Thermal insulation structure in through-wall pipe furnace

Abstract

The utility model discloses a heat preservation structure in a through-wall pipe furnace, which comprises a furnace wall and a through-wall pipeline penetrating through the furnace wall, a heat insulation pillow group is wrapped on the through-wall pipeline, the heat insulation pillow group comprises a plurality of heat insulation pillows, and part of the heat insulation pillows are arranged between an inner protective plate and an outer protective plate of the furnace wall and cover a gap between the through-wall pipeline and the outer protective plate. Heat and dense smoke are effectively prevented from flowing out of the gap between the through-wall pipeline and the inner protection plate, heat conducted to the external environment through the through-wall pipeline and the furnace wall structure is reduced, a metal bellow expansion joint is not needed any more, and the technical problem that the metal bellow expansion joint of the heat preservation structure in the through-wall pipe furnace is prone to being damaged is solved.

Description

Technical Field

[0001] The utility model relates to the field of boilers, in particular to an in-furnace thermal insulation structure for wall-piercing pipes. Background Art

[0002] In the modern industrial field, especially in thermal equipment and pipeline systems, boilers are often equipped with wall-piercing pipe heat insulation structures. Among them, the metal bellows expansion joint, as an important flexible connection component, is widely used to absorb the thermal expansion, displacement and vibration generated by pipelines due to temperature changes or mechanical vibrations, ensuring the safe operation of the unit. However, in practical applications, especially in thermal equipment such as boilers with high temperature, high pressure and frequent displacements, the design, installation and maintenance of metal bellows expansion joints face many challenges.

[0003] For example: Since the wall thickness of the metal bellows expansion joint is only 2-3 mm, which is relatively fragile, working in a high temperature and high pressure environment for a long time, coupled with frequent telescopic movements, it is extremely easy to cause fatigue damage and fracture. Such damage not only affects the normal operation of the unit, but may also lead to safety accidents. At the peak position of the metal bellows, due to its structural characteristics, it is often difficult for the thermal insulation material to be completely filled, forming a thermal insulation cavity. This not only reduces the thermal insulation effect, resulting in increased heat loss, but may also exacerbate the thermal stress of the bellows, accelerating its aging and damage. Moreover, the maintenance cost of metal bellows is high and the difficulty is great: once the metal bellows is damaged or fractured, due to its complex structure and being located inside the pipeline, the repair difficulty is extremely high. In most cases, only the overall replacement method can be adopted. This not only increases the maintenance cost, but also prolongs the shutdown and maintenance time, having an adverse impact on production.

[0004] Due to the poor thermal insulation effect and frequent damage of the bellows, heat is easily conducted to the outer protection plate through the damaged part or the thermal insulation cavity, resulting in overheating of the outer protection plate. This not only reduces the service life of the equipment, but may also pose a safety hazard to the surrounding environment. Summary of the Utility Model

[0005] In order to solve the technical problem that the metal bellows expansion joint of the in-furnace thermal insulation structure of the wall-piercing pipe in the above-mentioned prior art is easily damaged, the utility model provides an in-furnace thermal insulation structure for wall-piercing pipes.

[0006] The technical solution adopted by the utility model is:

[0007] The utility model provides an in-furnace heat preservation structure for a wall-piercing pipe, which comprises a furnace wall and a wall-piercing pipe. The wall-piercing pipe penetrates through the furnace wall and is communicated with the inside of the boiler, and there is a gap between the wall-piercing pipe and the furnace wall. The furnace wall comprises an inner protection plate and an outer protection plate, and heat preservation cotton is arranged between the inner protection plate and the outer protection plate. The structure further comprises: a heat insulation pillow group wrapping the wall-piercing pipe. The heat insulation pillow group comprises a plurality of heat insulation pillows. Part of the heat insulation pillows are located between the inner protection plate and the outer protection plate and cover the gap between the wall-piercing pipe and the outer protection plate. The heat insulation pillow is composed of a wire mesh wrapping a heat preservation material.

[0008] Further, the heat insulation pillow group comprises: a first heat insulation pillow and a second heat insulation pillow. The outer diameter of the first heat insulation pillow is larger than that of the second heat insulation pillow. The first heat insulation pillow abuts against the outer protection plate, and the second heat insulation pillow is stacked on the first heat insulation pillow to form a step with the first heat insulation pillow.

[0009] Further, the heat insulation pillow group further comprises: a third heat insulation pillow arranged on the outer side of the inner protection plate and wrapping the wall-piercing pipe. The third heat insulation pillow covers the gap between the wall-piercing pipe and the inner protection plate, and a flexible connection component is sleeved outside the third heat insulation pillow.

[0010] Further, the flexible connection component comprises:

[0011] a sleeve which is arranged around the wall-piercing pipe, and one end of the sleeve is connected with the inner protection plate and covers the gap between the inner protection plate and the wall-piercing pipe;

[0012] a second limiting plate which is arranged around the wall-piercing pipe, and the second limiting plate covers and is connected with the other end of the sleeve;

[0013] a first limiting plate which is arranged around the wall-piercing pipe and is connected with the wall-piercing pipe. The first limiting plate is located inside the second limiting plate and partially overlaps with the second limiting plate;

[0014] The third heat insulation pillow is arranged inside the sleeve, and the first limiting plate and the second limiting plate are located above the third heat insulation pillow.

[0015] Further, the inner protection plate is connected with the outer protection plate through a fixed bolt assembly.

[0016] Further, the heat insulation pillow comprises: a first splicing part and a second splicing part. The first splicing part and the second splicing part are semi-circular, and the first splicing part and the second splicing part are spliced into a ring to form the heat insulation pillow.

[0017] Further, both the first limiting plate and the second limiting plate are formed by splicing two semi-circular plates.

[0018] Compared with the prior art, the utility model provides an in-furnace heat preservation structure for a wall-piercing pipe, which includes a furnace wall and a wall-piercing pipe passing through the furnace wall. An insulating pillow group is wrapped around the wall-piercing pipe. The insulating pillow group includes a plurality of insulating pillows. Some of the insulating pillows are arranged between the inner lining plate and the outer lining plate of the furnace wall and cover the gap between the wall-piercing pipe and the outer lining plate, effectively preventing heat and thick smoke from flowing out through the gap between the wall-piercing pipe and the inner lining plate, reducing the heat conducted from the wall-piercing pipe and the furnace wall structure to the external environment, and no longer requiring a metal bellows expansion joint, thus solving the technical problem that the metal bellows expansion joint of the in-furnace heat preservation structure of the wall-piercing pipe is easily damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model;

[0021] Figure 2 It is a schematic diagram of the insulating pillow in an embodiment of the present utility model;

[0022] Figure 3 It is a cross-sectional view of the insulating pillow in an embodiment of the present utility model;

[0023] 01, Wall-piercing pipe;

[0024] 1, Outer lining plate; 2, Inner lining plate;

[0025] 3, Thermal insulation cotton; 31, First insulating pillow; 32, Second insulating pillow; 33, Third insulating pillow;

[0026] 4, Sleeve; 41, First limiting plate; 42, Second limiting plate;

[0027] 5, Fixed bolt assembly. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model more clearly understood, the following further details the present utility model with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0029] The principle and structure of the present utility model are described in detail below with reference to the drawings and embodiments.

[0030] In the modern industrial field, especially in thermal equipment and pipeline systems, boilers are often equipped with heat insulation structures for wall-penetrating pipes. Among them, metal bellows expansion joints, as an important flexible connection component, are widely used to absorb thermal expansion, displacement, and vibration generated by temperature changes or mechanical vibrations in pipelines, ensuring the safe operation of the unit. However, in practical applications, especially in thermal equipment such as boilers under high temperature, high pressure, and frequent displacement, the design, installation, and maintenance of metal bellows expansion joints face many challenges.

[0031] For example: Since the wall thickness of the metal bellows expansion joint is only 2 - 3 mm, which is relatively fragile, working in a high-temperature and high-pressure environment for a long time, coupled with frequent telescopic movements, it is extremely easy to cause fatigue damage and fracture. This kind of damage not only affects the normal operation of the unit but also may lead to safety accidents. At the peak position of the metal bellows, due to its structural characteristics, it is often difficult for the thermal insulation material to be completely filled, forming a thermal insulation cavity. This not only reduces the thermal insulation effect, resulting in increased heat loss, but also may exacerbate the thermal stress of the bellows, accelerating its aging and damage. Moreover, the maintenance cost of metal bellows is high and the difficulty is great: Once the metal bellows is damaged or fractured, due to its complex structure and being located inside the pipeline, the repair difficulty is extremely high. In most cases, only the overall replacement method can be adopted. This not only increases the maintenance cost but also prolongs the shutdown and maintenance time, having an adverse impact on production.

[0032] Due to poor thermal insulation effect and frequent damage of the bellows, heat is easily conducted to the outer protection plate through the damaged part or the thermal insulation cavity, resulting in overheating of the outer protection plate. This not only reduces the service life of the equipment but also may pose a safety hazard to the surrounding environment.

[0033] As Figures 1-3 shown, the present utility model proposes a heat insulation structure for wall-penetrating pipes inside the furnace, including a furnace wall and a wall-penetrating pipe 01. The wall-penetrating pipe 01 passes through the furnace wall and is connected to the inside of the boiler, and there is a gap between it and the furnace wall to prevent heat from being conducted to the furnace wall through the wall-penetrating pipe 01. The furnace wall includes an inner protection plate 2 and an outer protection plate 1, and thermal insulation cotton 3 is provided between the inner protection plate 2 and the outer protection plate 1. The heat insulation structure for wall-penetrating pipes inside the furnace proposed by the present utility model further includes: a heat insulation pillow group. The heat insulation pillow group is wrapped around the wall-penetrating pipe 01. The heat insulation pillow group includes a plurality of heat insulation pillows. Some heat insulation pillows are located between the inner protection plate 2 and the outer protection plate 1 and cover the gap between the wall-penetrating pipe 01 and the outer protection plate 1. The heat insulation pillows are made of wire mesh wrapped with thermal insulation material. The thermal insulation material is collectively referred to as thermal insulation cotton.

[0034] The partial heat insulation pillow is located between the inner protection plate 2 and the outer protection plate 1, covering the gap between the wall-piercing pipe 01 and the outer protection plate 1, effectively preventing heat and thick smoke from flowing out through the gap between the wall-piercing pipe 01 and the inner protection plate 2. Moreover, the heat insulation pillow group wraps the wall-piercing pipe 01 and combines with the thermal insulation cotton 3, effectively preventing heat loss, reducing the heat transferred from the wall-piercing pipe 01 and the furnace wall structure to the external environment, and improving the heat preservation efficiency of the entire boiler system. The heat insulation pillow is wrapped with a wire mesh around the heat insulation material, which can improve the strength and durability of the heat insulation pillow itself, and solve the problem that the existing metal bellows expansion joints are easily damaged. And the heat insulation pillow group reduces the temperature of the outer protection plate 1 of the furnace wall, reduces the risk of scalding when personnel accidentally touch it, and improves the safety of the workplace.

[0035] In a further embodiment, the heat insulation pillow group includes: a first heat insulation pillow 31 and a second heat insulation pillow 32. The outer diameter of the first heat insulation pillow 31 is larger than that of the second heat insulation pillow 32. The first heat insulation pillow 31 abuts against the inner wall of the outer protection plate 1, covering the gap between the outer protection plate 1 and the wall-piercing pipe 01. The second heat insulation pillow 32 is stacked on the first heat insulation pillow 31, forming a step with the first heat insulation pillow 31. This enables better heat preservation inside the boiler and prevents heat transfer to the furnace wall, and also prevents the smoke inside the boiler from flowing out between the furnace wall and the wall-piercing pipe 01.

[0036] In a further embodiment, the heat insulation pillow group further includes a third heat insulation pillow 33. The third heat insulation pillow 33 is arranged on the outer side of the inner protection plate 2, wrapping the wall-piercing pipe 01. The third heat insulation pillow 33 covers the gap between the wall-piercing pipe 01 and the inner protection plate 2, and a flexible connection component is covered on the outside of the third heat insulation pillow 33.

[0037] The third heat insulation pillow 33 seals the gap between the wall-piercing pipe 01 and the inner protection plate 2, further preventing the smoke in the furnace from escaping from the furnace wall.

[0038] The flexible connection component includes: a sleeve 4, a first limiting plate 41 and a second limiting plate 42.

[0039] The sleeve 4 is integrally cylindrical and not sealed at both ends. The sleeve 4 is arranged around the wall-piercing pipe 01, and one end edge is connected to the inner protection plate 2 and covers the gap between the inner protection plate 2 and the wall-piercing pipe 01. The second limiting plate 42 covers the other end of the sleeve. The second limiting plate 42 is annular, surrounding the wall-piercing pipe 01, and its outer edge is connected to the edge of the sleeve 4; the first limiting plate 41 is annular, arranged around the wall-piercing pipe 01 and connected to the wall-piercing pipe 01. The first limiting plate 41 is located inside the second limiting plate 42 and partially overlaps with the second limiting plate 42; the third heat insulation pillow 33 is arranged inside the sleeve 4, and the first limiting plate 41 and the second limiting plate 42 are located above the third heat insulation pillow 33.

[0040] During the installation process, the sleeve can be divided into two parts for splicing so that it can be installed around the wall-piercing pipe.

[0041] Both the first limiting plate 41 and the second limiting plate 42 are annular. Since the wall-piercing pipe 01 is immovable, the first limiting plate 41 and the second limiting plate 42 are composed of two semi-annular plates spliced together so that they can surround the wall-piercing pipe 01. The two semi-annular plates can be connected by means such as screws, buckles or welding.

[0042] In a further embodiment, the inner protective plate 2 is connected to the outer protective plate 1 through the fixing bolt assembly 5. The fixing bolt assembly 5 includes bolts and a plurality of nuts. Specifically, the inner protective plate 2 is provided with mounting holes. One end of the bolt is connected to the inner wall of the outer protective plate 1, and the other end is provided with a first nut and a second nut. After installation, the inner protective plate 2 is located between the first nut and the second nut.

[0043] In a further embodiment, the heat insulation pillow is annular and includes a first splicing part and a second splicing part. The first splicing part and the second splicing part are semi-annular. After the first splicing part and the second splicing part are spliced, they form a circular ring to constitute the heat insulation pillow.

[0044] Since the wall-piercing pipe 01 is fixed and immovable, the heat insulation pillow needs to be spliced in two parts to wrap around the outside of the wall-piercing pipe 01.

[0045] In another embodiment, the heat insulation material of the heat insulation pillow is first wrapped around the wall-piercing pipe 01, and then the wire mesh is wrapped around the outside of the heat insulation material.

[0046] The specific installation method in this embodiment:

[0047] First, connect one end of the bolt to the inner wall of the outer protection plate 1, and a first nut is provided at the other end of the bolt. Then, sequentially install the first heat insulation pillow 31 and the second heat insulation pillow 32 on the wall-piercing pipe 01, and make the first heat insulation pillow 31 cover the gap between the outer protection plate 1 and the wall-piercing pipe 01. Install the inner protection plate 2. The end of the bolt with the first nut passes through the installation hole of the inner protection plate 2, and then tighten the second nut to limit the inner protection plate 2. Fill the space between the inner protection plate 2 and the outer protection plate 1 with heat insulation cotton 3. Put the sleeve on the wall-piercing pipe 01, and cover the gap between the inner protection plate 2 and the wall-piercing pipe 01, and the bottom end is welded to the inner protection plate 2. Install the third heat insulation pillow 33 in the sleeve, and the height of the third heat insulation pillow 33 is the same as the height of the sleeve. Surround the annular second limiting plate 42 around the wall-piercing pipe 01, and the outer edge of the second limiting plate 42 is welded to the top edge of the sleeve, and there is a gap between the inner edge of the second limiting plate 42 and the wall-piercing pipe 01. Finally, surround the first limiting plate 41 around the wall-piercing pipe 01 and connect it to the wall-piercing pipe 01. The first limiting plate 41 abuts against the inner wall of the second limiting plate 42 and is located above the third heat insulation pillow 33. When the wall-piercing pipe 01 moves due to thermal expansion and contraction, the first limiting plate 41 will be blocked by the second limiting plate 42, thereby restricting the movement of the pipe.

[0048] Compared with the prior art, the present utility model proposes a wall-piercing pipe furnace internal heat insulation structure, which includes a furnace wall and a wall-piercing pipe 01 passing through the furnace wall. An insulation pillow group is wrapped on the wall-piercing pipe 01. The insulation pillow group includes a plurality of insulation pillows. Some of the insulation pillows are arranged between the inner protection plate 2 and the outer protection plate 1 of the furnace wall and cover the gap between the wall-piercing pipe 01 and the outer protection plate 1, effectively preventing heat and thick smoke from flowing out through the gap between the wall-piercing pipe 01 and the inner protection plate 2, reducing the heat conducted from the wall-piercing pipe 01 and the furnace wall structure to the external environment, and no longer requiring a metal bellows expansion joint, solving the technical problem that the metal bellows expansion joint of the wall-piercing pipe furnace internal heat insulation structure is easily damaged.

[0049] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience in description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0051] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present utility model; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0052] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned" etc. can be used here to describe the spatial positional relationships of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0053] In addition, it should be noted that the use of words such as "first", "second" etc. to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, the above words have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0054] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A through-the-wall pipe furnace insulation structure, comprising a furnace wall and a through-the-wall pipe (01), wherein the through-the-wall pipe (01) passes through the furnace wall and communicates with the interior of the boiler, and is spaced apart from the furnace wall, wherein the furnace wall comprises an inner guard plate (2) and an outer guard plate (1), and a heat-insulating cotton (3) is arranged between the inner guard plate (2) and the outer guard plate (1), and wherein: Also includes: A heat-insulating pillow group wraps the through-wall pipe (01), the heat-insulating pillow group includes a plurality of heat-insulating pillows, some of the heat-insulating pillows are located between the inner protective plate (2) and the outer protective plate (1), and cover the gap between the through-wall pipe (01) and the outer protective plate (1), and the heat-insulating pillows are composed of a steel mesh wrapped with a heat-insulating material.

2. The wall-penetrating tube furnace insulation structure according to claim 1, characterized in that: The thermal insulation pillow group comprises: a first thermal insulation pillow (31) and a second thermal insulation pillow (32); the outer diameter of the first thermal insulation pillow (31) is larger than the outer diameter of the second thermal insulation pillow (32); the first thermal insulation pillow (31) is in contact with the inner wall of the outer protective plate (1); the second thermal insulation pillow (32) is stacked on the first thermal insulation pillow (31) to form a step with the first thermal insulation pillow (31).

3. The wall-penetrating tube furnace insulation structure as claimed in claim 2, characterized in that: The thermal insulation pillow group also includes: a third thermal insulation pillow (33) arranged on the outside of the inner protective plate (2) to wrap the wall-penetrating pipe (01), the third thermal insulation pillow (33) covers the gap between the wall-penetrating pipe (01) and the inner protective plate (2), and the outer side of the third thermal insulation pillow (33) is covered with a flexible connection component.

4. The wall-penetrating tube furnace insulation structure as claimed in claim 3, characterized in that: The flexible connection assembly comprises: A sleeve (4), the sleeve (4) being arranged around the wall-penetrating pipe (01), one end of the sleeve (4) being connected to the inner protective plate (2) and covering the gap between the inner protective plate (2) and the wall-penetrating pipe (01); A second limiting plate (42), the second limiting plate (42) being arranged around the wall-penetrating pipe (01), the second limiting plate (42) covering the other end of the sleeve (4) and being connected thereto; a first limiting plate (41), the first limiting plate (41) being arranged around the wall-penetrating pipe (01) and connected to the wall-penetrating pipe (01), the first limiting plate (41) being located on the inner side of the second limiting plate (42) and partially overlapping with the second limiting plate (42); The third thermal insulation pillow (33) is arranged in the sleeve (4), and the first limiting plate (41) and the second limiting plate (42) are located above the third thermal insulation pillow (33).

5. The wall-penetrating tube furnace insulation structure according to claim 1, characterized in that: The inner guard plate (2) is connected to the outer guard plate (1) via a fixing bolt assembly (5).

6. The wall-penetrating tube furnace insulation structure according to claim 1, characterized in that: The thermal insulation pillow comprises: a first splicing portion and a second splicing portion, wherein the first splicing portion and the second splicing portion are semi-annular in shape, and the first splicing portion and the second splicing portion are spliced ​​together to form a ring shape, thereby constituting the thermal insulation pillow.

7. The wall-penetrating tube furnace insulation structure according to claim 4, characterized in that: The first limiting plate (41) and the second limiting plate (42) are annular in shape and are both formed by splicing two semi-annular plates.

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