An ammonia injection device for SCR denitrification of catalytic cracking flue gas

Abstract

The present invention belongs to the field of ammonia spraying for denitrification, and specifically discloses an ammonia spraying device for catalytic cracking flue gas SCR denitrification, including a flue, a variable speed turbulent ammonia spraying part, a chained on-off contact enhancement device and a driving device. According to the short contact time between flue gas and ammonia during denitrification, a chained intermittent closed barrier method is adopted to increase the reaction time of flue gas and ammonia, reduce the escape rate of ammonia, and achieve the technical effect of long-contact denitrification of flue gas and ammonia; without changing the amount of ammonia injected, the effect of variable speed spraying of ammonia is achieved, the mixing rate of ammonia and flue gas is increased, and the flow rate of the airflow is increased, achieving the technical effect of high-quality and high-efficiency desulfurization.

Description

Technical Field

[0001] The invention belongs to the technical field of ammonia injection for denitration, and specifically refers to an ammonia injection device for SCR denitration of catalytic cracking flue gas. Background Art

[0002] Nitrogen oxides are one of the main sources of air pollution. As the world pays more and more attention to environmental protection issues, it is particularly important to control the emission of nitrogen oxides. Flue gas denitrification technology can effectively reduce the emission of nitrogen oxides in flue gas. At present, the most widely used and most effective flue gas denitrification mainstream technology is SCR denitrification technology, that is, selective catalytic reduction technology, which uses the reduction function of ammonia on nitrogen oxides and reduces nitrogen oxides to nitrogen and water with less impact on the atmosphere under the action of catalysts.

[0003] The reducing agent used in SCR denitrification technology needs to be evenly sprayed into the flue through the corresponding ammonia injection device for contact reduction with the flue gas. The traditional ammonia injection device has a short contact time between ammonia and flue gas, which directly affects the operating efficiency and effect of the denitrification system. When the contact is short and the reaction is insufficient, it will lead to low denitrification efficiency, high ammonia escape rate, waste, increased costs and other adverse effects. In severe cases, it will also affect the safe and stable operation of the boiler host. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an ammonia injection device for catalytic cracking flue gas SCR denitrification. According to the situation that the contact time between flue gas and ammonia is short during denitrification, a chain intermittent closed barrier method is adopted to increase the reaction time of flue gas and ammonia, reduce the escape rate of ammonia, and achieve the technical effect of long-term contact denitrification between flue gas and ammonia; without changing the amount of ammonia injected, the effect of variable speed injection of ammonia is achieved, the mixing rate of ammonia and flue gas is increased, and the flow rate of the airflow is increased, thereby achieving the technical effect of high-quality and high-efficiency desulfurization.

[0005] The technical solution adopted by the present invention is as follows: The present invention provides an ammonia injection device for catalytic cracking flue gas SCR denitrification, comprising a flue, a variable speed turbulent ammonia injection component, an interlocking on-off type contact-increasing device and a driving device, wherein the variable speed turbulent ammonia injection component is arranged through the flue, the interlocking on-off type contact-increasing device is arranged in the flue, the driving device is arranged below the flue, and the interlocking on-off type contact-increasing device is connected to the driving device; the interlocking on-off type contact-increasing device comprises a fixed plate frame, a contact-increasing plate, a pull rope and a reset spring, the fixed plate frame is arranged on the inner wall of the flue, the contact-increasing plate is engaged and rotatably arranged in the fixed plate frame, a locking protrusion is arranged on the side wall of one end of the contact-increasing plate, one end of the pull rope is connected to the locking protrusion, the other end of the pull rope passes through the flue and is connected to the driving device, the reset spring is arranged in the flue, one end of the reset spring is connected to the locking protrusion, and the other end of the reset spring is connected to the flue.

[0006] Furthermore, the interlocking on-off type contact-increasing device is provided with a plurality of groups, and a trigger rod is provided on the interlocking on-off type contact-increasing device close to the speed-changing spoiler-type ammonia spraying component, and the trigger rod is connected to the contact-increasing plate.

[0007] Preferably, the driving device includes a fixed frame, a driving component, a follower component and a motor, the driving component is arranged on the fixed frame, the follower component is arranged on the fixed frame, the motor is arranged on the outer wall of the fixed frame, and the output end of the motor is connected to the driving component.

[0008] Furthermore, the driving assembly includes a driving shaft, a driving disk and a snap ring groove, the driving shaft is rotatably mounted on the fixed frame, the driving disk is fixedly sleeved on the driving shaft in an undulating manner, and the snap ring groove is arranged on the circumferential wall of the driving disk.

[0009] Among them, the follower assembly includes a follower shaft, a follower plate and a clamping piece, the follower shaft is arranged on the fixed frame, the follower plate is rotatably arranged on the follower shaft, a clamping groove is arranged on the bottom wall of the follower plate, one end of the clamping piece is clamped and slidably arranged in the clamping groove, the other end of the clamping piece is clamped and slidably arranged in the clamping ring groove, and the pull rope is connected to the follower plate.

[0010] Furthermore, the variable speed spoiler type ammonia spray component includes an ammonia spray pipe, a fixed plate, a fixed ring and a rotating variable speed spoiler assembly, the ammonia spray pipe is arranged in the flue, the fixed plate is arranged at the outlet of the ammonia spray pipe, the fixed ring is arranged on the fixed plate, and the rotating variable speed spoiler assembly is rotatably arranged on the fixed ring.

[0011] As a further preferred embodiment of the present invention, the rotating speed change spoiler assembly includes a trigger rotating plate, a rotating bent rod and a speed change spoiler control blade, the trigger rotating plate is rotatably arranged on a fixed ring, one end of the rotating bent rod is rotatably arranged on the trigger rotating plate, one end of the speed change spoiler control blade is hinged to the other end of the rotating bent rod, and the other end of the speed change spoiler control blade is rotatably arranged on the trigger rotating plate, a plurality of groups of the speed change spoiler control blades are combined to control the opening size of the fixed ring, and the number of the rotating bent rods is equal to the number of the speed change spoiler control blades.

[0012] Furthermore, a contact plate is provided on the side wall of the trigger rotating plate.

[0013] Wherein, the flue comprises a channel body and a touch-increasing reset channel, the touch-increasing reset channel is arranged on the inner side wall of the channel body, the pull rope is movably arranged in the touch-increasing reset channel, and the reset spring is telescopically arranged in the touch-increasing reset channel.

[0014] Furthermore, an ammonia injection pipe inlet is provided on the bottom wall of the channel body, and the ammonia injection pipe is arranged in the channel body through the ammonia injection pipe inlet.

[0015] The beneficial effects achieved by the present invention using the above structure are as follows: This scheme provides an ammonia injection device for SCR denitrification of catalytic cracking flue gas. According to the situation that the contact time between flue gas and ammonia is short during denitrification, a chain intermittent closed barrier method is adopted to increase the reaction time of flue gas and ammonia, reduce the escape rate of ammonia, and achieve the technical effect of long-term contact denitrification of flue gas and ammonia; without changing the amount of ammonia injected, the effect of variable speed injection of ammonia is achieved, the mixing rate of ammonia and flue gas is increased, and the flow rate of the airflow is increased, thereby achieving the technical effect of high-quality and high-efficiency desulfurization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of an ammonia injection device for SCR denitration of catalytic cracking flue gas proposed by the present invention;

[0017] Figure 2 This is a left view of an ammonia injection device for SCR denitration of catalytic cracking flue gas proposed by the present invention;

[0018] Figure 3 This is a front view of an ammonia injection device for SCR denitration of catalytic cracking flue gas proposed by the present invention;

[0019] Figure 4 This is a schematic diagram of the internal structure of an ammonia injection device for SCR denitrification of catalytic cracking flue gas proposed by the present invention;

[0020] Figure 5 A cross-sectional view of an ammonia injection device for SCR denitration of catalytic cracking flue gas proposed by the present invention;

[0021] Figure 6 It is a structural schematic diagram of the interlocking on-off type contact-increasing device;

[0022] Figure 7 is a schematic diagram of the structure of the driving device;

[0023] Figure 8 It is a structural schematic diagram of a card connector;

[0024] Fig. 9 It is a schematic diagram of the structure of a variable speed spoiler type ammonia injection component;

[0025] Fig.10 It is a structural schematic diagram of the ammonia injection pipe;

[0026] Fig.11 It is a structural schematic diagram of a rotating speed-changing spoiler assembly;

[0027] Fig.12 The schematic diagram of the structure of the flue is shown in FIG.

[0028] Fig.13 A cross-sectional view of the flue.

[0029] Among them, 1. flue, 2. variable speed spoiler type ammonia spray parts, 3. interlocking on-off type touch-increasing device, 4. driving device, 5. fixed plate frame, 6. touch-increasing plate, 7. pull rope, 8. reset spring, 9. engaging protrusion, 10. trigger rod, 11. fixed frame, 12. driving assembly, 13. follow-up assembly, 14. motor, 15. driving shaft, 16. driving disk, 17. engaging ring groove, 18. follow-up shaft, 19. follow-up plate, 20. clamping parts, 21. engaging slide groove, 22. ammonia spray pipe, 23. fixed plate, 24. fixed ring, 25. rotating variable speed spoiler assembly, 26. trigger rotating plate, 27. rotating bending rod, 28. variable speed spoiler control blade, 29. contact plate, 30. channel body, 31. touch-increasing reset channel, 32. ammonia spray pipe inlet.

[0030] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, the present invention provides an ammonia injection device for catalytic cracking flue gas SCR denitrification, comprising a flue 1, a variable speed turbulent ammonia injection component 2, an interlocking on-off type contact increasing device 3 and a driving device 4, the variable speed turbulent ammonia injection component 2 is arranged through the flue 1, the interlocking on-off type contact increasing device 3 is arranged in the flue 1, the driving device 4 is arranged below the flue 1, and the interlocking on-off type contact increasing device 3 is connected to the driving device 4.

[0034] like Figure 1 , Figure 4 , Figure 6 , Fig. 9 , Fig.10 , Fig.12 , Fig.13 As shown, the flue 1 includes a channel body 30 and a touch-increasing reset channel 31. The touch-increasing reset channel 31 is arranged on the inner wall of the channel body 30. The pull rope 7 is movably arranged in the touch-increasing reset channel 31. The reset spring 8 is telescopically arranged in the touch-increasing reset channel 31. The bottom wall of the channel body 30 is provided with an ammonia injection pipe 22 inlet, and the ammonia injection pipe 22 is arranged in the channel body 30 through the ammonia injection pipe 22 inlet.

[0035] like Figure 1 , Fig. 9 , Fig.10 , Fig.11 As shown, the variable speed spoiler ammonia spraying member 2 comprises an ammonia spraying pipe 22, a fixing plate 23, a fixing ring 24 and a rotating variable speed spoiler assembly 25. The ammonia spraying pipe 22 is arranged in the flue 1 through, the fixing plate 23 is arranged at the outlet of the ammonia spraying pipe 22, the fixing ring 24 is arranged on the fixing plate 23, and the rotating variable speed spoiler assembly 25 is rotatably arranged on the fixing ring 24; the rotating variable speed spoiler assembly 25 comprises a triggering rotating plate 26, a rotating bent rod 27 and a variable speed spoiler control blade 28, and the triggering rotating plate 26 rotates It is rotatably arranged on the fixed ring 24, one end of the rotating bent rod 27 is rotatably arranged on the trigger rotating plate 26, one end of the speed changing spoiler control blade 28 is hinged to the other end of the rotating bent rod 27, the other end of the speed changing spoiler control blade 28 is rotatably arranged on the trigger rotating plate 26, multiple groups of speed changing spoiler control blades 28 are combined to control the opening size of the fixed ring 24, the number of the rotating bent rods 27 is equal to the number of the speed changing spoiler control blades 28; a contact plate 29 is provided on the side wall of the trigger rotating plate 26.

[0036] like Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8As shown, the interlocking on-off type touch-increasing device 3 includes a fixed plate frame 5, a touch-increasing plate 6, a pull rope 7 and a reset spring 8. The fixed plate frame 5 is arranged on the inner wall of the flue 1, and the touch-increasing plate 6 is arranged in the fixed plate frame 5 for engagement and rotation. A locking protrusion 9 is provided on the side wall of one end of the touch-increasing plate 6, one end of the pull rope 7 is connected to the locking protrusion 9, and the other end of the pull rope 7 passes through the flue 1 and is connected to the driving device 4. The reset spring 8 is arranged in the flue 1, one end of the reset spring 8 is connected to the locking protrusion 9, and the other end of the reset spring 8 is connected to the flue 1; the interlocking on-off type touch-increasing device 3 is provided with a plurality of groups, and a trigger rod 10 is provided on the interlocking on-off type touch-increasing device 3 close to the variable speed spoiler type ammonia spraying part 2, and the trigger rod 10 is connected to the touch-increasing plate 6; the driving device 4 includes a fixed frame 11, a driving assembly 12, a follower assembly 13 and a motor 14, and the driving assembly 12 is arranged on the fixed The frame 11 is provided with a follower assembly 13 on the fixed frame 11, and a motor 14 is provided on the outer wall of the fixed frame 11, and the output end of the motor 14 is connected to the driving assembly 12; the driving assembly 12 includes a driving shaft 15, a driving disk 16 and a clamping ring groove 17, the driving shaft 15 is rotatably provided on the fixed frame 11, the driving disk 16 is fixedly sleeved on the driving shaft 15 in an undulating manner, and the clamping ring groove 17 is provided on the circumferential wall of the driving disk 16; the follower assembly 13 includes a follower shaft 18, a follower plate 19 and a clamping member 20, the follower shaft 18 is provided on the fixed frame 11, the follower plate 19 is rotatably provided on the follower shaft 18, and a clamping groove 21 is provided on the bottom wall of the follower plate 19, one end of the clamping member 20 is clamped and slidably provided in the clamping groove 21, and the other end of the clamping member 20 is clamped and slidably provided in the clamping ring groove 17, and the pull rope 7 is connected to the follower plate 19.

[0037] During specific use, ammonia is connected to the ammonia injection pipe 22, and the motor 14 is started. The rotation of the motor 14 drives the driving shaft 15 to rotate, and the rotation of the driving shaft 15 drives the driving disk 16 to rotate. The eccentric rotation of the driving disk 16 drives the follower plate 19 to rotate and rise around the follower shaft 18, and runs smoothly under the connecting action of the clamping piece 20 to prevent the follower plate 19 from separating from the driving disk 16. The rotation and lifting of the follower plate 19 drives the pull rope 7 to extend and retract along the touch-increasing reset channel 31. The extension and retraction of the pull rope 7 drives the engaging protrusion 9 to move along the touch-increasing reset channel 31. The engaging protrusion 9 moves and drives the touch-increasing plate 6 to rotate. The touch-increasing plate 6 rotates to alternately block and open the flue 1. The reset spring 8 can reset the touch-increasing plate 6, thereby intervening in a short-term barrier to the flue gas, thereby increasing the contact time between the flue gas and ammonia, making the denitrification more sufficient and thorough. 6 rotation drives the trigger rod 10 to rotate, when the trigger rod 10 rotates to the lowest end, it drives the contact plate 29 to rotate, the rotation of the contact plate 29 drives the trigger rotating plate 26 to rotate, the rotation of the trigger rotating plate 26 drives the rotating bent rod 27 to rotate, the rotation of the rotating bent rod 27 drives the variable speed spoiler control blade 28 to rotate, so that the outlet of the ammonia injection pipe 22 becomes smaller, the speed of ammonia spraying is increased, and then the air flow in the flue 1 is increased, the mixing speed of the flue gas and ammonia is increased, and the speed and effect of desulfurization are further enhanced. As the trigger rod 10 continues to rotate, the trigger rod 10 is separated from the contact plate 29. At this time, the outlet of the ammonia injection pipe 22 becomes larger, and the mixing rate of ammonia and flue gas is increased without affecting the amount of ammonia sprayed, thereby comprehensively improving the quality of denitrification. The above is the specific working process of the present invention, and this step can be repeated the next time it is used.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the foregoing and their equivalents.

[0040] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. An ammonia injection device for SCR denitrification of catalytic cracking flue gas, characterized by: The invention comprises a flue (1), a variable speed spoiler type ammonia spraying member (2), a chained on-off type contact increasing device (3) and a driving device (4), wherein the variable speed spoiler type ammonia spraying member (2) is arranged through the flue (1), the chained on-off type contact increasing device (3) is arranged in the flue (1), the driving device (4) is arranged below the flue (1), and the chained on-off type contact increasing device (3) is connected to the driving device (4); the chained on-off type contact increasing device (3) comprises a fixed plate frame (5), a contact increasing plate (6), a pull rope (7) and a reset spring (8), the fixed plate frame (5) is arranged on the inner wall of the flue (1), the contact increasing plate (6) is engaged and rotatably arranged on the fixed plate frame (5), and the contact increasing plate (6) is arranged on the fixed plate frame (5). In the fixed plate frame (5), a locking protrusion (9) is provided on the side wall of one end of the touch-increasing plate (6), one end of the pull rope (7) is connected to the locking protrusion (9), the other end of the pull rope (7) passes through the flue (1) and is connected to the driving device (4), the reset spring (8) is provided in the flue (1), one end of the reset spring (8) is connected to the locking protrusion (9), and the other end of the reset spring (8) is connected to the flue (1); the interlocking on-off type touch-increasing device (3) is provided with a plurality of groups, and a trigger rod (10) is provided on the interlocking on-off type touch-increasing device (3) close to the speed-changing spoiler-type ammonia spraying member (2), and the trigger rod (10) is connected to the touch-increasing plate (6); the driving device (4) comprises a fixed frame (11), a driving component (12), a follower component (13) and a motor (14); the driving component (12) is arranged on the fixed frame (11); the follower component (13) is arranged on the fixed frame (11); the motor (14) is arranged on the outer side wall of the fixed frame (11); the output end of the motor (14) is connected to the driving component (12); the driving component (12) comprises a driving shaft (15), a driving disk (16) and a locking ring groove (17); the driving shaft (15) is rotatably arranged on the fixed frame (11); the driving disk (16) is an undulating fixed sleeve The follower assembly (13) comprises a follower shaft (18), a follower plate (19) and a clamping member (20). The follower shaft (18) is arranged on the fixed frame (11). The follower plate (19) is rotatably arranged on the follower shaft (18). A clamping groove (21) is arranged on the bottom wall of the follower plate (19). One end of the clamping member (20) is clamped and slidably arranged in the clamping groove (21). The other end of the clamping member (20) is clamped and slidably arranged in the clamping groove (17). The pull rope (7) is connected to the follower plate (19).

2. The ammonia injection device for SCR denitrification of catalytic cracking flue gas according to claim 1, characterized in that: The variable speed spoiler ammonia spraying member (2) comprises an ammonia spraying pipe (22), a fixing plate (23), a fixing ring (24) and a rotating variable speed spoiler assembly (25); the ammonia spraying pipe (22) is arranged through the flue (1); the fixing plate (23) is arranged at the outlet of the ammonia spraying pipe (22); the fixing ring (24) is arranged on the fixing plate (23); and the rotating variable speed spoiler assembly (25) is rotatably arranged on the fixing ring (24).

3. The ammonia injection device for SCR denitrification of catalytic cracking flue gas according to claim 2, characterized in that: The rotating speed-changing spoiler assembly (25) comprises a trigger rotating plate (26), a rotating curved rod (27) and a speed-changing spoiler control blade (28); the trigger rotating plate (26) is rotatably mounted on the fixing ring (24); one end of the rotating curved rod (27) is rotatably mounted on the trigger rotating plate (26); one end of the speed-changing spoiler control blade (28) is hinged to the other end of the rotating curved rod (27); the other end of the speed-changing spoiler control blade (28) is rotatably mounted on the trigger rotating plate (26); and the number of the rotating curved rods (27) is equal to the number of the speed-changing spoiler control blades (28).

4. The ammonia injection device for SCR denitrification of catalytic cracking flue gas according to claim 3, characterized in that: A contact plate (29) is provided on the side wall of the trigger rotating plate (26).

5. The ammonia injection device for SCR denitrification of catalytic cracking flue gas according to claim 4, characterized in that: The flue (1) comprises a channel body (30) and a touch-increasing reset channel (31); the touch-increasing reset channel (31) is arranged on the inner side wall of the channel body (30); the pull rope (7) is movably arranged in the touch-increasing reset channel (31); and the reset spring (8) is telescopically arranged in the touch-increasing reset channel (31).

6. The ammonia injection device for SCR denitrification of catalytic cracking flue gas according to claim 5, characterized in that: An ammonia injection pipe (22) inlet is provided on the bottom wall of the channel body (30), and the ammonia injection pipe (22) is arranged in the channel body (30) through the ammonia injection pipe (22) inlet.

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