CN110017472B - Anti-wear device for boiler - Google Patents
Anti-wear device for boiler Download PDFInfo
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- CN110017472B CN110017472B CN201910206843.XA CN201910206843A CN110017472B CN 110017472 B CN110017472 B CN 110017472B CN 201910206843 A CN201910206843 A CN 201910206843A CN 110017472 B CN110017472 B CN 110017472B
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- abrasion
- boiler
- wear
- roller
- wall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/107—Protection of water tubes
- F22B37/108—Protection of water tube walls
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The scheme relates to an anti-abrasion device for a boiler, which comprises a support and an anti-abrasion roller, wherein the support comprises a support rod and a shaft rod vertically arranged at the upper end of the support rod, and the anti-abrasion roller is sleeved on the shaft rod; the outer wall of the anti-abrasion roller is provided with wing plates which are uniformly arranged, the shortest distance between every two wing plates is not less than 40mm, and the wing plates and the axis of the anti-abrasion roller form an included angle of 0-20 degrees; the anti-abrasion roller forms a linear or planar protective layer, most solid granular fuels can directly impact on the anti-abrasion roller, and effective protection is formed on the vulnerable part of an economizer or a membrane water-cooled wall; wind in the boiler generates thrust on wing plates on the anti-abrasion roller to push the anti-abrasion roller to rotate, so that all parts of the anti-abrasion roller can be impacted and uniformly abraded, and the service life of the anti-abrasion roller is prolonged; the abrasion-proof roller can be detached and replaced, is convenient to overhaul and maintain, and reduces the use cost of the boiler.
Description
Technical Field
The invention belongs to the technical field of boiler damage prevention, and particularly relates to an anti-wear device for a boiler.
Background
Operation practices show that the wear of the economizer is the most serious in four main convection heating surfaces of the superheater, the reheater, the economizer and the preheater of the boiler system.
To prevent slagging and to facilitate handling, superheater coils are typically arranged in series. The tubes of the tube bundle arranged in the row, after the second row, are in the shadow area of the flue gas flow, and the wear is usually lighter than the staggering. The flue gas temperature at the superheater is higher, and the ash particles in the flue gas are relatively soft, so the wear of the superheater tubes is not serious.
The tubular preheater of the coal-fired boiler is usually vertically arranged, the flow of the flue gas in the tube belongs to longitudinal scouring, and the abrasion of the rest parts of the tube is light except that the local abrasion is serious at the position of the tube inlet with 2-3 times of the tube diameter.
The economizer tubes are usually staggered, the flue gas has stronger scouring to staggered tube bundles, the abrasion is much more serious than that of the staggered tube bundles, the temperature of the flue gas at the economizer is lower, and the ash particles in the flue gas are relatively hard. These two factors make the economizer wear much more severe than the superheater and preheater. Effective wear protection is therefore required for economizer tubes, whereas superheater tubes are generally not.
In addition, the inner wall of the boiler is often a membrane water-cooled wall, which is formed by welding flat steel and a tube into an airtight tube panel. The membrane type water-cooled wall can ensure that the hearth has good tightness, the air leakage coefficient of the hearth can be obviously reduced for the negative pressure boiler, and the combustion working condition in the boiler is improved. It can increase the effective radiation heating area, thereby saving steel consumption.
From the fluid dynamic characteristics and fluidization theory of solid fuel particles in a boiler system, the water-cooling initial section or the water-cooling final section of the membrane water-cooling wall is easily impacted by the solid fuel particles to cause abrasion. The existing anti-abrasion technology of the anti-abrasion plate can damage the flow velocity and the flow direction of solid fuel particles so as to play a good anti-abrasion effect, but influences the heat exchange of a heated surface to a certain extent and influences the boiler efficiency, and possibly causes the accumulation of fuel on the anti-abrasion plate so as to influence the combustion and heat transfer efficiency; the high-temperature spraying anti-abrasion technology needs a large amount of capital investment, is short in service life, causes local abrasion after falling off, and possibly causes pipe explosion if the pipe cannot be overhauled and maintained in time.
The abrasion of the membrane water wall pipe is a bottleneck which restricts the long-period safe and economic operation of the boiler, if the condition is not taken into consideration, the irretrievable result can be caused, the membrane water wall pipe is abraded to enable the pipe wall to be wholly or locally thinned, so that serious potential safety hazard is formed, the water wall pipe is replaced locally or in a large area, the economic cost is increased, the construction period is delayed, and potential safety hazard and economic loss are caused to the society and users.
In view of the above, there is a need for an abrasion prevention device with a simple structure, which can effectively reduce or prevent abrasion and ensure long-term safe operation of the circulating boiler.
Disclosure of Invention
The invention aims to provide an anti-abrasion device for a boiler, which has a simple structure and can effectively reduce or prevent abrasion.
Another object of the present invention is to provide a wear prevention device for a boiler which is removably replaceable.
In order to solve the technical problem, the invention discloses an anti-abrasion device for a boiler, which is arranged in the boiler and comprises a support and an anti-abrasion roller, wherein the support comprises a support rod and a shaft rod vertically arranged at the upper end of the support rod, and the anti-abrasion roller is sleeved on the shaft rod;
the outer wall of the anti-abrasion roller is provided with 3-6 wing plates, the shortest distance between every two wing plates is not less than 40mm, and the wing plates and the axis of the anti-abrasion roller form an included angle of 0-20 degrees; the wing plate obtains power under the impact of airflow and particles in the boiler and drives the anti-abrasion roller to rotate along the shaft lever;
the outer wall of the shaft lever is provided with a plurality of wear-resistant bulges, and the wear-resistant bulges are contacted with the inner wall of the wear-resistant roller;
the materials of the anti-abrasion roller and the wing plate are tungsten alloy with the hardness of more than 90 HRA.
Preferably, the wing plate is a straight plate or a curved plate.
Preferably, the wing plate and the anti-wear roller are integrally formed or fixedly installed on the outer wall of the anti-wear roller.
Preferably, the lower end of the support rod is welded and fixed at a vulnerable part of the economizer or the membrane water-cooled wall, and the anti-abrasion roller is arranged facing the air outlet direction in the boiler.
Preferably, the shaft rod is a straight rod or a curved rod which is adaptive to the radian of the inner wall of the boiler.
Preferably, each shaft is sleeved with one or more anti-wear rollers.
Preferably, two ends of the shaft rod are provided with limiting devices.
Preferably, the wear drum is removable.
Preferably, the support rod is provided with an anti-wear coating.
Preferably, the material used for the anti-abrasion roller and the wing plate comprises one of tungsten-cobalt alloy, tungsten-nickel alloy and tungsten-titanium-cobalt alloy.
The abrasion-proof device for the boiler at least has the following advantages:
1. the plurality of anti-abrasion rollers form a linear or planar protective layer, most of solid particle fuel can directly collide against the anti-abrasion rollers, and the vulnerable part of the economizer or the membrane water-cooled wall is effectively protected.
2. Wind in the boiler generates thrust to wing plates on the anti-abrasion roller to push the anti-abrasion roller to rotate, so that all parts of the anti-abrasion roller can be impacted and abraded uniformly, and the service life of the anti-abrasion roller is prolonged.
3. The abrasion-proof roller can be detached and replaced, is convenient to overhaul and maintain, and reduces the use cost of the boiler.
Drawings
Fig. 1 is a schematic structural view of an abrasion prevention device for a boiler.
Fig. 2 is a schematic structural view of another abrasion prevention device for a boiler.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
As shown in fig. 1, an anti-abrasion device for a boiler is arranged in the boiler and comprises a support and an anti-abrasion roller 1, wherein the support comprises a support rod 2 and a shaft rod 3 vertically arranged at the upper end of the support rod, and the anti-abrasion roller 1 is sleeved on the shaft rod 3;
the outer wall of the anti-abrasion roller 1 is provided with 3-6 wing plates 4 which are uniformly arranged, the shortest distance between every two wing plates is not less than 40mm, and the wing plates 4 and the axis of the anti-abrasion roller 1 form an included angle of 0-20 degrees; the impact of wind or high-speed particles in the boiler can generate thrust on the wing plates which are obliquely arranged, so that the wing plates 4 passively obtain power under the impact of airflow and particles in the boiler and drive the anti-abrasion roller to rotate along the shaft rod;
a plurality of wear-resistant protrusions (not shown in the figure) are arranged on the outer wall of the shaft lever 3, and the wear-resistant protrusions are in contact with the inner wall of the wear-resistant roller 1; the long-term rotation of the anti-abrasion roller can damage the shaft lever, and the replacement and maintenance of the shaft lever are more troublesome than those of the anti-abrasion roller, so that the outer wall of the shaft lever is additionally provided with the anti-abrasion protrusions, and the service life of the shaft lever can be prolonged.
The materials of the anti-abrasion roller and the wing plate are tungsten alloy with the hardness of more than 90 HRA. Because the impact kinetic energy of the combustion particles in the boiler is smaller, and the hardness of the combustion particles at high temperature is smaller, the problem of toughness of materials of an anti-abrasion roller and a wing plate does not need to be considered, and the high-hardness tungsten steel is adopted.
The wing plate 4 is a straight plate or a curved plate.
The wing plate 4 and the anti-abrasion roller are integrally formed or are fixedly installed on the outer wall of the anti-abrasion roller. The embodiment is a processing mode of integrally forming the wing plate and the anti-abrasion roller.
The lower end of the support rod 2 is welded and fixed at a vulnerable part of an economizer or a membrane water-cooled wall, and the anti-abrasion roller 1 is arranged facing the air outlet direction in the boiler. Solid fuel particles are carried in the air outlet direction of the boiler, the impact of the solid fuel particles is the main reason for the damage of the economizer or the membrane water-cooled wall, and the anti-abrasion roller is arranged at the vulnerable part of the economizer or the anti-abrasion roller against the wind, so that the vulnerable part is effectively protected.
The shaft lever 3 is a straight lever. The plurality of anti-abrasion rollers form a planar protection layer, so that overall and effective protection is realized.
And limiting devices 5 are arranged at two ends of the shaft lever 3 to prevent the abrasion-proof roller from falling off.
The anti-abrasion roller 1 is detachable. The limiting device is removed, and the abrasion-proof roller can be conveniently replaced.
And the support rod is provided with an anti-abrasion coating. The support rod is not protected by the anti-abrasion roller and is possibly damaged to a certain extent, and an anti-abrasion coating needs to be arranged on the surface of the support rod to prolong the service life.
Example 2
As shown in fig. 2, similar to example 1, the difference is that the shaft 3 is a curved rod adapted to the curvature of the inner wall of the boiler. The plurality of anti-abrasion rollers 1 are sleeved on the shaft rod to form a surface shape or a linear shape arranged along the circumference of the inner wall of the membrane water-cooling wall, so that comprehensive and effective protection is formed.
Each shaft lever 3 is sleeved with a plurality of anti-abrasion rollers 1. When the axostylus axostyle is the curved bar, decompose into a plurality of little abrasionproof cylinders with the radian of adaptation curved bar with the abrasionproof cylinder, in addition, when the maintenance overhauls, can be to wearing and tearing more serious among a plurality of abrasionproof cylinders carry out the selectivity and change to reduce the maintenance cost.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (10)
1. An anti-abrasion device for a boiler is arranged in the boiler and is characterized by comprising a support and an anti-abrasion roller, wherein the support comprises a support rod and a shaft rod vertically arranged at the upper end of the support rod, and the anti-abrasion roller is sleeved on the shaft rod;
the outer wall of the anti-abrasion roller is provided with 3-6 wing plates, the shortest distance between every two wing plates is not less than 40mm, and the wing plates and the axis of the anti-abrasion roller form an included angle of 0-20 degrees; the wing plate obtains power under the impact of airflow and particles in the boiler and drives the anti-abrasion roller to rotate along the shaft lever;
the outer wall of the shaft lever is provided with a plurality of wear-resistant bulges, and the wear-resistant bulges are contacted with the inner wall of the wear-resistant roller;
the materials of the anti-abrasion roller and the wing plate are tungsten alloy with the hardness of more than 90 HRA.
2. The wear prevention device for a boiler of claim 1, wherein the wing plate is a straight plate or a curved plate.
3. The wear prevention device for a boiler of claim 2, wherein the wing plates are integrally formed with the wear drum or are fixedly mounted on the outer wall of the wear drum.
4. The abrasion prevention device for a boiler according to claim 3, wherein the lower ends of the support rods are welded and fixed to vulnerable parts of an economizer or a membrane water wall, and the abrasion prevention drum is arranged facing the air outlet direction in the boiler.
5. The wear prevention device for boiler of claim 4, wherein the shaft is a straight rod or a curved rod adapted to the curvature of the inner wall of the boiler.
6. The wear apparatus of claim 5, wherein each shaft is sleeved with one or more wear rollers.
7. The wear prevention device for a boiler of claim 6, wherein a limiting device is installed at both ends of the shaft.
8. The wear assembly of claim 7, wherein the wear drum is removable.
9. The wear prevention device for a boiler of any one of claims 1 to 8, wherein the support rods are provided with a wear prevention coating.
10. The wear apparatus of claim 9, wherein the wear drum and wing plate are made of a material selected from the group consisting of tungsten-cobalt, tungsten-nickel, and tungsten-titanium-cobalt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910206843.XA CN110017472B (en) | 2019-03-20 | 2019-03-20 | Anti-wear device for boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910206843.XA CN110017472B (en) | 2019-03-20 | 2019-03-20 | Anti-wear device for boiler |
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| Publication Number | Publication Date |
|---|---|
| CN110017472A CN110017472A (en) | 2019-07-16 |
| CN110017472B true CN110017472B (en) | 2020-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910206843.XA Active CN110017472B (en) | 2019-03-20 | 2019-03-20 | Anti-wear device for boiler |
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| CN (1) | CN110017472B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550818A (en) * | 2020-06-10 | 2020-08-18 | 安徽池州九华发电有限公司 | Boiler afterbody flue wear proof device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4124068A (en) * | 1977-05-16 | 1978-11-07 | Uop Inc. | Heat exchange tube for fluidized bed reactor |
| US4619314A (en) * | 1983-08-05 | 1986-10-28 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Device for preventing wear of heat transfer tubes in fluidized-bed boiler |
| JP2004019965A (en) * | 2002-06-12 | 2004-01-22 | Babcock Hitachi Kk | Fluidized bed combustion device |
| JP4807076B2 (en) * | 2005-12-28 | 2011-11-02 | Ｄｏｗａテクノロジー株式会社 | Heat transfer tube, heat transfer tube manufacturing method, and fluidized bed furnace |
| EP2821697B1 (en) * | 2012-02-13 | 2018-12-19 | Ebara Environmental Plant Co., Ltd. | In-bed heat transfer tube for fluidized bed boiler |
| JP6255011B2 (en) * | 2013-04-24 | 2017-12-27 | 荏原環境プラント株式会社 | Heat transfer tube in fluidized bed boiler and fluidized bed boiler |
| CN205640982U (en) * | 2016-05-18 | 2016-10-12 | 中国大唐集团科学技术研究院有限公司 | Boiler water wall pipe with abrasionproof explosion -proof ability |
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| CN110017472A (en) | 2019-07-16 |
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