Flue gas denitration and desulfurization integrated equipment based on active molecule catalysis technology
The integrated flue gas denitrification and desulfurization equipment using active molecular catalytic technology utilizes electrostatic fields and spiral plate structures to recover activated carbon particles, thus solving the problem of activated carbon loss and achieving efficient flue gas treatment and activated carbon regeneration.
Patent Information
- Application Number
- CN202510900734.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-01
- Publication Date
- 2025-10-10
AI Technical Summary
In the prior art, activated carbon is severely lost during the flue gas flushing process, resulting in waste of resources and increased production costs, and there is a lack of effective means for recovering activated carbon particles.
The integrated flue gas denitrification and desulfurization equipment based on active molecular catalytic technology is used. Through the electrostatic field, vibrator and spiral plate structure, an electrostatic field and spiral plates with different spiral angles are formed. Combined with the difference in vibration frequency, the activated carbon particles are captured and recovered, and the active sites on the activated carbon surface are repaired using a recovery box and catalyst re-spraying device.
It achieves efficient recovery of activated carbon particles, reduces losses, improves economic benefits, extends the service life of activated carbon, and improves the removal efficiency of SO2 and NOx in flue gas.
Smart Images
Figure CN120754696A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of flue gas treatment technology, and in particular to an integrated flue gas denitrification and desulfurization device based on active molecular catalysis technology. Background Art
[0002] Desulfurization and denitrification equipment is commonly used in industrial production, coal gasification, and power industry purification. Desulfurization removes SO2 (sulfur dioxide) from flue gas, while denitrification primarily removes NOx (nitrogen oxides). These two substances, when released into the atmosphere, can form acid rain, which is extremely harmful to humans. Coal-fired flue gas contains these substances, leading to widespread promotion of environmentally friendly management and production practices.
[0003] Current flue gas denitrification and desulfurization technologies mainly include selective catalytic reduction (SCR), wet desulfurization, and dry desulfurization. Dry desulfurization technology primarily uses activated carbon adsorption, which removes SO2 and NOx (nitrogen oxides) from the flue gas by flushing activated carbon particles with flue gas. However, during the long-term flue gas flushing process, the activated carbon is washed away by the flue gas to form powder particles, causing carbon powder to be carried in the treated flue gas. There is a lack of effective means to recover activated carbon particles and other substances carried in the flue gas, resulting in a large loss of activated carbon particles. As an important catalyst carrier, the loss of activated carbon not only wastes resources, but also increases production costs and reduces the economic benefits of the entire treatment process. Summary of the Invention
[0004] In order to improve economic benefits, the present application provides an integrated flue gas denitrification and desulfurization device based on active molecular catalysis technology.
[0005] The integrated flue gas denitrification and desulfurization equipment based on active molecular catalytic technology includes an adsorption tower connected to a desorption tower via a pipeline, and the desorption tower is equipped with a carbon recovery device; The carbon recovery unit includes: An annular chimney is connected to the adsorption tower through a pipe. The chimney sleeve is arranged outside the adsorption sleeve. An annular partition is fixedly connected inside the chimney, and the partition divides the inside of the chimney into a first flue and a second flue. The inner wall of the first flue is slidably connected to a first spiral plate, the spiral angle a of the first spiral plate is between 15° and 25°, and the partition is provided with an opening near the first spiral plate and at the top of the flue; The inner wall of the second flue is slidably connected to a second spiral plate, the spiral angle b of the second spiral plate is between 30° and 45°, and ab=15°. The second flue is provided with a smoke outlet connected to the desorption tower. A driving battery is connected to the chimney, with the positive electrode of the driving battery connected to the first spiral plate and the negative electrode connected to the second spiral plate, forming a radially inward electrostatic field with an electrostatic field strength of 8-12 kV / cm; Two vibration generators are connected to the first spiral plate and the second spiral plate respectively. The vibration frequency of the first spiral plate is 50-60 Hz, and the vibration frequency of the second spiral plate is 80-90 Hz. The recovery box is connected to the chimney, and the first spiral plate and the second spiral plate extend into the recovery box.
[0006] By adopting the above technical solution, the activated carbon particles that have been washed into powder by the flue gas in the adsorption tower can be recovered, the loss of activated carbon particles can be reduced, and the economic benefits can be increased; the synergistic removal of sulfur dioxide and nitrogen oxides in the flue gas can be achieved; an electrostatic field is formed between the first spiral plate and the second spiral plate, which prompts the activated carbon particles to be adsorbed on the spiral plate, and the activated carbon particles are moved toward the bottom of the chimney under their own weight by the vibration effect; the first spiral plate and the second spiral plate with different spiral angles are conducive to the collection of activated carbon particles; the recovered activated carbon particles can also be transported to a recovery box for subsequent processing and recycling of the activated carbon.
[0007] Optionally, the vibration frequency difference between the first spiral plate and the second spiral plate is 30±5 Hz, and the vibration directions of the two are opposite.
[0008] By adopting the above technical solution, the first and second spiral plates have different vibration frequencies and opposite vibration directions, which avoids the same vibration frequency of the two. At the same time, the friction efficiency of the activated carbon particles in the flue gas can be improved, thereby improving the recovery rate of the activated carbon particles.
[0009] Optionally, the negative pole of the driving battery is extended and connected to an auxiliary electrode plate, which is arranged parallel to a side of the second spiral plate away from the partition, and the auxiliary electrode plate is spaced 5-10 mm from the second spiral plate.
[0010] By adopting the above technical solution, the auxiliary electrode plate connected to the negative pole of the driving battery and the second spiral plate have the same electric potential and a distance of 5-10mm, which can form a high gradient electric field region between the two. The electric field strength in this region can reach 1.5-2 times that of the main electric field, which can significantly improve the capture efficiency of tiny fine particles by enhancing the dielectrophoretic force.
[0011] Optionally, the surfaces of the first spiral plate and the second spiral plate are covered with a ceramic-graphene composite coating with a coating thickness of 0.2-0.5 mm and a friction coefficient of ≤0.15.
[0012] By adopting the above technical solution, a ceramic-graphene composite coating is covered on the surface of the first and second spiral plates, and the coating has a corresponding thickness and a low friction coefficient, which can reduce the scraping of the catalyst on the surface of the activated carbon particles when the activated carbon particles in the flue gas collide with the surface of the first and second spiral plates.
[0013] Optionally, the recovery tank is provided with an inclined guide plate, the guide plate has an angle of 40-50 degrees with the horizontal plane, the end of the guide plate is connected with an ultrasonic vibrator, and the ultrasonic frequency is 25-30 kHz.
[0014] By adopting the above technical scheme, the adsorption tower and the desorption tower can complete the denitration and desulfurization treatment of the flue gas, the annular flue of the carbon recovery device is divided into the first flue and the second flue by the partition plate, the first spiral plate in the first flue and the second spiral plate in the second flue can collect the activated carbon particles in the flue gas and make them fall into the recovery tank under the action of different spiral angles, vibration frequencies and the radial inward electrostatic field, the inclined guide plate with a specific angle and the ultrasonic vibrator with a specific ultrasonic frequency arranged in the recovery tank can effectively avoid the channel blockage and promote the activated carbon particles to gather at the bottom of the recovery tank.
[0015] Optionally, the opening of the partition plate is provided with an adjustable baffle, the opening degree of the baffle is linked with the flue gas flow to control, and the flow ratio of the first flue to the second flue is 1:(1.2-1.5).
[0016] By adopting the above technical scheme, the adjustable baffle is arranged at the opening of the partition plate, and the opening degree of the baffle is linked with the flue gas flow to control, so that the flow ratio of the first flue to the second flue is 1:(1.2-1.5), which can ensure that the activated carbon particles in the first flue have sufficient residence time and avoid the activated carbon particles from entering the desorption tower without being completely captured due to excessive flow in the second flue, thereby improving the recovery rate of the activated carbon particles.
[0017] Optionally, the recovery tank is connected with a catalyst supplement spraying device, the supplement spraying device sprays nano TiO2 sol into the recovery tank, and the particle size of the sol is 50-100 nm.
[0018] By adopting the above technical scheme, the recovery tank is connected with the catalyst supplement spraying device and sprays the nano TiO2 sol with a particle size of 50-100 nm into the recovery tank, which can repair the active sites lost on the surface of the activated carbon due to the reaction and prolong the service life of the activated carbon particles.
[0019] Optionally, the flue is connected with a guide fan, the air outlet pipe of the guide fan extends into the second flue, and the airflow generated by the fan flows along the second spiral plate into the desorption tower.
[0020] By adopting the above technical scheme, the flue is connected with the guide fan, the air outlet pipe of the fan extends into the second flue, and the airflow generated by the fan flows along the second spiral plate into the desorption tower, which can make the flue gas entering the second flue flow into the desorption tower from the smoke outlet under the action of the airflow.
[0021] Optionally, the electrostatic field strength is 10 kV / cm, the vibration frequency of the first spiral plate is 55 Hz, and the vibration frequency of the second spiral plate is 85 Hz.
[0022] By adopting the technical scheme, the electrostatic field strength is set to 10 kV / cm, the first spiral plate vibration frequency is set to 55 Hz, and the second spiral plate vibration frequency is set to 85 Hz, so that the recovery rate of the activated carbon particles can be improved.
[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. By the activated carbon moving bed, the spraying device and the heating device in the adsorption tower, SO2 and NO in flue gas can be efficiently and synergistically removed x ; 2. The carbon recovery device can efficiently recover activated carbon particles in flue gas through the electrostatic field, the vibrator and the spiral plate structure, reduce the loss of activated carbon and increase economic benefits; 3. The catalyst spraying device of the recovery box can repair the active sites on the surface of activated carbon lost due to reaction, prolonging the service life of activated carbon particles. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application; Figure 2 is a schematic diagram of the structure of the embodiment of the present application, mainly embodying the first flue and the second flue; Figure 3 is Figure 2 a local enlarged schematic diagram of part A of Figure 4 is a schematic diagram of the structure of the embodiment of the present application, mainly embodying the first spiral plate, the first spiral cover and the first side plate; Figure 5 is a schematic diagram of the structure of the embodiment of the present application, mainly embodying the first vibrator, the telescopic motor and the baffle; Figure 6 is a schematic diagram of the structure of the embodiment of the present application, mainly embodying the second spiral plate, the first spiral cover and the second side plate Figure 7 is a schematic diagram of the structure of the embodiment of the present application, mainly embodying the smoke port; Figure 8 is a schematic diagram of the structure of the embodiment of the present application, mainly embodying the deflector.
[0025] Description of the drawings: 1. Adsorption tower; 2. Desorption tower; 3. Chimney; 4. Partition; 5. First flue; 6. Second flue; 7. First spiral groove; 8. First vibration spring; 9. First spiral plate; 10. First plug-in board; 11. First spiral cover; 12. First vibrator; 13. Smoke guide plate; 14. Telescopic motor; 15. Baffle; 16. Second spiral groove; 17. Second vibration spring; 18. Second spiral plate; 19. Second side plate; 20. Second plug-in board; 21. Bracket plate; 22. Auxiliary electrode plate; 23. Third plug-in board; 24. Second spiral cover; 25. Second vibrator; 26. Driving battery; 27. Smoke outlet; 28. Guide fan; 29. Air outlet pipe; 30. Recovery box; 31. Guide plate; 32. Ultrasonic vibrator; 33. Liquid storage tank; 34. Spray pump; 35. Spray head; 36. First side plate. DETAILED DESCRIPTION
[0026] The following is combined with Figure 1 -Attached Figure 8 , further details of this application are given.
[0027] Flue gas denitrification and desulfurization integrated equipment based on active molecular catalytic technology, refer to Figure 1 , including an adsorption tower 1 and a decomposition tower 2. The decomposition tower 2 is provided with a carbon recovery device, wherein the carbon recovery device is used to recover the activated carbon particles that are flushed into powder by the flue gas in the adsorption tower 1, thereby increasing economic benefits by reducing the loss of activated carbon particles.
[0028] The flue gas generated by combustion enters the adsorption tower 1 through a pipeline, wherein an activated carbon moving bed is provided in the adsorption tower 1, and activated carbon plates are provided in the activated carbon moving bed. The flue gas passes into the activated carbon moving bed and is in full countercurrent contact with the activated carbon plates inside it. The SO2 in the flue gas is oxidized to SO3 on the microporous surface of the activated carbon. In addition, the adsorption tower 1 is connected to a first spray pipe (not shown in the figure) at the flue gas inlet. The spray pipe sprays water mist toward this part of the flue gas. SO3 combines with H2O to generate H2SO4 and is stored in the pores of the activated carbon plates to remove SO2 in the flue gas. At the same time, the adsorption tower 1 is provided with a second spray pipe (not shown in the figure) above the first spray pipe, and the second spray pipe sprays NH3 into the adsorption tower 1. In addition, the adsorption tower 1 is provided with a heating device (not shown in the figure), which increases the internal temperature and stabilizes it at 120°C-200°C through the heating device, thereby promoting the reaction of NH3 with NOx (nitrogen oxides) in the flue gas to generate N2 and H2O, thereby removing NOx (nitrogen oxides) in the flue gas.
[0029] Reference Figure 2 The carbon recovery device includes an annular chimney 3 sleeved outside the decomposition tower 2, and an annular partition 4 is fixedly connected to the inside of the chimney 3. The partition 4 divides the inside of the chimney 3 and forms two annular first flues 5 and second flues 6.
[0030] Reference Figure 3 、 Figure 4 、 Figure 5 The first flue 5 has first spiral grooves 7 formed on the inner walls on both sides thereof. The base radius of the first spiral grooves 7 on the inner wall of the chimney 3 is greater than the base radius of the first spiral grooves 7 on the outer surface of the partition 4. The helical angle a1 of the two first spiral grooves 7 is 20°. A plurality of first vibration springs 8 are fixedly connected to the inner walls on both sides of the first spiral grooves 7. In addition, a first spiral plate 9 is slidably connected to the first spiral groove 7, wherein the helical angle a of the first spiral plate 9 is 20°. The first side plates 36 are fixedly connected to both sides of the first spiral plate 9 in the chimney 3. The first side plates 36 abut against the inner wall of the adjacent first flue 5 and cover the first spiral grooves 7. Furthermore, the first side plate 36 is fixedly connected to a first plug-in plate 10 away from the first spiral plate 9. The first plug-in plate 10 extends into the first spiral groove 7, and both ends of the first plug-in plate 10 are fixedly connected to the ends of the first vibration spring 8 on the inner wall of the adjacent first spiral groove 7. This allows the first spiral plate 9 to slide vertically downward within the chimney 3, and during this process, the first side plate 36 always covers the first spiral groove 7. At the same time, a first spiral cover 11 is fixedly connected to the first side plate 36, which cooperates with the first side plate 36 and the first spiral plate 9 to control the flow direction of the smoke.
[0031] A first vibrator 12 is fixedly connected to the inner bottom surface of the chimney 3, and the first vibrator 12 is connected to the first spiral plate 9 through a vibration conduction rod of the first vibrator 12, and the vibration conduction rod is made of insulating material, so that the vibration generated by the first vibrator 12 can be transmitted to the first spiral plate 9, and the vibration frequency of the first vibrator 12 is 55Hz.
[0032] After being treated in the adsorption tower 1, the flue gas passes through a pipe that sequentially penetrates the side wall of the chimney 3 and the first screw cover 11, and contacts the first spiral plate 9 and the first side plate 36. The pipe is slidably connected to the first screw cover 11. The partition 4 is provided with an opening connecting the first flue 5 and the second flue 6 near the upper end surface of the chimney 3 and the first spiral plate 9. A smoke guide plate 13 for controlling the direction of the flue gas is fixedly connected to the opening of the first flue 5 and the second flue 6, so that the flue gas in the first flue 5 can flow through the opening along the smoke guide plate 13 and into the second flue 6.
[0033] The baffle plate 4 is fixedly connected with the telescopic motor 14, the driving rod of the telescopic motor 14 penetrates through the first spiral plate 9, and the end portion is fixedly connected with the baffle plate 15, and the baffle plate 15 is arranged on the opening. At the same time, the inner wall of the smoke drum 3 is fixedly connected with the first flow meter at the pipeline connection, and the inner wall of the baffle plate 4 is fixedly connected with the second flow meter at the opening. The first flow meter is used for monitoring the smoke flow entering the first flue 5 in real time, and the second flow meter is used for monitoring the smoke flow entering the second flue 6. The outer wall of the smoke drum 3 is provided with a control panel, and the control panel is electrically connected with the first flow meter, the second flow meter and the telescopic motor 14. The driving rod of the telescopic motor 14 is controlled by the control panel, so that the closing degree of the baffle plate 15 on the opening is controlled, and the flow ratio of the smoke flow detected by the first flow meter and the smoke flow detected by the second flow meter is 1:1.3. The smoke flow is dynamically distributed to ensure the residence time of the smoke on the first spiral plate 9.
[0034] Referring to Figure 3 , the inner walls opposite to each other on both sides of the second flue 6 are provided with second spiral grooves 16, the base circle radius of the second spiral grooves 16 in the inner wall of the baffle plate 4 is greater than that of the second spiral grooves 16 in the inner wall of the smoke drum 3 close to the analytical tower 2, and the helix rise angle b1 of the second spiral grooves 16 is 35°. The opposite inner walls in the second spiral grooves 16 are fixedly connected with a plurality of second vibration springs 17.
[0035] Referring to Figure 3 , Figure 6 , the second spiral grooves 16 in the baffle plate 4 are slidably connected with the second spiral plate 18, wherein the helix rise angle b of the second spiral plate 18 is 35°, and the second spiral plate 18 is fixedly connected with the second side plate 19 on both sides in the smoke drum 3. The second side plate 19 abuts against the inner wall of the baffle plate 4, and at the same time, the second side plate 19 is arranged on the second spiral groove 16 in the baffle plate 4. The outer surface of the second spiral plate 18 close to the second side plate 19 of the baffle plate 4 is fixedly connected with the second plug-in plate 20, the second plug-in plate 20 extends into the second spiral groove 16 in the baffle plate 4, and the two ends of the second plug-in plate 20 are fixedly connected with the second vibration spring 17 on the inner wall of the adjacent second spiral groove 16. Thus, the second spiral plate 18 can slide up and down along the vertical direction of the smoke drum 3 in the smoke drum 3, and the second side plate 19 is always arranged on the second spiral groove 16 in the process. The smoke flowing into the second flue 6 cooperates with the smoke guide plate 13 in the second flue 6, so that it flows into the second spiral plate 18.
[0036] The outer surface of the second spiral plate 18 away from the second side plate 19 of the partition plate 4 is fixedly connected with a support plate 21, and the support plate 21 is made of insulating material. An end of the support plate 21 away from the partition plate 4 is fixedly connected with an auxiliary electrode plate 22 parallel to the second side plate 19. The auxiliary electrode plate 22 is connected to the side plate through a wire, and the distance between the two is 5-10 mm. The auxiliary electrode plate 22 is fixedly connected with a third plug-in plate 23, which extends into the second spiral groove 16 of the inner wall of the smokestack 3 near the analytical tower 2 and is fixedly connected with the second vibration spring 17 in the second spiral groove 16. At the same time, the auxiliary electrode plate 22 and the second side plate 19 are fixedly connected with a second spiral cover 24, which cooperates with the auxiliary electrode plate 22 and the second side plate 19 to control the flow direction of flue gas.
[0037] Referring to Figure 3 , Figure 5 , Figure 6 The bottom surface inside the smokestack 3 is fixedly connected with a second vibrator 25, and the second vibrator 25 is connected to the second spiral plate 18 through a vibration transmission rod of the second vibrator 25. The vibration transmission rod is made of insulating material, so that the vibration generated by the second vibrator 25 can be transmitted to the second spiral plate 18. The vibration frequency of the second vibrator 25 is 85 Hz, and the vibration direction of the second vibrator 25 is opposite to that of the first vibrator 12, so as to avoid the vibration frequency of the first spiral plate 9 being the same as that of the second spiral plate 18. In addition, the vibration can improve the friction efficiency of activated carbon particles in flue gas.
[0038] The first spiral plate 9 and the first side plate 36 can be made of 6061 aluminum alloy material, the second spiral plate 18 and the second side plate 19 can be made of TA2 titanium alloy, and the auxiliary electrode plate 22 can be made of titanium metal. The surfaces of the three are coated with a ceramic-graphene composite coating, the coating thickness is 0.2-0.5 mm, and the friction coefficient is ≤0.15. In this way, the low-friction coating reduces the catalyst falling off the surface of the activated carbon particles when the activated carbon particles in the flue gas collide with the surfaces of the first spiral plate 9, the second spiral plate 18 and the auxiliary electrode plate 22.
[0039] The surface of the chimney 3 is fixedly connected with a driving battery 26 capable of outputting 12kV voltage. The positive pole of the driving battery 26 is connected with the first spiral plate 9 through a wire, and the negative pole of the driving battery 26 is connected with the second spiral plate 18 through a wire, so as to form a 10kV / cm electrostatic field radially inward between the first side plate 36 of the first spiral plate 9 and the second side plate 19 of the second spiral plate 18. In this way, the activated carbon particles in the flue gas in the first flue 5 are adsorbed on the surface of the first side plate 36 close to the baffle 4, and continuously vibrate under the action of the first vibrator 12, so that the activated carbon particles on the surface gradually move along the first spiral plate 9 to the bottom surface of the chimney 3 under the action of gravity, and the activated carbon particles adsorbed on the second side plate 19 close to the auxiliary electrode plate 22 in the second flue 6 move in the same direction as the activated carbon particles on the first side plate 36.
[0040] Table 1 is the experimental data of the vibration frequency and recovery rate of the first spiral plate 9 and the second spiral plate 18. Experimental group Electrostatic field Vibration frequency (Hz) a-b Recovery rate Control group 1 None Single 70 Hz 0° 80.1％ Control group 2 10 kV / cm 55 Hz / 55 Hz 15° 83.7％ The present invention 10 kV / cm 55 Hz / 85 Hz 15° 95.8％
[0041] Table 1 The auxiliary electrode plate 22 is connected with the negative pole of the driving battery 26 through a wire together with the second spiral plate 18, so that they are in the same potential state. Since the distance between the auxiliary electrode plate 22 and the second spiral plate 18 is 5-10mm, a high gradient electric field area (second electric field) is formed between them, and the electric field strength of the area can reach 1.5-2 times of that of the main electric field, so as to significantly improve the capture efficiency of the micro fine particles by enhancing the dielectrophoresis force.
[0042] Referring to Figure 3 , Figure 6 , Figure 7 The inner wall of the chimney 3, the second side plate 19 away from the baffle 4, and the auxiliary electrode plate 22 close to the bottom surface are provided with a smoke outlet 27 communicating with the analysis tower 2, so that the flue gas entering the second flue 6 can flow into the analysis tower 2 through the smoke outlet 27. In addition, the outer surface of the chimney 3 is fixedly connected with a guide fan 28, the guide fan 28 is connected with an air outlet pipe 29, the air outlet pipe 29 penetrates the upper end surface of the chimney 3 and extends into the second flue 6, spirally winds along the inner wall of the second flue baffle 4, penetrates the second spiral cover 24, and is provided with an air outlet at the smoke outlet 27, and the air outlet is opposite to the smoke outlet 27, so that the airflow generated by the guide fan 28 can carry the flue gas from the smoke outlet 27 into the analysis tower 2.
[0043] Referring to Figure 3 , Figure 8The outer bottom surface of the flue 3 is fixedly connected with a recovery box 30, and the bottom surface of the flue 3 is provided with an opening for the first spiral plate 9, the second spiral plate 18 and the support plate 21 to extend into the recovery box 30, and the recovery box 30 is provided with a box door for opening. In addition, the recovery box 30 is fixedly connected with a flow guide plate 31, and the horizontal included angle between the flow guide plate 31 and the recovery box 30 is 45°. The part of the first spiral plate 9, the second spiral plate 18 and the support plate 21 in the recovery box 30 extends into the flow guide plate 31. The end of the flow guide plate 31 is fixedly connected with an ultrasonic vibrator 32, wherein the ultrasonic frequency of the ultrasonic vibrator 32 is 28 kHz. At this frequency, the size of the cavitation bubble is about 120 μm, which resonates with the activated carbon particles of 100-150 μm, efficiently destroys the hydrogen bond of the agglomerates, and at the same time, the intermittent working cycle (open 120 s / stop 30 s) can ensure that the 120 s continuous ultrasonic establishes a steady-state sound pressure field, completely disperses the lumps, and the 30 s stop period makes the particles fully settle on the flow guide plate 31, avoiding excessive dispersion from being taken away by the airflow.
[0044] The recovery box 30 is provided with a catalyst supplement spraying device, and the catalyst supplement spraying device comprises a liquid storage tank 33, a spraying pump 34 and a spraying head 35. The liquid storage tank 33 stores nano TiO2 sol with a sol particle size of 50-100 nm and is fixedly connected in the recovery box 30. The spraying pump 34 is in communication with the liquid storage tank 33 through a pipeline, and the spraying head 35 is fixedly connected to the inner side wall of the recovery box 30. The spraying pump 34 drives the TiO2 sol in the liquid storage tank 33 to be sprayed on the activated carbon particles in the recovery box 30 through the spraying head 35, so as to repair the activity of the activated carbon particles, thereby promoting the regeneration rate of the activated carbon particles.
[0045] The implementation principle of the embodiment of the present application is that the device takes "adsorption-catalytic reaction-activated carbon recovery and regeneration" as the core process, removes SO2 and NO x in flue gas through the adsorption tower 1, simultaneously realizes efficient recovery and regeneration of activated carbon particles by using the carbon recovery device, and finally forms an integrated system of "denitration and desulfurization-activated carbon recycling", which significantly reduces the operation cost and improves the treatment efficiency.
[0046] Firstly, the flue gas first enters the adsorption tower 1 and fully contacts with the internally countercurrently arranged activated carbon moving bed to complete the simultaneous removal of SO2 and NO x . The first spraying pipe is arranged at the flue gas inlet of the adsorption tower 1, the spraying water mist combines with SO3 (generated by the oxidation of SO2 on the surface of the activated carbon micropore) in the flue gas to form H2SO4, which is stored in the activated carbon pores to realize the chemical adsorption of SO2. The heating device is arranged in the adsorption tower 1 to stabilize the temperature at 120-200 ℃ (the best interval of activated molecular catalysis), NH3 is sprayed through the second spraying pipe, and NH3 reacts with NO xA selective catalytic reduction (SCR) reaction occurs, generating harmless N2 and H2O. During this stage, the activated carbon acts as a carrier, simultaneously loading both the SO2 oxidation catalyst and the SCR denitrification catalyst, achieving efficient and synergistic removal of flue gas pollutants.
[0047] Then, the flue gas (including the detached activated carbon powder particles) treated by the adsorption tower 1 enters the annular chimney 3. The chimney 3 is mounted outside the adsorption tower 1, and the interior is divided into a first flue 5 (near the adsorption tower 1 side) and a second flue 6 (near the desorption tower 2 side) by an annular partition 4. An adjustable opening is provided near the top of the partition 4, and the flow ratio of the two flues is dynamically adjusted to 1:1.2-1.5 by the telescopic motor 14 and the baffle 15, thereby increasing the residence time of the flue gas in the first flue 5. The flue gas enters the first flue 5 tangentially through the pipe, ensuring that the flue gas flows along the tangential direction of the spiral plate, thereby increasing the probability of collision between the particles and the spiral plate.
[0048] The inner wall of the first flue 5 is slidably connected to the first spiral plate 9 (spiral angle a = 20°, vibration frequency 55Hz), and the first side plates 36 on both sides thereof cover the spiral grooves, allowing only particles to slide along the spiral plate surface. The driving battery 26 forms a radially inward 10kV / cm electrostatic field between the first spiral plate 9 and the first side plate 36, prompting the activated carbon particles to be adsorbed on the surface of the first side plate 36. At the same time, the first vibrator 12 drives the first spiral plate 9 to vibrate at a high frequency through the insulating conductive rod. On the one hand, it destroys the adhesion between the particles and the spiral plate, and on the other hand, it causes the particles to move along the spiral plate surface toward the bottom of the chimney 3 under the action of their own weight and vibration, thereby achieving preliminary collection.
[0049] The inner wall of the second flue 6 is slidably connected to the second spiral plate 18 (spiral angle b = 35°, vibration frequency 85Hz), whose vibration direction is opposite to that of the first spiral plate 9, and the vibration frequency difference is 30Hz. The second spiral plate 18 forms a high-gradient electric field region through the auxiliary electrode plate 22, significantly enhancing the dielectrophoretic force and efficiently capturing activated carbon particles with smaller particle size (≤10μm) in the flue gas. The second vibrator 25 synchronously drives the second spiral plate 18 to vibrate, promoting the aggregation of particles to the bottom.
[0050] In addition, the first flow meter and the second flow meter provide real-time feedback to the control panel, and the opening of the baffle 15 is adjusted by the telescopic motor 14 to ensure that the flow ratio of the two flues is stable at 1:1.3, which not only ensures that the particles in the first flue 5 are fully retained, but also prevents the particles in the second flue 6 from entering the desorption tower 2 without being completely captured due to excessive flow.
[0051] The activated carbon particles collected by the first and second spiral plates 18 fall into the recovery tank 30, the recovery tank 30 is provided with an inclined guide plate 31, and the end is connected with an ultrasonic vibrator 32, so that the channel can be effectively prevented from being blocked. A catalyst supplementing device is arranged at the top of the recovery tank 30, and nano TiO2 sol with a particle size of 50-100 nm is sprayed to the particles, so that the active sites lost on the surface of the activated carbon due to the reaction can be repaired, and the service life of the activated carbon particles can be prolonged.
[0052] The embodiments of the specific embodiment are the preferred embodiments of the application, and are not limited to the protection scope of the application, wherein the same parts are indicated by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.
Claims
1. An integrated flue gas denitrification and desulfurization device based on active molecular catalysis technology comprises an adsorption tower (1), wherein the adsorption tower (1) is connected to a desorption tower (2) via a pipeline, and is characterized in that: The analytical tower (2) is provided with a carbon recovery device; The carbon recovery device comprises: An annular chimney (3) is connected to the adsorption tower (1) via a pipe. The chimney (3) is sleeved outside the adsorption sleeve. An annular partition (4) is fixedly connected inside the chimney (3). The partition (4) divides the interior of the chimney (3) into a first flue (5) and a second flue (6). The inner wall of the first flue (5) is slidably connected to a first spiral plate (9), the spiral angle a of the first spiral plate (9) is between 15° and 25°, and the partition (4) is provided with an opening near the first spiral plate (9) and the top of the chimney (3); The inner wall of the second flue (6) is slidably connected to a second spiral plate (18), the spiral angle b of the second spiral plate (18) is between 30° and 45°, and ab=15°, and the second flue (6) is provided with a smoke outlet (27) connected to the analytical tower (2); A driving battery (26) is connected to the chimney (3), wherein the positive electrode of the driving battery (26) is connected to the first spiral plate (9), and the negative electrode is connected to the second spiral plate (18), thereby forming a radially inward electrostatic field with an electrostatic field strength of 8-12 kV / cm; Two vibration generators are connected to the first spiral plate (9) and the second spiral plate (18) respectively, the vibration frequency of the first spiral plate (9) is 50-60 Hz, and the vibration frequency of the second spiral plate (18) is 80-90 Hz; A recovery box (30) is connected to the chimney (3), and the first spiral plate (9) and the second spiral plate (18) extend into the recovery box (30).
2. The integrated flue gas denitrification and desulfurization equipment based on active molecular catalysis technology according to claim 1 is characterized in that: The vibration frequency difference between the first spiral plate (9) and the second spiral plate (18) is 30±5 Hz, and the vibration directions of the two are opposite.
3. The integrated flue gas denitrification and desulfurization equipment based on active molecular catalysis technology according to claim 1 is characterized in that: The negative pole of the driving battery (26) is extended and connected to an auxiliary electrode plate (22), and the auxiliary electrode plate (22) is arranged in parallel on the side of the second spiral plate (18) away from the partition (4), and the distance between the auxiliary electrode plate (22) and the second spiral plate (18) is 5-10 mm.
4. The integrated flue gas denitrification and desulfurization equipment based on active molecular catalysis technology according to claim 1 is characterized in that: The surfaces of the first spiral plate (9) and the second spiral plate (18) are covered with a ceramic-graphene composite coating with a coating thickness of 0.2-0.5 mm and a friction coefficient of ≤0.
15.
5. The integrated flue gas denitrification and desulfurization equipment based on active molecular catalysis technology according to claim 1 is characterized in that: An inclined guide plate (31) is provided in the recovery box (30), wherein the angle between the guide plate (31) and the horizontal plane is 40°-50°, and the end of the guide plate (31) is connected to an ultrasonic vibrator (32), and the ultrasonic frequency is 25-30kHz.
6. The integrated flue gas denitrification and desulfurization equipment based on active molecular catalysis technology according to claim 1 is characterized in that: An adjustable baffle (15) is provided at the opening of the partition (4), and the opening of the baffle (15) is controlled in conjunction with the flue gas flow rate, so that the flow ratio of the first flue (5) to the second flue (6) is 1:(1.2-1.5).
7. The integrated flue gas denitrification and desulfurization equipment based on active molecular catalysis technology according to claim 1 is characterized in that: The recovery box (30) is connected to a catalyst supplementary spraying device, and the supplementary spraying device sprays nano-TiO2 sol into the recovery box (30), and the sol particle size is 50-100nm.
8. The integrated flue gas denitrification and desulfurization equipment based on active molecular catalysis technology according to claim 1 is characterized in that: The chimney (3) is connected to a guide fan (28), an air outlet pipe (29) of the guide fan (28) extends into the second flue (6), and the air flow generated by the fan flows along the second spiral plate (18) toward the analysis tower (2).
9. The integrated flue gas denitrification and desulfurization equipment based on active molecular catalysis technology according to claim 1 is characterized in that: The electrostatic field intensity is 10 kV / cm, the vibration frequency of the first spiral plate (9) is 55 Hz, and the vibration frequency of the second spiral plate (18) is 85 Hz.