A desulfurization and denitrification treatment system and treatment process

Abstract

The present invention is used in the technical field of flue gas treatment, and discloses a desulfurization and denitration treatment system, including a first reaction tower, a second reaction tower is fixedly arranged on the upper side surface of the first reaction tower, and a first injection pipe is arranged on the upper ends of the first reaction tower and the second reaction tower, a partition plate is fixedly arranged on the inner side surface of the lower end of the second reaction tower, and an intermittent exhaust mechanism is arranged on the outer side of the central column, and the exhaust gas is fully reacted in the first reaction tower and the second reaction tower by intermittent exhaust. The desulfurization and denitration treatment system, by connecting the first reaction tower and the second reaction tower in series for continuous treatment, greatly reduces the concentration of sulfur oxides in the flue gas after desulfurization, protects the activity and service life of the denitration catalyst, reduces the adverse effects on the catalyst, and even if there is a small amount of sulfur residue, its concentration is within the range that the denitration catalyst can bear, reducing the corrosion and damage of sulfur to the catalyst.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment, and in particular to a desulfurization and denitrification treatment system and a treatment process. Background Art

[0002] With the acceleration of industrialization and the continuous growth of energy consumption, the problem of air pollution is becoming increasingly serious. Among them, sulfur oxides and nitrogen oxides are one of the main air pollutants. Their emissions have caused great harm to the environment and human health. In traditional industrial production, the combustion of fossil fuels such as coal and oil is the main source of sulfur oxides and nitrogen oxides. In order to reduce the emission of these pollutants, people have developed various desulfurization and denitrification technologies. At present, common desulfurization technologies mainly include wet desulfurization, dry desulfurization and semi-dry desulfurization. Wet desulfurization technology uses alkaline solution to react with sulfur dioxide in flue gas to generate sulfite or sulfate, so as to achieve the purpose of desulfurization. Dry desulfurization technology uses solid adsorbents to adsorb sulfur dioxide in flue gas, or uses catalysts to oxidize sulfur dioxide to sulfur trioxide, and then reacts with alkaline substances to generate sulfates. Semi-dry desulfurization technology is a desulfurization technology between wet and dry methods. It usually uses spray drying to spray alkaline solution into flue gas to react sulfur dioxide with alkaline substances to generate sulfite or sulfate.

[0003] Common denitrification technologies include selective catalytic reduction, selective non-catalytic reduction and oxidation absorption. SCR technology uses ammonia to reduce nitrogen oxides in flue gas to nitrogen and water under the action of a catalyst. SNCR technology sprays ammonia or urea and other reducing agents into flue gas at high temperature to reduce nitrogen oxides to nitrogen. Oxidation absorption method first oxidizes nitrogen oxides in flue gas to high-valent nitrogen oxides, and then absorbs them with alkaline solution to achieve the purpose of denitrification.

[0004] However, most of the existing desulfurization and denitrification technologies have the following problems:

[0005] First, traditional desulfurization and denitrification technologies are usually carried out separately, requiring two independent sets of equipment and process flows, which not only increases equipment investment and floor space, but also increases operating costs and maintenance difficulties. Secondly, existing denitrification technologies will produce some by-products during operation, such as ammonium sulfate, ammonium sulfite, etc. If these by-products are not effectively treated, they will cause secondary pollution to the environment. At the same time, the by-products accumulate in the reaction tower and are not easy to clean up in time, which will cause the inner wall of the reaction tower to be easily corroded during long-term use, which is not conducive to extending the service life of the reaction tower. Summary of the invention

[0006] The object of the present invention is to provide a desulfurization and denitrification treatment system and treatment process to solve the problems of poor treatment process, poor by-product treatment method and easy corrosion of treatment equipment proposed in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a desulfurization and denitrification treatment system, comprising a first reaction tower, a second reaction tower is fixedly arranged on an upper side surface of the first reaction tower, and a first injection pipe is arranged on the upper ends of the first reaction tower and the second reaction tower, a partition plate is fixedly arranged on the inner side surface of the lower end of the second reaction tower, and an exhaust pipe is opened on the side surface of the second reaction tower below the partition plate, and an exhaust ring is fixedly arranged on the lower side surface of the second reaction tower, a connecting pipe is connected between one end of the exhaust ring and the first injection pipe at the upper end of the first reaction tower, a guide pipe is fixedly arranged on the outer side surface of the lower end of the first reaction tower, a rotating second injection pipe is installed in the middle of the upper ends of the first reaction tower and the second reaction tower, and a central column is fixedly arranged on the lower end of the second injection pipe, and an intermittent exhaust mechanism is arranged on the outer side of the central column, so as to ensure that the exhaust gas is fully reacted in the first reaction tower and the second reaction tower by means of intermittent exhaust;

[0008] The intermittent exhaust mechanism includes: an injection barrel, which is fixedly arranged on the outer surface of the central column, and a first one-way valve is fixedly arranged at one end of the injection barrel that passes through the inner surface of the central column, and a second one-way valve is fixedly arranged on the outer surface of the injection barrel, a sliding piston plate is installed inside one end of the injection barrel facing the outside of the first reaction tower and the second reaction tower, and one end of the piston plate passes through the outer surface of the injection barrel, and a first magnetic block is fixedly arranged at the end of the piston plate located outside the injection barrel, a second magnetic block is fixedly arranged on the outer surfaces of the first reaction tower and the second reaction tower facing the first magnetic block, a first drive motor is fixedly arranged on the outer surface of the partition plate, and a second drive motor is fixedly arranged on the inner bottom surface of the first reaction tower.

[0009] Preferably, a scraper is fixedly provided on the outer surface of the central column inside the second reaction tower, and the lower end of the guide tube is fixedly connected to the outer surface of the upper end of the scraper, and a swivel is fixedly connected to the upper end of the guide tube, and an injection cavity is fixedly provided on the upper surface of the second reaction tower, and a plug connector is fixedly installed on the upper surface of the injection cavity.

[0010] By adopting the above technical solution, the scraper can scrape off the by-products.

[0011] Preferably, a closed discharging structure is provided at the lower end of the second reaction tower, and the by-products are discharged in a closed state of the second reaction tower by continuously collecting the by-products. The closed discharging structure includes: a switching motor, which is fixedly installed inside the side surface of the second reaction tower, and the output shaft of the switching motor passes through the inner surface of the second reaction tower, and one end of the output shaft of the switching motor is fixedly connected to a discharging ball, and the outer surfaces at both ends of the discharging ball are provided with discharging grooves.

[0012] By adopting the above technical solution, the discharge balls can discharge the fallen by-products through the discharge chute.

[0013] Preferably, a plug-in block is fixedly provided on the outer surface of the first reaction tower, and the outer surface of the first reaction tower where the plug-in block is located is penetrated by the catalyst storage barrel, and a limiting rod is fixedly provided on the outer surface of one end of the catalyst storage barrel.

[0014] The above technical solution enables the catalyst storage barrel to be easily replaced.

[0015] Preferably, the partition plate is designed as a downward hollow conical barrel, and the lower end of the second reaction tower below the partition plate is open, and the vertical projection of the partition plate completely coincides with the vertical projection of the upper end opening of the exhaust pipe, the lower end of the exhaust pipe passes through the outer surface of the second reaction tower, and one end of the exhaust pipe passing through the outer surface of the second reaction tower is arranged opposite to the exhaust ring.

[0016] By adopting the above technical solution, the partition plate can prevent the fallen by-products from falling into the exhaust pipe.

[0017] Preferably, the piston plate is connected to the injection barrel by sliding friction, and a spring is connected between the piston plate and the injection barrel, and one end of the piston plate that passes through the outer surface of the injection barrel is slidingly connected to the injection barrel, the first magnetic block and the second magnetic block have the same magnetic pole at one end facing each other, the output shaft of the first drive motor is fixedly connected to the center column inside the second reaction tower, and the output shaft of the second drive motor is fixedly connected to the center column inside the first reaction tower.

[0018] By adopting the above technical solution, the first magnetic block can press out the material injected into the barrel under the repulsion of the second magnetic block.

[0019] Preferably, the scraper is evenly distributed on the outer surface of the central column, and the outer surface of the scraper is in contact with the inner surface of the second reaction tower, and the side surface of one end of the scraper in contact with the second reaction tower is hollow, the longitudinal section of the swivel is C-shaped, and the upper end of the swivel is in contact with the inner top surface of the second reaction tower, and the hollow part of one end of the scraper is connected with the lower surface of the swivel through the guide tube.

[0020] By adopting the above technical solution, the scraper can perform corrosion protection treatment on the inner wall of the second reaction tower while scraping off the by-products.

[0021] Preferably, both ends of the discharge ball are designed as cross sections, and the discharge ball is rotationally connected to the second reaction tower in a tight fit, and the two discharge troughs are not connected to each other.

[0022] By adopting the above technical solution, the two discharge troughs can complete the discharge of by-products while keeping the second reaction tower relatively closed.

[0023] Preferably, the plug-in block is of arc-shaped design, one end of the catalyst storage barrel located outside the first reaction tower is in contact with the outer surface of the first reaction tower, the limiting rod is of arc-shaped rod design, and the limiting rod and the plug-in block are tightly fitted and installed.

[0024] By adopting the above technical solution, the catalyst storage barrel can be stably plugged and installed with the first reaction tower.

[0025] A treatment process for a desulfurization and denitrification treatment system comprises the following steps:

[0026] S1. During the treatment process, the flue gas is first injected into the second reaction tower through the first injection pipe at the upper end of the second reaction tower. After the flue gas reacts, it is injected into the first injection pipe at the upper end of the first reaction tower through the exhaust pipe, the exhaust ring and the connecting pipe. After the flue gas reacts inside the first reaction tower, it is discharged to the outside through the outlet pipe. The lime slurry and the reducing agent are combined with the catalyst for continuous desulfurization and denitrification treatment.

[0027] S2. The solid by-products produced by the reaction are scraped off by the scraper, and the switching motor drives the discharging ball to rotate so that the two discharging troughs are interchanged to realize the dumping of the by-products;

[0028] S3. The ammonium sulfate and ammonium sulfite generated by ammonia escape in the denitration reaction of the first reaction tower are collected by pre-adding sodium hydroxide solution into the first reaction tower, and then the ammonium sulfate and ammonium sulfite are added to the lime slurry in the desulfurization reaction, and the denitration by-products are utilized by reacting ammonium salt with sulfur dioxide.

[0029] Compared with the prior art, the beneficial effects of the present invention are: the desulfurization and denitrification treatment system:

[0030] 1. The first reaction tower and the second reaction tower are connected in series for continuous treatment, so that the concentration of sulfur oxides in the flue gas after desulfurization is greatly reduced, and the sulfur dioxide in the flue gas is prevented from reacting with the reducing agent used in the denitrification process to generate ammonium sulfate, ammonium bisulfate and other substances. These substances will adhere to the surface of the denitrification catalyst, causing the catalyst to be poisoned and deactivated, and reducing the denitrification efficiency. Desulfurization before denitrification can avoid this situation, protect the activity and service life of the denitrification catalyst, and reduce the adverse effects on the catalyst. Even if there is a small amount of sulfur residue, its concentration is within the range that the denitrification catalyst can bear, reducing the corrosion and damage of sulfur to the catalyst and ensuring the stable operation of the denitrification system;

[0031] Furthermore, the flue gas after desulfurization is relatively purer, reducing substances that may compete with or interfere with the denitrification reaction, so that the denitrification reaction can be carried out under more favorable conditions. Without the influence of sulfur oxides, the contact and reaction between the denitrification reductant and nitrogen oxides are more complete, thereby improving the efficiency of denitrification;

[0032] 2. The central column rotates continuously during the reaction process, so that the injection barrel can evenly press the lime slurry into the first reaction tower and the second reaction tower when it rotates to the second magnetic block, so that the lime slurry can be fully mixed with the flue gas to be treated, thereby ensuring the treatment effect of the flue gas;

[0033] Furthermore, the injection barrel stirs the exhaust gas during the rotation process so that the ejected lime slurry can be better mixed with the flue gas, and the scraper rotating with the central column can scrape the reaction byproducts on the inner surface of the second reaction tower, thereby preventing the reaction byproducts from adhering to the inner surface of the second reaction tower for a long time and reducing the corrosion degree of the inner surface of the second reaction tower;

[0034] Furthermore, by injecting a neutralizing agent into the rotating ring through the injection cavity, the scraper can scrape off the by-products while maintaining the inner surface of the second reaction tower, thereby further extending the service life of the second reaction tower;

[0035] 3. The switching motor is used to drive the discharging ball to rotate, so that the by-products produced in the second reaction tower and the by-products scraped off can be discharged through the discharging trough facing upward in turn while keeping the second reaction tower relatively closed, thereby achieving efficient treatment of the by-products;

[0036] 4. The catalyst storage barrel is inserted into the first reaction tower and then rotated to engage with the first reaction tower, so that the catalyst storage barrel can remain stably plugged in during the reaction process. When the catalyst storage barrel needs to be replaced, it only needs to be rotated and pulled out to quickly complete the disassembly of the catalyst storage barrel, thereby achieving the purpose of quickly replacing the catalyst storage barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0038] Figure 2 It is a schematic diagram of the three-dimensional structure of the connection between the first reaction tower, the second reaction tower and the exhaust ring of the present invention;

[0039] Figure 3 It is a schematic diagram of the three-dimensional structure of the overall cutaway surface of the present invention;

[0040] Figure 4 This is a three-dimensional structural schematic diagram of the connection section of the injection barrel, the piston plate and the first magnetic block of the present invention;

[0041] Figure 5 It is a three-dimensional structural schematic diagram of the cross-section surface connecting the discharge ball and the discharge trough of the present invention;

[0042] Figure 6 It is a three-dimensional structural schematic diagram of the connection section of the scraper, the guide tube and the swivel of the present invention;

[0043] Figure 7 It is a schematic diagram of the three-dimensional structure of the cross-section surface of the exhaust pipe, the exhaust ring and the connecting pipe of the present invention;

[0044] Figure 8 This is a schematic diagram of the three-dimensional structure of the connection between the first reaction tower and the catalyst storage barrel of the present invention;

[0045] Fig. 9 It is a three-dimensional structural schematic diagram of the cross-section surface of the connection between the plug-in block and the limit rod of the present invention.

[0046] In the figure: 1. first reaction tower; 2. second reaction tower; 3. first injection pipe; 4. partition plate; 5. exhaust pipe; 6. exhaust ring; 7. connecting pipe; 8. outlet pipe; 9. second injection pipe; 10. center column; 11. injection barrel; 12. first one-way valve; 13. second one-way valve; 14. piston plate; 15. first magnetic block; 16. second magnetic block; 17. first drive motor; 18. second drive motor; 19. scraper; 20. guide pipe; 21. swivel; 22. injection chamber; 23. plug connector; 24. switching motor; 25. discharge ball; 26. discharge trough; 27. plug block; 28. catalyst storage barrel; 29. ​​limit rod. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] See also Figure 1-Figure 9 The present invention provides a technical solution: a desulfurization and denitrification treatment system.

[0049] Embodiment 1: This embodiment discloses a first reaction tower 1, a second reaction tower 2 is fixedly arranged on an upper side surface of the first reaction tower 1, and a first injection pipe 3 is arranged on the upper ends of the first reaction tower 1 and the second reaction tower 2, a partition plate 4 is fixedly arranged on the inner side surface of the lower end of the second reaction tower 2, and an exhaust pipe 5 is opened on the side surface of the second reaction tower 2 below the partition plate 4, and an exhaust ring 6 is fixedly arranged on the lower side surface of the second reaction tower 2, a connecting pipe 7 is connected between one end of the exhaust ring 6 and the first injection pipe 3 at the upper end of the first reaction tower 1, a guide pipe 8 is fixedly arranged on the outer side surface of the lower end of the first reaction tower 1, a rotating second injection pipe 9 is installed in the middle of the upper ends of the first reaction tower 1 and the second reaction tower 2, and a central column 10 is fixedly arranged on the lower end of the second injection pipe 9, and an intermittent exhaust mechanism is arranged on the outer side of the central column 10, and the exhaust gas is ensured to be fully reacted in the first reaction tower 1 and the second reaction tower 2 by intermittent exhaust;

[0050] The intermittent exhaust mechanism includes: an injection barrel 11, the injection barrel 11 is fixedly arranged on the outer surface of the central column 10, and a first one-way valve 12 is fixedly arranged at one end of the injection barrel 11 that passes through the inner surface of the central column 10, and a second one-way valve 13 is fixedly installed on the outer surface of the injection barrel 11, a sliding piston plate 14 is installed inside one end of the injection barrel 11 that faces the outside of the first reaction tower 1 and the second reaction tower 2, and one end of the piston plate 14 passes through the outer surface of the injection barrel 11, and a first magnetic block 15 is fixedly arranged at one end of the piston plate 14 that is located outside the injection barrel 11, a second magnetic block 16 is fixedly arranged on the outer surfaces of the first reaction tower 1 and the second reaction tower 2 that the first magnetic block 15 faces, a first drive motor 17 is fixedly installed on the outer surface of the partition plate 4, and a second drive motor 18 is fixedly installed on the inner bottom surface of the first reaction tower 1;

[0051] The partition plate 4 is designed as a downward hollow cone barrel, and the lower end of the second reaction tower 2 below the partition plate 4 is open, and the vertical projection of the partition plate 4 completely coincides with the vertical projection of the upper end opening of the exhaust pipe 5, the lower end of the exhaust pipe 5 passes through the outer surface of the second reaction tower 2, and one end of the exhaust pipe 5 passing through the outer surface of the second reaction tower 2 is arranged opposite to the exhaust ring 6;

[0052] The piston plate 14 is connected to the injection barrel 11 by sliding friction, and a spring is connected between the piston plate 14 and the injection barrel 11, and one end of the piston plate 14 that passes through the outer surface of the injection barrel 11 is connected to the injection barrel 11 by sliding, the first magnetic block 15 and the second magnetic block 16 have the same magnetic pole at one end facing each other, the output shaft of the first drive motor 17 is fixedly connected to the central column 10 inside the second reaction tower 2, and the output shaft of the second drive motor 18 is fixedly connected to the central column 10 inside the first reaction tower 1;

[0053] A scraper 19 is fixedly provided on the outer surface of the central column 10 inside the second reaction tower 2, and the lower end of the guide tube 20 is fixedly connected to the outer surface of the upper end of the scraper 19, and a swivel 21 is fixedly connected to the upper end of the guide tube 20, and an injection cavity 22 is fixedly provided on the upper surface of the second reaction tower 2, and a plug connector 23 is fixedly installed on the upper surface of the injection cavity 22;

[0054] The scrapers 19 are evenly distributed on the outer surface of the central column 10, and the outer surface of the scrapers 19 fits with the inner surface of the second reaction tower 2, and the side surface of one end of the scrapers 19 that fits with the second reaction tower 2 is hollow, the longitudinal section of the swivel 21 is C-shaped, and the upper end of the swivel 21 fits with the inner top surface of the second reaction tower 2, and the hollow part of one end of the scrapers 19 is connected with the lower surface of the swivel 21 through the guide tube 20;

[0055] During the treatment process, the flue gas is first injected into the second reaction tower 2 through the first injection pipe 3 at the upper end of the second reaction tower 2. After the flue gas reacts, it is injected into the first injection pipe 3 at the upper end of the first reaction tower 1 through the exhaust pipe 5, the exhaust ring 6 and the connecting pipe 7. After the flue gas reacts inside the first reaction tower 1, it is discharged to the outside through the outlet pipe 8.

[0056] When the flue gas enters the second reaction tower 2, the first drive motor 17 starts to drive the central column 10 to rotate inside the second reaction tower 2, and the lime slurry is injected into the central column 10 through the second injection pipe 9. When the first magnetic block 15 rotates away from the second magnetic block 16, the first magnetic block 15 slides through the first one-way valve 12 driven by the spring between the piston plate 14 and the injection barrel 11 to suck the lime slurry into the injection barrel 11. When the injection barrel 11 drives the first magnetic block 15 to rotate to face the second magnetic block 16, the first magnetic block 15 drives the piston plate 14 to slide through the second one-way valve 13 under the repulsion of the second magnetic block 16 to spray the lime slurry into the second reaction tower 2 to be fully mixed with the flue gas.

[0057] During the reaction, the solid by-products produced by the reaction adhere to the inner surface of the second reaction tower 2. At this time, as the central column 10 rotates, the scraper 19 scrapes off the by-products on the inner surface of the second reaction tower 2. The solid by-products fall downward under the guidance of the partition plate 4 to prevent them from falling into the exhaust pipe 5. At the same time, the neutralizing agent injected into the injection chamber 22 through the plug connector 23 flows into the scraper 19 through the rotating ring 21 and the guide pipe 20. During the scraping process, the scraper 19 neutralizes and protects the corrosive substances on the inner surface of the second reaction tower 2 through the neutralizing agent.

[0058] Embodiment 2: Based on Embodiment 1, this embodiment discloses that a closed discharge structure is provided at the lower end of the second reaction tower 2, and the by-products are discharged in a closed state of the second reaction tower 2 by continuously collecting the by-products. The closed discharge structure includes: a switching motor 24, the switching motor 24 is fixedly installed inside the side surface of the second reaction tower 2, and the output shaft of the switching motor 24 passes through the inner surface of the second reaction tower 2, and one end of the output shaft of the switching motor 24 is fixedly connected to a discharge ball 25, and the outer surfaces of both ends of the discharge ball 25 are provided with discharge grooves 26;

[0059] Both ends of the discharge ball 25 are designed as cross sections, and the discharge ball 25 and the second reaction tower 2 are tightly fitted and rotatably connected, and the two discharge troughs 26 are not connected to each other;

[0060] After the by-product falls, the switching motor 24 drives the discharge ball 25 to rotate so that the two discharge troughs 26 exchange positions. At this time, the empty discharge trough 26 rotates upward to continue to receive the by-product, and the discharge trough 26 filled with the by-product rotates downward to dump the by-product. During the switching process of the discharge trough 26, the discharge ball 25 closes the opening at the lower end of the second reaction tower 2 to ensure that the second reaction tower 2 is not directly connected to the external air.

[0061] Embodiment 3: Based on Embodiment 1 and Embodiment 2, this embodiment discloses that a plug-in block 27 is fixedly provided on the outer surface of the first reaction tower 1, and the outer surface of the first reaction tower 1 where the plug-in block 27 is located is penetrated by a catalyst storage barrel 28, and a limit rod 29 is fixedly provided on the outer surface of one end of the catalyst storage barrel 28;

[0062] The plug-in block 27 is of arc-shaped design, one end of the catalyst storage barrel 28 located outside the first reaction tower 1 is in contact with the outer surface of the first reaction tower 1, the limiting rod 29 is of arc-shaped rod design, and the limiting rod 29 and the plug-in block 27 are tightly fitted and installed;

[0063] After the flue gas enters the first reaction tower 1, the second drive motor 18 starts to drive the central column 10 to rotate inside the first reaction tower 1, and the reducing agent is injected into the central column 10 through the second injection pipe 9. When the first magnetic block 15 rotates away from the second magnetic block 16, the first magnetic block 15 slides through the first one-way valve 12 driven by the spring between the piston plate 14 and the injection barrel 11 to suck the reducing agent into the injection barrel 11. When the injection barrel 11 drives the first magnetic block 15 to rotate to face the second magnetic block 16, the first magnetic block 15 drives the piston plate 14 to slide through the second one-way valve 13 under the repulsion of the second magnetic block 16 to spray the reducing agent into the first reaction tower 1 to be fully mixed with the flue gas. The catalyst storage barrel 28 realizes denitration treatment by cooperating with the reducing agent and heating it externally.

[0064] When the catalyst storage barrel 28 needs to be replaced, rotate the catalyst storage barrel 28 so that the limiting rod 29 is disengaged from the plug-in block 27, slide the catalyst storage barrel 28 out and insert the new catalyst storage barrel 28 into the first reaction tower 1, rotate the catalyst storage barrel 28 so that the limiting rod 29 is engaged with the plug-in block 27, and the replacement of the catalyst storage barrel 28 is completed.

[0065] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. A desulfurization and denitrification treatment system, comprising a first reaction tower (1), a second reaction tower (2) being fixedly arranged on an upper side surface of the first reaction tower (1), and a first injection pipe (3) being arranged at the upper ends of the first reaction tower (1) and the second reaction tower (2), a partition plate (4) being fixedly arranged on the inner side surface of the lower end of the second reaction tower (2), and an exhaust pipe (5) being provided on the side surface of the second reaction tower (2) below the partition plate (4), and an exhaust ring (6) being fixedly arranged on the lower side surface of the second reaction tower (2), a connecting pipe (7) being connected between one end of the exhaust ring (6) and the first injection pipe (3) at the upper end of the first reaction tower (1), and an outlet pipe (8) being fixedly arranged on the outer side surface of the lower end of the first reaction tower (1), characterized in that: A rotatable second injection pipe (9) is installed in the middle of the upper ends of the first reaction tower (1) and the second reaction tower (2), and a central column (10) is fixedly arranged at the lower end of the second injection pipe (9), and an intermittent exhaust mechanism is arranged on the outer side of the central column (10), so as to ensure that the waste gas is fully reacted in the first reaction tower (1) and the second reaction tower (2) by means of intermittent exhaust; The intermittent exhaust mechanism comprises: an injection barrel (11), the injection barrel (11) being fixedly arranged on the outer surface of the central column (10), and a first one-way valve (12) being fixedly arranged at one end of the injection barrel (11) penetrating the inner surface of the central column (10), and a second one-way valve (13) being fixedly arranged on the outer surface of the injection barrel (11), a sliding piston plate (14) being installed inside one end of the injection barrel (11) facing the outside of the first reaction tower (1) and the second reaction tower (2), and one end of the piston plate (14) penetrating the outer surface of the injection barrel (11), and a first magnetic block (15) being fixedly arranged at one end of the piston plate (14) located outside the injection barrel (11), and a second magnetic block (16) being fixedly arranged on the outer surfaces of the first reaction tower (1) and the second reaction tower (2) facing the first magnetic block (15), a first driving motor (17) being fixedly arranged on the outer surface of the partition plate (4), and a second driving motor (18) being fixedly arranged on the inner bottom surface of the first reaction tower (1); A scraper (19) is fixedly provided on the outer surface of the central column (10) inside the second reaction tower (2), and the lower end of the guide tube (20) is fixedly connected to the outer surface of the upper end of the scraper (19), and a swivel (21) is fixedly connected to the upper end of the guide tube (20); an injection cavity (22) is fixedly provided on the upper surface of the second reaction tower (2), and a plug connector (23) is fixedly installed on the upper surface of the injection cavity (22); The lower end of the second reaction tower (2) is provided with a closed discharge structure, and the by-products are discharged in a closed state of the second reaction tower (2) by continuously collecting the by-products. The closed discharge structure comprises: a switching motor (24), the switching motor (24) is fixedly mounted inside the side surface of the second reaction tower (2), and the output shaft of the switching motor (24) passes through the inner surface of the second reaction tower (2), and one end of the output shaft of the switching motor (24) is fixedly connected to a discharge ball (25), and the outer surfaces of both ends of the discharge ball (25) are provided with discharge grooves (26).

2. A desulfurization and denitrification treatment system according to claim 1, characterized in that: A plug-in block (27) is fixedly provided on the outer surface of the first reaction tower (1), and the outer surface of the first reaction tower (1) where the plug-in block (27) is located is penetrated by a catalyst storage barrel (28), and a limiting rod (29) is fixedly provided on the outer surface of one end of the catalyst storage barrel (28).

3. A desulfurization and denitrification treatment system according to claim 1, characterized in that: The partition plate (4) is designed as a downwardly directed hollow conical barrel, and the lower end of the second reaction tower (2) below the partition plate (4) is arranged to be open, and the vertical projection of the partition plate (4) completely coincides with the vertical projection of the upper end opening of the exhaust pipe (5), the lower end of the exhaust pipe (5) penetrates the outer surface of the second reaction tower (2), and one end of the exhaust pipe (5) that penetrates the outer surface of the second reaction tower (2) is arranged to face the exhaust ring (6).

4. A desulfurization and denitrification treatment system according to claim 1, characterized in that: The piston plate (14) is connected to the injection barrel (11) by sliding friction, and a spring is connected between the piston plate (14) and the injection barrel (11), and one end of the piston plate (14) that passes through the outer surface of the injection barrel (11) is connected to the injection barrel (11) by sliding connection, the first magnetic block (15) and the second magnetic block (16) have the same magnetic pole at one end facing each other, the output shaft of the first drive motor (17) is fixedly connected to the central column (10) inside the second reaction tower (2), and the output shaft of the second drive motor (18) is fixedly connected to the central column (10) inside the first reaction tower (1).

5. A desulfurization and denitrification treatment system according to claim 1, characterized in that: The scrapers (19) are evenly distributed on the outer surface of the central column (10), and the outer surface of the scrapers (19) is in contact with the inner surface of the second reaction tower (2), and the side surface of one end of the scrapers (19) in contact with the second reaction tower (2) is hollow, the longitudinal section of the rotating ring (21) is C-shaped, and the upper end of the rotating ring (21) is in contact with the inner top surface of the second reaction tower (2), and the hollow portion of one end of the scrapers (19) is connected to the lower surface of the rotating ring (21) through the guide tube (20).

6. A desulfurization and denitrification treatment system according to claim 1, characterized in that: Both ends of the discharge ball (25) are designed as cross-sections, and the discharge ball (25) and the second reaction tower (2) are tightly fitted and rotatably connected, and the two discharge troughs (26) are not connected to each other.

7. A desulfurization and denitrification treatment system according to claim 2, characterized in that: The plug-in block (27) is of arc-shaped design, one end of the catalyst storage barrel (28) located outside the first reaction tower (1) is in contact with the outer surface of the first reaction tower (1), the limiting rod (29) is of arc-shaped rod design, and the limiting rod (29) and the plug-in block (27) are tightly fitted and snap-fitted.

8. A treatment process for a desulfurization and denitrification treatment system according to any one of claims 1 to 7, characterized in that: The steps include: S1. During the treatment process, the flue gas is firstly injected into the interior of the second reaction tower (2) through the first injection pipe (3) at the upper end of the second reaction tower (2). After the flue gas reacts, it is injected into the first injection pipe (3) at the upper end of the first reaction tower (1) through the exhaust pipe (5), the exhaust ring (6) and the connecting pipe (7). After the flue gas reacts inside the first reaction tower (1), it is discharged to the outside through the outlet pipe (8). The lime slurry and the reducing agent are combined with the catalyst to perform continuous desulfurization and denitrification treatment. S2. The solid by-products generated by the reaction are scraped off by the scraper (19), and the switching motor (24) drives the discharge ball (25) to rotate so that the two discharge troughs (26) are interchanged to realize the dumping of the by-products; S3. The ammonium sulfate and ammonium sulfite generated by ammonia escape in the denitration reaction of the first reaction tower (1) are collected by pre-adding a sodium hydroxide solution into the first reaction tower (1), and then the ammonium sulfate and ammonium sulfite are added to the lime slurry in the desulfurization reaction, so as to utilize the denitration by-products by reacting ammonium salt with sulfur dioxide.

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