Soot blower

Abstract

The utility model discloses a soot blower, relates to the technical field of alkali boiler purging, and aims to solve the problems that when a soot blower in the prior art runs, an inner pipe droops under the action of gravity of the inner pipe and is in contact friction with the inner wall of an outer pipe to cause abrasion, and the replacement cost of the inner pipe is high. The soot blower comprises a gas transmission inner pipe, a purging outer pipe and buffer structures, the gas transmission inner pipe extends into the purging outer pipe, the gas transmission inner pipe and the purging outer pipe are coaxial, at least one buffer structure is arranged between the gas transmission inner pipe and the purging outer pipe, and each buffer structure is detachably installed on the outer wall of the gas transmission inner pipe. The soot blower provided by the utility model is used for reducing the replacement frequency of the inner pipe, saving the cost and simultaneously improving the operation stability of the soot blower.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler purging, in particular to a soot blower. Background Art

[0002] During the operation of the boiler, dust and coking on the heating surface are the most common phenomena. The additional thermal resistance brought by the dust layer will seriously affect the heat transfer inside and outside the boiler heating surface, increase the exhaust gas temperature, and reduce the thermal efficiency of the boiler. At the same time, dust accumulation will also cause high and low temperature corrosion on the heating surface, and boiler tubes will frequently burst and leak. In severe cases, the boiler may even be forced to stop for cleaning and tube burst, which greatly shortens the operation cycle.

[0003] At present, a steam soot blower is generally used to purge the ash accumulated on the heating surface of the boiler tube bundle. The steam soot blower has an inner tube and an outer tube. The inner tube is stationary and mainly connects external steam to the outer tube. The outer tube rotates in a spiral manner while entering the furnace flue. The steam is ejected through the nozzle of the nozzle at the front end of the outer tube, thereby blowing the ash accumulated on the heating surface of the boiler tube bundle.

[0004] However, the inner and outer tubes of the existing soot blower are in an empty sleeve relationship. When the soot blower is in operation, the inner tube is bent and deformed under its own gravity, and the inner tube sags and contacts and rubs against the inner wall of the outer tube, causing wear. The inner tube needs to be maintained and replaced, and the replacement cost of the inner tube is high. In addition, as the inner and outer tubes contact and wear, the misalignment between the two will become larger and larger, causing unstable operation of the soot blower. Utility Model Content

[0005] The utility model aims to provide a soot blower, which can reduce the replacement frequency of the inner pipe, save costs, and improve the stability of the soot blower operation.

[0006] The utility model provides a soot blower, comprising: an inner gas transmission tube, an outer purge tube and a buffer structure, wherein the inner gas transmission tube extends into the outer purge tube, the inner gas transmission tube is coaxial with the outer purge tube, at least one buffer structure is provided between the inner gas transmission tube and the outer purge tube, and each buffer structure is detachably mounted on the outer wall of the inner gas transmission tube.

[0007] Compared with the prior art, the soot blower provided by the utility model comprises an inner gas transmission tube, an outer purge tube and a buffer structure. Among them, the inner gas transmission tube extends into the outer purge tube, and the inner gas transmission tube is coaxial with the outer purge tube, so that the outer purge tube can move back and forth along the axial direction of the inner gas transmission tube, thereby extending into the boiler. At the same time, there is at least one buffer structure between the inner gas transmission tube and the outer purge tube, and each buffer structure is detachably mounted on the outer wall of the inner gas transmission tube. Therefore, on the one hand, when the soot blower is in operation, the buffer structure can be used to support the inner gas transmission tube, thereby avoiding the problem that the inner gas transmission tube sags and contacts and rubs against the inner wall of the purge tube, causing the wear of the inner gas transmission tube, and the purge tube directly wears the front end of the inner gas transmission tube during the rotation and left and right movement, causing the inner tube to be worn out and scrapped. On the other hand, the support of the buffer structure can avoid the problem that the misalignment of the inner gas transmission tube and the outer purge tube will become larger and larger as the inner gas transmission tube and the purge tube contact and wear, thereby improving the stability of the soot blower.

[0008] On this basis, since the buffer structure is detachably installed on the outer wall of the gas transmission inner pipe, when the soot blower has been running for a long time, if the buffer structure is severely worn or the maintenance personnel determine that continued use will affect the operating stability of the equipment, the buffer structure can be directly removed and replaced, thereby extending the service life of the soot blower inner pipe at an extremely low cost, greatly reducing the maintenance cost of the soot blower.

[0009] It can be seen from the above that the soot blower according to the embodiment of the utility model can reduce the replacement frequency of the inner tube, save costs, and improve the stability of the operation of the soot blower. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0011] Figure 1 It is a structural schematic diagram of a soot blower according to an exemplary embodiment of the utility model;

[0012] Figure 2 A side view of a sootblower according to an exemplary embodiment of the present invention;

[0013] Figure 3 It is a partial cross-sectional view of a sootblower according to an exemplary embodiment of the present invention.

[0014] Reference numerals:

[0015] 100-gas transmission inner pipe, 200-purge outer pipe, 300-buffer structure. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0019] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0020] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0021] During the operation of the boiler, the most common phenomenon is the accumulation of dust and coking on the heating surface. The thermal conductivity of the dust layer deposited on the heating surface of the boiler is 0.0581w / ㎡˙℃~0.116w / ㎡˙℃, while the thermal conductivity of the metal tube wall of the boiler heating surface is 46.5w / ㎡˙℃~58.1w / ㎡˙℃, and the thermal conductivity of the dust layer is 500~800 times lower than that of the metal tube wall. Therefore, in the case of mild dust accumulation, the additional thermal resistance brought by the dust layer will also seriously affect the heat transfer inside and outside the boiler heating surface, increase the exhaust gas temperature, and reduce the thermal efficiency of the boiler. At the same time, the dust accumulation further causes high and low temperature corrosion on the heating surface, and the boiler tube bursts and leaks frequently. In severe cases, the boiler is even forced to stop for cleaning and burst, which greatly shortens the operation cycle.

[0022] At present, steam soot blowers are generally used to purge the ash deposited on the heating surface of the boiler tube bundle. Steam soot blowers use steam as the blowing medium energy. Through the Venturi nozzle, almost 100% of the energy is converted into kinetic energy for purge, achieving nearly the best purge effect. At the same time, the super-large nozzle cross-section avoids high noise emissions and high pressure drop inside the soot blower. The structure of the long telescopic steam soot blowers currently used on the market is roughly the same, that is, the outer tube sleeve inner tube method is adopted. The inner tube is stationary and mainly connects the external steam to the outer tube. The outer tube rotates in a spiral manner while entering the furnace flue. The steam is ejected through the nozzle of the nozzle at the front end of the outer tube, thereby achieving the purging of the ash deposited on the heating surface of the boiler tube bundle. In order to improve the purge effect and reduce corrosion, each time the soot blower is operated, the soot blower retracts on a different spiral path. After the soot blowing is completed, the soot blowing outer tube is withdrawn from the furnace to avoid being burned by high-temperature flue gas.

[0023] However, the inner and outer tubes of the existing soot blower are in an empty sleeve relationship. The end of the inner tube is directly connected to the steam delivery pipeline through a spring valve, and the front end extends into the outer tube without other support points. When the soot blower is running, the inner tube is bent and deformed under its own gravity, drooping and contacting and rubbing with the inner wall of the outer tube, causing wear, requiring maintenance and replacement of the inner tube, and the replacement cost of the inner tube is high. In addition, as the inner and outer tubes contact and wear, the misalignment between the two will become larger and larger, causing unstable operation of the soot blower.

[0024] In view of the above problems, the embodiment of the utility model provides a soot blower to solve the problem in the prior art that when the soot blower is in operation, the inner tube sags under its own gravity and contacts and rubs against the inner wall of the outer tube, causing wear, and the inner tube replacement cost is high. The replacement frequency of the inner tube can be reduced, the cost can be saved, and the stability of the soot blower operation can be improved.

[0025] Figure 1 A structural schematic diagram of a soot blower according to an exemplary embodiment of the utility model is shown. Figure 2 A side view of a sootblower according to an exemplary embodiment of the present invention is shown. Figure 3A partial cross-sectional view of a soot blower according to an exemplary embodiment of the present invention is shown. Figures 1 to 3 As shown, the soot blower provided by the exemplary embodiment of the utility model includes an inner gas transmission pipe 100, an outer purge pipe 200 and a buffer structure 300. The inner gas transmission pipe 100 extends into the outer purge pipe 200, the inner gas transmission pipe 100 is coaxial with the outer purge pipe 200, and at least one buffer structure 300 is provided between the inner gas transmission pipe 100 and the outer purge pipe 200, and each buffer structure 300 is detachably mounted on the outer wall of the inner gas transmission pipe 100.

[0026] It is understandable that the above-mentioned buffer structure 300 is detachably mounted on the outer wall of the gas transmission inner tube 100, and the detachable mounting method can be threaded connection, pin connection, snap connection, key connection or other detachable connection methods, which are not limited here and can be selected according to actual needs. The number of buffer structures 300 can be one or more. When the number of buffer structures 300 is more than one, multiple buffer structures 300 can be arranged around the outer wall of the gas transmission inner tube 100 along the circumferential direction.

[0027] In specific implementation, since the gas transmission inner tube 100 extends into the purge outer tube 200, the gas transmission inner tube 100 is coaxial with the purge outer tube 200, and the purge outer tube 200 can move back and forth along the axial direction of the gas transmission inner tube 100, thereby extending into the boiler. At the same time, since there is at least one buffer structure 300 between the gas transmission inner tube 100 and the purge outer tube 200, each buffer structure 300 can be detachably mounted on the outer wall of the gas transmission inner tube 100. Therefore, on the one hand, when the soot blower is in operation, the gas transmission inner tube 100 can be supported by the buffer structure 300, thereby avoiding the gas transmission inner tube 100 being drooped and contacted and rubbed with the inner wall of the purge outer tube 200 to cause the wear of the gas transmission inner tube 100, and the purge outer tube 200 directly wears the front end of the gas transmission inner tube 100 during the rotation and left and right movement, resulting in the gas transmission inner tube 100 being worn out and scrapped. On the other hand, the support of the buffer structure 300 can prevent the soot blower from running unstably due to the increasing misalignment of the gas transmission inner pipe 100 and the purge outer pipe 200 as they come into contact and wear, thereby improving the stability of the soot blower.

[0028] On this basis, since the buffer structure 300 can be detachably installed on the outer wall of the gas transmission inner pipe 100, when the soot blower has been running for a long time, if the buffer structure 300 is severely worn or the maintenance personnel determine that continued use will affect the operating stability of the equipment, the buffer structure 300 can be directly removed and replaced, thereby extending the service life of the soot blower inner pipe at an extremely low cost, greatly reducing the maintenance cost of the soot blower.

[0029] In an optional manner, the length of the purge outer tube 200 of the embodiment of the utility model is greater than the length of the gas transmission inner tube 100, the gas transmission inner tube 100 is used to transport steam to the purge outer tube 200, and the purge outer tube 200 is used to use steam to purge the ash accumulated in the boiler. Therefore, external steam can enter the soot blower through the gas transmission inner tube 100, and since the length of the purge outer tube 200 is greater than the length of the gas transmission inner tube 100, steam can enter the purge outer tube 200 through the gas transmission inner tube 100, and then the purge outer tube 200 is extended into the boiler to use steam to purge the ash accumulated in the boiler, thereby achieving the purpose of soot blowing.

[0030] Exemplarily, the buffer structure 300 of the embodiment of the utility model is an arc-shaped buffer structure, and the arc-shaped buffer structure is coaxial with the gas transmission inner tube 100 and the purge outer tube 200. It should be understood that the center of the arc-shaped buffer structure is concentric with the gas transmission inner tube 100 and the purge outer tube 200. The arc-shaped buffer structure is set to be coaxial and concentric with the gas transmission inner tube 100 and the purge outer tube 200, which can facilitate the connection of the arc-shaped buffer structure to the outer wall of the gas transmission inner tube 100.

[0031] In one example, the width of the arc-shaped buffer structure of the embodiment of the utility model is 15 mm to 25 mm, preferably 20 mm, the thickness of the arc-shaped buffer structure is 3 mm to 7 mm, preferably 5 mm, and the curvature of the arc-shaped buffer structure is 120°.

[0032] In practical applications, compared with the existing sootblower inner tube and outer tube that are easy to contact, the width of the arc-shaped buffer structure in the embodiment of the utility model is set to 15mm-25mm, which can greatly reduce the contact surface between the gas transmission inner tube 100 and the purge outer tube 200, thereby reducing the friction on the gas transmission inner tube 100 and the purge outer tube 200. At the same time, the arc-shaped buffer structure plays a relative supporting role, and its thickness can reduce the misalignment of the gas transmission inner tube 100 and the purge outer tube 200. The reduction in contact area and the improvement in coaxiality greatly reduce the resistance of the sootblower sports car when it moves forward and backward and the wear of the packing seal of the sootblower inner tube, thereby reducing the maintenance cost caused by replacing the packing or the gas transmission inner tube.

[0033] In an optional manner, the gas transmission inner tube 100 provided in the embodiment of the utility model has a first end and a second end, and the gas transmission inner tube 100 is used to transport steam from the first end to the second end, and the arc-shaped buffer structure is located on the outer wall of the gas transmission inner tube 100 close to the second end. It should be understood that the first end of the gas transmission inner tube 100 can be defined as the steam input end of the gas transmission inner tube, and the second end can be defined as the steam output end of the gas transmission inner tube. Providing the arc-shaped buffer structure on the outer wall of the gas transmission inner tube 100 close to the second end, that is, close to the steam output end, can ensure that the entire gas transmission inner tube 100 and the purge outer tube 200 will not directly contact each other, reduce the misalignment of the gas transmission inner tube 100 and the purge outer tube, and improve the stability of the soot blower.

[0034] For example, the wear resistance of the material of the buffer structure 300 and the material of the gas transmission inner tube 100 in the embodiment of the utility model are both lower than the wear resistance of the material of the purge outer tube. For example, the material of the purge outer tube 200 can be set to carbon steel, and the material of the gas transmission inner tube 100 and the buffer structure 300 can be set to stainless steel.

[0035] In one example, a spring member is provided on one side of the buffer structure 300 of the embodiment of the utility model close to the purge outer tube 200, and the spring member abuts against the purge outer tube 200. The provision of the spring member can increase the buffer effect between the buffer structure 300 and the purge outer tube 200, so that the friction between the purge outer tube 200 and the buffer structure 300 is reduced, and the wear speed of the purge outer tube 200 is slowed down.

[0036] Exemplarily, the soot blower of the embodiment of the utility model further comprises a linear drive device for providing driving force to the purge outer tube 200 and a rotary drive device for providing rotational force to the purge outer tube 200. During the gas discharge operation, the linear drive device can be used to drive the purge outer tube 200 to extend into and out of the boiler, and the rotary drive device can be used to drive the purge outer tube 200 to rotate around the gas transmission inner tube.

[0037] As can be seen from the above, the soot blower provided by the embodiment of the utility model can be moved back and forth along the axial direction of the gas transmission inner pipe, so as to extend into the boiler. At the same time, on the one hand, when the soot blower is in operation, the gas transmission inner pipe can be supported by the buffer structure, so as to avoid the gas transmission inner pipe sagging and contacting and rubbing with the inner wall of the purge outer pipe, causing the gas transmission inner pipe to wear, and the purge outer pipe directly wearing the front end of the gas transmission inner pipe during the rotation and left and right movement, causing the inner pipe to be worn out and scrapped. On the other hand, the support of the buffer structure can avoid the problem of unstable operation of the soot blower caused by the increasing misalignment of the gas transmission inner pipe and the purge outer pipe as the two contact and wear, thereby improving the stability of the soot blower.

[0038] On this basis, when the sootblower has been running for a long time, if the buffer structure is severely worn or the maintenance personnel determine that continued use will affect the operating stability of the equipment, the buffer structure can be directly removed and replaced, thereby extending the service life of the sootblower inner tube at an extremely low cost, greatly reducing the maintenance cost of the sootblower.

[0039] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0040] The above is only a specific implementation of the utility model. Obviously, various modifications and combinations can be made to it without departing from the spirit and scope of the utility model. Accordingly, this specification and the drawings are only exemplary illustrations of the utility model defined by the attached claims, and are deemed to have covered any and all modifications, changes, combinations or equivalents within the scope of the utility model. Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and their equivalents, the utility model is intended to include these changes and variations. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be covered within the scope of protection of the utility model. Therefore, the scope of protection of the utility model shall be based on the scope of protection of the claims.

Claims

1. A soot blower, characterized in that: include: An inner gas transmission tube, an outer purge tube and a buffer structure, wherein the inner gas transmission tube extends into the outer purge tube, the inner gas transmission tube is coaxial with the outer purge tube, at least one buffer structure is provided between the inner gas transmission tube and the outer purge tube, and each buffer structure is detachably mounted on the outer wall of the inner gas transmission tube.

2. The sootblower according to claim 1, characterized in that: The length of the purge outer pipe is greater than that of the gas transmission inner pipe. The gas transmission inner pipe is used to transport steam to the purge outer pipe. The purge outer pipe is used to purge ash accumulated in the boiler with steam.

3. The sootblower according to claim 1, characterized in that: The buffer structure is an arc-shaped buffer structure, and the arc-shaped buffer structure is coaxial with the gas transmission inner pipe and the purge outer pipe.

4. The sootblower according to claim 3, characterized in that: The width of the arc-shaped buffer structure is 15 mm to 25 mm, the thickness of the arc-shaped buffer structure is 3 mm to 7 mm, and the curvature of the arc-shaped buffer structure is 120°.

5. The sootblower according to claim 3, characterized in that: The inner gas transmission pipe has a first end and a second end. The inner gas transmission pipe is used to transmit steam along the first end to the second end. The arc-shaped buffer structure is located on the outer wall of the inner gas transmission pipe close to the second end.

6. The sootblower according to claim 1, characterized in that: The wear resistance of the buffer structure and the wear resistance of the gas transmission inner pipe are both lower than the wear resistance of the purge outer pipe.

7. The sootblower according to claim 6, characterized in that: The material of the purge outer tube is carbon steel, and the material of the gas transmission inner tube and the buffer structure are both stainless steel.

8. The sootblower according to any one of claims 1 to 7, characterized in that: A spring component is provided on one side of the buffer structure close to the purge outer tube, and the spring component abuts against the purge outer tube.

9. The sootblower according to any one of claims 1 to 7, characterized in that: The soot blower further comprises a linear drive device for providing a driving force to the purge outer tube and a rotation drive device for providing a rotational force to the purge outer tube.

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