Air pre-heater pipe orifice protection structure

Abstract

The utility model provides an air pre-heater pipe orifice protection structure which comprises a protection pipe inserted into a working pipe, the protection pipe comprises an internally-installed section inserted into the working pipe and an outwards-extending section exposed out of the working pipe, the inner diameter of the outwards-extending section is the same as that of the internally-installed section, a limiting part is arranged between the outwards-extending section and the internally-installed section, and the outer diameter of the limiting part is larger than the inner diameter of the working pipe. The outer end face of the outward extending section is of an arc-shaped structure. A plurality of functional grooves are formed in the outer circumferential face of the built-in section in the axis direction of the protection pipe. The protection device is reasonable in structural design, the protection pipe is installed at the pipe opening of the air pre-heater working pipe, the limiting part abuts against the tail end of the pipe opening, the outwards-extending section of the protection pipe serves as outer end protection of the pipe opening of the working pipe, the internally-installed section serves as protection of the inner side of the pipe opening of the working pipe, the pipe opening can be effectively prevented from being corroded and damaged, and the service life of the air pre-heater working pipe is prolonged. And the service life of the working pipe is prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of air preheater equipment, and particularly relates to an air preheater pipe opening protection structure. BACKGROUND

[0002] The air preheater is one of important auxiliary equipment of the thermal power plant, which uses the waste heat in the flue gas to heat the air required in the combustion in the boiler. The heat exchange equipment can not only recover the waste heat and reduce the flue gas temperature, but also promote the drying, ignition and combustion process of the fuel, ensure the stable combustion in the boiler and improve the combustion efficiency. The tubular air preheater is a common type of air preheater in the thermal power plant, but with the increasing environmental protection pressure, the tubular air preheater often has the damage at the position of 200 mm from the pipe opening due to the low temperature corrosion, which causes the leakage phenomenon, reduces the boiler efficiency and affects the boiler output. Therefore, it is necessary to protect the pipe opening of the existing air preheater tube bundle. SUMMARY

[0003] Therefore, the application aims to overcome the defects in the prior art and provide an air preheater pipe opening protection structure.

[0004] To achieve the above-mentioned purpose, the technical scheme of the application is as follows:

[0005] An air preheater pipe opening protection structure comprises a protection pipe inserted into a working pipe, the protection pipe comprises an inner mounting section inserted into the working pipe and an outer extension section exposed to the working pipe, the outer extension section has the same inner diameter as the inner mounting section, a limiting part is arranged between the outer extension section and the inner mounting section, the limiting part has an outer diameter larger than the inner diameter of the working pipe, and the outer end surface of the outer extension section has an arc structure; a plurality of functional grooves are arranged on the outer circumferential surface of the inner mounting section along the axial direction of the protection pipe.

[0006] Further, the outer diameter of the limiting part is the same as the diameter of the working pipe.

[0007] Further, the functional grooves are uniformly arranged around the axial line of the protection pipe.

[0008] Further, 5-8 functional grooves are uniformly arranged along the outer circumferential direction of the protection pipe.

[0009] Further, the length of the outer extension section exposed to the working pipe is 2-3 cm.

[0010] Further, the length of the limiting part along the axial direction of the protection pipe accounts for 1 / 3-1 / 2 of the total length of the outer extension section.

[0011] Further, the outer circumferential surface of the limiting part has an arc surface structure.

[0012] Further, the end of the inner mounting section is provided with a conical guide structure.

[0013] Compared with the prior art, the application has the following advantages:

[0014] The application has a reasonable structure design. By installing the protection pipe at the pipe opening of the air preheater working pipe, the limiting part is abutted against the end of the pipe opening, the outer extension section of the protection pipe is used as the outer end protection of the pipe opening of the working pipe, and the inner installation section is used as the protection of the inner side of the pipe opening of the working pipe, so that the corrosion and damage of the pipe opening position can be effectively avoided, and the service life of the working pipe is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application and are incorporated herein for purposes of illustration. The embodiments of the present application, as well as the specification, are exemplary and explanatory, and they are not restrictive of the present application. In the drawings:

[0016] Figure 1 A structural schematic diagram of the application;

[0017] Figure 2 A sectional view of the application;

[0018] Figure 3 A schematic diagram when the functional groove in the application is a through groove structure;

[0019] Figure 4 A schematic diagram when the application is applied;

[0020] Figure 5 A schematic diagram when the application is provided with a groove;

[0021] Figure 6 A sectional view of Figure 5 ;

[0022] Figure 7 A structural schematic diagram of the groove part in Figure 6 ; DETAILED DESCRIPTION

[0023] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0024] In the description of the present application, it is to be understood by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and not indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation of the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0025] In the description of the present application, it is to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0026] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0027] A kind of air preheater pipe mouth protection structure, as shown in Figures 1 to 7 The protection pipe 1 is inserted into the working pipe, which includes the inner segment 2 inserted into the working pipe and the outer segment 3 exposed to the working pipe, the outer diameter of the limiting part 4 between the outer segment and the inner segment is greater than the inner diameter of the working pipe, and the outer end face of the outer segment is arc structure 5. In order to facilitate the insertion of the inner segment into the working pipe, the tapered guide structure 8 is provided at the end of the inner segment, so that the air flow can smoothly enter the working pipe.

[0028] The outer end of the outer segment at the pipe mouth position is arc structure end face, which reduces the corrosion at the edge position of the outer end of the outer segment during the working of the air preheater. The outer circumference of the limiting part is preferably arc surface structure 7, which can reduce the corrosion at the edge position of the limiting part. A plurality of functional grooves 6 are arranged on the outer circumference of the inner segment along the axis direction of the protection pipe. As an example, the protection pipe is made of polytetrafluoroethylene pipe with rubber material, which has higher density, smoother surface, better physical and chemical properties, and higher hardness. Therefore, the protection pipe can provide good protection for the pipe mouth of the air preheater.

[0029] The protective tube can be fixed to the working tube by gluing, and the specific operation is as follows: in use, only the inner wall of the inner section is coated with glue, and then the inner section is inserted into the working tube, and the limiting portion is used to limit, and when the end of the working tube contacts the limiting portion, the installation of the protective tube is completed.

[0030] In an optional embodiment, each functional groove is a through groove structure penetrating the side wall of the inner section. In such a design, the inner section can be inserted into the working tube first, and then the functional groove is glued on the inner side of the inner section. Of course, even if the functional groove is a structure penetrating the side wall of the inner section, the operation mode of gluing the outer wall of the inner section first and then inserting the inner section into the working tube can be adopted for the installation of the protective tube. The construction scheme can be selected according to actual needs. As an example, the glue applied on the inner section is 587 silicone rubber sealant, which has good temperature resistance (suitable for low-temperature section of air preheater), and is resistant to acid and alkali corrosion (acid corrosion in the low-temperature section of the air preheater), which can ensure the tightness between the protective tube and the working tube.

[0031] The outer diameter of the limiting portion is the same as the diameter of the working tube. The limiting portion not only serves as positioning during installation of the protective tube, but also serves as protection for the outer end surface of the working tube by abutting the end of the working tube against the limiting portion, thereby avoiding corrosion and damage to the outer end surface of the working tube. Each functional groove is uniformly distributed around the axis of the protective tube. Five to eight functional grooves are uniformly distributed along the outer circumference of the protective tube. The length of the outer extension section that protrudes out of the working tube is 2-3 cm. Generally, the length of the limiting portion along the axial direction of the protective tube accounts for 1 / 3-1 / 2 of the total length of the outer extension section.

[0032] In an optional embodiment, due to working condition restrictions, if the length of the protective tube is limited, a groove 9 can be provided at the junction of the inner section and the limiting portion of the outer extension section. The groove has an inner recess 10 extending to the root of the limiting portion. After the outer wall of the inner section is coated with glue, the inner section is inserted into the working section, and part of the glue is pressed into the groove. Since the groove has an inner recess that connects to the limiting portion, the stability of the glue fixing of the protective tube and the working tube is improved, and the connection reliability between the protective tube and the working tube can be better guaranteed in the case of limited length of the protective tube.

[0033] The structure of the present application is reasonable. By installing the protective tube at the opening of the working tube of the air preheater, the corrosion resistance and high temperature resistance of the opening position can be improved, and the structural strength of the opening position of the working tube is higher. Moreover, the limiting portion abuts against the end of the opening, and the outer extension section of the protective tube serves as the outer end protection of the opening of the working tube, and the inner section serves as the protection of the inner side of the opening of the working tube, which can effectively prevent corrosion and damage at the opening position, and prolong the service life of the working tube.

[0034] The above merely describes preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An air preheater nozzle protection structure, characterized in that: The protective tube is inserted into the inner section of the working tube and extends out of the working tube, the outer section has the same inner diameter as the inner section, a limiting section is arranged between the outer section and the inner section, the outer diameter of the limiting section is larger than the inner diameter of the working tube, and the outer end surface of the outer section is arc-shaped.

2. The air preheater nozzle guard structure of claim 1, wherein: The outer diameter of the limiting section is the same as the diameter of the working tube.

3. The air preheater nozzle guard structure of claim 1, wherein: Each of the functional grooves is arranged uniformly around the axis of the protective tube.

4. The air preheater nozzle guard structure of claim 1, wherein: 5-8 functional grooves are arranged uniformly along the outer circumferential direction of the protective tube.

5. The air preheater nozzle guard structure of claim 1, wherein: The length of the outer section extending out of the working tube is 2-3 cm.

6. A structure for protecting the nozzles of an air preheater according to claim 4, characterized in that: The length of the limiting section along the axial direction of the protective tube accounts for 1 / 3-1 / 2 of the total length of the outer section.

7. The air preheater nozzle guard structure of claim 1, wherein: The outer circumferential surface of the limiting section is arc-shaped.

8. The air preheater nozzle guard structure of claim 1, wherein: A conical guide structure is arranged at the end of the inner section.

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