Soot blowing valve, soot blowing system and thermal generator set
By designing a sootblowing valve with a double sealing structure, the problem of internal leakage of the sootblowing valve due to high-pressure and high-temperature sootblowing gas is solved, the four boiler tubes are protected, the service life is increased and the maintenance cost is reduced.
Patent Information
- Application Number
- CN202422303189.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-09-20
AI Technical Summary
The sootblowing valve is prone to internal leakage due to high-pressure, high-temperature sootblowing gas and particulate matter, resulting in damage to the four boiler tubes.
A sootblowing valve is designed with a double sealing structure, including a first sealing structure and a third sealing structure, and a second sealing structure and a fourth sealing structure. By controlling the movement of the core body in the cavity, the sootblowing gas main pipe and the four boiler pipes can be connected or cut off, ensuring that the airflow does not flow to the four boiler pipes.
It effectively reduces the risk of internal leakage of the sootblowing valve in the cut-off state, prolongs its service life, and reduces the frequency of inspection and maintenance costs.
Smart Images
Figure CN223359939U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of sootblowing equipment, and in particular to a sootblowing valve, a sootblowing system and a thermal power generator set. Background Art
[0002] Thermal power generating units are typically equipped with a sootblowing system to purge accumulated soot from the four boiler tubes. A sootblowing valve is used to control the connection between the sootblowing gas main and the four boiler tubes. However, due to the high pressure and temperature of the sootblowing gas provided by the main tube, and the inevitable presence of fine particles such as pulverized coal and dust in the sootblowing gas, the sootblowing valve is prone to internal leakage, resulting in long-term sootblowing gas flow into the four boiler tubes, causing damage to the four boiler tubes. Utility Model Content
[0003] The purpose of the present disclosure is to provide a sootblowing valve, a sootblowing system and a thermal power generator set to solve the above technical problems.
[0004] In order to achieve the above objectives, according to a first aspect of the present disclosure, a sootblowing valve is provided for use in a sootblowing system, comprising:
[0005] The cage body has a cavity formed therein, the cavity having an air inlet and an air outlet, the air inlet being connected to the sootblowing gas main pipe of the sootblowing system, and the air outlet being connected to the four boiler pipes of the thermal power generator set, and the cavity also having a first sealing structure and a second sealing structure;
[0006] a core body movably disposed in the cavity, wherein a third sealing structure and a fourth sealing structure are formed on the core body, and the sootblowing valve has a connecting state and a shutoff state;
[0007] In the communication state, there is a gap between the first sealing structure and the third sealing structure, there is a gap between the second sealing structure and the fourth sealing structure, and the air inlet is communicated with the air outlet;
[0008] In the cut-off state, the first sealing structure is sealed in cooperation with the third sealing structure, the second sealing structure is sealed in cooperation with the fourth sealing structure, and the air inlet and the air outlet are cut off.
[0009] Optionally, the cavity is configured as a cylindrical cavity extending along a first direction, and the inner peripheral wall of the cavity includes a first inner peripheral wall, a second inner peripheral wall, and a third inner peripheral wall sequentially arranged along the first direction, wherein the diameters of the first inner peripheral wall, the second inner peripheral wall, and the third inner peripheral wall increase sequentially, and the first inner peripheral wall and the second inner peripheral wall are connected via a first transition surface, and the second inner peripheral wall and the third inner peripheral wall are connected via a second transition surface.
[0010] The first inner peripheral wall, the second inner peripheral wall, and the third inner peripheral wall are all located between the air inlet and the air outlet;
[0011] The core body is configured as a cylindrical member extending along the first direction. The outer peripheral wall of the core body includes a first peripheral wall, a second peripheral wall, and a third peripheral wall sequentially arranged along the first direction. The diameters of the first peripheral wall, the second peripheral wall, and the third peripheral wall increase sequentially. The first peripheral wall and the second peripheral wall are connected via a third transition surface, and the second peripheral wall and the third peripheral wall are connected via a fourth transition surface.
[0012] The first sealing structure includes the first transition surface, the second sealing structure includes the second transition surface, the third sealing structure includes the third transition surface, and the fourth sealing structure includes the fourth transition surface. The core body is movably arranged along the first direction to cooperate with the cavity so that the first transition surface and the third transition surface can be detachably sealed and fitted, and the second transition surface and the fourth transition surface can be detachably sealed and fitted.
[0013] Optionally, the first transition surface and the third transition surface are both configured as conical surfaces extending in a direction inclined to the second direction; and / or,
[0014] The second transition surface and the fourth transition surface are both configured as conical surfaces extending in a direction inclined to the second direction;
[0015] The second direction is perpendicular to the first direction.
[0016] Optionally, a nitride layer is formed on the surfaces of the first transition surface, the second transition surface, the third transition surface, and the fourth transition surface.
[0017] Optionally, the thickness of the nitride layer is 0.02 mm to 0.04 mm.
[0018] Optionally, the surface roughness of the first transition surface, the second transition surface, the third transition surface, and the fourth transition surface is 1.5 μm to 5.5 μm.
[0019] Optionally, the air inlet is formed at one end of the cavity close to the first inner circumferential wall, and the air outlet includes a plurality of air outlet holes formed on the third inner circumferential wall, and the plurality of air outlet holes are arranged at intervals along the first direction.
[0020] Optionally, a first limiting portion is provided in the cavity, and a second limiting portion is provided on the core body, and the first limiting portion is located on a moving path of the second limiting portion so that the first limiting portion can abut against the second limiting portion.
[0021] According to a second aspect of the present disclosure, a sootblowing system is provided, comprising a sootblowing gas main pipe and the above-mentioned sootblowing valve, wherein the air inlet is connected to the sootblowing gas main pipe.
[0022] According to a third aspect of the present disclosure, a thermal power generating set is provided, comprising four boiler tubes and the above-mentioned soot blowing system, wherein the air outlet is connected to the four boiler tubes.
[0023] Through the above technical solution, the air inlet can be connected to the sootblowing gas main pipe of the sootblowing system, and the air outlet can be connected to the four boiler pipes of the thermal power generator set, so that the sootblowing gas main pipe can be connected to the four boiler pipes via the cavity. The sootblowing valve can be switched to the cut-off state by controlling the movement of the core body in the cavity, that is, the third sealing structure on the core body is sealed with the first sealing structure in the cavity, and the fourth sealing structure on the core body is sealed with the second sealing structure in the cavity, so that the air inlet and the air outlet are cut off, and the air flow in the sootblowing gas main pipe will not flow to the four boiler pipes. The sootblowing valve can also be switched to the connecting state by controlling the movement of the core body in the cavity, that is, there is a gap between the third sealing structure on the core body and the first sealing structure in the cavity, and there is a gap between the fourth sealing structure on the core body and the second sealing structure in the cavity, so that the air inlet and the air outlet are connected, and the air flow in the sootblowing gas main pipe will not flow to the four boiler pipes.
[0024] Since the airflow between the air inlet and the air outlet can be cut off by the sealing cooperation of the first sealing structure and the third sealing structure, and the airflow between the air inlet and the air outlet can also be cut off by the sealing cooperation of the second sealing structure and the fourth sealing structure, the sootblowing valve provided by the present invention can doubly cut off the airflow from the sootblowing gas main pipe to the four tubes of the boiler. In other words, when the first sealing structure or the third sealing structure is damaged, the second sealing structure and the fourth sealing structure can also play a cutting role. Similarly, when the second sealing structure or the fourth sealing structure is damaged, the first sealing structure and the third sealing structure can also play a sealing role, which is beneficial to reduce the risk of internal leakage of the sootblowing valve in the cut-off state, and further helps to reduce the risk of sootblowing gas damaging the four tubes of the boiler.
[0025] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:
[0027] Figure 1 2 is a cross-sectional view of a sootblowing valve provided in one embodiment of the present disclosure, wherein the sootblowing valve is in a connected state.
[0028] Figure 2 2 is a cross-sectional view of a sootblowing valve provided in one embodiment of the present disclosure, wherein the sootblowing valve is in a cut-off state.
[0029] Description of Reference Numerals
[0030] 10-cage body; 11-cavity; 111-first inner circumferential wall; 112-second inner circumferential wall; 113-third inner circumferential wall; 12-air inlet; 13-air outlet; 131-air outlet; 14-first limiting portion; 20-core body; 21-first outer circumferential wall; 22-second outer circumferential wall; 23-third outer circumferential wall; 24-second limiting portion; 31-first sealing structure; 311-first transition surface; 32-second sealing structure; 321-second transition surface; 33-third sealing structure; 331-third transition surface; 34-fourth sealing structure; 341-fourth transition surface. DETAILED DESCRIPTION
[0031] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.
[0032] In this disclosure, unless otherwise indicated, directional terms such as "upper," "lower," "top," and "bottom" are generally defined relative to the sootblower valve in normal use. These terms are intended solely to facilitate and simplify the description of this disclosure and are not intended to indicate or imply that the device or component referred to must have a specific orientation, structure, or operation. Therefore, they should not be construed as limitations of this disclosure. "Inner" and "outer" refer to the inside and outside of the corresponding component outlines. Furthermore, the terms "first" and "second," etc., are used to distinguish one element from another and do not convey sequential or significant meanings.
[0033] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "connected," "connected," and "installed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; and they may refer to direct connections or indirect connections via an intermediary. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.
[0034] like Figure 1 and Figure 2As shown, according to the first aspect of the present disclosure, a sootblowing valve is provided for a sootblowing system, comprising a cage 10 and a core 20. A cavity 11 is formed inside the cage 10. The cavity 11 is formed with an air inlet 12 and an air outlet 13. The air inlet 12 is used to connect to the sootblowing gas main pipe of the sootblowing system, and the air outlet 13 is used to connect to the four boiler pipes of the thermal power generator set. A first sealing structure 31 and a second sealing structure 32 are also formed in the cavity 11. The core 20 is movably arranged in the cavity 11. The third sealing structure 33 and the fourth sealing structure 34, and the sootblowing valve has a connected state and a cut-off state. In the connected state, there is a gap between the first sealing structure 31 and the third sealing structure 33, and there is a gap between the second sealing structure 32 and the fourth sealing structure 34, and the air inlet 12 and the air outlet 13 are connected. In the cut-off state, the first sealing structure 31 and the third sealing structure 33 are sealed together, and the second sealing structure 32 and the fourth sealing structure 34 are sealed together, and the air inlet 12 and the air outlet 13 are cut off.
[0035] By means of the above technical solution, the air inlet 12 can be connected to the soot blowing gas main pipe of the soot blowing system, and the air outlet 13 can be connected to the four boiler pipes of the thermal power generator set, so that the soot blowing gas main pipe can be connected to the four boiler pipes via the cavity 11, and the soot blowing valve can be switched to the cut-off state by controlling the activity of the core body 20 in the cavity 11, that is, the third sealing structure 33 on the core body 20 is sealed with the first sealing structure 31 in the cavity 11, and the fourth sealing structure 34 on the core body 20 is sealed with the second sealing structure 32 in the cavity 11, so that the air inlet The air inlet 12 and the air outlet 13 are cut off, so that the air flow in the sootblowing gas main pipe will not flow to the four boiler pipes. The sootblowing valve can also be switched to a connected state by controlling the movement of the core body 20 in the cavity 11, that is, there is a gap between the third sealing structure 33 on the core body 20 and the first sealing structure 31 in the cavity 11, and there is a gap between the fourth sealing structure 34 on the core body 20 and the second sealing structure 32 in the cavity 11, so that the air inlet 12 and the air outlet 13 are connected, so that the air flow in the sootblowing gas main pipe will not flow to the four boiler pipes.
[0036] Since the airflow between the air inlet 12 and the air outlet 13 can be cut off by the sealing cooperation of the first sealing structure 31 and the third sealing structure 33, and the airflow between the air inlet 12 and the air outlet 13 can also be cut off by the sealing cooperation of the second sealing structure 32 and the fourth sealing structure 34, the sootblowing valve provided in the present invention can doubly cut off the airflow from the sootblowing gas main pipe to the four pipes of the boiler. In other words, when the first sealing structure 31 or the third sealing structure 33 is damaged, the second sealing structure 32 and the fourth sealing structure 34 can also play a cutting off role. Similarly, when the second sealing structure 32 or the fourth sealing structure 34 is damaged, the first sealing structure 31 and the third sealing structure 33 can also play a sealing role, which is beneficial to reduce the risk of internal leakage of the sootblowing valve in the cut-off state, and further helps to reduce the risk of sootblowing gas damaging the four pipes of the boiler.
[0037] In addition, the sootblowing valve provided by the present disclosure has good anti-internal leakage capability, and is also beneficial for ensuring its own functionality (i.e., sealing performance) under long-term use, thereby helping to increase the service life of the sootblowing valve, and further helping to reduce the inspection frequency and maintenance cost required for the sootblowing valve.
[0038] It should be noted that the four boiler tubes in this article refer to the boiler's water-cooled wall tubes, superheater tubes, reheater tubes and economizer tubes.
[0039] The present disclosure does not limit the structures of the first transition surface 311, the second transition surface 321, the third transition surface 331 and the fourth transition surface 341. As an embodiment, Figure 1 and Figure 2As shown, the cavity 11 is constructed as a cylindrical cavity extending along the first direction, and the inner peripheral wall of the cavity 11 includes a first inner peripheral wall 111, a second inner peripheral wall 112 and a third inner peripheral wall 113 arranged in sequence along the first direction. The diameters of the first inner peripheral wall 111, the second inner peripheral wall 112 and the third inner peripheral wall 113 increase in sequence. The first inner peripheral wall 111 and the second inner peripheral wall 112 are connected by a first transition surface 311, and the second inner peripheral wall 112 and the third inner peripheral wall 113 are connected by a second transition surface 321. The first inner peripheral wall 111, the second inner peripheral wall 112 and the third inner peripheral wall 113 are all located between the air inlet 12 and the air outlet 13. The core 20 is constructed as a cylindrical member extending along the first direction. The outer peripheral wall of the core 20 includes a first inner peripheral wall 21, a second inner peripheral wall 112 and a third inner peripheral wall 113 arranged in sequence along the first direction. The diameters of the peripheral wall 22 and the third peripheral wall 23, the first peripheral wall 21, the second peripheral wall 22 and the third peripheral wall 23 increase successively, the first peripheral wall 21 and the second peripheral wall 22 are connected by a third transition surface 331, and the second peripheral wall 22 and the third peripheral wall 23 are connected by a fourth transition surface 341. The first sealing structure 31 includes a first transition surface 311, the second sealing structure 32 includes a second transition surface 321, the third sealing structure 33 includes a third transition surface 331, and the fourth sealing structure 34 includes a fourth transition surface 341. The core 20 is movably arranged along the first direction to cooperate with the cavity 11, so that the first transition surface 311 and the third transition surface 331 can be detachably sealed and fitted, and the second transition surface 321 and the fourth transition surface 341 can be detachably sealed and fitted.
[0040] Such arrangement makes it possible to control the core body 20 to move forward or backward along the first direction to achieve the sealing fit or separation of the first transition surface 311 and the third transition surface 331, and to achieve the sealing fit or separation of the second transition surface 321 and the fourth transition surface 341. Since the first inner circumferential wall 111, the second inner circumferential wall 112, and the third inner circumferential wall 113 are all located between the air inlet 12 and the air outlet 13, when the first transition surface 311 and the third transition surface 331 are sealed together and the second transition surface 321 and the fourth transition surface 341 are sealed together, the air inlet 12 and the air outlet 13 are cut off. When the first transition surface 311 and the third transition surface 331 are separated and the second transition surface 321 and the fourth transition surface 341 are separated, the air inlet 12 and the air outlet 13 are connected, thereby realizing the switching of the soot blowing valve between the connected state and the cut-off state.
[0041] Here, as Figure 1 and Figure 2 As shown, the first direction may be the axial direction of the cavity 11 , and the second direction may be the radial direction of the cavity 11 .
[0042] In the present disclosure, the first transition surface 311 and the third transition surface 331 can be configured in any suitable shape. As an embodiment, Figure 2 As shown, both the first transition surface 311 and the third transition surface 331 are configured as conical surfaces extending in a direction inclined relative to a second direction, where the second direction is perpendicular to the first direction. This configuration allows the first transition surface 311 and the third transition surface 331 to have larger surface areas, thereby increasing the contact area between the first transition surface 311 and the third transition surface 331, and thereby improving the sealing performance of the sootblowing valve.
[0043] Similarly, the second transition surface 321 and the fourth transition surface 341 can also be constructed in any suitable shape. As an embodiment, Figure 2 As shown, the second transition surface 321 and the fourth transition surface 341 are both configured as conical surfaces extending in a direction inclined relative to a second direction, where the second direction is perpendicular to the first direction. This configuration allows the second transition surface 321 and the fourth transition surface 341 to have larger surface areas, thereby increasing the contact area between the second transition surface 321 and the fourth transition surface 341, and thereby improving the sealing performance of the sootblowing valve.
[0044] As another embodiment of the present disclosure, the first transition surface 311 and the third transition surface 331 are both configured as planes extending along the second direction, that is, planes extending along the radial direction of the cavity 11 .
[0045] To increase the service life of the sootblowing valve, a nitride layer may optionally be formed on the surfaces of the first transition surface 311, the second transition surface 321, the third transition surface 331, and the fourth transition surface 341. Specifically, the surfaces of the first transition surface 311, the second transition surface 321, the third transition surface 331, and the fourth transition surface 341 may be nitrided to form a nitride layer. The nitride layer has excellent wear resistance, which helps reduce wear between the sealing surfaces (i.e., between the first transition surface 311 and the third transition surface 331, and between the second transition surface 321 and the fourth transition surface 341). It also helps reduce scratches on the sealing surfaces caused by fine particles in the airflow passing through the cavity 11, thereby maintaining the sealing performance of the first transition surface 311, the second transition surface 321, the third transition surface 331, and the fourth transition surface 341, thereby increasing the service life of the sootblowing valve.
[0046] The present disclosure does not limit the thickness of the nitride layer. Optionally, the thickness of the nitride layer can be 0.02 mm to 0.04 mm. This configuration can ensure the sealing performance of the first transition surface 311, the second transition surface 321, the third transition surface 331, and the fourth transition surface 341 while shortening the processing time and reducing the processing cost of the nitride layer.
[0047] In order to improve the sealing between the first transition surface 311 and the third transition surface 331 and the sealing between the second transition surface 321 and the fourth transition surface 341, as an embodiment, the surface roughness of the first transition surface 311, the second transition surface 321, the third transition surface 331 and the fourth transition surface 341 can be 1.5μm~5.5μm.
[0048] By grinding the surface roughness of the first transition surface 311, the second transition surface 321, the third transition surface 331 and the fourth transition surface 341 to 1.5μm~5.5μm, the time and material usage required for grinding the surfaces of the first transition surface 311, the second transition surface 321, the third transition surface 331 and the fourth transition surface 341 can be reduced while ensuring the performance of the nitride layer, thereby helping to reduce costs.
[0049] In order to improve the flow regulating capability of the sootblowing valve to the air flow, as an implementation method, Figure 1 and Figure 2 As shown, the air inlet 12 is formed at one end of the cavity 11 close to the first inner wall 111 , and the air outlet 13 includes a plurality of air outlet holes 131 formed on the third inner wall 113 , and the plurality of air outlet holes 131 are arranged at intervals along the first direction.
[0050] Since the multiple air outlet holes 131 are arranged at intervals along the first direction, as the core 20 moves along the first direction, the projection of the core 20 along its own radial direction can cover different numbers of air outlet holes 131. Therefore, by designing the size and number of the air outlet holes 131, the controllability of the soot blowing valve in regulating the air flow rate can be improved, which is beneficial to improving the soot blowing valve's ability to regulate the air flow rate.
[0051] The present disclosure does not limit the number of the air outlet holes 131 at different positions in the first direction. Figure 2 As shown, the plurality of air outlet holes 131 may be arranged so that the number thereof gradually increases in a direction away from the air inlet 12 .
[0052] In order to improve the service life of the first sealing structure 31, the second sealing structure 32, the third sealing structure 33 and the fourth sealing structure 34, optionally, a first limiting portion 14 is provided in the cavity 11, and a second limiting portion 24 is provided on the core body 20, and the first limiting portion 14 is located on the moving path of the second limiting portion 24, so that the first limiting portion 14 can abut against the second limiting portion 24.
[0053] Since the first limiting portion 14 is located on the moving path of the second limiting portion 24, when the third sealing structure 33 and the fourth sealing structure 34 move to the sealing position along with the core 20, the first limiting portion 14 can abut against the second limiting portion 24, that is, the first limiting portion 14 and the second limiting portion 24 absorb the impact of the movement of the core 20, thereby limiting the third sealing structure 33 from continuing to move toward the first sealing structure 31, and limiting the fourth sealing structure 34 from continuing to move toward the second sealing structure 32, thereby facilitating the improvement of the service life of the first sealing structure 31, the second sealing structure 32, the third sealing structure 33 and the fourth sealing structure 34.
[0054] According to a second aspect of the present disclosure, a sootblowing system is provided, comprising a sootblowing gas main pipe and the above-mentioned sootblowing valve, wherein the air inlet 12 is connected to the sootblowing gas main pipe.
[0055] According to a third aspect of the present disclosure, a thermal power generating set is provided, comprising four boiler tubes and the above-mentioned soot blowing system, wherein the air outlet 13 is connected to the four boiler tubes.
[0056] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.
[0057] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
[0058] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
Claims
1. A sootblowing valve for a sootblowing system, characterized in that: include: The cage body has a cavity formed therein, the cavity having an air inlet and an air outlet, the air inlet being connected to the sootblowing gas main pipe of the sootblowing system, and the air outlet being connected to the four boiler pipes of the thermal power generator set, and the cavity also having a first sealing structure and a second sealing structure; a core body movably disposed in the cavity, wherein a third sealing structure and a fourth sealing structure are formed on the core body, and the sootblowing valve has a connecting state and a shutoff state; In the communication state, there is a gap between the first sealing structure and the third sealing structure, there is a gap between the second sealing structure and the fourth sealing structure, and the air inlet is communicated with the air outlet; In the cut-off state, the first sealing structure is sealed in cooperation with the third sealing structure, the second sealing structure is sealed in cooperation with the fourth sealing structure, and the air inlet and the air outlet are cut off.
2. The sootblowing valve according to claim 1, characterized in that The cavity is configured as a cylindrical cavity extending along a first direction, wherein the inner peripheral wall of the cavity comprises a first inner peripheral wall, a second inner peripheral wall, and a third inner peripheral wall sequentially arranged along the first direction, wherein the diameters of the first inner peripheral wall, the second inner peripheral wall, and the third inner peripheral wall increase sequentially, wherein the first inner peripheral wall and the second inner peripheral wall are connected via a first transition surface, and the second inner peripheral wall and the third inner peripheral wall are connected via a second transition surface. The first inner peripheral wall, the second inner peripheral wall, and the third inner peripheral wall are all located between the air inlet and the air outlet; The core body is configured as a cylindrical member extending along the first direction. The outer peripheral wall of the core body includes a first peripheral wall, a second peripheral wall, and a third peripheral wall sequentially arranged along the first direction. The diameters of the first peripheral wall, the second peripheral wall, and the third peripheral wall increase sequentially. The first peripheral wall and the second peripheral wall are connected via a third transition surface, and the second peripheral wall and the third peripheral wall are connected via a fourth transition surface. The first sealing structure includes the first transition surface, the second sealing structure includes the second transition surface, the third sealing structure includes the third transition surface, and the fourth sealing structure includes the fourth transition surface. The core body is movably arranged along the first direction to cooperate with the cavity so that the first transition surface and the third transition surface can be detachably sealed and fitted, and the second transition surface and the fourth transition surface can be detachably sealed and fitted.
3. The sootblowing valve according to claim 2, characterized in that The first transition surface and the third transition surface are both configured as conical surfaces extending in a direction inclined to the second direction; and / or, The second transition surface and the fourth transition surface are both configured as conical surfaces extending in a direction inclined to the second direction; The second direction is perpendicular to the first direction.
4. The sootblowing valve according to claim 2, characterized in that A nitride layer is formed on the surfaces of the first transition surface, the second transition surface, the third transition surface, and the fourth transition surface.
5. The sootblowing valve according to claim 4, characterized in that: The thickness of the nitride layer is 0.02 mm to 0.04 mm.
6. The sootblowing valve according to claim 2, characterized in that The surface roughness of the first transition surface, the second transition surface, the third transition surface, and the fourth transition surface is 1.5 μm to 5.5 μm.
7. The sootblowing valve according to claim 2, characterized in that The air inlet is formed at one end of the cavity close to the first inner peripheral wall, and the air outlet includes a plurality of air outlet holes formed on the third inner peripheral wall, and the plurality of air outlet holes are arranged at intervals along the first direction.
8. The sootblowing valve according to any one of claims 1 to 7, characterized in that: A first limiting portion is provided in the cavity, and a second limiting portion is provided on the core body. The first limiting portion is located on a moving path of the second limiting portion so that the first limiting portion can abut against the second limiting portion.
9. A sootblowing system, characterized in that: It comprises a sootblowing gas main pipe and a sootblowing valve according to any one of claims 1 to 8, wherein the air inlet is connected to the sootblowing gas main pipe.
10. A thermal power generating set, characterized in that: It comprises four boiler tubes and the sootblowing system according to claim 9, wherein the air outlet is connected to the four boiler tubes.