Regeneration device and regeneration process for SCR (Selective Catalytic Reduction) denitration catalyst in cement industry

Abstract

The present invention relates to the field of catalyst regeneration, and discloses a cement industry SCR denitration catalyst regeneration apparatus and a regeneration process, the cement industry SCR denitration catalyst regeneration apparatus comprises a support box for fixation, the support box is connected with a closed box, the two sides of the closed box are rotatably connected with driving pipes, and the upper and lower sides of the closed box are respectively connected with a return pipe and an up-flow pipe connected with the support box; one side of the supporting box is provided with a power box connected with a driving pipe, one end of the driving pipe is fixedly connected with a rotating cylinder located in the closed box, the rotating cylinder is internally and rotatably connected with mixing pipes which are symmetrically arranged, and one end of each mixing pipe is rotatably connected with a driving box fixedly connected with the rotating cylinder. In the cleaning process, multiple mixing disturbance and fluid flowing can be conducted, so that impact friction is generated between raw materials and between the raw materials and internal devices, surface stains can be better removed, the cleaning effect is improved, meanwhile, the cleaning time is shortened, and the cleaning efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of catalyst regeneration, and particularly to a regeneration device and a regeneration process for SCR denitration catalysts in the cement industry. Background Art

[0002] The flue gas components at the tail of the cement industry kiln are complex. Commercial vanadium-titanium catalysts are the core of the SCR process. The main reaction principle is that ammonia and nitrogen monoxide or nitrogen dioxide are catalytically formed into nitrogen and water under the oxidation of oxygen. The SCR catalysts in the cement industry will be deactivated to a certain extent due to long-term use. The main reason is that the flue gas at the tail of the cement plant operates in an environment containing a certain concentration of sulfur oxides, water vapor and soot. Therefore, when there is an appropriate environment, sulfur oxides and water vapor in the flue gas will inevitably react with the reducing gas ammonia to form ammonium sulfate salts. Ammonium bisulfate is a viscous liquid that can block the pore structure of the catalyst and cover the active sites, resulting in a reduction in denitration efficiency and thus causing the deactivation of the catalyst. Directly discarding it increases costs and pollutes the environment. A low-cost and environmentally friendly method for catalyst regeneration is needed.

[0003] However, the existing cleaning methods in the industry are relatively rough. The whole catalyst is directly transported to a designated location and then cleaned. However, the overall flushing cannot well clean the inside of the catalyst completely. After cleaning, sulfur oxides will still remain in the catalyst pores, resulting in a shorter effective use time than the first time, requiring re-cleaning, affecting production efficiency, increasing the cleaning cost throughout the life cycle, and even affecting the process of cement production. Summary of the Invention

[0004] To solve the technical problems of complex regeneration process and high cost, the present invention provides a regeneration device and a regeneration process for SCR denitration catalysts in the cement industry.

[0005] The present invention is realized by the following technical solutions: A regeneration device for SCR denitration catalysts in the cement industry includes a support box for fixing. A closed box is connected to the support box. Driving pipes are rotatably connected to both sides of the closed box. A return pipe and an upper flow pipe connected to the support box are respectively connected to the upper and lower sides of the closed box. A power box connected to one of the driving pipes is arranged on one side of the support box. One end of the driving pipe is fixedly connected to a rotating cylinder located inside the closed box. Symmetrically arranged mixing pipes are rotatably connected inside the rotating cylinder. One end of the mixing pipe is rotatably connected to a driving box fixedly connected to the rotating cylinder. A power component is arranged inside the driving box. A plurality of rotating pipes are fixedly connected to the mixing pipe. One end of the mixing pipe is rotatably connected to a swinging ring through a ball hinge. A swinging rod connected to the rotating cylinder is connected to one side of the swinging ring. A plurality of blades are fixedly connected to the outer side of the rotating cylinder. A plurality of heating pipes are arranged inside both the mixing pipe and the rotating pipe. A plurality of ultrasonic generators are arranged inside the closed box.

[0006] As a further improvement of the above solution, the power assembly includes a motor fixedly connected to the drive box. The output end of the motor is connected to a power shaft. A second bevel gear is fixedly sleeved on the outside of the power shaft. The outside of the second bevel gear is meshed with symmetrically arranged first bevel gears. The two first bevel gears are respectively connected to the two mixing pipes. A monitor connected to the power shaft is fixedly connected inside the drive box.

[0007] As a further improvement of the above solution, a sealing plug is connected to the drive pipe on one side, and a connecting sleeve is connected to one end of the drive pipe on the other side.

[0008] As a further improvement of the above solution, a plurality of sensors are fixedly connected inside the closed box, and the closed box is filled with inert gas

[0009] As a further improvement of the above solution, a spiral coil is fixedly connected to the rotating cylinder. One end of the swing rod is rotatably connected to the spiral coil, and the other end of the swing rod is rotatably connected to the swing ring.

[0010] As a further improvement of the above solution, a rotating arc rod is fixedly connected to one end of the rotating pipe. Auxiliary holes are provided on the rotating arc rod, and a mixing rod is connected between the two auxiliary holes.

[0011] As a further improvement of the above solution, a partition plate is provided inside the support box. The support box is filled with filter material, and a replenishing pipe is connected to the support box.

[0012] As a further improvement of the above solution, a follower cover is rotatably connected to one end of the drive pipe. The follower cover is connected to the mixing pipe, and a plurality of overflow holes are provided on both the mixing pipe and the rotating pipe.

[0013] A regeneration process for a cement industry SCR denitration catalyst regeneration device includes the following steps:

[0014] S1: Place the catalyst to be regenerated in a crushing box for crushing treatment to make it into uniform particles;

[0015] S2: Use a tanker to carry the active liquid and dilute sulfuric acid solution, connect the regeneration device, take out the deactivated catalyst and put it into the regeneration device. Input deionized water into the regeneration device by a liquid pump. When the water level exceeds the top of the catalyst, perform ultrasonic cleaning. After the cleaning is completed, the waste water is discharged and transported back for centralized treatment;

[0016] S3: The liquid pump inputs dilute sulfuric acid solution. When the dilute sulfuric acid solution exceeds the top of the catalyst, turn on the ultrasonic wave to perform ultrasonic cleaning. After the cleaning is completed, the waste water is discharged and transported back for centralized treatment;

[0017] S4: The liquid pump inputs ammonium metavanadate solution. When the solution exceeds the top of the catalyst, turn on the ultrasonic wave to perform ultrasonic cleaning. After the cleaning is completed, the waste water is discharged and transported back for centralized treatment;

[0018] S5: Turn on the heating of the regeneration device, install the reactor. After completion, introduce NH3 into the regeneration device to conduct thermal reduction regeneration on the catalyst. The gas after reduction is processed through the reactor reaction;

[0019] S6: Extract and recycle the processed catalyst, and clean the inside of the regeneration device;

[0020] S7: Sinter and shape the catalyst again after cleaning and recycling.

[0021] As a further improvement of the above solution, in step S4, the heating temperature is 100 - 800 degrees Celsius.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. Through the regeneration device, multiple different cleaning methods can be realized in one device. During cleaning, multiple mixing disturbances and fluid flows can be carried out, enabling the raw materials to collide and rub against each other and against the internal device, which can better remove surface stains, reduce the cleaning time while improving the cleaning effect, improve the cleaning efficiency, restore it to its original state, and enable better reuse.

[0024] 2. At the same time, by using the treated tail gas, the production of other useful substances can be realized, achieving resource utilization. Thermal regeneration can also remove the moisture in the first two steps, achieving a drying effect. Overall, resources are saved while ensuring the stability of the regeneration quality. Brief Description of the Drawings

[0025] Figure 1 It is the front view structure diagram of the present invention;

[0026] Figure 2 It is the partial front view structure diagram of the present invention;

[0027] Figure 3 It is the main view sectional schematic diagram of the present invention;

[0028] Figure 4 It is Figure 2 The enlarged structure diagram at A in

[0029] Figure 5 It is the partial front view structure diagram of the power component;

[0030] Figure 6 It is the main view sectional schematic diagram of the power component.

[0031] Main Symbol Description:

[0032] 01. Power box; 02. Supplementary pipe; 03. Support box; 04. Connecting sleeve; 05. Enclosed box; 06. Return pipe; 07. Drive box; 08. Mixing pipe; 09. Swing ring; 11. Rotating cylinder; 12. Upflow pipe; 14. Rotating pipe; 15. Blade; 16. Ultrasonic generator; 17. Drive pipe; 18. Swing rod; 19. Rotating arc rod; 22. First bevel gear; 23. Second bevel gear; 24. Motor; 25. Monitor. Detailed implementation mode

[0033] Next, in combination with the attached drawings and the detailed implementation mode, the present invention will be further described. It should be noted that, on the premise of no conflict, any combination can be formed among the following-described embodiments or technical features to form a new embodiment.

[0034] Embodiment 1:

[0035] Please combine with Figures 1-6, A SCR denitration catalyst regeneration device for the cement industry, including a support box 03 for fixing. A closed box 05 is connected to the support box 03. Driving tubes 17 are rotatably connected to both sides of the closed box 05. The support box 03 is of a frame structure, used to support the closed box 05. At the same time, the support box 03 adopts a hollow structure, providing channels for subsequent water flow filtration, etc. Return pipes 06 and upstream pipes 12 connected to the support box 03 are respectively connected to the upper and lower sides of the closed box 05. A power box 01 connected to one of the driving tubes 17 is arranged on one side of the support box 03. The upstream pipe 12 and the return pipe 06 conduct the internal liquid diversion, and then filter inside the support box 03 to form a cycle. A power unit is arranged in the power box 01 to provide power, causing the driving tube 17 to rotate. One end of the driving tube 17 is fixedly connected to a rotating cylinder 11 located inside the closed box 05. Symmetrically arranged mixing tubes 08 are rotatably connected inside the rotating cylinder 11. One end of the mixing tube 08 is rotatably connected to a driving box 07 fixedly connected to the rotating cylinder 11. A power assembly is arranged in the driving box 07. The rotation of the driving tube 17 drives the rotation of the rotating cylinder 11. At the same time, the power assembly causes the mixing tube 08 to rotate for mixing and stirring. A plurality of rotating tubes 14 are fixedly connected to the mixing tube 08. One end of the mixing tube 08 is rotatably connected to a swing ring 09 through a ball hinge. One side of the swing ring 09 is connected to a swing rod 18 connected to the rotating cylinder 11. A plurality of paddle blades 15 are fixedly connected to the outside of the rotating cylinder 11. A plurality of heating tubes are arranged in both the mixing tube 08 and the rotating tube 14. A plurality of ultrasonic generators 16 are arranged inside the closed box 05. The rotation of the mixing tube 08 drives the rotation of the rotating tube 14. At the same time, during the rotation, due to the limitation of the swing rod 18, the swing ring 09 rotates and swings, pushing the fluid inside the rotating cylinder 11 to be disordered. The heating tubes can heat the inside of the rotating cylinder 11. Driven by the rotating cylinder 11, the paddle blades 15 cause the volume of a part of the space inside the closed box 05 to change, so that the internal liquid enters the support box 03 through the return pipe 06, and then returns to the inside of the closed box 05 through the upstream pipe 12, realizing the flow of water. The ultrasonic generators 16 generate ultrasonic waves with the same frequency as the raw materials or water for auxiliary cleaning.

[0036] The power assembly includes a motor 24 fixedly connected to the driving box 07. The output end of the motor 24 is connected to a power shaft. A second bevel gear 23 is fixedly sleeved on the outside of the power shaft. Symmetrically arranged first bevel gears 22 are meshed and connected to the outside of the second bevel gear 23. The two first bevel gears 22 are respectively connected to the two mixing tubes 08. A monitor 25 connected to the power shaft is fixedly connected inside the driving box 07. Through the power output of the motor 24, the rotation of the power shaft is driven. Further, through the transmission of the second bevel gear 23 and the first bevel gears 22, the mixing tubes 08 on both sides rotate in different directions to disturb the inside of the rotating cylinder 11. At the same time, the monitor 25 monitors the rotation speed and torque to monitor the operation of the device.

[0037] The drive tube 17 on one side is connected with a sealing plug, and one end of the drive tube 17 on the other side is connected with a connecting sleeve 04. The sealing plug seals to ensure the connection with the power box 01, and the connecting sleeve 04 is convenient for connecting with a tanker to input raw materials.

[0038] A plurality of sensors are fixedly connected inside the closed box 05. The closed box 05 is filled with inert gas. The sensors measure data such as the rotation speed of the rotating cylinder 11 and the surface temperature of the rotating cylinder 11 to ensure that the operation is within a stable range.

[0039] A spiral coil is fixedly connected to the rotating cylinder 11. One end of the swing rod 18 is rotatably connected to the spiral coil, and the other end of the swing rod 18 is rotatably connected to the swing ring 09. The height of the spiral coil is different at different positions, thereby driving the swing rod 18 to move and realizing the swing of the swing ring 09.

[0040] One end of the rotating tube 14 is fixedly connected with a rotating arc rod 19. Auxiliary holes are provided on the rotating arc rod 19, and a mixing rod is connected between the two auxiliary holes. The rotating arc rod 19 assists in disturbing the materials inside, and the mixing rod strengthens the disturbing effect of the raw materials.

[0041] A partition plate is arranged inside the support box 03. The support box 03 is filled with filter materials. The support box 03 is connected with a supplement pipe 02. The partition plate divides the inside of the support box 03, and the filter materials filter the impurities in the fluid, reducing the content of impurities during the cleaning process, accelerating the cleaning process, and improving the cleaning effect of the raw materials.

[0042] One end of the drive tube 17 is rotatably connected with a follower cover, and the follower cover is connected with the mixing tube 08. A plurality of overflow holes are provided on both the mixing tube 08 and the rotating tube 14. The follower cover can better ensure the stable connection between the drive tube 17, the rotating cylinder 11 and the mixing tube 08, and the overflow holes are convenient for fluids or raw materials to enter the rotating cylinder 11.

[0043] The implementation principle of the embodiments of this application is as follows: During cleaning, raw materials are injected into the device through the connecting sleeve 04 connected to the tanker. Subsequently, the cleaning liquid or regeneration agent is also injected into the rotating cylinder 11 through the connecting sleeve 04 and the drive pipe 17. While injecting, the power unit in the power box 01 drives the drive pipe 17 to rotate, driving the internal rotating cylinder 11 to rotate synchronously, and further driving the paddle 15 to rotate. The rotating paddle 15 periodically squeezes the cavity of the closed box 05. Combining with the function of the hollow channel of the support box 03, the fluid in the rotating cylinder 11 forms a cycle through the return pipe 06, the support box 03, and the upper flow pipe 12. At the same time, during the cycle, filtration is carried out in the support box 03, reducing the number of impurities in the solution and ensuring the cleaning of the cycle. While cleaning, the motor 24 is started. Driven by the second bevel gear 23 and the first bevel gear 22, the symmetrical mixing pipes 08 rotate in opposite directions, driving the rotating pipes 14, the mixing rods, and the rotating arc rods 19 to rotate, disturbing the raw materials and the liquid. The staggered layout of the mixing rods and the auxiliary holes realizes micro-scale shearing, further removing the adsorbed substances on the raw materials. The swing ring 09 is periodically swung by the swing rod 18, generating longitudinal disturbances and forming three-dimensional turbulence. After the cleaning with clean water is completed, pickling is carried out, and then the raw materials are cleaned again with other solutions to complete the cleaning of the raw materials. After the cleaning is completed, the raw materials are sucked out by the pump truck and then catalytic work is carried out again.

[0044] Example 2:

[0045] Combined with Figures 1-6 , a regeneration process for SCR denitration catalysts in the cement industry includes the following steps:

[0046] S1: Place the catalyst to be regenerated in a crushing box for crushing treatment to make it into uniform particles;

[0047] S2: Use a tanker to carry the active liquid, connect the regeneration device, take out the deactivated catalyst and put it into the regeneration device. Input deionized water into the regeneration device by the liquid pump. When the water level exceeds the top of the catalyst, perform ultrasonic cleaning. After the cleaning is completed, the waste water is discharged and transported back for centralized treatment. Through multiple cleanings with deionized water, impurities such as fly ash on the surface are removed;

[0048] S3: The liquid pump inputs dilute sulfuric acid solution. When the dilute sulfuric acid solution exceeds the top of the catalyst, turn on the ultrasonic wave and perform ultrasonic cleaning. After the cleaning is completed, the waste water is discharged and transported back for centralized treatment. Through pickling, the alkali metal impurities on the catalyst are removed;

[0049] S4: The liquid pump inputs ammonium metavanadate solution. When the solution exceeds the top of the catalyst, turn on the ultrasonic wave and perform ultrasonic cleaning. After the cleaning is completed, the waste water is discharged and transported back for centralized treatment. The ammonium metavanadate solution increases the catalyst and replenishes the lost vanadium component;

[0050] S5: Turn on the heating of the regeneration device, install the reactor, and after completion, introduce NH3 into the regeneration device to conduct thermal reduction regeneration on the catalyst. The gas after reduction is treated through the reactor reaction;

[0051] S6: Extract and recycle the treated catalyst, and clean the interior of the regeneration device;

[0052] S7: Sinter and shape the recycled catalyst after cleaning again.

[0053] In step S4, the heating temperature is 100 to 800 degrees Celsius.

[0054] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantive changes and substitutions made by those skilled in the art based on the present invention fall within the scope of protection required by the present invention.

Claims

1. A cement industry SCR denitration catalyst regeneration device, characterized in that: It comprises a support box for fixing, a closed box is connected to the support box, both sides of the closed box are rotatably connected with driving tubes, the upper and lower sides of the closed box are respectively connected with a return tube and an upstream tube connected to the support box, one side of the support box is provided with a power box connected with a driving tube, one end of the driving tube is fixedly connected with a rotating cylinder located in the closed box, a symmetrically arranged mixing tube is rotatably connected in the rotating cylinder, one end of the mixing tube is rotatably connected with a driving box fixedly connected to the rotating cylinder, a power assembly is provided in the driving box, a plurality of rotating tubes are fixedly connected to the mixing tube, one end of the mixing tube is rotatably connected with a swing ring through a ball joint, one side of the swing ring is connected with a swing rod connected to the rotating cylinder, a plurality of paddles are fixedly connected to the outer side of the rotating cylinder, a plurality of heating tubes are provided in the mixing tube and the rotating tube, and a plurality of ultrasonic generators are provided in the closed box.

2. A cement industry SCR denitration catalyst regeneration device as claimed in claim 1, characterized in that: The power assembly includes a motor fixedly connected to a drive box, an output end of the motor is connected to a power shaft, a bevel gear 2 is fixedly sleeved on the outer side of the power shaft, a symmetrically arranged bevel gear 1 is meshedly connected on the outer side of the bevel gear 2, the two bevel gears 1 are respectively connected to two mixing tubes, and a monitor connected to the power shaft is fixedly connected inside the drive box.

3. A cement industry SCR denitration catalyst regeneration device as claimed in claim 1, characterized in that: The driving tube on one side is connected with a sealing plug, and one end of the driving tube on the other side is connected with a connecting sleeve.

4. A cement industry SCR denitration catalyst regeneration device as claimed in claim 1, characterized in that: A plurality of sensors are fixedly connected in the closed box, and the closed box is filled with inert gas.

5. A cement industry SCR denitration catalyst regeneration device as claimed in claim 1, characterized in that: The rotating cylinder is fixedly connected with a spiral ring, one end of the swing rod is rotationally connected with the spiral ring, and the other end of the swing rod is rotationally connected with the swing ring.

6. A cement industry SCR denitration catalyst regeneration device as claimed in claim 1, characterized in that: One end of the rotating tube is fixedly connected with a rotating arc rod, and the rotating arc rod is provided with an auxiliary hole, and a mixing rod is connected between the two auxiliary holes.

7. A cement industry SCR denitration catalyst regeneration device as claimed in claim 1, characterized in that: A partition plate is arranged in the support box, the support box is filled with filter material, and a supplementary pipe is connected to the support box.

8. The cement industry SCR denitration catalyst regeneration device according to claim 1, characterized in that: One end of the driving tube is rotatably connected with a follower cover, the follower cover is connected to a mixing tube, and a plurality of overflow holes are arranged on the mixing tube and the rotating tube.

9. The regeneration process of the cement industry SCR denitration catalyst regeneration device according to claim 1 is characterized in that: The following steps are involved: S1: The catalyst to be regenerated is placed in a crushing box for crushing to form uniform particles; S2: Use a tank truck to carry active liquid and dilute sulfuric acid solution, connect to the regeneration device, take out the deactivated catalyst and put it into the regeneration device, input deionized water into the regeneration device by a liquid pump, and perform ultrasonic cleaning when the water volume covers the top of the catalyst. After the cleaning is completed, the waste water is discharged and transported back for centralized treatment; S3: The liquid pump inputs dilute sulfuric acid solution. When the dilute sulfuric acid solution covers the top of the catalyst, the ultrasound is turned on for ultrasonic cleaning. After the cleaning is completed, the wastewater is discharged and transported back for centralized treatment; S4: The liquid pump inputs the ammonium metavanadate solution. When the solution covers the top of the catalyst, the ultrasound is turned on for ultrasonic cleaning. After the cleaning is completed, the wastewater is discharged and transported back for centralized treatment; S5: Turn on the regeneration device for heating and install the reactor. After completion, introduce NH3 into the regeneration device to perform thermal reduction regeneration on the catalyst. After reduction, the gas passes through the reactor for reaction treatment; S6: extracting and recovering the treated catalyst and cleaning the interior of the regeneration device; S7: sintering the cleaned and recovered catalyst again.

10. A regeneration process for SCR denitration catalyst in cement industry as claimed in claim 9, characterized in that: In step S4, the heating temperature is between 100 and 800 degrees Celsius.

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