CN219756349U - Protection device for circulating fluidized bed boiler - Google Patents

Abstract

The utility model relates to a protection device of a circulating fluidized bed boiler, which comprises a hearth, an air distribution plate, an air chamber, a slag dropping pipe and a protection mechanism, wherein the air distribution plate is arranged at the bottom of the hearth; the air chamber is arranged below the bottom of the hearth; the slag dropping pipe penetrates through the air chamber, one end of the slag dropping pipe is connected with the air distribution plate, and one end of the slag dropping pipe is communicated with the hearth; the protection mechanism is used for preventing the welding part of the slag and the slag falling pipe and the air distribution plate from contacting so as to prevent the welding part of the slag falling pipe and the air distribution plate from deforming and cracking. According to the protection device for the circulating fluidized bed boiler, the protection mechanism is arranged, so that high-temperature slag is prevented from contacting with the welding part of the slag falling pipe and the air distribution plate, deformation and cracking of the welding part of the slag falling pipe and the air distribution plate are prevented, the protection effect is achieved, air leakage and slag leakage are avoided, slag spraying is avoided, the operation safety of workers is improved, the slag falling pipe is prevented from being blocked, and the normal operation of the circulating fluidized bed boiler is ensured.

Description

Protection device for circulating fluidized bed boiler

Technical Field

The utility model relates to the technical field of circulating fluidized bed boilers, in particular to a protection device of a circulating fluidized bed boiler.

Background

The circulating fluidized bed boiler adopts clean coal combustion technology with highest industrialization degree, the circulating fluidized bed boiler adopts external circulating fluidized bed boiler coal burning technology with high efficiency, energy saving and low pollution, has the advantages of wide fuel adaptability, high combustion efficiency, high efficiency desulfurization, simple structure, convenient operation and the like,

as shown in fig. 1, in the circulating fluidized bed boiler in the prior art, slag is discharged in a solid state in the boiler, and the upper part of a slag falling pipe 3 (stainless steel pipe) is directly welded with a hearth air distribution plate. The boiler is in the high temperature state under the operating condition of the boiler, the temperature of slag is higher, the slag falling pipe 3 is always burnt to be red, overheated, heated and expanded, the welded part of the slag falling pipe and the air distribution plate 2 is deformed, cracked and falls off due to heated expansion, air leakage and slag leakage are caused, high-pressure air in the water-cooling air chamber 10 enters the slag falling pipe 3 through the welded junction cracking part, slag is sprayed in the pipe together with the slag, workers are easy to scald, the slag falling pipe 3 is blocked when the slag spraying is serious, the slag falling pipe is difficult to dredge, and when the slag falling pipe cannot be dredged, the bed pressure cannot be maintained. And because the welded junction between the slag falling pipe 3 and the water cooling pipe wall is cracked and worn due to thermal expansion, the water cooling wall pipe is easy to tear and leak, and finally, the water cooling wall pipe is forced to be shut down in an unplanned mode.

Disclosure of Invention

Therefore, it is necessary to provide a protection device for a circulating fluidized bed boiler in the prior art, be in the high temperature state under the boiler operating condition, the temperature of slag is higher, make the slag falling pipe often appear burning red, overheated, thermal expansion makes slag falling pipe and air distribution plate welded part deformation, fracture, drop, air leakage leak slag, the indoor high-pressure air of water cold wind gets into the slag falling pipe through welded junction fracture department, form the slag spray together with the slag in the intraductal, easy scald staff, cause slag falling pipe jam when the slag spray is serious, it is difficult to dredge the slag falling pipe, when unable mediation slag falling pipe, and then unable to maintain the bed pressure. And the welded junction between the slag falling pipe and the water cooling pipe wall is cracked and worn due to thermal expansion, so that the water cooling pipe is easy to tear and leak, and finally, the water cooling pipe is forced to be shut down in an unplanned mode.

To achieve the above object, the present inventors provide a guard device for a circulating fluidized bed boiler, comprising:

a furnace;

the air distribution plate is arranged at the bottom of the hearth;

the air chamber is arranged below the bottom of the hearth;

the slag dropping pipe penetrates through the air chamber, one end of the slag dropping pipe is connected with the air distribution plate, and one end of the slag dropping pipe is communicated with the hearth;

and the protection mechanism is used for preventing slag from contacting with the welding part of the slag falling pipe and the air distribution plate so as to prevent the welding part of the slag falling pipe and the air distribution plate from deforming and cracking.

As a preferable structure of the utility model, the protection mechanism comprises an outer sleeve, an inner sleeve and a protection component

The outer sleeve is wrapped and arranged on the periphery of the slag falling pipe, and the outer sleeve is connected with the outer wall of the slag falling pipe and the bottom of the air distribution plate;

the inner sleeve is nested and arranged on the inner wall of the slag falling pipe, a gap is reserved between the outer wall of the inner sleeve and the inner wall of the slag falling pipe, the slag falling pipe extends out of one end of the inner sleeve, which is close to the hearth, and one end of the inner sleeve, which is close to the hearth, is connected with the air distribution plate;

the protection part is arranged on the periphery of one end, close to the hearth, of the inner sleeve, and is used for wrapping and sealing one end, close to the hearth, of the inner sleeve and the air distribution plate.

As a preferable structure of the utility model, one end of the inner sleeve, which is close to the hearth, is provided with a protruding part, the protruding part extends outwards along the outer wall of the inner sleeve, and the protruding part is connected with the air distribution plate;

the protruding part and the inner sleeve are integrally formed; or (b)

The protruding part is fixedly connected with the inner sleeve.

As a preferable structure of the present utility model, the protection mechanism further includes a connecting member, the protruding portion is connected to the air distribution plate through the connecting member, one end of the connecting member is connected to the bottom of the protruding portion, and the other end of the connecting member is connected to the top of the air distribution plate.

As a preferable structure of the present utility model, the protection device for a circulating fluidized bed boiler further comprises a casting layer, wherein the casting layer is disposed above the air distribution plate, and the casting layer is wrapped around the periphery of the protection component.

As a preferred structure of the present utility model, the guard member includes a seal member and a retainer ring,

the sealing element is wrapped on the outer side of the air distribution plate at one end of the inner sleeve close to the hearth, the sealing element is connected with the outer wall of one end of the inner sleeve close to the hearth, and the sealing element is connected with the air distribution plate;

the retainer ring is disposed on the outer periphery of the seal member.

As a preferable structure of the present utility model, the sealing member includes a first heat insulating layer and a first heat insulating layer, the first heat insulating layer being provided on one side of the first heat insulating layer;

the outer sleeve comprises a second heat insulation layer and a second heat preservation layer, and the second heat insulation layer is arranged on one side of the second heat preservation layer.

As a preferable structure of the utility model, the protection device of the circulating fluidized bed boiler further comprises a first expansion mechanism and a second expansion mechanism;

the first expansion mechanism is arranged on the outer wall of the middle part of the slag falling pipe, and is positioned at the outer side of the air chamber;

the second expansion mechanism is arranged on the outer wall of the lower part of the slag dropping pipe, and is positioned at the lower side of the air chamber.

As a preferable structure of the utility model, the protection device of the circulating fluidized bed boiler further comprises a water cooling pipeline, wherein the water cooling pipeline is arranged at the outer side of the slag dropping pipe, and the water cooling pipeline and the slag dropping pipe are arranged at intervals;

the clearance between the water cooling pipeline and the protection mechanism is 40-60mm;

the bending degree of the water-cooling pipeline around the protection mechanism is 120-140 degrees.

As a preferable structure of the utility model, the protection device of the circulating fluidized bed boiler further comprises a plurality of blast caps and a slag cooler;

the air chambers are communicated with the hearth through the air caps;

the other end of the slag falling pipe is connected with the slag cooling machine, and a gate valve is arranged on the slag falling pipe.

Compared with the prior art, the beneficial effects of the technical scheme are as follows: the utility model relates to a protection device of a circulating fluidized bed boiler, which comprises a hearth, an air distribution plate, an air chamber, a slag dropping pipe and a protection mechanism, wherein the air distribution plate is arranged at the bottom of the hearth; the air chamber is arranged below the bottom of the hearth; the slag dropping pipe penetrates through the air chamber, one end of the slag dropping pipe is connected with the air distribution plate, and one end of the slag dropping pipe is communicated with the hearth; the protection mechanism is used for preventing slag from contacting with the welding part of the slag falling pipe and the air distribution plate so as to prevent the welding part of the slag falling pipe and the air distribution plate from deforming and cracking. According to the protection device for the circulating fluidized bed boiler, the protection mechanism is arranged, so that high-temperature slag is prevented from contacting with the welding part of the slag falling pipe and the air distribution plate, deformation and cracking of the welding part of the slag falling pipe and the air distribution plate are prevented, the protection effect is achieved, air leakage and slag leakage are avoided, slag spraying is avoided, the operation safety of workers is improved, the slag falling pipe is prevented from being blocked, and the normal operation of the circulating fluidized bed boiler is ensured.

The foregoing summary is merely an overview of the present utility model, and may be implemented according to the text and the accompanying drawings in order to make it clear to a person skilled in the art that the present utility model may be implemented, and in order to make the above-mentioned objects and other objects, features and advantages of the present utility model more easily understood, the following description will be given with reference to the specific embodiments and the accompanying drawings of the present utility model.

Drawings

The drawings are only for purposes of illustrating the principles, implementations, applications, features, and effects of the present utility model and are not to be construed as limiting the utility model.

In the drawings of the specification:

FIG. 1 is a sectional view of a prior art circulating fluidized bed boiler guard;

FIG. 2 is one of the sectional views of the guard of the circulating fluidized bed boiler according to the embodiment;

FIG. 3 is a second cross-sectional view of a guard of the circulating fluidized bed boiler according to the embodiment;

FIG. 4 is an enlarged partial schematic view of portion A of FIG. 3;

fig. 5 is a partial plan view of a guard device of the circulating fluidized bed boiler according to the embodiment.

Reference numerals referred to in the above drawings are explained as follows:

1. the hearth is provided with a hearth,

2. the air distribution plate is arranged on the upper surface of the air distribution plate,

3. a slag falling pipe is arranged on the slag falling pipe,

31. the gate valve is provided with a plurality of gate valves,

4. the protective mechanism is arranged on the inner side of the shell,

41. the outer sleeve is provided with a plurality of grooves,

42. the inner sleeve is provided with a plurality of grooves,

421. the protruding part is provided with a plurality of protruding parts,

43. the protective part is arranged on the inner side of the protective part,

431. the sealing member is provided with a seal groove,

432. the check ring is arranged on the inner side of the sleeve,

44. the connecting piece is provided with a connecting piece,

5. the first expansion mechanism is arranged on the first side of the first cylinder,

6. the second expansion mechanism is arranged on the inner side of the first expansion mechanism,

7. a water-cooling pipeline,

8. a hood of the wind-cap,

9. a slag cooling machine,

10. an air chamber.

Detailed Description

In order to describe the possible application scenarios, technical principles, practical embodiments, and the like of the present utility model in detail, the following description is made with reference to the specific embodiments and the accompanying drawings. The embodiments described herein are only for more clearly illustrating the technical aspects of the present utility model, and thus are only exemplary and not intended to limit the scope of the present utility model.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of the phrase "in various places in the specification are not necessarily all referring to the same embodiment, nor are they particularly limited to independence or relevance from other embodiments. In principle, in the present utility model, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment may be combined in any manner to form a corresponding implementable technical solution.

Unless defined otherwise, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present utility model pertains; the use of related terms herein is for the purpose of describing particular embodiments only and is not intended to limit the utility model.

In the description of the present utility model, the term "and/or" is a representation for describing a logical relationship between objects, which means that three relationships may exist, for example a and/or B, representing: there are three cases, a, B, and both a and B. In addition, the character "/" herein generally indicates that the front-to-back associated object is an "or" logical relationship.

In the present utility model, terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual number, order, or sequence of such entities or operations.

Without further limitation, the use of the terms "comprising," "including," "having," or other like terms in this specification is intended to cover a non-exclusive inclusion, such that a process, method, or article of manufacture that comprises a list of elements does not include additional elements but may include other elements not expressly listed or inherent to such process, method, or article of manufacture.

As in the understanding of "review guidelines," the expressions "greater than", "less than", "exceeding" and the like are understood to exclude this number in the present utility model; the expressions "above", "below", "within" and the like are understood to include this number. Furthermore, in the description of embodiments of the present utility model, the meaning of "a plurality of" is two or more (including two), and similarly, the expression "a plurality of" is also to be understood as such, for example, "a plurality of" and the like, unless specifically defined otherwise.

In the description of embodiments of the present utility model, spatially relative terms such as "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," etc., are used herein as a basis for the description of the embodiments or as a basis for the description of the embodiments, and are not intended to indicate or imply that the devices or components referred to must have a particular position, a particular orientation, or be configured or operated in a particular orientation and therefore should not be construed as limiting the embodiments of the present utility model. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "affixed," "disposed," and the like as used in the description of embodiments of the utility model should be construed broadly. For example, the "connection" may be a fixed connection, a detachable connection, or an integral arrangement; the device can be mechanically connected, electrically connected and communicated; it can be directly connected or indirectly connected through an intermediate medium; which may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the embodiments of the present utility model can be understood by those skilled in the art to which the present utility model pertains according to circumstances.

Referring to fig. 2 to 5, the present embodiment relates to a protection device for a circulating fluidized bed boiler, which includes a furnace 1, an air distribution plate 2, an air chamber 10, a slag dropping pipe 3 and a protection mechanism 4, wherein the air distribution plate 2 is disposed at the bottom of the furnace 1; the air chamber 10 is arranged below the bottom of the hearth 1, wherein air is supplied into the air chamber 10 through a fan, and the air chamber 10 is specifically a water-cooled air chamber 10. The slag dropping pipe 3 penetrates through the air chamber 10, one end of the slag dropping pipe 3 is fixedly connected with the air distribution plate 2 through welding, one end of the slag dropping pipe 3 is communicated with the hearth 1, a slag dropping port is formed in the air distribution plate 2, one end of the slag dropping pipe 3 is communicated with the slag dropping port, and one end of the slag dropping pipe 3 is communicated with the hearth 1. The protection mechanism 4 is used for preventing slag from contacting with the welding part of the slag falling pipe 3 and the air distribution plate 2, so as to protect the welding part of the slag falling pipe 3 and the air distribution plate 2 from deforming and cracking, and play a role in protection. Specifically, the protection device of the circulating fluidized bed boiler in the embodiment is provided with the protection mechanism 4, so that high-temperature slag is prevented from contacting with the welding part of the slag falling pipe 3 and the air distribution plate 2, deformation and cracking of the welding part of the slag falling pipe 3 and the air distribution plate 2 are prevented, a protection effect is achieved, air leakage and slag leakage are avoided, slag spraying is avoided, the operation safety of workers is improved, the blocking of the slag falling pipe 3 is avoided, and the normal operation of the circulating fluidized bed boiler is ensured.

Further, in some embodiments, as shown in fig. 2 to 5, the protection mechanism 4 includes an outer sleeve 41, an inner sleeve 42, and a protection component 43, where the outer sleeve 41 is wrapped around the outer periphery of the slag falling pipe 3, and the outer sleeve 41 is connected with the outer wall of the slag falling pipe 3 and the bottom of the air distribution plate 2 through welding; specifically, through being equipped with outer tube 41, get up the welding position parcel of the outer wall of sediment pipe and the bottom of grid plate 2, avoid the direct welding position contact with the bottom of grid plate 2 of lateral wall and grid plate 3 of slag of high temperature to protect the welding position deformation, the fracture of sediment pipe 3 and grid plate 2, play the guard action, avoid leaking out of air and leak the sediment, avoid forming the sediment that spouts, improve staff's operation security, avoid the sediment pipe 3 jam of falling, guarantee circulating fluidized bed boiler's normal operating. In this embodiment, the outer sleeve 41 is made of heat insulation material. Preferably, in this embodiment, the outer sleeve 41 includes a second heat insulation layer and a second heat insulation layer, where the second heat insulation layer is disposed on one side of the second heat insulation layer, and the second heat insulation layer may be disposed near the outer wall of the slag falling pipe 3, or the second heat insulation layer may also be disposed near the outer wall of the slag falling pipe 3.

Further, in some embodiments, as shown in fig. 2 to 5, the inner sleeve 42 is nested and disposed on the inner wall of the slag falling pipe 3, and a gap is left between the outer wall of the inner sleeve 42 and the inner wall of the slag falling pipe 3, so that the slag falling pipe 3 is not directly extruded by the inner sleeve 42 due to thermal expansion of the inner sleeve 42, thereby avoiding deformation and cracking of the slag falling pipe 3 and protecting the slag falling pipe 3. Wherein the gap spacing between the outer wall of the inner sleeve 42 and the inner wall of the slag falling pipe 3 is 4-6mm. Preferably, in this embodiment, the gap spacing between the outer wall of the inner sleeve 42 and the inner wall of the slag falling pipe 3 is 5mm. Further, the inner sleeve 42 is close to one end of the hearth 1 and extends out of the slag falling pipe 3, the inner sleeve 42 is close to one end of the hearth 1 and is connected with the air distribution plate 2, high-temperature slag is prevented from directly contacting with the welding part of the inner wall of the slag falling pipe 3 and the top of the air distribution plate 2, deformation and cracking of the welding part of the slag falling pipe 3 and the air distribution plate 2 are prevented, a protection effect is achieved, air leakage and slag leakage are avoided, slag spraying is avoided, the operation safety of workers is improved, the slag falling pipe 3 is prevented from being blocked, and normal operation of the circulating fluidized bed boiler is ensured.

Specifically, in this embodiment, as shown in fig. 2 to 5, one end of the inner sleeve 42, which is close to the furnace chamber 1, is provided with a protruding portion 421, the protruding portion 421 extends outwards along the outer wall of the inner sleeve 42, and the protruding portion 421 and the inner sleeve 42 are integrally formed, so that high-temperature slag is prevented from directly contacting with the welding position of the inner wall of the slag falling pipe 3 and the top of the air distribution plate 2, deformation and cracking of the welding position of the slag falling pipe 3 and the air distribution plate 2 are prevented, a protection effect is achieved, air leakage and slag leakage are avoided, slag spraying is avoided, the operation safety of staff is improved, the blocking of the slag falling pipe 3 is avoided, and the normal operation of the circulating fluidized bed boiler is ensured. In other embodiments, the protruding portion 421 is fixedly connected to the inner sleeve 42 by welding. Wherein the protruding part 421 is connected to the air distribution plate 2, thereby fixing the inner sleeve 42 and preventing the inner sleeve 42 from falling off. Specifically, in this embodiment, as shown in fig. 2 to 5, the protection mechanism 4 further includes a connecting piece 44, the protruding portion 421 is connected with the air distribution plate 2 through the connecting piece 44, and the connecting piece 44 is used for fixing the inner sleeve 42, so as to prevent the inner sleeve 42 from falling off. One end of the connecting piece 44 is connected to the bottom of the protruding portion 421, so that high-temperature slag is prevented from directly contacting the connecting piece 44, deformation and cracking of the connecting piece 44 are prevented, and the other end of the connecting piece 44 is connected to the top of the air distribution plate 2. Preferably, in this embodiment, the connection member 44 is made of angle iron.

Further, in some embodiments, as shown in fig. 2 to 5, the protection component 43 is disposed on the outer periphery of the end, close to the furnace 1, of the inner sleeve 42, and the protection component 43 is used for wrapping and sealing the end, close to the furnace 1, of the inner sleeve 42 with the air distribution plate 2, so as to play a role in sealing and wrapping, prevent high-temperature slag from directly contacting with the welding part between the inner wall of the slag falling pipe 3 and the top of the air distribution plate 2, prevent the welding part between the slag falling pipe 3 and the air distribution plate 2 from deforming and cracking, play a role in protecting, prevent air leakage and slag leakage, avoid forming slag spraying, improve the operation safety of staff, avoid the blocking of the slag falling pipe 3, and ensure the normal operation of the circulating fluidized bed boiler. It should be noted that the structure of the protection mechanism 4 of the present embodiment is not limited to this, and those skilled in the art can select other suitable protection mechanisms 4 according to the teachings of the present embodiment.

Further, in some embodiments, as shown in fig. 2 to 5, the protection component 43 includes a sealing member 431 and a retainer ring 432, the sealing member 431 is wrapped around the outer side of the air distribution plate 2 and the end of the inner sleeve 42 near the furnace 1, the sealing member 431 is connected with the outer wall of the end of the inner sleeve 42 near the furnace 1, and the sealing member 431 is connected with the air distribution plate 2, so as to seal and wrap the end of the inner sleeve 42 near the furnace 1 and the air distribution plate 2, and avoid direct contact with high-temperature slag. The retainer ring 432 is disposed on the outer periphery of the sealing member 431, thereby protecting the sealing member 431 from direct contact with high-temperature slag. Wherein the sealing member 431 is made of heat insulation material. Preferably, in this embodiment, the sealing member 431 includes a first heat insulating layer and a first heat preserving layer, and the first heat insulating layer is disposed on one side of the first heat insulating layer; wherein the first insulation layer may be disposed adjacent to the outer wall of the inner sleeve 42 or the first insulation layer may be disposed adjacent to the outer wall of the inner sleeve 42. It should be noted that the structure of the protection member 43 of the present embodiment is not limited to this, and those skilled in the art can select other suitable protection members 43 according to the teachings of the present embodiment.

Further, in some embodiments, as shown in fig. 2 to 5, the protection device of the circulating fluidized bed boiler further includes a casting layer, the casting layer is disposed above the air distribution plate 2, and the casting layer wraps the periphery of the protection component 43, so as to perform a heat insulation function, where the casting layer is equal to the protection component 43 in height, so as to perform a heat insulation protection function on the protection component 43. Wherein the pouring layer is made of pouring heat insulation materials.

Further, in certain embodiments, as shown in fig. 2 to 5, the protection device of the circulating fluidized bed boiler further comprises a first expansion mechanism 5 and a second expansion mechanism 6; the first expansion mechanism 5 is arranged on the outer wall of the middle part of the slag falling pipe 3, and the first expansion mechanism 5 is positioned on the outer side of the air chamber 10; the second expansion mechanism 6 is arranged on the outer wall of the lower part of the slag falling pipe 3, and the second expansion mechanism 6 is positioned at the lower side of the air chamber 10. Wherein the first expansion mechanism 5 and the second expansion mechanism 6 can be metal expanders or expansion joints. The two expansion mechanisms (the first expansion mechanism 5 and the second expansion mechanism 6) are selected to counteract the thermal expansion, so that the deformation and cracking of the slag falling pipe 3 are reduced or avoided, and the slag falling pipe 3 is protected.

Further, in some embodiments, as shown in fig. 2 to 5, the protection device of the circulating fluidized bed boiler further includes a water cooling pipeline 7, the water cooling pipeline 7 is disposed on the outer side of the slag falling pipe 3, the water cooling pipeline 7 is disposed at intervals with the slag falling pipe 3, so that the slag falling pipe 3 is prevented from being heated, expanded and extruded to break the water cooling pipeline 7, and the water cooling pipeline 7 is prevented from being leaked. Wherein the clearance between the water cooling pipeline 7 and the protection mechanism 4 is 40-60mm; preferably, in this embodiment, the gap between the water-cooling pipeline 7 and the protection mechanism 4 is 50mm, so as to avoid the slag dropping pipe 3 from being heated, expanded and extruded to break the water-cooling pipeline 7, and avoid the leakage of the water-cooling pipeline 7. Wherein the bending degree of the water-cooling pipeline 7 around the protection mechanism 4 is 120-140 degrees. Preferably, in this embodiment, the bending degree of the water-cooling pipeline 7 around the protection mechanism 4 is 130 °, so as to avoid the slag falling pipe 3 from being heated, expanded and extruded to break the water-cooling pipeline 7, and avoid the leakage of the water-cooling pipeline 7.

Further, in certain embodiments, as shown in fig. 2 to 5, the protection device of the circulating fluidized bed boiler further comprises a plurality of hoods 8 and a slag cooler 9; the wind caps 8 are respectively arranged on the wind distribution plate 2, and the wind chamber 10 is communicated with the hearth 1 through the wind caps 8; the other end of the slag falling pipe 3 is connected with the slag cooler 9, and a gate valve 31 is arranged on the slag falling pipe 3.

Specifically, in this embodiment, as shown in fig. 2 to 5, the protection device of the circulating fluidized bed boiler in this embodiment is provided with the outer sleeve 41, the inner sleeve 42 and the protection component 43, so that the welding part of the slag falling pipe 3 and the air distribution plate 2 and the inner layer and the outer layer of the slag falling pipe 3 are wrapped and protected, the high-temperature slag is prevented from directly contacting the welding part of the slag falling pipe 3 and the top of the air distribution plate 2, the welding part of the slag falling pipe 3 and the air distribution plate 2 is prevented from deforming and cracking, the protection effect is achieved, the air leakage and slag leakage are avoided, the slag spraying is avoided, the operation safety of workers is improved, the blocking of the slag falling pipe 3 is avoided, and the normal operation of the circulating fluidized bed boiler is ensured. Further, when both the outer sleeve 41 and the inner sleeve 42 are expanded by heating, the acting forces of the expansion by heating can be offset from each other because the outer sleeve 41 and the inner sleeve 42 are arranged at the first position and the second position, so that the slag dropping pipe 3 is further protected. And further, compared with the replacement of the slag falling pipe 3, the outer sleeve 41 and the inner sleeve 42 are more convenient to replace, and the cost is low.

Finally, it should be noted that, although the embodiments have been described in the text and the drawings, the scope of the utility model is not limited thereby. The technical scheme generated by replacing or modifying the equivalent structure or equivalent flow by utilizing the content recorded in the text and the drawings of the specification based on the essential idea of the utility model, and the technical scheme of the embodiment directly or indirectly implemented in other related technical fields are included in the patent protection scope of the utility model.

Claims (10)

1. A protection device for a circulating fluidized bed boiler, comprising:

a furnace;

the air distribution plate is arranged at the bottom of the hearth;

the air chamber is arranged below the bottom of the hearth;

the slag dropping pipe penetrates through the air chamber, one end of the slag dropping pipe is connected with the air distribution plate, and one end of the slag dropping pipe is communicated with the hearth;

and the protection mechanism is used for preventing slag from contacting with the welding part of the slag falling pipe and the air distribution plate so as to prevent the welding part of the slag falling pipe and the air distribution plate from deforming and cracking.

2. The protection device for a circulating fluidized bed boiler of claim 1, wherein: the protection mechanism comprises an outer sleeve, an inner sleeve and a protection part;

the outer sleeve is wrapped and arranged on the periphery of the slag falling pipe, and the outer sleeve is connected with the outer wall of the slag falling pipe and the bottom of the air distribution plate;

the inner sleeve is nested and arranged on the inner wall of the slag falling pipe, a gap is reserved between the outer wall of the inner sleeve and the inner wall of the slag falling pipe, the slag falling pipe extends out of one end of the inner sleeve, which is close to the hearth, and one end of the inner sleeve, which is close to the hearth, is connected with the air distribution plate;

the protection part is arranged on the periphery of one end, close to the hearth, of the inner sleeve, and is used for wrapping and sealing one end, close to the hearth, of the inner sleeve and the air distribution plate.

3. The protection device for a circulating fluidized bed boiler of claim 2, wherein: the inner sleeve is provided with a protruding part at one end close to the hearth, the protruding part extends outwards along the outer wall of the inner sleeve, and the protruding part is connected with the air distribution plate;

the protruding part and the inner sleeve are integrally formed; or (b)

The protruding part is fixedly connected with the inner sleeve.

4. A protection device for a circulating fluidized bed boiler according to claim 3, characterized in that: the protection mechanism further comprises a connecting piece, the protruding portion is connected with the air distribution plate through the connecting piece, one end of the connecting piece is connected to the bottom of the protruding portion, and the other end of the connecting piece is connected to the top of the air distribution plate.

5. The protection device for a circulating fluidized bed boiler of claim 2, wherein: the protection device of the circulating fluidized bed boiler further comprises a pouring layer, wherein the pouring layer is arranged above the air distribution plate, and the periphery of the protection part is wrapped by the pouring layer.

6. The protection device for a circulating fluidized bed boiler of claim 2, wherein: the protective component comprises a sealing element and a check ring;

the sealing element is wrapped on the outer side of the air distribution plate at one end of the inner sleeve close to the hearth, the sealing element is connected with the outer wall of one end of the inner sleeve close to the hearth, and the sealing element is connected with the air distribution plate;

the retainer ring is disposed on the outer periphery of the seal member.

7. The protection device for a circulating fluidized bed boiler of claim 6, wherein: the sealing piece comprises a first heat insulation layer and a first heat preservation layer, wherein the first heat insulation layer is arranged on one side of the first heat preservation layer;

the outer sleeve comprises a second heat insulation layer and a second heat preservation layer, and the second heat insulation layer is arranged on one side of the second heat preservation layer.

8. The protection device for a circulating fluidized bed boiler of claim 1, wherein: the protection device of the circulating fluidized bed boiler further comprises a first expansion mechanism and a second expansion mechanism;

the first expansion mechanism is arranged on the outer wall of the middle part of the slag falling pipe, and is positioned at the outer side of the air chamber;

the second expansion mechanism is arranged on the outer wall of the lower part of the slag dropping pipe, and is positioned at the lower side of the air chamber.

9. The protection device for a circulating fluidized bed boiler of claim 1, wherein: the protection device of the circulating fluidized bed boiler further comprises a water cooling pipeline, wherein the water cooling pipeline is arranged at the outer side of the slag dropping pipe, and the water cooling pipeline and the slag dropping pipe are arranged at intervals;

the clearance between the water cooling pipeline and the protection mechanism is 40-60mm;

the bending degree of the water-cooling pipeline around the protection mechanism is 120-140 degrees.

10. The protection device for a circulating fluidized bed boiler of claim 1, wherein:

the protection device of the circulating fluidized bed boiler further comprises a plurality of hoods and a slag cooler;

the air chambers are communicated with the hearth through the air caps;

the other end of the slag falling pipe is connected with the slag cooling machine, and a gate valve is arranged on the slag falling pipe.