Purification device and technology applied to carbon black tail gas treatment

Abstract

The invention relates to the technical field of tail gas treatment, and discloses a purification device and process applied to carbon black tail gas treatment.The purification device applied to carbon black tail gas treatment comprises a denitration treatment equipment body, the outer wall of the gas spraying end of a spraying pipe is fixedly sleeved with a connecting pipe, and the inner wall of the connecting pipe is fixedly connected with a rotating frame; a flow guide block is rotationally connected to the upper portion of the rotating frame, a plurality of through holes are annularly formed in the middle of the connecting pipe at equal intervals, the outer wall of the connecting pipe is sleeved with a lantern ring, and a flow dividing ring is arranged in the connecting pipe. Due to the arrangement of the flow guide block and the flow dividing ring, ammonia gas in the connecting pipe flows in two paths, one path of airflow is sprayed out through an annular gap between the flow guide block and the connecting pipe to form annular umbrella-shaped airflow to weaken the local low-pressure effect of jet flow entrainment and hair suction, and the other path of airflow is sprayed out through the lantern ring to form an annular air curtain on the outer wall of the connecting pipe to weaken the local low-pressure effect of jet flow entrainment and hair suction. And dust in the tail gas is actively prevented from approaching the port of the connecting pipe.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas treatment technology, and in particular to a purification device and process for treating carbon black exhaust gas. Background Technology

[0002] In carbon black production, the high-temperature exhaust gas generated from incomplete combustion of fuel contains high concentrations of nitrogen oxides, sulfur dioxide, and ultrafine carbon black dust. This type of dust has small particle size, large specific surface area, and strong adsorption capacity, posing a significant pollution hazard. To achieve environmental compliance, carbon black exhaust gas needs to be purified. Denitrification is the core process for removing nitrogen oxides from the exhaust gas. This requires injecting ammonia into the flue gas through an ammonia injection grid, where, under the action of a catalyst, the nitrogen oxides are converted into harmless nitrogen and water.

[0003] The ammonia injection grid is installed inside the flue of the denitrification equipment. The pretreated flue gas flows along the flue and comes into contact with the ammonia gas injected by the ammonia injection grid. During this process, dust in the flue gas easily adheres to the nozzles of the ammonia injection grid and causes blockage. The causes of blockage are complex, including local low pressure caused by jet entrainment, which causes dust to accumulate at the nozzles, and backflow of dust-laden gas caused by flue gas pressure fluctuations during equipment start-up and shutdown.

[0004] Nozzle clogging triggers a chain reaction of problems: First, it disrupts the uniformity of ammonia injection, leading to an imbalance in the ammonia-to-nitrogen ratio, decreased denitrification efficiency, and a surge in ammonia escape. The escaped ammonia reacts with sulfur trioxide in the flue gas to form viscous ammonium bisulfate, which, when combined with dust, adheres firmly to the surface of downstream filter bags, causing filter bag caking, reduced permeability, and a spike in system resistance. Ultimately, this necessitates unplanned shutdowns for cleaning or replacement of the filter bags. This not only severely impacts the continuous and stable operation of the purification unit but also significantly increases maintenance costs. Therefore, resolving the issue of easy clogging of ammonia injection grid nozzles is crucial for improving the reliability, economy, and environmental efficiency of carbon black exhaust gas treatment devices. Summary of the Invention

[0005] Given that existing technologies suffer from the problem that dust in exhaust gas can easily clog the nozzles of the ammonia injection grid, thus affecting the uniformity of ammonia injection, a purification device for treating carbon black exhaust gas is proposed.

[0006] The purpose is to: set up a guide block at the outlet to diffuse the flow range of ammonia gas, reduce the low-pressure area at the pipe opening, and guide some ammonia gas to form an annular air curtain on the outer pipe wall to avoid dust contact with the pipe wall.

[0007] The technical solution of this invention is a purification device for treating carbon black tail gas, comprising a denitrification treatment equipment body, an ammonia injection grid installed in the flue of the denitrification treatment equipment body, multiple injection pipes installed on the ammonia injection grid, a connecting pipe fixedly sleeved on the outer wall of the injection end of the injection pipe, a rotating frame fixedly connected to the inner wall of the connecting pipe, a guide block rotatably connected above the rotating frame, the guide block being conical at the top and frustum-shaped at the bottom, the lower part of the guide block being disposed in the upper port of the connecting pipe, multiple through holes being annularly spaced in the middle of the connecting pipe, a collar sleeved on the outer wall of the connecting pipe, the lower end of the collar being lower than the through holes and sealingly connected to the outer wall of the connecting pipe, a diversion ring being disposed inside the connecting pipe, the diversion ring being installed at the bottom of the rotating frame, and a diversion slope being provided at the bottom of the diversion ring, the diversion slope being used to guide part of the ammonia gas through the through holes into the space between the collar and the connecting pipe.

[0008] Furthermore, a rotating cavity is provided in the lower part of the guide block, the rotating frame has a T-shaped structure, and the upper part of the rotating frame extends into the rotating cavity. A support ring is provided on the outer wall of the rotating frame, and multiple balls are rotatably connected in an annular pattern on the top surface of the support ring. The balls are in rolling contact with the top surface of the rotating cavity. Multiple guide plates are fixedly connected in an annular pattern on the lower outer wall of the guide block, and the guide plates have a spiral structure.

[0009] Furthermore, the diameter of the middle part of the guide block is larger than the outer diameter of the connecting pipe.

[0010] Furthermore, an impeller is fixedly connected to the inner side of the flow splitting ring, and a rotating shaft is fixedly connected to the middle of the impeller. The rotating shaft movably passes through the rotating frame and extends into the rotating cavity. Multiple diffusion grooves are formed on the flow splitting inclined surface, and the depths of two adjacent diffusion grooves are different.

[0011] Furthermore, a shielding ring is slidably sleeved on the upper end of the outer wall of the collar, and a positioning ring is provided above the collar. The positioning ring is fixedly installed on the outer wall of the connecting pipe, and the shielding ring and the positioning ring overlap and cooperate.

[0012] Furthermore, an annular groove is formed inside the guide block, and the annular groove is connected to the rotating cavity. Multiple trapezoidal blocks are fixedly arranged in annular shape at equal intervals on the top and bottom surfaces of the annular groove. A crossbar is fixedly connected to the upper end of the rotating shaft, and guide wheels are rotatably connected to both ends of the crossbar. The guide wheels are arranged inside the annular groove.

[0013] Furthermore, the upper part of the rotating frame is axially fixed with multiple protrusions, the support ring is in vertical sliding contact with the outer wall of the rotating frame, and multiple elastic elements are connected between the support ring and the rotating frame.

[0014] Furthermore, a rotating groove is provided inside the rotating frame, and a rotating plate is provided inside the rotating groove. Both sides of the rotating plate are connected to the rotating groove by elastic elements two, and the middle part of the rotating plate is connected and fixed to the rotating shaft.

[0015] Another objective of this invention is to provide a carbon black tail gas purification process, the purpose of which is to: set a guide block inside the outlet pipe port so that the sprayed ammonia gas is pressurized and quickly diffuses in an umbrella shape, driving the dust near the pipe wall to move, while at the same time making some of the ammonia gas form an annular gas curtain outside the pipe wall to avoid dust contamination.

[0016] To achieve the above objectives, the present invention provides the following technical solution: a carbon black tail gas purification process, comprising the following steps: S1. Waste heat recovery: High-temperature exhaust gas enters the front flue of the main body of the denitrification treatment equipment. Through waste heat recovery or heat exchange device, the flue gas temperature is precisely adjusted to the optimal activity window of the catalyst. S2, Ammonia Mixing: Ammonia gas is sprayed from the nozzle in the middle flue, flows in the same direction as the exhaust gas, and enters the static mixer for uniform mixing; S3. Catalytic reduction reaction: The uniformly mixed gas enters the SCR reactor containing honeycomb or plate catalyst. Under the action of the active sites on the catalyst surface, the mixed gas undergoes a selective catalytic reduction reaction to generate harmless nitrogen and water, thus achieving denitrification of the tail gas. S4. Post-purification treatment: The exhaust gas after denitrification enters the desulfurization equipment for deep purification, and the ammonia escape is monitored. The exhaust gas is discharged after passing the test.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The design of the guide block and the flow splitting ring enables the ammonia gas in the connecting pipe to flow in two directions. One airflow is ejected through the annular gap between the guide block and the connecting pipe, forming an annular umbrella-shaped airflow, which reduces the low-pressure area at the port of the connecting pipe and weakens the local low-pressure effect generated by the jet entrainment. The other airflow is ejected through the collar and forms an annular air curtain on the outer wall of the connecting pipe, which actively blocks dust in the exhaust gas from approaching the port of the connecting pipe. Through the double protection structure, the risk of dust backflow causing nozzle blockage is effectively avoided.

[0018] 2. When the diversion ring rotates, the diffusion grooves of different depths alternately overlap with the through holes, causing the cross-sectional size of the ammonia gas passing through the through holes to change dynamically with the rotation cycle. Ultimately, the annular air curtain formed on the outside of the connecting pipe is in an unstable dynamic airflow state, effectively avoiding the problem of dust easily adhering and accumulating under a stable airflow field.

[0019] 3. The guide wheel and trapezoidal block work together to make the guide block and the flow splitting ring move up and down frequently. On the one hand, it can shake off the dust adhering to the upper part of the guide block and the outer wall of the connecting pipe, so as to avoid the dust from accumulating and solidifying in the nozzle area. On the other hand, it further adjusts the instantaneous flow rate of ammonia gas through the through hole, so that the airflow intensity and purging range of the annular air curtain can change continuously and dynamically, thereby enhancing the purging and stripping effect on the dust around the nozzle. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the purification device for treating carbon black exhaust gas according to the present invention; Figure 2 This is a schematic diagram of the nozzle and connecting pipe structure of the purification device for treating carbon black tail gas according to the present invention; Figure 3 This is a schematic diagram of the internal structure of the connecting pipe of the purification device for treating carbon black tail gas according to the present invention; Figure 4 This is a schematic cross-sectional view of the flow guide block structure of the purification device for treating carbon black tail gas according to the present invention; Figure 5 This is a schematic cross-sectional view of the connecting pipe and collar structure of the purification device for treating carbon black tail gas according to the present invention. Figure 6 This is a schematic diagram of the diversion ring structure of the purification device for treating carbon black tail gas according to the present invention; Figure 7 The present invention relates to a purification device for treating carbon black exhaust gas. Figure 3 Enlarged schematic diagram of the structure at point A in the middle; Figure 8 This is a schematic diagram of the rotating shaft and rotating frame structure of the purification device for treating carbon black tail gas according to the present invention.

[0021] In the picture: 1. Main body of denitrification equipment; 2. Ammonia spraying grid; 3. Spray pipe; 4. Connecting pipe; 5. Rotating frame; 6. Guide block; 7. Rotating chamber; 8. Support ring; 9. Ball bearing; 10. Guide plate; 11. Through hole; 12. Diverting ring; 13. Diverting inclined surface; 14. Impeller; 15. Rotating shaft; 16. Diffusion groove; 17. Shielding ring; 18. Positioning ring; 19. Annular groove; 20. Trapezoidal block; 21. Crossbar; 22. Guide wheel; 23. Elastic component one; 24. Rotating groove; 25. Rotating plate; 26. Elastic component two; 27. Collar. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Example 1, referring to Figures 1-6This is the first embodiment of the present invention, which provides a purification device for treating carbon black tail gas, including a denitrification treatment equipment body 1. An ammonia injection grid 2 is installed in the flue of the denitrification treatment equipment body 1. Multiple injection pipes 3 are installed on the ammonia injection grid 2. A connecting pipe 4 is fixedly sleeved on the outer wall of the injection end of the injection pipe 3. A rotating frame 5 is fixedly connected to the inner wall of the connecting pipe 4. A guide block 6 is rotatably connected above the rotating frame 5. The upper part of the guide block 6 is conical and the lower part is frustoconical. The lower part of the guide block 6 is located in the upper port of the connecting pipe 4. Multiple through holes 11 are opened in a ring at equal intervals in the middle of the connecting pipe 4. A collar 27 is sleeved on the outer wall of the connecting pipe 4. The lower end of the collar 27 is lower than the through holes 11 and is sealed to the outer wall of the connecting pipe 4. A diversion ring 12 is provided in the connecting pipe 4. The diversion ring 12 is installed at the bottom of the rotating frame 5. A diversion slope 13 is opened at the bottom of the diversion ring 12. The diversion slope 13 is used to guide part of the ammonia gas through the through holes 11 and into the space between the collar 27 and the connecting pipe 4.

[0024] Specifically, after ammonia gas is delivered to the inside of the connecting pipe 4 through the nozzle 3, it forms a dual-flow injection structure: one airflow flows upward along the inside of the connecting pipe 4 and is ejected through the annular gap between the upper port of the connecting pipe 4 and the guide block 6. Under the guidance of the frustum-shaped structure at the lower part of the guide block 6, the airflow diffuses uniformly outward in an annular umbrella shape. This diffusion method can effectively fill the area around the upper port of the connecting pipe 4, significantly weaken the local low-pressure effect of jet entrainment, and reduce the residence and accumulation of ultrafine carbon black dust in the exhaust gas in this area; the other airflow, under the inclined guidance of the diversion slope 13 at the bottom of the diversion ring 12, passes through the through hole 11 and enters the collar 2. The sealed chamber between 7 and the outer wall of the connecting pipe 4 is then sprayed upwards along the chamber, forming a continuous and stable annular air curtain on the outside of the connecting pipe 4. This air curtain can actively block dust in the exhaust gas from approaching the upper port of the connecting pipe 4 and the through hole 11. The dual protection structure works together to reduce the risk of nozzle blockage caused by dust adhesion and backflow from the source, ensure the uniformity of ammonia injection of the ammonia grid 2, maintain a stable ammonia-nitrogen ratio, thereby improving denitrification efficiency, reducing ammonia escape, avoiding downstream filter bag caking and system resistance spikes, and ultimately achieving continuous and stable operation of the purification device, reducing maintenance costs, and improving the reliability and economy of equipment operation.

[0025] Reference Figure 8 , Figure 3 , Figure 4 The lower part of the guide block 6 has a rotating cavity 7. The rotating frame 5 has a T-shaped structure and the upper part of the rotating frame 5 extends into the rotating cavity 7. The outer wall of the rotating frame 5 is provided with a support ring 8. The top surface of the support ring 8 is rotatably connected with multiple balls 9 at equal intervals in an annular shape. The balls 9 roll in contact with the top surface of the rotating cavity 7. The lower outer wall of the guide block 6 is fixedly connected with multiple guide plates 10 at equal intervals in an annular shape. The guide plates 10 have a spiral structure.

[0026] Specifically, the guide block 6 and the rotating frame 5 form a low-friction, smooth rotation structure through the rotating cavity 7, support ring 8, and ball bearings 9, ensuring its flexible response to airflow and stable rotation. When the ammonia gas flows over the surface of the guide block 6, it generates a tangential force with the multiple spiral guide plates 10 fixed at equal intervals on the lower outer wall of the guide block 6. This force drives the guide block 6 to rotate continuously around the axis of the rotating frame 5. On the one hand, this causes the annular umbrella-shaped airflow ejected through the gap between the upper port of the connecting pipe 4 and the guide block 6 to be superimposed with rotational kinetic energy, further expanding the rotational kinetic energy. The airflow diffusion range more comprehensively covers the exhaust gas flow area in the flue, while weakening the formation of local low-pressure areas. On the other hand, the rotating guide block 6 and the spiral guide plate 10 work together to make the sprayed ammonia gas diffuse in a spiral shape, which can form a strong turbulent mixing effect with the carbon black exhaust gas flowing through the flue in the initial contact stage, breaking the airflow stratification phenomenon and significantly improving the initial mixing uniformity of ammonia gas and exhaust gas. This lays the foundation for the precise control of the ammonia nitrogen ratio in the subsequent denitrification reaction, while further reducing the risk of dust adhesion and accumulation in the nozzle area.

[0027] Reference Figure 3 The diameter of the middle part of the guide block 6 is larger than the outer diameter of the connecting pipe 4.

[0028] Specifically, the size-adaptive design of the guide block 6 allows it to provide comprehensive and tight protection to the upper port of the connecting pipe 4 when the equipment stops operating or ammonia injection is interrupted. This effectively prevents ultrafine carbon black dust suspended in the flue from falling directly into the connecting pipe 4, cutting off the path for dust to enter the nozzle channel from the non-operating state of the equipment shutdown. This further reduces the potential risk of nozzle blockage and ensures the cleanliness of the ammonia injection grille 2 and the internal channels of the connecting pipe 4. Reference Figure 5 , Figure 6 An impeller 14 is fixedly connected to the inner side of the flow divider ring 12, and a rotating shaft 15 is fixedly connected to the middle of the impeller 14. The rotating shaft 15 movably passes through the rotating frame 5 and extends into the rotating cavity 7. Multiple diffusion grooves 16 are opened on the flow divider inclined surface 13, and the depths of two adjacent diffusion grooves 16 are different.

[0029] Specifically, the impeller 14 fixed inside the diversion ring 12 and the rotating shaft 15 form a linkage structure. When the ammonia gas flows along the inside of the connecting pipe 4 and passes through the impeller 14, the airflow impact force will drive the impeller 14 to drive the diversion ring 12 to rotate synchronously. At the same time, the multiple diffusion grooves 16 opened on the diversion slope 13 are designed with adjacent grooves of different depths. As the diversion ring 12 continues to rotate, the diffusion grooves 16 of different depths will alternately overlap with the through holes 11 on the connecting pipe 4, so that the cross-sectional size of the ammonia gas passing through the through holes 11 and entering the collar 27 and the connecting pipe 4 changes dynamically with the rotation cycle. This causes the airflow pressure entering this area to fluctuate periodically, ultimately making the annular air curtain formed on the outside of the connecting pipe 4 present an unstable dynamic airflow state. This effectively avoids the problem of dust easily adhering and accumulating under a stable airflow field. At the same time, the dynamically fluctuating air curtain can form a more comprehensive purging and cleaning effect on the periphery of the upper port of the connecting pipe 4 and the area of ​​the through holes 11, further enhancing the anti-clogging ability and ensuring the continuity and reliability of the air curtain protection.

[0030] Reference Figure 7 A shielding ring 17 is slidably sleeved on the upper end of the outer wall of the collar 27, and a positioning ring 18 is provided above the collar 27. The positioning ring 18 is fixedly installed on the outer wall of the connecting pipe 4, and the shielding ring 17 and the positioning ring 18 overlap and cooperate.

[0031] Specifically, during ammonia injection, the ammonia gas flow from the collar 27 acts upward, pushing the shielding ring 17 to slide upward along the outer wall of the collar 27, causing it to disengage from the positioning ring 18, thereby opening the annular air outlet channel and allowing the airflow to form an annular air curtain that sprays outward. When the ammonia injection grid 2 stops supplying ammonia, the airflow thrust disappears, and the shielding ring 17 automatically falls back to its original position under its own gravity, re-engaging tightly with the positioning ring 18 fixed to the outer wall of the connecting pipe 4, thus reliably sealing the upper air outlet of the collar 27. This effectively prevents carbon black dust in the flue from flowing back into the chamber between the collar 27 and the connecting pipe 4, structurally avoiding the channel blockage caused by dust intrusion during shutdown.

[0032] Example 2, refer to Figure 8 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: an annular groove 19 is provided in the flow guide block 6, the annular groove 19 is connected to the rotating cavity 7, and multiple trapezoidal blocks 20 are fixedly provided in annular and equally spaced on the top and bottom surfaces of the annular groove 19; a crossbar 21 is fixedly connected to the upper end of the rotating shaft 15, and guide wheels 22 are rotatably connected to both ends of the crossbar 21, and the guide wheels 22 are disposed in the annular groove 19.

[0033] Specifically, when the diversion ring 12 rotates, it drives the rotating shaft 15 to rotate synchronously. The guide wheel 22 and the multiple trapezoidal blocks 20 arranged at equal intervals on the top and bottom surfaces of the annular groove 19 form intermittent squeezing contact, thereby driving the guide block 6 to generate continuous vertical high-frequency fine vibration. This vibration can promptly shake off the ultrafine carbon black dust adhering to the surface of the guide block 6 and the port of the connecting pipe 4, preventing dust from accumulating and solidifying in the nozzle area, reducing the probability of nozzle blockage from the source, ensuring the long-term smooth flow of the ammonia injection channel, and improving the operational stability and denitrification effect of the ammonia injection grid 2.

[0034] The tilt angle of the impeller 14 is different from that of the guide plate 10, which makes the driving force of the airflow to push the flow splitting ring 12 and the guide block 6 different. Therefore, there is a speed difference between the guide block 6 and the flow splitting ring 12, thereby enabling the guide wheel 22 to rotate in the annular groove 19.

[0035] Reference Figure 4 The upper part of the rotating frame 5 is axially fixed with multiple protrusions, the support ring 8 is in vertical sliding contact with the outer wall of the rotating frame 5, and multiple elastic elements 23 are connected between the support ring 8 and the rotating frame 5.

[0036] Specifically, during the process of vertical fine vibration of the guide block 6, the elastic element 23 will elastically stretch and contract with the up and down movement of the support ring 8 and cooperate with the protrusion to form auxiliary vibration, thereby effectively amplifying the vibration amplitude and vibration intensity of the guide block 6, enhancing the shaking and cleaning effect on the dust adhering to the guide block 6 and the port of the connecting pipe 4, and further reducing the risk of dust accumulation and blockage.

[0037] Reference Figure 8 The rotating frame 5 has a rotating groove 24, and a rotating plate 25 is provided in the rotating groove 24. Both sides of the rotating plate 25 are connected to the rotating groove 24 by elastic elements 26, and the middle part of the rotating plate 25 is connected and fixed to the rotating shaft 15.

[0038] Specifically, when the guide wheel 22 intermittently contacts the trapezoidal block 20 and generates vertical disturbance, the rotating shaft 15 transmits the disturbance to the rotating plate 25. The rotating plate 25, in the rotating groove 24, cooperates with the elastic elements 26 on both sides to generate elastic swing and slight reciprocating motion, thereby driving the diversion ring 12 to perform synchronous up and down slight motion. This motion can dynamically change the relative position between the diversion slope 13 and the through hole 11, further adjusting the flow area and instantaneous flow rate of ammonia gas through the through hole 11, so that the airflow intensity and purging range of the annular air curtain continuously change dynamically, enhancing the purging and stripping effect on the dust around the nozzle, and further improving the anti-clogging performance of the device.

[0039] It should be noted that in this technical solution, elastic element 1 23 and elastic element 26 preferably adopt a helical spring structure. The remaining structures are the same as those in Embodiment 1.

[0040] Based on embodiments 1-2, the working principle of this invention is as follows: After ammonia gas enters the connecting pipe 4 through the nozzle 3, it forms a dual-path flow. One path diffuses in an annular umbrella shape along the gap between the guide block 6 and the connecting pipe 4, and merges with the exhaust gas. The other path is guided by the diversion slope 13 of the diversion ring 12, passes through the through hole 11, and forms an annular air curtain between the collar 27 and the connecting pipe 4, blocking dust from approaching. At the same time, the airflow drives the guide plate 10 to rotate the guide block 6, expanding the diffusion range of ammonia gas and improving the mixing uniformity with the exhaust gas. When the diversion ring 12 rotates, the impeller 14 is linked to the rotating shaft 15, causing the guide wheel 22 to intermittently contact the trapezoidal block 20 in the annular groove 19, causing the guide block 6 to vibrate vertically and finely. With the help of the elastic element 23, the vibration amplitude is amplified, shaking off surface dust. The multiple structures work together to achieve anti-clogging, uniform mixing, and stable spraying, ensuring denitrification efficiency.

[0041] Example 3, referring to Figures 1-8 The third embodiment of the present invention provides a carbon black tail gas purification process, comprising the following steps: S1. Waste heat recovery: High-temperature exhaust gas enters the front flue of the main body 1 of the denitrification treatment equipment. Through waste heat recovery or heat exchange device, the flue gas temperature is precisely adjusted to the optimal activity window of the catalyst. S2, Ammonia mixing: Ammonia gas is sprayed out from nozzle 3 in the middle flue, flows in the same direction as the exhaust gas, and enters the static mixer for uniform mixing; S3. Catalytic reduction reaction: The uniformly mixed gas enters the SCR reactor containing honeycomb or plate catalyst. Under the action of the active sites on the catalyst surface, the mixed gas undergoes a selective catalytic reduction reaction to generate harmless nitrogen and water, thus achieving denitrification of the tail gas. S4. Post-purification treatment: The exhaust gas after denitrification enters the desulfurization equipment for deep purification, and the ammonia escape is monitored. The exhaust gas is discharged after passing the test.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A purification device for treating carbon black tail gas, comprising a denitrification treatment equipment body (1), wherein an ammonia injection grid (2) is installed in the flue of the denitrification treatment equipment body (1), and a plurality of injection pipes (3) are installed on the ammonia injection grid (2), characterized in that, A connecting pipe (4) is fixedly sleeved on the outer wall of the nozzle (3) at the jet end. A rotating frame (5) is fixedly connected to the inner wall of the connecting pipe (4). A guide block (6) is rotatably connected above the rotating frame (5). The upper part of the guide block (6) is conical, and the lower part is frustum-shaped. The lower part of the guide block (6) is located inside the upper port of the connecting pipe (4). The middle part of the connecting pipe (4) has multiple through holes (11) arranged in a ring at equal intervals. The outer part of the connecting pipe (4) A sleeve (27) is provided on the wall. The lower end of the sleeve (27) is lower than the through hole (11) and is sealed to the outer wall of the connecting pipe (4). A diversion ring (12) is provided inside the connecting pipe (4). The diversion ring (12) is installed at the bottom of the rotating frame (5), and a diversion slope (13) is opened at the bottom of the diversion ring (12). The diversion slope (13) is used to guide part of the ammonia gas through the through hole (11) into the space between the sleeve (27) and the connecting pipe (4).

2. The purification device for treating carbon black tail gas according to claim 1, characterized in that, The lower part of the guide block (6) is provided with a rotating cavity (7). The rotating frame (5) has a T-shaped structure and the upper part of the rotating frame (5) extends into the rotating cavity (7). The outer wall of the rotating frame (5) is provided with a support ring (8). The top surface of the support ring (8) is rotatably connected with multiple balls (9) at equal intervals in a ring shape. The balls (9) are in rolling contact with the top surface of the rotating cavity (7). The lower outer wall of the guide block (6) is fixedly connected with multiple guide plates (10) at equal intervals in a ring shape, and the guide plates (10) have a spiral structure.

3. The purification device for treating carbon black tail gas according to claim 1, characterized in that, The diameter of the middle part of the guide block (6) is larger than the outer diameter of the connecting pipe (4).

4. The purification device for treating carbon black tail gas according to claim 2, characterized in that, An impeller (14) is fixedly connected to the inner side of the flow divider ring (12), and a rotating shaft (15) is fixedly connected to the middle of the impeller (14). The rotating shaft (15) moves through the rotating frame (5) and extends into the rotating cavity (7). Multiple diffusion grooves (16) are provided on the diversion slope (13), and the depths of two adjacent diffusion grooves (16) are different.

5. The purification device for treating carbon black tail gas according to claim 1, characterized in that, A shielding ring (17) is slidably sleeved on the upper end of the outer wall of the collar (27), and a positioning ring (18) is provided above the collar (27). The positioning ring (18) is fixedly installed on the outer wall of the connecting pipe (4), and the shielding ring (17) and the positioning ring (18) overlap and cooperate.

6. The purification device for treating carbon black tail gas according to claim 4, characterized in that, The guide block (6) has an annular groove (19) inside, which is connected to the rotating cavity (7). The top and bottom surfaces of the annular groove (19) are fixed with multiple trapezoidal blocks (20) at equal intervals in an annular shape. A crossbar (21) is fixedly connected to the upper end of the rotating shaft (15), and guide wheels (22) are rotatably connected to both ends of the crossbar (21). The guide wheels (22) are set in the annular groove (19).

7. The purification device for treating carbon black tail gas according to claim 2, characterized in that, The upper part of the rotating frame (5) is axially fixed with multiple protrusions, the support ring (8) slides vertically with the outer wall of the rotating frame (5), and multiple elastic elements (23) are connected between the support ring (8) and the rotating frame (5).

8. The purification device for treating carbon black tail gas according to claim 4, characterized in that, The rotating frame (5) has a rotating groove (24) inside, and a rotating plate (25) is provided inside the rotating groove (24). Both sides of the rotating plate (25) are connected to the rotating groove (24) by elastic element two (26), and the middle part of the rotating plate (25) is connected and fixed to the rotating shaft (15).

9. A carbon black tail gas purification process, applied to the purification device for carbon black tail gas treatment as described in claim 1, characterized in that, Includes the following steps: S1. Waste heat recovery: High-temperature exhaust gas enters the front flue of the main body (1) of the denitrification treatment equipment. Through waste heat recovery or heat exchange device, the flue gas temperature is precisely adjusted to the optimal activity window of the catalyst. S2, Ammonia mixing: Ammonia is sprayed out from the nozzle (3) in the middle flue, flows in the same direction as the tail gas, and enters the static mixer for uniform mixing; S3. Catalytic reduction reaction: The uniformly mixed gas enters the SCR reactor containing honeycomb or plate catalyst. Under the action of the active sites on the catalyst surface, the mixed gas undergoes a selective catalytic reduction reaction to generate harmless nitrogen and water, thus achieving denitrification of the tail gas. S4. Post-purification treatment: The exhaust gas after denitrification enters the desulfurization equipment for deep purification, and the ammonia escape is monitored. The exhaust gas is discharged after passing the test.

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