Heat preservation and insulation layer supporting device in steel chimney

Abstract

The utility model discloses a supporting device for heat preservation and insulation layers in a steel chimney, the steel chimney comprises an upper steel chimney section and a lower steel chimney section, heat preservation and insulation layers are arranged on the inner wall of the upper steel chimney section and the inner wall of the lower steel chimney section, and an annular supporting base is arranged between the heat preservation and insulation layers of the upper steel chimney section and the lower steel chimney section. The heat preservation and insulation layer of the upper section of steel chimney is supported on the top of the annular supporting base, the outer wall of the annular supporting base is fixedly connected with the inner wall of the steel chimney, and a connecting flange for connecting the upper section of steel chimney and the lower section of steel chimney together is arranged on the outer cylinder wall at the joint of the upper section of steel chimney and the lower section of steel chimney. An uncompressed refractory fiber felt is arranged between the bottom of the annular supporting base and the top of the heat preservation and insulation layer of the lower section of steel chimney, and a compressed refractory fiber felt is arranged between the top of the annular supporting base and the bottom of the heat preservation and insulation layer of the upper section of steel chimney. The problems that a traditional heat preservation layer is prone to falling off, heat stress is concentrated, and installation is complex are solved. And the times of shutdown inspection and replacement and maintenance caused by falling of the thermal insulation layer are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of steel chimney inner heat preservation heat insulation layer supporting device, belong to industrial chimney structure technical field. BACKGROUND

[0002] Traditional steel chimney heat preservation layer often uses welding anchor or bandage to fix, and such fixing mode has the following problems: 1. Rigid connection leads to heat expansion and contraction, and heat preservation layer is easy to crack or fall off;2. Welding connection is easy to damage steel chimney anticorrosive coating, thereby accelerating steel chimney corrosion;3. Welding anchor or bandage fixing installation process is complex, and later maintenance is more difficult.Therefore, a kind of heat preservation heat insulation layer supporting structure that can adapt to thermal deformation, reduce thermal bridge effect and facilitate construction is related, which improves the heat resistance temperature of chimney and prolongs the service life of chimney, which becomes the technical problem to be solved in the industry. SUMMARY

[0003] The utility model aims at providing a kind of steel chimney inner heat preservation heat insulation layer supporting device.The supporting structure can adapt to thermal deformation, reduce thermal bridge effect and facilitate construction, which not only can improve the heat resistance temperature of chimney, but also can prolong the service life of chimney.

[0004] The technical scheme of the utility model: a kind of steel chimney inner heat preservation heat insulation layer supporting device, the steel chimney includes the upper section steel chimney and lower section steel chimney adjacently arranged, the inner wall of upper section steel chimney and lower section steel chimney is provided with heat preservation heat insulation layer, annular support base is arranged between the heat preservation heat insulation layer of upper section steel chimney and lower section steel chimney, the heat preservation heat insulation layer of upper section steel chimney is supported in the top of annular support base, the outer wall of annular support base is fixedly connected with the inner wall of steel chimney, the outer cylinder wall at the joint of upper section steel chimney and lower section steel chimney is provided with the connecting flange that connects the two together, the bottom of annular support base and the top of the heat preservation heat insulation layer of lower section steel chimney are provided with uncompressed refractory fiber felt, and the top of annular support base and the bottom of the heat preservation heat insulation layer of upper section steel chimney are provided with compressed refractory fiber felt;

[0005] The top end inner side of the annular support base is equipped with upward convex ring, and the convex ring wraps the lower end of the outer wall of the heat preservation heat insulation layer of upper section steel chimney, and uncompressed refractory fiber felt is arranged between the convex ring and the heat preservation heat insulation layer;

[0006] The annular support base is made of refractory castable, and radial ring steel mesh is arranged in the refractory castable, and the end of the radial ring steel mesh is welded and fixed with the inner wall of steel chimney.

[0007] In the foregoing steel chimney inner heat preservation heat insulation layer supporting device, the thickness of the annular support base is at least 200mm greater than the thickness of the heat preservation heat insulation layer;The height of the convex ring is greater than or equal to 200mm.

[0008] In the aforementioned steel chimney inner thermal insulation layer supporting device, the top surface of the annular supporting base is provided with single-layer annular stiffening ribs, the middle part is provided with double-layer annular stiffening ribs, and the compressed refractory fiber felt is arranged between the double-layer annular stiffening ribs, the middle line of the refractory fiber felt is in the same plane as the end surface of the joint of the upper section steel chimney and the lower section steel chimney, and the end of the annular stiffening rib is welded and fixed to the inner wall of the steel chimney.

[0009] In the aforementioned steel chimney inner thermal insulation layer supporting device, the annular supporting base is further provided with a plurality of vertical stiffening ribs.

[0010] In the aforementioned steel chimney inner thermal insulation layer supporting device, the vertical stiffening ribs are provided with two layers, and are arranged in the annular supporting bases above and below the plane of the joint of the upper section steel chimney and the lower section steel chimney, and the outer side surface of the vertical stiffening rib is welded and fixed to the inner wall of the steel chimney.

[0011] Compared with the prior art, the technical scheme of the utility model forms a thermal insulation layer supporting structure which can adapt to thermal deformation, reduce thermal bridge effect and facilitate construction, can solve the problems of easy falling of the traditional thermal insulation layer, thermal stress concentration and complex installation, and can reduce the number of shutdown inspection and replacement and maintenance caused by falling of the thermal insulation layer. The thermal insulation layer supporting structure is suitable for high-temperature chimneys (flue gas temperature > 600 DEG C) such as graphitization and power plants, and is especially suitable for high-humidity corrosion environments along the coast. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic view of the utility model;

[0013] Figure 2 It is a plane schematic view of the joint of the upper section steel chimney and the lower section steel chimney;

[0014] Figure 3 It is Figure 2 a cross-sectional schematic view.

[0015] Fig. 1 is an upper section steel chimney, Fig. 2 is a lower section steel chimney, Fig. 3 is a thermal insulation layer, Fig. 4 is an annular supporting base, Fig. 5 is a connecting flange, Fig. 6 is a refractory fiber felt, Fig. 7 is a convex ring, Fig. 8 is an annular stiffening rib, Fig. 9 is a vertical stiffening rib, Fig. 10 is refractory castable, and Fig. 11 is a radial ring steel mesh. DETAILED DESCRIPTION

[0016] The utility model will be further described below in combination with the drawings and examples, but it is not as the basis for limiting the utility model.

[0017] The utility model discloses an embodiment: a steel chimney inner heat -preserving and heat -insulating layer support device, the steel chimney includes the upper section steel chimney 1 and lower section steel chimney 2 of adjacent setting, the inner wall of upper section steel chimney 1 and lower section steel chimney 2 all is provided with heat -preserving and heat -insulating layer 3, and the heat -preserving and heat -insulating layer 3 of upper section steel chimney 1 and lower section steel chimney 2 is provided with annular support base 4 between it, this annular support base 4 sets up in the inside of steel chimney, the heat -preserving and heat -insulating layer 3 of upper section steel chimney 1 supports at the top of annular support base 4, and the outer wall of annular support base 4 is fixedly connected with the inner wall of steel chimney, avoids annular support base 4 and press on the heat -preserving and heat -insulating layer 3 of lower section steel chimney 2, and the outer cylinder wall of upper section steel chimney 1 and lower section steel chimney 2 joint is all provided with the connecting flange 5, and the bolt passes through the connecting flange 5 of both can fix together with lower section steel chimney 2 and upper section steel chimney 1 of upper section steel chimney 1 and lower section steel chimney 2 fixed connection.

[0018] Wherein, when the heat -preserving and heat -insulating layer 3 of lower section steel chimney 2 is built, and the annular support base 4 bottom and the heat -preserving and heat -insulating layer 3 between lower section steel chimney 2 leave 20mm gap, the gap is used to fill the fire -resistant fibre felt 6 that has not been compressed. Since the annular support base 4 is fixed on the inner wall of the steel chimney, the fire -resistant fibre felt 6 between the bottom of the annular support base 4 and the top of the heat -preserving and heat -insulating layer 3 of the lower section steel chimney 2 will not be compressed. Since the fire -resistant fibre felt 6 is provided, the gap between the heat -preserving and heat -insulating layer 3 and the bottom of the annular support base 4 is filled. Since the fire -resistant fibre felt 6 is not compressed, it has a certain elasticity. When the heat -preserving and heat -insulating layer 3 of the lower section steel chimney 2 expands, the fire -resistant fibre felt 6 provides a certain expansion deformation space for the heat -preserving and heat -insulating layer 3. When the heat -preserving and heat -insulating layer 3 cools and shrinks, the fire -resistant fibre felt 6 can fill the gap and achieve sealing.

[0019] The top of the annular support base 4 and the bottom of the heat -preserving and heat -insulating layer 3 of the upper section steel chimney 1 are provided with the fire -resistant fibre felt 6 that has been compressed. After the fire -resistant fibre felt 6 is set, the heat -preserving and heat -insulating layer 3 of the upper section steel chimney 1 is built on top of it. Since the fire -resistant fibre felt 6 is compressed, it can ensure the stability of the structure of the built heat -preserving and heat -insulating layer 3. The fire -resistant fibre felt 6 can fill the gap between the annular support base 4 and the heat -preserving and heat -insulating layer 3 of the upper section steel chimney 1 and achieve sealing. The annular support base 4 is fixed on the inner wall of the steel chimney, so it can support the heat -preserving and heat -insulating layer 3 of the upper section steel chimney 1.

[0020] The top end inner side of the annular support base 4 is provided with an upward convex ring 7, which wraps the lower end of the outer wall of the thermal insulation layer 3 of the upper section steel chimney 1, and the uncompressed refractory fiber felt 6 is arranged between the convex ring 7 and the thermal insulation layer 3. The inner side of the thermal insulation layer 3 can be protected and sealed by the convex ring 7, and the compressed refractory fiber felt 6 can fill the gap between the two to ensure the sealing performance. The convex ring 7 can well support and protect the side of the thermal insulation layer 3 and give the thermal insulation layer 3 a certain expansion deformation space after heating.

[0021] The annular support base 4 is cast by refractory castable 10, so that the annular support base 4 has good fire resistance. The inner part of the refractory castable 10 is provided with a radial ring steel mesh 11, so that the annular support base 4 obtained by casting has good structural stability. The end of the radial ring steel mesh 11 is welded and fixed to the inner wall of the steel chimney, so that the annular support base 4 and the steel chimney can be well fixed and connected together, avoiding the downward displacement of the annular support base 4 under the action of gravity.

[0022] The thickness of the annular support base 4 is at least 200mm greater than the thickness of the thermal insulation layer 3, so that the annular support base 4 has good fire protection effect. The height of the convex ring 7 is greater than or equal to 200mm, so that the convex ring 7 has good sealing effect.

[0023] The top surface of the annular support base 4 is provided with a single-layer annular stiffening rib 8, and the middle part is provided with a double-layer annular stiffening rib 8. The compressed refractory fiber felt 6 is arranged between the double-layer annular stiffening ribs 8 in the middle part. The middle line of the refractory fiber felt 6 is exactly in the same plane as the end face of the joint between the upper section steel chimney 1 and the lower section steel chimney 2. The end of the annular stiffening rib 8 is welded and fixed to the inner wall of the steel chimney. The annular stiffening rib 8 can enhance the structural strength of the annular support base 4. The middle part is provided with a double-layer annular stiffening rib 8, which mainly clamps and fixes the refractory fiber felt 6 in the middle. The refractory fiber felt 6 is mainly used for sealing the joint gap between the upper section steel chimney 1 and the lower section steel chimney 2. Since the annular support base 4 will not deform under heat, the compressed refractory fiber felt 6 is arranged between the double-layer annular stiffening ribs 8, which can better realize sealing. The end of the annular stiffening rib 8 is welded and fixed to the inner wall of the steel chimney, and the annular stiffening rib 8 is fixed and connected with the annular support base 4, so that the annular support base 4 is better connected and fixed with the steel chimney.

[0024] The annular support base 4 is also provided with a plurality of vertical stiffening ribs 9 arranged in a ring shape inside, which can improve the structural strength of the annular support base 4.

[0025] The vertical stiffening ribs 9 are provided with two layers, which are respectively arranged in the annular support bases 4 above and below the joint plane of the upper section steel chimney 1 and the lower section steel chimney 2, and the outer side of the vertical stiffening ribs 9 is welded and fixed with the inner wall of the steel chimney. The vertical stiffening ribs 9 provided with double layers can better improve the structural strength of the annular support base 4, and the vertical stiffening ribs 9 are welded and fixed with the inner wall of the steel chimney, so as to ensure that the annular support base 4 and the steel chimney are fixedly connected together.

[0026] During the construction process, taking a 60-80m high temperature steel chimney as an example, the cylinder wall of the steel chimney is divided into several sections during the design, each section is about 5m, and the annular stiffening ribs 8 and the vertical stiffening ribs 9 of each section of the cylinder wall are directly welded on the inner cylinder wall of the steel chimney on the ground or in the factory. The first and second sections of the steel chimney are hoisted and installed, the radial steel mesh 11 and the refractory castable 10 of the annular support base 4 are constructed after the first and second sections of the steel chimney are installed, and finally the insulation layer 3 of the first and second sections of the steel chimney is constructed after the annular support base 4 reaches the design strength. Then the third section of the steel chimney is hoisted and installed, the annular support base 4 between the second and third sections of the steel chimney is constructed, and then the insulation layer 3 of the third section of the steel chimney is constructed, and so on.

Claims

1. A support device for a thermal insulation layer in a steel chimney, said steel chimney comprising an upper steel chimney section (1) and a lower steel chimney section (2) arranged adjacent to each other, characterized in that: The inner wall of the upper steel chimney (1) and the lower steel chimney (2) is provided with a heat preservation layer (3), and the heat preservation layer (3) of the upper steel chimney (1) and the lower steel chimney (2) is provided with an annular support base (4), the heat preservation layer (3) of the upper steel chimney (1) is supported on the top of the annular support base (4), the outer wall of the annular support base (4) is fixedly connected with the inner wall of the steel chimney, the outer cylinder wall at the joint of the upper steel chimney (1) and the lower steel chimney (2) is provided with a connecting flange (5) connecting the two together, the bottom of the annular support base (4) and the top of the heat preservation layer (3) of the lower steel chimney (2) are provided with uncompressed refractory fiber felt (6), and the top of the annular support base (4) and the bottom of the heat preservation layer (3) of the upper steel chimney (1) are provided with compressed refractory fiber felt (6); The inner side of the top end of the annular support base (4) is provided with an upward convex ring (7), the convex ring (7) wraps the lower end of the outer wall of the heat preservation layer (3) of the upper steel chimney (1), and the uncompressed refractory fiber felt (6) is arranged between the convex ring (7) and the heat preservation layer (3); The annular support base (4) is formed by pouring refractory castable (10), and the refractory castable (10) is provided with a radial ring steel mesh (11) inside, and the end of the radial ring steel mesh (11) is welded and fixed with the inner wall of the steel chimney.

2. A steel chimney inner thermal insulation support device according to claim 1, characterized in that: The thickness of the annular support base (4) is at least 200mm greater than the thickness of the heat preservation layer (3); the height of the convex ring (7) is greater than or equal to 200mm.

3. A steel chimney inner thermal insulation support device according to claim 1, characterized in that: The top surface of the annular support base (4) is provided with a single-layer annular stiffening rib (8), the middle part is provided with a double-layer annular stiffening rib (8), the compressed refractory fiber felt (6) is arranged between the double-layer annular stiffening ribs (8) in the middle part, the middle line of the refractory fiber felt (6) is just in the same plane as the end face of the joint of the upper steel chimney (1) and the lower steel chimney (2), and the end of the annular stiffening rib (8) is welded and fixed with the inner wall of the steel chimney.

4. A steel chimney inner thermal insulation support device according to claim 1, characterized in that: A plurality of vertical stiffening ribs (9) are annularly arranged inside the annular support base (4).

5. A steel chimney inner thermal insulation support device according to claim 4, characterized in that: The vertical stiffening rib (9) is provided with two layers, above the joint plane of the upper steel chimney (1) and the lower steel chimney (2), the vertical stiffening rib (9) is arranged in the annular support base (4) above and below, respectively, and the outer side of the vertical stiffening rib (9) is welded and fixed with the inner wall of the steel chimney.

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