Flue gas ammonia desulfurization system

Abstract

The invention provides a flue gas ammonia process desulfurization system which comprises a flue, and in the direction from upstream to downstream, the flue comprises a first section extending from bottom to top; the second section obliquely extends from top to bottom and is communicated with the first section, the downstream end of the second section is used for being fixed to the desulfurizing tower in a communicated mode, the flue is arranged in an inclined mode, the upstream end of the flue is high, and the downstream end of the flue is low, so that backflow of substances such as flue gas in the desulfurizing tower can be effectively reduced or prevented; even if a small part of substances flow back into the second section, the substances are difficult to flow back to the first section. Particularly, under the condition of backflow of the substances, the obliquely arranged second section cannot gather the substances, and the substances can flow back into the desulfurizing tower again, so that corrosion in the flue and corrosion at the joint of the flue and the desulfurizing tower are effectively avoided, and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of ammonia desulfurization, and in particular relates to a flue gas ammonia desulfurization system. Background Art

[0002] At present, ammonia desulfurization technology is widely used in power station boiler flue gas treatment. The boiler flue gas desulfurization adopts ammonia-sulfuric acid ammonia desulfurization system, and the flue gas meets the emission requirements after purification.

[0003] Ammonia flue gas desulfurization technology is a chemical reaction process based on the chemical reaction between alkaline liquid ammonia and acidic substances SO2 and SO3. The characteristics of ammonia flue gas desulfurization are no secondary waste residue, wastewater and waste gas pollution, and SO2 is recovered to produce ammonium sulfate, realizing SO2 recovery and maximizing value.

[0004] After the coal is burned in the boiler, the flue gas generated enters the desulfurization tower through the flue from the middle and lower part of the desulfurization tower. The flue gas enters the desulfurization tower and moves upward. First, it contacts the slurry sprayed by the secondary circulating pump in the desulfurization tower through the nozzle in countercurrent to wash, cool and absorb. In this process, the circulating liquid containing liquid ammonia absorbs SO2 in the flue gas and reacts to form ammonium sulfite; part of the flue gas flows back to the bottom of the desulfurization tower after the reaction, and the other part of the flue gas continues to move upward. In the absorption section, the flue gas continues to react with the circulating liquid containing liquid ammonia discharged by the secondary pump. The dilute solution containing ammonium sulfate flows to the oxidation tank and reacts with the oxidizing air blown in from the bottom to oxidize the ammonium sulfite into ammonium sulfate to form a dilute ammonium sulfate solution; part of the solution in the oxidation tank is sent to the desulfurization tower through the primary circulating pump, and the other part can be discharged to the concentration section of the absorption tower by the demister of the concentration section according to the liquid level of the desulfurization tower. The slurry in the concentration section passes through the secondary circulating pump, contacts with the hot flue gas for multiple cycles, and is continuously concentrated. Finally, it is partially crystallized to obtain an ammonium sulfate slurry with a certain solid content.

[0005] In ammonia desulfurization technology, there are problems including system corrosion. Solving the system corrosion problem can extend the service life of the desulfurization tower, oxidation tank, and flue, and achieve long-term stable operation of the flue gas ammonia desulfurization system.

[0006] For example, a leak appears on the wall of the desulfurization tower, causing a large amount of slurry to leak out of the desulfurization tower from the leak when the boiler is running, seriously affecting civilized production. Long-term corrosion will weaken the strength of the wall of the desulfurization tower and may cause the desulfurization tower to collapse.

[0007] For example, leakage may occur during the operation of the oxidation tank, affecting civilized production. Long-term corrosion will weaken the wall strength of the oxidation tank and may cause the oxidation tank to collapse.

[0008] Therefore, it is necessary to design a flue gas ammonia desulfurization system to improve the anti-corrosion ability and ensure normal operation. Summary of the invention

[0009] In view of some or all of the above technical problems existing in the prior art, the present invention proposes a flue gas ammonia desulfurization system, which can effectively improve the corrosion resistance of the ammonia desulfurization system and increase its service life.

[0010] According to the present invention, a flue gas ammonia desulfurization system is provided, comprising a flue, wherein in the upstream to downstream direction, the flue contains:

[0011] The first section extending from bottom to top,

[0012] The second section extends obliquely from top to bottom and is connected to the first section, and the downstream end of the second section is connected and fixed to the desulfurization tower.

[0013] In one embodiment, a flue liner is sleeved in the inner cavity of the second section. In the direction from upstream to downstream, the flue liner has a tapered cylinder and a divergent cylinder communicatively connected to the tapered cylinder. The upstream end of the tapered cylinder is fixed to the inner cavity of the second section, and the downstream end of the divergent cylinder protrudes into the inner cavity of the desulfurization tower.

[0014] In one embodiment, the upper and lower parts of the downstream end of the gradually expanding barrel both protrude into the inner cavity of the desulfurization tower, and the middle part of the downstream end of the gradually expanding barrel is smaller in size than the upper and lower parts in the upstream and downstream directions of the gradually expanding barrel.

[0015] In one embodiment, a baffle extending downward is provided on the lower portion of the downstream end of the diverging cylinder.

[0016] In one embodiment, the outer wall of the gradually diverging cylinder and the inner wall of the second section are in rolling connection.

[0017] In one embodiment, in the inner cavity of the desulfurization tower, the nozzle opening direction of the nozzle close to the inner wall of the desulfurization tower is away from or parallel to the inner wall of the desulfurization tower adjacent to the nozzle.

[0018] In one embodiment, a desulfurization tower liner is sleeved in the inner cavity of the desulfurization tower, the upper edge of the desulfurization tower liner does not protrude from the connecting hole of the desulfurization tower for connecting with the flue, and glass flakes are covered on the inner wall of the other desulfurization towers that are not provided with the desulfurization tower liner.

[0019] In one embodiment, a liquid conducting groove with an upward opening is provided on the outer wall of the desulfurization tower, the liquid conducting groove is inclined in the circumferential direction, and a liquid drain port is provided at the lowest point of the liquid conducting groove, and the liquid drain port is used to communicate with a pit.

[0020] In one embodiment, an oxidation trough is further included, and an oxidation trough lining is fixed in a sleeve-type manner on the inner wall of the oxidation trough. The oxidation trough lining is located on the outer side of an air distribution plate in the oxidation trough. A support ring is arranged at the lower edge of the oxidation trough lining, and the support ring is used to set the air distribution plate.

[0021] In one embodiment, an ammonia adding chamber is constructed in the oxidation tank, a reflux pipe is connected between the desulfurization tower and the ammonia adding chamber, and a shielding cover is provided in the ammonia adding chamber for being mounted on a reflux pipe nozzle connected to the reflux pipe.

[0022] Compared with the prior art, the advantages of the present invention are: the flue includes a first section extending up and down and a second section inclined with a high upstream end and a low downstream end, which can effectively reduce or prevent the backflow of substances such as flue gas in the desulfurization tower. Even if a small amount of substances flows back into the second section, it is difficult to flow back to the first section. In particular, in the case of backflow of substances, the second section arranged in an inclined manner cannot cause the substances to gather in the flue, and will flow back into the desulfurization tower again, thereby effectively avoiding corrosion in the flue and at the connection between the flue and the desulfurization tower, and improving the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0024] Figure 1 A flue gas ammonia desulfurization system according to one embodiment of the present invention is shown;

[0025] Figure 2 The figure shows a nozzle close to the inner wall of a desulfurization tower in a flue gas ammonia desulfurization system according to an embodiment of the present invention;

[0026] Figure 3 For Figure 1 AA cross-section diagram.

[0027] In the drawings, the same reference numerals are used for the same components, but the drawings are not drawn to scale. DETAILED DESCRIPTION

[0028] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0029] The embodiment of the present invention provides a flue gas ammonia desulfurization system. Figure 1As shown, the flue gas ammonia desulfurization system includes a flue 1. In the upstream to downstream direction, the flue 1 contains a first section 11 and a second section 12 that are connected in sequence. Among them, the first section 11 is generally constructed to extend vertically, and the downstream end is higher than the upstream end. The second section 12 extends obliquely, and the downstream end is lower than the upstream end. The upstream end of the second section 12 is connected to the first section 11 in a communicating manner. The downstream end of the second section 12 is used to be fixed to the desulfurization tower 3, and the downstream end of the second section 12 is connected to the middle and lower part of the desulfurization tower 3 in the height direction.

[0030] During use, the flue gas is sent to the desulfurization tower 3 through the flue 1 for desulfurization and purification. By setting the flue 1 as the above structure, the backflow of substances such as flue gas in the desulfurization tower 3 can be effectively reduced or prevented. Even if a small amount of substances flows back into the second section 12, it is difficult to flow back to the first section 11. In particular, in the case of backflow of substances, the second section 12 set obliquely cannot cause the substances to gather, and they will flow back into the desulfurization tower 3 again, thereby avoiding corrosion of the flue 1 and the connection between the flue 1 and the desulfurization tower 3, and improving the service life.

[0031] The flue lining 2 is sleeved in the inner cavity of the second section 12 to protect the flue 1. For example, the flue lining 2 can be made of 2507 duplex stainless steel. And the flue 1 can be made of 316L stainless steel. In the direction from upstream to downstream, the flue lining 2 has a tapered cylinder 21 and a divergent cylinder 22. The divergent cylinder 22 is connected to the tapered cylinder 21 in a communicating manner and is located downstream of the tapered cylinder 21. During the flue gas transportation process, when passing through the minimum flow area, the flow velocity increases, and the central jet of the flue gas has a suction effect on the flue gas near the pipe wall of the flue lining 2, while preventing the moisture in the desulfurization tower 3 from diffusing into the flue lining 2. The upstream end of the tapered cylinder 21 is fixed to the inner cavity of the second section 12. For example, the upstream end of the tapered cylinder 21 is fixed to the second section 12 by full-circle welding, serving as the fixed end of the flue lining 2 and as the expansion and contraction dead point of the flue lining 2. The whole-circle welding method also helps prevent corrosive liquids or flushing water from entering the gap between the flue 1 and the flue lining 2, thereby avoiding corrosion to the bottom of the flue 1. The tapered tube 21 is butt-welded to the gradually expanding tube 22. The downstream end of the gradually expanding tube 22 protrudes into the inner cavity of the desulfurization tower 3.

[0032] Further, in the upstream and downstream directions, the length of the diverging cylinder 22 is 2 to 3 times, for example, 2.5 times, the length of the converging cylinder 21. The taper angle α of the outer wall of the converging cylinder 21 can be 10-20 degrees, for example, 15 degrees. The angle between the extension direction of the second section 12 and the horizontal can be 30-50 degrees, for example, 45 degrees. These structural optimizations can effectively prevent corrosive liquids from flowing back into the flue 1 and the flue fan (the flue fan is a prior art and is not shown in the figure) used to drive the flow of smoke in the flue 1 and causing corrosion to these parts.

[0033] like Figure 3 As shown, the downstream end of the gradually expanding cylinder 22 is not a flush opening. Specifically, the upper portion 221 of the downstream end of the gradually expanding cylinder 22 protrudes into the inner cavity of the desulfurization tower 3 to serve as a rainproof structure. For example, the size of the upper portion 221 of the downstream end of the gradually expanding cylinder 22 extending into the interior of the desulfurization tower 3 can be 45-55 cm, for example, about 50 cm. This arrangement can prevent the slurry inside the desulfurization tower 3 from splashing onto the flue 1, thereby preventing the flue 1 from being corroded. At the same time, it prevents the flue gas from moving upward along the wall of the desulfurization tower 3, ensuring that the flue gas is in full contact with the slurry. The lower portion 222 of the downstream end of the gradually expanding cylinder 22 also protrudes into the inner cavity of the desulfurization tower 3. The size of the lower portion 222 of the downstream end of the gradually expanding cylinder 22 extending into the interior of the desulfurization tower can be 25-35 meters, for example, about 30 cm. In addition, a baffle 23 is provided at the lower portion of the downstream end of the gradually expanding cylinder 22. The baffle 23 can play a limiting role to prevent the flue lining 2 from shrinking into the inner cavity of the flue 1 when the flue 1 is in a cold state. In addition, the downstream end of the gradually expanding cylinder 22 is a free end, and the shrinkage due to thermal expansion and contraction can be reserved. It should be noted here that the present application does not limit the shape of the transverse cross section of the flue 1 and the flue lining 2. For example, the flue 1 can be a cylindrical flue or a flue with a square cross section, or other shapes. At the same time, the cross section of the flue lining 2 can also be circular, square, or other shapes. The middle portion 223 at the downstream end of the gradually expanding cylinder 22 is concave relative to the upper portion 221 and the lower portion 222, and its dimension extending into the desulfurization tower 3 is not large, for example, approximately 5 cm, so as to form a gap at the downstream end of the gradually expanding cylinder 22 to ensure smooth discharge of flue gas. Figure 3 An embodiment of the cross section of the downstream end of the gradually expanding cylinder 22 is given. In the circumferential direction of the gradually expanding cylinder 22, the upper part 221 can extend 90-180 degrees along the circumferential direction, and in the circumferential direction of the gradually expanding cylinder 22, the lower part 222 can extend 60-120 degrees along the circumferential direction.

[0034] The outer wall of the gradually expanding cylinder 22 is connected to the inner wall of the second section 12 in a rolling manner. The flue lining 2 and the outer wall of the flue 1 can move relative to each other without affecting each other's expansion and contraction. This arrangement can reduce friction and wear between the flue 1 and the flue lining 2 during the mutual movement.

[0035] A connecting hole 33 is provided on the desulfurization tower 3. The flue 1 and the desulfurization tower 3 are connected in a connecting manner at the connecting hole 33. At the connecting hole 33, the first plate 36, for example, a 1.4529 steel plate is used to connect the desulfurization tower 3 and the flue 1 to wrap and weld the corner seam. The first plate 36 is overlapped on the inner wall of the desulfurization tower 3 and the inner wall of the flue 1. The first plate 36 can improve the anti-corrosion ability of the connection and increase the structural strength.

[0036] A first support rod 24 extending perpendicularly to the length of the gradually expanding cylinder 22 is arranged in the inner cavity of the gradually expanding cylinder 22. The first support rod 24 can be multiple and arranged crosswise. A second support rod 25 extending perpendicularly to the length of the gradually expanding cylinder 22 is arranged in the inner cavity at the connection between the reducing cylinder 21 and the gradually expanding cylinder 22. The second support rod 25 can also be multiple and arranged crosswise. By arranging the support rods 24 and 25, the overall shape of the flue liner 2 can be effectively ensured to be stable.

[0037] In the inner cavity of the desulfurization tower 3, the nozzle opening direction of the nozzle 31 close to the inner wall of the desulfurization tower 3 is away from or parallel to the inner wall of the desulfurization tower 3 near the nozzle 31. Specifically, Figure 2 As shown, the nozzle 31 near the inner wall of the desulfurization tower 3 is a right-angle nozzle. The fluid sprayed from the nozzle of the right-angle nozzle is directed toward the middle of the desulfurization tower 3 or vertically downward to prevent the slurry from directly flushing the tower wall of the desulfurization tower 3 and causing corrosion to the inner wall of the desulfurization tower 3. Figure 1 In the schematic diagram of FIG. 3 , four right-angle nozzles are shown, and the four nozzles 31 are all adjacent to the inner wall of the desulfurization tower 3. For example, Figure 1 The nozzle 31 at the left end of the nozzle 311 is as shown in FIG. Figure 2 There are three nozzles shown, one facing right, one facing downward, and one facing obliquely to the lower right, to prevent the spray from the nozzle 311 from reaching the inner wall of the desulfurization tower 3 on the left. Figure 1 The arrangement of the nozzle 31 at the right end is just opposite to that of the nozzle 31 at the left end.

[0038] Compared with the prior art, the outer wall of the concentration section of the desulfurization tower 3 is not provided with an insulation layer. This arrangement can promote heat dissipation, facilitate the reaction of sulfur dioxide and liquid ammonia to generate ammonium sulfate, and facilitate timely discovery of the leakage point of the desulfurization tower 3.

[0039] A desulfurization tower lining 32 is sleeved in the inner cavity of the desulfurization tower 3. The upper edge of the desulfurization tower lining 32 does not protrude from the connecting hole 33 where the desulfurization tower 3 is connected to the flue 1. The lower part of the desulfurization tower lining 32 is welded to the bottom wall of the desulfurization tower 3. Glass flakes are used to cover the corners between the bottom wall of the desulfurization tower 3 and the desulfurization tower lining 32 for corrosion protection. The upper part of the desulfurization tower lining 32 is welded to the first plate 36 at the connecting hole 33, and the remaining part is welded to the inner wall of the desulfurization tower 3 through the second plate 37, such as a 1.4529 steel plate. By sleeve-mounting the desulfurization tower lining 32, the anti-corrosion ability of the desulfurization tower 3 at this part can be effectively increased, and the corrosion and leakage of the concentration section of the desulfurization tower 3 can be fully prevented. At the same time, the desulfurization tower lining 32 also has the function of improving strength. In addition, the second plate 37 not only realizes the effective connection between the desulfurization tower lining 32 and the inner wall of the desulfurization tower 3, but also effectively increases the corrosion resistance of the connection and strengthens the corrosion resistance of the weak points. The inner wall of the desulfurization tower 3 that is not provided with the desulfurization tower lining 32 is partially covered with glass flakes to improve the corrosion resistance.

[0040] A liquid conducting groove 34 is provided on the outer wall of the desulfurization tower 3. The opening of the liquid conducting groove 34 faces upward, and is used to receive the liquid leaking from the desulfurization tower 3, so as to avoid corrosion of the non-leaking area by the leaking liquid, and at the same time ensure the cleanliness of the equipment and realize civilized production. The liquid conducting groove 34 is inclined in the circumferential direction of the desulfurization tower 3, and a liquid drain port 35 is provided at the lowest point of the liquid conducting groove 34. The liquid drain port 35 is connected to the pit 7. Specifically, the liquid conducting groove 34 is made of 2507 dual-phase steel. The liquid conducting groove 34 itself is in the shape of a U-shaped groove or a semicircular groove, and opens upward. One groove wall of the groove is welded to the entire circumference of the desulfurization tower 3.

[0041] Preferably, a plurality of liquid guide grooves 34 are provided on the outer wall of the desulfurization tower 3, and these liquid guide grooves 34 are spaced apart in the axial direction of the desulfurization tower 3, for example, adjacent liquid guide grooves 34 are spaced apart by about 1 meter. The drainage ports 35 of each liquid guide groove 34 are connected, so that the accumulated liquid flows from the drainage port 35 of the upper liquid guide groove 34 to the drainage port 35 of the lower liquid guide groove 34 and is finally collected in the pit 7. For example, the drainage port 35 is connected through the connecting groove 38, that is, the accumulated liquid in the upper liquid guide groove 34 is transferred to the lower liquid guide groove 34 through the connecting groove 38. The connecting groove 38 can be constructed as a groove with an opening facing outward, which mainly plays a drainage role, and the bottom wall of the groove is fixed to the outer wall of the desulfurization tower 3 to protect the desulfurization tower 3. The provision of the liquid guide groove 34 can not only increase the strength of the desulfurization tower 3 itself, but also facilitate the collection of the leaked liquid of the desulfurization tower 3, reduce the corrosion of the leaked liquid to the non-leakage area, and at the same time ensure the cleanliness of the system and realize civilized production.

[0042] In the oxidation trough 5, the inner wall of the oxidation trough 5 outside the air distribution plate 51 is thoroughly cleaned and polished to a metallic luster, and the oxidation trough lining 52 is welded. The height of the oxidation trough lining 52 is, for example, 15 cm, and its material can be 2507 dual-phase steel plate. A support ring 53 is provided at the lower edge of the oxidation trough lining 52. Thus, the air distribution plate 51 can be stably fixed on the upper part of the support ring 53. The support ring 53 is welded around the entire circumference of the air distribution plate 51. The strength and corrosion resistance of this part are enhanced by providing the oxidation trough lining 52. The support ring 53 can facilitate the stable layout of the air distribution plate 51.

[0043] In addition, a partition 55 is provided in the upper space of the air distribution plate 51 to partition the upper space of the oxidation tank 5 to form an ammonia-adding chamber 54. A 2507 dual-phase steel plate is welded from top to bottom on the inner wall of the oxidation tank 5 at the partition 55 of the ammonia-adding chamber 54 as an ammonia-adding chamber lining 56. For example, the width of the ammonia-adding chamber lining 56 is 15 cm. This arrangement can strengthen the strength and corrosion resistance of the parts of the oxidation tank 5 that are impacted by the liquid flow and the equipment, and realize the long-term operation of the oxidation tank 5.

[0044] A reflux pipe 60 is connected between the oxidation tank 5 and the desulfurization tower 3. Among them, one reflux pipe 60 is connected to the ammonia addition chamber 54, and a reflux pipe nozzle is provided at the end of the reflux pipe 60 located in the ammonia addition chamber 54. A shielding cover is installed at the reflux pipe nozzle 57 in the ammonia addition chamber 54, and the shielding cover may include a baffle 58. The baffle 58 is welded to the reflux pipe nozzle 57 through a connecting bracket 59. For example, the baffle 58 and the connecting bracket 59 are made of a steel plate with a material of 1.4529. The baffle 58 is a plurality of pieces, for example, four pieces, which are spliced ​​into a square cylindrical shielding cover to cover the reflux pipe nozzle 57. For example, each baffle 58 is 20 cm away from the reflux pipe nozzle 57. The baffle 58 blocks the slurry from directly flushing the inner wall of the oxidation tank 5 without affecting the spraying of the reflux pipe nozzle 57.

[0045] The ends of the two return pipes 60 extend below the liquid level of the oxidation tank 5 to avoid severe impact of the slurry on the air distribution plate 51 and also reduce the vibration of the return pipes 60 .

[0046] A mounting bracket 8 is provided at the lower part of the reflux pipe 60 between the desulfurization tower 3 and the oxidation tank 5 to support the reflux pipe 60, so as to solve the problem of severe vibration of the reflux pipe 60. For example, the mounting bracket 8 is in the shape of a square stool, and a concrete foundation is constructed below the column of the mounting bracket 8. The column of the mounting bracket 8 is fastened to the embedded plate on the surface of the concrete foundation by high-strength bolts. A bracket platform is formed on the column of the mounting bracket 8. The reflux pipe 60 is located on the platform of the mounting bracket 8 and is fixed to the mounting bracket 8 by a clamp.

[0047] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made according to the embodiments of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flue gas ammonia desulfurization system, characterized in that: The invention comprises a flue, wherein in the upstream to downstream direction, the flue contains: The first section extending from bottom to top, The second section extends obliquely from top to bottom and is connected to the first section, and the downstream end of the second section is connected and fixed to the desulfurization tower.

2. The flue gas ammonia desulfurization system according to claim 1, characterized in that: A flue liner is sleeved in the inner cavity of the second section. In the direction from upstream to downstream, the flue liner has a tapered cylinder and a divergent cylinder communicatively connected to the tapered cylinder. The upstream end of the tapered cylinder is fixed to the inner cavity of the second section, and the downstream end of the divergent cylinder protrudes into the inner cavity of the desulfurization tower.

3. The flue gas ammonia desulfurization system according to claim 2, characterized in that: The upper and lower parts of the downstream end of the gradually expanding barrel both protrude into the inner cavity of the desulfurization tower, and the middle part of the downstream end of the gradually expanding barrel is smaller in size than the upper and lower parts in the upstream and downstream directions of the gradually expanding barrel.

4. The flue gas ammonia desulfurization system according to claim 3, characterized in that: A baffle extending downward is provided on the lower portion of the downstream end of the diverging cylinder.

5. The flue gas ammonia desulfurization system according to any one of claims 2 to 4, characterized in that: The outer wall of the gradually expanding cylinder and the inner wall of the second section are in rolling connection.

6. The flue gas ammonia desulfurization system according to any one of claims 1 to 5, characterized in that: In the inner cavity of the desulfurization tower, the nozzle opening direction of the nozzle close to the inner wall of the desulfurization tower is away from or parallel to the inner wall of the desulfurization tower adjacent to the nozzle.

7. The flue gas ammonia desulfurization system according to any one of claims 1 to 6, characterized in that: A desulfurization tower liner is sleeved in the inner cavity of the desulfurization tower, the upper edge of the desulfurization tower liner does not protrude from the connecting hole of the desulfurization tower for connecting with the flue, and glass flakes are covered on the inner wall of the other desulfurization towers not provided with the desulfurization tower liner.

8. The flue gas ammonia desulfurization system according to any one of claims 1 to 7, characterized in that: A liquid conducting groove with an upward opening is arranged on the outer wall of the desulfurization tower. The liquid conducting groove is inclined in the circumferential direction, and a liquid discharge port is arranged at the lowest point of the liquid conducting groove. The liquid discharge port is used to communicate with the pit.

9. The flue gas ammonia desulfurization system according to any one of claims 1 to 8, characterized in that: It also includes an oxidation trough, on the inner wall of which an oxidation trough lining is fixed in a sleeve manner, the oxidation trough lining is located on the outside of an air distribution plate in the oxidation trough, and a support ring is provided at the lower edge of the oxidation trough lining, and the support ring is used to set the air distribution plate.

10. The flue gas ammonia desulfurization system according to claim 9, characterized in that: An ammonia adding chamber is constructed in the oxidation tank, a reflux pipe is connected between the desulfurization tower and the ammonia adding chamber, and a shielding cover is arranged in the ammonia adding chamber for being mounted on a reflux pipe nozzle connected to the reflux pipe.

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