A nitrogen oxide treatment device

Abstract

The present invention belongs to the technical field of carbon neutralization treatment, and in particular relates to a nitrogen oxide treatment device, comprising a separation tower, a spray tower is arranged on the surrounding side of the separation tower, a dilution tower and a solidification tower are arranged on the surrounding side of the spray tower, and an air inlet pipe is fixed on the outer side of the separation tower; by arranging the separation tower, the spray tower, the dilution tower and the solidification tower, the nitric oxide in the nitrogen oxides can be separated in the inner cavity of the separation tower, the nitrogen dioxide can be converted into reusable concentrated nitric acid through chemical reaction in the inner cavity of the spray tower, a dilute nitric acid solution is obtained by arranging the dilution tower, and the solidification tower is arranged so that the carbon dioxide obtained by the reaction in the inner cavity of the spray tower can be condensed into dry ice. The device has a simple structure, and the decomposition rate and utilization rate of nitrogen oxides are extremely high, which greatly improves the treatment effect of harmful gases such as nitrogen oxides.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon neutralization, and in particular relates to a nitrogen oxide treatment device. Background Art

[0002] Nitrogen oxides mainly include nitrogen monoxide and nitrogen dioxide, which are one of the main pollutants in the atmosphere. The first way to prevent and control them is to remove nitrogen from smoke and the second is to control the production of nitrogen oxides.

[0003] Existing nitrogen oxide treatment can be divided into three categories according to the different purification principles: catalytic reduction, absorption and adsorption. Among them, absorption is the most common treatment method. The absorption method is a method of purifying the exhaust gas by absorbing nitrogen oxides in the exhaust gas with water or an aqueous solution of acid, alkali or salt. Existing enterprises generally use multi-stage alkaline solution to spray nitrogen oxide gas to purify the exhaust gas, but the treatment effect is not ideal. After the equipment has been running for a period of time, there is still a certain concentration of nitrogen oxide gas in the exhaust gas, which cannot meet the enterprise's exhaust gas emission requirements.

[0004] For example, a Chinese patent with publication number CN212757938U discloses a nitrogen oxide treatment device, including a base plate, a cooling tower is installed on the upper end of the base plate, a spray tower is installed on the upper end of the cooling tower, a tower head is integrally connected to the upper end of the spray tower, an exhaust port is connected to the upper end of the tower head, an air inlet is connected to the left end face of the spray tower, a cooling device is installed on the left side of the cooling tower, and a spray device is installed on the right side of the cooling tower. The structure is simple and the construction is clear and easy to understand. Nitrogen oxide gas enters from the air inlet, and a liquid pump extracts the spray liquid in the spray tower. The spray liquid flows along the vertical pipe, the liquid inlet pipe and the horizontal pipe, and is sprayed out through the spray head to spray the gas. In this process, the cooling water circulates between the water pump, the water tank and the cooling coil to realize the cooling of the spray liquid, so that the gas can also be cooled during the spraying process. The treatment effect is good and it is worth promoting.

[0005] This patent has some shortcomings when used, such as: the device sprays water on nitrogen oxides, uses nitrogen oxides to react with the spray liquid and cool to obtain secondary products. Since the multiple nozzles in the spray tower of the device are in a vertical distribution state, when the spray liquid is water, the device cannot fully treat the nitrogen monoxide in the nitrogen oxide tail gas, so that nitrogen oxides still exist in the final exhaust gas. When the spray liquid is a strong alkaline liquid, the spray nozzle is easily blocked, which reduces the purification effect of the gas. In order to ensure the purification effect, the equipment needs to be cleaned and replaced frequently regularly, which is labor-intensive and costly. In view of this, we propose a nitrogen oxide treatment device. Summary of the invention

[0006] The object of the present invention is to provide a nitrogen oxide treatment device to solve the problems raised in the above background technology.

[0007] In view of this, the present invention provides a nitrogen oxide treatment device, comprising:

[0008] A separation tower, a spray tower is arranged on the surrounding side of the separation tower, a dilution tower and a solidification tower are arranged on the surrounding side of the spray tower, an air inlet pipe is fixed on the outer side of the separation tower, a through pipe 1 is arranged between the separation tower and the spray tower, and an air pump is installed on the through pipe 1, a nitrogen generator is installed between the separation tower and the spray tower, and a vertical pipe is fixed on the output end of the nitrogen generator, a shunt pipe with an inverted U-shaped structure is fixed on the top of the vertical pipe, and the two ends of the shunt pipe respectively penetrate the upper surface of the separation tower and the spray tower and extend to the corresponding inner cavity;

[0009] A heating component, wherein the heating component is arranged at the bottom of the inner cavity of the separation tower;

[0010] A second through pipe, wherein the second through pipe is arranged between the spray tower and the dilution tower, and a water pump is installed on the second through pipe, and a drain pipe is fixed on the outer wall of the dilution tower at a lower position;

[0011] A primary spray assembly and a secondary spray assembly, wherein the primary spray assembly and the secondary spray assembly are respectively located on the spray tower and the dilution tower;

[0012] The curing mechanism is arranged in the inner cavity of the curing tower.

[0013] In the above technical solution, further, the heating component includes:

[0014] A placement frame is fixedly installed at the bottom of the inner cavity of the separation tower. The placement frame is an internal hollow structure with an open top. Fixed blocks are symmetrically fixed to the inner cavity of the placement frame, an electric heating tube is installed between two of the fixed blocks, and a protective mesh plate is installed at the top opening of the placement frame.

[0015] In the above technical solution, further, a diffusion hopper is fixed to one end of the diverter pipe located in the inner cavity of the separation tower and the spray tower.

[0016] In the present technical scheme, a diffusion hopper is provided in the inner cavity of the separation tower to increase the contact area between oxygen and nitric oxide, thereby improving the chemical reaction rate and thereby improving the separation rate of nitric oxide in the separation tower; a diffusion hopper is provided in the inner cavity of the spray tower to reduce the concentration of nitric oxide in the inner cavity of the spray tower, thereby improving the re-conversion rate of nitric oxide and increasing the production of concentrated nitric acid in the inner cavity of the spray head.

[0017] In the above technical solution, further, a plurality of staggered guide plates are fixed in the inner cavity of the separation tower and located directly below the diffusion hopper, the air inlet pipe is located above the guide plate, and one end of the through pipe close to the separation tower is arranged between the lowest guide plate and the placement frame.

[0018] In the present technical solution, by providing a plurality of guide plates, the contact time between nitrogen oxides and oxygen is prolonged, thereby improving the conversion rate of nitric oxide.

[0019] In the above technical solution, further, the first-level spray assembly includes:

[0020] A liquid storage tank is fixedly installed on the upper surface of the spray tower, a booster pump is installed in the inner cavity of the liquid storage tank, an annular connecting pipe is provided in the inner cavity of the spray tower, and the water inlet end of the annular connecting pipe passes through the inner top surface of the spray tower and extends to the inner cavity of the liquid storage tank to be connected with the output end of the booster pump, a plurality of mist nozzles equidistantly distributed in a circle are installed in the inner cavity of the spray tower and at the bottom of the annular tube of the annular connecting pipe, a feeding port is fixed on the upper surface of the liquid storage tank, and a plug is installed in the top opening of the feeding port.

[0021] In the above technical solution, further, the secondary spray assembly includes:

[0022] A liquid storage tank 2 is fixedly installed on the upper surface of the dilution tower, a booster pump 2 is installed in the inner cavity of the liquid storage tank 2, an annular connecting pipe 2 is provided in the inner cavity of the dilution tower, and the water inlet end of the annular connecting pipe 2 passes through the inner top surface of the dilution tower and extends to the inner cavity of the liquid storage tank 2 and is connected with the output end of the booster pump 2, a plurality of mist nozzles 2 distributed equidistantly in a circle are installed in the inner cavity of the dilution tower and at the bottom of the annular pipe of the annular connecting pipe 2, a feeding port 2 is fixed on the upper surface of the liquid storage tank 2, and a plug 2 is installed in the top opening of the feeding port 2.

[0023] In the above technical solution, further, a through pipe three is fixed between the spray tower and the solidification tower and at an upper position.

[0024] In the technical solution, by providing the through pipe three, the carbon dioxide in the spray tower can quickly enter the inner cavity of the solidification tower.

[0025] In the above technical solution, further, the curing mechanism includes:

[0026] A liquid oxygen spray pipe is annular in structure, and the input end of the liquid oxygen spray pipe passes through the inner top surface of the curing tower and extends to the outside. A plurality of spray heads distributed at equal intervals around the circumference are fixed on the lower surface of the annular tube of the liquid oxygen spray pipe, a mixed gas outlet is fixed on the upper surface of the curing tower, and a plurality of uniformly distributed curing plates are fixed in the inner cavity of the curing tower and directly below the plurality of spray heads.

[0027] In the above technical solution, further, a material taking port is provided at the bottom of the outer wall of the curing tower, and a cover plate is rotatably installed at the material taking port through a hinge.

[0028] In this technical solution, by providing a material taking port and a cover plate, it is convenient for operators to take out the dry ice in the inner cavity of the solidification tower to the outside.

[0029] In the above technical solution, further, the curing plate is in a W-shaped structure.

[0030] In the present technical solution, the W-shaped structure facilitates heat exchange between carbon dioxide and the surface of the solidification plate under the action of liquid oxygen, thereby quickly generating dry ice.

[0031] The beneficial effects of the present invention are:

[0032] 1. The nitrogen oxide treatment device is provided with a separation tower, and a heating component and oxygen increase are provided in the inner cavity of the separation tower. The heating component is used to increase the ambient temperature of the inner cavity of the separation tower, thereby increasing the reaction rate of nitric oxide and oxygen in the nitrogen oxides and reducing the time required for nitrogen oxide separation.

[0033] 2. The nitrogen oxide treatment device is provided with a spray tower, and oxygen is added in the inner cavity of the spray tower and a first-stage spray component is provided. The mist water droplets sprayed by the first-stage spray component react with nitrogen dioxide to obtain concentrated nitric acid, thereby improving the utilization rate of nitrogen oxides. The insolubility of nitric oxide in water is then utilized to allow nitric oxide to react with oxygen for a second time, thereby further improving the conversion rate of nitrogen oxides, so that the inner cavity of the spray tower can generate more concentrated nitric acid, thereby further improving the treatment effect of the device on nitrogen oxides.

[0034] 3. The nitrogen oxide treatment device uses water to dilute concentrated nitric acid by setting up a dilution tower and a secondary spray component, so that operators can obtain appropriate dilute nitric acid solution according to needs.

[0035] 4. The nitrogen oxide treatment device, by setting up a solidification tower and a solidification device in the inner cavity of the solidification tower, utilizes carbon dioxide and liquid oxygen for heat exchange to achieve condensation of carbon dioxide, and converts carbon dioxide into a usable dry ice state, thereby greatly improving the treatment effect and utilization rate of nitrogen oxides by the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 It is a cross-sectional schematic diagram of the separation tower and the spray tower in the present invention;

[0038] Figure 3 It is a structural schematic diagram of the heating component in the present invention;

[0039] Figure 4 It is a cross-sectional schematic diagram of the spray tower and the dilution tower in the present invention;

[0040] Figure 5 It is a structural schematic diagram of the curing mechanism in the present invention.

[0041] The symbols in the figure are:

[0042] 1. Separation tower; 2. Spray tower; 3. Dilution tower; 4. Solidification tower; 5. Air inlet pipe; 6. Through pipe 1; 7. Air pump; 8. Nitrogen generator; 9. Vertical pipe; 10. Diverter pipe; 11. Diffusion bucket; 12. Guide plate; 13. Placement frame; 14. Electric heating tube; 15. Fixed block; 16. Protective mesh plate; 17. Through pipe 2; 18. Water pump; 19. Drain pipe; 20. Through pipe 3; 21. Liquid oxygen spray pipe ; 22. Sprinkler head; 23. Mixed gas outlet; 24. Curing plate; 25. Material taking port; 26. Cover plate; 27. Liquid storage tank 1; 28. Booster pump 1; 29. ​​Ring connecting pipe 1; 30. Mist nozzle 1; 31. Feeding port 1; 32. Plug 1; 33. Liquid storage tank 2; 34. Booster pump 2; 35. Ring connecting pipe 2; 36. Mist nozzle 2; 37. Feeding port 2; 38. Plug 2. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1 - Figure 5 This application is described in further detail.

[0044] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0045] Embodiment 1:

[0046] This embodiment provides a nitrogen oxide treatment device, comprising:

[0047] A separation tower 1, a spray tower 2 is arranged on the surrounding side of the separation tower 1, a dilution tower 3 and a solidification tower 4 are arranged on the surrounding side of the spray tower 2, an air inlet pipe 5 is fixed on the outer side of the separation tower 1, a through pipe 6 is arranged between the separation tower 1 and the spray tower 2, and an air pump 7 is installed on the through pipe 6, a nitrogen generator 8 is installed between the separation tower 1 and the spray tower 2, and a vertical pipe 9 is fixed on the output end of the nitrogen generator 8, a shunt pipe 10 with an inverted U-shaped structure is fixed on the top of the vertical pipe 9, and the two ends of the shunt pipe 10 respectively penetrate the upper surfaces of the separation tower 1 and the spray tower 2 and extend to the corresponding inner cavity;

[0048] A heating component, the heating component is arranged at the bottom of the inner cavity of the separation tower 1;

[0049] The second through pipe 17 is arranged between the spray tower 2 and the dilution tower 3, and a water pump 18 is installed on the second through pipe 17. A drain pipe 19 is fixed on the outer wall of the dilution tower 3 and at a lower position;

[0050] The primary spray assembly and the secondary spray assembly are respectively located on the spray tower 2 and the dilution tower 3;

[0051] A curing mechanism, which is arranged in the inner cavity of the curing tower 4;

[0052] In this embodiment, the heating component includes:

[0053] A placing frame 13, which is fixedly installed at the bottom of the inner cavity of the separation tower 1. The placing frame 13 is a hollow structure with an open top. The inner cavity of the placing frame 13 is symmetrically fixed with fixing blocks 15. An electric heating tube 14 is installed between the two fixing blocks 15. A protective mesh plate 16 is installed at the top opening of the placing frame 13.

[0054] In this embodiment, the first-level spray assembly includes:

[0055] A liquid storage tank 27 is fixedly mounted on the upper surface of the spray tower 2. A booster pump 28 is installed in the inner cavity of the liquid storage tank 27. An annular connecting pipe 29 is provided in the inner cavity of the spray tower 2. The water inlet end of the annular connecting pipe 29 penetrates the inner top surface of the spray tower 2 and extends to the inner cavity of the liquid storage tank 27 to communicate with the output end of the booster pump 28. A plurality of mist nozzles 30 equidistantly distributed in a circle are installed in the inner cavity of the spray tower 2 and at the bottom of the annular tube of the annular connecting pipe 29. A charging port 31 is fixed on the upper surface of the liquid storage tank 27. A plug 32 is installed in the top opening of the charging port 31.

[0056] In this embodiment, the secondary spray assembly includes:

[0057] A second liquid storage tank 33 is fixedly mounted on the upper surface of the dilution tower 3. A second booster pump 34 is mounted in the inner cavity of the second liquid storage tank 33. A second annular connecting pipe 35 is disposed in the inner cavity of the dilution tower 3. The water inlet end of the second annular connecting pipe 35 penetrates the inner top surface of the dilution tower 3 and extends to the inner cavity of the second liquid storage tank 33 and is connected to the output end of the second booster pump 34. A plurality of mist nozzles 36 equidistantly distributed in a circle are mounted in the inner cavity of the dilution tower 3 and at the bottom of the annular connecting pipe 35. A second feeding port 37 is fixed on the upper surface of the second liquid storage tank 33. A second plug 38 is mounted on the top opening of the second feeding port 37.

[0058] In this embodiment, the curing mechanism includes:

[0059] The liquid oxygen spray pipe 21 has an annular structure, and the input end of the liquid oxygen spray pipe 21 passes through the inner top surface of the solidification tower 4 and extends to the outside. A plurality of spray heads 22 distributed at equal intervals around the circumference are fixed on the lower surface of the annular tube of the liquid oxygen spray pipe 21. A mixed gas outlet 23 is fixed on the upper surface of the solidification tower 4. A plurality of uniformly distributed solidification plates 24 are fixed in the inner cavity of the solidification tower 4 and directly below the plurality of spray heads 22.

[0060] The working principle of the present invention is as follows:

[0061] The nitrogen oxides are introduced into the inner cavity of the separation tower 1 from the air inlet pipe 5, and the heating component is started. At this time, the multiple electric heating tubes 14 work and generate heat, so that the inner cavity of the separation tower 1 is heated up, and the separated oxygen produced by the nitrogen generator 8 can be fully utilized or directly introduced into the air. The oxygen enters the diversion pipe 10 through the vertical pipe 9, and under the action of the diversion pipe 10, it is diverted into the inner cavity of the separation tower 1 and the spray tower 2. At this time, the oxygen in the inner cavity of the separation tower 1 fully reacts with the nitric oxide in the nitrogen oxides and generates nitrogen dioxide, thereby realizing the separation of nitric oxide. By setting the heating component, the temperature of the reaction environment is increased, and the reaction rate of oxygen and nitric oxide is greatly increased;

[0062] Start the air pump 7, so that the nitrogen dioxide obtained after the reaction enters the inner cavity of the spray tower 2 through the through pipe 6, and start the first-level spray assembly. At this time, the nitrogen dioxide contacts the water mist and generates concentrated nitric acid and a small amount of nitric oxide gas. Since the nitric oxide gas is insoluble in water, under the action of gravity, the concentrated nitric acid is deposited at the bottom of the inner cavity of the spray tower 2, while the nitric oxide rises and reacts with the oxygen sprayed from the diffusion bucket 11 in the spray tower 2 for a secondary reaction, and generates nitrogen dioxide again. Part of the generated nitrogen dioxide contacts the water mist and generates concentrated nitric acid and a smaller amount of nitric oxide again, and the cycle repeats, so that the concentration of concentrated nitric acid in the inner cavity of the spray tower 2 gradually increases; it is worth noting that when the first-level spray assembly is working, the booster pump 28 transports the water in the liquid storage tank 27 to the annular connecting pipe 29 and enters the annular pipe part in the inner cavity of the spray tower 2, and under the action of multiple mist nozzles 30, dense and uniform mist water droplets are sprayed;

[0063] When the concentrated nitric acid in the spray tower 2 needs to be diluted, the water pump 18 is started, and the water pump 18 transports the concentrated nitric acid at the bottom of the inner cavity of the spray tower 2 to the inner cavity of the dilution tower 3 through the through pipe 17. At this time, the secondary spray assembly is started, the booster pump 34 works, and the water in the liquid storage tank 33 is transported to the annular connecting pipe 35 and enters the annular pipe part in the inner cavity of the dilution tower 3. Under the action of multiple mist nozzles 36, dense and uniform mist water droplets are sprayed. The water droplets fall to the bottom of the dilution tower 3 under the action of gravity and combine with the concentrated nitric acid, thereby diluting the concentrated nitric acid. After the dilution is completed, a dilute nitric acid solution is obtained, and the dilute nitric acid solution is discharged to the outside through the drain pipe 19. It is worth adding that a valve is installed on the drain pipe 19, which is not pointed out in the drawings of the present invention. This is a prior art, and people in this field should be familiar with it. The present invention will not be repeated here.

[0064] Furthermore, in order to make the nitric acid in the spray tower 2 form a nitrate solution and be collected, a sodium carbonate solution can be added to the inner cavity of the liquid storage tank-27. The sodium carbonate solution forms a sodium carbonate spray under the action of multiple mist nozzles-30 and reacts with the nitric acid solution below. This process is a double replacement reaction. First, nitric acid and sodium carbonate undergo ion exchange to generate sodium nitrate and carbonic acid, and then the carbonic acid is further decomposed into carbon dioxide and water. In this process, the generated carbon dioxide will escape in the form of gas (chemical reaction equation: Na2C03.+·2HN03-->2NaN03·+.C02.+·H20);

[0065] In order to ensure that the carbon dioxide obtained by the reaction of nitrogen oxides in the inner cavity of the spray tower 2 is collected, the solidification tower 4 is used to solidify it. During solidification, the carbon dioxide enters the inner cavity of the solidification tower 4 through the through pipe 3 20, and the operator injects a low-temperature liquid oxygen solution into the liquid oxygen spray pipe 21 through the top opening of the liquid oxygen spray pipe 21. Under the action of multiple spray heads 22, the low-temperature liquid oxygen solution sprays dense liquid oxygen droplets and falls on the surface of multiple solidification plates 24 below. When the carbon dioxide contacts the liquid oxygen, it exchanges heat with the liquid oxygen attached to the solidification plate 24 through convection. The liquid oxygen is heated and vaporized into oxygen, and the carbon dioxide condenses into dry ice particles. Due to the action of gravity, the dry ice falls to the bottom of the solidification tower 4. A part of the carbon dioxide gas has not condensed into dry ice, and becomes a new mixed gas with the vaporized oxygen, and is discharged from the device through the mixed gas outlet 23.

[0066] By setting a separation tower 1, and setting a heating component and oxygenation in the inner cavity of the separation tower 1, the ambient temperature of the inner cavity of the separation tower 1 is increased by using the heating component, thereby increasing the reaction rate of nitric oxide in nitrogen oxides and oxygen, and reducing the time required for nitrogen oxide separation; by setting a spray tower 2, and performing oxygenation and setting a first-level spray component in the inner cavity of the spray tower 2, the mist water droplets sprayed by the first-level spray component react with nitrogen dioxide to obtain concentrated nitric acid, thereby improving the utilization rate of nitrogen oxides, and then using the property that nitric oxide is insoluble in water to make nitric oxide react with oxygen for a second time, further The conversion rate of nitrogen oxides is improved, so that the inner cavity of the spray tower 2 can generate more concentrated nitric acid, further improving the treatment effect of the device on nitrogen oxides; by setting up a dilution tower 3 and a secondary spray component, the concentrated nitric acid is diluted with water, so that the operator can obtain a suitable dilute nitric acid solution according to demand; by setting up a solidification tower 4 and setting a solidification device in the inner cavity of the solidification tower 4, heat exchange is performed with carbon dioxide and liquid oxygen to achieve condensation of carbon dioxide, and convert carbon dioxide into a usable dry ice state, which greatly improves the treatment effect and utilization rate of the device on nitrogen oxides.

[0067] Embodiment 2:

[0068] This embodiment provides a nitrogen oxide treatment device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: a diversion pipe 10 and a diffusion hopper 11 are fixed at one end of the separation tower 1 and the spray tower 2.

[0069] Among them, when oxygen enters the inner cavity of the separation tower 1 through the diverter pipe 10, it will be diffused by the diffusion bucket 11, so as to fully contact with the nitric oxide in the nitrogen oxides and undergo a chemical reaction, so that the nitric oxide generates nitrogen dioxide after reacting with oxygen, thereby realizing the separation of nitric oxide and the generation of nitrogen dioxide; at the same time, since part of the nitrogen dioxide in the inner cavity of the spray tower 2 will produce a small amount of nitric oxide in the process of generating concentrated nitric acid, by setting the diffusion bucket 11 in the inner cavity of the spray tower 2, the effect is the same as that of the diffusion bucket 11 in the separation tower 1, which reduces the concentration of nitric oxide in the inner cavity of the spray tower 2, improves the re-conversion rate of nitric oxide, and increases the production of concentrated nitric acid in the inner cavity of the spray head 22.

[0070] By setting a diffusion bucket 11 in the inner cavity of the separation tower 1, the contact area between oxygen and nitric oxide is increased, the chemical reaction rate is improved, and then the separation speed of nitric oxide in the separation tower 1 is improved; by setting a diffusion bucket 11 in the inner cavity of the spray tower 2, the concentration of nitric oxide in the inner cavity of the spray tower 2 is reduced, the re-conversion rate of nitric oxide is improved, and the production of concentrated nitric acid in the inner cavity of the spray head 22 is increased.

[0071] Embodiment 3:

[0072] The present embodiment provides a nitrogen oxide treatment device, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features: a plurality of staggered guide plates 12 are fixed in the inner cavity of the separation tower 1 and located directly below the diffusion hopper 11, the air inlet pipe 5 is located above the guide plate 12, and the through pipe 6 and one end close to the separation tower 1 is arranged between the lowest guide plate 12 and the placement frame 13.

[0073] Among them, the nitrogen oxide gas enters the inner cavity of the separation tower 1 from the air inlet pipe 5, and after chemically reacting with the oxygen sprayed from the diffusion bucket 11, it diffuses downward along the multi-layer staggered guide plates 12, and finally enters the inner cavity of the spray tower 2 from one end of the through pipe 6 at the lower part of the separation tower 1.

[0074] By providing a plurality of guide plates 12, the contact time between nitrogen oxides and oxygen is prolonged, thereby improving the conversion rate of nitrogen monoxide.

[0075] Embodiment 4:

[0076] This embodiment provides a nitrogen oxide treatment device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: a through pipe 20 is fixed between the spray tower 2 and the solidification tower 4 and at an upper position.

[0077] The carbon dioxide obtained by the reaction in the spray tower 2 can enter the inner cavity of the solidification tower 4 through the through pipe 3 20 .

[0078] By providing the through pipe 3 20 , the carbon dioxide in the spray tower 2 can quickly enter the inner cavity of the solidification tower 4 .

[0079] Embodiment 5:

[0080] This embodiment provides a nitrogen oxide treatment device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: a material intake port 25 is opened at the bottom of the outer wall of the solidification tower 4, and a cover plate 26 is rotatably installed at the material intake port 25 through a hinge.

[0081] The carbon dioxide gas becomes a solid state of dry ice after solidification and falls to the bottom of the inner cavity of the solidification tower 4 under the action of gravity. The operator can take out the dry ice in the inner cavity of the solidification tower 4 from the material taking port 25 by opening the cover plate 26.

[0082] The material taking port 25 and the cover plate 26 are provided to facilitate operators to take out the dry ice in the inner cavity of the solidification tower 4 to the outside.

[0083] Embodiment 6:

[0084] This embodiment provides a nitrogen oxide treatment device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the curing plate 24 is in a W-shaped structure.

[0085] The W-shaped structure facilitates heat exchange between carbon dioxide and liquid oxygen on the surface of the solidification plate 24, thereby quickly generating dry ice.

[0086] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A nitrogen oxide treatment device, characterized in that: include: A separation tower (1), wherein a spray tower (2) is arranged on the periphery of the separation tower (1), a dilution tower (3) and a solidification tower (4) are arranged on the periphery of the spray tower (2), an air inlet pipe (5) is fixed on the outer side of the separation tower (1), a through pipe (6) is arranged between the separation tower (1) and the spray tower (2), and an air pump (7) is installed on the through pipe (6), a nitrogen generator (8) is installed between the separation tower (1) and the spray tower (2), and a vertical pipe (9) is fixed at the output end of the nitrogen generator (8), a shunt pipe (10) in an inverted U-shaped structure is fixed at the top of the vertical pipe (9), and the two ends of the shunt pipe (10) respectively penetrate the upper surface of the separation tower (1) and the spray tower (2) and extend into the corresponding inner cavity; A heating component, the heating component being arranged at the bottom of the inner cavity of the separation tower (1); A second through pipe (17), the second through pipe (17) being arranged between the spray tower (2) and the dilution tower (3), and a water pump (18) being installed on the second through pipe (17), and a liquid discharge pipe (19) being fixed on the outer wall of the dilution tower (3) at a lower position; A primary spray assembly and a secondary spray assembly, wherein the primary spray assembly and the secondary spray assembly are respectively located on the spray tower (2) and the dilution tower (3); A curing mechanism is provided in the inner cavity of a curing tower (4); the curing mechanism comprises: a liquid oxygen spray pipe (21), the liquid oxygen spray pipe (21) is annular in structure, and the input end of the liquid oxygen spray pipe (21) penetrates the inner top surface of the curing tower (4) and extends to the outside, a plurality of spray heads (22) distributed at equal intervals in a circle are fixed on the lower surface of the annular tube of the liquid oxygen spray pipe (21), a mixed gas outlet (23) is fixed on the upper surface of the curing tower (4), and a plurality of uniformly distributed curing plates (24) are fixed in the inner cavity of the curing tower (4) and directly below the plurality of spray heads (22).

2. A nitrogen oxide treatment device according to claim 1, characterized in that: The heating assembly comprises: A placement frame (13), the placement frame (13) is fixedly installed at the bottom of the inner cavity of the separation tower (1), the placement frame (13) is an internally hollow structure with an open top, the inner cavity of the placement frame (13) is symmetrically fixed with fixed blocks (15), an electric heating tube (14) is installed between two of the fixed blocks (15), and a protective mesh plate (16) is installed at the top opening of the placement frame (13).

3. A nitrogen oxide treatment device according to claim 1, characterized in that: The diverter pipe (10) is fixed with a diffusion hopper (11) at one end located in the inner cavity of the separation tower (1) and the spray tower (2).

4. A nitrogen oxide treatment device according to claim 3, characterized in that: A plurality of staggered guide plates (12) are fixed in the inner cavity of the separation tower (1) and located directly below the diffusion hopper (11); the air inlet pipe (5) is located above the guide plate (12); and the through pipe (6) and one end close to the separation tower (1) is arranged between the lowest guide plate (12) and the placement frame (13).

5. The nitrogen oxide treatment device according to claim 1, characterized in that: The first-level spray assembly comprises: A liquid storage tank (27) is fixedly mounted on the upper surface of the spray tower (2); a booster pump (28) is mounted in the inner cavity of the liquid storage tank (27); an annular connecting pipe (29) is arranged in the inner cavity of the spray tower (2); a water inlet end of the annular connecting pipe (29) penetrates the inner top surface of the spray tower (2) and extends to the inner cavity of the liquid storage tank (27) and is connected to the output end of the booster pump (28); a plurality of mist nozzles (30) are mounted in the inner cavity of the spray tower (2) and at the bottom of the annular tube of the annular connecting pipe (29) and are equidistantly distributed around the circumference; a feeding port (31) is fixedly mounted on the upper surface of the liquid storage tank (27); a plug (32) is installed in the top opening of the feeding port (31).

6. A nitrogen oxide treatment device according to claim 1, characterized in that: The secondary spray assembly comprises: A second liquid storage tank (33) is fixedly mounted on the upper surface of the dilution tower (3); a second booster pump (34) is mounted in the inner cavity of the second liquid storage tank (33); a second annular connecting pipe (35) is arranged in the inner cavity of the dilution tower (3); a water inlet end of the second annular connecting pipe (35) penetrates the inner top surface of the dilution tower (3) and extends to the inner cavity of the second liquid storage tank (33) and is connected to the output end of the second booster pump (34); a plurality of second mist nozzles (36) equidistantly distributed in a circumference are mounted in the inner cavity of the dilution tower (3) and at the bottom of the annular pipe of the second annular connecting pipe (35); a second feeding port (37) is fixedly mounted on the upper surface of the second liquid storage tank (33); a second plug (38) is installed in the top opening of the second feeding port (37).

7. The nitrogen oxide treatment device according to claim 1, characterized in that: A through pipe three (20) is fixed between the spray tower (2) and the solidification tower (4) and at an upper position.

8. The nitrogen oxide treatment device according to claim 1, characterized in that: A material taking opening (25) is provided on the outer wall of the curing tower (4) near the bottom, and a cover plate (26) is rotatably mounted on the material taking opening (25) via a hinge.

9. A nitrogen oxide treatment device according to claim 8, characterized in that: The curing plate (24) has a W-shaped structure.

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