CN215259742U

CN215259742U - Sliding clamp for adjusting flatness of tube panel of heating surface of boiler and tube panel of heating surface of boiler

Info

Publication number: CN215259742U
Application number: CN202120398263.8U
Authority: CN
Inventors: 康德林
Original assignee: Datang Qinling Power Generation Co ltd
Current assignee: Datang Qinling Power Generation Co ltd
Priority date: 2021-02-23
Filing date: 2021-02-23
Publication date: 2021-12-21
Anticipated expiration: 2031-02-23

Abstract

The utility model provides a pair of adjust slide fastener and boiler heating surface tube panel of boiler heating surface tube panel roughness, including two slide device that the structure is the same, slide device is the cylindricality structure, and its radial cross-section is the rectangle helix, and two slide device overlap each other along the orbit of helix and establish, and two slide device's central end contacts each other, two slide device's free end parallel arrangement to extend to two adjacent pipelines respectively. Two slider overlap each other through the joint space and establish to can relative movement, non-deformable under the high temperature operational environment, two sliding blocks form each other and seal and can not thread off, can guarantee the roughness of tube panel, do not block the free inflation after being heated again between the pipe, the operational reliability is high.

Description

Sliding clamp for adjusting flatness of tube panel of heating surface of boiler and tube panel of heating surface of boiler

Technical Field

The utility model relates to a boiler pipe technical field specifically is a slide fastener of regulation boiler tube panel roughness.

Background

The tube panels of the heating surfaces of a high-temperature superheater, a high-temperature reheater, a platen superheater and the like of a power plant boiler are generally formed by parallelly arranging and combining a plurality of tubes (10 tubes and more than 20 tubes) according to a certain pitch, the flatness of each group of tube panels is less than or equal to 20mm, because the lengths of the tubes from the outermost circle to the innermost circle of each group of heating surface tube panels are different, the smoke temperature of the outer wall of each tube and the medium temperature of each tube are different, and the expansion amount of the tubes after the smoke is heated is also different, in order to ensure that the tubes can freely expand after being heated, adjacent tubes in the heating surface tube panels cannot be welded, in order to ensure that the flatness of the heating surface tube panels reaches the standard and cannot block the downward expansion amount generated by the temperature difference between the adjacent tubes, 3-4 groups of sliding clamps are arranged from top to bottom during the manufacture of the tube panels.

If the tube panel sliding clamp is damaged, tube panel confusion can be caused, the disordered tube panel can cause serious tube panel coke hanging, meanwhile, the problems of fatigue tube explosion of materials with overlarge tube swing amplitude, mechanical abrasion between tubes, wall thickness reduction and the like are solved, the damage of a single heating surface tube in a hearth after tube explosion is greatly amplified, the workload of overhauling and tube replacement is increased by more than ten times, and the tube panel confusion is one of main reasons for causing four-tube explosion of the heating surface of a boiler. Therefore, the sliding blocks between the adjacent tubes are ensured to be intact without deformation and failure when the tube panels of the heating surface of the boiler in the furnace are kept flat and the equipment is safely operated.

Referring to fig. 1 and 2, the existing slide block arrangement mechanism has two types, one type is that two single bodies are combined into a group of slide blocks in an L-shaped structure, after the two L-shaped steels are lapped, a limiting plate is welded on one side of each L-shaped steel to prevent the two L-shaped steels from being deviated and released, but the lower part of the tube panel has larger downward extension and expansion amount after being heated, the thermal stress of the tube panel is also larger, the limiting plate welded on one side cannot resist the thermal stress deformation of the tube panel, and finally the slide block staggered and released is formed; the other type is a wave-shaped clamp, the wave-shaped clamp is connected with the tube panel and fixed in the middle of the wave by utilizing a clamping block or plug welding, under the high-temperature working condition, the wave-shaped clamp is directly heated by smoke, the expansion amount is usually larger than that of the fixed tube panel, the wave-shaped clamp is not easy to fix firmly and is easy to loosen and fall downwards, and the failure is caused.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model provides an adjust slide fastener of boiler heating surface tube panel roughness both satisfies the free expansion between the adjacent pipe, can form closed loop again and restrict mutually, guarantees that the roughness of whole heating surface tube panel satisfies the regulation and is less than or equal to 20mm requirement.

The utility model discloses a realize through following technical scheme:

the utility model provides an adjust slide fastener of boiler heating surface tube panel roughness, includes two slider that the structure is the same, and slider is the cylindricality structure, and its radial cross-section is the rectangle helix, and two sliders overlap each other along the orbit of helix and establish, and the central end of two sliders contacts each other, and two sliders's free end parallel arrangement to extend to two adjacent pipelines respectively.

Preferably, the sliding device comprises a connecting arm and a U-shaped sliding rail, the connecting arm is located at the top of the sliding rail, one end of the connecting arm is connected with one end of the sliding rail, and the other end of the connecting arm penetrates through the top of the other end of the sliding rail.

Preferably, the sliding rail includes a first vertical wall and a second vertical wall which are arranged in parallel and spaced apart, bottom portions of the first vertical wall and the second vertical wall are connected by a bottom plate, and an upper end of the first vertical wall is higher than an upper end of the second vertical wall.

Preferably, the distance between the first vertical wall and the second vertical wall is greater than the width of the second vertical wall.

Preferably, the space between the upper end of the second vertical wall and the connecting arm is greater than the thickness of the base plate.

A tube panel of a heating surface of a boiler comprises a plurality of heat pipes arranged at intervals, a sliding clamp is arranged between every two adjacent heat pipes, and the end part of each sliding device is fixedly connected with the heat pipe.

Preferably, the distance between two adjacent heat pipes is 20mm-35 mm.

Compared with the prior art, the utility model discloses following profitable technological effect has:

the utility model provides a pair of adjust slide clamp of boiler heating surface tube panel roughness, two slider overlap each other through the joint space and establish to can relative movement, non-deformable under the high temperature operational environment, two sliding blocks form each other and seal and can not thread off, can guarantee the roughness of tube panel, do not block the free expansion after being heated between the pipe again, the operational reliability is high.

Drawings

FIG. 1 is a schematic view of a conventional L-shaped slide card;

FIG. 2 is a schematic view of a conventional slider card with a corrugated structure;

FIG. 3 is a schematic view of the installation of the slide card of the present invention;

FIG. 4 is a cross-sectional view of the slide card of the present invention;

fig. 5 is a front view of the slide card of the present invention.

In the figure: 1. a slide card; 2. a heat pipe; 3. a sliding device;

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings, which are provided for purposes of illustration and not limitation.

Referring to fig. 3-5, the sliding clamp for adjusting the flatness of the tube panel of the heating surface of the boiler comprises two sliding devices 3 with the same structure, wherein each sliding device is in a cylindrical structure, the radial section of each sliding device is a rectangular spiral line, the two sliding devices are sleeved with each other along the track of the spiral line, the central ends of the two sliding devices are in contact with each other, and the free ends of the two sliding devices are arranged in parallel and respectively extend towards two adjacent pipelines.

The section of the sliding device is a single-layer rectangular spiral line, and the section of the sliding device is G-shaped.

Each slide device comprises a connecting arm along the horizontal direction, and a U-shaped slide rail, wherein the slide rail comprises a first vertical wall and a second vertical wall which are arranged in parallel and at intervals, the bottom parts of the first vertical wall and the second vertical wall are connected through a bottom plate, the upper end of the first vertical wall is higher than the upper end of the second vertical wall, and the distance between the first vertical wall and the second vertical wall is larger than the width of the second vertical wall.

The connecting arm is located the slide rail opening side top, and the one end of connecting arm is connected with the top of first vertical wall, and the other end passes the top of second vertical wall and is used for being connected with the heat pipe, forms the joint space between first vertical wall and the second vertical wall, bottom plate and the connecting arm.

The two sliding devices are respectively a first sliding device and a second sliding device, when the two sliding devices are installed, the second vertical wall of the first sliding device is positioned in the clamping space of the second sliding device to form a sliding card 1, the connecting arms of the two sliding devices are respectively positioned at the top and the bottom of the sliding card, and the extending directions of the free ends of the two connecting arms are opposite, namely the two connecting arms extend towards the two adjacent heat pipes respectively.

The material of the slide card is 16Cr20Ni14Si2 heat-resistant alloy steel, the length is 80mm, the length of a single side is 25mm, the thickness is 5mm, and the specific size can be slightly adjusted according to the actual field. The sliding clamp is suitable for regulating the flatness of the tube panel with small pitch, namely the tube panel with the pitch between adjacent tubes being more than 20mm and less than 35 mm.

Secondly, each sliding device and the heat pipe only have one welding point, welding workload is reduced, the number of the welding joints for connecting each group of sliding cards with the pipes is reduced from 3 to 2, particularly, one third of welding workload is reduced for the high alloy pipes with extremely strict welding requirements, and simultaneously, pipe leakage and furnace shutdown possibly caused by welding quality problems are also reduced.

The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.

Claims

1. The sliding clamp for adjusting the flatness of the tube panel of the heating surface of a boiler is characterized by comprising two sliding devices (3) with the same structure, wherein each sliding device is of a cylindrical structure, the radial section of each sliding device is a rectangular spiral line, the two sliding devices are sleeved with each other along the track of the spiral line, the central ends of the two sliding devices are in mutual contact, and the free ends of the two sliding devices are arranged in parallel and extend to two adjacent pipelines respectively.

2. The slide fastener for adjusting the flatness of a tube panel on a heating surface of a boiler according to claim 1, wherein the slide means comprises a connecting arm and a U-shaped slide rail, the connecting arm is located at the top of the slide rail, one end of the connecting arm is connected with one end of the slide rail, and the other end of the connecting arm passes through the top of the other end of the slide rail.

3. The slide fastener for adjusting the flatness of a tube panel of a heating surface of a boiler according to claim 2, wherein said slide rail includes a first vertical wall and a second vertical wall arranged in parallel and spaced apart, the bottom portions of the first vertical wall and the second vertical wall being connected by a bottom plate, the upper end of the first vertical wall being higher than the upper end of the second vertical wall.

4. The slide fastener for adjusting the flatness of a tube panel of a heating surface of a boiler according to claim 3, wherein the distance between the first vertical wall and the second vertical wall is larger than the width of the second vertical wall.

5. The slide fastener for adjusting the flatness of a tube panel of a heating surface of a boiler according to claim 3, wherein a space between an upper end of the second vertical wall and the connecting arm is larger than a thickness of the bottom plate.

6. A tube panel of a boiler heating surface, which is characterized by comprising a plurality of heat pipes arranged at intervals, wherein a sliding card (1) according to any one of claims 1-5 is arranged between two adjacent heat pipes, and the end part of each sliding device is fixedly connected with the heat pipe.

7. The tube panel of claim 6, wherein the distance between two adjacent heat pipes is 20mm-35 mm.