Diversion type SCR (Selective Catalytic Reduction) flue gas denitration device

Abstract

The utility model relates to a diversion type SCR (Selective Catalytic Reduction) flue gas denitration device, which belongs to the technical field of boiler flue gas purification equipment and comprises a support rod, a conical diversion body and an ammonia spraying assembly, the flow guide body is fixed on the supporting rod; a spirally extending flow guide groove is formed in the side surface of the flow guide body; the ammonia spraying assembly comprises a plurality of ammonia spraying pipes and an ammonia storage tank, the ammonia spraying pipes are fixed on the supporting rod corresponding to the two sides of the flow guide body, and a plurality of ammonia spraying holes are formed in the pipe walls of the ammonia spraying pipes; and the ammonia storage tank is communicated with a plurality of ammonia spraying pipes. The conical flow guide body is fixed in the smoke exhaust pipe through the supporting rod in the smoke exhaust direction of the smoke exhaust pipe, the ammonia spraying pipes are distributed on the two sides of the flow guide body, and the ammonia spraying holes are formed in the pipe walls, close to the side faces of the flow guide body, of the ammonia spraying pipes, so that when high-temperature smoke introduced into the smoke exhaust pipe passes through the flow guide body, the flow guide body can evenly scatter the high-temperature smoke, and the smoke exhaust efficiency is improved. And the flow guide groove is used for guiding the flowing direction of the high-temperature flue gas, so that the denitration efficiency and the denitration effect of the SCR flue gas are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler flue gas purification equipment, in particular to a flow-guiding SCR flue gas denitration device. Background Art

[0002] Many research institutions have developed denitration systems that can efficiently remove nitrogen oxides from flue gas, but most denitration systems still have problems such as uneven mixing of ammonia water and flue gas, low ammonia water utilization rate leading to ammonia escape, complex systems, and difficulty in widespread application. Patent CN216726662U discloses "a flue gas denitration system ammonia spraying grid", which evenly arranges multiple ammonia spraying branches in the cross section of the flue, and evenly arranges ammonia spraying nozzles on the branches to ensure the uniformity of ammonia spraying. In addition, the system is also provided with a purge device to prevent uneven ammonia spraying caused by blockage of some denitration ammonia spraying nozzles, thereby ensuring the normal operation of the denitration system. However, it does not take into account the problem of uneven distribution of flue gas entering the flue, making it difficult to ensure uniform mixing of ammonia water and flue gas, which seriously affects the denitrification efficiency of the denitrification system; Patent CN214809863U discloses "an ammonia spray grid of an SCR denitrification system", which drives a rotating rod inside the device through a motor to stir the flue gas entering the device evenly, and evenly arranges ammonia spray nozzles around the rotating rod to achieve uniform mixing of flue gas and ammonia water, thereby improving the denitrification efficiency of the denitrification system. However, the system requires a motor to drive it, resulting in energy waste. In addition, the system is too complicated to be used in larger-scale industrial boilers, and is difficult to repair when a failure occurs.

[0003] Therefore, how to design an SCR flue gas denitrification device with high denitrification efficiency and an ammonia nozzle that is not easily clogged is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0004] The utility model provides a flow-guiding SCR flue gas denitration device, which solves the technical problems of uneven mixing of flue gas and ammonia gas, low denitration efficiency and easy clogging of ammonia spray nozzles in the existing SCR denitration system.

[0005] The utility model solves the above technical problems with the following technical solutions: a flow-guiding SCR flue gas denitrification device, comprising: a smoke exhaust pipe, a first waste heat recovery device, a grille, a catalyst, and a second waste heat recovery device; the smoke inlet of the smoke exhaust pipe is connected to the smoke exhaust hole of the boiler; the first waste heat recovery device, the grille, the catalyst, and the second waste heat recovery device are fixed in the smoke exhaust pipe in sequence along the smoke exhaust direction of the smoke exhaust pipe; and further comprising: a support rod, a conical guide body, and an ammonia spraying assembly,

[0006] The support rod is located between the first waste heat recovery device and the grille and is fixed inside the smoke exhaust pipe along a smoke exhaust direction perpendicular to the smoke exhaust pipe; the guide body is located inside the smoke exhaust pipe and is fixed on the support rod along the smoke exhaust direction of the smoke exhaust pipe, the small diameter end of the guide body is close to the first waste heat recovery device and a guide groove extending spirally along the smoke exhaust direction of the smoke exhaust pipe is provided on its side; the ammonia injection assembly includes a plurality of ammonia injection pipes and an ammonia storage tank, the plurality of ammonia injection pipes are placed in the smoke exhaust pipe along the smoke exhaust direction of the smoke exhaust pipe and are fixed on the support rod at both sides of the corresponding guide body, and the pipe walls of the plurality of ammonia injection pipes are provided with a plurality of ammonia injection holes that are opposite to the side of the guide body; the ammonia storage tank is located outside the smoke exhaust pipe and penetrates into the smoke exhaust pipe through an ammonia pipe to communicate with the plurality of ammonia injection pipes.

[0007] The beneficial effect of the utility model is as follows: the conical guide body is fixed in the smoke exhaust pipe along the smoke exhaust direction of the smoke exhaust pipe by using the support rod; since a plurality of ammonia injection pipes are distributed on both sides of the guide body and a plurality of ammonia injection holes are provided on the pipe wall close to the side of the guide body, when the high-temperature flue gas entering the smoke exhaust pipe passes through the guide body, the guide body will evenly disperse the high-temperature flue gas; at the same time, the guide grooves spirally extending on the side of the guide body along the smoke exhaust direction of the smoke exhaust pipe will guide the flow direction of the high-temperature flue gas, thereby prolonging the contact time and contact area between the high-temperature flue gas and ammonia water, and greatly improving the denitrification efficiency and denitrification effect of the SCR flue gas.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, it also includes a plurality of partitions, the number of the body guides is plural, the plurality of the partitions are all placed in the smoke exhaust pipe along the smoke exhaust direction of the smoke exhaust pipe, and are fixed on the support rod at intervals along the length direction of the support rod, and define a plurality of smoke exhaust channels inside the smoke exhaust pipe; the plurality of body guides are respectively placed in the plurality of smoke exhaust channels; and the plurality of ammonia injection pipes are placed in the plurality of smoke exhaust channels corresponding to the two sides of the plurality of body guides.

[0010] A further beneficial effect of adopting the above method is that by installing multiple partitions in the smoke exhaust pipe, the interior of the smoke exhaust pipe can be divided into multiple smoke exhaust channels. Since multiple guide bodies and multiple ammonia injection pipes are respectively placed in multiple smoke exhaust channels, the dispersion effect of high-temperature flue gas can be improved, the residence time of high-temperature flue gas can be extended, and the denitrification efficiency and denitrification effect of SCR flue gas can be improved.

[0011] Furthermore, the ammonia injection assembly also includes a plurality of ammonia injection nozzles, and the plurality of ammonia injection nozzles are respectively fixed on and connected to the plurality of ammonia injection holes.

[0012] Furthermore, the plurality of ammonia spray nozzles are arranged at an angle and their inclination direction is perpendicular to the adjacent side surface of the guide body.

[0013] A further beneficial effect of adopting the above method is that the multiple ammonia spray nozzles are arranged toward the side of the guide body, which can prevent particulate matter in the high-temperature flue gas from entering the ammonia spray nozzles and reduce the risk of clogging of the ammonia spray nozzles.

[0014] Furthermore, it also includes a purge component, which includes an air jet pipe and an air storage tank. The air jet pipe is located between the first waste heat recovery device and the guide body and is fixed in the smoke exhaust pipe along a smoke exhaust direction perpendicular to the smoke exhaust pipe. The pipe wall of the air jet pipe is provided with a plurality of air jet holes that are opposite to the plurality of ammonia spray nozzles. The air storage tank is located outside the smoke exhaust pipe and is connected to the air jet pipe by penetrating the smoke exhaust pipe through a compressed air pipe.

[0015] A further beneficial effect of the above method is that the jet holes on the jet pipe are all opposite to the multiple ammonia spray nozzles, so the ammonia spray nozzles can be cleaned in time to avoid clogging of the ammonia spray nozzles.

[0016] Furthermore, it also includes a compressed air valve, which is installed on the compressed air pipe.

[0017] Furthermore, it also includes an ammonia valve, which is installed on the ammonia pipe.

[0018] Furthermore, it also includes a first SCR smoke content sensor and a second SCR smoke content sensor, the first SCR smoke content sensor is fixed on the inner tube wall of the exhaust pipe corresponding to the first waste heat recovery device and the guide body; the second SCR smoke content sensor is fixed on the inner tube wall of the exhaust pipe corresponding to the catalyst and the second waste heat recovery device.

[0019] The further beneficial effect of adopting the above method is: first use the first SCR flue gas content sensor to detect the nitrogen oxide content of the high-temperature flue gas before treatment, and then use the second SCR flue gas content sensor to detect the nitrogen oxide content after treatment, and finally compare the two sets of detection data to obtain the denitrification efficiency and denitrification effect of the SCR flue gas denitrification device in real time.

[0020] Furthermore, the guide groove has a width of 10-30 mm and a depth of 15-40 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the internal structure of a flow-guiding SCR flue gas denitrification device of the utility model;

[0022] Figure 2 for Figure 1 A local enlarged structural diagram;

[0023] Figure 3It is a front view structural schematic diagram of a flow guide body in a flow guide type SCR flue gas denitration device of the utility model.

[0024] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0025] 1. Support rod, 2. Guide body, 21. Guide groove, 3. Ammonia spray assembly, 31. Ammonia spray pipe, 311. Ammonia spray hole, 32. Ammonia storage tank, 33. Ammonia spray nozzle, 4. Exhaust pipe, 5. First waste heat recovery device, 6. Grille, 7. Catalyst, 8. Second waste heat recovery device, 9. Boiler, 10. Jet pipe, 101. Jet hole, 11. Gas storage tank, 12. Compressed air valve, 13. Ammonia valve, 14. First SCR flue gas content sensor, 15. Second SCR flue gas content sensor, 16. Partition. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0027] like Figure 1 As shown, a flow-guiding SCR flue gas denitrification device comprises: a smoke exhaust pipe 4, a first waste heat recovery device 5, a grille 6, a catalyst 7 and a second waste heat recovery device 8, the smoke inlet of the smoke exhaust pipe 4 is connected to the smoke exhaust hole of the boiler 9; the first waste heat recovery device 5, the grille 6, the catalyst 7 and the second waste heat recovery device 8 are fixed in the smoke exhaust pipe 4 in sequence along the smoke exhaust direction of the smoke exhaust pipe 4;

[0028] The invention also includes: a support rod 1, a conical guide body 2 and an ammonia injection assembly 3, wherein the support rod 1 is located between the first waste heat recovery device 5 and the grille 6 and is fixed inside the smoke exhaust pipe 4 along the smoke exhaust direction of the vertical smoke exhaust pipe 4; the guide body 2 is located inside the smoke exhaust pipe 4 and is fixed on the support rod 1 along the smoke exhaust direction of the smoke exhaust pipe 4, the small diameter end of the guide body 2 is close to the first waste heat recovery device 5 and a guide groove 21 extending spirally along the smoke exhaust direction of the smoke exhaust pipe 4 is provided on its side; the ammonia injection assembly 3 includes a plurality of ammonia injection pipes 31 and an ammonia storage tank 32, the plurality of ammonia injection pipes 31 are all placed in the smoke exhaust pipe 4 along the smoke exhaust direction of the smoke exhaust pipe 4 and are fixed on the support rod 1 on both sides of the corresponding guide body 2, and a plurality of ammonia injection holes 3 are provided on the pipe walls of the plurality of ammonia injection pipes 31, which are all opposite to the side of the guide body 2 11; the ammonia storage tank 32 is located outside the smoke exhaust pipe 4 and penetrates into the smoke exhaust pipe 4 through the ammonia pipe to communicate with multiple ammonia injection pipes 31; in the above structure, the conical guide body 2 is fixed in the smoke exhaust pipe 4 along the smoke exhaust direction of the smoke exhaust pipe 4 by the support rod 1. Since the multiple ammonia injection pipes 31 are distributed on both sides of the guide body 2 and multiple ammonia injection holes 311 are provided on the pipe wall close to the side of the guide body 2, when the high-temperature flue gas entering the smoke exhaust pipe 4 passes through the guide body 2, the guide body 2 will evenly disperse the high-temperature flue gas. At the same time, the guide groove 21 spirally extending along the smoke exhaust direction of the smoke exhaust pipe 4 on the side of the guide body 2 will guide the flow direction of the high-temperature flue gas, prolong the contact time and contact area between the high-temperature flue gas and ammonia water, and greatly improve the denitrification efficiency and denitrification effect of the SCR flue gas.

[0029] In some specific embodiments, multiple partitions 16 may be included, there are multiple flow guides 2, and the multiple partitions 16 are placed in the smoke exhaust pipe 4 along the smoke exhaust direction of the smoke exhaust pipe 4, and are fixed on the support rod 1 at intervals along the length direction of the support rod 1, and define multiple smoke exhaust channels inside the smoke exhaust pipe 4; multiple flow guides 2 are respectively placed in the multiple smoke exhaust channels; and multiple ammonia injection pipes 31 are placed in the multiple smoke exhaust channels corresponding to the two sides of the multiple flow guides 2.

[0030] In some specific embodiments, the ammonia injection assembly 3 may further include a plurality of ammonia injection nozzles 33 , and the plurality of ammonia injection nozzles 33 are respectively fixed to and connected to the plurality of ammonia injection holes 311 .

[0031] In some specific embodiments, the plurality of ammonia spray nozzles 33 are arranged obliquely and their inclination directions are perpendicular to the side surfaces of the adjacent flow guide bodies 2 .

[0032] In some specific embodiments, a purge assembly may also be included, which includes an air jet pipe 10 and an air storage tank 11. The air jet pipe 10 is located between the first waste heat recovery device 5 and the guide body 2 and is fixed in the smoke exhaust pipe 4 along the smoke exhaust direction of the vertical smoke exhaust pipe 4. A plurality of air jet holes 101 are provided on the pipe wall of the air jet pipe 10, each of which is opposite to the plurality of ammonia spray nozzles 33; the air storage tank 11 is located outside the smoke exhaust pipe 4 and is connected to the air jet pipe 10 by penetrating into the smoke exhaust pipe 4 through a compressed air pipe.

[0033] In some specific embodiments, a compressed air valve 12 may be further included, and the compressed air valve 12 is installed on the compressed air pipe.

[0034] In some specific embodiments, an ammonia valve 13 may also be included, and the ammonia valve 13 is installed on the ammonia pipe.

[0035] In some specific embodiments, a first SCR flue gas content sensor 14 and a second SCR flue gas content sensor 15 may also be included. The first SCR flue gas content sensor 14 is fixed on the inner tube wall of the exhaust pipe 4 corresponding to the first waste heat recovery device 5 and the guide body 2; the second SCR flue gas content sensor 15 is fixed on the inner tube wall of the exhaust pipe 4 corresponding to the catalyst 7 and the second waste heat recovery device 8.

[0036] In some specific embodiments, the width of the guide groove 21 may be 10-30 mm, and the depth may be 15-40 mm.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flow-guiding SCR flue gas denitrification device, comprising: A smoke exhaust pipe (4), a first waste heat recovery device (5), a grille (6), a catalyst (7) and a second waste heat recovery device (8), wherein the smoke inlet of the smoke exhaust pipe (4) is connected to the smoke exhaust hole of the boiler (9); the first waste heat recovery device (5), the grille (6), the catalyst (7) and the second waste heat recovery device (8) are fixed in sequence in the smoke exhaust pipe (4) along the smoke exhaust direction of the smoke exhaust pipe (4); characterized in that it also includes: A support rod (1), the support rod (1) being located between the first waste heat recovery device (5) and the grille (6) and being fixed inside the smoke exhaust pipe (4) in a direction perpendicular to the smoke exhaust direction of the smoke exhaust pipe (4); a conical guide body (2), the guide body (2) being located inside the smoke exhaust pipe (4) and fixed on the support rod (1) along the smoke exhaust direction of the smoke exhaust pipe (4); the small diameter end of the guide body (2) being close to the first waste heat recovery device (5) and having a guide groove (21) on its side extending spirally along the smoke exhaust direction of the smoke exhaust pipe (4); An ammonia spraying assembly (3), the ammonia spraying assembly (3) comprising a plurality of ammonia spraying pipes (31) and an ammonia storage tank (32), the plurality of ammonia spraying pipes (31) being arranged in the smoke exhausting pipe (4) along the smoke exhausting direction of the smoke exhausting pipe (4) and being fixed on the support rod (1) at two sides corresponding to the body guide (2), and a plurality of ammonia spraying holes (311) being arranged on the pipe walls of the plurality of ammonia spraying pipes (31) and being opposite to the side surfaces of the body guide (2); the ammonia storage tank (32) being located outside the smoke exhausting pipe (4) and penetrating into the smoke exhausting pipe (4) through an ammonia pipe to be connected with the plurality of ammonia spraying pipes (31).

2. A flow-guiding SCR flue gas denitration device according to claim 1, characterized in that: It also comprises a plurality of partitions (16), the plurality of guide bodies (2), the plurality of partitions (16) are all placed in the smoke exhaust pipe (4) along the smoke exhaust direction of the smoke exhaust pipe (4), and are fixed to the support rod (1) at intervals along the length direction of the support rod (1), and define a plurality of smoke exhaust channels inside the smoke exhaust pipe (4); the plurality of guide bodies (2) are respectively placed in the plurality of smoke exhaust channels; and the plurality of ammonia injection pipes (31) are placed in the plurality of smoke exhaust channels corresponding to both sides of the plurality of guide bodies (2).

3. A flow-guiding SCR flue gas denitration device according to claim 1, characterized in that: The ammonia spraying assembly (3) further comprises a plurality of ammonia spraying nozzles (33), wherein the plurality of ammonia spraying nozzles (33) are respectively fixed to and connected to the plurality of ammonia spraying holes (311).

4. A flow-guiding SCR flue gas denitration device according to claim 3, characterized in that: The plurality of ammonia spray nozzles (33) are all arranged obliquely, and their inclination direction is perpendicular to the adjacent side surface of the guide body (2).

5. A flow-guiding SCR flue gas denitration device according to claim 3, characterized in that: The invention also comprises a purge assembly, the purge assembly comprising an air jet pipe (10) and an air storage tank (11); the air jet pipe (10) is located between the first waste heat recovery device (5) and the flow guide (2) and is fixed in the smoke exhaust pipe (4) along a smoke exhaust direction perpendicular to the smoke exhaust pipe (4); a plurality of air jet holes (101) are provided on the pipe wall of the air jet pipe (10), each of which is opposite to the plurality of ammonia spray nozzles (33); the air storage tank (11) is located outside the smoke exhaust pipe (4) and is connected to the air jet pipe (10) by penetrating into the smoke exhaust pipe (4) through a compressed air pipe.

6. A flow-guiding SCR flue gas denitration device according to claim 5, characterized in that: It also comprises a compressed air valve (12), wherein the compressed air valve (12) is installed on the compressed air pipe.

7. The flow-guiding SCR flue gas denitrification device according to claim 1, characterized in that: It also includes an ammonia valve (13), which is installed on the ammonia pipe.

8. The flow-guiding SCR flue gas denitration device according to claim 1, characterized in that: It also includes a first SCR smoke content sensor (14) and a second SCR smoke content sensor (15), wherein the first SCR smoke content sensor (14) is fixed on the inner tube wall of the exhaust pipe (4) corresponding to the first waste heat recovery device (5) and the guide body (2); and the second SCR smoke content sensor (15) is fixed on the inner tube wall of the exhaust pipe (4) corresponding to the catalyst (7) and the second waste heat recovery device (8).

9. The flow-guiding SCR flue gas denitrification device according to claim 1, characterized in that: The guide groove (21) has a width of 10-30 mm and a depth of 15-40 mm.

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