KR200328896Y1 - Heat treatment apparatus for heat exchange tube of Heat Recovery Steam Generator - Google Patents

Abstract

The present invention relates to a heat treatment tube heat treatment apparatus that can be easily performed on-site heat treatment for the removal of residual weld stress of the waste heat recovery boiler tube.

Heat transfer tube heat treatment apparatus of the waste heat recovery boiler according to the present invention, the header 4 is disposed on both sides, a plurality of heat exchange tube 6 is disposed between the header 4 on both sides, the plurality of heat exchange tubes ( In the heat-transfer tube (2) to which the end of 6) is inserted and welded to both headers (4), a heat treatment apparatus for removing the welding residual stress of the heat-transfer tube (2) header, the heat-transfer tube (2) One side header 4 of the has a size that can be inserted into the upper side of the box shape, the groove portion 14 for mounting the heat exchange tube 6 welded to the header 4 on one side of the upwardly open peripheral portion 12 (11), the main body of which is outlined; And a cover 100 covering an upper surface of the opening of the enclosure 11, wherein a heat transfer body 50 is provided inside the enclosure 11 to provide a heat treatment temperature, and on one side wall of the enclosure 11. A plurality of thermocouples 60 for temperature control inside the enclosure 11 is provided.

The heat treatment apparatus according to the present invention has a structure corresponding to the size of the header, which can be installed in the heat transfer tube welding workshop and can be locally heat treated only for the welded portion.

Therefore, since the heat treatment tube can be immediately heat-treated in the workplace without the need to move the heat transfer tube as in the prior art, there is an advantage that the heat treatment process is simplified and the heat treatment time can be shortened.

In addition, there is an advantage that the process can be shortened and the heat treatment cost can be reduced since only a necessary portion can be heat treated locally without the need to heat-treat the entire heat transfer tube as in the related art.

Description

Heat treatment apparatus for heat exchange tube of Heat Recovery Steam Generator}

The present invention relates to a technology for manufacturing a heat transfer tube (HR: HARP) of a waste heat recovery boiler (HRSG), in particular, during heat treatment to remove residual stress of the heat transfer tube, Iii) Heat treatment tube heat treatment equipment that enables the heat treatment at the work place immediately without the need to move to the equipment, and heat treatment only the necessary parts effectively.

The waste heat recovery boiler is a boiler for generating steam by using high-temperature exhaust gas emitted after power generation in a gas turbine, and for generating power by driving a steam turbine using the generated steam. Heat transfer tubes (HARP) for heat exchange with the exhaust gases coming from the steam turbine are arranged in several stages.

The one heat transfer tube is provided with headers on both sides, and a plurality of heat exchange tubes are disposed between the headers on both sides, and ends of the plurality of heat exchange tubes are inserted and welded to the headers on both sides. The water flowing in the heat transfer tube is evaporated by the exhaust gas flowing from the turbine is converted into steam, and the steam is used to drive the steam turbine.

As described above, the heat transfer tube welds a plurality of heat exchange tubes to the header, so that the residual stress generated during the welding is removed by performing heat treatment after the welding.

The conventional heat treatment method for removing the welding residual stress of the heat transfer tube was carried out by transporting or moving the manufactured heat transfer tube to a separate heat treatment facility, and then charging the whole heat transfer tube into the heat treatment furnace.

For example, since the above-described heat transfer tube is usually large in length of more than 12 m, according to the conventional method, it is expensive to purchase and maintain an expensive large heat treatment furnace, and it is very inconvenient and time-consuming to transport or move. Had a problem.

In addition, the heat transfer tube has a problem that it takes a lot of work time because the size of the product is very large as described above, because the standby time before the input to the heat treatment furnace becomes long due to the charging limit of the heat treatment furnace.

In addition, since the entire heat transfer tube is introduced into the heat treatment furnace, there is a problem in that the operating cost of the heat treatment furnace is increased by heat treatment to the portion where the heat treatment is not required.

The present invention was developed to solve the conventional problems as described above, when the heat treatment for the removal of the residual stress of the heat transfer tube, heat treatment tube can be immediately heat-treated in the workplace without having to move to the heat treatment facility, The purpose of the present invention is to provide a heat treatment tube heat treatment apparatus capable of locally heat treating the bay, thereby simplifying the heat treatment work process, shortening the heat treatment time, and reducing the heat treatment cost.

1 is a perspective view of a heat treatment tube heat treatment apparatus of the waste heat recovery boiler according to the present invention

2 is a plan view of FIG. 1

3 is a front view of FIG. 1

4 is a rear view of FIG.

5 is a cross-sectional view of the enclosure

Figure 6 is a plan view showing a state in which the heat transfer tube is mounted on the housing

<Explanation of symbols for the main parts of the drawings>

2: electrothermal tube 4: header

6: heat exchange tube 10: heat treatment device

11: enclosure 12: circumference

14 groove 16 side wall

18: insertion hole 20: case

22: heat insulation layer 24: fireproof layer

26: fireproof layer 28: heat insulating material layer

50: heating element 60: thermocouple

100: cover

In order to achieve the above object, the present invention, the header is arranged on both sides, a plurality of heat exchange tubes are disposed between the header of both sides, the ends of the plurality of heat exchange tubes are inserted into the both headers and welded In the heat transfer tube, a heat treatment apparatus for removing the welding residual stress of the heat transfer tube header portion, one side of the heat transfer tube has a box shape of the upper opening to the size that can be inserted, the header portion on one side of the upper opening And a cover covering the upper surface of the opening for recessing the heat exchange tube portion welded thereto, and a cover covering an upper surface of the opening of the enclosure, wherein a heat transfer body is provided inside the enclosure to provide a heat treatment temperature. A plurality of thermocouples for temperature control inside the enclosure is provided.

The heat transfer body is preferably formed through the insertion hole in the side wall of the enclosure, and inserted into the enclosure through the insertion hole. According to such a structure, installation and maintenance of a heat exchanger become easy.

In addition, the enclosure is characterized in that the heat insulating material layer is formed on the inner bottom of the case, the fire resistant layer is formed on the heat insulating material layer, the fire resistant layer is formed on the inner side wall of the case, the heat insulating material layer is formed. .

According to such a structure, the said heat insulating material layer can prevent that the heat inside is discharged | emitted through the clearance gap of the fireproof layer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a heat treatment tube heat treatment apparatus for a waste heat recovery boiler according to the present invention, Figure 2 is a plan view of Figure 1, Figure 3 is a front view of Figure 1, Figure 4 is a rear view of Figure 1, 5 is a cross-sectional view of the enclosure.

As shown in Figures 1 to 4, the heat transfer tube heat treatment apparatus 10 according to the present invention, including the housing 11 and the cover 100.

The enclosure 11 has a box shape in which an upper side header 4 of the heat transfer tube 2 (see FIG. 6) is insertable and has an upper opening, and the header 4 at one side of the upper opening 12. The groove part 14 for mounting the part of the heat exchange tube 6 welded to) is provided.

The cover 100 is to cover the upper portion of the housing 11, the outer surface of its outer surface is provided with a ring 102 to be lifted by a crane.

In addition, a heat transfer body 50 is provided inside the enclosure 11 to provide a heat treatment temperature, and a plurality of thermocouples 60 for temperature control inside the enclosure 11 are provided at one side wall of the upper portion of the enclosure 11. (Thermocouple) is provided.

The heat transfer body 50 is formed to penetrate the insertion hole 18 through the side wall 16 of the housing 11, and is inserted into the enclosure 11 through the insertion hole 18. The insertion hole 18 serves to facilitate the installation of the heat transfer body 50 and to be easily withdrawn during maintenance.

And the enclosure 11, as shown in detail in FIG. 5, is provided with a case 20, the heat insulating material layer 22 is formed on the inner bottom of the case 20, the fireproof material on the heat insulating material layer 22. Layer 24 is formed. In addition, a fireproof layer 26 is formed inside the sidewall of the case 20, and a heat insulating material layer 28 is formed on the fireproof layer 26.

The fireproof layers 24 and 26 may be made of a fire brick or a cement structure, and the heat insulation layer 28 may fill gaps generated in the fireproof layers 24 and 26 and may emit internal heat. To prevent them.

It describes the process of performing the heat treatment using the heat treatment apparatus of the present invention made as described above.

FIG. 5 shows a state in which the heat transfer tube 2 is mounted on the housing 11 in the heat treatment.

In performing the heat treatment on the heat transfer tube 2, the heat treatment apparatus 10 is disposed to face each other on both left and right sides.

Then, the header 4 on both sides of the heat transfer tube 2 is matched to the housing 11 while the cover 100 is removed, and the heat exchange tube 6 of the heat transfer tube 2 is aligned with the groove portion of the housing 11. 14). Then, the heat transfer tube 2 is mounted between the two housings 10 while the header 4 portion including the welded portion of the heat exchange tube 6 requiring heat treatment is positioned inside the enclosure 11.

In this way, it is possible to heat-treat only the part of the header 4 to which the heat-exchange tube 6 was welded, without heat-processing the whole heat-transfer tube 2 like conventionally.

In addition, the heat treatment apparatus 10 according to the present invention has a small size corresponding to the size of the header portion, and can be easily installed in the workplace because electricity is used as the heat source. Therefore, it is not necessary to transport the header 2 for heat treatment, and it becomes possible to heat treatment immediately in the workshop.

Thereafter, the hook 102 is hooked with a crane or the like to lift the cover 100 to cover the housing 11, and a heat is applied by applying a current to the heat transfer body 50.

As described above, the heat treatment apparatus according to the present invention is a small size corresponding to the size of the header, and can be installed in the heat transfer tube welding workshop, and has a structure capable of locally heat treatment only for the welded portion.

Therefore, since the heat treatment tube can be immediately heat-treated in the workplace without the need to move the heat transfer tube as in the prior art, there is an advantage that the heat treatment process is simplified and the heat treatment time can be shortened.

In addition, there is an advantage that the process can be shortened and the heat treatment cost can be reduced since only a necessary portion can be heat treated locally without the need to heat-treat the entire heat transfer tube as in the related art.

Claims (3)

Headers 4 are arranged on both sides, and a plurality of heat exchange tubes 6 are disposed between the headers 4 on both sides, and ends of the plurality of heat exchange tubes 6 are inserted into the headers 4 on both sides. In the heat transfer tube (2) to be welded, as a heat treatment apparatus for removing the welding residual stress of the heat transfer tube (2) header portion, One side header 4 of the heat transfer tube 2 has a box shape that is open to the upper side in a size that can be charged, a portion of the heat exchange tube 6 welded to the header 4 on one side of the upward opening circumference 12 A housing 11 having recessed grooves 14 to be seated therein; And It includes a cover 100 for covering the upper surface of the opening of the enclosure 11, The heat exchanger 50 is provided inside the enclosure 11 to provide a heat treatment temperature, and one side wall of the enclosure 11 is provided with a plurality of thermocouples 60 for temperature control inside the enclosure 11. Heat transfer tube heat treatment apparatus of the waste heat recovery boiler. The method of claim 1, The heat transfer body 50 is formed through the insertion hole 18 through the side wall 16 of the enclosure 11, and is inserted into the enclosure 11 through the insertion hole 18, characterized in that waste heat Heat transfer tube heat treatment apparatus for recovery boiler. The method of claim 1, The enclosure 11 has a heat insulating material layer 22 formed on the bottom of the case 20, a fireproof layer 24 is formed on the heat insulating material layer 22, and the inside of the side wall 16 of the case 11. Heat-resistant tube heat treatment apparatus for a waste heat recovery boiler, characterized in that the refractory layer (24) is formed, and the heat insulating material layer (28) is formed on the refractory layer (26).