CN211925736U - Wear-resistant structure and circulating fluidized bed boiler - Google Patents
Wear-resistant structure and circulating fluidized bed boiler Download PDFInfo
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- CN211925736U CN211925736U CN202020317621.3U CN202020317621U CN211925736U CN 211925736 U CN211925736 U CN 211925736U CN 202020317621 U CN202020317621 U CN 202020317621U CN 211925736 U CN211925736 U CN 211925736U
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Abstract
The utility model relates to a boiler abrasionproof technical field discloses an abrasionproof structure and circulating fluidized bed boiler. The anti-abrasion structure is used for a circulating fluidized bed boiler, a hearth of the boiler comprises a water cooling area and an unburned area which are arranged up and down, the anti-abrasion structure comprises an annular boss, the annular boss is coaxially arranged in the hearth and is positioned at the junction of the water cooling area and the unburned area, the cross section of the annular boss is a quadrangle with a top edge, a bottom edge, an outer side edge and an inner side edge, the width W1 of the top edge is larger than the width W2 of the bottom edge, the inner side edge is an arc which is concave towards the outer side edge, the outer peripheral surface of the annular boss corresponding to the outer side edge is formed into a mounting surface, and the inner peripheral surface of the annular boss corresponding to the inner side edge is formed into a flow guide surface. The utility model discloses an abrasion-proof structure can effectively reduce the wearing and tearing of boiler water wall when being applied to circulating fluidized bed boiler, extension boiler life cycle.
Description
Technical Field
The utility model relates to a boiler abrasionproof technical field specifically relates to an abrasionproof structure and circulating fluidized bed boiler including this abrasionproof structure.
Background
The circulating fluidized bed boiler is a novel combustion device developed in China in recent years, and the development of the circulating fluidized bed combustion technology is more rapidly advanced by the high efficiency and low pollution high performance. Circulating fluidized bed boilers have become currently the most promising combustion equipment today with increasingly stringent environmental requirements. But circulating fluidized bed boilers are subject to more severe wear than other boilers.
The common abrasion of the boiler is various changes caused by high-speed ash particles from different angles to impact a heating surface, and the abrasion quantity is in direct proportion to the 3.22 th power of the smoke velocity and is increased along with the increase of the concentration of the ash particles. Because the circulating fluidized bed boiler adopts a fluidized combustion mode, coal particles in the hearth move in the hearth in the form of particle clusters, and wall surface flow (namely solid materials flowing downwards along the wall surface of the hearth) and central flow (namely solid materials moving upwards in the hearth) in the hearth can generate vortex flow to scour a water-cooled wall, so that the water-cooled wall is abraded to cause tube explosion, the operation period of the boiler is shortened, and the operation cost is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above-mentioned problem, provide an anti-abrasion structure and circulating fluidized bed boiler including this anti-abrasion structure, this anti-abrasion structure can effectively prevent water-cooling wall wearing and tearing.
In order to achieve the above object, an aspect of the present invention provides an anti-wear structure for a circulating fluidized bed boiler, a furnace of the boiler includes a water cooling area and an unburned area arranged from top to bottom, the anti-wear structure includes an annular boss, the annular boss is used for coaxial mounting in the furnace and is located the water cooling area with the juncture of the unburned area, the cross section of the annular boss is a quadrangle having a top edge, a bottom edge, an outer side edge and an inner side edge, the width W1 of the top edge is greater than the width W2 of the bottom edge, the inner side edge is towards the arc of the outer side edge concave recess, the annular boss with the outer peripheral surface that the outer side edge corresponds is formed into a mounting surface, the annular boss with the inner peripheral surface that the inner side edge corresponds is formed into a diversion surface.
Optionally, the difference between the width W1 of the top edge and the width W2 of the bottom edge is 30-50 mm.
Optionally, the bottom edge is a straight edge perpendicular to the axial direction of the annular boss.
Optionally, an angle α between a tangent of the inner side edge at its intersection with the base edge and the base edge is 40-60 °.
Optionally, the top edge is a straight edge arranged obliquely to the bottom edge, and the outer end of the top edge is higher than the inner end.
Optionally, the angle β between the top edge and the bottom edge is 15-30 °.
Optionally, the mounting face is configured to be mountable at a water wall fin of the boiler.
The utility model discloses another aspect provides a circulating fluidized bed boiler, the furnace of boiler is including the water-cooling district and the non-combustion area of arranging from top to bottom, install above in the furnace wear-resisting structure.
Optionally, the boiler comprises a cylindrical water wall for defining the water cooling zone and a conical water wall for defining the non-combustion zone, the conical water wall is coated with wear-resistant plastic, the annular boss is arranged to protrude from the bottom end of the cylindrical water wall, and the width W2 of the bottom edge is equal to the thickness of the wear-resistant plastic.
Optionally, the mounting surface of the annular boss is connected at a fin of the cylindrical water wall.
Through the technical scheme, when the anti-abrasion structure is applied to the circulating fluidized bed boiler, on one hand, the wall surface flow in the hearth (namely, solid materials flowing downwards along the wall surface of the hearth) can change the flowing direction at the annular boss, so that the smoke speed is reduced, the impact on a water cooling wall in an unburned region is avoided, the friction force on the water cooling wall can be reduced, and the water cooling wall is prevented from being abraded; on the other hand, the flow guide surface of the annular boss can guide the central flow (namely the solid material moving upwards in the hearth) to move towards the middle part of the hearth, so that the water wall of the water cooling area is prevented from being impacted to cause abrasion of the water wall, and meanwhile, the impact of the central flow on the annular boss can be reduced, and the service lives of the water wall and the annular boss are prolonged.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
FIG. 1 is a schematic view of a boiler according to the present invention;
FIG. 2 is a cross-sectional view of the ring boss of the present invention;
FIG. 3 is a partial schematic view of the connection between the annular boss and the water wall.
Description of the reference numerals
10-boiler, 11-water cooling zone, 12-non-combustion zone, 13-cylindrical water-cooling wall, 131-fin, 20-annular boss, 21-top edge, 22-bottom edge, 23-outer side edge and 24-inner side edge.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
In the present invention, unless otherwise specified, terms of orientation such as "upper, lower, top, bottom" are generally used to refer to the orientation shown in the drawings. "inner and outer" refer to the inner and outer contours of the respective component itself.
An aspect of the utility model provides an anti-wear structure for circulating fluidized bed boiler 10, boiler 10's furnace includes water-cooling district 11 and the unburned district 12 that arrange from top to bottom, anti-wear structure includes annular boss 20, annular boss 20 is used for coaxial arrangement in the furnace and be located water-cooling district 11 with the juncture in unburned district 12, annular boss 20's cross-section is for having topside 21, base 22, outside limit 23 and inboard side 24's quadrangle, the width W1 of topside 21 is greater than the width W2 of base 22, inboard side 24 is for the orientation the arc of outside limit 23 concave yield (refer to fig. 2), annular boss 20 with the outer peripheral face that outside limit 23 corresponds forms into the installation face, annular boss 20 with the inner peripheral face that inboard side 24 corresponds forms into the water conservancy diversion face.
In the foregoing, it can be understood that the top edge 21 of the quadrangle corresponds to the top surface of the annular boss 20, the bottom edge 22 corresponds to the bottom surface of the annular boss 20, the outer side edge 23 corresponds to the outer peripheral surface of the annular boss 20, the inner side edge 24 corresponds to the inner peripheral surface of the annular boss 20, the inner peripheral surface is an arc-shaped surface recessed toward the outer peripheral surface, and the arc-shaped surface is configured to guide the material in the hearth.
Through the technical scheme, when the anti-abrasion structure is applied to a circulating fluidized bed boiler, on one hand, the wall surface flow in the hearth (namely, solid materials flowing downwards along the wall surface of the hearth) can change the flowing direction at the annular boss 20, so that the flue gas speed is reduced, the impact on a water cooling wall in an unburned region is avoided, the friction force on the water cooling wall can be reduced, and the water cooling wall is prevented from being abraded; on the other hand, the flow guide surface of the annular boss 20 can guide the central flow (i.e. the solid material moving upwards in the furnace) to move towards the middle part of the furnace, so as to prevent the central flow from impacting the water wall of the water cooling zone to cause the water wall to be worn, and simultaneously reduce the impact of the central flow on the annular boss 20, thereby prolonging the service lives of the water wall and the annular boss 20.
Preferably, the difference between the width W1 of the top edge 21 and the width W2 of the bottom edge 22 of the annular protrusion 20 is 30-50mm (e.g., W1 is 120mm and W2 is 80 mm). The bottom side 22 is a straight side perpendicular to the axial direction of the annular boss 20, that is, the bottom surface of the annular boss 20 is a plane perpendicular to the axial direction of the annular boss 20. The angle alpha between the tangent of the inner side edge 24 at its intersection with the bottom edge 22 and the bottom edge 22 is 40-60 deg. (see fig. 2), for example alpha is 60 deg..
In addition, the top edge 21 is preferably a straight edge that is disposed obliquely to the bottom edge 22, and the outer end (i.e., the left end in FIG. 2) of the top edge 21 is higher than the inner end (i.e., the right end in FIG. 2). In this way, material is prevented from accumulating on the annular boss 20 to generate a vortex, thereby reducing water-cooled wall wear. Wherein the angle beta between the top edge 21 and the bottom edge 22 is preferably 15-30 deg., for example beta is 15 deg..
The utility model discloses in, annular boss 20 the installation face set up to can install in boiler 10's water-cooling wall fin department can guarantee the fastness of annular boss 20 installation like this.
The utility model discloses another aspect provides a circulating fluidized bed boiler, boiler 10's furnace includes water-cooling district 11 and the unburned district 12 of arranging from top to bottom, install above wear-resisting structure in the furnace.
Wherein, as shown in fig. 1, the boiler 10 comprises a cylindrical water-cooled wall 13 for defining the water-cooled zone 11 and a conical water-cooled wall for defining the non-combustion zone 12, the conical water-cooled wall is coated with a plastic wear-resistant material, the annular projection 20 is arranged to protrude from the bottom end of the cylindrical water-cooled wall 13, and the width W2 of the bottom edge 22 is equal to the thickness of the plastic wear-resistant material (i.e. the inner end of the bottom edge 22 is flush with the surface of the plastic wear-resistant material), and the mounting surface of the annular projection 20 is connected to the fin 131 of the cylindrical water-cooled wall 13 (see fig. 3).
In the above, the width W2 of the bottom side 22 of the annular boss 20 is equal to the thickness of the wear-resistant plastic, so that the impact of the central flow on the bottom surface of the annular boss 20 can be prevented, and the flow guiding effect of the flow guiding surface is improved.
In addition, it should be noted that the wear-resistant plastic is used for protecting the water wall and preventing the water wall from being worn. The wear-resistant plastic material preferably has a high thermal conductivity coefficient, and heat transfer of the water-cooled wall is prevented from being influenced.
In actual construction, the annular boss 20 can be used for keel formwork support by using a steel bar made of 316L material with the diameter of phi 8mm, pouring is carried out by using wear-resistant plastic, and the annular boss is used after being maintained for 24-48 hours. In order to prevent the annular boss 20 from falling off due to expansion, an expansion gap may be reserved for each length of the annular boss 20. The method can reduce the modification cost, save the modification time and has no influence on the internal circulation and the working condition of the boiler.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.
In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.
Claims (10)
1. An anti-wear structure is used for a circulating fluidized bed boiler (10), a hearth of the boiler (10) comprises a water cooling area (11) and an unburned area (12) which are arranged up and down, the anti-abrasion structure is characterized by comprising an annular boss (20), wherein the annular boss (20) is coaxially arranged in the hearth and is positioned at the junction of the water cooling area (11) and the non-combustion area (12), the section of the annular boss (20) is a quadrangle with a top edge (21), a bottom edge (22), an outer side edge (23) and an inner side edge (24), the width W1 of the top edge (21) is greater than the width W2 of the bottom edge (22), the inner side edge (24) is in the shape of an arc recessed towards the outer side edge (23), the outer peripheral surface of the annular boss (20) corresponding to the outer side edge (23) is formed as a mounting surface, the inner circumferential surface of the annular boss (20) corresponding to the inner side edge (24) is formed into a flow guide surface.
2. The wear structure of claim 1, wherein the difference between the width W1 of the top edge (21) and the width W2 of the bottom edge (22) is 30-50 mm.
3. The wear structure according to claim 1, wherein the bottom edge (22) is a straight edge perpendicular to the axial direction of the annular boss (20).
4. The wear structure according to claim 3, characterized in that the angle a between the tangent of the inner side edge (24) at its intersection with the bottom edge (22) and the bottom edge (22) is 40-60 °.
5. The wear structure according to claim 3, characterized in that the top edge (21) is a straight edge arranged obliquely to the bottom edge (22), and the outer end of the top edge (21) is higher than the inner end.
6. The wear structure according to claim 5, characterized in that the angle β between the top edge (21) and the bottom edge (22) is 15-30 °.
7. The wear structure according to any one of claims 1-6, characterized in that the mounting face is arranged to be mountable at a water wall fin of the boiler (10).
8. A circulating fluidized bed boiler, the furnace of which boiler (10) comprises a water cooling zone (11) and an unburnt zone (12) arranged one above the other, characterized in that a wear structure according to any one of claims 1-7 is mounted in the furnace.
9. A circulating fluidized bed boiler according to claim 8, characterized in that the boiler (10) comprises a cylindrical water wall (13) defining the water cooling zone (11) and a conical water wall defining the non-combustion zone (12), which conical water wall is coated with a wear resistant plastic, the annular projection (20) is arranged to protrude from the bottom end of the cylindrical water wall (13), and the bottom edge (22) has a width W2 equal to the thickness of the wear resistant plastic.
10. A circulating fluidized bed boiler according to claim 9, characterized in that the mounting face of the annular boss (20) is connected at fins (131) of the cylindrical water wall (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020317621.3U CN211925736U (en) | 2020-03-13 | 2020-03-13 | Wear-resistant structure and circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020317621.3U CN211925736U (en) | 2020-03-13 | 2020-03-13 | Wear-resistant structure and circulating fluidized bed boiler |
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| Publication Number | Publication Date |
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| CN211925736U true CN211925736U (en) | 2020-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020317621.3U Active CN211925736U (en) | 2020-03-13 | 2020-03-13 | Wear-resistant structure and circulating fluidized bed boiler |
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- 2020-03-13 CN CN202020317621.3U patent/CN211925736U/en active Active
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