Denitration ammonia injection grid device with self-adaptive flow guide characteristic

Abstract

The invention relates to the technical field of ammonia injection grids, in particular to a denitration ammonia injection grid device with a self-adaptive flow guide characteristic. The device comprises a gas transmission main pipe, a gas transmission branch pipe and a gas outlet pipe, the outlet end of the gas outlet pipe is provided with a plurality of spoilers which are distributed at equal intervals and rotationally arranged, the spoilers are parallel to the outlet end of the gas outlet pipe, and a distance exists between each spoiler and the outlet end of the gas outlet pipe. By arranging the rotatable spoiler, the spoiler can rotate around the rotating shaft under the airflow impact of flue gas and ammonia gas to form an airflow field with a specific flow direction, and the spoiler can generate a directional pushing effect on the surrounding ammonia gas and flue gas, so that two gases which can flow in a layered manner originally are forced to be mutually inserted and interwoven; by means of the structure, ammonia gas sprayed out of the gas outlet pipe can be diffused to a wider range, ammonia gas is prevented from being concentrated in a local area, the contact area and contact time of the ammonia gas and flue gas are greatly increased, the ammonia gas and the flue gas are promoted to be mixed more rapidly and fully, and favorable conditions are created for efficient denitration reaction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ammonia injection grid, in particular to a denitration ammonia injection grid device with self-adaptive flow guiding characteristics. BACKGROUND

[0002] The traditional power generation technology used in thermal power plants produces a large amount of sulfides or nitrides, which has a serious pollution effect on the atmosphere. At present, the thermal power plant carries out denitration, generally adopts an ammonia injection system, reacts harmful substances nitrogen oxides in flue gas with ammonia to generate harmless nitrogen and water for discharge; the denitration process is that a first-stage gas collecting pipe is directly connected with an ammonia injection grid, the ammonia injection grid is arranged in a flue of an inlet of a denitration reactor, ammonia is injected into the flue through the ammonia injection grid and mixed with boiler flue gas, and finally, under the action of a catalyst in the denitration reactor, the nitrogen oxides are reduced and decomposed into harmless nitrogen and water.

[0003] The existing denitration ammonia injection grid device directly injects ammonia gas through an outlet pipe, lacks directional flow guiding and diffusion structure, ammonia gas is prone to form local aggregation near the outlet pipe and cannot be diffused to a wide range; at the same time, flue gas and ammonia gas are prone to stratified flow due to flow rate difference, the contact area of the two is small and the mixing efficiency is low, which leads to insufficient denitration reaction and difficulty in removing nitrogen oxides in local areas, thereby affecting the overall denitration effect. Therefore, the denitration ammonia injection grid device with self-adaptive flow guiding characteristics is proposed to solve the above problems. SUMMARY The purpose of the present application is to provide a denitration ammonia injection grid device with self-adaptive flow guiding characteristics, which is used to solve the problem that the outlet pipe lacks directional flow guiding and diffusion structure, leading to local aggregation of ammonia gas and difficulty in diffusing to a wide range, and flue gas and ammonia gas are prone to stratified flow, the contact area is small, the mixing efficiency is low, which leads to insufficient denitration reaction and difficulty in removing nitrogen oxides in local areas, thereby affecting the overall denitration effect.

[0004] The present application provides a denitration ammonia injection grid device with self-adaptive flow guiding characteristics, comprising a gas conveying main pipe, a plurality of equally distributed gas conveying branch pipes are communicated on both sides of the gas conveying main pipe, and a plurality of equally distributed outlet pipes are communicated on the plurality of gas conveying branch pipes. A plurality of equally distributed spoiler plates rotatingly arranged are arranged at the outlet end of the outlet pipe, the spoiler plates are arranged in parallel with the outlet end of the outlet pipe, and there is a gap between the spoiler plates and the outlet end of the outlet pipe.

[0005] In the technical solution, a mounting frame is further included, a connecting frame is fixedly installed on the mounting frame, a rotating shaft is rotatably connected to the connecting frame through a bearing, a plurality of equally distributed spoiler plates are fixedly installed on the rotating shaft, and a guide seat is fixedly installed at the top end of the rotating shaft.

[0006] The guiding seat is conical in shape.

[0007] In the technical solution, the plurality of spoiler plates are all arranged in an inclined manner.

[0008] In the technical solution, the mounting frame is in the shape of a "U" letter, and the mounting frame is matched with the mounting plate.

[0009] In the technical solution, two first through grooves are formed in the mounting frame, and a second through groove is formed in the mounting plate.

[0010] In the technical solution, bolts are arranged on the mounting frame, the bolts pass through the mounting frame and the mounting plate through the first through grooves and the second through groove, and locking nuts are threadedly connected to the bolts.

[0011] In the technical solution, the gas conveying main pipe is provided with a valve.

[0012] In the technical solution, a flange plate is fixedly arranged at one end of the gas conveying main pipe.

[0013] In the technical solution, a plurality of mounting holes are formed in the flange plate at equal intervals.

[0014] Beneficial effects: By arranging the spoiler plates at the outlet end of the gas outlet, the spoiler plates on the rotating shaft can rotate under the impact of the ammonia gas and the flue gas, forming a gas flow field with a specific flow direction. The inclined spoiler plates can generate directional pushing effect on the surrounding ammonia gas and flue gas, so that the two gases which may flow in layers are forced to interpenetrate and interweave. At the same time, the ammonia gas sprayed from the gas outlet pipe can be diffused to a wider range, avoiding the concentration of ammonia gas in a local area, greatly increasing the contact area and contact time of ammonia gas and flue gas, and promoting the faster and more sufficient mixing of the two, creating favorable conditions for efficient denitration reaction. The rotation speed of the spoiler plates changes with the change of the flue gas flow rate. This self-adaptive adjustment without additional power makes the device flexible to adapt to the change of gas flow under different working conditions, ensuring good mixing effect under various operating conditions. Without additional power driving, the spoiler intensity can be dynamically optimized according to the real-time gas flow state, solving the problem that the traditional fixed spoiler structure is difficult to adapt to complex gas flow changes. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0016] Figure 1 The whole perspective structure schematic diagram of one embodiment of the present application; Figure 2 The whole internal structure schematic diagram of one embodiment of the present application; Figure 3 The partial side view internal structure schematic diagram of one embodiment of the present application; Figure 4 The partial enlarged structure schematic diagram of one embodiment of the present application.

[0017] Figure 5 The internal structure schematic diagram of the mounting frame of one embodiment of the present application.

[0018] Figure 6 The top view structure schematic diagram of multiple spoilers of one embodiment of the present application.

[0019] Explanation of reference signs: 1, gas delivery main pipe; 2, gas delivery branch pipe; 3, gas outlet pipe; 4, spoiler; 5, mounting frame; 6, valve; 7, flange plate; 8, rotating shaft; 9, connecting frame; 10, bolt; 11, locking nut; 12, mounting plate; 13, limiting plate; 14, guide seat; 15, through hole; 16, mounting hole. DETAILED DESCRIPTION

[0020] The technical solutions of the present application will be described clearly and completely below in conjunction with embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0022] Moreover, the terms "first", "second", "third", etc. are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or a quantity of indicated technical features. Thus, features defined with "first", "second" or "third" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited. In addition, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] Please refer to Figures 1-6 As shown, the denitration ammonia injection grid device with adaptive flow guiding characteristics comprises a gas conveying main pipe 1 and a mounting frame 5, a plurality of equidistantly distributed gas conveying branch pipes 2 are communicated with both sides of the gas conveying main pipe 1, a plurality of equidistantly distributed gas outlet pipes 3 are communicated with the gas conveying branch pipes 2, a connecting frame 9 is fixedly installed on the mounting frame 5, a rotating shaft 8 is rotatably connected to the connecting frame 9 through a bearing, a plurality of equidistantly distributed spoiler plates 4 are fixedly installed on the rotating shaft 8, and a guide seat 14 is fixedly installed at the top end of the rotating shaft 8.

[0024] In the technical solution, the bottom end of the rotating shaft 8 is fixedly installed with a limiting plate 13.

[0025] In the technical solution, the guide seat 14 is conical in shape.

[0026] In the technical solution, the plurality of spoiler plates 4 are all arranged in an inclined manner.

[0027] In the technical solution, the mounting frame 5 is "U"-shaped, and the mounting frame 5 is matched with the mounting plate 12, so that the mounting frame 5 can be inserted with the mounting plate 12.

[0028] In the technical solution, two first through grooves 15 are formed in the mounting frame 5, and a second through groove is formed in the mounting plate 12.

[0029] In the technical solution, bolts 10 can be arranged on the mounting frame 5, the bolts 10 pass through the mounting frame 5 and the mounting plate 12 through the first through grooves 15 and the second through groove 15, and locking nuts 11 are threadedly connected to the bolts 10.

[0030] In the technical solution, a valve 6 is arranged on the gas conveying main pipe 1.

[0031] In the technical solution, a flange plate 7 is fixedly installed at one end of the gas conveying main pipe 1.

[0032] In the technical solution, a plurality of installation holes 16 are arranged on the flange plate 7.

[0033] In use, the gas supply main pipe 1 is stably connected to an external gas source through the flange plate 7, the installation holes on the flange plate 7 can be sealed and fixed to the external gas source input pipe through the bolts 10, to avoid ammonia leakage and ensure the safety and sealing of the gas source supply; the valve 6 can flexibly adjust the ammonia flow in the gas supply main pipe 1, to accurately control the total gas supply according to the flue gas, to avoid ammonia escape caused by excessive ammonia or insufficient use affecting the denitration efficiency; the ammonia gas is branched from the gas supply main pipe 1 to the gas supply branch pipes 2 on both sides, and is uniformly sprayed out through the plurality of gas outlet pipes 3 on the gas supply branch pipes 2, to form a multi-point and multi-directional spraying layout; the initial distribution of the ammonia gas in the flue is ensured to be more uniform, to lay a foundation for subsequent mixing with the flue gas and reduce local concentration deviation.

[0034] The mounting frame 5 supports the rotating shaft 8 through the connecting frame 9, the spoiler 4 on the rotating shaft 8 can rotate around the rotating shaft 8 under the airflow impact of the flue gas and the ammonia gas, to form an airflow field with a specific flow direction; the inclined spoiler 4 can generate directional pushing action on the surrounding ammonia gas and flue gas, to force the two gases, which may flow in layers, to penetrate and interweave with each other; at the same time, the ammonia gas sprayed out of the gas outlet pipe 3 can be diffused to a wider range, to avoid the ammonia gas being concentrated in a local area, greatly increasing the contact area and contact time of the ammonia gas and the flue gas, to promote the two to mix more quickly and more fully, to create favorable conditions for efficient denitration reaction; when the flue gas flow rate or direction changes, the rotating speed of the fan-shaped spoiler 4 will change with the change of the flue gas flow rate in adaptive adjustment; when the flue gas flow rate is fast, the impact force of the airflow on the spoiler 4 increases, the spoiler 4 rotates faster, and the disturbance effect is enhanced, to better cope with the fast-flowing flue gas and ensure that the ammonia gas can be mixed with the flue gas in time; when the flue gas flow rate is slow, the spoiler 4 rotates slower, to avoid unnecessary energy loss caused by excessive disturbance; this self-adaptive adjustment without additional power driving can flexibly adapt to airflow changes under different working conditions, to ensure that a good mixing effect can be maintained under various operating conditions; this self-adaptive rotation without additional power driving can dynamically optimize the disturbance intensity according to the real-time airflow state, to solve the problem that the traditional fixed spoiler structure is difficult to adapt to complex airflow changes.

[0035] At the same time, the dust moves away from the gas outlet pipe 3 along the rotating inclined spoiler 4, to avoid the dust gathering at the mouth of the gas outlet pipe 3, to ensure that the gas outlet pipe 3 always remains unobstructed, to ensure that the ammonia gas can be stably and uniformly sprayed out, to maintain efficient denitration reaction, to reduce the frequency and difficulty of manual cleaning, to reduce the maintenance cost, and to improve the continuous operation time and stability of the device; The conical guide seat 14 is located at the top end of the rotating shaft 8, and its streamlined surface can divert the oncoming airflow to the four directions, guide the ammonia and flue gas to diffuse along the surface of the guide seat 14, avoid the formation of vortex dead zones in the local airflow, and expand the mixing range. At the same time, the guide seat 14 rotates synchronously with the rotating shaft 8, further enhances the rotating disturbance effect of the airflow, and makes the ammonia and flue gas quickly interweave during the diffusion process, greatly improving the mixing uniformity. The mounting frame 5 and the mounting plate 12 are connected by plug-in cooperation, the bolt 10 passes through the first through slot 15 and the second through slot 15 and is fixed with the locking nut 11, which allows quick disassembly and position adjustment. Different specifications of the flow guide assembly can be flexibly replaced according to the size of the flue or the denitration requirement, which enhances the adaptability of the device to different working conditions and reduces the maintenance and modification cost.

[0036] The application has the following advantages: 1. The rotating shaft 8 is supported by the mounting frame 5 through the connecting frame 9. The spoiler 4 on the rotating shaft 8 can rotate around the rotating shaft 8 under the impact of the airflow of the flue gas and the ammonia, forming an airflow field with a specific flow direction. The inclined spoiler 4 can produce directional pushing effect on the surrounding ammonia and flue gas, forcing the two gases which may flow in layers to interpenetrate and interweave. At the same time, the ammonia gas sprayed from the air outlet pipe 3 can be diffused to a wider range, avoiding the concentration of ammonia gas in the local area, greatly increasing the contact area and contact time of ammonia gas and flue gas, and promoting the faster and more sufficient mixing of the two, creating favorable conditions for efficient denitration reaction. 2. The rotation speed of the spoiler 4 changes with the change of the flue gas flow rate. This self-adaptive adjustment without additional power makes the device flexible to adapt to the change of airflow under different working conditions, ensuring good mixing effect under various operating conditions. Without additional power drive, the spoiler intensity can be dynamically optimized according to the real-time airflow state, solving the problem that the traditional fixed spoiler structure is difficult to adapt to complex airflow changes. 3. The mounting frame 5 and the mounting plate 12 are connected by plug-in cooperation, the bolt 10 passes through the first through slot 15 and the second through slot 15 and is fixed with the locking nut 11, which allows quick disassembly and position adjustment. Different specifications of the flow guide assembly can be flexibly replaced according to the size of the flue or the denitration requirement, which enhances the adaptability of the device to different working conditions and reduces the maintenance and modification cost.

[0037] The circuits and electronic components and modules involved are prior art, and those skilled in the art can implement them without further description. The content protected by the application does not involve improvement of software and methods.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A denitration ammonia injection grid device with self-adaptive flow guiding characteristics, comprising a gas conveying main pipe (1), characterized in that: The gas conveying main pipe (1) is communicated with a plurality of equidistantly distributed gas conveying branch pipes (2) on both sides, and a plurality of equidistantly distributed gas outlet pipes (3) are communicated on the gas conveying branch pipes (2); A plurality of equidistantly distributed rotating spoiler plates (4) are arranged at the outlet end of the gas outlet pipe (3), the spoiler plates (4) are arranged in parallel with the outlet end of the gas outlet pipe (3), and there is a spacing between the spoiler plates and the outlet end of the gas outlet pipe (3).

2. The ammonia injection lattice device for NOx reduction with adaptive flow guiding characteristics according to claim 1, characterized in that Further comprising a mounting frame (5), a connecting frame (9) is fixedly installed on the mounting frame (5), a rotating shaft (8) is rotatably connected to the connecting frame (9) through a bearing, a plurality of equidistantly distributed spoiler plates (4) are fixedly installed on the rotating shaft (8), and a guide seat (14) is fixedly installed at the top end of the rotating shaft (8). The bottom end of the rotating shaft (8) is fixedly installed with a limiting plate (13).

3. The ammonia injection lattice device for NOx reduction with adaptive flow guiding characteristics according to claim 2, characterized in that The guide seat (14) is conical in shape.

4. The ammonia injection lattice device for NOx reduction with adaptive flow guiding characteristics according to claim 1, characterized in that: The plurality of spoiler plates (4) are all arranged in an inclined manner.

5. The ammonia injection lattice device for NOx reduction with adaptive flow guiding characteristics according to claim 1, characterized in that: The mounting frame (5) is "U"-shaped, the mounting frame (5) is matched with the mounting plate (12), and the mounting frame (5) can be inserted into the mounting plate (12).

6. The ammonia injection lattice device for NOx reduction with adaptive flow guiding characteristics according to claim 1, characterized in that: Two first through holes (15) are formed in the mounting frame (5), and a second through hole is also formed in the mounting plate (12).

7. The ammonia injection lattice device for NOx reduction with adaptive flow guiding characteristics according to claim 6, characterized in that A bolt (10) can be arranged on the mounting frame (5), the bolt (10) penetrates the mounting frame (5) and the mounting plate (12) through the first through hole (15) and the second through hole, and is threadedly connected with a locking nut (11).

8. The ammonia injection lattice device for NOx reduction with adaptive flow guiding characteristics according to claim 1, characterized in that: The gas conveying main pipe (1) is provided with a valve (6).

9. The ammonia injection lattice device for NOx reduction with adaptive flow guiding characteristics according to claim 8, characterized in that: One end of the gas conveying main pipe (1) is fixedly installed with a flange plate (7).

10. The ammonia injection lattice device with adaptive flow guiding characteristics according to claim 9, characterized in that: A plurality of equidistantly distributed mounting holes (16) are formed in the flange plate (7).

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