CN219712313U - Furnace bottom sealing structure - Google Patents
Furnace bottom sealing structure Download PDFInfo
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- CN219712313U CN219712313U CN202222523962.8U CN202222523962U CN219712313U CN 219712313 U CN219712313 U CN 219712313U CN 202222523962 U CN202222523962 U CN 202222523962U CN 219712313 U CN219712313 U CN 219712313U
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- water
- plug
- piece
- sealing
- insert
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- 238000007789 sealing Methods 0.000 title claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 239000002893 slag Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000008602 contraction Effects 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 239000013049 sediment Substances 0.000 claims description 2
- 239000004576 sand Substances 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 13
- 230000008021 deposition Effects 0.000 abstract description 5
- 238000005336 cracking Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The utility model discloses a furnace bottom sealing structure, which comprises: the lower insert is formed into an annular plate and is fixedly arranged at the top of the slag hopper; the upper plug-in component is formed into an annular groove part capable of accommodating the lower plug-in component, the annular groove part is fixedly arranged at the bottom of the water-cooled wall, the upper plug-in component is in plug-in fit with the lower plug-in component in the expansion and contraction process of the water-cooled wall, and a closed space is formed between the slag hopper and the water-cooled wall. According to the utility model, the upper plug-in, the lower plug-in and the sealing element are arranged, so that the sealing effect basically consistent with that of the water sealing structure in the prior art is realized, and the sealing effect of the upper plug-in and the lower plug-in can be further improved. The upper plug-in unit, the lower plug-in unit and the sealing element are combined, so that the water seal structure and the sand seal structure in the prior art can be replaced, and a series of problems that the water seal plug board is seriously deformed due to ash deposition in the water seal groove and the downward expansion resistance of the water seal plug board, or the plug board of the sand seal structure is easily deformed and the like are avoided.
Description
Technical Field
The utility model relates to the technical field of boilers, in particular to a furnace bottom sealing structure.
Background
At present, the sealing between the boiler water-cooling wall and the slag hopper of each thermal power plant is mostly sealed by adopting a water seal inserting plate, and the reason for arranging the water seal inserting plate is as follows: after the ignition of the boiler is started, the water-cooled wall is heated and expanded, and for a 145MW pulverized coal boiler, the length of the water-cooled wall is extended by 260mm under the full load of the boiler compared with the length of the water-cooled wall under the cold state, and the length of the water-cooled wall changes along with the change of temperature. The slag hopper positioned at the lower part of the water wall is fixed on the ground, and the distance between the slag hopper and the water wall can be changed along with the change of the wall temperature of the water wall. In the running process of the unit, a gap for ensuring the downward expansion of the water-cooling wall is required between the slag hopper and the water-cooling wall, and air cannot enter the gap, and a furnace bottom water seal groove arranged between the water-cooling wall and the slag hopper ensures the sealing in the expansion process of the water-cooling wall, so that the tightness of a dynamic and static joint at the lower part of a hearth is maintained, and air leakage is prevented.
However, ash enters the water seal tank in the operation of the furnace bottom water seal, ash deposition in the water seal tank is easy to occur, the water seal plugboard is blocked by downward expansion, the water seal plugboard is seriously deformed, and even the unplanned shutdown accident of the unit is caused by cracking of a water wall suspension welding seam. On the other hand, after the inside of the furnace bottom water seal tank is blocked, the filled sealing water overflows from the outside of the furnace bottom water seal tank, so that the pollution of a boiler room and other equipment is serious.
Meanwhile, in order to save water resources, the existing water seal tank generally adopts slag flushing water of a slag removal system, and the water contains more fine slag and is easy to precipitate in the water seal tank and the inner wall of the water seal pipeline, so that the water seal tank is scaled and blocked by a water pipe, and when the water pipe is seriously blocked, the water seal is deficient, and the sealing effect of the water seal at the bottom of the furnace is directly lost.
In addition, at present, some power plants change a furnace bottom water seal system into sand seal, namely light sand is used for replacing slag water, so that a large amount of water for water seal is saved, and the water seal system is effective from the aspect of water saving, but after the light sand is used for a period of time, the hardening phenomenon is easy to occur, and the light sand is easy to be adhered to an inserting plate in the process of stopping a boiler; in the starting process of the boiler, the water seal plugboard also bears great resistance when being inserted downwards, so that the plugboard board is deformed, and the problem of poor sealing occurs.
Disclosure of Invention
In view of the above, it is necessary to provide a furnace bottom sealing structure.
The furnace bottom sealing device comprises a slag hopper, a boiler and a water cooling wall, and further comprises:
the lower insert is formed into an annular plate and is fixedly arranged at the top of the slag hopper;
the upper plug-in component is formed into an annular groove part capable of accommodating the lower plug-in component, the annular groove part is fixedly arranged at the bottom of the water-cooled wall, the upper plug-in component is in plug-in fit with the lower plug-in component in the expansion and contraction process of the water-cooled wall, and a closed space is formed between the slag hopper and the water-cooled wall.
In some embodiments, the hearth sealing structure further comprises:
the sealing piece is arranged around the upper plug-in piece and the lower plug-in piece, is made of flexible materials, and is in sealing connection with the water cooling wall and the slag hopper.
In some embodiments, the hearth sealing structure further comprises:
the limiting piece is fixed on the upper plug-in piece and penetrates through the lower plug-in piece, a sliding opening is formed in the lower plug-in piece along the vertical direction, and the limiting piece slides back and forth in the sliding opening in the expansion and contraction process of the water-cooled wall.
In some embodiments, the hearth sealing structure further comprises:
the slag blocking piece is arranged on one side, away from the sealing piece, of the upper plug-in piece and the lower plug-in piece, and is fixed at the bottom of the water cooling wall.
Compared with the prior art, the utility model has the beneficial effects that:
through setting up plug-in components and lower plug-in components, the water-cooling wall expansion and contraction in-process forms airtight space between sediment fill and the water-cooling wall, has realized the sealed effect unanimous basically with the water seal structure in prior art, secondly, through setting up the sealing member, can further improve the sealed effect of plug-in components and lower plug-in components. The upper plug-in unit, the lower plug-in unit and the sealing element are combined, so that the water seal structure and the sand seal structure in the prior art can be replaced, and a series of problems that the water seal plug board is seriously deformed due to ash deposition in the water seal groove and the downward expansion resistance of the water seal plug board, or the plug board of the sand seal structure is easily deformed and the like are avoided.
Drawings
FIG. 1 is a schematic vertical cross-section of an exemplary embodiment of the present utility model;
FIG. 2 is a vertical schematic diagram showing an upper board and a lower board according to an exemplary embodiment of the utility model;
fig. 3 is a schematic transverse diagram showing an upper board and a lower board according to an exemplary embodiment of the utility model.
In the figure: 1. a slag bucket; 2. a boiler; 3. a water cooling wall; 41. a lower plug-in; 411. a slide hole; 42. an upper insert; 43. a limiting piece; 5. a seal; 6. slag stopper.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
As described in the background art, the bottom sealing structure of the boiler in the prior art has two forms, one is a water sealing structure, and the other is a sand sealing structure.
In the water seal structure, ash residues enter the water seal tank in the running process of the furnace bottom water seal, ash residue deposition in the water seal tank is easy to occur, the water seal plugboard is blocked by downward expansion, the water seal plugboard is seriously deformed, and even the water wall suspension welding seam cracking is caused, so that the unit is not scheduled to stop running. On the other hand, after the inside of the furnace bottom water seal tank is blocked, the filled sealing water overflows from the outside of the furnace bottom water seal tank, so that the pollution of a boiler room and other equipment is serious. Meanwhile, in order to save water resources, the existing water seal tank generally adopts slag flushing water of a slag removal system, and the water contains more fine slag and is easy to precipitate in the water seal tank and the inner wall of the water seal pipeline, so that the water seal tank is scaled and blocked by a water pipe, and when the water pipe is seriously blocked, the water seal is deficient, and the sealing effect of the water seal at the bottom of the furnace is directly lost.
In the sand seal structure, the slag water is replaced by the light sand, so that a large amount of water for water seal is saved, and the water seal structure is effective from the aspect of water saving, however, after the light sand is used for a period of time, the hardening phenomenon is easy to occur, and the light sand is easy to be adhered to the plugboard in the boiler shutdown process; in the starting process of the boiler, the water seal plugboard also bears great resistance when being inserted downwards, so that the plugboard board is deformed, and the problem of poor sealing occurs.
To solve the above problems, the present utility model provides a furnace bottom sealing device, referring to fig. 1, which mainly includes: slag bucket 1, boiler 2, water-cooling wall 3, insert 41 down, insert 42, sealing member 5, locating part 43 and pushing off slag spare 6 down, with the slag bucket 1 in prior art, boiler 2 and water-cooling wall 3 set up the mode unanimously, slag bucket 1 is fixed to be set up in ground, and boiler 2 mouth is located slag bucket 1 directly over, and water-cooling wall 3 adheres to boiler 2 wall. The present utility model aims to achieve a sealing effect consistent with the water seal type structure and the sand seal type structure in the prior art and to avoid the problems existing in the prior art by providing the upper insert 42, the lower insert 41 and the sealing member 5.
Specifically, in the exemplary embodiment, the lower insert 41 is formed in an annular plate shape, and is disposed around the mouth of the slag bucket 1, and one side of the lower insert is welded and fixed to the top edge of the slag bucket 1, and the upper insert 42 is formed as an annular groove portion capable of accommodating the lower insert 41, and is fixedly disposed at the bottom of the water-cooled wall 3, so as to ensure that the lower insert 41 and the upper insert 42 are in reciprocal plugging fit during the expansion and contraction process of the water-cooled wall 3. Further, the upper insert 42 and the lower insert 41 are always connected during the deformation of the water wall 3, referring to fig. 2, in the schematic view, for convenience of display, a gap exists between the upper insert and the lower insert, but in the actual product, the gap does not exist, so that a closed space is formed between the slag bucket 1 and the water wall 3.
In other embodiments, the upper insert and the lower insert may be positioned in the same way, that is, the upper insert 41 is formed into an annular plate shape, and the lower insert 42 is formed into an annular groove portion capable of accommodating the upper insert 41, and also capable of meeting the sealing requirement, unlike the exemplary embodiment, the slag is easier to enter due to the upward arrangement of the notch of the annular groove portion, so the exemplary embodiment is a preferred embodiment.
In other embodiments, the upper insert 42 and the lower insert 41 may be made of wear-resistant steel, so as to prevent the sealing effect from being poor after long-term use.
Specifically, referring to fig. 1 and 2, in the exemplary embodiment, the limiting member 43 is disposed in the upper insert 42 to limit the relative movement direction of the upper insert 42 and the lower insert 41, wherein, referring to fig. 3, the lower insert 41 is provided with a sliding opening 411 along the vertical direction, and further, the limiting member 43 is formed in a rod shape and is fixedly disposed between two side groove walls in the groove of the upper insert 42. In the expansion and contraction process of the water-cooled wall 3, the limiting pieces 43 can slide back and forth in the sliding port. Further, the limiting pieces are arranged in the upper insert in a plurality of mode, so that the motion constraint effect of the upper insert on the lower insert is enhanced.
Specifically, in the exemplary embodiment, the sealing member 5 is formed in a ring shape, and is disposed around the upper insert 42 and the lower insert 41, and is made of a flexible material, and is used to connect the water wall 3 and the slag bucket 1 in a sealing manner. Further, the sealing element 5 comprises an inner liner layer made of high-temperature-resistant composite ceramic fiber cloth and an outer layer made of a high-temperature-resistant skin material, the inner liner layer and the outer layer are adhered by heat-resistant adhesive, the high-temperature-resistant composite ceramic fiber cloth can resist the temperature of 1200 ℃, and has excellent heat insulation effect, the inner liner layer of the sealing element 5 completely meets the use requirement, the outer layer adopts the high-temperature-resistant skin material, so that the sealing element not only has good sealing effect, but also can bear repeated shrinkage deformation for a long time without cracking, and the sealing of the furnace bottom is ensured to achieve zero leakage.
Specifically, in the exemplary embodiment, the slag blocking member 6 is disposed on a side of the upper insert 42 and the lower insert 41 facing away from the sealing member 5, which is formed in a ring-shaped plate shape, and one side thereof is fixed to the bottom of the water wall 3, and when the boiler 2 discharges ash, the slag blocking member 6 can block most of the ash from entering the positions of the upper insert 42 and the lower insert 41, so as to play a role in preventing the ash from being stuck to the upper insert 42 and the lower insert 41.
In summary, by arranging the upper insert 42 and the lower insert 41, a closed space is formed between the slag bucket 1 and the water-cooled wall 3 in the expansion and contraction process of the water-cooled wall 3, so that a sealing effect basically consistent with that of the water seal structure in the prior art is achieved, and secondly, by arranging the sealing element 5, the sealing effect of the upper insert 42 and the lower insert 41 can be further improved. The upper insert 42 and the lower insert 41 in the utility model are combined with the sealing piece 5, so that the water seal structure and the sand seal structure in the prior art can be replaced, and a series of problems that the water seal insert plate is seriously deformed due to ash deposition in the water seal groove and the downward expansion of the water seal insert plate is blocked, or the sand seal structure insert plate is easily deformed and the like are avoided.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (4)
1. The utility model provides a stove bottom seal structure, includes sediment fill (1), boiler (2) and water-cooling wall (3), its characterized in that still includes:
a lower insert (41) formed as an annular plate fixedly arranged on the top of the slag hopper (1);
the upper plug-in (42) is formed into an annular groove part capable of accommodating the lower plug-in (41), is fixedly arranged at the bottom of the water-cooled wall (3), and in the expansion and contraction process of the water-cooled wall (3), the upper plug-in (42) is in plug-in fit with the lower plug-in (41), and a closed space is formed between the slag hopper (1) and the water-cooled wall (3).
2. The hearth sealing structure of claim 1, further comprising:
the sealing piece (5) is arranged around the upper plug-in piece (42) and the lower plug-in piece (41), is made of flexible materials, and is in sealing connection with the water cooling wall (3) and the slag hopper (1).
3. The hearth sealing structure according to claim 1 or 2, characterized in that the hearth sealing structure further comprises:
the limiting piece (43) is fixed on the upper plug-in piece (42) and penetrates through the lower plug-in piece (41), a sliding opening is formed in the lower plug-in piece (41) along the vertical direction, and the limiting piece (43) slides back and forth in the sliding opening in the expansion and contraction process of the water cooling wall (3).
4. The hearth sealing structure according to claim 2, characterized in that the hearth sealing structure further comprises:
the slag blocking piece (6) is arranged on one side, away from the sealing piece (5), of the upper insert (42) and the lower insert (41), and is fixed at the bottom of the water-cooled wall (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222523962.8U CN219712313U (en) | 2022-09-22 | 2022-09-22 | Furnace bottom sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222523962.8U CN219712313U (en) | 2022-09-22 | 2022-09-22 | Furnace bottom sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219712313U true CN219712313U (en) | 2023-09-19 |
Family
ID=88000322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222523962.8U Active CN219712313U (en) | 2022-09-22 | 2022-09-22 | Furnace bottom sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219712313U (en) |
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2022
- 2022-09-22 CN CN202222523962.8U patent/CN219712313U/en active Active
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