A denitrification SCR ammonia injection optimization device

Abstract

The utility model relates to a denitration device, which belongs to the technical field of flue gas denitration, and specifically is a denitration SCR ammonia spray optimization device, comprising a treatment tube, a bottom wall of the treatment tube is fixedly installed with an air outlet tube, a sealing cover is slidably installed inside the treatment tube, an air outlet pipe is slidably penetrated on the side wall of the sealing cover, two guide plates are arranged inside the treatment tube, the top ends of the two guide plates are fixedly installed with a connecting shaft, the inner wall of the treatment tube is fixedly installed with two supporting spring plates, the outer wall of the treatment tube is fixedly installed with two ammonia inlet pipes, the bottom ends of the two supporting spring plates are fixedly installed with a plurality of ammonia spray pipes at equal distances, and the inner wall of the treatment tube is fixedly installed with a diverter plate; according to the utility model, the flue gas is sprayed downward through the gap between the two guide plates, and flows downward along the inclined side walls on the diverter plate under the influence of high pressure, so that the flue gas is evenly distributed on both sides of the diverter plate; the problem of uneven internal flue gas distribution of the existing denitration device is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas denitration, in particular to a denitration SCR ammonia spraying optimization device. Background Art

[0002] In the field of air pollution control, ultra-low emissions have gradually become the emission implementation standard in the power industry, chemical industry, metallurgical industry and other fields. At present, the construction or transformation technology of flue gas denitrification is mature, mainly using SCR denitrification, SNCR denitrification or a combination of the two technologies. For SCR denitrification technology, the control of the amount of ammonia injection is particularly important. If the amount of ammonia injection is too small, the emission of ammonia oxides cannot meet the requirements. Increasing the amount of ammonia injection is beneficial to reducing the emission concentration of ammonia oxides, but ammonia escape will increase accordingly, which will cause subsequent equipment to be blocked and corrode the downstream air preheater.

[0003] After searching, the Chinese patent with publication number CN216173376U discloses an SCR denitration optimization and precise ammonia injection system device, including a main gas pipeline and multiple denitration devices, the upper end of the main gas pipeline is fixedly connected with multiple branch gas pipelines, and the ends of multiple branch gas pipelines away from the main gas pipeline are all extended into the denitration device and fixedly connected with an ammonia injection main pipe, and multiple ammonia injection main pipes are detachably connected with multiple ammonia injection branch pipes through elbow connectors, and multiple ammonia injection main pipes and multiple ammonia injection branch pipes are fixedly provided with multiple ammonia injection nozzles, and multiple ammonia injection main pipes and multiple ammonia injection branch pipes are detachably fixed on the inner wall of the denitration device through mounting buckles. The patent discloses an SCR denitration optimization and precise ammonia injection system device, which adopts a grid-based injection method to effectively distribute ammonia according to partitions to achieve precise ammonia injection, and multiple ammonia injection nozzles are arranged on the ammonia injection main pipe and the ammonia injection branch pipe to make the ammonia injection more uniform, achieve a full mixing reaction of ammonia and flue gas, and achieve better flue gas denitration effect.

[0004] In the above-mentioned prior art solution, a grid-based spraying method is adopted to effectively distribute the amount of ammonia by partition to achieve precise ammonia spraying. However, in actual use, when the flue gas enters the denitrification device through the inlet, since there is a certain space inside the denitrification device, the flue gas will be sprayed near the outlet, causing the flue gas near the outlet of the denitrification device to be more and the position distribution of the flue gas is uneven. Utility Model Content

[0005] In order to solve the above technical problems, the utility model proposes a denitrification SCR ammonia injection optimization device, in which the flue gas is sprayed downward through the gap between the two guide plates, and flows downward along the inclined side wall on the diverter plate under the influence of high pressure, so that the flue gas is evenly distributed on both sides of the diverter plate.

[0006] The technical solution to achieve the purpose of the utility model is: a denitrification SCR ammonia injection optimization device, including a treatment cylinder, a bottom wall of the treatment cylinder is fixedly installed with an air outlet cylinder, a sealing cover is slidably installed inside the treatment cylinder, an air outlet pipe is slidably penetrated on the side wall of the sealing cover, two guide plates are arranged inside the treatment cylinder, the top ends of the two guide plates are fixedly installed with connecting shafts, the connecting shafts are rotatably installed on the inner side wall of the treatment cylinder, two supporting spring plates are fixedly installed on the inner side wall of the treatment cylinder, the adjacent ends of the two supporting spring plates are respectively rotatably connected with the adjacent guide plates, two ammonia inlet pipes are fixedly installed on the outer side wall of the treatment cylinder, a plurality of ammonia injection pipes are equidistantly fixedly installed on the bottom ends of the two supporting spring plates, a diverter plate is fixedly installed on the inner side wall of the treatment cylinder, the diverter plate is in the shape of "∧", the top of the diverter plate is aligned with the bottom ends of the two guide plates that are fitted together, and the bottoms of the two supporting spring plates are respectively aligned with the two inclined outer sides of the diverter plate.

[0007] In some embodiments, the two supporting spring plates are arc-shaped.

[0008] In some embodiments, a partition is fixedly mounted on the top wall of the diverter plate, and the bottom ends of the two guide plates are in contact with a side wall of the partition that is close to the bottom end.

[0009] In certain embodiments, adjacent ends of the two ammonia inlet pipes are respectively connected to the interior of adjacent support spring plates.

[0010] In some embodiments, a fixing frame is fixedly mounted on the top wall of the treatment cylinder, an adjusting motor is fixedly mounted on the top wall of the fixing frame, an adjusting bolt is fixedly mounted on the output shaft of the adjusting motor, and a sealing cover is threadedly mounted on the side wall of the adjusting bolt.

[0011] In some embodiments, a positioning frame is fixedly mounted on the inner side wall of the treatment cylinder, the air outlet pipe is fixedly mounted on the side wall of the positioning frame, and the bottom end of the adjusting bolt is fixedly mounted on the side wall of the positioning frame via a bearing.

[0012] Compared with the prior art, the utility model has the following significant advantages:

[0013] First, the utility model supports the two side walls respectively through two supporting spring plates, so that the bottom ends of the two guide plates fit each other and are located in the center position inside the treatment tube, so that the flue gas entering the interior is at the top of the two guide plates. When the flue gas between the two guide plates becomes more and more, the pressure at the top of the treatment tube becomes larger, and the flue gas will push the bottom ends of the two guide plates to rotate around the connecting shaft to the end away from the flue gas, and the flue gas will be ejected downward through the gap between the two guide plates. The diverter plate is at the bottom end of the two guide plates, so the downward flowing air is divided into two parts by the diverter plate, and flows downward along the inclined side wall of the diverter plate under the influence of high pressure. At this time, the ammonia gas ejected downward through the supporting spring plate is mixed with the flue gas flowing along the side wall of the diverter plate to purify the flue gas, and the amount of flue gas ejected outward is reduced by the influence of high pressure, so that the ammonia gas can be fully mixed with the flue gas, thereby improving the denitrification effect; the problem of uneven internal flue gas distribution of the existing denitrification device is solved.

[0014] Second, the utility model installs the sealing cover threadedly on the side wall of the adjusting bolt. When the output shaft of the adjusting motor drives the adjusting bolt to rotate, the sealing cover can move downward with the rotation of the adjusting bolt, thereby reducing the space at the top of the guide plate, thereby increasing the air pressure at the top of the guide plate and discharging the residual flue gas inside the treatment cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further explained below in conjunction with the accompanying drawings and embodiments:

[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model denitrification SCR ammonia injection optimization device;

[0017] Figure 2 This is a schematic diagram of the internal structure of the treatment cylinder of the utility model;

[0018] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle.

[0019] Description of reference numerals:

[0020] 1. Treatment tube; 2. Air outlet tube; 3. Sealing cover; 4. Air outlet pipe; 5. Fixing frame; 6. Adjusting motor; 7. Adjusting bolt; 8. Positioning frame; 9. Guide plate; 10. Connecting shaft; 11. Diverter plate; 12. Partition plate; 13. Support spring plate; 14. Ammonia spray pipe; 15. Ammonia inlet pipe. DETAILED DESCRIPTION

[0021] The utility model is described in detail below, and the technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0022] The utility model provides a denitration SCR ammonia injection optimization device through improvement. The technical solution of the utility model is:

[0023] like Figure 1-Figure 3 As shown, a denitration SCR ammonia injection optimization device includes a treatment tube 1, a gas outlet tube 2 is fixedly installed on the bottom wall of the treatment tube 1, a sealing cover 3 is slidably installed inside the treatment tube 1, and a gas outlet pipe 4 is slidably penetrated on the side wall of the sealing cover 3, and two guide plates 9 are arranged inside the treatment tube 1, and the tops of the two guide plates 9 are fixedly installed with connecting shafts 10, and the connecting shafts 10 are rotatably installed on the inner side wall of the treatment tube 1, and two supporting spring plates 13 are fixedly installed on the inner side wall of the treatment tube 1, and the two supporting spring plates 13 are arc-shaped, and the two supporting spring plates 13 are close to each other. The ends are rotatably connected with the adjacent guide plates 9 respectively, two ammonia inlet pipes 15 are fixedly installed on the outer wall of the treatment cylinder 1, and the adjacent ends of the two ammonia inlet pipes 15 are respectively communicated with the inside of the adjacent support spring plates 13, and the bottom ends of the two support spring plates 13 are fixedly installed with multiple ammonia spraying pipes 14 at equal intervals, and the inner wall of the treatment cylinder 1 is fixedly installed with a diverter plate 11, and the diverter plate 11 is in the shape of "∧", and the top of the diverter plate 11 is aligned with the bottom ends of the two guide plates 9 that are fitted together, and the bottoms of the two support spring plates 13 are respectively aligned with the two inclined outer walls on the diverter plate 11; The external flue gas is input into the treatment tube 1 by connecting the air outlet pipe 4 to the output end of the external flue gas, and then the ammonia inlet pipe 15 is connected to the external ammonia output end, and the ammonia is injected into the support spring plate 13, and finally sprayed downward through the ammonia spray pipe 14. Since the two support spring plates 13 support the two side walls respectively, the bottom ends of the two guide plates 9 are fitted to each other and are located in the center of the treatment tube 1, so that the flue gas entering the interior is at the top of the two guide plates 9. When the flue gas between the two guide plates 9 increases, the pressure at the top of the treatment tube 1 increases. The smoke will therefore push the bottom ends of the two guide plates 9 to rotate toward the ends away from each other around the connecting shaft 10, and the smoke will be ejected downward through the gap between the two guide plates 9. The diverter plate 11 is located at the bottom ends of the two guide plates 9, so the downwardly flowing air is divided into two parts by the diverter plate 11, and flows downward along the inclined side wall of the diverter plate 11 under the influence of high pressure. At this time, the ammonia gas ejected downward through the supporting spring plate 13 is mixed with the smoke flowing along the side wall of the diverter plate 11 to purify the smoke, and the purified smoke is discharged outward through the air outlet pipe 2.

[0024] like Figure 2 As shown, in one embodiment, in order to increase the air pressure at the top of the guide plate 9, a fixing frame 5 is fixedly installed on the top wall of the treatment tube 1, an adjusting motor 6 is fixedly installed on the top wall of the fixing frame 5, an adjusting bolt 7 is fixedly installed on the output shaft of the adjusting motor 6, and a sealing cover 3 is threadedly installed on the side wall of the adjusting bolt 7; by threading the sealing cover 3 on the side wall of the adjusting bolt 7, when the output shaft of the adjusting motor 6 drives the adjusting bolt 7 to rotate, the sealing cover 3 can move downward with the rotation of the adjusting bolt 7, thereby reducing the space at the top of the guide plate 9, thereby increasing the air pressure at the top of the guide plate 9, and discharging the residual flue gas inside the treatment tube 1.

[0025] like Figure 2 As shown, in one embodiment, in order to ensure the stable position of the air outlet pipe 4, a positioning frame 8 is fixedly installed on the inner wall of the processing cylinder 1, the air outlet pipe 4 is fixedly installed on the side wall of the positioning frame 8, and the bottom end of the adjusting bolt 7 is fixedly installed on the side wall of the positioning frame 8 through a bearing; the air outlet pipe 4 is fixed by the positioning frame 8 to ensure the stable position of the air outlet pipe 4, and at the same time, the adjusting bolt 7 is rotatably installed inside the positioning frame 8 through the bearing, so that the positioning frame 8 can limit the bottom end of the adjusting bolt 7 to ensure the stability of the bottom end of the adjusting bolt 7.

[0026] like Figure 2 As shown, in one embodiment, in order to facilitate the smoke to flow along the side wall of the diverter plate 11, a partition 12 is fixedly installed on the top wall of the diverter plate 11, and the bottom ends of the two guide plates 9 are in contact with the side wall of the partition 12; by using the partition 12 for partial isolation, the smoke flowing out through the bottom end of the guide plate 9 will not flow to the other side wall of the diverter plate 11, thereby avoiding the occurrence of chaotic smoke flow on both sides of the diverter plate 11.

[0027] The specific working method is: by connecting the exhaust pipe 4 with the output end of the external flue gas, the external flue gas is input into the interior of the treatment tube 1, and then the ammonia inlet pipe 15 is connected with the external ammonia output end, the ammonia is injected into the interior of the support spring plate 13, and finally sprayed downward through the ammonia spray pipe 14. Since the two support spring plates 13 support the two side walls respectively, the bottom ends of the two guide plates 9 are fitted to each other and are located at the center position inside the treatment tube 1, so that the flue gas entering the interior is at the top of the two guide plates 9. When the flue gas between the two guide plates 9 becomes more and more, the pressure at the top of the interior of the treatment tube 1 becomes larger, and the flue gas will therefore push the bottom ends of the two guide plates 9 to rotate around the connecting shaft 10 to the end away from each other, and the flue gas passes through the gap between the two guide plates 9. It is sprayed downward, and the diverter plate 11 is at the bottom of the two guide plates 9, so the downwardly flowing air is divided into two parts by the diverter plate 11, and flows downward along the inclined side wall of the diverter plate 11 under the influence of high pressure. At this time, the ammonia sprayed downward through the supporting spring plate 13 is mixed with the flue gas flowing along the side wall of the diverter plate 11 to purify the flue gas, and the purified flue gas is discharged outward through the air outlet tube 2; finally, by threading the sealing cover 3 on the side wall of the adjusting bolt 7, when the output shaft of the adjusting motor 6 drives the adjusting bolt 7 to rotate, the sealing cover 3 can move downward with the rotation of the adjusting bolt 7, thereby reducing the space at the top of the guide plate 9, thereby increasing the air pressure at the top of the guide plate 9, and discharging the residual flue gas inside the treatment tube 1.

[0028] The technical means disclosed in the utility model are not limited to the technical means disclosed in the above technical means, but also include technical solutions composed of equivalent replacement of the above technical features. Matters not covered in the utility model belong to the common knowledge of those skilled in the art.

Claims

1. A denitration SCR ammonia injection optimization device, comprising a treatment tube (1), a gas outlet tube (2) being fixedly mounted on the bottom wall of the treatment tube (1), characterized in that: A sealing cover (3) is slidably mounted inside the treatment cylinder (1), and an air outlet pipe (4) is slidably penetrated on the side wall of the sealing cover (3). Two guide plates (9) are arranged inside the treatment cylinder (1), and a connecting shaft (10) is fixedly mounted on the top of each of the two guide plates (9). The connecting shaft (10) is rotatably mounted on the inner side wall of the treatment cylinder (1). Two supporting spring plates (13) are fixedly mounted on the inner side wall of the treatment cylinder (1), and the adjacent ends of the two supporting spring plates (13) are respectively connected to the adjacent guide plates. (9) are rotatably connected together, two ammonia inlet pipes (15) are fixedly installed on the outer wall of the treatment cylinder (1), and a plurality of ammonia injection pipes (14) are fixedly installed at the bottom ends of the two supporting spring plates (13) at equal intervals, and a diverter plate (11) is fixedly installed on the inner wall of the treatment cylinder (1), and the diverter plate (11) is in the shape of a "∧" character, and the top end of the diverter plate (11) is aligned with the bottom ends of the two guide plates (9) that are in contact with each other, and the bottoms of the two supporting spring plates (13) are respectively aligned with the two inclined outer walls on the diverter plate (11).

2. A denitration SCR ammonia injection optimization device according to claim 1, characterized in that: The two supporting spring plates (13) are in an arc shape.

3. A denitration SCR ammonia injection optimization device according to claim 1, characterized in that: A partition plate (12) is fixedly mounted on the top wall surface of the diverter plate (11), and the bottom ends of the two guide plates (9) are in contact with a side wall surface of the partition plate (12) that is close to the bottom wall.

4. A denitration SCR ammonia injection optimization device according to claim 1, characterized in that: The adjacent ends of the two ammonia inlet pipes (15) are respectively communicated with the interior of the adjacent supporting spring plates (13).

5. A denitration SCR ammonia injection optimization device according to claim 1, characterized in that: A fixing frame (5) is fixedly mounted on the top wall of the treatment cylinder (1), an adjusting motor (6) is fixedly mounted on the top wall of the fixing frame (5), an adjusting bolt (7) is fixedly mounted on the output shaft of the adjusting motor (6), and a sealing cover (3) is threadedly mounted on the side wall of the adjusting bolt (7).

6. A denitration SCR ammonia injection optimization device according to claim 5, characterized in that: A positioning frame (8) is fixedly mounted on the inner side wall of the treatment cylinder (1), the air outlet pipe (4) is fixedly mounted on the side wall of the positioning frame (8), and the bottom end of the adjusting bolt (7) is fixedly mounted on the side wall of the positioning frame (8) via a bearing.

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