A denitration device for flue gas purification and a use method

Abstract

This invention relates to a denitrification device and its method of use for flue gas purification. The device includes a purification chamber and a conical shroud positioned inside the purification chamber with its tip pointing upwards. A downward-through connecting hole is coaxially formed at the top of the conical shroud. A filter element is fixed to the inner wall of the connecting hole. A first flow guide is disposed inside the conical shroud, a second flow guide is disposed below the conical shroud, a liquid supply assembly is disposed above the conical shroud, a liquid collection component is disposed inside the conical shroud, a gas distribution assembly is disposed below the second flow guide, and multiple bubble-breaking mechanisms are disposed at the bottom of the second flow guide. The liquid collection component is connected to the second flow guide via a linkage mechanism. When the absorbent is discharged, the liquid collection component drives the second flow guide and the bubble-breaking mechanisms to rise and fall via the linkage mechanism. This invention has the beneficial effect of improving the denitrification effect of the device on flue gas during use by achieving multi-stage gas-liquid contact.

Description

Technical Field

[0001] This invention relates to the field of flue gas purification technology, specifically to a denitrification device and its usage method for flue gas purification. Background Technology

[0002] Nitrogen oxides (NOx) are a major source of air pollution. Their emissions cause serious environmental problems such as acid rain and photochemical smog, and pose a threat to human health. Therefore, flue gas denitrification has become a necessary step in industrial exhaust gas treatment. Wet absorption is widely used in flue gas purification due to its mild operating conditions and relatively low equipment investment. Existing wet denitrification devices typically pass flue gas directly into the absorbent liquid, achieving gas-liquid contact through bubbling. However, this method has only one gas-liquid contact stage, and the mass transfer area between the flue gas and the absorbent liquid is limited. A large amount of nitrogen oxides escape with the bubbles before reacting, making it difficult for the overall denitrification efficiency to meet increasingly stringent emission requirements.

[0003] To address the issue of insufficient gas-liquid contact, some devices incorporate bubble-breaking structures such as filters along the bubble's ascent path, releasing internal gas upon bubble rupture to achieve secondary contact. However, this method only breaks up bubbles once during the ascent, resulting in a very short residence time of the released gas above the liquid surface before it exits the device, making it difficult to establish continuous and stable multi-stage contact with the absorbent. Furthermore, the bubble layer accumulating on the liquid surface hinders the renewal of the gas-liquid interface, further limiting the improvement of denitrification efficiency. In addition, although some solutions employ circulating spraying to assist denitrification, the contact between the spray liquid and the escaping gas remains a single, alternating process, failing to effectively improve the denitrification effect on the flue gas. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a denitrification device and its usage method for flue gas purification, which can improve the denitrification effect of the device on flue gas by realizing multi-stage gas-liquid contact.

[0005] This invention is achieved through the following technical solution: a denitrification device for flue gas purification, comprising a purification chamber and a conical hood disposed inside the purification chamber with its tip pointing upwards. The top of the conical hood has a downward-through connecting hole coaxially formed. A filter element is fixed on the inner wall of the connecting hole. A first flow guide is disposed inside the conical hood, and a second flow guide is disposed below the conical hood. The first flow guide, the second flow guide, the conical hood, and the purification chamber are coaxially arranged. Above the conical hood is a device for supplying absorbent liquid to the conical hood, causing part of the absorbent liquid to form a liquid film along the outer wall of the conical hood, and part of the absorbent liquid to pass through the connecting hole. A liquid supply assembly is introduced into the conical hood through a connection hole. The conical hood is equipped with a liquid collection component for receiving and temporarily storing the absorbent liquid entering the conical hood and dumping the stored absorbent liquid onto the first guide member when a predetermined value is reached. Below the second guide plate, a gas distribution component is provided for guiding the flue gas to be treated into the absorbent liquid in the purification chamber. At the bottom of the second guide plate, multiple bubble-breaking mechanisms are provided for breaking bubbles generated on the surface of the absorbent liquid. The liquid collection component is connected to the second guide plate through a linkage mechanism. When dumping the absorbent liquid, the liquid collection component drives the second guide plate and the bubble-breaking mechanisms to rise and fall through the linkage mechanism.

[0006] In use, this invention comprises a purification chamber and a conical hood with its tip pointing upwards, located inside the purification chamber. The top of the conical hood has a downward-through connecting hole coaxially formed, and a filter element is fixed to the inner wall of the connecting hole. A first guide element is located inside the conical hood, and a second guide element is located below the conical hood. The first guide element, the second guide element, the conical hood, and the purification chamber are coaxially arranged. A liquid supply assembly is located above the conical hood to provide absorbent liquid, causing some of the absorbent liquid to form a liquid film along the outer wall of the conical hood, and some absorbent liquid to enter the conical hood through the connecting hole. A liquid collection component is located inside the conical hood to receive and temporarily store the absorbent liquid entering the conical hood, and to unload the stored absorbent liquid onto the first guide element when a predetermined value is reached. A gas distribution assembly is located below the second guide plate to guide the flue gas to be treated into the absorbent liquid in the purification chamber. Multiple bubble-breaking mechanisms are located at the bottom of the second guide plate to break bubbles generated on the surface of the absorbent liquid. The liquid collection component is connected to the second guide plate via a linkage mechanism. When the absorbent is unloaded, the second guide plate and the defoaming mechanism are raised and lowered by a linkage mechanism. During use, the absorbent is first supplied to the top of the conical hood by the liquid supply component. A portion of the absorbent spreads naturally along the outer wall of the conical hood under gravity to form a continuous downward liquid film. Another portion enters the interior of the conical hood through the filter element in the connecting hole and is temporarily stored by the liquid collection component. When the absorbent in the liquid collection component reaches a predetermined weight, the liquid collection component triggers the unloading through the linkage mechanism, pouring the absorbent onto the first guide component in one go to form a secondary liquid film and flow downward. At the same time, the linkage mechanism drives the second guide plate and the defoaming mechanism to rise and fall, so that the defoaming mechanism can mechanically puncture and hydraulically impact the bubbles generated by the gas distribution component in the absorbent. The released flue gas continuously accumulates between the downward liquid film on the conical hood and the liquid film on the first guide component, so that the flue gas passes through the downward liquid film on the outside of the conical hood under pressure, thereby achieving multi-stage gas-liquid contact and improving the denitrification effect of the device during use.

[0007] Preferably, the first flow guide includes a first circular plate fixed to the inner wall of the conical shroud by a first vertical rod. The second flow guide is a second circular plate with a coaxial groove at the top. Two second vertical rods are fixed to the bottom of the first circular plate, located on the left and right sides of the first circular plate respectively. The second vertical rods pass downward through the groove into the second circular plate and are fixed to the bottom wall of the purification tank. The liquid collection component is a right-angled trapezoidal block with its top facing downward. A right-angled trapezoidal groove is formed at the top of the right-angled trapezoidal block. The linkage mechanism includes a slide rod, an annular plate, and a spring. The top of the slide rod passes through... The torsion spring shaft is rotatably connected to the bottom of the right-angled trapezoidal block. An annular plate is sealed and slidably mounted on the outer wall of the slide rod. The annular plate extends downward and is fixedly connected to the top of the first circular plate. A connecting rod is provided at the bottom of the slide rod, passing downward through the first circular plate and fixedly connected to the bottom wall of the circular groove. The spring is sleeved on the connecting rod and fixed to the bottom of the slide rod and the top of the first circular plate respectively. A magnetic block is provided on the side of the torsion spring shaft away from the tip of the right-angled trapezoidal block and fixed to the top of the slide rod. The top of the magnetic block is attached to the bottom of the right-angled trapezoidal block. The top of the first circular plate protrudes upward directly below the tip of the right-angled trapezoidal block.The first flow guide includes a first circular plate fixed to the inner wall of the conical hood by a first vertical rod. The second flow guide is a second circular plate with a coaxial groove at the top. Two second vertical rods are fixed to the bottom of the first circular plate, located on the left and right sides of the first circular plate respectively. The second vertical rods pass downward through the groove into the second circular plate and are fixed to the bottom wall of the purification chamber. The liquid collection component is a right-angled trapezoidal block with its top facing down. A right-angled trapezoidal groove is formed at the top of the right-angled trapezoidal block. The linkage mechanism includes a slide rod, an annular plate, and a spring. The top of the slide rod is connected to the shaft via a torsion spring. The bottom of the right-angled trapezoidal block is rotatably connected. An annular plate is sealed and slidable on the outer wall of the sliding rod. The annular plate extends downwards and is fixedly connected to the top of the first circular plate. A connecting rod is provided at the bottom of the sliding rod, passing downwards through the first circular plate and fixed to the bottom wall of the circular groove. A spring is sleeved on the connecting rod and fixed to the bottom of the sliding rod and the top of the first circular plate respectively. A magnetic block, fixed to the top of the sliding rod, is provided on the side of the torsion spring shaft away from the tip of the right-angled trapezoidal block. The top of the magnetic block is fitted against the bottom of the right-angled trapezoidal block. During use, the absorbent liquid in the right-angled trapezoidal groove on the right-angled trapezoidal block gradually increases... Multiple slide bars move within the annular plate under the gravity of the right-angled trapezoidal block, compressing the spring and causing the second circular plate to move up and down on the second vertical rod. This causes the bubble-breaking mechanism to move down with the second circular plate. Once the amount of absorbed liquid in the right-angled trapezoidal groove reaches a predetermined value, the right-angled trapezoidal block rapidly rotates around the torsion spring axis under the action of gravitational eccentricity and disengages from the magnetic block. This allows the absorbed liquid in the right-angled trapezoidal groove to be poured into the top of the first circular plate in one go. The liquid poured from the right-angled trapezoidal groove is then placed on the top of the first circular plate. At this time, because the first circular plate is located directly below the tip of the right-angled trapezoidal plate... The top of the circular plate bulges upward, and the top of the first circular plate is inclined radially downward. The liquid poured into the right-angled trapezoidal groove will be evenly distributed by the bulge and spread synchronously in all directions, forming a uniform and unbiased continuous downward liquid film that flows outward along the top of the first circular plate. After the liquid film on the top of the first circular plate reaches the outer edge of the first circular plate, it will fall into the circular groove on the top of the second circular plate through the gap between the conical cover and the first circular plate. After the pouring is completed, the spring drives the slide rod to reset, and the right-angled trapezoidal block returns to its initial position under the action of the torsion spring and the magnetic block, starting the next round of accumulation.

[0008] Preferably, the liquid supply assembly includes a circulating pump, a suction pipe, a connecting pipe, and a vertical pipe. The circulating pump is fixedly installed on the outer wall of the purification tank. The input end of the circulating pump is fixedly connected to the bottom of the purification tank through the suction pipe. The vertical pipe is located directly above the conical cover and its inner diameter is smaller than the inner diameter of the connecting hole. A connecting pipe that passes horizontally through the purification tank and is fixedly connected to the output end of the circulating pump is fixedly connected to the upper end of the vertical pipe. The liquid supply assembly includes a circulating pump, a suction pipe, a connecting pipe, and a vertical pipe. The circulating pump is fixedly installed on the outer wall of the purification tank. The input end of the circulating pump is fixedly connected to the bottom of the purification tank through the suction pipe. The vertical pipe is located directly above the conical hood, and the inner diameter of the vertical pipe is smaller than the inner diameter of the connecting hole. The upper end of the vertical pipe is fixedly connected to a connecting pipe that passes horizontally through the purification tank and is fixedly connected to the output end of the circulating pump. When the device is in use, the circulating pump draws absorbent liquid from the bottom of the purification tank through the suction pipe and sends it to the vertical pipe located directly above the conical hood through the connecting pipe. The absorbent liquid flows vertically downward from the vertical pipe. Since the inner diameter of the vertical pipe is smaller than the inner diameter of the connecting hole, the liquid flow naturally splits into two parts under the action of gravity: one part falls directly onto the outer surface of the top of the conical hood and flows downward in a continuous film along its outer wall, while the other part passes through the filter element in the connecting hole and enters the interior of the conical hood.

[0009] Preferably, the gas distribution assembly includes a third circular plate with a cavity inside. Multiple connecting holes communicating with the cavity are located at the top of the third circular plate, and one-way valves are fixed within these connecting holes. A flue gas pipe extending downwards through the purification chamber is fixed at the bottom of the third circular plate. In operation, the flue gas to be treated enters the cavity inside the third circular plate through the flue gas pipe. Under pressure, the flue gas is evenly ejected upwards through the one-way valves in the multiple connecting holes at the top of the third circular plate and enters the absorbent liquid inside the purification chamber, making initial contact with the absorbent liquid and completing the first stage of the denitrification reaction.

[0010] Preferably, the bubble-breaking mechanism includes multiple needles fixed to the bottom of the second circular plate. Each needle has a coaxially formed drip hole at its bottom, which extends upwards through the needle and the second circular plate. In use, liquid falling into the circular groove on the second circular plate flows downwards into the drip hole under gravity and drips out, creating a hydraulic impact on the surface of the absorbent liquid. Simultaneously, as the needles descend with the second circular plate, they mechanically puncture the air bubbles on the liquid surface, thereby rapidly breaking them.

[0011] Preferably, an inlet pipe and a drain pipe are fixedly connected to the outer wall of the purification chamber, and control valves are installed on both the inlet pipe and the drain pipe. By fixing the inlet pipe and the drain pipe to the outer wall of the purification chamber, and installing control valves on both pipes, the device allows for the injection of nitrogen oxide absorbent into the purification chamber by opening the inlet pipe through the control valve on the inlet pipe during use. When the absorbent needs to be replaced, the circulation pump and flue gas input are first shut off, then the control valve on the drain pipe is opened to discharge the saturated absorbent, followed by closing the drain pipe and re-injecting fresh absorbent.

[0012] Preferably, a transparent observation window is also fixedly installed on the side wall of the purification chamber. By fixing a transparent observation window on the side wall of the purification chamber, the operator can observe the liquid level, liquid film flow, and operation of various moving parts inside the purification chamber in real time during use.

[0013] Preferably, the top of the purification box is connected to a treatment tank via a conduit. The treatment tank contains a multi-layer activated carbon purification mesh. A sealing cap is threaded onto the top of the treatment tank. Two limiting rods that pass downward through the multi-layer activated carbon purification mesh are fixed to the bottom of the sealing cap. The limiting rods are equipped with limiting blocks and nuts that abut against the top and bottom of the multi-layer activated carbon purification mesh, respectively. A discharge pipe is connected to the outer wall of the treatment tank. The top of the purification chamber is connected to a treatment tank via a conduit. The treatment tank contains multiple layers of activated carbon purification mesh. A sealing cap is threaded onto the top of the treatment tank, and two limiting rods are fixed to the bottom of the sealing cap, passing downwards through the multiple layers of activated carbon purification mesh. Each limiting rod has a limiting block and a nut that respectively abut against the top and bottom of the multiple layers of activated carbon purification mesh. An exhaust pipe is connected to the outer wall of the treatment tank. During operation, the flue gas, after passing through the downward liquid film outside the conical hood, enters the bottom of the treatment tank through the conduit and passes upwards through the multiple layers of activated carbon purification mesh. The activated carbon adsorbs residual trace amounts of harmful gases and odor components before being discharged through the exhaust pipe. When cleaning or replacing the activated carbon mesh is required, first unscrew the sealing cap and lift the limiting rods upwards. Loosen the bottom nut, and the multiple layers of activated carbon purification mesh can be removed for appropriate treatment.

[0014] A method of using a denitrification device for flue gas purification includes the following steps: a. First, open the inlet pipe through the control valve on the inlet pipe to inject nitrogen oxide absorption liquid into the purification tank through the inlet pipe. After observing through the transparent observation window that the liquid level is higher than the third circular plate and lower than the bottom of the needle, close the inlet pipe through the control valve on the inlet pipe. b. Start the circulation pump to draw nitrogen oxide absorbent from the bottom of the purification tank through the suction pipe. The nitrogen oxide absorbent flows vertically downward through the connecting pipe from the vertical pipe. Since the inner diameter of the vertical pipe is smaller than the inner diameter of the connecting hole, the nitrogen oxide absorbent will be divided into two parts under the action of gravity. One part of the nitrogen oxide absorbent falls directly onto the outer surface of the top of the conical hood and flows down evenly in a continuous film along the outer wall of the conical hood, forming a downward liquid film covering the entire outer wall of the conical hood. After the downward liquid film on the conical hood reaches the bottom edge of the conical hood, it will fall directly onto the surface of the nitrogen oxide absorbent in the purification tank under the action of gravity. The other part of the nitrogen oxide absorbent passes through the connecting hole at the top of the conical hood, flows down through the filter element fixed in the connecting hole, and falls into the right-angled trapezoidal groove at the top of the right-angled trapezoidal block for accumulation. c. As the liquid level in the right-angled trapezoidal tank gradually rises, the total weight of the liquid continuously increases. The sliding rod overcomes the spring force and moves downward on the inner wall of the annular plate. It then drives the right-angled trapezoidal block downward via the torsion spring shaft and the magnetic block. At this time, because the bottom wall of the circular groove on the second circular plate is fixedly connected to the bottom of the sliding rod via a connecting rod, the sliding rod drives the second circular plate downward on the vertical rod, causing the needle fixed to the bottom of the second circular plate to move downward synchronously, gradually inserting the needle into the absorbent liquid in the purification tank. When the weight of the liquid in the right-angled trapezoidal tank reaches a certain amount, the right-angled trapezoidal block will detach from the magnetic block under the action of gravitational eccentricity and rapidly rotate around the torsion spring shaft, thereby discharging the liquid in the right-angled trapezoidal tank. The liquid is poured quickly and in one go onto the top of the first circular plate below. At this time, because the top of the first circular plate, which is located directly below the tip of the right-angled trapezoidal plate, is raised upward, the top of the first circular plate is tilted downward in the radial direction. The liquid poured into the right-angled trapezoidal groove will be evenly distributed by the protrusion and spread synchronously in all directions, forming a layer of uniform thickness and continuous downward liquid film without deviation. The liquid film on the top of the first circular plate flows to the outer edge of the first circular plate and then falls into the circular groove on the top of the second circular plate through the gap between the conical cover and the first circular plate. After entering the circular groove, the liquid will flow downward into the drip hole under the action of gravity, so that the liquid returns to the absorbent in the purification box through the third circular plate and the needle. d. After the liquid in the right-angled trapezoidal groove is poured out, the weight of the right-angled trapezoidal block decreases sharply. The slide bar will return to the initial position on the inner wall of the annular plate under the drive of the spring. This will drive the right-angled trapezoidal block, the second circular plate and the needle to rise synchronously, so that the needle moves to the top of the absorbent liquid in the purification box and returns to the initial position. At the same time, under the torque of the torsion spring shaft, the right-angled trapezoidal block flips back to its original position. The magnetic attraction of the magnetic block will re-attract and reposition the bottom of the right-angled trapezoidal block, so that the right-angled trapezoidal groove on the right-angled trapezoidal block returns to the initial position and begins the next round of accumulation. This cycle repeats so that the downward liquid film at the top of the first circular plate is continuously formed. e. The flue gas to be treated is sent into the cavity of the third circular plate through the flue gas pipe. Under pressure, the flue gas rushes upward through the one-way valve in the connecting hole and enters the absorbent liquid at the bottom of the purification tank, making initial contact with the absorbent liquid and completing the first stage of denitrification reaction. Some flue gas may form bubbles on the surface of the absorbent liquid. The bubbles formed on the surface of the absorbent liquid will be quickly destroyed by the mechanical puncture of the needle and the hydraulic impact of the liquid flowing out of the drip hole. The flue gas wrapped in the bubbles is released into the space above the liquid surface. Under pressure, the released flue gas is squeezed through the downward liquid film that falls directly into the absorbent liquid in the purification tank, so as to achieve full contact between the flue gas and the absorbent liquid in the liquid film and achieve secondary fine denitrification. The flue gas squeezed by the liquid film continues to rise through the gap between the liquid film and the inner side wall of the purification tank and enters the treatment tank through the conduit. In the treatment tank, the flue gas passes through multiple layers of activated carbon purification mesh from bottom to top. The activated carbon adsorbs the residual trace harmful gases and odor components and finally discharges from the emission pipe. f. If the absorbent in the purification chamber needs to be replaced, first, prevent the flue gas from entering the cavity of the third circular plate through the flue gas pipe and turn off the circulation pump. Then, open the drain pipe through the control valve on the drain pipe to discharge the saturated absorbent in the purification chamber. Then, close the drain pipe through the control valve on the drain pipe and open the inlet pipe through the control valve on the inlet pipe to inject new nitrogen oxide absorbent into the purification chamber. Observe through the transparent observation window that the liquid level is higher than the third circular plate and lower than the bottom of the needle. Then, close the inlet pipe through the control valve on the inlet pipe. If the multi-layer activated carbon purification screen needs to be cleaned or replaced, first, unscrew the sealing cap and control the movement of the sealing cap to lift the limit rod upward, loosen the bottom nut, and pull out the multi-layer activated carbon purification screen for cleaning or replacement.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: A purification chamber and a conical hood with its tip pointing upwards are arranged inside the purification chamber. A downward-through connecting hole is coaxially opened at the top of the conical hood, and a filter element is fixed on the inner wall of the connecting hole. A first guide element is arranged inside the conical hood, and a second guide element is arranged below the conical hood. The first guide element, the second guide element, the conical hood, and the purification chamber are coaxially arranged. A liquid supply assembly is arranged above the conical hood to provide absorbent liquid, causing part of the absorbent liquid to form a liquid film along the outer wall of the conical hood, and part of the absorbent liquid to enter the conical hood through the connecting hole. A liquid collection component is arranged inside the conical hood to receive and temporarily store the absorbent liquid entering the conical hood, and to unload the stored absorbent liquid onto the first guide element when a predetermined value is reached. A gas distribution assembly is arranged below the second guide plate to guide the flue gas to be treated into the absorbent liquid in the purification chamber. Multiple bubble-breaking mechanisms are arranged at the bottom of the second guide plate to break bubbles generated on the surface of the absorbent liquid. The liquid collection component is connected to the second guide plate via a linkage mechanism. Next, when the liquid collection unit unloads the absorbent, it drives the second guide plate and the bubble-breaking mechanism to rise and fall through the linkage mechanism. When the device is in use, the liquid supply component first delivers absorbent to the top of the conical hood. Part of the absorbent spreads naturally along the outer wall of the conical hood under the action of gravity to form a continuous downward liquid film. The other part enters the interior of the conical hood through the filter element in the connecting hole and is temporarily stored by the liquid collection unit. When the absorbent in the liquid collection unit reaches the predetermined weight, the liquid collection unit triggers the unloading through the linkage mechanism, pouring the absorbent onto the first guide plate in one go to form a secondary liquid film and flow downward. At the same time, the linkage mechanism drives the second guide plate and the bubble-breaking mechanism to rise and fall, so that the bubble-breaking mechanism can mechanically puncture and hydraulically impact the bubbles generated by the gas distribution component in the absorbent. The released flue gas continuously accumulates between the downward liquid film on the conical hood and the liquid film on the first guide plate, so that the flue gas passes through the downward liquid film on the outside of the conical hood under pressure, thereby achieving multi-stage gas-liquid contact and improving the denitrification effect of the device during use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Structural perspective view; Figure 3 for Figure 2 Schematic diagram of part A in the middle; Figure 4 for Figure 2 Schematic diagram of Part B in the middle section; Figure 5 for Figure 2 Schematic diagram of the structure of part C; Figure 6 for Figure 2 Schematic diagram of the structure of part D in the middle; As shown in the figure: 1. Connecting pipe; 2. Circulating pump; 3. Liquid extraction pipe; 4. Control valve; 5. Liquid inlet pipe; 6. Flue gas pipe; 7. Conduit; 8. Sealing cap; 9. Treatment tank; 10. Discharge pipe; 11. Sewage pipe; 12. Vertical pipe; 13. Purification box; 14. Filter element; 15. Third circular plate; 16. One-way valve; 17. Connecting hole; 18. First vertical rod; 20. Connecting hole; 21. Second vertical rod; 22. Limiting valve. 23. Multi-layer activated carbon purification mesh, 24. Limiting rod, 25. Nut, 26. Conical cover, 27. Right-angled trapezoidal groove, 28. Right-angled trapezoidal block, 29. Magnetic block, 30. Annular plate, 31. Connecting rod, 32. Torsion spring shaft, 33. Sliding rod, 34. Spring, 35. First circular plate, 36. Circular groove, 37. Second circular plate, 38. Needle body, 39. Drip hole, 40. Transparent observation window. Detailed Implementation

[0017] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0018] like Figures 1-6 The denitrification device for flue gas purification of the present invention includes a purification chamber 13 and a conical shroud 26 disposed inside the purification chamber 13 with its tip pointing upwards. A downward-through connecting hole 17 is coaxially formed at the top of the conical shroud 26. A filter element 14 is fixed on the inner wall of the connecting hole 17. A first flow guide is disposed inside the conical shroud 26, and a second flow guide is disposed below the conical shroud 26. The first flow guide, the second flow guide, the conical shroud 26, and the purification chamber 13 are coaxially arranged. An absorbent material is disposed above the conical shroud 26 to provide absorbent liquid to the conical shroud 26, causing part of the absorbent liquid to form a liquid film along the outer wall of the conical shroud 26, and part of the absorbent liquid... A liquid supply assembly enters the conical shroud 26 through the connection hole 17. The conical shroud 26 is equipped with a liquid collection component for receiving and temporarily storing the absorbent liquid entering the conical shroud 26 and dumping the stored absorbent liquid onto the first guide member when a predetermined value is reached. Below the second guide plate is a gas distribution component for guiding the flue gas to be treated into the absorbent liquid in the purification box 13. At the bottom of the second guide plate are multiple bubble-breaking mechanisms for breaking bubbles generated on the surface of the absorbent liquid. The liquid collection component is connected to the second guide plate through a linkage mechanism. When dumping the absorbent liquid, the liquid collection component drives the second guide plate and the bubble-breaking mechanisms to rise and fall through the linkage mechanism.

[0019] The first guide component includes a first circular plate 35 fixed to the inner wall of the conical cover 26 by a first vertical rod 18. The second guide component is a second circular plate 37. A circular groove 36 is coaxially formed on the top of the second circular plate 37. Two second vertical rods 21 are fixed to the bottom of the first circular plate 35. The two second vertical rods 21 are located on the left and right sides of the first circular plate 35, respectively. The second vertical rods 21 pass downward through the circular groove 36 through the second circular plate 37 and are fixed to the inner bottom wall of the purification box 13. The liquid collection component is a right-angled trapezoidal block 28 with its top bottom facing down. A right-angled trapezoidal groove 27 is formed on the top of the right-angled trapezoidal block 28. The linkage mechanism includes a slide rod 33, an annular plate 30, and a spring 34. The top of the slide rod 33 passes through... The torsion spring shaft 32 is rotatably connected to the bottom of the right-angled trapezoidal block 28. An annular plate 30 is sealed and slidably mounted on the outer wall of the slide rod 33. The annular plate 30 extends downwards and is fixedly connected to the top of the first circular plate 35. A connecting rod 31 is provided at the bottom of the slide rod 33, passing downwards through the first circular plate 35 and fixedly connected to the bottom wall of the circular groove 36. A spring 34 is sleeved on the connecting rod 31 and fixed to the bottom of the slide rod 33 and the top of the first circular plate 35, respectively. A magnetic block 29, fixed to the top of the slide rod 33, is provided on the side of the torsion spring shaft 32 away from the tip of the right-angled trapezoidal block 28. The top of the magnetic block 29 is fitted against the bottom of the right-angled trapezoidal block 28. When the device is in use, the right-angled trapezoidal block 28 is straight... As the amount of absorbent liquid in the trapezoidal groove 27 gradually increases, the slide bar 33 moves within the annular plate 30 under the gravity of the right-angled trapezoidal block 28, compressing the spring 34 and causing the second circular plate 37 to move up and down on the second vertical rod 21. This causes the bubble-breaking mechanism to move down with the second circular plate 37. Once the amount of absorbent liquid in the right-angled trapezoidal groove 27 reaches a predetermined value, the right-angled trapezoidal block 28 will rapidly rotate around the torsion spring shaft 32 under the action of gravitational eccentricity and detach from the magnetic block 29. This allows the absorbent liquid in the right-angled trapezoidal groove 27 to be poured onto the top of the first circular plate 35 in one go. The liquid poured from the right-angled trapezoidal groove 27 is then placed on top of the first circular plate 35. At this time, because it is located on the right-angled trapezoidal plate 28... The top of the first circular plate 35 directly below the tip protrudes upwards, and the top of the first circular plate 35 is inclined radially downwards. The liquid poured into the right-angled trapezoidal groove 27 will be evenly distributed by the protrusion and spread synchronously in all directions, forming a uniform thickness and continuous downward liquid film without deviation. The liquid film at the top of the first circular plate 35 flows outwards. After the liquid film at the top of the first circular plate 35 reaches the outer edge of the first circular plate 35, it will fall into the circular groove 36 at the top of the second circular plate 37 through the gap between the conical cover 26 and the first circular plate 35. After the pouring is completed, the spring 34 drives the slide rod 33 to reset, and the right-angled trapezoidal block 28 returns to the initial position under the action of the torsion spring and the magnetic block 29, and the next round of accumulation begins.The liquid supply assembly includes a circulation pump 2, a suction pipe 3, a connecting pipe 1, and a vertical pipe 12. The circulation pump 2 is fixedly installed on the outer wall of the purification tank 13. The input end of the circulation pump 2 is fixedly connected to the bottom of the purification tank 13 through the suction pipe 3. The vertical pipe 12 is located directly above the conical cover 26, and the inner diameter of the vertical pipe 12 is smaller than the inner diameter of the connecting hole 17. The upper end of the vertical pipe 12 is fixedly connected to the connecting pipe 1, which passes horizontally through the purification tank 13 and is fixedly connected to the output end of the circulation pump 2. When the device is in use, the circulation pump 2 draws the absorbent liquid from the bottom of the purification tank 13 through the suction pipe 3 and sends it into the vertical pipe 12 located directly above the conical cover 26 through the connecting pipe 1. The absorbent liquid flows vertically downward from the vertical pipe 12. Since the inner diameter of the vertical pipe 12 is smaller than the inner diameter of the connecting hole 17, the liquid flow naturally splits into two parts under the action of gravity: one part falls directly onto the outer surface of the top of the conical cover 26 and flows downward in a continuous film along its outer wall. The other part passes through the filter element 14 in the connecting hole 17 and enters the interior of the conical cover 26. The gas distribution assembly includes a third circular plate 15, which has a cavity. The top of the third circular plate 15 has multiple connecting holes 20 that communicate with the cavity. A one-way valve 16 is fixed in the connecting holes 20. A flue gas pipe 6 is fixed at the bottom of the third circular plate 15 and extends downward through the purification chamber 13. When the device is in use, the flue gas to be treated enters the cavity inside the third circular plate 15 through the flue gas pipe 6. Under pressure, the flue gas is evenly pushed upward through the one-way valves 16 in the multiple connecting holes 20 at the top of the third circular plate 15 and enters the absorbent liquid in the purification chamber 13, where it makes initial contact with the absorbent liquid and completes the first stage of denitrification reaction. The bubble-breaking mechanism includes multiple needles 38 fixed to the bottom of the second circular plate 37. Each needle 38 has a coaxially spaced drip hole 39 at its bottom, which extends upwards through the needle 38 and the second circular plate 37. During use, liquid falling into the circular groove 36 on the second circular plate 37 flows downwards into the drip hole 39 under gravity and drips out, creating a hydraulic impact on the absorbent surface. Simultaneously, as the needles 38 descend with the second circular plate 37, they mechanically puncture the air bubbles on the liquid surface, thus rapidly breaking them. An inlet pipe 5 and a drain pipe 11 are fixedly connected to the outer wall of the purification tank 13. Both the inlet pipe 5 and the drain pipe 11 are equipped with control valves 4. During use, the inlet pipe 5 is opened via the control valve 4 to inject nitrogen oxide absorbent into the purification tank 13. When the absorbent needs to be replaced, the circulation pump 2 and flue gas input are first shut off, then the control valve 4 on the drain pipe 11 is opened to discharge the saturated absorbent. The drain pipe 11 is then closed, and fresh absorbent is injected again. By fixing a transparent observation window 40 on the side wall of the purification tank 13, the operator can observe the liquid level, liquid film flow status and operation of each moving part inside the purification tank 13 in real time through the transparent observation window 40 when the device is in use.The top of the purification chamber 13 is connected to the treatment tank 9 via the conduit 7. The treatment tank 9 is equipped with a multi-layer activated carbon purification mesh 23. The top of the treatment tank 9 is threadedly connected to a sealing cap 8. The bottom of the sealing cap 8 is fixed with two limiting rods 24 that pass downward through the multi-layer activated carbon purification mesh 23. The limiting rods 24 are equipped with limiting blocks 22 and nuts 25 that abut against the top and bottom of the multi-layer activated carbon purification mesh 23, respectively. The outer wall of the treatment tank 9 is connected to an exhaust pipe 10. When the device is in use, the flue gas that has passed through the downward liquid film outside the conical hood 26 enters the bottom of the treatment tank 9 through the conduit 7 and passes through the multi-layer activated carbon purification mesh 23 from bottom to top. After the activated carbon adsorbs the residual trace amounts of harmful gases and odor components, it is discharged from the exhaust pipe 10. When it is necessary to clean or replace the activated carbon mesh, first unscrew the sealing cap 8 and lift the limiting rods 24 upward. After loosening the bottom nut 25, the multi-layer activated carbon purification mesh 23 can be pulled out for appropriate treatment.

[0020] A method of using a denitrification device for flue gas purification includes the following steps: a. First, open the inlet pipe 5 through the control valve 4 on the inlet pipe 5, thereby injecting nitrogen oxide absorption liquid into the purification box 13 through the inlet pipe 5. After observing the liquid level through the transparent observation window 40 until it is higher than the third circular plate 15 and lower than the bottom of the needle body 38, close the inlet pipe 5 through the control valve 4 on the inlet pipe 5. b. Start the circulation pump 2, so that the circulation pump 2 draws nitrogen oxide absorption liquid from the bottom of the purification tank 13 through the liquid extraction pipe 3, and the nitrogen oxide absorption liquid flows vertically downward from the vertical pipe 12 through the connecting pipe 1. At this time, because the inner diameter of the vertical pipe 12 is smaller than the inner diameter of the connecting hole 17, the flowing nitrogen oxide absorption liquid will be divided into two parts under the action of gravity. One part of the nitrogen oxide absorption liquid falls directly on the outer surface of the top of the conical cover 26, and flows down evenly in a continuous film along the outer wall of the conical cover 26, forming a downward liquid film covering the entire outer wall of the conical cover 26. After the downward liquid film on the conical cover 26 flows to the bottom edge of the conical cover 26, it will fall directly onto the liquid surface of the nitrogen oxide absorption liquid in the purification tank 13 under the action of gravity. The other part of the nitrogen oxide absorption liquid passes through the connecting hole 17 at the top of the conical cover 26, flows down through the filter element 14 fixed in the connecting hole 17, and falls into the right-angled trapezoidal groove 27 at the top of the right-angled trapezoidal block 28 for accumulation. c. As the liquid level in the right-angled trapezoidal groove 27 gradually rises, the total weight of the liquid continuously increases. The slide bar 33 will overcome the elastic force of the spring 34 and move downward on the inner wall of the annular plate 30. It will also drive the right-angled trapezoidal block 28 to descend through the torsion spring shaft 32 and the magnetic block 29. At this time, because the bottom wall of the inner wall of the circular groove 36 on the second circular plate 37 is fixedly connected to the bottom of the slide bar 33 through the connecting rod 31, the slide bar 33 will drive the second circular plate 37 to move downward on the vertical rod 21, and cause the needle body 38 fixed at the bottom of the second circular plate 37 to move downward synchronously, so that the needle body 38 is gradually inserted into the absorbent liquid in the purification box 13. When the weight of the liquid in the right-angled trapezoidal groove 27 reaches a certain amount, the right-angled trapezoidal block 28 will detach from the magnetic block 29 under the action of the gravitational eccentricity and rapidly rotate around the torsion spring shaft 32, thereby lowering the right-angled trapezoidal block 28. The liquid in the trapezoidal groove 27 is poured quickly into the top of the first circular plate 35 below. At this time, because the top of the first circular plate 35, which is located directly below the tip of the right-angled trapezoidal plate 28, is raised upward, the top of the first circular plate 35 is tilted downward in the radial direction. The liquid poured into the right-angled trapezoidal groove 27 will be evenly distributed by the protrusion and spread synchronously in all directions, forming a layer of uniform thickness and continuous downward liquid film without deviation. The liquid film at the top of the first circular plate 35 flows to the outer edge of the first circular plate 35 and then falls into the circular groove 36 at the top of the second circular plate 37 through the gap between the conical cover 26 and the first circular plate 35. After entering the circular groove 36, the liquid will flow downward into the drip hole 39 under the action of gravity, so that the liquid returns to the absorbent in the purification box 13 through the third circular plate 15 and the needle 38. d. After the liquid in the right-angled trapezoidal groove 27 is poured out, the weight of the right-angled trapezoidal block 28 decreases sharply. The slide bar 33 will return to the initial position on the inner wall of the annular plate 30 under the drive of the spring 34. This will drive the right-angled trapezoidal block 28, the second circular plate 37 and the needle body 38 to rise synchronously, so that the needle body 38 moves to the top of the absorbent liquid in the purification box 13 and returns to the initial position. At the same time, under the torque of the torsion spring shaft 32, the right-angled trapezoidal block 28 flips back to its original position. The magnetic attraction of the magnetic block 29 will re-attract and reposition the bottom of the right-angled trapezoidal block 28, so that the right-angled trapezoidal groove 27 on the right-angled trapezoidal block 28 returns to the initial position and begins the next round of accumulation. This cycle repeats so that the downward liquid film at the top of the first circular plate 35 is continuously formed. e. The flue gas to be treated is sent into the cavity of the third circular plate 15 through the flue gas pipe 6. Under pressure, the flue gas rushes upward through the one-way valve 16 in the connecting hole 20 and enters the absorbent liquid at the bottom of the purification box 13, making initial contact with the absorbent liquid and completing the first stage of denitrification reaction. Some flue gas may form bubbles on the surface of the absorbent liquid. The bubbles formed on the surface of the absorbent liquid will be quickly destroyed by the combined action of mechanical puncture by the needle 38 and hydraulic impact of the liquid flowing out of the drip hole 39, and the flue gas wrapped in the bubbles will be released. The flue gas, after being released, is squeezed through the downward liquid film in the absorbent liquid that falls directly into the purification tank 13 under pressure, thus achieving full contact between the flue gas and the absorbent liquid in the liquid film and realizing secondary fine denitrification. After being squeezed by the liquid film, the flue gas continues to rise through the gap between the liquid film and the inner wall of the purification tank 13 and enters the treatment tank 9 through the duct 7. In the treatment tank 9, the flue gas passes through the multi-layer activated carbon purification mesh 23 from bottom to top. The activated carbon adsorbs the residual trace amounts of harmful gases and odor components and finally discharges from the discharge pipe 10. f. If the absorbent in the purification chamber 13 needs to be replaced, the flue gas must first be prevented from entering the cavity of the third circular plate 15 through the flue gas pipe 6, and the circulation pump 2 must be turned off. Then, the drain pipe 11 is opened through the control valve 4 on the drain pipe 11 to discharge the saturated absorbent in the purification chamber 13. Then, the drain pipe 11 is closed through the control valve 4 on the drain pipe 11, and the inlet pipe 5 is opened through the control valve 4 on the inlet pipe 5 to inject new nitrogen oxide absorbent into the purification chamber 13. After observing through the transparent observation window 40 that the liquid level is higher than the third circular plate 15 and lower than the bottom of the needle body 38, the inlet pipe 5 is closed through the control valve 4 on the inlet pipe 5. If the multi-layer activated carbon purification mesh 23 needs to be cleaned or replaced, the sealing cover 8 must be unscrewed first, and the sealing cover 8 is moved to lift the limit rod 24 upward. The bottom nut 25 is loosened, and the multi-layer activated carbon purification mesh 23 is pulled out for cleaning or replacement.

[0021] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A denitrification device for flue gas purification, characterized in that: The system includes a purification chamber (13) and a conical shroud (26) with its tip pointing upwards, located inside the purification chamber. A downward-through connecting hole (17) is coaxially formed at the top of the conical shroud. A filter element (14) is fixed to the inner wall of the connecting hole. A first flow guide is located inside the conical shroud, and a second flow guide is located below the conical shroud. The first flow guide, the second flow guide, the conical shroud, and the purification chamber are coaxially arranged. An absorbent material is located above the conical shroud to provide absorbent liquid, causing some of the absorbent liquid to form a liquid film along the outer wall of the conical shroud, and some of the absorbent liquid to enter the conical shroud through the connecting hole. The liquid supply assembly includes a liquid collector inside the conical hood for receiving and temporarily storing the absorbent liquid entering the conical hood and dumping the stored absorbent liquid onto the first guide plate when a predetermined value is reached. Below the second guide plate is a gas distribution assembly for guiding the flue gas to be treated into the absorbent liquid in the purification chamber. At the bottom of the second guide plate are multiple bubble-breaking mechanisms for breaking bubbles generated on the surface of the absorbent liquid. The liquid collector is connected to the second guide plate through a linkage mechanism. When dumping the absorbent liquid, the liquid collector drives the second guide plate and the bubble-breaking mechanisms to rise and fall through the linkage mechanism.

2. The denitrification device for flue gas purification according to claim 1, characterized in that: The first flow guide includes a first circular plate (35) fixed to the inner wall of the conical hood by a first vertical rod (18). The second flow guide is a second circular plate (37). A circular groove (36) is coaxially opened on the top of the second circular plate. Two second vertical rods (21) are fixed to the bottom of the first circular plate. The two second vertical rods are located on the left and right sides of the first circular plate, respectively. The second vertical rods pass downward through the circular groove through the second circular plate and are fixed to the bottom wall of the purification box. The liquid collection component is a right-angled trapezoidal block (28) with the top bottom facing down. A right-angled trapezoidal groove (27) is opened on the top of the right-angled trapezoidal block. The linkage mechanism includes a slide rod (33), an annular plate (30), and a spring. (34) The top of the slide rod is rotatably connected to the bottom of the right trapezoidal block via a torsion spring shaft (32). An annular plate is sealed and slidable on the outer wall of the slide rod. The annular plate extends downward and is fixedly connected to the top of the first circular plate. A connecting rod (31) is provided at the bottom of the slide rod, passing downward through the first circular plate and fixedly connected to the bottom wall of the circular groove. The spring is sleeved on the connecting rod and fixed to the bottom of the slide rod and the top of the first circular plate respectively. A magnetic block (29) fixed to the top of the slide rod is provided on the side of the torsion spring shaft away from the tip of the right trapezoidal block. The top of the magnetic block is attached to the bottom of the right trapezoidal block. The top of the first circular plate protrudes in the direction directly below the tip of the right trapezoidal block.

3. The denitrification device for flue gas purification according to claim 2, characterized in that: The liquid supply assembly includes a circulation pump (2), a liquid extraction pipe (3), a connecting pipe (1), and a vertical pipe (12). The circulation pump is fixedly installed on the outer wall of the purification box. The input end of the circulation pump is fixedly connected to the bottom of the purification box through the liquid extraction pipe. The vertical pipe is located directly above the conical cover and its inner diameter is smaller than the inner diameter of the connecting hole. The upper end of the vertical pipe is fixedly connected to a connecting pipe that passes horizontally through the purification box and is fixedly connected to the output end of the circulation pump.

4. The denitrification device for flue gas purification according to claim 1, characterized in that: The gas distribution assembly includes a third circular plate (15), which has a cavity. The top of the third circular plate has multiple connecting holes (20) that communicate with the cavity. A one-way valve (16) is fixed in the connecting hole. A flue gas pipe (6) that extends downward through the purification box is fixed at the bottom of the third circular plate.

5. The denitrification device for flue gas purification according to claim 4, characterized in that: The bubble-breaking mechanism includes multiple needles (38) fixed to the bottom of the second circular plate. The bottom of each needle is coaxially provided with a drip hole (39), which extends upward through the needle and the second circular plate.

6. The denitrification device for flue gas purification according to claim 4, characterized in that: An inlet pipe (5) and a drain pipe (11) are fixedly connected to the outer wall of the purification box, and a control valve (4) is installed on both the inlet pipe and the drain pipe.

7. The denitrification device for flue gas purification according to claim 4, characterized in that: A transparent observation window (40) is also fixedly installed on the side wall of the purification box.

8. The denitrification device for flue gas purification according to claim 4, characterized in that: The top of the purification box is connected to a treatment tank (9) via a conduit (7). The treatment tank is equipped with a multi-layer activated carbon purification mesh (23). The top of the treatment tank is threaded with a sealing cap (8). The bottom of the sealing cap is fixed with two limiting rods (24) that pass downward through the multi-layer activated carbon purification mesh. The limiting rods are equipped with limiting blocks (22) and nuts (25) that abut against the top and bottom of the multi-layer activated carbon purification mesh, respectively. The outer wall of the treatment tank is connected to a discharge pipe (10).

9. The method of using the denitrification device for flue gas purification according to any one of claims 1-8, characterized in that, Includes the following steps: a. Open the inlet pipe through the control valve on the inlet pipe to inject nitrogen oxide absorption liquid into the purification tank through the inlet pipe. After observing through the transparent observation window that the liquid level is higher than the third circular plate and lower than the bottom of the needle body, close the inlet pipe through the control valve on the inlet pipe. b. Start the circulation pump to draw nitrogen oxide absorbent from the bottom of the purification tank through the suction pipe. The nitrogen oxide absorbent flows vertically downward through the connecting pipe from the vertical pipe. Since the inner diameter of the vertical pipe is smaller than the inner diameter of the connecting hole, the nitrogen oxide absorbent will be divided into two parts under the action of gravity. One part of the nitrogen oxide absorbent falls directly onto the outer surface of the top of the conical hood and flows down evenly in a continuous film along the outer wall of the conical hood, forming a downward liquid film covering the entire outer wall of the conical hood. After the downward liquid film on the conical hood reaches the bottom edge of the conical hood, it will fall directly onto the surface of the nitrogen oxide absorbent in the purification tank under the action of gravity. The other part of the nitrogen oxide absorbent passes through the connecting hole at the top of the conical hood, flows down through the filter element fixed in the connecting hole, and falls into the right-angled trapezoidal groove at the top of the right-angled trapezoidal block for accumulation. c. As the liquid level in the right-angled trapezoidal tank gradually rises, the total weight of the liquid continuously increases. The sliding rod overcomes the spring force and moves downward on the inner wall of the annular plate. It then drives the right-angled trapezoidal block downward via the torsion spring shaft and the magnetic block. At this time, because the bottom wall of the circular groove on the second circular plate is fixedly connected to the bottom of the sliding rod via a connecting rod, the sliding rod drives the second circular plate downward on the vertical rod, causing the needle fixed to the bottom of the second circular plate to move downward synchronously, gradually inserting the needle into the absorbent liquid in the purification tank. When the weight of the liquid in the right-angled trapezoidal tank reaches a certain amount, the right-angled trapezoidal block will detach from the magnetic block under the action of gravitational eccentricity and rapidly rotate around the torsion spring shaft, thereby discharging the liquid in the right-angled trapezoidal tank. The liquid is poured quickly and in one go onto the top of the first circular plate below. At this time, because the top of the first circular plate, which is located directly below the tip of the right-angled trapezoidal plate, is raised upward, the top of the first circular plate is tilted downward in the radial direction. The liquid poured into the right-angled trapezoidal groove will be evenly distributed by the protrusion and spread synchronously in all directions, forming a layer of uniform thickness and continuous downward liquid film without deviation. The liquid film on the top of the first circular plate flows to the outer edge of the first circular plate and then falls into the circular groove on the top of the second circular plate through the gap between the conical cover and the first circular plate. After entering the circular groove, the liquid will flow downward into the drip hole under the action of gravity, so that the liquid returns to the absorbent in the purification box through the third circular plate and the needle. d. After the liquid in the right-angled trapezoidal groove is poured out, the weight of the right-angled trapezoidal block decreases sharply. The slide bar will return to the initial position on the inner wall of the annular plate under the drive of the spring. This will drive the right-angled trapezoidal block, the second circular plate and the needle to rise synchronously, so that the needle moves to the top of the absorbent liquid in the purification box and returns to the initial position. At the same time, under the torque of the torsion spring shaft, the right-angled trapezoidal block flips back to its original position. The magnetic attraction of the magnetic block will re-attract and reposition the bottom of the right-angled trapezoidal block, so that the right-angled trapezoidal groove on the right-angled trapezoidal block returns to the initial position and begins the next round of accumulation. This cycle repeats so that the downward liquid film at the top of the first circular plate is continuously formed. e. The flue gas to be treated is sent into the cavity of the third circular plate through the flue gas pipe. Under pressure, the flue gas rushes upward through the one-way valve in the connecting hole and enters the absorbent liquid at the bottom of the purification tank, making initial contact with the absorbent liquid and completing the first stage of denitrification reaction. Some flue gas may form bubbles on the surface of the absorbent liquid. The bubbles formed on the surface of the absorbent liquid will be quickly destroyed by the mechanical puncture of the needle and the hydraulic impact of the liquid flowing out of the drip hole. The flue gas wrapped in the bubbles is released into the space above the liquid surface. Under pressure, the released flue gas is squeezed through the downward liquid film that falls directly into the absorbent liquid in the purification tank, so as to achieve full contact between the flue gas and the absorbent liquid in the liquid film and achieve secondary fine denitrification. The flue gas squeezed by the liquid film continues to rise through the gap between the liquid film and the inner side wall of the purification tank and enters the treatment tank through the conduit. In the treatment tank, the flue gas passes through multiple layers of activated carbon purification mesh from bottom to top. The activated carbon adsorbs the residual trace harmful gases and odor components and finally discharges from the emission pipe. f. If the absorbent in the purification chamber needs to be replaced, first, prevent the flue gas from entering the cavity of the third circular plate through the flue gas pipe and turn off the circulation pump. Then, open the drain pipe through the control valve on the drain pipe to discharge the saturated absorbent in the purification chamber. Then, close the drain pipe through the control valve on the drain pipe and open the inlet pipe through the control valve on the inlet pipe to inject new nitrogen oxide absorbent into the purification chamber. Observe through the transparent observation window that the liquid level is higher than the third circular plate and lower than the bottom of the needle. Then, close the inlet pipe through the control valve on the inlet pipe. If the multi-layer activated carbon purification screen needs to be cleaned or replaced, first, unscrew the sealing cap and control the movement of the sealing cap to lift the limit rod upward, loosen the bottom nut, and pull out the multi-layer activated carbon purification screen for cleaning or replacement.

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