SCR (Selective Catalytic Reduction) denitration device of thermal power generating unit

Abstract

The utility model discloses a thermal power generating unit SCR (Selective Catalytic Reduction) denitration device, which relates to the technical field of SCR denitration, and comprises a denitration tower, a rear opening is formed in the rear surface of the denitration tower in a penetrating manner, a cleaning mechanism is arranged on the rear side of the denitration tower, and the cleaning mechanism comprises a cleaning assembly which can penetrate through the rear opening to enter the denitration tower and is used for cleaning the denitration tower. The cleaning assembly comprises a water tank, and the outer surface of the water tank can be tightly attached to the inner wall of the rear opening and freely slide. According to the SCR denitration device of the thermal power generating unit, the motor drives the gear to be meshed with the rack to drive the water tank to enter the denitration tower, the interior of the denitration tower is divided into an upper part and a lower part after the water tank enters the denitration tower, then water is injected into the water tank till the water level completely overflows out of the water tank and covers a catalyst, and then the water in the water tank is vibrated through the ultrasonic generator; automatic cleaning operation is achieved, manual cleaning is not needed, and time and labor cost are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of SCR denitration, in particular to an SCR denitration device for a thermal power unit. Background Art

[0002] During the operation of thermal power units, a large amount of nitrogen oxides will be produced. If these nitrogen oxides are directly discharged into the atmosphere, they will cause serious pollution to the environment. At present, selective catalytic reduction (SCR) denitrification technology is a denitrification technology widely used in thermal power units.

[0003] In the prior art, for example, publication number CN221846690U discloses an SCR denitrification device, which includes an SCR denitrification tower, a supporting plate, a catalyst, a rear fixing plate, a front fixing plate, and an ammonia pipe. The front surface of the SCR denitrification tower is provided with a through-hole, the upper surface of the supporting plate is provided with a placement groove, and the catalyst is located inside the placement groove. Threaded holes are symmetrically provided at the middle positions of the front and rear surfaces of the supporting plate. Bolt holes are provided at the middle positions of the front surface of the front fixing plate and the rear surface of the rear fixing plate, and screws are movably inserted into the two bolt holes. Plugs are symmetrically fixedly connected at positions on both sides of the rear surface of the front fixing plate and the supporting plate, and jacks are symmetrically provided at both sides of the front surface of the rear fixing plate and the supporting plate. This facilitates the replacement and installation of the catalyst inside the SCR denitrification tower, improves work efficiency, and also greatly reduces the downtime of the SCR denitrification tower.

[0004] In the above patent, although the device facilitates the replacement and installation of the catalyst inside the SCR denitrification tower, the existing technology does not have an automatic cleaning function for the catalyst. The traditional cleaning method usually requires shutdown for manual cleaning, which is time-consuming and labor-intensive. Therefore, the present utility model provides an SCR denitrification device for a thermal power unit. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the utility model provides an SCR denitrification device for a thermal power plant, which solves the problem that the existing technology has no automatic cleaning function for the catalyst and the traditional cleaning method usually requires shutdown for manual cleaning, which is time-consuming and labor-intensive.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an SCR denitrification device for a thermal power plant, comprising a denitrification tower, a rear opening being formed through the rear surface of the denitrification tower, and a cleaning mechanism being provided on the rear side of the denitrification tower, the cleaning mechanism comprising:

[0007] A cleaning assembly can pass through the rear opening to enter the interior of the denitrification tower. The cleaning assembly includes a water tank. The outer surface of the water tank can slide freely against the inner wall of the rear opening. An ultrasonic generator is provided at the bottom of the water tank. The rear surface of the water tank is fixedly connected to a water inlet pipe. The end of the water inlet pipe is fixedly connected to a hose. A drain pipe is fixedly connected to the rear surface of the water tank away from the water inlet pipe.

[0008] The driving assembly is used to drive the cleaning assembly to move forward and backward.

[0009] Preferably, the bottom of the denitrification tower is fixedly connected to a smoke inlet pipe, the top of the denitrification tower is fixedly connected to a smoke outlet pipe, an ammonia inlet pipe is penetrated through the front surface of the smoke inlet pipe, the output end of the ammonia inlet pipe is placed inside the denitrification tower, and the input end of the ammonia inlet pipe is connected to an external ammonia storage tank.

[0010] Preferably, the inner wall of the denitrification tower is fixedly connected to a support frame at the top surface of the rear opening, the front surface of the denitrification tower is penetrated by a front opening at the top surface of the support frame, a placement frame is provided inside the denitrification tower, the placement frame can slide freely close to the inner wall of the front opening, the bottom surface of the placement frame is in contact with the top surface of the support frame, a catalyst is provided inside the placement frame, and a fixing plate for limiting the placement frame is installed on the front surface of the denitrification tower by bolts.

[0011] Preferably, two supporting plates for supporting the water tank are installed on the rear surface of the denitrification tower, and an L-shaped limiting plate for limiting the moving position of the water tank is installed on the top surface of the supporting plate.

[0012] Preferably, the drive assembly includes a mounting plate mounted on the rear surface of the water tank, a motor is mounted on the bottom surface of the mounting plate, a gear is mounted on the output end of the motor, a rack is meshed and connected to the outer surface of the gear, and the rack is mounted on the bottom surface of one of the supporting plates.

[0013] Preferably, a cover plate is installed on the rear surface of the denitrification tower by bolts, and the bottom surface of the cover plate contacts the top surface of the water tank. Two support plates for supporting the water tank are installed at the bottom surface of the rear opening inside the denitrification tower.

[0014] Beneficial effects

[0015] The utility model provides an SCR denitrification device for thermal power generation units. Compared with the existing technology, it has the following beneficial effects:

[0016] (1) The SCR denitrification device of the thermal power unit drives the water tank into the denitrification tower through the engagement of the gear and the rack driven by the motor. After the water tank enters the denitrification tower, the interior is separated into two parts, the upper and lower parts. Then water is poured into the water tank until the water level completely overflows the water tank and covers the catalyst. Then, an ultrasonic generator is used to vibrate the water in the water tank to achieve automatic cleaning operation. No manual cleaning is required, saving time and labor costs.

[0017] (2) The SCR denitrification device of the thermal power unit facilitates the removal and installation of the placement frame through the front opening on the front surface of the denitrification tower. When the catalyst needs to be replaced, the placement frame can be removed from the denitrification tower for replacement by removing the fixing plate. The operation is simple and convenient, which reduces the maintenance cost. In addition, the cover plate is mainly used to tightly cover the top of the water tank when it is outside, effectively preventing dust from falling into the water tank and ensuring the cleanliness of the inside of the water tank. At the same time, the cover plate is installed on the rear surface of the denitrification tower by bolts. This installation method is convenient for disassembly and assembly, and is convenient for cleaning the inside of the water tank and maintaining the ultrasonic generator in the later stage, which greatly improves the convenience and maintainability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional appearance of the utility model;

[0019] Figure 2 This is a cross-sectional view of the denitrification tower of the present utility model;

[0020] Figure 3 This is a schematic diagram of the three-dimensional appearance of the placement frame of the utility model;

[0021] Figure 4 This is a schematic diagram of the three-dimensional appearance of the cleaning component and the driving component of the present invention.

[0022] In the figure: 1. Denitrification tower; 11. Smoke inlet pipe; 12. Smoke outlet pipe; 13. Front opening; 14. Rear opening; 15. Support frame; 16. Support plate; 17. Fixing plate; 2. Ammonia inlet pipe; 3. Placement frame; 31. Catalyst; 4. Loading plate; 5. Cleaning assembly; 51. Water tank; 52. Ultrasonic generator; 53. Water inlet pipe; 54. Hose; 55. Drain pipe; 6. Drive assembly; 61. Mounting plate; 62. Motor; 63. Gear; 64. Rack; 7. L-shaped limit plate; 8. Cover plate. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] This utility model provides two technical solutions:

[0025] Figures 1-4The first embodiment is shown: an SCR denitration device for a thermal power plant, comprising a denitration tower 1, a rear opening 14 being formed through the rear surface of the denitration tower 1, and a cleaning mechanism being provided on the rear side of the denitration tower 1, the cleaning mechanism comprising:

[0026] The cleaning assembly 5 can pass through the rear opening 14 to enter the interior of the denitrification tower 1. The cleaning assembly 5 includes a water tank 51. The outer surface of the water tank 51 can slide freely against the inner wall of the rear opening 14. An ultrasonic generator 52 is provided at the bottom of the water tank 51. The rear surface of the water tank 51 is fixedly connected to a water inlet pipe 53. The end of the water inlet pipe 53 is fixedly connected to a hose 54. The rear surface of the water tank 51 is fixedly connected to a drain pipe 55 away from the water inlet pipe 53.

[0027] The driving assembly 6 is used to drive the cleaning assembly 5 to move forward and backward.

[0028] A smoke inlet pipe 11 is fixedly connected to the bottom of the denitrification tower 1, and a smoke outlet pipe 12 is fixedly connected to the top of the denitrification tower 1. An ammonia inlet pipe 2 is penetrated on the front surface of the smoke inlet pipe 11. The output end of the ammonia inlet pipe 2 is placed inside the denitrification tower 1, and the input end of the ammonia inlet pipe 2 is connected to an external ammonia storage tank. The flue gas enters the denitrification tower 1 through the smoke inlet pipe 11 at the bottom of the denitrification tower 1. At the same time, the ammonia in the external ammonia storage tank is input into the denitrification tower 1 through the ammonia inlet pipe 2. The flue gas and ammonia react under the action of the catalyst 31 in the denitrification tower 1, and the treated flue gas is discharged from the smoke outlet pipe 12 at the top of the denitrification tower 1.

[0029] Two supporting plates 4 for supporting the water tank 51 are installed on the rear surface of the denitration tower 1 , and an L-shaped limiting plate 7 for limiting the moving position of the water tank 51 is installed on the top surface of the supporting plate 4 .

[0030] The driving assembly 6 includes a mounting plate 61 mounted on the rear surface of the water tank 51, a motor 62 is mounted on the bottom surface of the mounting plate 61, a gear 63 is mounted on the output end of the motor 62, the outer surface of the gear 63 is meshed with a rack 64, and the rack 64 is mounted on the bottom surface of one of the supporting plates 4. The gear 63 is driven to rotate by the motor 62, and the gear 63 is engaged with the rack 64 to push the mounting plate 61 and the water tank 51 connected thereto forward or backward.

[0031] Figures 1-4A second embodiment is shown, which mainly differs from the first embodiment in that: the inner wall of the denitrification tower 1 is fixedly connected to a support frame 15 at the top surface of the rear opening 14, and a front opening 13 is penetrated through the top surface of the support frame 15 on the front surface of the denitrification tower 1. A placement frame 3 is provided inside the denitrification tower 1, and the placement frame 3 can slide freely close to the inner wall of the front opening 13. The bottom surface of the placement frame 3 is in contact with the top surface of the support frame 15, and a catalyst 31 is provided inside the placement frame 3. A fixing plate 17 for limiting the placement frame 3 is installed on the front surface of the denitrification tower 1 by bolts. The placement frame 3 is convenient to remove and install through the front opening 13 on the front surface of the denitrification tower 1. When the catalyst 31 needs to be replaced, the placement frame 3 can be removed from the denitrification tower 1 for replacement by disassembling the fixing plate 17. The operation is simple and convenient, which reduces maintenance costs.

[0032] A cover plate 8 is installed on the rear surface of the denitrification tower 1 by means of bolts. The bottom surface of the cover plate 8 is in contact with the top surface of the water tank 51. Two support plates 16 for supporting the water tank 51 are installed at the bottom surface of the rear opening 14 inside the denitrification tower 1. The cover plate 8 is mainly used to tightly cover the top of the water tank 51 when it is outside, effectively preventing dust from falling into the water tank 51 and ensuring the cleanliness of the inside of the water tank 51. At the same time, the cover plate 8 is installed on the rear surface of the denitrification tower 1 by means of bolts. This installation method is convenient for disassembly and assembly, and is convenient for cleaning the inside of the water tank 51 and maintaining the ultrasonic generator 52 at a later stage, which greatly improves the convenience and maintainability of the equipment.

[0033] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0034] The flue gas generated during the operation of the thermal power unit enters the denitrification tower 1 through the flue gas inlet pipe 11 at the bottom of the denitrification tower 1. At the same time, ammonia in the external ammonia storage tank is input into the denitrification tower 1 through the ammonia inlet pipe 2. The flue gas and ammonia react with each other under the action of the catalyst. The flue gas after denitrification is discharged from the flue gas outlet pipe 12 at the top of the denitrification tower 1.

[0035] When the catalyst 31 needs to be cleaned, the motor 62 starts, driving the gear 63 to rotate, and the gear 63 engages with the rack 64, thereby pushing the mounting plate 61 and the water tank 51 connected thereto forward. When the water tank 51 enters the interior of the denitrification tower 1, the front, left and right sides of the water tank 51 are close to the inner wall of the denitrification tower 1, and the rear side of the water tank 51 will completely block the rear opening 14. At this time, the interior of the denitrification tower 1 is completely isolated by the water tank 51 into two parts, upper and lower. Then, the external water source is introduced into the water inlet pipe 53 through the hose 54, and water is poured into the water tank 51 until the water level completely overflows the water tank 51 and covers the catalyst 31. Then, the ultrasonic generator 52 is started to generate ultrasonic waves to vibrate the water in the water tank 51 and clean the catalyst 31. After cleaning is completed, the cleaned water is discharged through the drain pipe 55. Then, the motor 62 reverses, driving the water tank 51 to move backward and exit the denitrification tower 1.

[0036] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A SCR denitration device for a thermal power plant, comprising a denitration tower (1), characterized in that: A rear opening (14) is provided through the rear surface of the denitration tower (1), and a cleaning mechanism is provided on the rear side of the denitration tower (1), the cleaning mechanism comprising: A cleaning assembly (5) can pass through the rear opening (14) and enter the interior of the denitrification tower (1). The cleaning assembly (5) includes a water tank (51). The outer surface of the water tank (51) can slide freely against the inner wall of the rear opening (14). An ultrasonic generator (52) is provided at the bottom of the water tank (51). The rear surface of the water tank (51) is fixedly connected to a water inlet pipe (53). The end of the water inlet pipe (53) is fixedly connected to a hose (54). A position of the rear surface of the water tank (51) away from the water inlet pipe (53) is fixedly connected to a drain pipe (55). The driving assembly (6) is used to drive the cleaning assembly (5) to move forward and backward.

2. The SCR denitration device for a thermal power plant according to claim 1, characterized in that: The bottom of the denitrification tower (1) is fixedly connected to a smoke inlet pipe (11), and the top of the denitrification tower (1) is fixedly connected to a smoke outlet pipe (12). An ammonia inlet pipe (2) is provided through the front surface of the smoke inlet pipe (11). The output end of the ammonia inlet pipe (2) is placed inside the denitrification tower (1), and the input end of the ammonia inlet pipe (2) is connected to an external ammonia storage tank.

3. The SCR denitrification device for a thermal power plant according to claim 1, characterized in that: The inner wall of the denitration tower (1) is fixedly connected to a support frame (15) at the top surface of the rear opening (14); the front surface of the denitration tower (1) is provided with a front opening (13) through the top surface of the support frame (15); a placement frame (3) is provided inside the denitration tower (1); the placement frame (3) can slide freely close to the inner wall of the front opening (13); the bottom surface of the placement frame (3) is in contact with the top surface of the support frame (15); a catalyst (31) is provided inside the placement frame (3); and a fixing plate (17) for limiting the placement frame (3) is installed on the front surface of the denitration tower (1) by bolts.

4. The SCR denitrification device for a thermal power plant according to claim 1, characterized in that: Two supporting plates (4) for supporting the water tank (51) are installed on the rear surface of the denitration tower (1), and an L-shaped limiting plate (7) for limiting the moving position of the water tank (51) is installed on the top surface of the supporting plate (4).

5. The SCR denitration device for a thermal power plant according to claim 4, characterized in that: The driving assembly (6) comprises a mounting plate (61) mounted on the rear surface of the water tank (51), a motor (62) being mounted on the bottom surface of the mounting plate (61), a gear (63) being mounted on the output end of the motor (62), a rack (64) being meshed and connected on the outer surface of the gear (63), and the rack (64) being mounted on the bottom surface of one of the bearing plates (4).

6. The SCR denitration device for a thermal power plant according to claim 1, characterized in that: A cover plate (8) is installed on the rear surface of the denitration tower (1) by means of bolts, the bottom surface of the cover plate (8) contacts the top surface of the water tank (51), and two support plates (16) for supporting the water tank (51) are installed at the bottom surface of the rear opening (14) inside the denitration tower (1).

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