Explosion-proof pipe low-temperature superheater

Abstract

The utility model discloses an explosion-proof pipe low-temperature superheater which comprises a serpentine pipe assembly, one end of the serpentine pipe assembly is communicated with a water inlet header, the other end of the serpentine pipe assembly is communicated with a water outlet header, the serpentine pipe assembly comprises three groups of serpentine pipe pieces which are arranged up and down and communicated with one another, and C22 is cladded on the serpentine pipe pieces on the middle layer and the lowest layer; according to the utility model, by increasing the wall thickness and cladding the C22 material outside the coiled pipe, the reliability and stability of the operation of the boiler are improved, the fault rate of the operation of the boiler is reduced, the blowing-out frequency of the boiler is reduced, and the energy utilization rate is improved; the three sets of S-shaped pipe pieces are arranged up and down, and the S-shaped pipe piece on the lowermost side is formed by winding two mutually attached S-shaped pipes, so that resources are saved, and the efficiency of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-temperature superheaters, in particular to an explosion-proof tube low-temperature superheater. Background Art

[0002] A boiler is an energy conversion device, and a low-temperature superheater is a component in a boiler used to recover waste heat from boiler flue gas.

[0003] In solid waste incineration boilers, the flue gas temperature in the medium-temperature section of the low-temperature superheater is around 700°C. The fly ash produced by boiler combustion has a high viscosity and is easily attached to the serpentine tubes of the low-temperature superheater, which reduces the heat transfer efficiency. The current material of the medium-temperature section serpentine tubes is 12Cr1MoVG. The fly ash attached to them can easily cause the serpentine tubes to corrode and cause tube burst accidents, so improvements are needed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention provides an explosion-proof tube low-temperature superheater to solve the problems mentioned in the above background technology.

[0005] The utility model provides the following technical solution: an explosion-proof tube low-temperature superheater, comprising a serpentine tube assembly, one end of the serpentine tube assembly is connected to a water inlet header, and the other end is connected to a water outlet header, the serpentine tube assembly comprises three groups of serpentine tube segments arranged vertically and interconnected, the middle layer and the bottom layer of the serpentine tube segments are clad with C22;

[0006] The two groups of serpentine tube segments on the upper side are formed by winding a serpentine tube, and the serpentine tube segment on the lower side is formed by winding two serpentine tubes that fit together.

[0007] Preferably, the upper side surface of the serpentine tube in the uppermost layer and the lower side surface of the serpentine tube in the lowermost layer in each serpentine tube segment are respectively covered with anti-wear cover plates.

[0008] Preferably, the anti-wear cover plate extends up and down to the bending point of the serpentine tube, and the upper and lower widths of the anti-wear cover plate are half of the outer diameter of the serpentine tube.

[0009] Preferably, each of the anti-wear cover plates is spliced ​​together by three anti-wear cover plate assemblies on the left and right. The left end of the anti-wear cover plate assembly is tilted upward and then extended to the left to cover the adjacent anti-wear cover plate assembly, and the anti-wear cover plate assembly is clamped to the outside of the serpentine tube by a splint.

[0010] Preferably, the serpentine tubes in each of the serpentine tube segments are provided with vertically arranged tube clamps, and the tube clamps are arranged in three rows arranged left and right.

[0011] Preferably, it further comprises a fixing block, which is fixed to the lower edge of the bend of the outer curved surface of the serpentine tube, and a plurality of the fixing blocks provided in a group of the serpentine tube segments are arranged left to right and staggered up and down.

[0012] Preferably, the serpentine segments of the uppermost layer are made of 20G steel, the serpentine segments of the middle layer are made of 12Cr1MoVG alloy tubes, the serpentine segments of the lowermost layer are made of SA213-TP347H steel, and the wear-resistant cover plates are made of 310S steel.

[0013] Preferably, the serpentine tube wall thickness in the serpentine tube segments in the bottom and middle layers is not less than 4 mm, and the serpentine tube wall thickness in the serpentine tube segments in the top layer is not less than 4.5 mm.

[0014] The utility model provides an explosion-proof tube low-temperature superheater, which has the following beneficial effects:

[0015] The utility model improves the reliability and stability of boiler operation, reduces the failure rate of boiler operation, reduces the number of boiler shutdowns, and improves energy utilization by increasing the wall thickness and cladding C22 material on the outside of the serpentine tube;

[0016] The utility model is provided with three groups of upper and lower serpentine tube segments, and the lowermost serpentine tube segment is formed by winding two serpentine tubes that fit together, thereby saving resources and improving the efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a main schematic diagram of the utility model;

[0018] Figure 2 yes Figure 1 An enlarged schematic diagram of the lowest layer of serpentine segments;

[0019] Figure 3 yes Figure 2 Enlarged schematic diagram of point A in the middle.

[0020] In the picture:

[0021] 11. Serpentine tube assembly; 12. Serpentine tube segment; 13. Serpentine tube; 14. Cover plate; 15. Anti-wear cover plate assembly; 16. Pipe clamp; 17. Fixing block. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0026] Reference Figure 1-Figure 3 According to an embodiment of an explosion-proof tube low-temperature superheater of the present invention, it includes a serpentine tube assembly 11 fixed in the rear vertical shaft flue, one end of the serpentine tube assembly 11 is connected to the water inlet header, and the other end is connected to the water outlet header. In this embodiment, the serpentine tube assembly 11 is configured as a three-section type, which includes three groups of serpentine tube segments 12 arranged up and down and connected to each other. The two groups of serpentine tube segments 12 on the upper side are formed by winding a serpentine tube 13, and the serpentine tube segment 12 on the lower side is formed by winding two serpentine tubes 13 close to each other.

[0027] In order to avoid tube bursts, improve the reliability and stability of boiler operation, reduce the failure rate of boiler operation, and reduce the number of boiler shutdowns, C22 is clad on the middle layer and the bottom layer of the serpentine tube segments 12 to form a C22 Hastelloy alloy cladding layer on the surface of the serpentine tube 13. The C22 material has strong corrosion resistance, wear resistance, and high temperature resistance, which improves the operating time of the low-temperature superheater.

[0028] In addition, in order to improve the anti-wear effect, the upper side surface of the serpentine tube 13 in the top layer of each serpentine tube segment 12 and the lower side surface of the serpentine tube 13 in the bottom layer are respectively covered with an anti-wear cover plate 14. In order to improve the coverage range of the anti-wear cover plate 14, the anti-wear cover plate 14 extends up and down to the bending point of the serpentine tube 13, and the upper and lower widths of the anti-wear cover plate 14 are half of the outer diameter of the serpentine tube 13.

[0029] In addition, in order to facilitate the installation of the anti-wear cover plate 14, each of the anti-wear cover plate 14 is spliced ​​together by three anti-wear cover plate assemblies 15 on the left and right. The left end of the anti-wear cover plate assembly 15 is tilted upward and then extended to the left to cover the adjacent anti-wear cover plate assembly 15, and the anti-wear cover plate assembly 15 is clamped to the outside of the serpentine tube 13 by a splint.

[0030] In order to improve the connection strength and structural rigidity of the serpentine tube 13, a vertically arranged tube clamp 16 is installed on the serpentine tube 13 in each serpentine tube segment 12. The tube clamp 16 is arranged in three rows arranged on the left and right.

[0031] In addition, it also includes a fixing block 17 for fixing the serpentine tube assembly 11 on the wall of the rear vertical shaft flue. The fixing block 17 is fixed to the lower edge of the bending part of the outer curved surface of the serpentine tube 13. The multiple fixing blocks 17 arranged in a group of the serpentine tube segments 12 are arranged left and right and staggered up and down.

[0032] In this embodiment, the serpentine tube segment 12 of the top layer is 20G steel, the serpentine tube segment 12 of the middle layer is 12Cr1MoVG alloy tube, the serpentine tube segment 12 of the bottom layer is SA213-TP347H steel, and the anti-wear cover plate 14 is improved from the original 304 material to 310S steel to further enhance the anti-wear effect.

[0033] In addition, the wall thickness of the serpentine tube 13 in the serpentine tube segment 12 of the bottom and middle layers is not less than 4 mm, which is 4 mm in this embodiment, and the wall thickness of the serpentine tube 13 in the top layer of the serpentine tube segment 12 is not less than 4.5 mm, which is 4.5 mm in this embodiment, to further avoid the occurrence of tube bursts.

[0034] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the scope of the present invention are included in the patent scope of the present invention.

Claims

1. An explosion-proof tube low-temperature superheater, comprising a serpentine tube assembly (11), one end of the serpentine tube assembly (11) being connected to a water inlet header, and the other end being connected to a water outlet header, characterized in that: The serpentine tube assembly (11) comprises three groups of serpentine tube segments (12) arranged vertically and interconnected, and the middle layer and the bottom layer of the serpentine tube segments (12) are clad with C22; The two groups of serpentine tube segments (12) located on the upper side are formed by winding a serpentine tube (13), and the serpentine tube segment (12) on the lower side is formed by winding two serpentine tubes (13) that fit together.

2. The explosion-proof tube low-temperature superheater according to claim 1, characterized in that: The upper side surface of the uppermost layer of the serpentine tube (13) in each of the serpentine tube segments (12) and the lower side surface of the lowermost layer of the serpentine tube (13) are respectively covered with a wear-resistant cover plate (14).

3. The explosion-proof tube low-temperature superheater according to claim 2, characterized in that: The anti-wear cover plate (14) extends up and down to the bending point of the serpentine tube (13), and the upper and lower widths of the anti-wear cover plate (14) are half of the outer diameter of the serpentine tube (13).

4. The explosion-proof tube low-temperature superheater according to claim 3, characterized in that: Each of the anti-wear cover plates (14) is formed by splicing three left and right anti-wear cover plate assemblies (15), the left end of the anti-wear cover plate assembly (15) is tilted upward and then extends to the left to cover the outside of the adjacent anti-wear cover plate assembly (15), and the anti-wear cover plate assembly (15) is clamped to the outside of the serpentine tube (13) through a clamping plate.

5. The explosion-proof tube low-temperature superheater according to claim 1, characterized in that: The serpentine tube (13) in each serpentine tube segment (12) is provided with a vertically arranged tube clamp (16), and the tube clamp (16) is provided in three rows arranged left and right.

6. The explosion-proof tube low-temperature superheater according to claim 1, characterized in that: It also includes a fixing block (17), which is fixed to the lower edge of the bend of the outer curved surface of the serpentine tube (13). A plurality of the fixing blocks (17) provided in a group of the serpentine tube segments (12) are arranged left and right and staggered up and down.

7. The explosion-proof tube low-temperature superheater according to claim 4, characterized in that: The serpentine segments (12) of the uppermost layer are made of 20G steel, the serpentine segments (12) of the middle layer are made of 12Cr1MoVG alloy tubes, the serpentine segments (12) of the lowermost layer are made of SA213-TP347H steel, and the anti-wear cover plate (14) is made of 310S steel.

8. The explosion-proof tube low-temperature superheater according to claim 7, characterized in that: The wall thickness of the serpentine tube (13) in the serpentine tube segments (12) in the bottom and middle layers is not less than 4 mm, and the wall thickness of the serpentine tube (13) in the serpentine tube segments (12) in the top layer is not less than 4.5 mm.

Images