Sealing structure for water-cooled wall housing of peak-shaving boiler

Abstract

The invention discloses a peak-shaving boiler water-cooled wall housing sealing structure, relates to the technical field of boiler water-cooled wall engineering, and mainly aims to realize sealing and heat insulation of a housing opening and ensure three-dimensional free expansion of a rigid leading-out rod piece. According to the main technical scheme, the sealing structure comprises a housing, and a first through hole is formed in the housing; the rigid leading-out rod piece extends out of the cover shell through the first through hole, an expansion gap is formed between the hole wall of the first through hole and the rigid leading-out rod piece, and the expansion gap is used for providing a moving space for the rigid leading-out rod piece; the first sealing piece is arranged in the housing, the first sealing piece comprises a first heat insulation layer, a second through hole is formed in the first heat insulation layer, the first heat insulation layer is laid on the inner wall of the housing and covers the expansion gap, the first through hole corresponds to the second through hole, and the rigid lead-out rod piece penetrates through the second through hole; the hole wall of the second through hole makes contact with the rigid leading-out rod piece, and the first heat insulation layer is arranged in a wrinkled mode.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler water-cooled wall engineering, and more particularly to a sealing structure for the casing of a peaking boiler water-cooled wall. Background Art

[0002] At present, with the frequent peak shaving in the power industry, the load fluctuation causes the frequent expansion and change of the high-temperature header of the boiler, which is likely to cause fatigue cracking at the fillet weld position of the header nozzle seat, and seriously, it will cause the unit to trip.

[0003] With the advancement of power digitization, the industry usually uses the method of on-line monitoring to monitor the expansion and change of the header. Since the header is in the high-temperature environment of the casing, it is usually impossible to directly measure the expansion amount of the header. It is often necessary to weld a rigid lead-out rod at the end of the header and extend it to the outside of the casing, so as to indirectly reflect the expansion amount change of the header by measuring the change of the expansion amount of the end point of the rigid lead-out rod. Therefore, it is necessary to open a hole in the casing for the rigid lead-out rod to extend out. Then the sealing between the hole in the casing and the rigid lead-out rod becomes a key problem. In the related art, the gap is usually filled with heat-insulating material for sealing. However, this sealing method not only has poor heat-insulating effect, but also easily affects the three-dimensional free expansion of the rigid lead-out rod. Summary of the Invention

[0004] In view of this, an embodiment of the present invention provides a sealing structure for the casing of a peaking boiler water-cooled wall, and the main purpose is to achieve the sealing and heat insulation of the hole in the casing and ensure the three-dimensional free expansion of the rigid lead-out rod.

[0005] To achieve the above object, the present invention mainly provides the following technical solutions:

[0006] An embodiment of the present invention provides a sealing structure for the casing of a peaking boiler water-cooled wall, including:

[0007] A casing, in which a first through hole is opened;

[0008] A rigid lead-out rod, which extends out of the casing through the first through hole, and there is an expansion gap between the hole wall of the first through hole and the rigid lead-out rod, and the expansion gap is used to provide a moving space for the rigid lead-out rod;

[0009] A first seal, which is arranged inside the casing, the first seal includes a first heat-insulating layer, a second through hole is opened on the first heat-insulating layer, the first heat-insulating layer is laid on the inner wall of the casing and covers the expansion gap, the first through hole and the second through hole correspond to each other, the rigid lead-out rod passes through the second through hole, the hole wall of the second through hole is in contact with the rigid lead-out rod, and the first heat-insulating layer is arranged in a folded manner.

[0010] Further, the rigid lead-out rod is a channel steel;

[0011] The peak-shaving boiler water-cooled wall casing sealing structure further includes a heat-insulating member, the heat-insulating member is filled inside the channel steel, and the heat-insulating member is in contact with the wall of the second through-hole.

[0012] Further, the first sealing member further includes a positioning member, the positioning member is connected to the first heat-insulating layer, and is used to keep the wall of the second through-hole in contact with the rigid lead-out rod.

[0013] Further, the positioning member includes a positioning frame and a plurality of first fasteners, the shape of the positioning frame matches the shape of the second through-hole, the positioning frame is sleeved outside the rigid lead-out rod, and the positioning frame is connected to the first heat-insulating layer by the plurality of first fasteners and is located at the edge of the second through-hole.

[0014] Further, the first sealing member further includes a first fixing member, the first fixing member is arranged on the outer periphery of the first through-hole, and the first heat-insulating layer is connected to the inner wall of the casing through the first fixing member.

[0015] Further, the first fixing member includes a fixing frame and a plurality of second fasteners, the fixing frame surrounds the outside of the first through-hole, and the fixing frame is connected to the inner wall of the casing through the plurality of second fasteners.

[0016] Further, the peak-shaving boiler water-cooled wall casing sealing structure further includes:

[0017] A second sealing member, arranged outside the casing, the second sealing member includes a second heat-insulating layer, the second heat-insulating layer is laid on the outer wall of the casing and covers the expansion gap, a third through-hole corresponding to the first through-hole is opened on the second heat-insulating layer, the rigid lead-out rod passes through the third through-hole, the wall of the third through-hole is in contact with the rigid lead-out rod, the top of the second heat-insulating layer is connected to the outer wall of the casing, and the side and bottom of the second heat-insulating layer are both in a free state;

[0018] A notch is opened on the second heat-insulating layer, and the notch penetrates through to the third through-hole.

[0019] Further, the notch is located at the bottom of the second heat-insulating layer; the notch extends in a straight line and is perpendicular to the rigid lead-out rod.

[0020] Further, the rigid lead-out rod is a channel steel;

[0021] The peak - shaving boiler water - cooled wall housing sealing structure further includes a heat - insulating member, which is filled inside the channel steel and is in contact with the wall of the third through - hole.

[0022] Further, the second sealing member further includes a second fixing member, and the top of the second heat - insulating layer is connected to the outer wall of the housing through the second fixing member;

[0023] The second fixing member includes a fixing plate and a plurality of third fasteners. The fixing plate extends horizontally above the first through - hole, and the fixing plate is connected to the outer wall of the housing through the plurality of third fasteners.

[0024] By means of the above - mentioned technical solution, the present invention has at least the following beneficial effects:

[0025] In the peak - shaving boiler water - cooled wall housing sealing structure provided by the embodiment of the present invention, the first sealing member includes a first heat - insulating layer. The first heat - insulating layer is laid on the inner wall of the housing and covers the expansion gap between the rigid lead - out rod and the wall of the first through - hole on the housing. At the same time, the rigid lead - out rod is in contact with the wall of the second through - hole on the first heat - insulating layer, so that the first heat - insulating layer plays a good role in sealing and heat - insulating the first through - hole; moreover, the first heat - insulating layer is arranged in folds. When the rigid lead - out rod generates displacement in the expansion gap as the header expands, the folds of the first heat - insulating layer can be stretched as the rigid lead - out rod moves, thus ensuring the three - dimensional free expansion of the rigid lead - out rod. That is to say, the sealing structure provided by the embodiment of the present invention not only plays a good heat - insulating role but also ensures the three - dimensional free expansion of the rigid lead - out rod, which is of great significance for the safety of equipment operation and the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. is a schematic structural diagram of a first sealing member in a peak - shaving boiler water - cooled wall housing sealing structure provided by an embodiment of the present invention;

[0027] Figure 2 FIG. is a schematic structural diagram of a second sealing member in a peak - shaving boiler water - cooled wall housing sealing structure provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention. Below, with reference to the accompanying drawings, some embodiments of the present invention will be described in detail. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0029] In the description of this embodiment, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of this embodiment.

[0030] As Figure 1 shown, the embodiment of the present invention provides a peak-shaving boiler water-cooled wall casing sealing structure, which includes a casing, and a first through hole 1 is opened on the casing; a rigid lead-out rod 2, and the rigid lead-out rod 2 extends out of the casing through the first through hole 1. There is an expansion gap between the hole wall of the first through hole 1 and the rigid lead-out rod 2, and this expansion gap is used to provide a moving space for the rigid lead-out rod 2; a first seal 3, which is arranged inside the casing. The first seal 3 includes a first heat insulation layer 31, and a second through hole is opened on the first heat insulation layer 31. The first heat insulation layer 31 is laid on the inner wall of the casing and covers the expansion gap. The first through hole 1 and the second through hole correspond to each other, and the rigid lead-out rod 2 passes through the second through hole. The hole wall of the second through hole is in contact with the rigid lead-out rod 2, and the first heat insulation layer 31 is arranged in a folded manner. Among them, the first heat insulation layer 31 can be made of a heat insulation material with high temperature resistance and flexibility, such as aluminum silicate fiber, fiberglass fireproof cloth, ceramic fiber composite blanket, etc.

[0031] It can be understood that the size of the first through hole 1 can be determined according to the three-dimensional thermal expansion amount of the rigid lead-out rod 2; correspondingly, the first heat insulation layer 31 is arranged in a folded manner, that is, the parts of the first heat insulation layer 31 in the up, down, left, and right directions of the rigid lead-out rod 2 are all arranged in a folded manner, not in a taut manner, and the size of the folds can be determined according to the three-dimensional thermal expansion amount of the rigid lead-out rod 2, so as to ensure the three-dimensional free expansion of the rigid lead-out rod 2.

[0032] In the peak-shaving boiler water-cooled wall casing sealing structure provided by the embodiment of the present invention, the first seal 3 includes a first heat insulation layer 31. The first heat insulation layer 31 is laid on the inner wall of the casing and covers the expansion gap between the rigid lead-out rod 2 and the hole wall of the first through hole 1 on the casing. At the same time, the rigid lead-out rod 2 is in contact with the hole wall of the second through hole on the first heat insulation layer 31, so that the first heat insulation layer 31 plays a good role in sealing and heat insulation for the first through hole 1; moreover, the first heat insulation layer 31 is arranged in a folded manner. When the rigid lead-out rod 2 generates displacement in the expansion gap as the header expands, the folds of the first heat insulation layer 31 can be stretched as the rigid lead-out rod 2 moves, thus ensuring the three-dimensional free expansion of the rigid lead-out rod 2. That is to say, the sealing structure provided by the embodiment of the present invention not only plays a good heat insulation role but also ensures the three-dimensional free expansion of the rigid lead-out rod 2, which is of great significance for the safety of equipment operation and the environment.

[0033] In some embodiments, referring to Figure 1 , the rigid lead-out rod 2 can be a channel steel; the peak-shaving boiler water-cooled wall casing sealing structure further includes a heat preservation member 4. The heat preservation member 4 is filled inside the channel steel, and the heat preservation member 4 is in contact with the hole wall of the second through hole.

[0034] Among them, the inner groove of the channel steel is filled and blocked by the heat preservation member 4, and the part of the heat preservation member 4 located at the open end of the channel steel is in contact with the hole wall of the second through hole, so as to ensure that there is no gap between the sealing structure and the channel steel, and further ensure the heat insulation effect of the sealing structure on the high temperature inside the casing. Specifically, the heat preservation member 4 can be heat preservation cotton.

[0035] In some embodiments, referring to Figure 1 , the first seal 3 can further include a positioning member 32. The positioning member 32 is connected to the first heat insulation layer 31 and is used to keep the hole wall of the second through hole in contact with the rigid lead-out rod 2.

[0036] By setting the positioning member 32, when the rigid lead-out rod 2 expands three-dimensionally, the positioning member 32 can make the hole wall of the second through hole always remain in contact with the rigid lead-out rod 2, thus ensuring the sealing reliability of the sealing structure.

[0037] Among them, the structural form of the positioning member 32 can be various, as long as it can keep the hole wall of the second through hole in contact with the rigid lead-out rod 2 all the time.

[0038] For the convenience of use, in some embodiments, referring to Figure 1 , the positioning member 32 may include a positioning frame 321 and a plurality of first fasteners 322. The shape of the positioning frame 321 matches the shape of the second through hole. The positioning frame 321 is sleeved outside the rigid lead-out rod 2, and the positioning frame 321 is connected to the first heat insulation layer 31 through a plurality of first fasteners 322 and is located at the edge of the second through hole.

[0039] Among them, the positioning frame 321 is sleeved outside the rigid lead-out rod 2 and is located at the edge of the second through hole. Thus, the edge of the second through hole of the first heat insulation layer 31 is positioned on the outer wall of the rigid lead-out rod 2 by the positioning frame 321 and can move along with the rigid lead-out rod 2, so as to achieve the purpose that the hole wall of the second through hole always keeps in contact with the rigid lead-out rod 2, ensure no gap between the rigid lead-out rod 2 and the first heat insulation layer 31, and further improve the sealing and heat insulation effect of the first heat insulation layer 31. The structure is simple and the use is reliable. Specifically, the positioning frame 321 can be made of steel plate, and the first fastener 322 can be a dovetail nail.

[0040] In some embodiments, referring to Figure 1 , the first seal 3 may further include a first fixing member 33. The first fixing member 33 is arranged on the outer periphery of the first through hole 1, and the first heat insulation layer 31 is connected to the inner wall of the housing through the first fixing member 33 so that the first heat insulation layer 31 is stably laid on the inner wall of the housing.

[0041] Among them, the structural form of the first fixing member 33 can be various, as long as it can stably fix the first heat insulation layer 31 to the inner wall of the housing.

[0042] In some embodiments, referring to Figure 1 , the first fixing member 33 may include a fixing frame 331 and a plurality of second fasteners 332. The fixing frame 331 surrounds the outside of the first through hole 1, and the fixing frame 331 is connected to the inner wall of the housing through a plurality of second fasteners 332, so that the first heat insulation layer 31 stably seals the first through hole 1 along the circumferential direction of the first through hole 1 inside the housing.

[0043] It should be noted that a relatively large surplus can be left in the circumferential direction of the first heat insulation layer 31 at the first through hole 1, so as to ensure that the fixing frame 331 has enough installation space to fix the first heat insulation layer 31. Specifically, the fixing frame 331 can be a wide steel sheet, and the second fastener 332 can be a dovetail nail.

[0044] In some embodiments, referring to Figure 2, the peak shaving boiler water wall casing sealing structure may further include a second seal 5 disposed outside the casing. The second seal 5 includes a second heat insulation layer 51 laid on the outer wall of the casing and covering the expansion gap. A third through hole corresponding to the first through hole 1 is provided on the second heat insulation layer 51. The rigid lead-out rod 2 passes through the third through hole, and the hole wall of the third through hole is in contact with the rigid lead-out rod 2. The top of the second heat insulation layer 51 is connected to the outer wall of the casing, and the side and bottom of the second heat insulation layer 51 are in a free state; a notch 511 is provided on the second heat insulation layer 51, and the notch 511 penetrates through to the third through hole.

[0045] The second seal 5 located outside the casing and the first seal 3 located inside the casing cooperate with each other. That is, the first heat insulation layer 31 and the second heat insulation layer 51 jointly seal the first through hole 1 inside and outside the casing, further improving the sealing effect of the sealing structure on the first through hole 1.

[0046] Among them, the second heat insulation layer 51 of the second seal 5 is arranged in a curtain-like structure. That is, the top of the second heat insulation layer 51 is connected to the outer wall of the casing, and the side and bottom are in a free state. This structural arrangement realizes the sealing of the first through hole 1 by the second heat insulation layer 51 outside the casing. Compared with the heat insulation layer arranged in folds inside the casing, it also ensures the structural compactness and aesthetics of the equipment. At the same time, the second heat insulation layer 51 arranged in a curtain-like manner outside the casing has a flat surface and is not easily damaged by external forces such as pulling and collision; moreover, a notch 511 penetrating through to the third through hole is provided on the second heat insulation layer 51, which is more conducive to realizing the three-dimensional free expansion of the rigid lead-out rod 2. Specifically, the second heat insulation layer 51 can be made of a heat-resistant and flexible heat insulation material, such as aluminum silicate fiber, fiberglass fireproof cloth, ceramic fiber composite blanket, etc.

[0047] It can be understood that the structural form of the second seal 5 can be the same as that of the first seal 3. That is to say, a heat insulation layer arranged in folds can also be installed outside the casing to cover the expansion gap, which can better improve the sealing effect of the sealing structure on the casing.

[0048] In some embodiments, referring to Figure 2 , the notch 511 can be located at the bottom of the second heat insulation layer 51. The notch 511 extends in a straight line and is perpendicular to the rigid lead-out rod 2, which is more convenient for the rigid lead-out rod 2 to displace in the up, down, left, and right directions, and thus more convenient for the three-dimensional free expansion of the rigid lead-out rod 2.

[0049] In some embodiments, referring to Figure 2, the rigid lead-out rod 2 can be a channel steel; the peaking boiler water-cooled wall housing sealing structure further includes a heat-insulating member 4 such as heat-insulating cotton, and the heat-insulating member 4 is filled inside the channel steel. The heat-insulating member 4 is in contact with the hole wall of the third through hole, so as to ensure that there is no gap between the sealing structure and the channel steel, and further ensure the heat-insulating effect of the sealing structure on the high temperature inside the housing.

[0050] In some embodiments, referring to Figure 2 , the second sealing member 5 further includes a second fixing member 52. The top of the second heat-insulating layer 51 is connected to the outer wall of the housing through the second fixing member 52, so that the second heat-insulating layer 51 is arranged in a curtain-like structure.

[0051] Among them, the structural form of the second fixing member 52 can be various, as long as it can stably fix the second heat-insulating layer 51 to the outer wall of the housing.

[0052] In some embodiments, referring to Figure 2 , the second fixing member 52 can include a fixing plate 521 and a plurality of third fasteners 522. The fixing plate 521 horizontally extends above the first through hole 1, and the fixing plate 521 is connected to the outer wall of the housing through the plurality of third fasteners 522, so that the second heat-insulating layer 51 stably seals the first through hole 1 outside the housing.

[0053] It should be noted that a relatively large surplus can be left in the circumferential direction of the second heat-insulating layer 51 at the first through hole 1, so as to ensure that the fixing plate 521 has enough installation space to fix the second heat-insulating layer 51, and at the same time, ensure that the second heat-insulating layer 51 covers the expansion space. Specifically, the fixing plate 521 can be a wide steel sheet, and the third fastener 522 can be a dovetail nail.

[0054] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealing structure for the water wall casing of a peak shaving boiler, characterized in that, Comprising: A housing, in which a first through-hole is formed; A rigid lead-out rod, which extends out of the housing through the first through-hole, and there is an expansion gap between the hole wall of the first through-hole and the rigid lead-out rod, and the expansion gap is used to provide a moving space for the rigid lead-out rod; A first seal, arranged inside the housing, the first seal includes a first heat-insulating layer, a second through-hole is formed in the first heat-insulating layer, the first heat-insulating layer is laid on the inner wall of the housing and covers the expansion gap, the first through-hole and the second through-hole correspond to each other, the rigid lead-out rod passes through the second through-hole, the hole wall of the second through-hole is in contact with the rigid lead-out rod, and the first heat-insulating layer is arranged in a folded manner.

2. The peak-shaving boiler water-cooled wall housing sealing structure according to claim 1, characterized in that The rigid lead-out rod is a channel steel; The peak-shaving boiler water-cooled wall housing sealing structure further includes a heat-insulating member, the heat-insulating member is filled inside the channel steel, and the heat-insulating member is in contact with the hole wall of the second through-hole.

3. The peak-shaving boiler water-cooled wall housing sealing structure according to claim 1, characterized in that The first seal further includes a positioning member, the positioning member is connected to the first heat-insulating layer and is used to keep the hole wall of the second through-hole in contact with the rigid lead-out rod.

4. The peak-shaving boiler water-cooled wall housing sealing structure according to claim 3, characterized in that The positioning member includes a positioning frame and a plurality of first fasteners, the shape of the positioning frame matches the shape of the second through-hole, the positioning frame is sleeved outside the rigid lead-out rod, and the positioning frame is connected to the first heat-insulating layer by a plurality of the first fasteners and is located at the edge of the second through-hole.

5. The peak-shaving boiler water-cooled wall housing sealing structure according to claim 1, characterized in that The first seal further includes a first fixing member, the first fixing member is arranged on the outer periphery of the first through-hole, and the first heat-insulating layer is connected to the inner wall of the housing through the first fixing member.

6. The peak-shaving boiler water-cooled wall housing sealing structure according to claim 5, characterized in that The first fixing member includes a fixing frame and a plurality of second fasteners, the fixing frame surrounds the outside of the first through-hole, and the fixing frame is connected to the inner wall of the housing by a plurality of the second fasteners.

7. The peak shaving boiler water wall casing sealing structure according to any one of claims 1 to 6, characterized in that, Further comprising: A second seal, arranged outside the housing, the second seal includes a second heat-insulating layer, the second heat-insulating layer is laid on the outer wall of the housing and covers the expansion gap, a third through-hole corresponding to the first through-hole is formed in the second heat-insulating layer, the rigid lead-out rod passes through the third through-hole, the hole wall of the third through-hole is in contact with the rigid lead-out rod, the top of the second heat-insulating layer is connected to the outer wall of the housing, and the side and bottom of the second heat-insulating layer are in a free state; A notch is formed in the second heat-insulating layer, and the notch penetrates through to the third through-hole.

8. The peak-shaving boiler water-cooled wall housing sealing structure according to claim 7, characterized in that The notch is located at the bottom of the second heat insulation layer; the notch extends along a straight line and is perpendicular to the rigid lead-out rod member.

9. The peak-shaving boiler water wall casing sealing structure according to claim 7, characterized in that the rigid lead-out rod member is a channel steel; the peak-shaving boiler water wall casing sealing structure further includes a heat preservation member, the heat preservation member is filled inside the channel steel, and the heat preservation member is in contact with the wall of the third through hole.

10. The peak-shaving boiler water wall casing sealing structure according to claim 7, characterized in that the second sealing member further includes a second fixing member, and the top of the second heat insulation layer is connected to the outer wall of the casing through the second fixing member; the second fixing member includes a fixing plate and a plurality of third fasteners, the fixing plate horizontally extends above the first through hole, and the fixing plate is connected to the outer wall of the casing through the plurality of third fasteners.

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