Denitration inlet flue connecting device for flexible peak regulation of thermal power plant

Abstract

The utility model discloses a denitration inlet flue connecting device for flexible peak regulation of a thermal power plant, which is mounted between a boiler low-temperature superheater and a denitration inlet flue and comprises a denitration inlet flue gas temperature increasing bypass flue and a primary air heating heat exchange flue, the primary air heating and heat exchange flue is arranged on one side of the denitration inlet smoke temperature increasing bypass flue, the connecting pipes are communicated and fixedly arranged at the two ends of the side wall of the denitration inlet smoke temperature increasing bypass flue, and the mounting pipes are fixedly communicated and arranged at the two ends of the primary air heating and heat exchange flue; a mounting cover is fixedly arranged at the end, away from the primary air heating and heat exchange flue, of the mounting pipe and communicates with the mounting pipe. The denitration inlet flue connecting device for the flexible peak regulation of the thermal power plant solves the problem that the sealing performance between a denitration inlet smoke temperature increasing bypass flue and a primary air heating heat exchange flue in the prior art is easily affected due to aging of a sealing gasket.

Description

Technical Field

[0001] This utility model relates to the field of denitrification inlet flue technology, specifically to a denitrification inlet flue connection device for flexible peak shaving in thermal power plants. Background Technology

[0002] The denitrification inlet flue gas connection device for flexible peak shaving in thermal power plants is a device that can effectively increase the denitrification inlet flue gas temperature or heat the primary air when the boiler is operating at different loads. It includes a denitrification inlet flue gas temperature boosting bypass flue gas duct and a primary air heating heat exchange flue gas duct. The upper inlet end of the denitrification inlet flue gas temperature boosting bypass flue gas duct is connected to the boiler's low-temperature superheater, and the lower outlet end is connected to the denitrification inlet flue gas duct. The inlet end of the primary air heating heat exchange flue gas duct is connected to the upper part of the denitrification inlet flue gas temperature boosting bypass flue gas duct, and the outlet end is connected to the lower part of the denitrification inlet flue gas temperature boosting bypass flue gas duct. A primary air heat exchanger is installed on the primary air heating heat exchange flue gas duct, and the primary air heat exchanger is connected to the primary air heating duct.

[0003] The working principle of the denitrification inlet flue gas connection device used for flexible peak shaving in thermal power plants is as follows: When the boiler of the thermal power plant is running at low load, the denitrification inlet flue gas temperature boosting bypass flue gas directly transports a portion of the high-temperature flue gas in the boiler's low-temperature superheater to the denitrification inlet flue gas duct, raising the denitrification inlet flue gas temperature to meet the minimum continuous operating temperature of the denitrification catalyst, thus achieving denitrification under all operating conditions. When the boiler is running at high load, a portion of the high-temperature flue gas in the boiler's low-temperature superheater is transported through the primary air heating heat exchange flue gas duct, and the primary air is transported through the primary air heating duct. The high-temperature flue gas and the primary air exchange heat through the primary air heat exchanger, thereby heating the primary air and increasing its drying output.

[0004] However, in existing technologies, the denitrification inlet flue gas temperature rise bypass duct and the primary air heating heat exchange duct are generally fixed together using welding or flanges. During welding, localized high temperatures can cause thermal stress in the duct metal. Especially since the denitrification inlet flue gas temperature rise bypass duct and the primary air heating heat exchange duct operate at high temperatures, this thermal stress can lead to deformation, cracks, and other defects in the metal near the weld, affecting the duct's sealing performance and structural strength. While flange connections use gaskets to ensure sealing, these gaskets may lose elasticity over time due to aging, wear, and corrosion, leading to decreased sealing performance and flue gas leakage. Furthermore, uneven bolt tightening in flange connections can also affect the sealing effect. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a denitrification inlet flue connection device for flexible peak shaving in thermal power plants, thereby solving the problem mentioned in the background art where the sealing performance between the existing denitrification inlet flue temperature boosting bypass flue and the primary air heating heat exchange flue is easily affected by the aging of the sealing gasket.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a denitrification inlet flue gas connection device for flexible peak shaving in thermal power plants, installed between the boiler low-temperature superheater and the denitrification inlet flue gas, including a denitrification inlet flue gas temperature rise bypass flue gas and a primary air heating heat exchange flue gas. The two ends of the denitrification inlet flue gas temperature rise bypass flue gas are respectively connected to the boiler low-temperature superheater and the denitrification inlet flue gas. The primary air heating heat exchange flue gas is disposed on one side of the denitrification inlet flue gas temperature rise bypass flue gas. It also includes a connecting pipe, an installation pipe, and a positioning mechanism. The connecting pipe is connected to and fixedly disposed at both ends of the side wall of the denitrification inlet flue gas temperature rise bypass flue gas. The installation pipe is fixedly disposed at both ends of the primary air heating heat exchange flue gas. An installation cover is fixedly disposed at the end of the installation pipe away from the primary air heating heat exchange flue gas. The installation cover is connected to the installation pipe. The connecting pipe extends into the installation cover. The positioning mechanism is disposed between the connecting pipe and the installation cover for positioning and sealing between the connecting pipe and the installation cover.

[0009] Preferably, the positioning mechanism includes:

[0010] A sealing ring is fixedly disposed on the side wall of the connecting pipe;

[0011] A sealing ring is fitted onto the side wall of the sealing ring, and the sealing ring contacts the side wall of the mounting cover and the side wall of the sealing ring.

[0012] The mounting cover has two positioning grooves arranged in a ring on its side wall, and a positioning column is rotatably arranged in the positioning groove.

[0013] A positioning block, which is fixedly mounted on the side wall of the positioning column;

[0014] A first rotating mechanism is disposed on the mounting cover and is used to drive the two positioning columns to rotate synchronously.

[0015] A pressing mechanism is disposed inside the mounting cover and is used to press the sealing ring onto the positioning block.

[0016] Furthermore, the first rotating mechanism includes:

[0017] The first cavity is provided in the mounting cover. A first gear is rotatably arranged in the first cavity on one side of the positioning post. One end of the positioning post is fixedly connected to the adjacent first gear.

[0018] A first toothed ring is rotatably disposed within the first cavity, and the first toothed ring meshes with the first gear;

[0019] A drive mechanism is disposed inside the mounting cover and is used to drive the first gear to rotate.

[0020] Furthermore, the drive mechanism includes:

[0021] A drive groove is formed on the side wall of the mounting cover, and a first drive rod is rotatably disposed at the bottom of the drive groove. The first drive rod is fixedly connected to the first gear nearby.

[0022] The first handwheel is rotatably mounted on the side wall of the mounting cover and is fixedly connected to the first drive rod.

[0023] A torsion spring is fitted onto the first drive rod, and both ends of the torsion spring are fixedly connected to the first handwheel and the bottom of the drive groove, respectively.

[0024] Furthermore, the pressing mechanism includes:

[0025] An annular groove is formed on the inner wall of the mounting cover, and a pressure ring is slidably disposed in the annular groove;

[0026] The positioning post passes through the pressure-holding ring and is slidably connected to the pressure-holding ring;

[0027] Two threaded rods are rotatably disposed within the annular groove, and the threaded rods pass through the pressure-holding ring through threaded engagement;

[0028] The second rotating mechanism, which is mounted on the mounting cover, is used to drive the two threaded rods to rotate synchronously.

[0029] Based on the above scheme, the second rotating mechanism includes:

[0030] The second cavity is annular and is located on one side of the first cavity. Two second gears are rotatably disposed inside the second cavity, and the second gears are fixedly connected to the adjacent threaded rod.

[0031] The second gear ring is rotatably disposed within the second cavity and meshes with the second gear.

[0032] The second handwheel is rotatably mounted on the side wall of the mounting cover, and a second drive rod is fixedly mounted between the second handwheel and the adjacent second gear.

[0033] (III) Beneficial Effects

[0034] Compared with the prior art, this utility model provides a denitrification inlet flue connection device for flexible peak shaving in thermal power plants, which has the following beneficial effects:

[0035] 1. In this utility model, by setting up a positioning mechanism, after the sealing ring and the sealing ring fitted on the sealing ring are inserted into the mounting cover, the rotation of the first handwheel can drive the first gear to rotate. At the same time, the meshing of the first gear and the first gear ring can drive the two first gears and the two positioning pins to rotate synchronously. Thus, the rotation of the positioning pins can drive the positioning block to extend out of the positioning groove. Thus, the positioning block and the sealing ring can be positioned by cooperating with the sealing ring.

[0036] 2. In this utility model, by setting up a pressing mechanism, the rotation of the second handwheel can drive the threaded rod to rotate. At the same time, the threaded rod and the pressing ring are threaded together to drive the pressing ring to cooperate with the positioning block to press the sealing ring, thereby facilitating the improvement of the installation stability between the sealing ring and the mounting cover, thus facilitating the stable installation and fixing between the denitrification inlet flue gas temperature enhancement bypass flue and the primary air heating heat exchange flue.

[0037] 3. In this utility model, the connection pipe, installation pipe and positioning mechanism facilitate the installation and disassembly of the sealing ring and the mounting cover by rotating the first handwheel and the second handwheel, so as to facilitate timely replacement of the sealing ring after aging. This solves the problem that the sealing performance of the denitrification inlet flue gas temperature rise bypass flue and the primary air heating heat exchange flue is easily affected by the aging of the sealing gasket. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of this application;

[0039] Figure 2 This is a schematic diagram of the exploded structure of this application;

[0040] Figure 3 This is a cross-sectional view of the structure at the installation cover of this application;

[0041] Figure 4 This is a cross-sectional view of the first rotating mechanism in this application;

[0042] Figure 5 This is a cross-sectional structural diagram of the second rotating mechanism in this application.

[0043] In the diagram: 1. Denitrification inlet flue gas temperature boosting bypass flue; 2. Primary air heating heat exchange flue; 3. Connecting pipe; 4. Installation pipe; 5. Installation cover; 6. Sealing ring; 7. Positioning groove; 8. Positioning block; 9. First gear; 10. First gear ring; 11. First handwheel; 12. Torsion spring; 13. Annular groove; 14. Pressing ring; 15. Threaded rod; 16. Second gear; 17. Second gear ring; 18. Second handwheel. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] Please see Figures 1-5 A denitrification inlet flue gas connection device for flexible peak shaving in thermal power plants is installed between the boiler low-temperature superheater and the denitrification inlet flue gas. It includes a denitrification inlet flue gas temperature rise bypass flue gas 1 and a primary air heating heat exchange flue gas 2. The two ends of the denitrification inlet flue gas temperature rise bypass flue gas 1 are respectively connected to the boiler low-temperature superheater and the denitrification inlet flue gas. The primary air heating heat exchange flue gas 2 is located on one side of the denitrification inlet flue gas temperature rise bypass flue gas 1. It also includes a connecting pipe 3, an installation pipe 4, and a positioning mechanism. The connecting pipe 3 is connected to and fixedly installed at both ends of the side wall of the denitrification inlet flue gas temperature rise bypass flue gas 1. The installation pipe 4 is fixedly installed at both ends of the primary air heating heat exchange flue gas 2. An installation cover 5 is fixedly installed at the end of the installation pipe 4 away from the primary air heating heat exchange flue gas 2. The installation cover 5 is connected to the installation pipe 4. The connecting pipe 3 extends into the installation cover 5. The positioning mechanism is located between the connecting pipe 3 and the installation cover 5 for positioning and sealing between the connecting pipe 3 and the installation cover 5.

[0046] Reference Figures 2-4The positioning mechanism includes a sealing ring 6, a sealing ring, a positioning groove 7, a positioning block 8, a first rotating mechanism, and a pressing mechanism. The sealing ring 6 is fixedly mounted on the side wall of the connecting pipe 3, and the sealing ring is fitted onto the side wall of the sealing ring 6. The sealing ring contacts the side wall of the mounting cover 5 and the side wall of the sealing ring 6. The side wall of the mounting cover 5 has two annularly formed positioning grooves 7, and a positioning post is rotatably mounted in the positioning groove 7. The positioning block 8 is fixedly mounted on the side wall of the positioning post. The first rotating mechanism is mounted on the mounting cover 5 and is used to drive the two positioning posts to rotate synchronously. The pressing mechanism is mounted inside the mounting cover 5 and is used to press the sealing ring 6 onto the positioning block 8. The first rotating mechanism includes a first cavity, a first gear ring 10, and a driving mechanism. The mounting cover 5 has an annular first cavity, and a first gear 9 is rotatably mounted on one side of the positioning post in the first cavity. One end of the positioning post is fixedly connected to the adjacent first gear 9. The first gear ring 10 is rotatably mounted in the first cavity and meshes with the first gear 9. The driving mechanism is mounted inside the mounting cover 5. The drive mechanism for driving the first gear 9 to rotate includes a drive groove, a first handwheel 11, and a torsion spring 12. The drive groove is located on the side wall of the mounting cover 5. A first drive rod is rotatably mounted at the bottom of the drive groove and is fixedly connected to the adjacent first gear 9. The first handwheel 11 is rotatably mounted on the side wall of the mounting cover 5 and is fixedly connected to the first drive rod. The torsion spring 12 is mounted on the first drive rod, and its two ends are fixedly connected to the first handwheel 11 and the bottom of the drive groove, respectively. Specifically, after the sealing ring 6 and the sealing ring mounted on the sealing ring 6 are inserted into the mounting cover 5, the rotation of the first handwheel 11 can drive the first gear 9 to rotate. At the same time, the meshing of the first gear 9 with the first gear ring 10 drives the two first gears 9 and the two positioning pins to rotate synchronously. Thus, the rotation of the positioning pins can drive the positioning block 8 to extend out of the positioning groove 7. Thus, the positioning block 8 and the sealing ring 6 can be positioned by cooperating with the sealing ring 6.

[0047] Reference Figures 3-5The pressing mechanism includes an annular groove 13, threaded rods 15, and a second rotating mechanism. The annular groove 13 is formed on the inner wall of the mounting cover 5. A pressing ring 14 is slidably disposed in the annular groove 13. A positioning pin passes through the pressing ring 14 and is slidably connected to the pressing ring 14. Two threaded rods 15 are rotatably disposed in the annular groove 13. The threaded rods 15 pass through the pressing ring 14 through threaded engagement. The second rotating mechanism is disposed on the mounting cover 5 and is used to drive the two threaded rods 15 to rotate synchronously. The second rotating mechanism includes a second cavity, a second gear ring 17, and a second handwheel 18. The second cavity is annular and is formed on one side of the first cavity. Two second gears 16 are rotatably disposed in the second cavity. 6 is fixedly connected to the adjacent threaded rod 15. The second toothed ring 17 is rotatably disposed in the second cavity. The second toothed ring 17 meshes with the second gear 16. The second handwheel 18 is rotatably disposed on the side wall of the mounting cover 5. A second drive rod is fixedly disposed between the second handwheel 18 and the adjacent second gear 16. Specifically, the rotation of the second handwheel 18 can drive the threaded rod 15 to rotate. At the same time, the threaded engagement between the threaded rod 15 and the pressure ring 14 drives the pressure ring 14 to cooperate with the positioning block 8 to press the sealing ring 6, thereby facilitating the improvement of the installation stability between the sealing ring 6 and the mounting cover 5, and thus facilitating the stable installation and fixing between the denitrification inlet flue gas temperature raising bypass flue 1 and the primary air heating heat exchange flue 2.

[0048] It should also be noted that the first gear 9 and the second gear 16 are high-precision machined gears.

[0049] Working principle: During use, the operator rotates the first handwheel 11, which drives the first gear 9 to rotate. Simultaneously, the meshing of the first gear 9 with the first gear ring 10 drives both first gears 9 and the two positioning pins to rotate synchronously. This rotation of the positioning pins causes the positioning block 8 to extend into the positioning groove 7. The operator then places the sealing ring onto the sealing ring 6 and inserts the sealing ring 6 into the mounting cover 5. Afterward, the operator releases the first handwheel 11, which is then reset by the elastic force of the torsion spring 12. This causes the positioning block 8 to extend out of the positioning groove 7, thus achieving sealing through the cooperation of the positioning block 8 and the sealing ring 6. After positioning the sealing ring 6 and the mounting cover 5, the operator rotates the second handwheel 18. The rotation of the second handwheel 18 drives one of the second gears 16 to rotate. At the same time, the meshing of the second gear 16 with the second gear ring 17 drives the two threaded rods 15 to rotate. Simultaneously, the threaded engagement of the threaded rods 15 with the pressure ring 14 drives the pressure ring 14 to engage with the positioning block 8 to press the sealing ring 6, thereby improving the installation stability between the sealing ring 6 and the mounting cover 5. This facilitates stable installation and fixation between the denitrification inlet flue gas temperature enhancement bypass flue 1 and the primary air heating heat exchange flue 2, and the sealing ring can seal the mounting cover 5 and the sealing ring 6.

[0050] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A denitrification inlet flue gas connection device for flexible peak shaving in thermal power plants, installed between a boiler low-temperature superheater and a denitrification inlet flue gas, comprising a denitrification inlet flue gas temperature rise bypass flue gas (1) and a primary air heating heat exchange flue gas (2), wherein both ends of the denitrification inlet flue gas temperature rise bypass flue gas (1) are respectively connected to the boiler low-temperature superheater and the denitrification inlet flue gas, and the primary air heating heat exchange flue gas (2) is disposed on one side of the denitrification inlet flue gas temperature rise bypass flue gas (1), characterized in that, Also includes: Connecting pipe (3), the connecting pipe (3) is connected to and fixedly installed at both ends of the side wall of the denitrification inlet flue gas temperature rise bypass flue (1); The mounting pipe (4) is fixedly and connected to both ends of the primary air heating and heat exchange flue (2). An mounting cover (5) is fixedly installed at the end of the mounting pipe (4) away from the primary air heating and heat exchange flue (2). The mounting cover (5) is connected to the mounting pipe (4). The connecting pipe (3) extends into the mounting cover (5); A positioning mechanism is provided between the connecting pipe (3) and the mounting cover (5) for positioning and sealing between the connecting pipe (3) and the mounting cover (5).

2. The denitrification inlet flue gas connection device for flexible peak shaving in thermal power plants according to claim 1, characterized in that, The positioning mechanism includes: A sealing ring (6) is fixedly disposed on the side wall of the connecting pipe (3); A sealing ring is fitted on the side wall of the sealing ring (6), and the sealing ring is in contact with the side wall of the mounting cover (5) and the side wall of the sealing ring (6); The mounting cover (5) has two positioning grooves (7) in a ring shape on its side wall, and a positioning column is rotatably arranged in the positioning groove (7). Positioning block (8), the positioning block (8) is fixedly disposed on the side wall of the positioning column; The first rotating mechanism is disposed on the mounting cover (5) and is used to drive the two positioning columns to rotate synchronously. A pressing mechanism is provided inside the mounting cover (5) for pressing the sealing ring (6) onto the positioning block (8).

3. The denitrification inlet flue connection device for flexible peak shaving in thermal power plants according to claim 2, characterized in that, The first rotating mechanism includes: The first cavity is provided in the mounting cover (5) with an annular first cavity. A first gear (9) is rotatably arranged in the first cavity on one side of the positioning post. One end of the positioning post is fixedly connected to the adjacent first gear (9). The first toothed ring (10) is rotatably disposed in the first cavity and meshes with the first gear (9); A drive mechanism is disposed inside the mounting cover (5) and is used to drive the first gear (9) to rotate.

4. The denitrification inlet flue gas connection device for flexible peak shaving in thermal power plants according to claim 3, characterized in that, The drive mechanism includes: The drive groove is opened on the side wall of the mounting cover (5), and a first drive rod is rotatably provided at the bottom of the drive groove. The first drive rod is fixedly connected to the first gear (9) nearby. The first handwheel (11) is rotatably mounted on the side wall of the mounting cover (5) and is fixedly connected to the first drive rod. A torsion spring (12) is fitted onto the first drive rod, and the two ends of the torsion spring (12) are fixedly connected to the first handwheel (11) and the bottom of the drive groove, respectively.

5. A denitrification inlet flue gas connection device for flexible peak shaving in thermal power plants according to claim 4, characterized in that, The pressing mechanism includes: An annular groove (13) is formed on the inner wall of the mounting cover (5), and a pressure ring (14) is slidably disposed in the annular groove (13); The positioning post passes through the pressure-holding ring (14) and is slidably connected to the pressure-holding ring (14); Threaded rods (15), two threaded rods (15) are rotatably arranged in the annular groove (13), and the threaded rods (15) pass through the pressure ring (14) through threaded engagement; The second rotating mechanism is disposed on the mounting cover (5) and is used to drive the two threaded rods (15) to rotate synchronously.

6. A denitrification inlet flue gas connection device for flexible peak shaving in thermal power plants according to claim 5, characterized in that, The second rotating mechanism includes: The second cavity is annular and is located on one side of the first cavity. Two second gears (16) are rotatably arranged inside the second cavity, and the second gears (16) are fixedly connected to the adjacent threaded rod (15). The second gear ring (17) is rotatably disposed in the second cavity and meshes with the second gear (16); The second handwheel (18) is rotatably mounted on the side wall of the mounting cover (5), and a second drive rod is fixedly mounted between the second handwheel (18) and the adjacent second gear (16).

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