Elastic supporting structure of heat insulation layer in steel chimney

Abstract

The application discloses a kind of elastic supporting structure of steel chimney inner heat insulation layer, steel chimney includes upper section steel chimney and lower section steel chimney, the inner wall of upper section steel chimney and lower section steel chimney is provided with heat insulation layer, and the heat insulation layer between upper section steel chimney and lower section steel chimney is provided with annular support base, the heat insulation layer of upper section steel chimney is supported in the top of annular support base, and the outer wall of annular support base is fixedly connected with the inner wall of steel chimney, the outer cylinder wall of upper section steel chimney joint is provided with the connecting flange of being connected together, and the bottom of annular support base and the top of the 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 insulation layer of upper section steel chimney are provided with compressed refractory fiber felt.The application solves the problems of traditional heat insulation layer, such as easy to fall off, thermal stress concentration, complex installation and the like.Reduce the number of shutdown inspection and replacement maintenance caused by the falling of heat insulation layer.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of steel chimney inner thermal insulation layer elastic supporting structure, belong to industrial chimney structure technical field. BACKGROUND

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

[0003] The purpose of the present application is to provide a kind of steel chimney inner thermal insulation layer elastic supporting structure. The supporting structure can adapt to thermal deformation, reduce heat bridge effect and facilitate construction, which not only improves the heat resistance temperature of chimney, but also prolongs the service life of chimney.

[0004] The technical scheme of the present application: a kind of steel chimney inner thermal insulation layer elastic supporting structure, the steel chimney includes adjacent upper section steel chimney and lower section steel chimney, the inner wall of upper section steel chimney and lower section steel chimney is provided with thermal insulation layer, the thermal insulation layer of upper section steel chimney and lower section steel chimney is provided with annular support base, the thermal insulation layer of upper section steel chimney is supported on 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 of the joint of upper section steel chimney and lower section steel chimney is provided with connecting flange connecting the two together, the bottom of annular support base and the top of the thermal 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 thermal insulation layer of upper section steel chimney are provided with compressed refractory fiber felt;

[0005] The top surface of the annular support base is provided with single-layer annular stiffening rib, and the middle part is provided with double-layer annular stiffening rib, and the compressed refractory fiber felt is arranged between the double-layer annular stiffening ribs in the middle part, the middle line of the refractory fiber felt is just in the same plane with the end face of the joint of upper section steel chimney and lower section steel chimney, and the end of annular stiffening rib is welded and fixed with the inner wall of steel chimney.

[0006] The annular support base is further provided with a plurality of vertical stiffening ribs in annular array.

[0007] The top end of the annular support base is provided with an upward protruding ring which wraps the lower end of the outer wall of the thermal insulation layer of the upper section steel chimney, and the protruding ring is provided with uncompressed refractory fiber felt between the protruding ring and the thermal insulation layer.

[0008] The thickness of the annular support base is at least 200mm greater than the thickness of the thermal insulation layer, and the height of the protruding ring is greater than or equal to 200mm.

[0009] The vertical stiffening ribs are provided with two layers, and are arranged in the annular support bases above and below the joint plane between the upper section steel chimney and the lower section steel chimney, and the outer side surface of the vertical stiffening ribs is welded and fixed to the inner wall of the steel chimney.

[0010] The annular support base is formed by pouring refractory castable, and the refractory castable is provided with a radial ring steel mesh inside, and the end of the radial ring steel mesh is welded and fixed to the inner wall of the steel chimney.

[0011] Compared with the prior art, the technical scheme of the present application forms a thermal insulation layer support 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 support structure is suitable for high-temperature chimneys (flue gas temperature > 600℃) 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 The figure is a structural schematic diagram of the present application;

[0013] Figure 2 The figure is a plan view of the connection between the upper section and the lower section of the steel chimney;

[0014] Figure 3 The figure is Figure 2 The figure is a sectional view of B-B.

[0015] Reference signs: 1-upper section steel chimney, 2-lower section steel chimney, 3-thermal insulation layer, 4-annular support base, 5-connection flange, 6-refractory fiber felt, 7-protruding ring, 8-annular stiffening rib, 9-vertical stiffening rib, 10-refractory castable, 11-radial ring steel mesh. DETAILED DESCRIPTION

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

[0017] The embodiment of the present application: a steel chimney inner thermal insulation layer elastic support structure, the steel chimney comprises adjacent upper section steel chimney 1 and lower section steel chimney 2, the inner wall of upper section steel chimney 1 and lower section steel chimney 2 is provided with thermal insulation layer 3, annular support base 4 is arranged between the thermal insulation layer 3 of upper section steel chimney 1 and lower section steel chimney 2, the annular support base 4 is arranged in the inside of steel chimney, the thermal insulation layer 3 of upper section steel chimney 1 is supported on the top of annular support base 4, the outer wall of annular support base 4 is fixedly connected with the inner wall of steel chimney, to avoid that annular support base 4 is pressed on the thermal insulation layer 3 of lower section steel chimney 2, the outer cylinder wall at the joint of upper section steel chimney 1 and lower section steel chimney 2 is provided with connecting flange 5, and the upper section steel chimney 1 and lower section steel chimney 2 can be fixedly connected together by the bolt passing through the connecting flanges 5 of both.

[0018] Wherein, when the thermal insulation layer 3 of lower section steel chimney 2 is built, 20mm gap is left between the bottom of annular support base 4 and the thermal insulation layer 3 of lower section steel chimney 2, which is used to fill the uncompressed refractory fiber felt 6. Since the annular support base 4 is fixed on the inner wall of steel chimney, the refractory fiber felt 6 between the bottom of annular support base 4 and the top of thermal insulation layer 3 of lower section steel chimney 2 is not compressed. Since the refractory fiber felt 6 is arranged, the gap between the thermal insulation layer 3 and the bottom of annular support base 4 is filled, and since the refractory fiber felt 6 is not compressed, it has a certain elasticity. When the thermal insulation layer 3 of lower section steel chimney 2 is heated and expanded, the refractory fiber felt 6 provides a certain expansion deformation space for the thermal insulation layer 3. When the thermal insulation layer 3 is cooled and shrunk, the refractory fiber felt 6 can fill and seal the gap.

[0019] The refractory fiber felt 6 arranged between the top of annular support base 4 and the bottom of thermal insulation layer 3 of upper section steel chimney 1 is compressed. After the refractory fiber felt 6 is arranged, the thermal insulation layer 3 of upper section steel chimney 1 is built above it. Since the refractory fiber felt 6 is compressed, it can ensure the stability of the structure of the built thermal insulation layer 3, and it can fill and seal the gap between the annular support base 4 and the thermal insulation layer 3 of upper section steel chimney 1. Since the annular support base 4 is fixed on the inner wall of steel chimney, it can support the thermal insulation layer 3 of 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 through the convex ring 7, the gap between the two can be filled by the compressed refractory fiber felt 6, the sealing performance is guaranteed, the side of the thermal insulation layer 3 can be well supported and protected through the convex ring 7, and a certain expansion deformation space is given to the thermal insulation layer 3 after heating.

[0021] The thickness of the annular support base 4 is at least 200mm larger than the thickness of the thermal insulation layer 3, so that the annular support base 4 has good fireproofing 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.

[0022] 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 middle part of the double-layer annular stiffening rib 8 is provided with a compressed refractory fiber felt 6, the middle line of the refractory fiber felt 6 is in the same plane as the end surface of the joint between the upper section steel chimney 1 and the lower section steel chimney 2, and 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 through the two annular stiffening ribs 8. 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 after heating, the compressed refractory fiber felt 6 is arranged between the double-layer annular stiffening ribs 8, so that the sealing can be better achieved. 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 also fixedly connected with the annular support base 4, so that the annular support base 4 is better connected and fixed with the steel chimney.

[0023] The annular support base 4 is further provided with a plurality of vertical stiffening ribs 9 arranged in an annular array inside, which can improve the structural strength of the annular support base 4.

[0024] The vertical stiffening rib 9 is provided with two layers, which are arranged in the annular support base 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 surface of the vertical stiffening rib 9 is welded and fixed to the inner wall of the steel chimney. The double-layer vertical stiffening rib 9 can better improve the structural strength of the annular support base 4, and the vertical stiffening rib 9 is welded and fixed to the inner wall of the steel chimney, so that the annular support base 4 is firmly fixed and connected with the steel chimney.

[0025] The annular support base 4 is cast by refractory castable 10, so that the annular support base 4 has good refractory performance, the refractory castable 10 is internally 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 with the inner wall of the steel chimney, so as to ensure that the annular support base 4 and the steel chimney can be well fixed and connected together, and downward displacement of the annular support base 4 under the action of gravity is avoided.

[0026] During construction, taking a 60-80m high temperature steel chimney as an example, the cylinder wall of the steel chimney is divided into several sections during design, each section is about 5m, the radial ring stiffening rib 8 and the vertical stiffening rib 9 of each section of cylinder wall are directly welded on the inner cylinder wall of the steel chimney on the ground or in the factory, the first 1, 2 sections of steel chimney are hoisted and installed, the radial ring steel mesh 11 and the refractory castable 10 of the annular support base 4 are constructed after the first 1, 2 sections of steel chimney are installed, and finally the heat insulation layer 3 of the first 1, 2 sections of steel chimney is built after the annular support base 4 reaches the design strength, then the third section of steel chimney is hoisted and installed, the annular support base 4 between the second and third sections is constructed, then the heat insulation layer 3 of the third section of steel chimney is constructed, and so on.

Claims

1. A flexible supporting structure for a thermal insulation layer in a steel chimney, said steel chimney comprising an upper section steel chimney (1) and a lower section steel chimney (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 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), the middle line of the refractory fiber felt (6) is exactly 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; The annular support base (4) is further provided with a plurality of vertical stiffening ribs (9) arranged in an annular array; The top end of the annular support base (4) is provided with an upward protruding ring (7), the protruding 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 protruding ring (7) and the heat preservation layer (3); The vertical stiffening rib (9) is provided with two layers, above and below the joint plane of the upper steel chimney (1) and the lower steel chimney (2), in the annular support base (4), and the outer side surface of the vertical stiffening rib (9) is welded and fixed with the inner wall of the steel chimney.

2. A steel chimney inner thermal insulation layer elastic support structure 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 protruding ring (7) is greater than or equal to 200mm.

3. A steel chimney inner thermal insulation layer elastic support structure according to claim 1, characterized in that: 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), and the end of the radial ring steel mesh (11) is welded and fixed with the inner wall of the steel chimney.

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