Soot blower sealing device for preventing gas leakage
By designing the combination of follow-up sealing assembly and flow-guiding seal on the soot blower, the flue gas leakage problem caused by high temperature bending is solved, and the sealing effect is achieved in deformation situations is reduced, and maintenance costs and equipment damage is reduced.
Patent Information
- Application Number
- CN202420989177.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-06-28
- Filing Date
- 2024-05-09
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-09
AI Technical Summary
The soot blower is prone to bending and deforming under high temperature environments, resulting in the leakage of flue gas from the gaps in the desulfurized tube GGH flue gas cooling system, corroding external equipment, and high maintenance costs.
A sealing structure consisting of a front and tail end follower seal plate, a connecting plate and a follower seal assembly is designed, using a follower seal assembly and a flow guide seal to remain sealed when bending, absorbed by a graphite seal ring and a compensation corrugated tube. Energy to ensure that the smoke is not leaked.
It effectively prevents smoke leakage, reduces corrosion and damage to external equipment, reduces maintenance costs, and extends service life.
Smart Images
Figure CN222316190U_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of hinges, and in particular to a sootblower sealing device for preventing gas leakage. Background Art
[0002] Steam soot blower is a kind of soot blower, which is an energy-saving device that must be equipped with boilers in thermal power plants and other industries to remove soot from the heating surface of the boiler to improve the thermal efficiency of the boiler.
[0003] Desulfurization tubular GGH flue gas cooling systems are often used in thermal power plants. The tubular GGH flue gas cooler heat exchange components in the desulfurization tubular GGH flue gas cooling system will accumulate dust during use. Severe dust accumulation on the tubular GGH flue gas cooler heat exchange components will affect the wind resistance and further affect the load of the unit, so a soot blower is needed to clean and blow away the dust.
[0004] When in use, the blow pipe of the soot blower will extend to the desulfurization tube type GGH flue gas cooling system and cooperate with the air duct. However, due to the high temperature inside the desulfurization tube type GGH flue gas cooling system, the blow pipe inside the soot blower will bend and deform under high temperature conditions, and it is difficult to ensure the external sealing of the deformed blow pipe. Since the desulfurization tube type GGH flue gas cooling system is under positive pressure inside, the flue gas in the desulfurization tube type GGH flue gas cooling system will flow outward, and the flue gas in the desulfurization tube type GGH flue gas cooling system will flow out from the gap after the blow pipe is deformed. This flue gas is highly corrosive and will corrode external equipment. As the use time increases, the deformation of the blow pipe will become more and more serious, and the amount of leaked flue gas will increase, which will cause damage to external equipment and is inconvenient for maintenance. Therefore, it is necessary to improve it. Summary of the invention
[0005] The present invention provides a sootblower sealing device for preventing gas leakage, which can effectively ensure the sealing of the blowpipe in the sootblower within the service life after slight deformation, and prevent the corrosive gas in the desulfurization tube type GGH flue gas cooling system from leaking out from the gap, the flue gas will corrode the external equipment to cause losses, the maintenance cost is high, and the flue gas leakage; the present invention solves the technical problems in the prior art that the sootblower in the desulfurization tube type GGH flue gas cooling system has a single structure, the blowpipe inside the sootblower will bend and deform when working for a long time in a high temperature environment, and the corrosive flue gas will leak out from the gap after the blowpipe is deformed, the deformation degree of the blowpipe will become more and more serious with the increase of the use time, the amount of the leaked flue gas will increase, the flue gas will corrode the external equipment, and the maintenance is difficult.
[0006] The above technical problem of the present invention is solved by the following technical scheme: a soot blower sealing device for preventing gas leakage, comprising a purge gun barrel, wherein the purge gun barrel outer sleeve is provided with a sealing structure, the sealing structure comprises an annular front end follower sealing plate and a rear end follower sealing plate which are sleeved outside the purge gun barrel, connecting plates are provided on both sides of the front end follower sealing plate and the rear end follower sealing plate, each connecting plate is provided with a follower sealing assembly, and a flow guide seal is also provided on the front end connecting plate. During operation, the front end of the purge gun barrel is connected to the driving device, which drives the purge chamber to spirally rotate forward or retreat, and the other rear end of the purge gun barrel is connected and coordinated with the system of the desulfurization tubular GGH flue gas cooling system. The purge gun barrel will blow and clean the heat exchange components of the tubular GGH flue gas cooler. Since the desulfurization tubular GGH flue gas cooling system is a positive pressure, the internal flue gas will flow outward. The flue gas is highly corrosive. Due to long-term operation in a high-temperature environment, the purge gun barrel will bend and deform. After the purge gun barrel is deformed, the flue gas will leak out from the gap and corrode the external equipment. The function of the sealing structure is to ensure the sealing between the purge gun barrel and the air duct to prevent To stop smoke leakage, when the purge gun barrel spirally advances or withdraws, the front follower sealing plate and the rear follower sealing plate will contact the curved part and move irregularly with the surface of the curved part. In this process, the connecting plate is in a stationary state, and the front follower sealing plate and the rear follower sealing plate are relatively staggered with the connecting plate under the action of the follower sealing assembly. The follower sealing assembly will ensure the sealing outside the purge gun barrel to prevent smoke from leaking from the gap between the front follower sealing plate and the rear follower sealing plate. The function of the guide seal is to further seal the smoke that is not sealed by the follower sealing assembly to ensure that the smoke cannot leak along the outer wall of the purge gun barrel.
[0007] Preferably, the follower seal assembly comprises a plurality of positioning cavities symmetrically arranged on the connecting plate, a follower rod is arranged in the positioning cavity, a follower ball is arranged at the front end of the follower rod, and the follower ball is embedded in the follower seal plate. The follower rod can rotate slightly, and when the purge barrel spirally advances or withdraws, the front follower seal plate and the rear follower seal plate will contact the curved part and move irregularly along with the surface of the curved part. During this process, the connecting plate is in a stationary state, and the front follower seal plate and the rear follower seal plate will be staggered relative to the connecting plate under the action of the follower rod and the follower ball, so that the purge barrel will not be deformed and cause failure to seal.
[0008] Preferably, a guide ball is provided in the middle of the follower pull rod, and a tension spring is provided between the guide ball and the positioning cavity. In the process of relative staggered displacement of the front follower sealing plate and the rear follower sealing plate and the connecting plate, the front follower sealing plate and the rear follower sealing plate will be clamped to the connecting plates on both sides under the action of the tension spring, ensuring close contact between the two graphite sealing rings. The two graphite sealing rings will also undergo relative staggered displacement, but can always maintain contact sealing, and can seal 80% of the smoke leaking from the air duct.
[0009] Preferably, the dynamic seal assembly further comprises four graphite sealing rings respectively fixed on the front dynamic seal plate, the rear dynamic seal plate and the corresponding contact connection plates, and the two graphite sealing rings on each side are installed in contact and aligned. The function of the graphite sealing ring is to ensure the sealing of the front dynamic seal plate, the rear dynamic seal plate and the corresponding contact connection plates. Under the action of the tension spring, the front dynamic seal plate and the rear dynamic seal plate will be clamped to the connection plates on both sides to ensure close contact between the two graphite sealing rings. The two graphite sealing rings will also undergo relative staggered displacement, but can always maintain contact sealing.
[0010] Preferably, a compensating bellows is provided between the connecting plates at the front and rear sides. The compensating bellows is installed between the front follower sealing plate and the rear follower sealing plate, which can ensure the sealing between the front follower sealing plate and the rear follower sealing plate, and can absorb the energy of the front follower sealing plate and the rear follower sealing plate when they move with the purge gun barrel.
[0011] Preferably, the compensating bellows is filled with a heat-resistant and anti-corrosion filler, and the inner side of the bellows is coated with an anti-corrosion coating. The heat-resistant and anti-corrosion filler in the compensating bellows can fill the space in the chamber of the compensating bellows to prevent gas leakage, while the anti-corrosion coating on the inner side of the compensating bellows can prevent the compensating bellows from being corroded by flue gas, further ensuring the sealing of the compensating bellows and extending the service life of the compensating bellows.
[0012] Preferably, the flow guiding seal comprises a sealing sleeve fixedly connected to the front connecting plate, and a flow guiding sealing cavity is provided in the sealing sleeve. The sealing sleeve is installed at the front end of the purge barrel, and the flow guiding sealing cavity provided in the sealing sleeve is used to store and seal the flue gas that is not sealed by the follower sealing assembly. A part of the flue gas will flow out from the gap of the outer wall of the purge barrel, and the function of the flow guiding sealing cavity is to store and seal this part of the flue gas.
[0013] Preferably, the diversion sealing cavity is provided with a plurality of interconnected sealing interfaces. The diversion sealing cavities in the sealing sleeve are interconnected, and the sealing interfaces can be connected to external equipment such as air ducts to guide and suck out the smoke in the diversion sealing cavity.
[0014] Preferably, a positioning sealing plate is integrally formed on the front connection plate. The tail end where the sealing plate is located is connected to the air duct, and the sealing plate is connected to the air duct and ensures the sealing of the tail end to prevent smoke leakage.
[0015] Preferably, a follower gap is left between the positioning sealing plate and the positioning plate and the purge gun barrel. The function of the follower gap is to facilitate the flue gas guidance, so that the flue gas can flow from the rear end to the front guide seal, and at the same time provide space for the movement of the front follower sealing plate and the rear follower sealing plate.
[0016] Therefore, the soot blower sealing device for preventing gas leakage of the present invention has the following advantages: easy installation, the follower sealing assembly cooperates with the guide seal to ensure that the flue gas at the tail end cannot leak out from the outer wall of the deformed purge barrel, the front end follower sealing plate and the rear end follower sealing plate can move and seal with the outer wall of the purge barrel, the purge barrel will not leak flue gas after deformation, and the flue gas can be prevented from leaking during the service life of the purge barrel, thereby reducing the overhead damage to external equipment and reducing the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 The present invention is a schematic diagram of a front and cross-sectional structure of a sootblower sealing device for preventing gas leakage.
[0018] Figure 2 yes Figure 1 Enlarged view of point A in the middle.
[0019] Figure 3 yes Figure 1 Enlarged view of point B in the middle.
[0020] In the figure, there are a purge gun barrel 1, a front end follower sealing plate 2, a rear end follower sealing plate 3, a connecting plate 4, a positioning cavity 5, a follower pull rod 6, a follower ball 7, a guide ball 8, a tensioning spring 9, a compensating bellows 10, a temperature-resistant and corrosion-resistant filler 11, a mechanical float switch 12, a graphite sealing ring 13, a sealing sleeve 14, a guide sealing cavity 15, a sealing interface 16, a positioning sealing plate 17, and a follower gap 18. DETAILED DESCRIPTION
[0021] The technical solution of the invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.
[0022] Example:
[0023] like Figure 1 and 2As shown in Figure 3, a sootblower sealing device for preventing gas leakage includes a purge gun barrel 1. The purge gun barrel 1 is provided with a sealing structure on its outer sleeve. The sealing structure includes a front end follower sealing plate 2 and a rear end follower sealing plate 3 which are sleeved on the outside of the purge gun barrel 1. Connecting plates 4 are installed on both sides of the front end follower sealing plate 2 and the rear end follower sealing plate 3. Follower sealing assemblies are installed on the connecting plates 4 on the front and rear sides.
[0024] The follower seal assembly includes four positioning cavities 5 symmetrically installed on each connecting plate 4, a follower rod 6 is installed in the positioning cavity 5, a follower ball 7 is fixedly installed at the front end of the follower rod 6, the follower ball 7 is embedded in the follower seal plate, a guide ball 8 is fixedly installed in the middle of the follower rod 6, and a tensioning spring 9 is sleeved between the guide ball 8 and the positioning cavity 5.
[0025] The follower seal assembly also includes a compensation bellows 10 connected between the front and rear connecting plates 4 . The compensation bellows 10 is filled with a temperature-resistant and corrosion-resistant filler 11 , and the inner side of the compensation bellows 10 is coated with a polytetrafluoroethylene coating.
[0026] A mechanical float switch 12 for discharging condensed water is installed inside the bellows.
[0027] Two graphite sealing rings are fixedly installed on the front follower sealing plate 2 and the front connecting plate 4, and the two graphite sealing rings are installed in contact and alignment. Two graphite sealing rings are fixedly installed on the rear follower sealing plate 3 and the rear connecting plate 4, and the two graphite sealing rings are installed in contact and alignment.
[0028] A flow guide seal is also installed on the front connecting plate 4, which includes a sealing sleeve 14 which is sleeved on the outside of the purge barrel 1 and fixedly installed on the front connecting plate 4, and a plurality of flow guide sealing cavities 15 are spaced apart in the sealing sleeve 14, and a plurality of sealing interfaces 16 which are interconnected are opened in the flow guide sealing cavity 15.
[0029] A positioning sealing plate 17 is integrally formed on the connecting plate 4 at the rear end, and a follow-up gap 18 is left between the positioning sealing plate 17 and the positioning plate and the purge gun barrel 1 .
[0030] When in use, first connect the air duct on the external fan with the sealing interface 16, then pass the purge gun barrel 1 through the sealing structure and put it on the outside, the front end of the purge gun barrel 1 is connected to the driving device, the driving device drives the purge cavity to rotate spirally forward or backward, and the other rear end of the purge gun barrel 1 extends to the inside of the tubular GGH flue gas cooling system to clean and blow off the heat exchange components of the tubular GGH flue gas cooler. The function of the positioning sealing plate 17 is to ensure the sealing of the connection with the air duct.
[0031] Due to the long-term operation of the purge barrel 1 under high temperature environment, the purge barrel 1 will bend and deform. When the purge barrel 1 spirally advances or withdraws, the front follower sealing plate 2 and the rear follower sealing plate 3 will contact the curved part and move irregularly along with the surface of the curved part. During this process, the connecting plate 4 is in a stationary state. The front follower sealing plate 2 and the rear follower sealing plate 3 will be staggered relative to the connecting plate 4 under the action of the follower pull rod 6 and the follower ball 7. However, under the action of the tension spring 9, the front follower sealing plate 2 and the rear follower sealing plate 3 will move to the connecting plate 4 on both sides. The connecting plate 4 is clamped to ensure close contact between the two graphite sealing rings. The two graphite sealing rings may also undergo relative staggered displacement, but the contact seal can always be maintained. Since the interior of the desulfurization tubular GGH flue gas cooling system is under positive pressure, the flue gas in the desulfurization tubular GGH flue gas cooling system will flow outward. 80% of the flue gas leaked from the desulfurization tubular GGH flue gas cooling system will flow along the follower gap 18 and be sealed between the graphite sealing rings, and the remaining 20% of the gas will flow along the gap into the guide sealing cavity 15 and be sucked out by the air duct, effectively preventing gas leakage.
[0032] When the sealing sleeve 14 moves with the deformed purge gun barrel 1, the deformation energy will be transmitted to the compensating bellows 10 and absorbed by the compensating bellows 10. The temperature-resistant and corrosion-resistant filler 11 in the compensating bellows 10 can fill the space in the chamber of the compensating bellows 10 to prevent gas leakage.
[0033] Since the temperature difference during operation will cause condensed water to be generated, the mechanical float switch 12 can automatically open to drain water according to the content of the condensed water.
Claims
1. A sootblower sealing device for preventing gas leakage, comprising a purge gun barrel, characterized in that: The outer sleeve of the purge gun barrel is provided with a sealing structure, which includes an annular front end follower sealing plate and a rear end follower sealing plate which are sleeved outside the purge gun barrel. Connecting plates are provided on both sides of the front end follower sealing plate and the rear end follower sealing plate, and each connecting plate is provided with a follower sealing assembly. A flow guide seal is also provided on the front end connecting plate.
2. A sootblower sealing device for preventing gas leakage according to claim 1, characterized in that: The described follower seal assembly comprises a plurality of positioning cavities symmetrically arranged on the connecting plate, a follower pull rod is arranged in the positioning cavity, a follower ball is arranged at the front end of the follower pull rod, and the follower ball is embedded in the follower seal plate.
3. A sootblower sealing device for preventing gas leakage according to claim 2, characterized in that: A guide ball is arranged in the middle of the follower pull rod, and a tension spring is arranged between the guide ball and the positioning cavity.
4. A sootblower sealing device for preventing gas leakage according to claim 2, characterized in that: The follower seal assembly also includes four graphite sealing rings respectively fixed on the front follower seal plate, the rear follower seal plate and the corresponding contact connection plates, and the two graphite sealing rings on each side are contacted and aligned.
5. A sootblower sealing device for preventing gas leakage according to claim 1, characterized in that: A compensating bellows is arranged between the connection plates at the front and rear sides.
6. A sootblower sealing device for preventing gas leakage according to claim 5, characterized in that: The compensating bellows is filled with a temperature-resistant and anti-corrosion filler, and the inner side of the bellows is coated with an anti-corrosion coating.
7. A sootblower sealing device for preventing gas leakage according to claim 1, characterized in that: The flow-guiding seal comprises a sealing sleeve fixedly connected to a front connecting plate, and a flow-guiding sealing cavity is provided in the sealing sleeve.
8. A sootblower sealing device for preventing gas leakage according to claim 7, characterized in that: A plurality of sealing interfaces which are interconnected are arranged in the flow guiding sealing cavity.
9. A sootblower sealing device for preventing gas leakage according to claim 1, characterized in that: A positioning sealing plate is integrally formed on the front end connecting plate.
10. A sootblower sealing device for preventing gas leakage according to claim 9, characterized in that: A follow-up gap is reserved between the positioning sealing plate and the positioning plate and the purge gun barrel.