Lining anti-corrosion structure of steel chimney

Abstract

The utility model provides a lining anti-corrosion structure of a steel chimney, which is applied to the technical field of steel chimneys and is characterized by comprising an inner cylinder, a connecting structure and a metal lining, the connecting structure is annularly arranged along the inner wall of the inner cylinder and fixedly connected with the inner cylinder, the metal lining is fixed on the connecting structure, and a heat preservation and insulation layer is arranged between the metal lining and the inner cylinder; the connecting structure comprises outer side connecting angle steel fixed on the inner wall of the inner cylinder, an inner side connecting angle steel frame fixed on the metal lining and a connecting piece for connecting the outer side connecting angle steel and the inner side connecting angle steel frame together; a waist-shaped hole for providing a sliding space for the connecting piece is formed in the outer side connecting angle steel frame or the inner side connecting angle steel frame; compared with the prior art, the anti-corrosion chimney has the technical effects that the anti-corrosion performance is ensured, the cost and the temperature stress of an anti-corrosion material are effectively reduced, the manufacturing process is mature, and the market competitiveness of the chimney product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel chimneys, in particular to an anti-corrosion structure for the inner lining of a steel chimney. Background Art

[0002] At present, the steel chimney structures on the market are mostly in the form of sleeves. The inner and outer cylinders are relatively independent structural systems (the outer cylinder bears the load and the inner cylinder discharges smoke), and the inner cylinder can freely expand and contract after being heated. The inner cylinder is a self-standing structure, and the selection of its wall thickness needs to meet the requirements of stiffness, strength and stability; for chimneys with a larger diameter, in order to ensure the mechanical requirements of the inner cylinder, generally a composite plate form (stainless steel composite plate, titanium composite plate) is selected, or a thicker corrosion-resistant metal material (stainless steel, titanium plate) is selected. However, the above two types of inner cylinder selections have high construction costs.

[0003] At present, the Chinese utility model with the publication number CN201649778U discloses an anti-corrosion device for the inner cylinder of a steel chimney, which includes a steel inner cylinder, keels, high-temperature acid-resistant foam boards and titanium plates; each keel is horizontally distributed in a circle along the circumference of the steel inner cylinder and is fixed to the steel inner cylinder, and a group of welded keels are arranged at intervals from bottom to top in the steel inner cylinder; a high-temperature acid-resistant foam layer is filled between the keels on the inner wall of the steel inner cylinder, and a cylindrical titanium plate is fixed on the inner side of the high-temperature acid-resistant foam layer, and the titanium plate is fixed on the keels.

[0004] In the existing anti-corrosion device for the inner cylinder of a steel chimney, the steel inner cylinder, the keels and the titanium plates are welded together. When the flue gas temperature is very high, the titanium plates cannot freely expand and contract, and large temperature stresses are generated at the welding points. Under the combined action of the temperature stresses and the residual welding stresses, there is a risk of cracking at the welds. Content of the Utility Model

[0005] The purpose of the utility model is to provide an anti-corrosion structure for the inner lining of a steel chimney, and its advantage is that while ensuring the anti-corrosion performance of the inner cylinder, the anti-corrosion temperature stress is effectively reduced, and further the risk of cracking at the welds is effectively reduced.

[0006] To achieve the above purpose and other related purposes, the utility model provides the following technical solutions:

[0007] An anti-corrosion structure for the inner lining of a steel chimney includes an inner cylinder, a connection structure arranged circumferentially along the inner wall of the inner cylinder and fixedly connected to the inner cylinder, and a metal inner lining fixed on the connection structure. A heat insulation layer is arranged between the metal inner lining and the inner cylinder;

[0008] The connection structure includes an outer connection angle steel fixed on the inner wall of the inner cylinder, an inner connection angle steel frame fixed on the metal inner lining, and a connecting piece connecting the outer connection angle steel and the inner connection angle steel frame;

[0009] A kidney-shaped hole for providing a sliding space for the connecting piece is opened on the outer connection angle steel or the inner connection angle steel frame.

[0010] Through the above technical solution, the metal inner lining is a corrosion-resistant metal plate, which is used to protect the inner cylinder so as to prevent the corrosion of the inner cylinder by the flue gas and improve the service life of the steel chimney; the outer connecting angle steel is fixedly connected to the inner wall of the inner cylinder, and the inner connecting angle steel frame is fixedly connected to the metal inner lining. The connecting piece is used to connect the outer connecting angle steel and the inner connecting angle steel frame so as to connect the metal inner lining and the inner cylinder together; when the temperature of the flue gas is very high, the metal inner lining will deform due to heat; a kidney-shaped hole for providing a sliding space for the connecting piece is opened on the outer connecting angle steel or the inner connecting angle steel frame, so that the connecting piece can move relatively in the kidney-shaped hole, thereby releasing the temperature stress of the metal plate and effectively reducing the risk of cracking at the weld.

[0011] In an embodiment of the present invention, the outer connecting angle steel includes an outer horizontal plate and an outer supporting back plate that is perpendicular to the outer horizontal plate and integrally formed with the outer horizontal plate;

[0012] One end of the outer horizontal plate is fixed on the inner wall of the inner cylinder;

[0013] The kidney-shaped hole is vertically opened on the outer supporting back plate.

[0014] In an embodiment of the present invention, the inner connecting angle steel frame includes an inner supporting back plate, an inner horizontal plate that is perpendicular to the inner supporting back plate and integrally formed with the inner supporting back plate, and a lining connecting plate that is perpendicular to the inner horizontal plate and fixedly connected to the inner horizontal plate;

[0015] The inner supporting back plate is arranged on the side close to the outer supporting back plate, and a connecting hole is opened on the inner supporting back plate;

[0016] The lining connecting plate is fixed on the metal inner lining.

[0017] In an embodiment of the present invention, the connecting piece includes a connecting bolt inserted into the connecting hole and the kidney-shaped hole and a connecting nut threadedly connected to the connecting bolt.

[0018] Through the above technical solution, the outer horizontal plate is used to be fixed together with the inner cylinder, and the lining connecting plate is used to be fixed together with the metal inner lining; the inner supporting back plate and the outer supporting back plate are attached together and connected together by the connecting bolt and the connecting nut, so that the inner cylinder and the metal inner lining are connected together.

[0019] In an embodiment of the present invention, a pin shaft is inserted on the connecting bolt close to the connecting nut side.

[0020] Through the above technical solution, the pin shaft is used to limit the connecting nut on the bolt, so as to prevent the connecting bolt from loosening.

[0021] In an embodiment of the present invention, the metal inner lining is a titanium plate.

[0022] In an embodiment of the present utility model, the inner lining connecting plate is a titanium composite plate; on one side of the titanium layer in the titanium composite plate faces the metal inner lining, and on the side of the carbon steel layer faces the inner cross plate.

[0023] Through the above technical solution, the metal inner lining is a titanium plate, and the inner lining connecting plate is a titanium composite plate. Both the titanium plate and the titanium composite plate have good corrosion resistance; on one side of the titanium layer in the titanium composite plate faces the metal inner lining, and on the side of the carbon steel layer faces the inner cross plate; it is convenient for the inner lining connecting plate to be more firmly welded and fixed together with the metal inner lining and the inner cross plate.

[0024] In an embodiment of the present utility model, it includes several sections of metal inner linings, and adjacent two sections of the metal inner linings are butt-jointed up and down and then welded and fixed on the inner lining connecting plate.

[0025] Through the above technical solution, adjacent two sections of metal inner linings are butt-jointed up and down and then welded and fixed on the inner lining connecting plate, so as to facilitate sealing, avoid the contact between the flue gas and the inner wall of the inner cylinder, prevent the corrosion of the inner cylinder by the flue gas, and improve the service life of the steel chimney.

[0026] In an embodiment of the present utility model, a cavity is formed between the inner cylinder and the metal inner lining, and the thermal insulation layer is the thermal insulation cotton stuffed in the cavity.

[0027] Through the above technical solution, the thermal insulation cotton is used for thermal insulation, so that the temperature of the inner and outer walls of the inner cylinder is reduced to a certain value, meeting the use requirements of the specification for the outer wall temperature.

[0028] As described above, the inner lining anti-corrosion structure of a steel chimney of the present utility model has the following beneficial effects:

[0029] 1. The metal inner lining is a corrosion-resistant metal plate, and the metal inner lining is used to protect the inner cylinder so as to prevent the corrosion of the inner cylinder by the flue gas, and improve the service life of the steel chimney;

[0030] 2. The outer connecting angle steel is fixedly connected to the inner wall of the inner cylinder, and the inner connecting angle steel frame is fixedly connected to the metal inner lining. The connecting piece is used to connect the outer connecting angle steel and the inner connecting angle steel frame so as to connect the metal inner lining and the inner cylinder together; when the flue gas temperature is very high, since the metal inner lining will deform when heated; waist-shaped holes for providing a sliding space for the connecting piece are opened on the connection of the outer connecting angle steel or the inner connecting angle steel frame, so that the connecting piece can move relatively in the waist-shaped holes, thereby releasing the temperature stress of the metal plate and effectively reducing the risk of cracking at the weld;

[0031] 3. While ensuring the anti-corrosion performance, the cost of the anti-corrosion material and the temperature stress are effectively reduced, the manufacturing process is mature, and the market competitiveness of this chimney product is improved. Description of the Drawings

[0032] Figure 1It is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0033] Figure 2 It is a schematic diagram of a partial structure of an embodiment of the present utility model;

[0034] Figure 3 It is Figure 2 An enlarged schematic diagram of part A in

[0035] Reference numerals: 1, inner cylinder; 2, connection structure; 3, metal inner lining; 4, thermal insulation layer; 21, outer connecting angle steel; 22, inner connecting angle steel frame; 23, connecting piece; 8, kidney-shaped hole; 211, outer horizontal plate; 212, outer supporting back plate; 221, inner supporting back plate; 222, inner horizontal plate; 223, inner lining connecting plate; 231, connecting bolt; 232, connecting nut; 16, pin shaft. Specific embodiments

[0036] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0037] Please refer to Figures 1 to 3 . It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model. Therefore, they do not have any technical substance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope for the implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope for the implementation of the present utility model.

[0038] Please refer to Figure 1 , Figure 2 and Figure 3 , the present utility model provides an anti-corrosion structure for the inner lining of a steel chimney, including an inner cylinder 1, a connection structure 2, a metal inner lining 3, and a thermal insulation layer 4;

[0039] The connecting structure 2 is a ring structure, which is arranged circumferentially along the inner wall of the inner cylinder 1 and fixedly connected to the inner cylinder 1; the metal inner liner 3 is a cylindrical structure, which is located inside the inner cylinder 1 and fixed on the connecting structure 2; wherein a plurality of connecting structures 2 are fixedly arranged axially along the inner wall of the inner cylinder 1; the connecting structure 2 includes an outer connecting angle steel 21 fixed on the inner wall of the inner cylinder 1, an inner connecting angle steel frame 22 fixed on the metal inner liner 3, and a connecting piece 23 connecting the outer connecting angle steel 21 and the inner connecting angle steel frame 22; both the outer connecting angle steel 21 and the inner connecting angle steel frame 22 are ring structures; a kidney-shaped hole 8 providing a sliding space for the connecting piece 23 is formed on the outer connecting angle steel 21 or the inner connecting angle steel frame 22. In this embodiment, it is preferably formed on the outer connecting angle steel 21.

[0040] The outer connecting angle steel 21 includes an outer horizontal plate 211 and an outer supporting back plate 212 which is perpendicular to the outer horizontal plate 211 and integrally formed with the outer horizontal plate 211; one end of the outer horizontal plate 211 is welded and fixed on the inner wall of the inner cylinder 1, and a plurality of kidney-shaped holes 8 are vertically formed at equal intervals on the outer supporting back plate 212.

[0041] The inner connecting angle steel frame 22 includes an inner supporting back plate 221, an inner horizontal plate 222 which is perpendicular to the inner supporting back plate 221 and integrally formed with the inner supporting back plate 221, and a lining connecting plate 223 which is perpendicular to the inner horizontal plate 222; one end of the inner horizontal plate 222 is welded and fixed to the lining connecting plate 223; the inner supporting back plate 221 is arranged close to the outer supporting back plate 212, and a plurality of connecting holes corresponding to the kidney-shaped holes 8 one by one are formed on the inner supporting back plate 221; the lining connecting plate 223 is welded and fixed on the metal inner liner 3.

[0042] The connecting piece 23 includes a connecting bolt 231 inserted into the connecting hole and the kidney-shaped hole 8 and a connecting nut 232 threadedly connected to the connecting bolt 231; the inner supporting back plate 221 and the outer supporting back plate 212 are attached together and connected by the connecting bolt 231 and the connecting nut, so that the inner cylinder 1 and the metal inner liner 3 are connected together; a pin shaft 16 is inserted into the connecting bolt 231 on the side close to the connecting nut 232; the pin shaft 16 is used to limit the connecting nut on the bolt, so as to prevent the connecting bolt 231 from loosening.

[0043] Please refer to Figure 1 、 Figure 2 and Figure 3 , in this embodiment, it includes several sections of metal inner liners 3. After adjacent two sections of metal inner liners 3 are butted up and down and then welded and fixed on the lining connecting plate 223; it is convenient to achieve sealing, avoid the contact between the flue gas and the inner wall of the inner cylinder 1, prevent the corrosion of the inner cylinder 1 by the flue gas, and improve the service life of the steel chimney; a cavity is formed between the inner cylinder 1 and the metal inner liner 3, and the heat insulation layer 4 is heat-insulating cotton stuffed in the cavity; the heat-insulating cotton is used to achieve heat insulation.

[0044] In this embodiment, the metal inner lining 3 is a titanium plate, and the inner lining connecting plate 223 is a titanium composite plate; both the titanium plate and the titanium composite plate have good corrosion resistance; on the titanium composite plate, the titanium layer faces the metal inner lining 3 and is welded and fixed to the metal inner lining 3, and the carbon steel layer faces the inner horizontal plate 222 and is welded and fixed to the inner horizontal plate 222; this facilitates the more firm welding and fixing of the inner lining connecting plate 223 to the metal inner lining 3 and the inner horizontal plate 222.

[0045] Working principle (usage method):

[0046] (1) The outer connecting angle steel 21 is welded to the inner side of the cylinder wall; the horizontal spacing of the outer connecting angle steel 21 is selected according to the purchased plate width of the metal inner lining 3;

[0047] (2) The inner connecting angle steel frame 22 is connected to the outer connecting angle steel 21 through the connecting bolt 231. Among them, no pre-tightening force is applied to the connecting bolt 231, that is, the connecting nut and the bolt head are just in contact with the supporting backs of the inner connecting angle steel frame 22 and the outer connecting angle steel 21; the pin shaft 16 inserted at the end of the connecting bolt 231 is used to prevent the connecting bolt 231 from loosening;

[0048] A waist-shaped hole 8 is opened on the outer supporting back plate 212 of the outer connecting angle steel 21. The length of the waist-shaped hole 8 is greater than the temperature displacement at this place, and it can freely expand and contract under the action of temperature to release the temperature stress at this place; during initial installation, under the action of its own weight, the connecting bolt 231 is located at the lowest position of the waist-shaped hole 8;

[0049] (3) The end of the inner lining connecting plate 223 is penetration-welded to the inner horizontal plate 222; if the metal inner lining 3 is made of titanium, the inner lining connecting plate 223 needs to select a titanium composite plate, with the titanium layer facing the metal inner lining 3 and the carbon steel layer facing the inner horizontal plate 222; if the metal inner lining 3 is made of stainless steel, the inner lining connecting plate 223 selects stainless steel of the same material as the metal inner lining 3;

[0050] (4) The heat insulation cotton is filled in the cavity formed by the inner cylinder 1 and the metal inner lining 3;

[0051] (5) According to the flue gas composition, select the corresponding anti-corrosion metal inner lining 3. The metal inner linings 3 on the upper side and the lower side are circumferentially butt-welded on the inner lining connecting plate 223, and the weld seams are arranged as close as possible to the middle position of the inner lining connecting plate 223. The upper and lower metal inner linings 3 and the inner lining connecting plate 223 are fixedly connected together through the circumferential weld seams;

[0052] Among them, if there is too large a gap at the splicing place of the metal inner lining 3 during actual splicing due to manufacturing deviation, the same material can be used for repair welding at the splicing place.

[0053] In summary, the metal lining 3 in the present utility model is a corrosion-resistant metal plate. The metal lining 3 is used to protect the inner cylinder 1 so as to prevent the corrosion of the inner cylinder 1 by the flue gas and improve the service life of the steel chimney. When the temperature of the flue gas is very high, the metal lining 3 will deform due to heat. The waist-shaped holes 8 providing a sliding space for the connecting member 23 are formed in the outer connecting angle steel 21 or the inner connecting angle steel frame 22, so that the connecting member 23 can move relatively within the waist-shaped holes 8, thereby releasing the temperature stress of the metal plate and effectively reducing the risk of cracking at the weld. Therefore, the present utility model effectively overcomes various drawbacks in the prior art and has high industrial utilization value.

[0054] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not used to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. An anti-corrosion structure for the inner lining of a steel chimney, characterized in that, It includes an inner cylinder (1), a connecting structure (2) circumferentially arranged along the inner wall of the inner cylinder (1) and fixedly connected to the inner cylinder (1), and a metal lining (3) fixed on the connecting structure (2). A thermal insulation layer (4) is provided between the metal lining (3) and the inner cylinder (1). The connecting structure (2) includes an outer connecting angle steel (21) fixed on the inner wall of the inner cylinder (1), an inner connecting angle steel frame (22) fixed on the metal lining (3), and a connecting piece (23) connecting the outer connecting angle steel (21) and the inner connecting angle steel frame (22). A kidney-shaped hole (8) providing a sliding space for the connecting piece (23) is formed on the outer connecting angle steel (21) or the inner connecting angle steel frame (22).

2. The anti-corrosion structure of the inner lining of a steel chimney according to claim 1, characterized in that: The outer connecting angle steel (21) includes an outer horizontal plate (211) and an outer supporting back plate (212) perpendicular to the outer horizontal plate (211) and integrally formed with the outer horizontal plate (211). One end of the outer horizontal plate (211) is fixed on the inner wall of the inner cylinder (1). The kidney-shaped hole (8) is vertically formed on the outer supporting back plate (212).

3. The anti-corrosion structure for the inner lining of a steel chimney according to claim 2, characterized in that: The inner connecting angle steel frame (22) includes an inner supporting back plate (221), an inner horizontal plate (222) perpendicular to the inner supporting back plate (221) and integrally formed with the inner supporting back plate (221), and a lining connecting plate (223) perpendicular to the inner horizontal plate (222) and fixedly connected to the inner horizontal plate (222). The inner supporting back plate (221) is arranged on the side close to the outer supporting back plate (212), and a connecting hole is formed on the inner supporting back plate (221). The lining connecting plate (223) is fixed on the metal lining (3).

4. The anti-corrosion structure of the inner lining of a steel chimney according to claim 3, characterized in that: The connecting piece (23) includes a connecting bolt (231) inserted into the connecting hole and the kidney-shaped hole (8), and a connecting nut (232) threadedly connected to the connecting bolt (231).

5. The anti-corrosion structure of the inner lining of a steel chimney according to claim 4, characterized in that: A pin shaft (16) is inserted on the connecting bolt (231) on the side close to the connecting nut (232).

6. The anti-corrosion structure of the inner lining of a steel chimney according to claim 5, characterized in that: The metal lining (3) is a titanium plate.

7. The anti-corrosion structure of the inner lining of a steel chimney according to claim 6, characterized in that: The lining connecting plate (223) is a titanium composite plate; the titanium layer side of the titanium composite plate faces the metal lining (3), and the carbon steel layer side faces the inner horizontal plate (222).

8. The anti-corrosion structure of the inner lining of a steel chimney according to claim 7, characterized in that: It includes several sections of metal linings (3). After adjacent two sections of the metal linings (3) are vertically butted, they are welded and fixed on the lining connecting plate (223).

9. The anti-corrosion structure of the inner lining of a steel chimney according to claim 1, characterized in that: A cavity is formed between the inner cylinder (1) and the metal lining (3), and the thermal insulation layer (4) is heat insulation cotton stuffed in the cavity.

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