CN213207906U - Expansion joint for high-temperature flue - Google Patents

Abstract

Provided is an expansion joint for a high-temperature flue, comprising: a first outer cylinder; a second outer barrel; a first inner barrel having a first inner barrel body and a first annular flange; a second inner barrel having a second inner barrel body and a second annular flange; a flexible connection connecting the first outer barrel to the second outer barrel to define an interior space with the first outer barrel and the second outer barrel and to define an edge space adjacent the flexible connection at least with the first inner barrel and the second inner barrel; a first piece of refractory fibrous material filling the marginal space and being capable of accommodating volume changes of the marginal space; and a second piece of refractory fibrous material disposed in the expansion gap between the first and second annular flanges in the axial direction and capable of accommodating volume changes in the expansion gap. The first refractory fiber material piece and the second refractory fiber material piece effectively block the expansion gap and prevent heat loss and high-temperature smoke overflow.

Description

Expansion joint for high-temperature flue

Technical Field

The embodiment of the utility model relates to an expansion joint for high temperature flue.

Background

In a boiler and a flue system, the temperature of the generated high-temperature flue gas is high, so that the deformation of a flue caused by temperature change is inevitably caused. In this case, displacement occurs between the components in the flue, so that an axial or tangential force is generated in the flue, thereby affecting safe and stable operation of the entire system. Expansion joints are connected among various components in the flue (such as among various pipelines and between the pipelines and high-temperature equipment) to absorb axial and tangential displacement, so that axial and tangential loads are reduced, system safety is improved, and system service life is prolonged.

It is desirable to provide an expansion joint which has suitable rigidity and flexibility, is effective in preventing heat loss and smoke outflow, and prevents dust accumulation, and has a long service life.

Disclosure of Invention

At least one embodiment of the utility model provides an expansion joint, it includes: a first outer cylinder; a second outer barrel; a first inner cylinder connected to the first outer cylinder and having a first inner cylinder body and a first annular flange extending in a radial direction from the first inner cylinder body; a second inner cylinder connected to the second outer cylinder and having a second inner cylinder body and a second annular flange extending from the second inner cylinder body in the radial direction; a flexible connection connecting the first outer barrel to the second outer barrel to define an interior space with the first outer barrel and the second outer barrel and to define at least a marginal space adjacent the flexible connection with the first inner barrel and the second inner barrel, the marginal space being included in the interior space; a first piece of refractory fibrous material filling the marginal space and being capable of accommodating volume changes of the marginal space; and a second piece of refractory fibrous material disposed in the expansion gap between the first and second annular flanges in the axial direction and capable of accommodating volume changes of the expansion gap.

The first piece of refractory fibre material thus fills the marginal space, enhancing the insulating properties of the expansion joint, and does not affect the rigidity and flexibility of the flexible joint. The second refractory fiber material part fills the expansion gap, changes along with the change of the volume of the expansion gap, and can prevent high-temperature flue gas from overflowing from the inside of the expansion joint to the outside of the expansion joint through the expansion gap. The first refractory fiber material piece and the second refractory fiber material piece effectively block the expansion gap and prevent heat loss and high-temperature smoke overflow.

For example, in some embodiments, the second piece of refractory fiber material includes a metal skeleton.

For example, in some embodiments, the first piece of refractory fibrous material includes aluminum silicate fibers, the second piece of refractory fibrous material includes a metal skeleton and aluminum silicate fibers filled in the metal skeleton, and the aluminum silicate fibers of the first piece of refractory fibrous material have a density less than a density of the aluminum silicate fibers of the second piece of refractory fibrous material.

For example, in some embodiments, the expansion joint further comprises: a first refractory body disposed on an inner surface of the first outer cylinder and an inner surface of the first inner cylinder body in the interior space; a second refractory body disposed on an inner surface of the second outer cylinder and an inner surface of the second inner cylinder body in the interior space; and a third refractory fibrous material piece disposed in the refractory gap between the first and second bodies in the axial direction and adapted to accommodate a change in volume of the refractory gap.

By providing a third piece of refractory fibre material in the refractory gap, dust is prevented from collecting in the refractory gap, while accommodating volume changes in the refractory gap, allowing the entire pipeline to deform sufficiently. Furthermore, the service life of the expansion joint is increased.

For example, in some embodiments, the third refractory fibrous material is a ceramic fiber blanket.

For example, in some embodiments, the expansion joint further comprises a refractory binder piece adhered to an inside surface of the third piece of refractory fiber material and disposed in the refractory body gap to secure the third piece of refractory fiber material in the refractory gap.

For example, in some embodiments, the refractory binder comprises fireclay.

For example, in some embodiments, the flexible connection is a metal bellows.

For example, in some embodiments, the second inner barrel has an inner diameter greater than an outer diameter of the first inner barrel, the first annular flange extends outwardly from the first inner barrel body in the radial direction, and the second annular flange extends inwardly from the second inner barrel body in the radial direction.

Such a construction and arrangement of the first and second inner barrel bodies allows the expansion joint to have a smaller volume and facilitates assembly and production of the expansion joint.

For example, in some embodiments, the end face of the second body of refractory material forming the refractory gap is inclined from the radial direction.

For example, in some embodiments, an end face of the first body of refractory material forming the refractory gap is parallel to the radial direction.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of protection, and for those skilled in the art, other related drawings can be obtained according to these drawings without inventive efforts.

Fig. 1 shows a cross-sectional view of an expansion joint according to an embodiment of the invention;

FIG. 2 shows an enlarged view of the dashed box portion of FIG. 1;

fig. 3 shows a cross-sectional view of an expansion joint according to another embodiment of the invention.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word covers the element or item listed after the word and its equivalents, without excluding other elements or items. "upper", "lower", "left", "right", etc. are used merely to indicate relative positioning, and when the absolute positioning of the object being described is changed, the relative positioning may also be changed accordingly.

Fig. 1 shows a cross-sectional view of an expansion joint according to an embodiment of the present invention, and fig. 2 shows an enlarged view of a dotted frame portion in fig. 1.

As shown in fig. 1 and 2, the expansion joint includes a first outer cylinder 110, a second outer cylinder 120, a first inner cylinder 140, a second inner cylinder 150, and a flexible connection 130. The first outer cylinder 110 has a first outer cylinder body and a first connecting flange (or first flange) extending radially outward from the first outer cylinder body, and the second outer cylinder 120 has a second outer cylinder body and a second connecting flange (or second flange) extending radially outward from the second outer cylinder body. The expansion joint may be connected between two flue gas pipes, or between one flue gas pipe and one device, by the first connection flange of the first outer cylinder 110 and the second connection flange of the second outer cylinder 120. The first and second outer cylinders 110 and 120 may be made of, for example, carbon steel, austenitic stainless steel, or the like. The flexible connection 130 connects the first outer cylinder 110 to the second outer cylinder 120. For example, the flexible connection 130 is welded between the first and second outer cylinders 110 and 120. The flexible connection 130 may be a metal bellows, which may be made of, for example, austenitic stainless steel or nickel and alloy steel, among others. The metal corrugated pipe has a plurality of corrugated sections to have flexibility. The flexible connection 130, the first outer cylinder 110 and the second outer cylinder 120 together define an inner space. The first and second inner cylinders 140 and 150 are disposed in the inner space. The flexible connection 130 may also have other configurations such that it has flexibility to absorb axial or tangential displacement, but the invention is not limited thereto.

The first inner cylinder 140 is connected to the first outer cylinder 110, for example, welded to the first outer cylinder 110. The second inner barrel 150 is connected to the second outer barrel 120, e.g., welded to the second outer barrel 120. At least the first inner cylinder 140, the second inner cylinder 150, and the flexible joint 130 collectively define an edge space adjacent the flexible joint 130. For example, the first and second inner cylinders 140 and 150 may be made of carbon steel or austenitic stainless steel, respectively.

In the present embodiment, the first inner cylinder 140 has a first inner cylinder body 141 and a first annular flange 142 extending outward in a radial direction from the first inner cylinder body 141. The first inner cylinder body 141 is connected to the first outer cylinder 110 through the first annular flange 142. The second inner cylinder 150 has a second inner cylinder body 151 and a second annular flange 152 extending inward in the radial direction from the second inner cylinder body 151. The second inner cylinder body 151 extends beyond the second outer cylinder 120 in the axial direction and overlaps the flexible connection 130 in the radial direction, the second annular flange 152 being at the free end of the second inner cylinder body 151. The outer diameter of the first inner cylinder body 141 is smaller than the inner diameter of the second inner cylinder body 151. In the radial direction, the first and second inner cylinder bodies 141 and 151 may partially overlap. For example, the second inner cylinder body 151 may be interposed between the first inner cylinder body 141 and the first outer cylinder 110 in a radial direction such that the first and second inner cylinder bodies 141 and 151 partially overlap. Such a configuration and arrangement of the first and second inner barrel bodies 141 and 151 allows the expansion joint to have a smaller volume and facilitates assembly and production of the expansion joint.

It will be appreciated by those skilled in the art that the first and second inner cylinders 140, 150 can have other configurations or arrangements. For example, the first inner cylinder body 141 may extend a longer distance in the axial direction to exceed the first outer cylinder 110, and the second inner cylinder body 151 may extend a shorter distance in the axial direction. For example, the first annular flange 142 may extend inward in the radial direction, or the first annular flange 142 may be provided at the free end of the first inner cylinder body 141. For example, the first and second inner cylinder bodies 141 and 151 may not overlap.

An expansion gap is defined in the axial direction between first annular flange 142 and second annular flange 152.

During operation of the flue gas flow system, high temperature flue gas will flow in the expansion joint and the pipeline in which it is located. The expansion joint and the pipeline in which it is located will be at a temperature well above ambient due to the heat carried by the flue gas. For example, during hot operation, the volume of the expansion gap may become 1/2 the volume of the expansion gap at room temperature, and the volume of the edge space will change accordingly. Furthermore, due to aged deformation of the material or the like as the system operates, the volume of the expansion gap may gradually become larger, and the volume of the edge space will also change. In addition, the expansion joint may also be deformed by other external forces, resulting in deformation of the expansion gap and the edge space.

In at least embodiments of the present invention, the expansion joint further comprises a first piece of refractory fiber material 181 and a second piece of refractory fiber material 182. The first piece of refractory fiber material 181 fills the edge space and is able to accommodate changes in the volume of the edge space. The second piece of refractory fiber material 182 fills the expansion gap and is able to accommodate volume changes in the expansion gap. Thus, the first refractory fiber material member 181 fills the edge space, provides heat insulating properties, and does not affect the rigidity and flexibility of the flexible connecting portion 130. The second piece 182 of refractory fiber material fills the expansion gap and changes as the volume of the expansion gap changes, preventing high temperature flue gas from escaping from the interior of the expansion joint through the expansion gap to the exterior of the expansion joint.

The first piece of refractory fibrous material 181 is resilient so as to fill the marginal space and accommodate changes in volume of the marginal space. For example, the first piece of refractory fiber material 181 may comprise a first refractory fiber material, such as aluminum silicate fibers. The aluminum silicate fiber has high heat insulation performance and certain rigidity and flexibility, prevents heat loss of the expansion joint, and ensures the rigidity and flexibility of the flexible connecting part 130.

The second piece of refractory fiber material 182 is resilient to fill the expansion gap and accommodate changes in the volume of the expansion gap. For example, the second piece of refractory fiber material 182 may include a metal skeleton. The metal skeleton is, for example, austenitic stainless steel. Furthermore, the second refractory fiber material piece 182 comprises, for example, aluminum silicate fibers filled in a metal skeleton. The metal framework enhances the elasticity of the second refractory fiber material piece 182, so that the second refractory fiber material piece 182 has good resilience performance while ensuring higher heat insulation performance, and effectively blocks the expansion gap, thereby preventing the smoke from overflowing.

For example, the density of the alumina silicate fibers of the first refractory fibrous material element 181 is less than the density of the alumina silicate fibers of the second refractory fibrous material element 182. On the one hand, the lower density of the aluminium silicate fibres allows for a greater flexibility of the first piece of refractory fibre material 181, thereby contributing to the rigidity of the flexible connection 130 without reducing the rigidity of the edge space near the flexible connection 130. In addition, the lower density of the aluminum silicate fibers also has higher heat insulation performance. On the other hand, the higher density of the aluminium silicate fibres allows the second piece of refractory fibre material 182 to have a higher resilience, thereby effectively blocking the expansion gap.

In addition, the expansion joint comprises a first body of refractory material 160 and a second body of refractory material 170. The first refractory body 160 is provided in an inner space thereof on an inner surface of the first outer cylinder 110 and an inner surface of the first inner cylinder body 141. A second refractory body 170 is disposed on an inner surface of the second outer cylinder 120 and an inner surface of the second inner cylinder body 151 in the inner space. The first body 160 and the second body 170 of refractory material may be the same or different. The materials of the first refractory body and the second refractory body 170 may be selected as desired. For example, in the present example, the first body 160 and the second body 170 are aluminum silicate refractory castable. In other examples, the first and second bodies 160, 170 may be other refractory materials, for example, magnesium-based refractory materials or other aluminum-based refractory materials.

A refractory gap is defined in the axial direction between the first body 160 and the second body 170. The volume of the refractory gap will also change due to temperature changes, external forces, etc.

In at least one embodiment of the present invention, the expansion joint further comprises a third piece 183 of refractory fibrous material and a piece 184 of refractory bonding material. The third refractory fiber material piece 183 is disposed in the refractory gap and is capable of accommodating volume changes of the refractory gap. A refractory bond material piece 184 is adhered to the inside surface of the third refractory fiber material piece 183 and is disposed in the refractory body gap to secure the third refractory fiber material piece 183 in the refractory gap.

The expansion joint of the embodiment of the utility model is particularly suitable for the flue gas pipeline of the flue gas of high dust content wherein flows. The high dust content flue gas has a significant amount of dust which can collect in the refractory gap between the first and second refractory bodies 160, 170 and form a non-resilient block. By providing the third refractory fiber material piece 183 in the refractory gap, dust is prevented from collecting in the refractory gap while accommodating the volume change of the refractory gap, allowing the entire pipeline to be sufficiently deformed. Furthermore, the service life of the expansion joint is increased. The refractory bonding material 184 effectively secures the third refractory fibrous material 183 to prevent the third refractory fibrous material 183 from falling out. The refractory bonding material 184 protects the third refractory fiber material 183, increases the service life of the expansion joint, and reduces the use cost.

The third refractory fiber material piece 183 has elasticity to fill in the refractory gap and be able to accommodate changes in the volume of the refractory gap. For example, the third refractory fiber material piece 183 may comprise a ceramic fiber blanket or the like. The ceramic fiber blanket has high compressibility and integrity, allows the entire pipeline to be sufficiently deformed, and effectively prevents dust from collecting. The refractory bonding material 184 is cementitious. For example, the piece 184 of refractory bonding material comprises fireclay. The fire clay is cementitious and effectively blocks and secures the third piece 183 of refractory fibrous material. During the use of the expansion joint, the fireclay may crack, etc. In this case, the fireclay can be replaced regularly instead of replacing the whole expansion joint, so that the use cost is saved.

In summary, in the embodiment shown in fig. 1 and 2, the edge space, the expansion gap and the refractory material gap, the volume of which may be changed constantly, are filled by the first refractory fiber material element 181, the second refractory fiber material element 182, the third refractory fiber material element 183 and the refractory bonding material element 184, so that the expansion joint is prevented from being deformed, the heat loss of the expansion joint is better prevented, the flue gas is prevented from overflowing, and the dust in the flue gas is prevented from gathering.

As shown in fig. 1 and 2, the end surface of the first refractory body 160 forming the refractory gap is parallel to the radial direction. The end face of the second refractory body 170 forming the refractory gap is inclined from the radial direction. The flue gas is configured to flow from the interior of the first body of refractory material 160 toward the interior of the second body of refractory material 170 (i.e., from left to right in fig. 1 and 2). In this case, the flue gas will not easily escape, and dust will not easily collect in the refractory gaps.

In addition, the expansion joint may further include a stopper 191 connecting the first outer cylinder 110 to the second outer cylinder 120 at the outside of the expansion joint. The stop rod 191 limits axial contraction and pre-stresses filler material pieces such as the first refractory fiber material piece 181, the second refractory fiber material piece 182, the third refractory fiber material piece 183, or the refractory binder material piece 184 during transportation or installation.

In addition, the expansion joint may further include a plurality of anchors 192 connected to one or more of the first outer cylinder 110, the second outer cylinder 120, the first inner cylinder 140, and the second inner cylinder 150, respectively, at intervals from each other inside the respective parts, and the first and second refractory bodies 160 and 170 are formed to cover the plurality of anchors 192. The anchors 192 enhance the strength of the first and second bodies 160, 170 and better attach the first and second bodies 160, 170 to the first and second outer cylinders 110, 120, 140, 150.

Fig. 3 shows a cross-sectional view of an expansion joint according to another embodiment of the invention.

For the sake of brevity, components of the embodiment shown in FIG. 3 that are the same as or similar to the embodiment shown in FIGS. 1 and 2 will not be described in detail. As shown in fig. 3, the expansion joint includes a first outer cylinder 211, a second outer cylinder 212, a third outer cylinder 213, a first inner cylinder 221 connected to the first outer cylinder 211, a second inner cylinder 222 connected to the second outer cylinder 212, a third inner cylinder 223 connected to the second outer cylinder 212, a fourth inner cylinder 224 connected to the third outer cylinder 213, a first flexible connection 231 connecting the first outer cylinder 211 to the second outer cylinder 212, a second flexible connection 232 connecting the second outer cylinder 212 to the third outer cylinder 213, a first refractory 241, a second refractory 242, and a third refractory 243. Unlike the embodiment shown in fig. 1 and 2, the expansion joint in the embodiment shown in fig. 3 further comprises a third outer cylinder 213, a third inner cylinder 223, a fourth inner cylinder 224, a second flexible joint 232 and a third body of refractory material 243.

As shown in fig. 3, the first inner cylinder 221 includes a first inner cylinder body and a first annular flange extending radially outward from the first inner cylinder body, the second inner cylinder 222 includes a second inner cylinder body and a second annular flange extending radially inward from a free end of the second inner cylinder body, the third inner cylinder 223 includes a third inner cylinder body and a third annular flange extending radially outward from the third inner cylinder body, and the fourth inner cylinder 224 includes a fourth inner cylinder body and a fourth annular flange extending radially inward from a free end of the fourth inner cylinder body. The first refractory fiber material piece 250 is filled in the marginal space defined by the first inner cylinder 221, the second inner cylinder 222, and the first flexible coupling 231, and an additional first refractory fiber material piece 250' is filled in the marginal space defined by the third inner cylinder 223, the fourth inner cylinder 224, and the second flexible coupling 232. A second piece of refractory fibrous material 260 is disposed in the expansion gap between the first and second annular flanges. An additional second piece 260' of refractory fibrous material is disposed in the additional expansion gap between the third and fourth annular flanges. A third refractory fibrous material piece 270 and a refractory bond material piece 280 are disposed in the refractory gap between the first refractory body 241 and the second refractory body 242, and an additional third refractory fibrous material piece 270 'and an additional refractory bond material piece 280' are disposed in the refractory gap between the second refractory body 242 and the third refractory body 243.

Different configurations of the expansion joint, for example the configuration shown in figures 1 and 2 or the configuration shown in figure 3, may be selected as desired, for example, depending on the length of the expansion joint.

The scope of the present invention is defined not by the embodiments described above but by the appended claims and their equivalents.

Claims (10)

1. An expansion joint for a high-temperature flue, comprising:

a first outer cylinder;

a second outer barrel;

a first inner cylinder connected to the first outer cylinder and having a first inner cylinder body and a first annular flange extending in a radial direction from the first inner cylinder body;

a second inner cylinder connected to the second outer cylinder and having a second inner cylinder body and a second annular flange extending from the second inner cylinder body in the radial direction;

a flexible connection connecting the first outer barrel to the second outer barrel to define an interior space with the first outer barrel and the second outer barrel and to define at least a marginal space adjacent the flexible connection with the first inner barrel and the second inner barrel, the marginal space being included in the interior space;

a first piece of refractory fibrous material filling the marginal space and being resilient to be able to accommodate changes in volume of the marginal space;

a second piece of refractory fibrous material disposed in the expansion gap between the first and second annular flanges in the axial direction and having elasticity to be able to accommodate volume changes of the expansion gap.

2. The expansion joint according to claim 1,

the second piece of refractory fiber material includes a metal skeleton.

3. The expansion joint according to claim 1,

the first refractory fiber material piece comprises aluminum silicate fibers, the second refractory fiber material piece comprises a metal framework and aluminum silicate fibers filled in the metal framework,

the density of the alumino-silicate fibres of the first piece of refractory fibre material is less than the density of the alumino-silicate fibres of the second piece of refractory fibre material.

4. The expansion joint of claim 1, further comprising

A first refractory body disposed on an inner surface of the first outer cylinder and an inner surface of the first inner cylinder body in the interior space;

a second refractory body disposed on an inner surface of the second outer cylinder and an inner surface of the second inner cylinder body in the interior space; and

a third piece of refractory fiber material disposed in a refractory gap and adapted to accommodate a volume change of the refractory gap, the refractory gap disposed between the first body of refractory material and the second body of refractory material in the axial direction.

5. The expansion joint according to claim 4,

the third piece of refractory fibrous material is a ceramic fiber blanket.

6. The expansion joint according to claim 4, further comprising:

a refractory binder member adhered to an inside surface of the third piece of refractory fiber material and disposed in the refractory body gap to secure the third piece of refractory fiber material in the refractory gap.

7. The expansion joint according to claim 1,

the flexible connecting part is a metal corrugated pipe.

8. The expansion joint according to claim 1,

the second inner barrel has an inner diameter greater than an outer diameter of the first inner barrel, the first annular flange extends outwardly from the first inner barrel body in the radial direction, and the second annular flange extends inwardly from the second inner barrel body in the radial direction.

9. The expansion joint according to claim 4,

the end face of the second body of refractory material forming the refractory gap is inclined from the radial direction.

10. The expansion joint according to claim 9,

an end surface of the first refractory body forming the refractory gap is parallel to the radial direction.

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