CN212511079U

CN212511079U - Novel special connection of boiler stiffening beam device

Info

Publication number: CN212511079U
Application number: CN202021055387.8U
Authority: CN
Inventors: 李钢; 李春晓; 林旭东; 王文锋; 马连敏; 房伟; 王树乾; 郝军; 姜蕾; 马跃东; 卫大为; 赵博
Original assignee: Yantai Power Plant Huaneng Shandong Generating Co ltd
Current assignee: Yantai Power Plant Huaneng Shandong Generating Co ltd
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2021-02-09
Anticipated expiration: 2030-06-10

Abstract

The utility model discloses a novel special connecting device for boiler rigid beams, which comprises a first base body and a second base body, wherein the first base body is provided with a first part, the second base body is provided with a second part, and the first part and the second part form sliding fit along the vertical direction through surface contact; the first base body is arranged on a front wall-wrapping rigid beam of the boiler flue, and the second base body is arranged on a side wall-wrapping rigid beam of the boiler flue. The utility model discloses both can avoid flue fin to draw to split for preceding package wall and side package wall provide sufficient upper and lower inflation space, can also guarantee sufficient rigidity and intensity simultaneously on the horizontal direction, avoid connecting failure to eliminate the potential safety hazard.

Description

Novel special connection of boiler stiffening beam device

Technical Field

The utility model relates to a connecting device specifically is a connecting device to rigid beam on boiler side package wall.

Background

According to incomplete statistics, boilers produced in the period of 2005 of 1990-once, such as boilers of 125MW, 200MW, 300MW and other units of factories such as Kazakhstan, Donggao, Bawei and the like all have the problems of furnace wall shaking, fin cracking, pipe explosion and the like to different degrees, the maximum shaking value reaches 100-once and 150mm, and the performance is most drastic in the starting and stopping stages of the boilers. At present, no scientific research institution specially researching the subject exists in China, and no mature solution is provided.

The expansion unit of the 3 x 150MW of the smoke station power plant adopts a 480t/h natural circulation boiler produced by a Shanghai boiler plant, which is transformed on the basis of a 380t/h boiler of a 125MW unit, and has more structural problems. After the unit operates, the problems of fin cracking, air leakage, leakage and the like frequently occur in the tail flue.

According to the analysis of the operation data and the design drawings of the boiler plant, the problems are caused by the following steps: the front wrapping wall of the rear flue of the furnace and the wrapping walls at the left side and the right side have larger temperature difference (the highest temperature difference is about 100 ℃) due to different media, and the heat expansion amounts of different temperatures are different, so that the heat stress of the welding seams of the fins at the joint of the front wrapping wall and the wrapping walls at the two sides is overlarge.

In order to solve the problem of the pulling crack of the tail flue fin, the fin welding seam and the rigid beam at the joint of the front wrapping wall and the side wrapping wall are cut, so that the front wrapping wall and the side wrapping wall are respectively expanded freely and cannot be mutually torn. However, after the fins are cut, the front wrapping wall and the side wrapping walls are disconnected, the front wrapping wall and the side wrapping walls are fixed only by connecting bolts at the corner plates, the front wrapping wall and the side wrapping walls are dislocated and loosened when the boiler is in a cold state and a hot state alternately, the bolts are broken frequently during operation, the fastening effect is poor, and the connection between the shroud ring beams basically fails. Particularly, the joint of the front wrapping wall of the rear flue and the left and right wrapping walls vibrates most intensely in a continuous stable low-frequency vibration mode accompanied by intermittent large-amplitude shaking, and the maximum peak value reaches 88.21 mm/s. The local maximum stress of the wall-wrapped tube and the fins can be rapidly increased due to the vibration of the furnace wall, and alternating stress corrosion can be generated in a vibration area to cause welding line cracking to cause tube explosion accidents, so that great safety risk exists.

SUMMERY OF THE UTILITY MODEL

The utility model provides a novel boiler rigid beam special connection device, its purpose: under the prerequisite of avoiding the flue fin to draw to split, guarantee to be connected reliably between preceding package wall and the side package wall, prevent to appear rocking by a wide margin.

The utility model discloses technical scheme as follows:

a novel special connecting device for a boiler rigid beam comprises a first base body and a second base body, wherein a first part is installed on the first base body, a second part is installed on the second base body, and the first part and the second part form sliding fit along the vertical direction through surface contact;

the first base body is arranged on a front wall-wrapping rigid beam of the boiler flue, and the second base body is arranged on a side wall-wrapping rigid beam of the boiler flue.

As a further improvement of the device: the first substrate is a first steel plate, and the second substrate is a second steel plate; the first steel plate is positioned on the right side of the second steel plate;

the first component comprises a first positioning block; the first positioning block comprises a rod-shaped first block body horizontally arranged in the left-right direction, a second block body connected to the rear side of the first block body and a third block body connected to the front side of the first block body; the second block is positioned at the left side of the third block;

the second component comprises a second positioning block positioned on the left side of the third block and a third positioning block positioned on the right side of the second block;

the internal corner formed by the first block and the third block is in contact fit with the second positioning block, and the internal corner formed by the first block and the second block is in contact fit with the third positioning block.

As a further improvement of the device: the bottom of the first block body is provided with a first boss, the cross section of the first boss is in a trapezoid shape with a wide upper part and a narrow lower part, the bottom of the first boss is in contact with the top surface of the first steel plate, and two side inclined planes of the first boss and the top surface of the first steel plate respectively form welding grooves;

the second locating piece is the same with the structure of third locating piece, all includes: the cross section of the second boss is in a trapezoid shape with a wide upper part and a narrow lower part, the bottom of the second boss is in contact with the top surface of the second steel plate, and the inclined planes on the two sides of the second boss and the top surface of the second steel plate respectively form a welding groove.

Compared with the prior art, the utility model discloses following beneficial effect has: (1) the connecting device is used for replacing a bolt connecting device between the front wrapping wall and the side wrapping wall at present, so that the front wrapping wall and the rigid beam of the side wrapping wall are in sliding connection, the front wrapping wall and the rigid beam of the side wrapping wall can freely slide relative to each other in the vertical direction, the flue fins are prevented from being pulled apart, meanwhile, enough rigidity and strength can be ensured in the horizontal direction, the connection failure is avoided, and the potential safety hazard is eliminated; (2) the bottom of the positioning block skillfully adopts an inverted trapezoidal structure to form welding grooves on two sides, so that the steel plate and the positioning block are conveniently fixedly connected, and a gap can be reserved between the left part of the first positioning block and the second steel plate to reserve a space for sliding up and down.

Drawings

Fig. 1 is a schematic perspective view of the present device.

Fig. 2 is a top view of the present apparatus.

Fig. 3 is a schematic view of the first positioning block along the direction a in fig. 2.

Fig. 4 is a schematic structural diagram of the second positioning block and the third positioning block.

Detailed Description

The technical scheme of the utility model is explained in detail below with the attached drawings:

in the early stage, in order to solve the problem of the pulling crack of the tail flue fin, the fin welding seam and the rigid beam at the joint of the front wrapping wall and the side wrapping wall are cut off, so that the front wall and the side wall can respectively and freely expand and cannot be mutually torn. After the fins are cut, the front wrapping wall and the side wrapping walls are disconnected, the front wrapping wall and the side wrapping walls are fixed only by connecting bolts at the corner plates, the front wrapping wall and the side wrapping walls are staggered and loosened when the boiler is in a cold state and a hot state alternately, the bolts are broken frequently during operation, the fastening effect is poor, and the connection between the shroud ring beams basically fails.

In this embodiment, the special connecting device provided by this patent is used to replace the original bolt connection structure at the positions where the front wall of the rear flue is originally fixed by bolts at the elevation positions of 28.5 meters and 31.5 meters.

The connecting device comprises a first base body and a second base body, wherein the first base body is arranged on a front wall-wrapping rigid beam of the boiler flue, and the second base body is arranged on a side wall-wrapping rigid beam of the boiler flue. The first base body is provided with a first component, the second base body is provided with a second component, and the first component and the second component form sliding fit in the vertical direction through surface contact.

The sliding fit can be realized by matching a square hole as the first component with a square shaft as the second component, or by matching a cylindrical positioning shaft as the first component with a positioning hole as the second component. This embodiment has emphatically proposed a structure that the structure is simpler, the construction is more convenient, as follows:

as shown in fig. 1 and 2, a first steel plate 1 is used as a first base body and is fixed at the end part of a rigid girth beam of the front wall; and a second steel plate 2 is used as a second base body and is fixed at the end part of the side wall wrapping rigid shroud ring beam. It is assumed that the first steel plate 1 is located on the right side of the second steel plate 2.

As in fig. 1 to 3, the first part comprises a first positioning block 3; the first positioning block 3 comprises a rod-shaped first block body 3-1 which is horizontally arranged in the left-right direction, the cross section of the first block body 3-1 is rectangular, and the first positioning block further comprises a second block body 3-2 connected to the rear side of the left end of the first block body 3-1 and a third block body 3-3 connected to the front side of the middle part of the first block body 3-1; the second block 3-2 is located on the left side of the third block 3-3.

The bottom of the right end of the first block body 3-1 is provided with a first boss 3-4, the cross section of the first boss 3-4 is in a trapezoid shape with a wide upper part and a narrow lower part, the bottom of the first boss 3-4 is in contact with the top surface of the first steel plate 1, two inclined surfaces of the first boss 3-4 and the top surface of the first steel plate 1 respectively form a welding groove (the included angle is 45 degrees), and the first positioning block 3 is fixed on the first steel plate 1 in a welding mode.

As shown in fig. 1, 2 and 4, the second member includes a second positioning block 4 located at the left side of the third block 3-3 and a third positioning block 5 located at the right side of the second block 3-2.

The second positioning block 4 and the third positioning block 5 have the same structure and both comprise: the second block 45-1 and the second boss 45-2 are located at the bottom of the fourth block 45-1, the cross section of the second boss 45-2 is in a trapezoid shape with a wide upper part and a narrow lower part, the bottom of the second boss 45-2 is in contact with the top surface of the second steel plate 2, and the inclined planes at the two sides of the second boss 45-2 and the top surface of the second steel plate 2 respectively form a welding groove. The second positioning block 4 and the third positioning block 5 are fixed on the second steel plate 2 respectively through a welding mode.

Referring to fig. 1 and 2, the internal corner formed by the first block 3-1 and the third block 3-3 is in contact fit with the second positioning block 4, and the internal corner formed by the first block 3-1 and the second block 3-2 is in contact fit with the third positioning block 5. Meanwhile, gaps are reserved between the bottom surfaces of the first block 3-1, the second block 3-2 and the third block 3-3 and the second steel plate 2.

As shown in fig. 1 and 2, the first positioning block 3, the second positioning block 4 and the third positioning block 5 are in contact with each other through four groups of planes, so that the sliding fit is realized, the mutual movement of the first steel plate 1 and the second steel plate 2 in the horizontal direction is strongly restricted, and the shroud ring beams of the front enclosure wall and the shroud ring beams of the side enclosure wall can only move relatively in the vertical direction.

When the cold state and the hot state of the boiler are alternated, the device can provide sufficient upper and lower expansion spaces for the front wrapping wall and the side wrapping wall, and the flue fins are prevented from being pulled to be cracked. When the horizontal direction rocks between the front wrapping wall of the flue and the left and right wrapping walls, the connecting device can provide enough connecting rigidity and strength, inhibit the vibration of the tail flue, avoid the cracking of welding seams caused by alternating stress, cause pipe explosion accidents, and eliminate safety risks.

Claims

1. The utility model provides a novel special connecting device of boiler stiffening beam which characterized in that: the device comprises a first base body and a second base body, wherein a first part is arranged on the first base body, a second part is arranged on the second base body, and the first part and the second part form sliding fit in the vertical direction through surface contact;

2. The special connecting device for the boiler rigid beam as claimed in claim 1, is characterized in that: the first substrate is a first steel plate (1), and the second substrate is a second steel plate (2); the first steel plate (1) is positioned on the right side of the second steel plate (2);

the first component comprises a first positioning block (3); the first positioning block (3) comprises a rod-shaped first block body (3-1) which is horizontally arranged in the left-right direction, a second block body (3-2) connected to the rear side of the first block body (3-1) and a third block body (3-3) connected to the front side of the first block body (3-1); the second block (3-2) is positioned at the left side of the third block (3-3);

the second part comprises a second positioning block (4) positioned on the left side of the third block (3-3) and a third positioning block (5) positioned on the right side of the second block (3-2);

the internal corner formed by the first block body (3-1) and the third block body (3-3) is in contact fit with the second positioning block (4), and the internal corner formed by the first block body (3-1) and the second block body (3-2) is in contact fit with the third positioning block (5).

3. The special connecting device for the boiler rigid beam as claimed in claim 2, characterized in that: a first boss (3-4) is arranged at the bottom of the first block body (3-1), the cross section of the first boss (3-4) is in a trapezoid shape with a wide upper part and a narrow lower part, the bottom of the first boss (3-4) is in contact with the top surface of the first steel plate (1), and inclined planes at two sides of the first boss (3-4) and the top surface of the first steel plate (1) respectively form welding grooves;

the second positioning block (4) and the third positioning block (5) are identical in structure and comprise: the cross section of the fourth block body (45-1) and a second boss (45-2) located at the bottom of the fourth block body (45-1), the shape of the cross section of the second boss (45-2) is a trapezoid with a wide upper part and a narrow lower part, the bottom of the second boss (45-2) is in contact with the top surface of the second steel plate (2), and the inclined planes at the two sides of the second boss (45-2) and the top surface of the second steel plate (2) respectively form welding grooves.