Denitration ammonia gas and dilution air mixing device

Abstract

The utility model discloses a denitration ammonia gas and dilution air mixing device, which belongs to the technical field of denitration system ammonia gas mixing and comprises a mixing pipe, the mixing pipe comprises an air inlet section, a transmission section and a mixing section, and the transmission section is communicated with an ammonia gas pipe; the rotating shaft is rotationally arranged in the mixing pipe and is of a hollow structure, and a plurality of disturbance blades are arranged on the rotating shaft; ammonia gas in the ammonia gas pipe passes through the connecting sleeve and the interior of the rotating shaft and then is exhausted through the exhaust component; according to the scheme, in the use process, under the condition that the ammonia gas exhaust position of the exhaust component and the exhaust component rotates to exhaust gas, ammonia gas can be in contact and mixed with dilution air at all positions of the mixing section, and the ammonia gas and the dilution air in the mixing section are stirred and mixed through rotation of the exhaust component; the contact time of ammonia gas and dilution air can be prolonged, the layering phenomenon is reduced, the full contact mixing rate of the ammonia gas and the dilution air can be greatly improved, and the mixing effect and efficiency are remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of ammonia mixing in a denitration system, and more specifically relates to a denitration ammonia and dilution air mixing device. Background Art

[0002] SCR denitration system is the selective catalytic reduction technology, and ammonia catalytic reduction is the most widely used technology at present. With the gradual improvement of environmental protection requirements, in order to reduce the emission of nitrogen oxides in the exhaust gas of coal-fired boilers in thermal power plants, the general selective catalytic reduction flue gas denitration method is to inject ammonia into the exhaust gas under the action of a catalyst to reduce the nitrogen oxides in the exhaust gas into nitrogen and water, so that the exhaust gas does not cause secondary pollution to the environment, and has high removal efficiency and reliable operation.

[0003] Before ammonia is sprayed into the flue gas, ammonia and dilution air are generally introduced into a mixer to dilute the concentration of ammonia to ensure the subsequent safe and effective reduction reaction and the safe use of ammonia. The mixer is mostly installed on the flue gas exhaust pipe of the boiler.

[0004] However, currently ammonia and dilution air are directly introduced into the mixer without effective mixing treatment of the ammonia and dilution air. The density of ammonia and air is different, stratification may occur, the contact area between ammonia and dilution air is small, and sufficient dispersed mixing between ammonia and dilution air cannot be achieved. There is a mixing dead zone, which results in low mixing efficiency and poor mixing effect of ammonia and dilution air.

[0005] Therefore, it is necessary to provide a denitrification ammonia and dilution air mixing device to solve the above technical problems. Utility Model Content

[0006] The utility model aims to provide a denitrification ammonia gas and dilution air mixing device to solve the above technical problems.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A denitrification ammonia gas and dilution air mixing device, comprising:

[0009] A mixing tube, the mixing tube comprising an air inlet section, a transmission section and a mixing section, the transmission section being connected to an ammonia pipe, and one end of the ammonia pipe located in the transmission section is provided with a connecting sleeve;

[0010] A rotating shaft is rotatably disposed in the mixing tube and is a hollow structure, one end of the rotating shaft is rotatably connected to the connecting sleeve through a bearing, the ammonia pipe is communicated with the interior of the rotating shaft, and a plurality of disturbance blades are arranged on the rotating shaft;

[0011] An exhaust component is arranged on the rotating shaft, and the ammonia in the ammonia pipe passes through the connecting sleeve and the interior of the rotating shaft and then is discharged through the exhaust component.

[0012] Furthermore, the exhaust component includes multiple stirring groups, each of which includes multiple stirring plates, the interior of the stirring plates is connected to the interior of the rotating shaft, the stirring plates are all located in the mixing section, and the stirring plates are provided with multiple exhaust holes connected to the interior thereof.

[0013] Furthermore, the inner walls of the transmission section and the mixing section are both provided with support plates, and the rotating shaft is rotatably connected to the support plates via bearings.

[0014] Furthermore, it also includes:

[0015] An adapter seat is embedded on the ammonia pipe, a channel is provided in the adapter seat so that the ammonia pipes at both ends are connected, and two inner grooves connected with the channel are provided in the adapter seat;

[0016] The first baffle plate and the second baffle plate are slidably disposed in the two inner grooves respectively, and a linkage component for driving the first baffle plate and the second baffle plate to move relative to each other is disposed in the transmission section.

[0017] Furthermore, the linkage component includes:

[0018] A pneumatic plate, provided with two pneumatic plates symmetrically hinged to the inner wall of the transmission section, and a first elastic member is provided between the pneumatic plate and the inner wall of the transmission section;

[0019] Two traction ropes, one end of each of the two traction ropes is connected to the two pneumatic plates respectively, the other end of one of the traction ropes movably passes through the first baffle and is connected to the second baffle, and the other end of the other traction rope movably passes through the second baffle and is connected to the first baffle;

[0020] A second elastic member is disposed between the first baffle plate and the second baffle plate and the inner wall of the inner groove.

[0021] Furthermore, a bracket is provided on the inner wall of the transmission section, a steering wheel is rotatably provided on the bracket, and the traction rope on the pneumatic plate is connected to the first baffle or the second baffle after being steered by the steering wheel.

[0022] Furthermore, the inner wall of the mixing section is provided with a plurality of guide plates which are staggered and distributed with respect to each other.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. In this scheme, when in use, the speed of the dilution air entering the transmission section from the air inlet section will be further increased. When the dilution air passes through the disturbance blade, it will drive it to rotate, that is, it will drive the rotating shaft and the exhaust component to rotate together, and the dilution air will enter the mixing section from the transmission section. At the same time, the ammonia to be diluted will enter from the ammonia pipe, pass through the connecting sleeve and the rotating shaft, and then be discharged from the exhaust component to the mixing section. First, due to the ammonia discharge position of the exhaust component and the exhaust rotation of the exhaust component, the ammonia can appear at various positions in the mixing section to contact and mix with the dilution air, and the ammonia and dilution air in the mixing section are stirred and mixed by the rotation of the exhaust component, which can increase the contact time and area of ​​ammonia and dilution air, reduce the occurrence of stratification, greatly improve the full contact mixing rate of ammonia and dilution air, effectively prevent the occurrence of mixing dead zones, significantly improve the mixing effect and efficiency, and improve the subsequent use effect of ammonia.

[0025] 2. In this solution, when the mixing tube is working, the dilution air enters the transmission section at a faster speed, which will generate pressure on the linkage component. The linkage component causes the first baffle and the second baffle to move in opposite directions, and the channel is opened, and the ammonia in the ammonia pipe will enter the rotating shaft; when the mixing tube is not working, that is, the air inlet section does not enter the dilution air, under the action of the linkage component, the first baffle and the second baffle will move towards each other and close together to block the channel. At this time, the ammonia in the ammonia pipe cannot pass through the adapter, which can avoid the discharge of high-concentration ammonia in the absence of dilution air, prevent ammonia leakage and waste, and greatly avoid the reverse reaction of ammonia in the absence of dilution air, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the external structure of the mixing tube of the utility model;

[0027] Figure 2 This is a schematic diagram of the cross-sectional structure of the mixing tube of the utility model;

[0028] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0029] Figure 4 It is a schematic diagram of the partial cross-sectional structure of the mixing tube of the utility model from other viewing angles;

[0030] Figure 5 This is a schematic diagram of the internal structure of the adapter when the mixing tube of the utility model is not working;

[0031] Figure 6 This is a schematic diagram of the internal structure of the adapter when the mixing tube of the utility model is working.

[0032] Description of the numbers in the figure:

[0033] 1. Mixing tube; 2. Air inlet section; 3. Transmission section; 4. Mixing section; 5. Ammonia pipe; 6. Connecting sleeve; 7. Rotating shaft; 8. Disturbing blade; 9. Exhaust component; 91. Stirring plate; 92. Exhaust hole; 10. Support plate; 11. Adapter seat; 12. Inner groove; 13. First baffle; 14. Linkage assembly; 141. Pneumatic plate; 142. First elastic member; 143. Traction rope; 144. Second elastic member; 15. Channel; 16. Bracket; 17. Steering wheel; 18. Guide plate; 19. Second baffle. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] See also Figure 1-2 and Figure 4 A denitrification ammonia and dilution air mixing device comprises: a mixing tube 1, the mixing tube 1 comprises an air inlet section 2, a transmission section 3 and a mixing section 4, the transmission section 3 is connected with an ammonia pipe 5, and one end of the ammonia pipe 5 located in the transmission section 3 is provided with a connecting sleeve 6; a rotating shaft 7, which is rotatably arranged in the mixing tube 1 and has a hollow structure, one end of the rotating shaft 7 is rotatably connected to the connecting sleeve 6 through a bearing, the ammonia pipe 5 is communicated with the interior of the rotating shaft 7, and a plurality of disturbance blades 8 are provided on the rotating shaft 7; an exhaust component 9, which is arranged on the rotating shaft 7, and the ammonia in the ammonia pipe 5 passes through the connecting sleeve 6 and the interior of the rotating shaft 7 and is discharged through the exhaust component 9.

[0036] When in use, the dilution air is introduced from the air inlet section 2 of the mixing tube 1. When the dilution air enters the air inlet section 2, it has a relatively high pressure and speed. After that, when the dilution air enters the transmission section 3 from the air inlet section 2, since the inner diameter of the transmission section 3 is smaller than that of the air inlet section 2, the speed at which the dilution air enters the transmission section 3 can be further increased, that is, the dilution air will have a relatively high flow rate in the transmission section 3. When the dilution air passes through the disturbance blade 8, it will drive it to rotate. At this time, the rotation of the disturbance blade 8 will drive the rotating shaft 7 to rotate. One end of the rotating shaft 7 will rotate along the connecting sleeve 6 while the ammonia pipe 5 is fixed. The rotating shaft 7 will drive the exhaust component 9 to rotate together. The dilution air will then enter the mixing section 4 from the transmission section 3. In the mixing section 4, the dilution air speed will become smaller than that of the transmission section 3, which can increase its subsequent mixing contact time with ammonia, thereby improving the mixing effect of ammonia and dilution air. At the same time, ammonia to be diluted will be introduced from the ammonia pipe 5, and the ammonia will enter the rotating shaft 7 through the connecting sleeve 6, and finally be discharged from the exhaust component 9 on the rotating shaft 7 into the mixing section 4. Firstly, due to the ammonia discharge position of the exhaust component 9 and the exhaust rotation of the exhaust component 9, the ammonia can appear at various positions of the mixing section 4 to contact and mix with the dilution air, and the ammonia and dilution air in the mixing section 4 are stirred and mixed by the rotation of the exhaust component 9, which can increase the contact time and area of ​​the ammonia and the dilution air, reduce the occurrence of stratification, greatly improve the full contact mixing rate of the ammonia and the dilution air, effectively prevent the occurrence of mixing dead zones, significantly improve the mixing effect and efficiency, and improve the subsequent use effect of ammonia.

[0037] In this embodiment, preferably, please refer to Figure 2 , the exhaust component 9 includes a plurality of stirring groups, each of which includes a plurality of stirring plates 91, the interior of the stirring plates 91 is connected to the interior of the rotating shaft 7, the stirring plates 91 are all located in the mixing section 4, and a plurality of exhaust holes 92 are provided on the stirring plates 91 that are connected to the interior thereof. The ammonia gas that enters the rotating shaft 7 will enter the stirring plates 91 again, and will eventually be discharged from the exhaust holes 92 into the mixing section 4, and the ammonia gas discharged through the exhaust holes 92 at various positions can be in more comprehensive contact with the dilution air in the mixing section 4; and when the rotating shaft 7 rotates, it will drive the stirring plates 91 and the exhaust holes 92 to rotate together, so that the ammonia gas discharged from the exhaust holes 92 can be dispersed in various places in the mixing section 4 to contact with the dilution air, with a large contact area and a good mixing effect. Furthermore, the rotation of the stirring plates 91 will stir the dilution air and ammonia gas in the mixing section 4, so that the dilution air and ammonia gas are mixed more fully and the mixing effect is good.

[0038] In this embodiment, preferably, please refer to Figure 2 and Figure 4The inner walls of the transmission section 3 and the mixing section 4 are both provided with support plates 10, and the rotating shaft 7 is rotatably connected to the support plates 10 through bearings. The support plates 10 can support the rotating shaft 7, and can ensure that the rotating shaft 7 can rotate stably, thereby improving the ammonia discharge and mixing effects.

[0039] In this embodiment, preferably, please refer to Figure 2 and Figure 4-6 , further comprising: an adapter 11, which is embedded in the ammonia pipe 5, and a channel 15 is provided in the adapter 11 to communicate with the ammonia pipes 5 at both ends, and two inner grooves 12 communicating with the channel 15 are provided in the adapter 11; a first baffle 13 and a second baffle 19 are respectively slidably disposed in the two inner grooves 12, and a linkage component 14 is provided in the transmission section 3 to drive the first baffle 13 and the second baffle 19 to move relative to each other.

[0040] When the mixing tube 1 is working and the dilution air enters the transmission section 3 from the air inlet section 2, the dilution air generates a large pressure due to its high speed. The dilution air generates pressure on the linkage assembly 14, and the linkage assembly 14 drives the first baffle 13 and the second baffle 19 to slide along the inner groove 12. At this time, the first baffle 13 and the second baffle 19 move in opposite directions. At this time, the channel 15 between the first baffle 13 and the second baffle 19 is opened. Figure 6 That is, the ammonia pipes 5 on both sides of the adapter 11 are connected. At this time, the ammonia in the ammonia pipe 5 will pass through the adapter 11 and then enter the rotating shaft 7 through the connecting sleeve 6 to achieve the discharge of ammonia.

[0041] When the mixing tube 1 is not working, that is, the air inlet section 2 does not enter the dilution air, the first baffle 13 and the second baffle 19 in the adapter 11 will move towards each other under the action of the linkage assembly 14, and finally close together to block the channel 15. Figure 5 At this time, the ammonia in the ammonia pipe 5 cannot pass through the adapter 11, which can avoid the discharge of high-concentration ammonia in the absence of dilution wind, prevent the leakage and waste of ammonia, and greatly avoid the reverse reaction of ammonia in the absence of dilution wind, which is highly practical.

[0042] In this embodiment, preferably, please refer to Figure 2-6The linkage assembly 14 includes: a pneumatic plate 141, which is provided with two and symmetrically hinged to the inner wall of the transmission section 3, and a first elastic member 142 is provided between the pneumatic plate 141 and the inner wall of the transmission section 3. The first elastic member 142 in this application is a spring; two traction ropes 143, one end of the two traction ropes 143 is respectively connected to the two pneumatic plates 141, the other end of one of the traction ropes 143 movably passes through the first baffle 13 and is connected to the second baffle 19, and the other end of the other traction rope 143 movably passes through the second baffle 19 and is connected to the first baffle 13; a second elastic member 144 is provided between the first baffle 13 and the second baffle 19 and the inner wall of the inner groove 12, and the second elastic member 144 in this application is a spring.

[0043] Initially, that is, when the mixing tube 1 is not working, the pneumatic plate 141 and the first elastic member 142 are in a normal state. Figure 2 and Figure 4 At this time, the traction rope 143 is in a pulled state, such as Figure 5 As shown, the traction rope 143 on one side will pass through the first baffle 13 and pull the second baffle 19, and the traction rope 143 on the other side will pass through the second baffle 19 and pull the first baffle 13. At this time, due to the pulling force of the traction rope 143 on the first baffle 13 and the second baffle 19, the second elastic member 144 is in a stretched state, and the first baffle 13 and the second baffle 19 will also block the channel 15.

[0044] When working, when the dilution wind enters the transmission section 3 from the air inlet section 2, the dilution wind will squeeze the pneumatic plates 141, so that the pneumatic plates 141 on both sides are pushed open, that is, the pneumatic plates 141 rotate toward the mixing section 4, and the dilution wind will continue to pass through the transmission section 3 to the mixing section 4. At the same time, the rotating pneumatic plates 141 will relax the traction rope 143, and the first baffle 13 and the second baffle 19 will also be gradually reduced by the pulling force of the traction rope 143, and then the first baffle 13 and the second baffle 19 will be driven back to the initial position by the rebound force of the second elastic member 144, that is, the first baffle 13 and the second baffle 19 move away from each other and no longer block the channel 15, so that the discharge of ammonia can be achieved.

[0045] In this embodiment, preferably, please refer to Figure 2-3 A bracket 16 is provided on the inner wall of the transmission section 3, and a steering wheel 17 is rotatably provided on the bracket 16. The traction rope 143 on the pneumatic plate 141 is connected to the first baffle 13 or the second baffle 19 after being turned by the steering wheel 17. The traction rope 143 is rotated by the steering wheel 17, so that the traction rope 143 can stably drive the first baffle 13 or the second baffle 19 to move, so that the force is more uniform, and the steering wheel 17 can reduce the friction and wear of the traction rope 143, thereby improving its service life and use effect.

[0046] In this embodiment, preferably, please refer to Figure 2 The inner wall of the mixing section 4 is provided with a plurality of guide plates 18 which are arranged in an interlaced manner. The setting of the guide plates 18 can change the flow state of ammonia gas and dilution air in the mixing section 4, so that the ammonia gas and dilution air take an "S"-shaped trajectory, achieve a guide effect, greatly increase the contact and mixing time of ammonia gas and dilution air, and further enable the ammonia gas and dilution air to be well dispersed and fully mixed, further improving the mixing effect.

[0047] It should be understood that the examples and implementation modes described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art may make various modifications or changes based on the examples and implementation modes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0048] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that satisfy both A and B. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

Claims

1. A denitrification ammonia gas and dilution air mixing device, characterized in that: include: A mixing tube (1), the mixing tube (1) comprising an air inlet section (2), a transmission section (3) and a mixing section (4), the transmission section (3) being connected to an ammonia pipe (5), and one end of the ammonia pipe (5) located inside the transmission section (3) being provided with a connecting sleeve (6); A rotating shaft (7) is rotatably disposed in the mixing tube (1) and is of a hollow structure. One end of the rotating shaft (7) is rotatably connected to the connecting sleeve (6) via a bearing. The ammonia pipe (5) is in communication with the interior of the rotating shaft (7). A plurality of disturbance blades (8) are disposed on the rotating shaft (7); An exhaust component (9) is arranged on the rotating shaft (7), and ammonia in the ammonia pipe (5) passes through the connecting sleeve (6) and the interior of the rotating shaft (7) and is then discharged through the exhaust component (9).

2. A denitrification ammonia gas and dilution air mixing device according to claim 1, characterized in that: The exhaust component (9) includes a plurality of stirring groups, each of which includes a plurality of stirring plates (91), the interior of the stirring plates (91) being in communication with the interior of the rotating shaft (7), the stirring plates (91) being located in the mixing section (4), and the stirring plates (91) being provided with a plurality of exhaust holes (92) in communication with the interior thereof.

3. The denitrification ammonia gas and dilution air mixing device according to claim 1, characterized in that: The inner walls of the transmission section (3) and the mixing section (4) are both provided with support plates (10), and the rotating shaft (7) is rotatably connected to the support plates (10) via a bearing.

4. The denitrification ammonia gas and dilution air mixing device according to claim 1, characterized in that: Also includes: An adapter (11) is embedded in the ammonia pipe (5), a channel (15) is provided in the adapter (11) so that the ammonia pipes (5) at both ends are connected, and two inner grooves (12) are provided in the adapter (11) and are connected to the channel (15); The first baffle plate (13) and the second baffle plate (19) are respectively slidably disposed in the two inner grooves (12), and a linkage assembly (14) is disposed in the transmission section (3) for driving the first baffle plate (13) and the second baffle plate (19) to move relative to each other.

5. A denitrification ammonia gas and dilution air mixing device according to claim 4, characterized in that: The linkage component (14) comprises: The pneumatic plates (141) are provided with two and are symmetrically hinged to the inner wall of the transmission section (3); a first elastic member (142) is provided between the pneumatic plates (141) and the inner wall of the transmission section (3); Two traction ropes (143), one end of each of the two traction ropes (143) being connected to the two pneumatic plates (141) respectively, the other end of one of the traction ropes (143) movably passing through the first baffle plate (13) and being connected to the second baffle plate (19), and the other end of the other traction rope (143) movably passing through the second baffle plate (19) and being connected to the first baffle plate (13); A second elastic member (144) is provided between the first baffle plate (13) and the second baffle plate (19) and the inner wall of the inner groove (12).

6. A denitrification ammonia gas and dilution air mixing device according to claim 5, characterized in that: A bracket (16) is provided on the inner wall of the transmission section (3), and a steering wheel (17) is rotatably provided on the bracket (16). The traction rope (143) on the pneumatic plate (141) is turned by the steering wheel (17) and then connected to the first baffle (13) or the second baffle (19).

7. The denitrification ammonia gas and dilution air mixing device according to claim 1, characterized in that: The inner wall of the mixing section (4) is provided with a plurality of guide plates (18) which are distributed in an interlaced manner.

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