Long-service-life anti-abrasion low-stress guiding and limiting device for heating surface of boiler

Abstract

The utility model relates to the technical field of boiler heating surface pipes, in particular to a boiler heating surface long-life abrasion-proof low-stress guide limiting device which comprises a plurality of sets of heating surface pipes, installation bases and sliding pairs, the installation bases are arranged on the outer surfaces of the multiple sets of heating surface pipes, and the sliding pairs are arranged on the installation bases. And connecting bases are arranged on the outer surfaces of the heating surface pipes correspondingly, the connecting bases and the mounting bases are symmetrically arranged, and sliding pairs are fixedly connected to the surfaces of one sides of the connecting bases correspondingly. The heating surface pipe, the mounting seat, the guide sliding groove, the sliding pair and the connecting seat are mounted, so that the pipeline is limited and positioned in the radial direction, the cooling effect of the device is ensured, the temperature of the device in an operation state is reduced, and the service life of the device is prolonged by adopting a welding and fixing mode of the device and the pipeline; the stress condition of the welding seam can be improved, the stress cracking condition of the welding seam is avoided, and the problems and defects in the prior art are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler heating surface tubes, and more specifically, to a long-life, wear-resistant and low-stress guiding and limiting device for the boiler heating surface. Background Art

[0002] Boiler heating surface tubes are an important part of power station boilers. Leakage of boiler heating surface tubes has always been one of the main reasons for unplanned shutdown of thermal power plants, seriously affecting the safe and stable operation of thermal power generation equipment. Therefore, inspection of boiler heating surface is an effective means to ensure long-term safe operation of boilers. In order to ensure the flatness of vertical heating surface tube panels such as platen superheaters, high-temperature superheaters, and high-temperature reheaters, multi-piece heat-resistant steel casting sliding pairs are generally welded on the heating surface tubes to guide and limit, so as to prevent the tube panels from being out of line, deformed, and other problems during boiler operation.

[0003] However, the existing multi-piece sliding pair will be subjected to tensile stress in the front and rear directions of the furnace and in the left and right directions of the furnace during use. These stresses will be concentrated at the inner weld toe of the sliding pair weld. Long-term operation will form cracks at the inner weld toe of the sliding pair weld, causing the sliding pair to fall off and the pipe to be deformed, out of line and washed away.

[0004] In view of this, research and improvement are carried out on the existing problems, and a long-life, wear-resistant and low-stress guide limit device for the boiler heating surface is provided. Through the use of this device, the double-sided welding process can be utilized, which can improve the stress condition of the weld and avoid the occurrence of weld stress cracking. The purpose is to solve the problem and improve the practical value through this technology. Utility Model Content

[0005] The utility model aims to provide a long-life, wear-resistant and low-stress guide and limit device for a boiler heating surface, so as to solve the problems and shortcomings raised in the above-mentioned background technology.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a long-life, wear-resistant and low-stress guide limit device for the heating surface of a boiler, which is achieved by the following specific technical means:

[0007] A long-life, wear-resistant and low-stress guiding and limiting device for a boiler heating surface comprises a heating surface tube, a mounting seat and a sliding pair. The heating surface tubes are installed in a plurality of groups, and the outer surfaces of the plurality of groups of heating surface tubes are all provided with mounting seats. The outer surfaces of the heating surface tubes are all provided with connecting seats, and the connecting seats are symmetrically arranged with the mounting seats, and one side surface of the connecting seats is fixedly connected with a sliding pair.

[0008] As a further optimization of the technical solution, the utility model provides a long-life, wear-resistant and low-stress guide limit device for the heating surface of a boiler, wherein a guide groove is provided through one side surface of multiple groups of the mounting seats, and the guide groove is slidably installed with a sliding pair.

[0009] As a further optimization of the technical solution, the utility model provides a long-life, wear-resistant and low-stress guiding and limiting device for the heating surface of a boiler, wherein the surface of the mounting seat is provided with a first welding foot, and one side surface of the first welding foot is fixedly connected to the outer surface of the heating surface tube.

[0010] As a further optimization of the technical solution, the utility model provides a long-life, wear-resistant and low-stress guiding and limiting device for the heating surface of a boiler, wherein the surface of the mounting seat is provided with a second welding foot, and one side surface of the second welding foot is fixedly connected to the outer surface of the heating surface tube.

[0011] As a further optimization of the technical solution, the utility model provides a long-life, wear-resistant and low-stress guiding and limiting device for the heating surface of a boiler, wherein the sliding pair is made of a high-temperature alloy material and the sliding pair is installed in a plurality of groups.

[0012] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0013] 1. The utility model is equipped with a heating surface pipe, a mounting seat, a guide slide, a sliding pair and a connecting seat. The device can ensure that the axial relative displacement of two adjacent pipelines is free and does not move out of line, avoid increasing abnormal axial stress, and limit the positioning in the radial direction to ensure that the pipelines are neat and do not move out of line. This technology adopts a method of welding and fixing the device and the pipeline to ensure the cooling effect of the device, reduce the temperature of the device under operating conditions, and extend its service life. In addition, the components of this device adopt a riding structure and a double-sided welding process to improve the stress condition of the weld and avoid the occurrence of weld stress cracking.

[0014] 2. The utility model improves the limiting guide device, thereby avoiding the increase of axial stress, limiting the positioning in the radial direction, extending its service life and preventing the weld from cracking due to stress, thereby effectively solving the problems and shortcomings in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model in a top view;

[0018] Figure 3 It is a schematic diagram of the enlarged structure of point A of the utility model.

[0019] In the figure: 1. Heating surface tube; 2. First welding leg; 3. Second welding leg; 4. Mounting seat; 5. Guide slide groove; 6. Sliding pair; 7. Connecting seat. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] See also Figures 1 to 3 , the utility model provides a specific technical implementation scheme:

[0022] A long-life, wear-resistant, low-stress guiding and limiting device for a boiler heating surface comprises a heating surface tube 1, a mounting seat 4 and a sliding pair 6. The heating surface tube 1 is installed in a number of groups, and the outer surfaces of the heating surface tubes 1 of multiple groups are provided with mounting seats 4, and the outer surfaces of the heating surface tubes 1 are provided with connecting seats 7, and the connecting seats 7 are symmetrically arranged with the mounting seat 4, and one side surface of the connecting seat 7 is fixedly connected with the sliding pair 6, and one side surface of the mounting seat 4 of multiple groups is penetrated with a guiding slide 5, and the guiding slide 5 is slidably installed with the sliding pair 6, the surface of the mounting seat 4 is provided with a first weld leg 2, and one side surface of the first weld leg 2 is fixedly connected to the outer surface of the heating surface tube 1, the surface of the mounting seat 4 is provided with a second weld leg 3, and one side surface of the second weld leg 3 is fixedly connected to the outer surface of the heating surface tube 1, and the sliding pair 6 is made of a high-temperature alloy material, and the sliding pair 6 is installed in a number of groups.

[0023] Specifically, the guide and limit device can ensure that the axial relative displacement of two adjacent pipes is free and does not move out of line, avoid increasing abnormal axial stress, and limit the positioning in the radial direction to ensure that the pipes are neat and do not move out of line. The technology adopts the method of welding and fixing the device and the pipe to ensure the cooling effect of the device, reduce the temperature of the device under operation state, and extend its service life. The components of the device adopt a riding structure and a double-sided welding process to improve the stress condition of the weld and avoid cracking of the weld, effectively solving the problems and shortcomings in the prior art.

[0024] Working principle: For the guide limit device, this device satisfies the state that the axial relative displacement of two adjacent pipes is free and does not move out of line, avoids increasing abnormal axial stress, and limits the positioning in the radial direction to ensure that the pipes are neat and do not move out of line; and this device is fixed with the pipe by welding to ensure the cooling effect of the device, reduce the temperature of the device under the running state, and extend its service life; and the components of this device adopt a riding structure and double-sided welding process to improve the stress condition of the weld.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A long-life, wear-resistant and low-stress guide and limit device for a boiler heating surface, comprising a heating surface tube (1), a mounting seat (4) and a sliding pair (6), characterized in that: The heating surface tubes (1) are installed in a plurality of groups, and the outer surfaces of the plurality of groups of heating surface tubes (1) are all provided with mounting seats (4). The outer surfaces of the heating surface tubes (1) are all provided with connecting seats (7), and the connecting seats (7) and the mounting seats (4) are arranged symmetrically, and a sliding pair (6) is fixedly connected to one side surface of the connecting seats (7).

2. The boiler heating surface long-life wear-resistant low-stress guide limiter according to claim 1 is characterized in that: A guide slot (5) is provided through one side surface of each of the plurality of groups of mounting seats (4), and the guide slot (5) is slidably mounted with a sliding pair (6).

3. The boiler heating surface long-life anti-wear low-stress guide limiter according to claim 1 is characterized by: The surface of the mounting seat (4) is provided with a first welding leg (2), and one side surface of the first welding leg (2) is fixedly connected to the outer surface of the heating surface tube (1).

4. The boiler heating surface long-life anti-wear low-stress guide limiter according to claim 1, characterized in that: The surface of the mounting seat (4) is provided with a second welding leg (3), and one side surface of the second welding leg (3) is fixedly connected to the outer surface of the heating surface tube (1).

5. The boiler heating surface long-life anti-wear low-stress guide limiter according to claim 1 is characterized by: The sliding pair (6) is made of a high-temperature alloy material, and the sliding pair (6) is installed in a plurality of groups.

Images