Efficient ammonia gas and air mixer for denitration system

Abstract

The utility model relates to the technical field of denitration systems, and discloses an efficient ammonia and air mixer for a denitration system, which comprises a mixing pipe main body, two sides of the mixing pipe main body are fixedly connected with an ammonia inlet and an air inlet respectively, and two ends of the mixing pipe main body are fixedly connected with sealing discs respectively. A driving box is mounted on the outer surface of the sealing disc, and a driving mechanism is arranged in the driving box, so that the device can drive a first flow guide part and a second flow guide part to rotate through the driving mechanism while air passes through the device, and then mixed gas of ammonia gas and air forms vortex through collision after convective mixing; and then the speed change mechanism drives the scattering plate to rotate, so that the scattering plate can scatter the gas flow, the device can fully and uniformly mix the gas, and the mixing efficiency and quality of the device are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of denitration systems, in particular to an ammonia-air high-efficiency mixer for a denitration system. Background Art

[0002] SCR denitrification technology is highly valued and widely used in the power industry for its high removal efficiency and adaptability to current environmental protection requirements. In developed countries with strict environmental protection requirements such as Germany, Japan, the United States, Canada, the Netherlands, Austria, Sweden, Denmark and other countries, SCR denitrification technology has become one of the most widely used and mature technologies. According to the experience of developed countries, SCR denitrification technology will inevitably become the main denitrification technology for coal-fired boilers in my country's thermal power plants and will be used more and more widely. The SCR system generally consists of an ammonia storage system, an ammonia and air mixing system, an ammonia injection system, a reactor system, a detection and control system, etc. Liquid ammonia is sent from the liquid ammonia tank truck to the liquid ammonia storage tank by the unloading compressor, and then evaporated into ammonia gas in the evaporator tank and then enters the boiler area through the ammonia buffer tank and the delivery pipeline. After being evenly mixed with air, it is distributed by the ammonia spray grid and enters the SCR reactor for internal reaction. The SCR reactor is set in front of the air preheater. Ammonia is evenly distributed and mixed with flue gas above the SCR reactor through a special spray device. After mixing, the flue gas undergoes reduction reaction through the catalyst layer in the reactor.

[0003] For example, the Chinese patent with patent application number 202121274127.4 is a high-efficiency ammonia-air mixer for an SCR denitrification device. This patent adopts a 90° bend in the connecting pipe body to be flush with the downstream direction, and opens a number of through holes on the surface of the connecting pipe body, cooperates with a number of mixing blades arranged on the inner wall of the mixing pipe body, and the mixing blades are inclined at an angle to the inner wall of the mixing pipe body. The mixing blades change the flow state of the fluid in the pipe to achieve good dispersion and sufficient mixing between ammonia and air, greatly improving the mixing efficiency, without moving parts, compact structure, low energy consumption, low investment, high operating flexibility, and good mixing performance.

[0004] However, the above patent has a low mixing efficiency of ammonia and air during use, resulting in a large amount of time required to mix ammonia and air during the denitrification process, which seriously affects the denitrification process efficiency. Utility Model Content

[0005] The utility model aims to provide an ammonia-air high-efficiency mixer for a denitration system, which solves the problems raised in the background technology.

[0006] An embodiment of the present application provides an ammonia-air high-efficiency mixer for a denitrification system, comprising a mixing tube body, both sides of which are fixedly connected with an ammonia inlet and an air inlet, respectively, both ends of the mixing tube body are fixedly connected with sealing disks, a driving box is mounted on the outer surface of the sealing disk, a driving mechanism is arranged inside the driving box, a first flow guide member and a second flow guide member are movably connected inside the mixing tube body through the driving mechanism, and a breaking plate is movably connected to one side of the second flow guide member through a speed change mechanism.

[0007] By adopting the above technical solution, the device can quickly mix ammonia and air, thereby greatly improving the practicability of the device.

[0008] Optionally, the driving mechanism includes a driving disk arranged inside a driving box, a plurality of driving blades are fixedly connected to the outer surface of the driving disk, a driving shaft is fixedly connected to the interior of the driving disk, and the other end of the driving shaft extends to the interior of the mixing tube body.

[0009] By adopting the above technical solution, the device can drive the first guide member and the second guide member to rotate through the driving mechanism while the air passes through, so that the mixed gas of ammonia and air forms a vortex through collision after convection mixing, thereby greatly improving the mixing efficiency of the gas.

[0010] Optionally, the speed change mechanism includes a rotating drum rotatably arranged on one side of the second guide member and a driving gear installed on the outer surface of the driving shaft, the inner wall of the rotating drum is fixedly connected to a driven rack, the outer wall of the rotating drum is fixedly connected to a breaking plate, and the driving gear and the driven rack are meshingly connected.

[0011] By adopting the above technical solution, the device can drive the scattering plate to rotate through the speed change mechanism, so that the scattering plate can scatter the airflow, and then the device can mix the gas more fully and evenly, thereby greatly improving the mixing efficiency and quality of the device.

[0012] Optionally, guide grooves are provided inside the first guide member and the second guide member.

[0013] By adopting the above technical solution, the mixing efficiency of ammonia and air can be accelerated by utilizing the guide groove.

[0014] Optionally, the angle between the breaking plate and the driving shaft is forty-five degrees.

[0015] By adopting the above technical solution and utilizing the scattering plates at staggered angles, the mixing efficiency of the device can be fully improved.

[0016] Optionally, one end of the air inlet is fixedly connected to the drive box via a pipeline, and a boost valve is provided on the outer surface of the pipeline.

[0017] By adopting the above technical solution, the air pressure value can be increased by using the boost valve, thereby making the driving force more sufficient.

[0018] Optionally, a sealing ring is provided at the connection between the sealing disk and the mixing tube body.

[0019] By adopting the above technical solution, the sealing performance of the device can be improved by using a sealing ring.

[0020] Optionally, a plurality of threaded holes are provided on the surface of the sealing disk.

[0021] By adopting the above technical solution, the device can be installed and connected more conveniently using the threaded holes.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0023] The technical solution of the present application is to set a drive box, a drive disk, a drive blade, a drive shaft, a first guide member, a second guide member, a driving gear, a rotating drum, a driven rack and a breaking plate, so that the device can drive the first guide member and the second guide member to rotate through the driving mechanism while the air passes through, so that the mixed gas of ammonia and air forms a vortex through collision after convection mixing, thereby greatly improving the mixing efficiency of the gas, and then drive the breaking plate to rotate through the speed change mechanism, so that the breaking plate can break up the airflow, and then the device can mix the gas more fully and evenly, thereby greatly improving the mixing efficiency and quality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0025] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the ammonia-air high-efficiency mixer for the denitration system of the utility model;

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure inside the main body of the mixing tube in the ammonia-air high-efficiency mixer for the denitration system of the utility model;

[0027] Figure 3 It is a three-dimensional structural schematic diagram of the connecting part of the driving gear and the drum in the ammonia-air high-efficiency mixer for the denitration system of the utility model;

[0028] Figure 4 The utility model is a schematic diagram of the structure inside the driving box of the ammonia-air high-efficiency mixer for the denitration system.

[0029] In the figure: 1. mixing tube body; 2. sealing plate; 3. ammonia inlet; 4. air inlet; 5. drive box; 6. drive plate; 7. drive blades; 8. drive shaft; 9. first guide piece; 10. second guide piece; 11. driving gear; 12. rotating drum; 13. driven rack; 14. breaking plate; 15. guide groove. DETAILED DESCRIPTION

[0030] See also Figure 1-4 The utility model provides a technical solution: an ammonia-air high-efficiency mixer for a denitration system, comprising a mixing tube body 1, both sides of the mixing tube body 1 are fixedly connected with an ammonia inlet 3 and an air inlet 4, both ends of the mixing tube body 1 are fixedly connected with a sealing disk 2, a driving box 5 is installed on the outer surface of the sealing disk 2, a driving mechanism is arranged inside the driving box 5, a first flow guide 9 and a second flow guide 10 are movably connected inside the mixing tube body 1 through the driving mechanism, and a breaking plate 14 is movably connected to one side of the second flow guide 10 through a speed change mechanism.

[0031] By adopting the above technical solution, the device can quickly mix ammonia and air, thereby greatly improving the practicability of the device.

[0032] In the implementation mode of the present application, Figure 4 As shown, the driving mechanism includes a driving disk 6 arranged inside the driving box 5, and a plurality of driving blades 7 are fixedly connected to the outer surface of the driving disk 6. A driving shaft 8 is fixedly connected to the inside of the driving disk 6, and the other end of the driving shaft 8 extends to the inside of the mixing tube body 1.

[0033] By adopting the above technical solution, the device can drive the first guide member 9 and the second guide member 10 to rotate through the driving mechanism while passing the air, so that the mixed gas of ammonia and air forms a vortex through collision after convection mixing, thereby greatly improving the mixing efficiency of the gas.

[0034] In the implementation mode of the present application, Figure 2-3 As shown, the speed change mechanism includes a rotating drum 12 rotatably arranged on one side of the second guide member 10 and a driving gear 11 installed on the outer surface of the driving shaft 8, the inner wall of the rotating drum 12 is fixedly connected to a driven rack 13, the outer wall of the rotating drum 12 is fixedly connected to a breaking plate 14, and the driving gear 11 and the driven rack 13 are meshingly connected.

[0035] By adopting the above technical solution, the device can drive the scattering plate 14 to rotate through the speed change mechanism, so that the scattering plate 14 can scatter the airflow, and then the device can mix the gas more fully and evenly, thereby greatly improving the mixing efficiency and quality of the device.

[0036] In the implementation mode of the present application, Figure 2 As shown, guide grooves 15 are provided inside the first guide member 9 and the second guide member 10 .

[0037] By adopting the above technical solution, the mixing efficiency of ammonia and air can be accelerated by utilizing the guide groove 15 .

[0038] In the implementation mode of the present application, Figure 2 As shown, the angle between the scattering plate 14 and the driving shaft 8 is forty-five degrees.

[0039] By adopting the above technical solution and utilizing the staggered angled scattering plates 14, the mixing efficiency of the device can be fully improved.

[0040] In the implementation mode of the present application, Figure 1 As shown, one end of the air inlet 4 is fixedly connected to the drive box 5 through a pipeline, and a boost valve is provided on the outer surface of the pipeline.

[0041] By adopting the above technical solution, the air pressure value can be increased by using the boost valve, thereby making the driving force more sufficient.

[0042] In the implementation mode of the present application, Figure 1 As shown, a sealing ring is provided at the connection between the sealing disk 2 and the mixing tube body 1 .

[0043] By adopting the above technical solution, the sealing performance of the device can be improved by using a sealing ring.

[0044] In the implementation mode of the present application, Figure 1 As shown, a plurality of threaded holes are arranged on the surface of the sealing disk 2 .

[0045] By adopting the above technical solution, the device can be installed and connected more conveniently using the threaded holes.

[0046] During use, the operator can introduce ammonia and external air into the mixing tube body 1 through the ammonia inlet 3 and the air inlet 4 respectively, so that the ammonia and the external air form convection, so that the ammonia can be fully mixed with the air, and it is beneficial to the diffusion of ammonia molecules, thereby improving the overall mixing effect. When the air is introduced into the mixing tube body 1, it will pass through the drive box 5, so that the driving blades 7 inside the drive box 5 will rotate under the impetus of air pressure. When the driving blades 7 rotate, they will drive the driving disk 6 to rotate. When the driving disk 6 rotates, it will drive the driving shaft 8 to rotate. When the driving shaft 8 rotates, it will drive the first guide member 9 and the first guide member 9 to rotate. The two guide members 10 rotate, driving the driving gear 11 to rotate. When the first guide member 9 and the second guide member 10 rotate, they will collide with the mixed gas of ammonia and air, thereby forming a vortex, thereby greatly improving the mixing efficiency of the gas. When the driving gear 11 rotates, it will drive the driven rack 13 to rotate by meshing. When the driven rack 13 rotates, it will drive the rotating drum 12 to rotate, so that the rotating drum 12 can drive the scattering plate 14 to rotate, and then the scattering plate 14 can scatter the airflow, so that the device can mix the gas more fully and evenly, thereby greatly improving the mixing efficiency and quality of the device.

Claims

1. An ammonia-air high-efficiency mixer for a denitration system, comprising a mixing tube body (1), characterized in that: The two sides of the mixing tube body (1) are respectively fixedly connected with an ammonia inlet (3) and an air inlet (4), and the two ends of the mixing tube body (1) are fixedly connected with a sealing disk (2). A driving box (5) is installed on the outer surface of the sealing disk (2), and a driving mechanism is arranged inside the driving box (5). The interior of the mixing tube body (1) is movably connected with a first guide member (9) and a second guide member (10) through the driving mechanism, and one side of the second guide member (10) is movably connected with a breaking plate (14) through a speed change mechanism.

2. The ammonia-air high-efficiency mixer for a denitration system according to claim 1, characterized in that: The driving mechanism comprises a driving disc (6) arranged inside a driving box (5), a plurality of driving blades (7) are fixedly connected to the outer surface of the driving disc (6), a driving shaft (8) is fixedly connected to the inside of the driving disc (6), and the other end of the driving shaft (8) extends to the inside of the mixing tube body (1).

3. The ammonia-air high-efficiency mixer for a denitration system according to claim 2, characterized in that: The speed change mechanism comprises a rotating drum (12) rotatably arranged on one side of the second flow guide member (10) and a driving gear (11) mounted on the outer surface of the driving shaft (8); the inner wall of the rotating drum (12) is fixedly connected to a driven rack (13); the outer wall of the rotating drum (12) is fixedly connected to a scattering plate (14); and the driving gear (11) and the driven rack (13) are meshingly connected.

4. The ammonia-air high-efficiency mixer for a denitration system according to claim 1, characterized in that: The first flow guide member (9) and the second flow guide member (10) are both provided with flow guide grooves (15) inside.

5. The ammonia-air high-efficiency mixer for a denitration system according to claim 2, characterized in that: The angle between the scattering plate (14) and the driving shaft (8) is forty-five degrees.

6. The ammonia-air high-efficiency mixer for a denitration system according to claim 1, characterized in that: One end of the air inlet (4) is fixedly connected to the drive box (5) via a pipeline, and a boost valve is provided on the outer surface of the pipeline.

7. The ammonia-air high-efficiency mixer for a denitration system according to claim 1, characterized in that: A sealing ring is provided at the connection between the sealing disk (2) and the mixing tube body (1).

8. The ammonia-air high-efficiency mixer for a denitration system according to claim 1, characterized in that: The surface of the sealing disk (2) is provided with a plurality of threaded holes.

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