner side of the connecting frame (21), a sliding plate (24) is slidably connected to the inner side of the sliding groove, a connecting rod (26) is fixed on one side of the sliding plate (24), and a ball (25) is ball-connected to one end of the connecting rod (26). The fixing frame (11) has several limiting grooves (22) on one side, and the limiting grooves (22) are located outside the insertion groove (14).

2. The boiler exhaust gas high-efficiency treatment device according to claim 1, characterized in that, The sealing end is bonded to one side of the back of the limiting ring (13), and the sealing end is used to seal the gap between the limiting ring (13) and the insertion groove (14).

3. The boiler exhaust gas high-efficiency treatment device according to claim 1, characterized in that, The fixing frame (11) has a handle (15) fixed on the outside, and the connecting frame (21) is fixed to the top of the first connecting pipe (3).

4. The boiler exhaust gas high-efficiency treatment device according to claim 1, characterized in that, When the connecting rod (26) is inserted into the inner side of the limiting groove (22), the fixing frame (11) is in a fixed state. When the connecting rod (26) leaves the inner side of the limiting groove (22), the fixing frame (11) is in a rotating state.

5. The boiler exhaust gas high-efficiency treatment device according to claim 4, characterized in that, A pull rod (28) is fixed to the end of the slide plate (24) away from the connecting rod (26), and a spring (27) is sleeved on the outside of the pull rod (28).

6. The boiler exhaust gas high-efficiency treatment device according to claim 5, characterized in that, The opening end of the connecting frame (21) is connected to the cover plate (23) by bolts. The two ends of the spring (27) are respectively connected to one side of the cover plate (23) and the sliding plate (24). The pull rod (28) moves through one side of the cover plate (23). The ball (25) is rolled and connected to one side of the fixing frame (11).

7. The boiler exhaust gas high-efficiency treatment device according to claim 1, characterized in that, A sealing ring is installed at one end of the first connecting pipe (3) and the second connecting pipe (4). The sealing ring is used to seal the gap between the first connecting pipe (3) and the second connecting pipe (4) and the fixing frame (11).

8. The boiler exhaust gas high-efficiency treatment device according to claim 1, characterized in that, The spray tower (6) has a liquid storage tank (5) on the outside of the bottom. A circulation pump is installed inside the liquid storage tank (5). An outlet pipe (62) connected to the outlet end of the circulation pump is fixed on the top of the liquid storage tank (5). A demister (63) is fixed to the top of the inner wall of the spray tower (6), and an exhaust end (61) is provided at the top of the spray tower (6).

9. The boiler exhaust gas high-efficiency treatment device according to claim 8, characterized in that, The spray tower (6) is equipped with a packing layer (64) on its inner side. A spray pipe (66) located on the upper side of the packing layer (64) is fixed on the inner wall of the spray tower (6). The inlet end of the spray pipe (66) is connected to the outlet end of the outlet pipe (62). The spray tower (6) is provided with a slurry tank (65) at the bottom. The air inlet of the second connecting pipe (4) is connected to the air outlet of the filter screen (12), and the air outlet of the second connecting pipe (4) is connected to the air inlet of the spray tower (6).

10. A method for treating boiler exhaust gas using a high-efficiency treatment device according to any one of claims 1-9, characterized in that, Includes the following steps: S1, Primary dust removal stage: The original exhaust gas from the boiler is introduced into the first connecting pipe (3), so that the exhaust gas enters the filter assembly (1) at a flow rate of 8-15 m / s. The exhaust gas flows through the filter screen (12) and intercepts dust particles with a particle size greater than 5μm, so that the dust concentration is reduced from the initial 2000-5000 mg / m³ to below 50 mg / m³. S2, Filter screen (12) switching stage: When the filter screen (12) that is processing boiler exhaust gas needs to be cleaned, pull the lever (28) in the corresponding limiting component (2) to make the ball (25) at the end of the connecting rod (26) disengage from the limiting groove (22) on the fixed frame (11), and the fixed frame (11) changes from a fixed state to a rotatable state; rotate the fixed frame (11) by the handle (15) to align the new filter screen (12) with the airflow channel, then release the lever (28) and use the spring (27) force to push the ball (25) into the adjacent limiting groove (22) to complete the switching; S3, Wet desulfurization stage: The tail gas after dust removal enters from the bottom of the spray tower (6) through the second connecting pipe (4) and flows upward at an empty tower gas velocity of 1.0-2.5 m / s; the alkaline absorption slurry in the storage tank (5) is sent to the spray pipe (66) through the circulation pump and the outlet pipe (62), and is atomized into 1500-2500 μm droplets through the nozzle and sprayed downward; in the packing layer (64), the gas and liquid phases come into contact, sulfur dioxide is absorbed, and the pH value of the slurry is controlled at 5.5-6.5 and the liquid-gas ratio is 8-15 L / m 3 ; S4, Demisting and Discharge Stage: The clean exhaust gas after desulfurization flows upward through the demister (63) to remove entrained droplets with a particle size greater than 10μm. Finally, the gas with a water content of less than 75 mg / m³ is discharged into the atmosphere from the exhaust end (61).

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