Flow field optimization equipment of thermal power boiler denitration system

Abstract

The invention provides flow field optimization equipment of an electric boiler denitration system, which comprises a denitration main body, an ammonia spraying mechanism, a smoke inlet cylinder and a smoke exhaust cylinder, a cavity is arranged in the denitration main body, a catalyst is arranged in the cavity, the ammonia spraying mechanism is arranged on the denitration main body and communicated with the denitration main body, the ammonia spraying mechanism is used for spraying ammonia gas, and the smoke inlet cylinder is communicated with the smoke exhaust cylinder. One end of the smoke inlet cylinder is communicated with a boiler smoke exhaust pipe, the other end of the smoke inlet cylinder is communicated with the ammonia spraying mechanism, and a flow guide mechanism for uniformizing smoke is arranged in the smoke inlet cylinder; according to the flow field optimization equipment of the thermal power boiler denitration system, the uniformity of flow field distribution can be improved, and therefore the denitration efficiency is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of flue gas denitrification, and particularly relates to a flow field optimization device for a denitrification system of a thermal power boiler. Background Art

[0002] During the actual operation of thermal power plants, a large amount of flue gas is generated during boiler combustion. Nitrogen oxides in the flue gas are one of the air pollutants and will pollute the environment. In order to reduce emissions, thermal power plants usually use denitrification devices to inject ammonia into the flue gas, so that ammonia is fully mixed with the flue gas. Ammonia and nitrogen oxides in the flue gas undergo a selective catalytic reduction reaction under the action of a catalyst. The flue gas after the reaction continues to be discharged into the atmosphere through the flue gas system, thereby reducing the emission of nitrogen oxides.

[0003] Currently, when the flue gas passes through the turning point of the flue, due to the action of centrifugal force and inertia, obvious local eddy currents and cross-sectional secondary flow phenomena will occur, which may lead to uneven distribution of the flow field and thus affect the denitrification efficiency.

[0004] Therefore, how to overcome the above technical defects is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a flow field optimization device for a denitrification system of a thermal power boiler, which can improve the uniformity of the flow field distribution and thus effectively improve the denitrification efficiency.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A flow field optimization device for a denitrification system of a thermal power boiler, comprising:

[0008] A denitrification main body, which is provided with a cavity inside, and a catalyst is arranged in the cavity;

[0009] An ammonia injection mechanism, which is arranged on the denitrification main body and is communicated with the denitrification main body, and the ammonia injection mechanism is used for injecting ammonia;

[0010] An inlet flue gas pipe, one end of which is communicated with the boiler flue gas discharge pipe, and the other end is communicated with the ammonia injection mechanism. A flow guiding mechanism for uniforming the flue gas is arranged in the inlet flue gas pipe;

[0011] An outlet flue gas pipe, which is used for discharging the denitrified flue gas.

[0012] Optionally, it further includes a bracket, and the bracket can support the denitrification main body;

[0013] The ammonia injection mechanism is arranged on the upper part of the denitrification main body, and the outlet flue gas pipe is arranged on the lower part of the denitrification main body.

[0014] Optionally, the flow guiding mechanism includes:

[0015] Arc-shaped ring, disposed on the inner sidewall of the smoke inlet chimney;

[0016] Fixed rod, fixed on the arc-shaped ring;

[0017] Deflector, rotatably disposed on the fixed rod;

[0018] Adjusting assembly, connected to the deflector for adjusting the rotation angle of the deflector.

[0019] Optionally, the adjusting assembly includes a driving member, a first toothed ring, a second toothed ring and a rotating rod;

[0020] The first toothed ring is connected to the output end of the driving member, the second toothed ring is sleeved on the smoke inlet chimney, and the second toothed ring meshes with the first toothed ring. An arc-shaped groove is formed on the end face of the second toothed ring. One end of the rotating rod is connected to the deflector, and the other end is inserted into the arc-shaped groove. The rotating rod can adjust the angle of the deflector during the rotation of the second toothed ring.

[0021] Optionally, the deflector, the fixed rod, the arc-shaped groove and the rotating rod are all multiple and have the same quantity;

[0022] The arc-shaped grooves are evenly distributed on the end face of the second toothed ring. One deflector is respectively arranged on each fixed rod. One end of each rotating rod is connected to one of the deflectors, and the other end is inserted into one of the arc-shaped grooves.

[0023] Optionally, the rotating rod includes a first rotating rod and a second rotating rod. The first rotating rod is vertically arranged on the second rotating rod. The first rotating rod passes through the denitration main body and is inserted into the arc-shaped groove, and the second rotating rod is inserted into the arc-shaped groove.

[0024] Optionally, the ammonia injection mechanism includes an ammonia storage bottle, a connecting cylinder and an ammonia injection assembly;

[0025] The ammonia storage bottle is used for storing ammonia;

[0026] The connecting cylinder is disposed on the denitration main body and is connected to the denitration main body in communication;

[0027] One end of the ammonia storage bottle is fixed in the connecting cylinder, and the other end extends out of the connecting cylinder;

[0028] The ammonia injection assembly is disposed in the connecting cylinder and is connected to the ammonia storage bottle in communication.

[0029] Optionally, the ammonia spray assembly includes a connecting pipe, a first annular pipe, and a second annular pipe, wherein the second annular pipe is sleeved in the first annular pipe, one end of the connecting pipe is respectively connected to the first annular pipe and the second annular pipe, and the other end is connected to the ammonia storage bottle;

[0030] The first annular tube is provided with a plurality of first nozzles, each of which is provided with a plurality of first spray holes. The second annular tube is provided with a plurality of second nozzles, each of which is provided with a plurality of second spray holes.

[0031] Optionally, the diameter of the first nozzle hole is greater than the diameter of the second nozzle hole.

[0032] Optionally, it further includes a rotating mechanism, wherein the rotating mechanism includes a rotating ring, a central shaft and a rotating assembly;

[0033] The rotating ring is rotatably mounted on the denitrification body;

[0034] The central axis is arranged at the center of the denitration body and is placed on the top of the catalyst;

[0035] There are multiple rotating components, and they can rotate along with the rotating ring.

[0036] Optionally, the rotating assembly includes a rotating plate, a connecting rod, a shift plate and a fixing pin, and a bearing is provided on the central shaft;

[0037] A through hole is provided on the shift plate, the fixing pin is fixed on the rotating ring and passes through the through hole, one end of the connecting rod is fixedly connected to the shift plate, and the other end passes through the rotating ring and is connected to the bearing of the central axis. The rotating plate is arranged on the connecting rod and placed inside the denitrification body.

[0038] Optionally, the rotating mechanism further includes a handle, and the handle is arranged on the outer side wall of the rotating ring.

[0039] It can be seen from the above technical solution that the flue gas enters the chimney, the ammonia spraying mechanism, the denitrification body and the chimney in sequence from the boiler exhaust pipe. Among them, when the flue gas enters the chimney, the guide mechanism arranged at the chimney can evenly distribute the flue gas. When the flue gas reaches the ammonia spraying mechanism, the ammonia sprayed by the ammonia spraying mechanism is mixed with the flue gas. The mixed flue gas enters the denitrification body and undergoes selective catalytic reduction reaction with the catalyst. The flue gas after the reaction is discharged from the chimney.

[0040] Compared with the prior art, the flow field optimization device for the thermal power boiler denitration system disclosed in the embodiment of the present invention can improve the uniformity of the flow field distribution, thereby effectively improving the denitration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0042] Figure 1 It is a schematic diagram of the overall structure of the flow field optimization device for the thermal power boiler denitration system disclosed in the embodiments of the present invention;

[0043] Figure 2 It is a cross-sectional view of the flow field optimization device for the thermal power boiler denitration system disclosed in the embodiments of the present invention;

[0044] Figure 3 is Figure 2 The enlarged schematic diagram of part A in;

[0045] Figure 4 It is a top view of the diversion mechanism disclosed in the embodiments of the present invention;

[0046] Figure 5 is Figure 2 The enlarged schematic diagram of part B in;

[0047] Figure 6 It is a schematic diagram of the rotation mechanism disclosed in the embodiments of the present invention;

[0048] Figure 7 It is a schematic diagram of the rotation mechanism disclosed in the embodiments of the present invention;

[0049] Figure 8 is Figure 7 The enlarged schematic diagram of part C in.

[0050] Explanation of reference numerals:

[0051] 100, denitration main body; 101, catalyst; 200, ammonia injection mechanism; 201, ammonia storage bottle; 202, connecting cylinder; 203, connecting pipe; 204, first annular pipe; 2041, first nozzle; 205, second annular pipe; 2051, second nozzle; 300, flue gas inlet chimney; 400, exhaust chimney; 500, support; 600, diversion mechanism; 601, arc ring; 602, fixed rod; 603, diversion plate; 604, driving member; 605, first gear ring; 606, second gear ring; 6061, arc groove; 607, first rotating rod; 608, second rotating rod; 700, rotation mechanism; 701, rotating ring; 702, central axis; 703, rotating plate; 704, connecting rod; 705, fixing pin; 706, dialing plate; 7061, through hole; 707, handle. Detailed implementation manners

[0052] In view of this, the object of the present invention is to provide a flow field optimization device for a thermal power boiler denitration system, which can improve the uniformity of the flow field distribution, thereby effectively improving the denitration efficiency.

[0053] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Please refer to Figures 1 to 8 。

[0054] Please refer to Figure 1 and Figure 2 As shown in

[0055] and

[0056] The flow field optimization device for a thermal power boiler denitration system disclosed in the embodiments of the present invention includes a denitration main body 100, an ammonia injection mechanism 200, a smoke inlet chimney 300, and a smoke exhaust chimney 400. Among them, a cavity is provided inside the denitration main body 100, and a catalyst 101 is provided in the cavity. The ammonia injection mechanism 200 is provided on the denitration main body 100 and is connected to the denitration main body 100. The ammonia injection mechanism 200 is used for injecting ammonia gas. One end of the smoke inlet chimney 300 is connected to the boiler smoke exhaust pipe, and the other end is connected to the ammonia injection mechanism 200. A flow guiding mechanism 600 for evenly distributing the flue gas is provided inside the smoke inlet chimney 300; the smoke exhaust chimney 400 is used for discharging the denitrated flue gas.

[0057] As a further embodiment, the flow field optimization device for a thermal power boiler denitration system disclosed in the embodiments of the present invention further includes a bracket 500. The bracket 500 can support the denitration main body 100. Among them, the ammonia injection mechanism 200 is provided on the upper part of the denitration main body 100, and the smoke exhaust chimney 400 is provided on the lower part of the denitration main body 100. With such a setting, the smoke exhaust chimney 400 is at a certain distance from the ground, which is convenient for flue gas discharge.

[0058] The embodiments of the present invention do not limit the specific structure of the flow guiding mechanism 600, and any structure that meets the usage requirements of the present invention is within the protection scope of the present invention.

[0059] As one of the embodiments, please refer to Figure 3 and Figure 4 The flow guiding mechanism 600 disclosed in the embodiments of the present invention includes an arc-shaped ring 601, a fixing rod 602, a flow guiding plate 603, and an adjusting assembly. Among them, the arc-shaped ring 601 is arranged on the inner side wall of the smoke inlet cylinder 300, the fixing rod 602 is fixed on the arc-shaped ring 601, the flow guiding plate 603 is rotatably arranged on the fixing rod 602, and the adjusting assembly is connected to the flow guiding plate 603 for adjusting the rotation angle of the flow guiding plate 603.

[0060] Among them, the adjusting assembly includes a driving member 604, a first gear ring 605, a second gear ring 606, and a rotating rod. Specifically, the first gear ring 605 is connected to the driving member 604, the second gear ring 606 is sleeved on the smoke inlet cylinder 300, and the second gear ring 606 meshes with the first gear ring 605. An arc-shaped groove 6061 is formed on the end surface of the second gear ring 606. One end of the rotating rod is connected to the flow guiding plate 603, and the other end is inserted into the arc-shaped groove 6061. The rotating rod can adjust the angle of the flow guiding plate 603 during the rotation of the second gear ring 606.

[0061] Start the driving member 604. The output end of the driving member 604 drives the first gear ring 605 to rotate. The first gear ring 605 drives the second gear ring 606 to rotate circumferentially around the smoke inlet cylinder 300. Since one end of the rotating rod is connected to the flow guiding plate 603 and the other end is inserted into the arc-shaped groove 6061, during the rotation of the second gear ring 606, the rotating rod moves from one end to the other end in the arc-shaped groove 6061, causing the rotating rod to open and tighten, thereby driving the flow guiding plate 603 to rotate on the fixing rod 602 and realizing the angle adjustment of the flow guiding plate 603.

[0062] With such a setting, the optimal configuration of the flow guiding plate 603 is determined through CFD (Computational Fluid Dynamics) simulation, and then adjusted to achieve a uniform distribution of the smoke flow velocity and improve the flow field distribution.

[0063] As a preferred embodiment, the flow guiding plate 603 disclosed in the embodiments of the present invention is preferably arranged at the corner of the smoke inlet cylinder 300.

[0064] Among them, there are multiple flow guiding plates 603, fixing rods 602, arc-shaped grooves 6061, and rotating rods, and the numbers are the same.

[0065] Specifically, the arc-shaped grooves 6061 are evenly distributed on the end surface of the second gear ring 606. One flow guiding plate 603 is respectively arranged on each fixing rod 602. One end of each rotating rod is connected to one of the flow guiding plates 603, and the other end is inserted into one of the arc-shaped grooves 6061.

[0066] It should be noted that each rotating rod corresponds to a deflector 603 and an arc-shaped groove 6061 respectively.

[0067] The specific number of the deflector 603, the fixed rod 602, the arc-shaped groove 6061 and the rotating rod in the embodiments of the present invention is not limited, and those skilled in the art can select according to the actual situation.

[0068] As one of the embodiments, the number of the deflector 603, the fixed rod 602, the arc-shaped groove 6061 and the rotating rod disclosed in the embodiments of the present invention is 4 - 8. With such a setting, uniform diversion of the flue gas can be realized.

[0069] The driving member 604 disclosed in the embodiments of the present invention can be a driving motor, a driving cylinder, or other structures, as long as it can drive the first toothed ring 605 to rotate.

[0070] The specific structure of the rotating rod in the embodiments of the present invention is not limited, as long as it can realize the angle adjustment of the deflector 603.

[0071] As one of the embodiments, the rotating rod disclosed in the embodiments of the present invention has an L-shaped structure, and specifically includes a first rotating rod 607 and a second rotating rod 608. Among them, the first rotating rod 607 is vertically arranged on the second rotating rod 608. The first rotating rod 607 passes through the denitration main body 100 and is inserted into the arc-shaped groove 6061, and the second rotating rod 608 is inserted into the arc-shaped groove 6061.

[0072] When the driving member 604 is started, the driving member 604 drives the first toothed ring 605 to rotate, the first toothed ring 605 drives the second toothed ring 606 to rotate. During the rotation of the second toothed ring 606, the second rotating rod 608 moves from one end to the other end in the arc-shaped groove 6061, so that the first rotating rod 607 drives the deflector 603 to rotate on the fixed rod 602, thereby realizing the angle adjustment of the deflector 603.

[0073] The specific structure of the ammonia injection mechanism 200 in the embodiments of the present invention is not limited, and any structure that meets the use requirements of the present invention is within the protection scope of the present invention.

[0074] As one of the embodiments, please refer to Figure 5 and Figure 6 , the ammonia injection mechanism 200 disclosed in the embodiments of the present invention includes an ammonia storage bottle 201, a connecting cylinder 202 and an ammonia injection assembly.

[0075] Among them, the ammonia storage bottle 201 is used to store ammonia. The connecting cylinder 202 is arranged on the denitration main body 100 and is communicated with the denitration main body 100. One end of the ammonia storage bottle 201 is fixed inside the connecting cylinder 202, and the other end extends outside the connecting cylinder 202. The ammonia injection assembly is arranged inside the connecting cylinder 202 and is communicated with the ammonia storage bottle 201.

[0076] As a further embodiment, the ammonia injection assembly disclosed in the embodiment of the present invention includes a connecting pipe 203, a first annular pipe 204 and a second annular pipe 205. Among them, the second annular pipe 205 is sleeved inside the first annular pipe 204. One end of the connecting pipe 203 is communicated with the first annular pipe 204 and the second annular pipe 205 respectively, and the other end is communicated with the ammonia storage bottle 201.

[0077] Among them, a plurality of first nozzles 2041 are arranged on the first annular pipe 204, and a plurality of first spray holes are arranged on the first nozzles 2041. A plurality of second nozzles are arranged on the second annular pipe 205, and a plurality of second spray holes are arranged on the second nozzles 2051.

[0078] When the flue gas generated by the combustion of the thermal power plant boiler enters the connecting cylinder 202 through the inlet chimney 300, at this time, the ammonia in the ammonia storage bottle 201 can be controlled to be transported to the first annular pipe 204 and the second annular pipe 205 through the connecting pipe 203, and is respectively sprayed out through the first nozzles 2041 and the second nozzles 2051, so that the ammonia is mixed with the flue gas.

[0079] As a further embodiment, the diameter of the spray holes on the first annular pipe 204 disclosed in the embodiment of the present invention is larger than the diameter of the spray holes on the second annular pipe 205.

[0080] Among them, the diameter of the first spray holes is larger than the diameter of the second spray holes. With such a setting, the first spray holes can increase the dosage of the ammonia sprayed out, and the second spray holes can enhance the penetration power of the ammonia jet, increasing the ammonia concentration in the flue duct, thereby further improving the uniformity of the mixing of the flue gas and ammonia.

[0081] The embodiment of the present invention does not limit the specific structure of the rotating mechanism 700, and any structure that meets the use requirements of the present invention is within the protection scope of the present invention.

[0082] As one of the embodiments, please refer to Figure 7 and Figure 8 , the flow field optimization device of the thermal power boiler denitration system disclosed in the embodiment of the present invention further includes a rotating mechanism 700. The rotating mechanism 700 includes a rotating ring 701, a central shaft 702 and a rotating assembly.

[0083] Among them, the swivel ring 701 is rotatably sleeved on the denitration main body 100, the central axis 702 is arranged at the center of the denitration main body 100 and is located above the catalyst 101. There are multiple rotating components, and they can rotate with the swivel ring 701.

[0084] Among them, the rotating components include a rotating plate 703, a connecting rod 704, a dial plate 706 and a fixing pin 705. A bearing is arranged on the central axis 702.

[0085] Specifically, a through hole 7061 is provided on the dial plate 706. The fixing pin 705 is fixed on the swivel ring 701 and passes through the through hole 7061. One end of the connecting rod 704 is fixedly connected to the dial plate 706, and the other end passes through the swivel ring 701 and is connected to the bearing of the central axis 702. The rotating plate 703 is arranged on the connecting rod 704 and is located inside the denitration main body 100.

[0086] To facilitate the pushing of the swivel ring 701, the rotating mechanism 700 disclosed in the embodiment of the present invention further includes a handle 707. Among them, the handle 707 is arranged on the outer side wall of the swivel ring 701.

[0087] After the flue gas is fused with ammonia, push the handle 707. The handle 707 drives the swivel ring 701 to rotate on the denitration main body 100. The fixing pin 705 fixedly connected to the swivel ring 701 rotates. The fixing pin 705 drives the dial plate 706 to rotate. The dial plate 706 drives the connecting rod 704 to rotate around the central axis 702, so that the multiple rotating plates 703 realize angle adjustment inside the denitration main body 100, enabling the flue gas to be evenly distributed on the catalyst 101, ensuring that each catalyst 101 can participate in the reaction, improving the overall denitration efficiency, reducing ammonia escape, reducing the local load of the catalyst 101, and extending its service life.

[0088] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0089] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0090] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flow field optimization device for a thermal power boiler denitration system, characterized in that It includes: A denitration main body with a cavity inside, and a catalyst is arranged in the cavity; An ammonia injection mechanism is arranged on the denitration main body and is communicated with the denitration main body. The ammonia injection mechanism is used for injecting ammonia; An inlet chimney, one end of which is communicated with the boiler exhaust pipe, and the other end is communicated with the ammonia injection mechanism. A flow guiding mechanism for evenly distributing the flue gas is arranged in the inlet chimney; An exhaust chimney for discharging the denitrated flue gas.

2. The flow field optimization device of the thermal power boiler denitration system according to claim 1, characterized in that It further includes a bracket which can support the denitration main body; The ammonia injection mechanism is arranged on the upper part of the denitration main body, and the exhaust chimney is arranged on the lower part of the denitration main body.

3. The flow field optimization device of the thermal power boiler denitration system according to claim 1, characterized in that, The flow guiding mechanism includes: An arc-shaped ring arranged on the inner side wall of the inlet chimney; A fixing rod fixed on the arc-shaped ring; A flow guiding plate rotatably arranged on the fixing rod; An adjusting component connected to the flow guiding plate for adjusting the rotation angle of the flow guiding plate.

4. The flow field optimization device of the thermal power boiler denitration system according to claim 3, characterized in that, The adjusting component includes a driving part, a first toothed ring, a second toothed ring and a rotating rod; The first toothed ring is connected to the output end of the driving part. The second toothed ring is sleeved on the inlet chimney, and the second toothed ring meshes with the first toothed ring. An arc-shaped groove is formed on the end face of the second toothed ring. One end of the rotating rod is connected to the flow guiding plate, and the other end is inserted into the arc-shaped groove. The rotating rod can adjust the angle of the flow guiding plate during the rotation of the second toothed ring.

5. The flow field optimization device for the thermal power boiler denitration system according to claim 4, characterized in that, The flow guiding plates, the fixing rods, the arc-shaped grooves and the rotating rods are all multiple and have the same quantity; The arc-shaped grooves are evenly distributed on the end face of the second toothed ring. One flow guiding plate is respectively arranged on each fixing rod. One end of each rotating rod is connected to one of the flow guiding plates, and the other end is inserted into one of the arc-shaped grooves.

6. The flow field optimization device of the thermal power boiler denitration system according to claim 5, characterized in that The rotating rod includes a first rotating rod and a second rotating rod. The first rotating rod is vertically arranged on the second rotating rod. The first rotating rod passes through the denitration main body and is inserted into the arc-shaped groove, and the second rotating rod is inserted into the arc-shaped groove.

7. The flow field optimization device of the thermal power boiler denitration system according to claim 1, characterized in that, The ammonia injection mechanism includes an ammonia storage bottle, a connecting cylinder and an ammonia injection component; The ammonia storage bottle is used for storing ammonia; The connecting cylinder is arranged on the denitration main body and is communicated with the denitration main body; One end of the ammonia storage bottle is fixed in the connecting cylinder, and the other end extends out of the connecting cylinder; The ammonia injection component is arranged in the connecting cylinder and is communicated with the ammonia storage bottle.

8. The flow field optimization device of the thermal power boiler denitration system according to claim 7, characterized in that, The ammonia injection component includes a connecting pipe, a first annular pipe and a second annular pipe. The second annular pipe is sleeved inside the first annular pipe. One end of the connecting pipe is respectively communicated with the first annular pipe and the second annular pipe, and the other end is communicated with the ammonia storage bottle; A plurality of first nozzles are arranged on the first annular pipe, and a plurality of first spray holes are arranged on the first nozzles. A plurality of second nozzles are arranged on the second annular pipe, and a plurality of second spray holes are arranged on the second nozzles.

9. The flow field optimization device for the thermal power boiler denitration system according to claim 8, characterized in that, The diameter of the first spray holes is larger than the diameter of the second spray holes.

10. The flow field optimization device of the thermal power boiler denitration system according to claim 1, characterized in that, It further includes a rotating mechanism which includes a rotating ring, a central shaft and a rotating component; The rotating ring is rotatably sleeved on the denitration main body; The central shaft is arranged at the center of the denitration main body and is located above the catalyst; The rotating components are multiple and can rotate with the rotating ring.

11. The flow field optimization device of the thermal power boiler denitration system according to claim 10, characterized in that, The rotating components include a rotating plate, a connecting rod, a dial plate and a fixing pin, and a bearing is arranged on the central shaft; A through hole is formed in the dial plate. The fixing pin is fixed on the rotating ring and passes through the through hole. One end of the connecting rod is fixedly connected with the dial plate, and the other end passes through the rotating ring and is connected with the bearing of the central shaft. The rotating plate is arranged on the connecting rod and is placed inside the denitration main body.

12. The flow field optimization device for the thermal power boiler denitration system according to claim 11, characterized in that, The rotating mechanism further includes a handle, and the handle is arranged on the outer side wall of the rotating ring.

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