Urea solution spray gun applied to SNCR (selective non-catalytic reduction) system

Abstract

The utility model discloses a urea solution spray gun applied to an SNCR (Selective Non Catalytic Reduction) system, which comprises a boiler wall, a spray gun is inserted in the boiler wall, a first circular ring sleeve is sleeved on the spray gun, two symmetrical abutting plates are rotatably arranged on the first circular ring sleeve, a support rod is rotatably arranged on the abutting plates, and the support rod is sleeved on the first circular ring sleeve. A second circular ring sleeve is arranged on the spray gun in a sliding mode, one end of the supporting rod is rotationally arranged on the second circular ring sleeve, a first threaded sleeve is rotationally arranged outside the spray gun, and a spring is arranged between the second circular ring sleeve and the first threaded sleeve. Through the arrangement of the first circular ring sleeve, the abutting plate, the second circular ring sleeve, the supporting rod, the spring and the first threaded sleeve, the abutting plate and the first threaded sleeve clamp and fix the spray gun on the wall of the boiler, other installation bases are not needed, compared with flange connection, installation of the bases is omitted, the installation process is simplified, and later maintenance and replacement of the spray gun are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of spray guns, in particular to a urea solution spray gun applied to an SNCR system. Background Art

[0002] SNCR denitrification technology is the Selective Non-Catalytic Reduction technology, which is one of the main flue gas denitrification technologies at present. In the narrow temperature range of 850~1100°C in the furnace, without the action of catalyst, urea or ammonia water can be used as a reducing agent to selectively reduce NOx in the flue gas, reduce and remove NOx in the flue gas, and generate ammonia and water for clean denitrification technology.

[0003] During the operation of SNCR denitrification, due to the production process, there are a large number of high-temperature, high-speed fly ash and other solid particles in the flue gas duct. These fly ashes will flush the spray gun longitudinally and tangentially at high speed, and will destroy the front section of the spray gun after a period of time, greatly reducing the atomization effect of the reducing agent; so the spray gun needs to be maintained or replaced regularly. In the prior art, flange connection, a detachable connection method, is mostly used for fixing. However, the flange fixed connection requires welding of the corresponding connection points on the boiler, and the flange connection method uses too many bolts. When the spray gun is maintained or replaced, its disassembly and installation are relatively cumbersome. Utility Model Content

[0004] The utility model aims to provide a urea solution spray gun applied to an SNCR system to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme: a urea solution spray gun applied to an SNCR system, comprising a boiler wall, a spray gun inserted in the boiler wall, a first annular sleeve sleeved on the spray gun, two symmetrical abutment plates rotatably arranged on the first annular sleeve, a support rod rotatably arranged on the abutment plate, a second annular sleeve slidably arranged on the spray gun, one end of the support rod rotatably arranged on the second annular sleeve, a first screw sleeve rotatably arranged outside the spray gun, and a spring arranged between the second annular sleeve and the first screw sleeve.

[0006] Furthermore, a locking block is slidably sleeved on the spray gun, and the locking block is connected to the first screw sleeve through a bearing. The spring is sleeved on the spray gun, and the spring is located between the second annular sleeve and the locking block.

[0007] Furthermore, one end of the spring is fixedly connected to the bottom end of the second annular sleeve, and the other end of the spring is fixedly connected to the top end of the locking block.

[0008] Furthermore, a sealing gasket is provided between the locking block and the boiler wall.

[0009] Furthermore, a second screw sleeve is arranged at the top end of the first circular sleeve, and the second screw sleeve is rotatably arranged on the spray gun.

[0010] Furthermore, a mounting groove is provided on the boiler wall, the spray gun is inserted into the boiler through the mounting groove, the sealing gasket is embedded in the locking block, and the outer diameter of the sealing gasket is larger than the diameter of the mounting groove.

[0011] Furthermore, the outer ring of the bearing is fixedly connected to the bottom end of the locking block, and the inner ring of the bearing is fixedly connected to the top end of the first nut.

[0012] In the above technical scheme, the utility model provides a urea solution spray gun applied to the SNCR system with the beneficial effects:

[0013] The utility model arranges a first circular sleeve, an abutment plate, a second circular sleeve, a support rod, a spring and a first screw sleeve, so that the abutment plate and the first screw sleeve clamp and fix the spray gun on the boiler wall, and no other mounting base is required. Compared with a flange connection, the installation of the base is omitted and the installation process is simplified, which is convenient for the maintenance and replacement of the spray gun in the later stage.

[0014] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0015] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A schematic diagram of the structure after installation provided by an embodiment of the utility model;

[0018] Figure 2 A schematic diagram of the structure during the installation process provided by an embodiment of the utility model;

[0019] Figure 3 The embodiment of the utility model provides Figure 1 A partial enlarged view of .

[0020] Description of reference numerals:

[0021] 1. Boiler wall; 2. Spray gun; 3. Abutment plate; 4. Support rod; 5. First circular ring sleeve; 6. Second circular ring sleeve; 7. Spring; 8. Locking block; 9. Bearing; 10. First screw sleeve; 11. Sealing gasket; 12. Second screw sleeve; 13. Air inlet; 14. Liquid inlet; 15. Mounting groove. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0023] Please refer to 1-3, a urea solution spray gun applied to the SNCR system, including a boiler wall 1, a spray gun 2 is inserted into the boiler wall 1, a first annular sleeve 5 is sleeved on the spray gun 2, two symmetrical abutment plates 3 are rotatably arranged on the first annular sleeve 5, a support rod 4 is rotatably arranged on the abutment plate 3, a second annular sleeve 6 is slidably arranged on the spray gun 2, one end of the support rod 4 is rotatably arranged on the second annular sleeve 6, a first screw sleeve 10 is rotatably arranged outside the spray gun 2, and a spring 7 is arranged between the second annular sleeve 6 and the first screw sleeve 10.

[0024] Specifically, the utility model arranges a first annular sleeve 5, an abutment plate 3, a second annular sleeve 6, a support rod 4, a spring 7, and a first screw sleeve 10, so that the abutment plate 3 and the first screw sleeve 10 clamp and fix the spray gun 2 on the boiler wall 1, without the need for other mounting bases. Compared with the flange connection, the installation of the base is omitted and the installation process is simplified, which is convenient for the later maintenance and replacement of the spray gun 2.

[0025] Furthermore, a locking block 8 is slidably sleeved on the spray gun 2, and the locking block 8 is connected to the first screw sleeve 10 through a bearing 9. The spring 7 is sleeved on the spray gun 2, and the spring 7 is located between the second circular sleeve 6 and the locking block 8. One end of the spring 7 is fixedly connected to the bottom end of the second circular sleeve 6, and the other end of the spring 7 is fixedly connected to the top of the locking block 8. The outer ring of the bearing 9 is fixedly connected to the bottom end of the locking block 8, and the inner ring of the bearing 9 is fixedly connected to the top of the first screw sleeve 10.

[0026] Specifically, refer to Figure 3, the two ends of the spring 7 are fixedly connected to the second annular sleeve 6 and the sealing gasket 11 respectively. When the spray gun 2 needs to be installed on the spray gun 2, the second annular sleeve 6 is first pulled downward, the spring 7 is compressed, the support rod 4 and the abutment plate 3 rotate, and the abutment plate 3 shrinks inward, so that the abutment plate 3 is attached to the periphery of the spray gun 2, and then the spray gun 2 with the abutment plate 3 attached to the periphery is passed through the installation groove 15 into the boiler. After the abutment plate 3 is completely entered into the boiler, the second annular sleeve 6 slides upward under the elastic force of the spring 7, and then the support rod 4 and the abutment plate 3 are supported. The support rod 4 and the abutment plate 3 rotate, causing the abutment plate 3 to expand and prevent the spray gun 2 from being pulled out of the boiler. Then, the first screw sleeve 10 is rotated so that the locking block 8 is pressed against the boiler wall 1. At this time, while the spray gun 2 is clamped on the boiler wall 1 by the abutment plate 3 and the locking block 8, the elastic force of the spring 7 squeezes the second annular sleeve 6 and the locking block 8 at the same time. The second annular sleeve 6 further squeezes the support rod 4, causing the support rod 4 to abut against the abutment plate 3, thereby further enhancing the clamping force between the abutment plate 3 and the locking block 8.

[0027] Furthermore, a sealing gasket 11 is arranged between the locking block 8 and the boiler wall 1 , a mounting groove 15 is opened on the boiler wall 1 , the spray gun 2 is inserted into the boiler through the mounting groove 15 , the sealing gasket 11 is embedded in the locking block 8 , and the outer diameter of the sealing gasket 11 is larger than the diameter of the mounting groove 15 .

[0028] Specifically, by providing a sealing gasket 11 between the boiler wall 1 and the locking block 8 , the sealing performance between the locking block 8 and the boiler wall 1 is enhanced to prevent smoke leakage.

[0029] Furthermore, a second screw sleeve 12 is arranged at the top end of the first annular sleeve 5 , and the second screw sleeve 12 is rotatably arranged on the spray gun 2 .

[0030] Specifically, the second screw sleeve 12 is spirally sleeved on the spray gun 2, and the first annular sleeve 5 is slidably set on the spray gun 2 and is located below the second screw sleeve 12. By twisting the second screw sleeve 12, the distance between the second screw sleeve 12 and the nozzle installed on the spray gun 2 is changed, and then the installation length of the spray gun 2 can be adjusted, which can adapt to more models of boilers and enhance practicality.

[0031] In this utility model, reference is made to Figures 1 to 3First, the depth of the spray gun 2 inserted into the spray gun 2 is determined according to the width of the flue gas passage in the boiler, and then the second screw sleeve 12 is screwed to adjust the installation length of the spray gun 2, and then the first screw sleeve 10 is rotated to make the locking block 8 also slide upward by one end to ensure that the installation is more convenient, and then the second annular sleeve 6 is pulled downward, the spring 7 is compressed, the support rod 4 and the abutment plate 3 rotate, and the abutment plate 3 shrinks inward, so that the abutment plate 3 is attached to the periphery of the spray gun 2, and then the abutment plate 3 attached to the periphery is pulled downward. The spray gun 2 with the connecting plate 3 passes through the installation groove 15 and enters the boiler. After the abutment plate 3 completely enters the boiler, the second annular sleeve 6 slides upward under the elastic force of the spring 7, and then the support rod 4 and the abutment plate 3 rotate, so that the abutment plate 3 expands to prevent the spray gun 2 from being pulled out of the boiler. Then the first screw sleeve 10 is rotated so that the locking block 8 is pressed against the boiler wall 1, and the installation of the spray gun 2 is completed. The air inlet 13 and the liquid inlet 14 connected to the spray gun 2 are the air inlet and the liquid inlet respectively.

[0032] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A urea solution spray gun for a SNCR system, comprising a boiler wall (1), characterized in that: A spray gun (2) is inserted into the boiler wall (1), a first annular sleeve (5) is sleeved on the spray gun (2), two symmetrical abutment plates (3) are rotatably arranged on the first annular sleeve (5), a support rod (4) is rotatably arranged on the abutment plate (3), a second annular sleeve (6) is slidably arranged on the spray gun (2), one end of the support rod (4) is rotatably arranged on the second annular sleeve (6), a first screw sleeve (10) is rotatably arranged outside the spray gun (2), and a spring (7) is arranged between the second annular sleeve (6) and the first screw sleeve (10).

2. The urea solution spray gun for SNCR system according to claim 1, characterized in that: A locking block (8) is slidably sleeved on the spray gun (2), and the locking block (8) is connected to the first screw sleeve (10) through a bearing (9). The spring (7) is sleeved on the spray gun (2), and the spring (7) is located between the second annular sleeve (6) and the locking block (8).

3. The urea solution spray gun for SNCR system according to claim 2, characterized in that: One end of the spring (7) is fixedly connected to the bottom end of the second annular sleeve (6), and the other end of the spring (7) is fixedly connected to the top end of the locking block (8).

4. The urea solution spray gun for SNCR system according to claim 3, characterized in that: A sealing gasket (11) is provided between the locking block (8) and the boiler wall (1).

5. The urea solution spray gun for SNCR system according to claim 4, characterized in that: A second screw sleeve (12) is arranged at the top end of the first circular sleeve (5), and the second screw sleeve (12) is rotatably arranged on the spray gun (2).

6. The urea solution spray gun for SNCR system according to claim 4, characterized in that: The boiler wall (1) is provided with a mounting groove (15), the spray gun (2) is inserted into the boiler through the mounting groove (15), the sealing gasket (11) is embedded in the locking block (8), and the outer diameter of the sealing gasket (11) is larger than the diameter of the mounting groove (15).

7. The urea solution spray gun for SNCR system according to claim 2, characterized in that: The outer ring of the bearing (9) is fixedly connected to the bottom end of the locking block (8), and the inner ring of the bearing (9) is fixedly connected to the top end of the first screw sleeve (10).

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