Flue gas treatment equipment with low-temperature SCR (Selective Catalytic Reduction) denitration function

Abstract

The invention discloses flue gas treatment equipment with a low-temperature SCR denitration function, and relates to the technical field of flue gas treatment, the flue gas treatment equipment comprises a gas inlet pipe, a mixing pipe, a rectifying pipe and an SCR catalytic reaction pipe, flue gas flows in through the gas inlet pipe, sequentially flows through the mixing pipe, the rectifying pipe and the SCR catalytic reaction pipe, and flows out through the bottom of the SCR catalytic reaction pipe. A large number of bubbles are blown out through the bubble machine, the central rotating shaft is driven to rotate through the first driving device, the vertical rods and the bubble machine on the vertical rods are driven to rotate together, dust particles carried in smoke flowing into the air inlet pipe can be attached to the surfaces of the bubbles and flow along with the smoke, and therefore the dust particles are prevented from falling off. The bubbles and dust particles adhered to the bubbles are adsorbed through the adsorption assembly, so that the problems of smoke heat loss, temperature reduction, energy waste and influence on the catalytic reaction effect caused by adsorption treatment of smoke by adopting filtered water are avoided, and the problem that a large amount of energy needs to be consumed in the subsequent heating process is avoided.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology, and specifically to a flue gas treatment device with low-temperature SCR denitrification function. Background Technology

[0002] SCR (Selective Catalytic Reduction) denitrification is currently the preferred method for removing nitrogen oxides (NOx) from industrial flue gas (thermal power, steel, cement, chemical, etc.). x The mainstream technology for NO treatment primarily involves using reducing agents (ammonia, urea, liquid ammonia) under the action of a catalyst to selectively remove NO. x Reducing to nitrogen and water, the denitrification efficiency can reach 85%-98%, meeting ultra-low emission requirements (NOx). x <35mg / m³).

[0003] A search revealed Chinese Patent Publication No. CN222239327U, which discloses a flue gas treatment device with low-temperature SCR denitrification function. The device includes a flue gas treatment chamber, an inlet pipe fixedly connected to the left side of the chamber, a debris collection frame placed near the bottom left side of the chamber, a water inlet pipe fixedly installed on the front side of the chamber, a sealing partition fixedly connected to the inner wall of the chamber, a water filter plate fixedly connected to the left side of the sealing partition, an exhaust pipe fixedly connected to the right side of the sealing partition, and an SCR denitrification catalyst fixedly installed near the middle of the inner wall of the chamber. This invention, through the combination of the above structures, achieves the removal of particulate impurities from the flue gas by first adsorbing water through the flue gas treatment chamber, followed by desulfurization and purification filtration through the SCR denitrification catalyst and multi-layer filter frame. This achieves triple filtration of the flue gas, including sequential adsorption, SCR denitrification, and filtration. However, this technical solution has the following problems in actual operation: When using SCR denitrification technology to treat flue gas, there are strict requirements on the flue gas temperature. Considering the activity requirements of the catalyst, the current mainstream SCR denitrification treatment generally requires a flue gas temperature of 280-420 degrees Celsius. However, the aforementioned technical solutions use water combined with an adsorbent to filter the flue gas. While the water filter adsorbs particulate matter from the flue gas, it also undergoes significant heat exchange with the high-temperature flue gas, causing the flue gas temperature to drop rapidly. Furthermore, as filtration continues, saturated filtered water needs to be discharged and replenished, further accelerating heat loss and temperature reduction. This technical solution not only wastes energy but also affects the catalytic conversion rate of nitrogen oxides during the subsequent SCR catalytic treatment, resulting in poor nitrogen oxide treatment efficiency. To ensure catalytic conversion, the flue gas needs to be heated before the catalytic reaction. Since water filtration significantly lowers the flue gas temperature, the heating process consumes a large amount of energy. Therefore, this application proposes a flue gas treatment device with low-temperature SCR denitrification function to solve the above problems. Summary of the Invention

[0004] This invention provides a flue gas treatment device with low-temperature SCR denitrification function to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A flue gas treatment device with low-temperature SCR denitrification function includes an inlet pipe, a mixing pipe, a rectifier pipe, and an SCR catalytic reaction pipe. Flue gas flows in through the inlet pipe and sequentially passes through the mixing pipe, the rectifier pipe, and the SCR catalytic reaction pipe, and flows out through the bottom of the SCR catalytic reaction pipe. A central rotating shaft is movably connected to the inner wall of the mixing pipe. The bottom and top of the central rotating shaft are fixedly connected to annular connecting rods through multiple connecting rods. Multiple vertical rods are fixedly connected between two annular connecting rods, and multiple bubble machines for making bubbles are installed on each vertical rod.

[0006] An adsorption component is movably connected to the inner wall of the air intake pipe on the side away from the flue gas intake.

[0007] The mixing pipe is equipped with an ammonia spraying mechanism, which ensures that the flue gas flowing out of the air inlet pipe and the ammonia gas are fully mixed.

[0008] A further improvement of the technical solution of the present invention is that: the connecting rod and the annular connecting rod at the top, the central rotating shaft, the vertical rod, and the internal connections of multiple bubble machines are connected; the end of the central rotating shaft extending to the outside of the air inlet pipe is movably connected to a rotating cover plate; the rotating cover plate is fixedly connected to the air inlet pipe; and a liquid pipe is fixedly connected to the rotating cover plate.

[0009] A further improvement of the technical solution of the present invention is that: the adsorption assembly includes multiple mounting slots opened at the top of the air inlet pipe, a sealing cover plate is movably connected to the inner wall of the mounting slot, an adsorption plate is fixedly connected to the bottom of the sealing cover plate, and multiple through holes are opened on the adsorption plate.

[0010] A further improvement of the technical solution of the present invention is that: multiple conical cylinders are fixedly connected to the adsorption plate, and the tips of the conical cylinders face in the opposite direction to the flue gas.

[0011] A further improvement of the technical solution of the present invention is that: multiple adsorption components are provided, and the multiple adsorption components are arranged alternately.

[0012] A further improvement of the technical solution of the present invention is that: the ammonia spraying mechanism includes multiple sets of hollow rotating shafts and connecting rotating shafts movably connected to the inner wall of the mixing pipe, and two spray pipes are fixedly connected between each set of hollow rotating shafts and connecting rotating shafts, with the two spray pipes arranged symmetrically about the center of the hollow rotating shafts and connecting rotating shafts.

[0013] The same set of hollow rotating shafts, one end of two spray pipes connected on the connecting shaft extends into the interior of the hollow rotating shaft, and a connecting pipe is fixedly connected to the inner wall of the hollow rotating shaft. One end of the connecting pipe inside the hollow rotating shaft is connected to one end of the two spray pipes, and the other end of the connecting pipe extends to the outside of the mixing pipe.

[0014] A further improvement of the technical solution of the present invention is that: one end of each of the multiple connecting pipes extending to the outside of the mixing pipe is movably connected to an inlet pipe, and the inlet pipe is fixedly connected to the outer wall of the mixing pipe by a mounting retainer.

[0015] A further improvement of the technical solution of the present invention is that: each set of hollow rotating shafts and the bottom of the connecting rotating shafts are movably connected to soaking boxes, and both ends of the soaking boxes are fixedly connected to liquid tubes II, and one end of each liquid tube II extending to the outside of the mixing tube is fixedly connected to a connecting pipe.

[0016] When the hollow rotating shaft and the connecting rotating shaft drive the two spray pipes to rotate to the vertical spray direction, the spray pipe at the bottom is in the soaking box.

[0017] A further improvement of the technical solution of the present invention is that: two sliding columns are fixedly connected to the bottom of the soaking box, and a mounting seat is movably connected to the outer circumference of each sliding column. The mounting seat is fixedly connected to the inner wall of the mixing tube. A spring is sleeved on the outer surface of the sliding column at the top of the mounting seat, and a limit plate is fixedly connected to one end of the sliding column at the bottom of the mounting seat.

[0018] A further improvement of the technical solution of the present invention is that: a rotating block is fixedly connected to the outer surface of the hollow rotating shaft and the connecting rotating shaft, and when the two spray pipes are in a vertical state, the rotating block abuts against the upper surfaces of both ends of the soaking box.

[0019] The hollow rotating shaft and the connecting shaft drive the two spray pipes to rotate. The rotating block exerts a downward pressure on the soaking box. The downward pressure distance and the width of the soaking box meet the requirements so that the spray pipes do not come into contact with the sides of the soaking box when they rotate.

[0020] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows: 1. This invention provides a flue gas treatment device with low-temperature SCR denitrification function. First, a large number of bubbles are blown out by a bubble machine, and the central shaft is driven to rotate by a drive device, which drives the vertical rod and the bubble machine on it to rotate together. The dust particles carried in the flue gas flowing in from the air inlet pipe will adhere to the surface of the bubbles and flow with the flue gas. The adsorption component adsorbs the bubbles and the dust particles adhering to the bubbles, avoiding the problems of heat loss and temperature drop caused by using filtered water to adsorb the flue gas, resulting in energy waste and affecting the catalytic reaction effect, as well as avoiding the problem of large energy consumption in the subsequent heating process.

[0021] 2. This invention provides a flue gas treatment device with low-temperature SCR denitrification function. If one of the spray pipes has been blocked by crystals, the blocked spray pipe is rotated into the soaking box and soaked in the cleaning solution. The cleaning solution can react and remove the crystals in the spray pipe orifice, ensuring that the subsequent use of the spray pipe is not affected.

[0022] 3. This invention provides a flue gas treatment device with low-temperature SCR denitrification function. If the spray pipe is not blocked by crystallization, the spray pipe is placed in the soaking box and immersed in the cleaning solution. Due to the alkaline corrosion of ammonia water and the synergistic corrosion effect of acidic gases such as SO2, SO3, and HCl contained in the flue gas, the service life of the spray pipe will be affected. Immersing the spray pipe in the cleaning solution can play a certain protective role. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a structural schematic diagram of the present invention from another angle; Figure 3 This is a schematic cross-sectional view of the intake pipe of the present invention; Figure 4 This is a cross-sectional structural diagram of the connection between the central rotating shaft, connecting rod, vertical rod, annular connecting rod, and rotating cover plate of the present invention. Figure 5 This is a schematic diagram of the adsorption component of the present invention; Figure 6 This is a schematic diagram of the through hole structure of the present invention; Figure 7This is a schematic diagram of the ammonia spraying mechanism of the present invention; Figure 8 This is a schematic diagram of the structure of the spray pipe of the present invention in the soaking box; Figure 9 This is a schematic diagram of the spray pipe of the present invention in a horizontal state; Figure 10 This is a schematic diagram of the connection between the connecting pipe and the spray pipe of the present invention; Figure 11 This is a schematic diagram of the structure connecting the spray pipe, the hollow rotating shaft, and the connecting shaft of the present invention. Figure 12 This is a schematic diagram of the soaking box of the present invention.

[0024] In the diagram: 1. Inlet pipe; 2. Mixing pipe; 3. Rectifier pipe; 4. SCR catalytic reaction pipe; 5. Central rotating shaft; 6. Connecting rod; 7. Vertical rod; 8. Bubble machine; 9. Annular connecting rod; 10. Rotating cover plate; 11. Liquid pipe one; 12. Drive device one; 13. Mounting groove; 14. Sealing cover plate; 15. Adsorption plate; 16. Conical cylinder; 17. Through hole; 18. Pull ring; 19. Liquid inlet pipe one; 20. Mounting retaining ring; 21. Connecting pipe; 22. Hollow rotating shaft; 23. Spray pipe; 24. Valve; 25. Connecting rotating shaft; 26. Drive device two; 27. Mounting bracket; 28. Rotating lever; 29. ​​Immersion box; 30. Liquid pipe two; 31. Connecting pipe; 32. Sliding column; 33. Mounting base; 34. Spring; 35. Limiting plate. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to embodiments: Example

[0026] like Figure 1-12As shown, this invention provides a flue gas treatment device with low-temperature SCR denitrification function, including an inlet pipe 1, a mixing pipe 2, a rectifier pipe 3, and an SCR catalytic reaction pipe 4. High-speed flue gas flows in through the inlet pipe 1, mixes thoroughly with ammonia in the mixing pipe 2, and then enters the SCR catalytic reaction pipe 4 after passing through the rectifier pipe 3. The SCR catalytic reaction pipe 4 is equipped with a multi-layer mesh reactor composed of SCR catalyst to catalyze the mixture of nitrogen oxides and ammonia, reducing nitrogen oxides to nitrogen and water, so that the nitrogen oxide content in the emitted flue gas meets the emission requirements. A central rotating shaft is movably connected to the inner wall of the mixing pipe 2. 5. A drive device 12 is connected to the outer surface of the central rotating shaft 5 outside the air intake pipe 1. The drive device 12 is existing technology and includes a motor and other structures and related accessories. The bottom and top of the central rotating shaft 5 are fixedly connected to annular connecting rods 9 by multiple connecting rods 6. Multiple vertical rods 7 are fixedly connected between two annular connecting rods 9. Multiple bubble machines 8 for making bubbles are installed on each vertical rod 7. The bubble machine 8 is existing technology. The bubble machine 8 includes a small motor, fan blades, bubble rings and other structures and related accessories. The small motor drives the fan blades to rotate, generating air. Bubbles are blown on the bubble ring by utilizing the surface tension of the bubble water.

[0027] An adsorption component is movably connected to the inner wall of the intake pipe 1 on the side away from the flue gas intake.

[0028] The mixing pipe 2 is equipped with an ammonia spraying mechanism, which ensures that the flue gas flowing out of the air inlet pipe 1 and the ammonia gas are fully mixed.

[0029] It also includes a PLC control system and other related equipment, which are electrically connected to each of the electrical control devices in this application to ensure the real-time performance and accuracy of control commands and to meet the continuous operation requirements of each device in this application.

[0030] First, a large number of bubbles are blown out by the bubble machine 8, and the central shaft 5 is rotated by the drive device 12, which in turn rotates the vertical rod 7 and the bubble machine 8 on it. The dust particles carried in the flue gas flowing in from the air inlet pipe 1 will adhere to the surface of the bubbles and flow with the flue gas. The adsorption component adsorbs the bubbles and the dust particles adhering to the bubbles, avoiding the problems of heat loss and temperature drop caused by using filtered water to adsorb the flue gas, resulting in energy waste and affecting the catalytic reaction effect. It also avoids the problem of large energy consumption in the subsequent heating process. This technical solution also has the following beneficial effects: First, by using bubble adsorption for dust removal, heat loss is minimized, ensuring that the subsequent catalytic treatment of flue gas is not affected, and avoiding the problem of needing to heat the flue gas before the catalytic reaction, which would consume a lot of energy. 2. The bubbles blown by the bubble machine 8 are in a moist state, which has a strong interception, adhesion, wetting and sedimentation effect on dust particles in the flue gas. In addition, the bubble has a large specific surface area, which increases the contact area with the flue gas and further promotes the adsorption and treatment effect of dust in the flue gas. 3. The vertical rod 7 and the bubble machine 8 can rotate along the central rotating shaft 5. Under the action of centrifugal force, the bubbles generated by the bubble machine 8 will be thrown in different directions. Since the direction of the flue gas is fixed, the bubbles can fully contact the dust particles in the flue gas. If the direction of the bubble blowing is consistent with the direction of the flue gas, the bubble will be accelerated by the flue gas and the flow speed will be faster, and it will contact the dust particles in the flue gas in the same direction. At this time, the adsorption efficiency is low. Fourth, when the vertical rod 7 and the bubble machine 8 can rotate along the central rotating shaft 5, the vertical rod 7 and the bubble machine 8 act as a certain stirring structure, so that the flue gas carrying dust particles can come into full contact with the bubbles.

[0031] Furthermore, such as Figure 3-6 As shown, the connecting rod 6 and the annular connecting rod 9 at the top, the central rotating shaft 5, the vertical rod 7, and the multiple bubble machines 8 are internally connected. The end of the central rotating shaft 5 extending to the outside of the air inlet pipe 1 is movably connected to a rotating cover plate 10, ensuring that while the central rotating shaft 5 rotates, bubble liquid can also be introduced into the bubble machine 8 through the liquid pipe 11. The rotating cover plate 10 is fixedly connected to the air inlet pipe 1, and the liquid pipe 11 is fixedly connected to the rotating cover plate 10. The liquid pipe 11 is connected to the external bubble liquid storage tank and the bubble liquid pump. Together with the connecting rod 6 and the annular connecting rod 9 at the top, the central rotating shaft 5, the vertical rod 7, and the multiple bubble machines 8 are internally connected, so that bubble liquid is uniformly provided for the use of the bubble machine 8.

[0032] Furthermore, the adsorption assembly includes multiple mounting slots 13 formed at the top of the air inlet pipe 1. A sealing cover plate 14 is movably connected to the inner wall of the mounting slot 13. A pull ring 18 is fixedly connected to the top of the sealing cover plate 14 to facilitate lifting the adsorption plate 15 for maintenance. The adsorption plate 15 is fixedly connected to the bottom of the sealing cover plate 14. The adsorption plate 15 has multiple through holes 17. The through holes 17 are located inside the adsorption plate 15 and are multi-channel arranged to facilitate the full adsorption of flue gas flowing in through the through holes 17. The filter is attached. The adsorption plate 15 is made of porous adsorption material. The bubbles with adsorbed dust flow with the flue gas to the adsorption component and collide with the adsorption plate 15. The bubbles may break, so that the dust and other particles adhering to the bubbles are attached to the adsorption plate 15. When the flue gas passes through the adsorption plate 15, the adsorption plate 15 will further adsorb the flue gas. It can adsorb the dust in the flue gas and also adsorb the droplets generated by the broken bubbles, so as to ensure that the content of dust particles in the flue gas flowing out of the adsorption component is low.

[0033] Furthermore, multiple conical cylinders 16 are fixedly connected to the adsorption plate 15. The tips of the conical cylinders 16 face the opposite direction to the flue gas flow. The conical cylinders 16 are punctured by the bubbles flowing towards the adsorption plate 15. When the bubbles puncture, the force generated causes the adhesive droplets carrying dust particles to splash onto the conical cylinders 16 and the adsorption plate 15, adhering to them. The adsorption plate 15 and the conical cylinders 16 can be cleaned or replaced periodically to ensure the treatment effect, thereby completing the treatment of the dust-adsorbing bubbles.

[0034] Furthermore, multiple adsorption components are provided, and these components are staggered to provide a flue gas flow channel, thus avoiding a significant impact on the flue gas velocity from the adsorption plate 15. At the same time, the staggered arrangement of the adsorption components ensures that flue gas that has not yet come into contact with the adsorption plate 15 in the previous stage can fully contact the adsorption plate 15 in the next stage. At least three adsorption components are provided to ensure sufficient adsorption treatment of flue gas and adhering dust bubbles, and also to ensure that when one adsorption component is lifted out for maintenance, the other adsorption components can still maintain normal operation.

[0035] Furthermore, such as Figure 7-12 As shown, the ammonia spraying mechanism includes multiple sets of hollow rotating shafts 22 and connecting rotating shafts 25 movably connected to the inner wall of the mixing pipe 2. Each set of hollow rotating shafts 22 and connecting rotating shafts 25 is fixedly connected to two spray pipes 23. The two spray pipes 23 are symmetrically arranged about the center of the hollow rotating shafts 22 and connecting rotating shafts 25. The multiple ammonia spraying mechanisms satisfy the following: when the two spray pipes 23 on all ammonia spraying mechanisms are rotated to the horizontal state, the two adjacent spray pipes 23 will not have any cross-effect. When the two spray pipes 23 located at the edge rotate, they will not come into contact with the inner wall of the mixing pipe 2.

[0036] Two spray pipes 23 connected to the same set of hollow rotating shafts 22 and connecting shafts 25 extend into the interior of the hollow rotating shafts 22. A connecting pipe 21 is fixedly connected to the inner wall of the hollow rotating shafts 22. One end of the connecting pipe 21 inside the hollow rotating shafts 22 is connected to one end of the two spray pipes 23. A valve 24 is movably connected between the connecting pipe 21 and the two spray pipes 23. The valve 24 is existing technology and can be a solenoid valve or other device that can achieve this function. The valve 24 can control whether the ammonia water flows in the two spray pipes 23 respectively. The other end of the connecting pipe 21 extends to the outside of the mixing pipe 2. A second driving device 26 for driving the connecting shafts 25 to rotate is provided outside the mixing pipe 2. The second driving device 26 is installed on the mixing pipe 2 through a mounting bracket 27. The second driving device 26 is existing technology and includes a motor, gears and other equipment and related accessories.

[0037] The valve 24 allows the two spray pipes 23 to operate simultaneously or individually. Ammonia water is introduced through the connecting pipe 21 and distributed to the two spray pipes 23. When the valve 24 is opened, the ammonia water can be sprayed out through the spray pipes 23. Opening different valves 24 can control the opening and closing of the two spray pipes 23, allowing them to be used simultaneously or individually. The flue gas flows from bottom to top. If the two spray pipes 23 are stationary, the sprayed ammonia water flows both upward and downward, allowing the flue gas to fully contact the ammonia. If the two spray pipes 23 rotate with the hollow rotating shaft 22 and the connecting rotating shaft 25, the centrifugal force will expand the diffusion range of the sprayed ammonia, increasing the contact area between the flue gas and ammonia and promoting uniform mixing. At the same time, when the two spray pipes 23 rotate and spray, they act as a stirring structure, further promoting the mixing of flue gas and ammonia.

[0038] Furthermore, each of the multiple connecting pipes 21 extending to the outside of the mixing pipe 2 is movably connected to an inlet pipe 19. The inlet pipe 19 is fixedly connected to the outer wall of the mixing pipe 2 by a mounting ring 20. The inlet pipe 19 is made of a rigid material, and the connection between the connecting pipe 21 and the inlet pipe 19 is also made of a rigid material, ensuring that the connecting pipe 21 can rotate in the inlet pipe 19 and can also supply ammonia water to the connecting pipe 21. One end of the inlet pipe 19 is connected to an external ammonia water pump and ammonia water storage tank to supply sufficient ammonia water to the mixing pipe 2, ensuring that the flue gas can be fully and adequately mixed with the ammonia gas, thus ensuring the treatment effect of the flue gas.

[0039] Since the connecting pipe 21 rotates together with the hollow rotating shaft 22, the spray pipe 23, and the connecting rotating shaft 25, the connection between the connecting pipe 21 and the inlet pipe 19 is a rotating seal connection. This ensures that the rotation of the hollow rotating shaft 22, the spray pipe 23, the connecting rotating shaft 25, and the connecting pipe 21 is not affected, and also allows ammonia water to be supplied to multiple connecting pipes 21 through the inlet pipe 19.

[0040] During actual use, ammonia nozzles may become clogged or scaled. Clogged or scaled nozzles will reduce the nozzle's flow capacity, resulting in uneven ammonia spray and affecting the uniformity of ammonia mixing with flue gas.

[0041] The main reasons for clogging and scaling in ammonia nozzles are: ammonia reacts with sulfur trioxide in flue gas to produce ammonium bisulfate, which crystallizes at low temperatures and clogs the nozzles. Under high-temperature conditions, ammonia partially decomposes into ammonia and water, and may also produce trace amounts of ammonium bicarbonate crystals that adhere to the inner wall of the flow channel. As usage time increases, these crystals gradually form blockages, requiring machine shutdown and cleaning, which affects continuous system operation and significantly increases production costs.

[0042] Furthermore, each hollow rotating shaft 22 and connecting rotating shaft 25 has a corresponding soaking box 29 movably connected to its bottom. When the hollow rotating shaft 22 and connecting rotating shaft 25 drive the two spray pipes 23 to rotate to a vertical spray direction, the spray pipe 23 at the bottom is in the soaking box 29. Both ends of the soaking box 29 are fixedly connected to liquid pipes 30. Each liquid pipe 30 has a connecting pipe 31 fixedly connected to one end extending outside the mixing pipe 2. One connecting pipe 31 is connected to the cleaning liquid and the cleaning liquid pump, and the other connecting pipe 31 is connected to the cleaning liquid waste storage tank. The cleaning solution is recycled for centralized processing. The cleaning solution is a 5%-10% citric acid solution, a weak acid that does not corrode stainless steel or ceramic nozzles. Sufficient cleaning solution is injected into the soaking box 29. The spray pipes 23 are U-shaped and connected to the same hollow rotating shaft 22 and rotating shaft 25. When the spray holes of one spray pipe 23 are vertically upward, the spray holes of the other spray pipe 23 are vertically downward. The horizontal portion of the bottom spray pipe 23 is completely inside the soaking box 29 and submerged in the cleaning solution. This technical solution has the following beneficial effects: 1. If one of the spray pipes 23 has become blocked by crystals, rotate the blocked spray pipe 23 into the soaking box 29 and soak it in the cleaning solution. The cleaning solution can react and remove the crystals in the spray holes of the spray pipe 23, ensuring that the subsequent use of the spray pipe 23 will not be affected. 2. If the spray pipe 23 does not crystallize and become blocked, the spray pipe 23 is placed in the soaking box 29 and immersed in the cleaning solution. Due to the alkaline corrosion of ammonia water and the synergistic corrosion effect of acidic gases such as SO2, SO3, and HCl contained in the flue gas, the service life of the spray pipe 23 will be affected. Immersing the spray pipe 23 in the cleaning solution can play a certain protective role. 3. If one of the spray pipes 23 becomes blocked or cannot be used normally, the hollow rotating shaft 22 and the connecting rotating shaft 25 drive the two spray pipes 23 to rotate, rotate the blocked spray pipe 23 into the soaking box 29, close the valve 24 on the corresponding spray pipe 23, and open the other valve 24 so that the other spray pipe 23 can work, and there will be no interruption of ammonia mixing, which will affect the quality of ammonia and flue gas mixing. Fourth, if the two spray pipes 23 are used alternately, and the frequency of alternation is such that the working time of a single spray pipe 23 is insufficient to cause the spray holes on the spray pipe 23 to become clogged, then the two spray pipes 23 are alternately immersed in the cleaning solution in the immersion box 29, so that the crystals in the spray holes of the spray pipe 23 will not accumulate. This not only reduces the possibility of the spray pipe 23 becoming clogged, but also further extends the service life of the spray pipe 23.

[0043] Furthermore, two sliding pillars 32 are fixedly connected to the bottom of the soaking box 29. Each sliding pillar 32 is movably connected to a mounting base 33 on its outer circumference. The mounting base 33 is fixedly connected to the inner wall of the mixing tube 2. A spring 34 is sleeved on the outer surface of the sliding pillar 32 at the top of the mounting base 33. A limit plate 35 is fixedly connected to one end of the sliding pillar 32 at the bottom of the mounting base 33.

[0044] When the spray pipe 23 rotates inside the soaking box 29, and when the spray pipe 23 abuts against the inner wall of the soaking box 29, the sliding column 32 of the soaking box 29 moves down along the mounting base 33, compressing the spring 34. The downward movement distance of the soaking box 29 satisfies the following conditions: when the spray pipe 23 rotates to abut against the side wall of the soaking box 29, the downward movement distance of the soaking box 29 ensures that the spray pipe 23 will not come into contact with the soaking box 29. After the spray pipe 23 rotates away from the range of the soaking box 29, the soaking box 29 rebounds under the action of the compression spring 34 and returns to its original position, ensuring that subsequent use is not affected.

[0045] Furthermore, a rotating block 28 is fixedly connected to the outer surface of the hollow rotating shaft 22 and the connecting rotating shaft 25. When the two spray pipes 23 are in a vertical state, the rotating block 28 abuts against the upper surfaces of both ends of the soaking box 29.

[0046] The hollow rotating shaft 22 and the connecting rotating shaft 25 drive the two spray pipes 23 to rotate. The rotating block 28 exerts a downward pressure on the soaking box 29. The contact surfaces of the rotating block 28 and the soaking box 29 are both smooth contact surfaces, ensuring the smoothness of the downward pressure exerted on the soaking box 29 when the rotating block 28 rotates. The downward pressure distance and the width of the soaking box 29 are satisfied. The spray pipe 23 does not contact the sides of the soaking box 29 when it rotates. The liquid pipe 20 located inside the mixing pipe 2 is made of elastic and soft material, so that the up and down movement of the soaking box 29 will not affect the input or output of the cleaning liquid in the soaking box 29.

[0047] By setting the above technical solution, the width of the soaking box 29 is made to be at its minimum without affecting the rotation of the spray pipe 23. This avoids the problem that if the soaking box 29 is too wide, a large amount of cleaning solution is needed to submerge the spray pipe 23. At the same time, if the soaking box 29 is too wide, ammonia and other substances sprayed from the spray pipe 23 will fall into the soaking box 29 and react with the weakly acidic cleaning solution in the soaking box 29, resulting in poor cleaning effect and frequent replacement, which would lead to serious waste of cleaning solution.

Claims

1. A flue gas treatment device with low-temperature SCR denitrification function, comprising an inlet pipe (1), a mixing pipe (2), a rectifier pipe (3), and an SCR catalytic reaction pipe (4), wherein flue gas flows in through the inlet pipe (1), flows sequentially through the mixing pipe (2), the rectifier pipe (3), and the SCR catalytic reaction pipe (4), and flows out through the bottom of the SCR catalytic reaction pipe (4), characterized in that: The inner wall of the mixing tube (2) is movably connected to a central rotating shaft (5). The bottom and top of the central rotating shaft (5) are fixedly connected to annular connecting rods (9) through multiple connecting rods (6). Multiple vertical rods (7) are fixedly connected between two annular connecting rods (9). Multiple bubble machines (8) for making bubbles are installed on each vertical rod (7). An adsorption component is movably connected to the inner wall of the air inlet pipe (1) on the side away from the flue gas inlet. The mixing pipe (2) is equipped with an ammonia spraying mechanism, which allows the flue gas flowing out of the air inlet pipe (1) into the mixing pipe (2) to be fully mixed with the ammonia.

2. The flue gas treatment equipment with low-temperature SCR denitrification function according to claim 1, characterized in that: The connecting rod (6) and the ring connecting rod (9) at the top, the central rotating shaft (5), the vertical rod (7), and the multiple bubble machines (8) are internally connected. The central rotating shaft (5) extends to the outside of the air inlet pipe (1) and is movably connected to a rotating cover plate (10). The rotating cover plate (10) is fixedly connected to the air inlet pipe (1), and a liquid pipe (11) is fixedly connected to the rotating cover plate (10).

3. The flue gas treatment equipment with low-temperature SCR denitrification function according to claim 1, characterized in that: The adsorption assembly includes multiple mounting slots (13) opened at the top of the air inlet pipe (1). A sealing cover plate (14) is movably connected to the inner wall of the mounting slot (13). An adsorption plate (15) is fixedly connected to the bottom of the sealing cover plate (14). Multiple through holes (17) are opened on the adsorption plate (15).

4. A flue gas treatment device with low-temperature SCR denitrification function according to claim 3, characterized in that: Multiple conical cylinders (16) are fixedly connected to the adsorption plate (15), and the tips of the conical cylinders (16) face the opposite direction to the flue gas.

5. A flue gas treatment device with low-temperature SCR denitrification function according to claim 1, characterized in that: The adsorption components are provided in multiple ways, and the multiple adsorption components are arranged alternately.

6. A flue gas treatment device with low-temperature SCR denitrification function according to claim 1, characterized in that: The ammonia spraying mechanism includes multiple sets of hollow rotating shafts (22) and connecting rotating shafts (25) movably connected to the inner wall of the mixing pipe (2). Each set of hollow rotating shafts (22) and connecting rotating shafts (25) is fixedly connected to two spray pipes (23). The two spray pipes (23) are symmetrically arranged about the center of the hollow rotating shafts (22) and connecting rotating shafts (25). One end of the two spray pipes (23) connected to the same set of hollow rotating shafts (22) and connecting shafts (25) extends into the interior of the hollow rotating shafts (22). A connecting pipe (21) is fixedly connected to the inner wall of the hollow rotating shafts (22). One end of the connecting pipe (21) located inside the hollow rotating shafts (22) is connected to one end of the two spray pipes (23), and the other end of the connecting pipe (21) extends to the outside of the mixing pipe (2).

7. A flue gas treatment device with low-temperature SCR denitrification function according to claim 6, characterized in that: Multiple connecting pipes (21) are movably connected to one end of the mixing pipe (2) at the outside. The liquid inlet pipe (19) is fixedly connected to the outer wall of the mixing pipe (2) by a mounting ring (20).

8. A flue gas treatment device with low-temperature SCR denitrification function according to claim 6, characterized in that: Each hollow rotating shaft (22) and the bottom of the connecting rotating shaft (25) are connected to a soaking box (29). Both ends of the soaking box (29) are fixedly connected to liquid tubes (30). Each liquid tube (30) is fixedly connected to a connecting pipe (31) at one end extending to the outside of the mixing tube (2). When the hollow rotating shaft (22) and the connecting rotating shaft (25) drive the two spray pipes (23) to rotate to the vertical direction of spraying, the spray pipe (23) at the bottom is in the soaking box (29).

9. A flue gas treatment device with low-temperature SCR denitrification function according to claim 8, characterized in that: The bottom of the soaking box (29) is fixedly connected to two sliding columns (32), and each sliding column (32) is movably connected to a mounting seat (33) on its outer circumference. The mounting seat (33) is fixedly connected to the inner wall of the mixing tube (2). A spring (34) is sleeved on the outer surface of the sliding column (32) at the top of the mounting seat (33). A limit plate (35) is fixedly connected to one end of the sliding column (32) at the bottom of the mounting seat (33).

10. A flue gas treatment device with low-temperature SCR denitrification function according to claim 8, characterized in that: Rotating blocks (28) are fixedly connected to the outer surfaces of the hollow rotating shaft (22) and the connecting rotating shaft (25). When the two spray pipes (23) are in a vertical state, the rotating blocks (28) abut against the upper surfaces of both ends of the soaking box (29). The hollow rotating shaft (22) and the connecting rotating shaft (25) drive the two spray pipes (23) to rotate. The rotating lever (28) exerts a downward pressure on the soaking box (29). The downward pressure distance and the width of the soaking box (29) are satisfied, so that the spray pipes (23) do not come into contact with the sides of the soaking box (29) when they rotate.

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