CN215982502U

CN215982502U - Waste heat recovery boiler superheater structure

Info

Publication number: CN215982502U
Application number: CN202121773757.6U
Authority: CN
Inventors: 丁亚伟
Original assignee: Shanghai Sifang Wuxi Boiler Engineering Co ltd
Current assignee: Shanghai Sifang Wuxi Boiler Engineering Co ltd
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2022-03-08
Anticipated expiration: 2031-08-02

Abstract

The utility model provides a waste heat recovery boiler superheater structure, includes superheater tube bank cluster, superheater tube bank cluster in the bottom of adjacent superheater tube bank communicate through U type union coupling, form independent coiled pipe tube bank, adjacent superheater tube bank is in be located U type union coupling upper portion's position sets up pipe clamp device. The novel superheater structure of the waste heat recovery boiler is adopted, the running safety of the novel superheater structure is higher than that of a superheater bottom structure in the prior art, and the problem of easy breakage and tube explosion of a pipe joint of a header of the conventional superheater is solved; the structure is simpler, easily reforms transform the boiler superheater structure among the prior art simultaneously, only needs to change the superheater bottom into U-shaped union coupling, reforms transform with low costsly, and the operational safety obtains improving, can reduce by a wide margin and lead to the frequency of blowing out because of the superheater trouble.

Description

Waste heat recovery boiler superheater structure

Technical Field

The utility model relates to the technical field of waste heat recovery devices, in particular to a superheater structure of a waste heat recovery boiler.

Background

The superheater is a part for further heating steam from saturation temperature to superheat temperature in the waste heat recovery boiler and consists of a plurality of parallel pipes and an inlet and outlet header. The metal of the pipe wall of the superheater is the highest in temperature of a pressure part of the waste heat boiler, high-temperature-resistant high-quality low-carbon steel and other materials must be adopted, and if the temperature borne by the pipe exceeds the limit values of the endurance strength and the fatigue strength of the materials in the operation of the boiler, accidents such as pipe burst and the like can be caused.

The superheater structure in the prior art all adopts the structure as shown in the attached figure 1, and comprises an upper superheater tube bundle cluster, a superheater drain pipe and a drain header, wherein the lower part of the superheater tube bundle is designed by a bent pipe, and the bent pipe is communicated with the drain pipe in a welding mode, and the structure has the following defects: because the superheater bears very big thermal stress and thermal deviation in the use, wherein vertical direction superheater pipe is compressive stress to the collection case, and horizontal direction return bend superheater pipe is tensile stress to collection case upper portion, and the lower part is compressive stress, and produced influence is: the horizontal direction pipe is easy to be cracked when bearing tensile stress, so that the whole pipe falls off; the problems of expansion and stress concentration are fully considered in the design of a bent pipe of a superheater pipe, the opening strength and the opening mode of a header, and the welding mode and the strength of the pipe and the header, and if defects such as air holes, welding slag, welding beading and the like exist in a welding seam of the pipe, pipe explosion is easily caused, so that the superheater structure in the prior art has higher requirements on welding process and quality, concentrated stress and restrained stress possibly exist during welding to influence the safety of the superheater in the use process, once the superheater breaks down, the whole furnace needs to be shut down for maintenance, and the generated economic loss is very large.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides the superheater structure of the waste heat recovery boiler, which has the advantages of simple structure, low failure rate and high operation safety.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the utility model provides a waste heat recovery boiler superheater structure, includes superheater tube bank cluster, superheater tube bank cluster in the bottom of adjacent superheater tube bank communicate through U type union coupling, form independent coiled pipe tube bank, adjacent superheater tube bank is in be located U type union coupling upper portion's position sets up pipe clamp device.

Further, the tube clamping devices are arranged between adjacent superheater tube bundles and penetrate through the whole superheater tube bundle cluster.

Furthermore, two adjacent superheater tube bundles communicated through the U-shaped tube joint form a superheater tube group, the adjacent superheater tube group on the same plane forms a superheater tube surface, and the tube clamping device is installed on the upper portion of the U-shaped tube joint at the bottom of the superheater tube surface. The pipe clamp device is used for fixing the surface of the superheater pipe communicated through the U-shaped pipe joint, and the adjacent superheater pipe bundles communicated through the U-shaped pipe joint are fixed due to the fact that no drain pipe and a drain header collection box are provided, so that the adjacent superheater pipe bundles are independent coiled pipe bundles, and the pipe clamp device is required to be fixed to improve the operation stability of the superheater pipe bundle cluster.

Further, the U-shaped pipe joints are of a non-axisymmetrical structure, the lower portions of the U-shaped pipe joints protrude to one side, and in the superheater tube bundle cluster, all the U-shaped pipe joints are installed in the same direction, that is, all the U-shaped pipe joints in the superheater tube bundle cluster are located on the same plane or on parallel planes, and the lower portions of all the U-shaped pipe joints protrude to the same side.

Further, adjacent U-shaped pipe joints are arranged one above the other.

Compared with the prior art, the utility model has the advantages that:

the novel superheater structure of the waste heat recovery boiler is adopted, the running safety of the novel superheater structure is higher than that of a superheater bottom structure in the prior art, and the problem of easy breakage and tube explosion of a pipe joint of a header of the conventional superheater is solved; the structure is simpler, easily reforms transform the boiler superheater structure among the prior art simultaneously, only needs to change the superheater bottom into U-shaped union coupling, reforms transform with low costsly, and the operational safety obtains improving, can reduce by a wide margin and lead to the frequency of blowing out because of the superheater trouble.

Drawings

FIG. 1 is a schematic of a prior art superheater configuration;

FIG. 2 is a schematic diagram of a waste heat recovery boiler superheater according to the present invention;

FIG. 3 is a side view structural diagram of the overall structure of the high temperature superheater;

FIG. 4 is a side view of the overall structure of the low temperature superheater.

In the figure, 1-high temperature superheater, 2-low temperature superheater, 3-superheater tube bundle cluster, 4-drain pipe, 5-drain header, 6-welding position, 7-U-shaped pipe joint, 8-pipe clamping device, 9-superheater tube group and 10-superheater tube surface.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

As shown in fig. 1, the superheater structure in the prior art includes a high temperature superheater 1 and a low temperature superheater 2 both composed of a superheater tube bundle cluster 3, the high temperature superheater 1 and the low temperature superheater 2 are both composed of a superheater drain pipe 4 and a drain header 5 both under the superheater tube bundle cluster 3 and the superheater tube bundle cluster 3, the lower part of the superheater tube bundle is designed by a bent pipe, and the bent pipe is communicated with the drain pipe 4 by a welding manner, i.e., the welding position 6 where steam leakage and shedding easily occur.

As shown in fig. 2 to 4, the superheater structure of the heat recovery boiler of the present invention includes a superheater tube bundle cluster 3, wherein the bottoms of adjacent superheater tube bundles in the superheater tube bundle cluster 3 are communicated with each other through a U-shaped tube joint 7 to form an independent serpentine tube bundle, and a tube clamping device 8 is disposed at the upper portion of the U-shaped tube joint 7 of the adjacent superheater tube bundles.

Further, the pipe clamping devices 8 are arranged between the adjacent superheater tube bundles and penetrate through the whole superheater tube bundle cluster 3, and the pipe clamping devices 8 are connected between the superheater tube bundles in a welding mode.

Further, two adjacent superheater tube bundles communicated through the U-shaped tube joint 7 form a superheater tube group 9, the adjacent superheater tube group 9 on the same plane forms a superheater tube surface 10, and the tube clamping device 8 is installed at the upper part of the U-shaped tube joint 7 at the bottom of the superheater tube surface 10. The pipe clamping device 8 is used for fixing the superheater pipe surface 10 communicated through the U-shaped pipe joint 7, and the adjacent superheater pipe bundles communicated through the U-shaped pipe joint 7 are fixed due to the fact that the drain pipes 4 and the drain header 5 are not provided with headers and are independent coiled pipe bundles, so that the pipe clamping device 8 is required to be used for fixing to improve the operation stability of the superheater pipe bundle cluster 3.

Further, the U-shaped pipe joints 7 are of a non-axisymmetrical structure, the lower portions of the U-shaped pipe joints 7 protrude to one side, and in the superheater tube bundle cluster 3, all the U-shaped pipe joints 7 are installed in the same direction, that is, all the U-shaped pipe joints 7 in the superheater tube bundle cluster 3 are located on the same plane or on parallel planes, and the lower portions of all the U-shaped pipe joints 7 protrude to the same side.

Furthermore, the adjacent U-shaped pipe joints 7 are arranged one above the other, and because the lower parts of the U-shaped pipe joints 7 are not in a bilateral symmetry structure and protrude towards one side, the arrangement mode that the U-shaped pipe joints 7 are arranged one above the other can reduce the contact between the adjacent U-shaped pipe joints 7, and is convenient to install and maintain. U type union 7 passes through welded connection with upper portion tube bank with argon arc welding bottoming, and is lower to welding quality requirement, only needs to satisfy requirements such as flaw detection and water pressure, and is low to the technical requirement who reforms transform moreover, and the cost of reforming transform is lower. The waste heat recovery boiler superheater structure is essentially different from superheater structures in the prior art, the problem of stress concentration of a vertical tube bundle and a horizontal tube bundle is solved, and the problem of tube falling caused by tensile stress is avoided.

It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and any modifications made by those skilled in the art without departing from the spirit of the present invention will fall within the protection scope of the present invention.

Claims

1. The utility model provides a waste heat recovery boiler superheater structure, includes superheater tube bank cluster, its characterized in that: the bottom parts of adjacent superheater tube bundles in the superheater tube bundle cluster are communicated through a U-shaped tube joint to form an independent coiled tube bundle, and a tube clamp device is arranged at the position, located at the upper part of the U-shaped tube joint, of the adjacent superheater tube bundles.

2. The superheater structure of the heat recovery boiler according to claim 1, wherein: the pipe clamping devices are arranged between the adjacent superheater pipe bundles and penetrate through the whole superheater pipe bundle cluster.

3. The superheater structure of the heat recovery boiler according to claim 1, wherein: two adjacent superheater tube bundles communicated through the U-shaped tube joint form a superheater tube group, the adjacent superheater tube group on the same plane forms a superheater tube surface, and the tube clamping device is installed on the upper portion of the U-shaped tube joint at the bottom of the superheater tube surface.

4. A superheater structure of a heat recovery boiler according to claim 1 or 3, characterized in that: the U-shaped pipe joints are of non-axisymmetrical structures, the lower parts of the U-shaped pipe joints protrude to one side, and all the U-shaped pipe joints are installed in the same direction in the superheater pipe bundle cluster.

5. The superheater structure of the heat recovery boiler according to claim 4, wherein: and the adjacent U-shaped pipe joints are arranged one above the other.