KR101712917B1 - Apparatus for absorbing thermal strain to prevent crack of hsrg casing - Google Patents

Abstract

The present invention relates to a heat distortion absorbing device for preventing cracks in a waste heat recovery boiler casing, and more particularly, to a heat recovery boiler casing for preventing cracks caused by a temperature difference in a surface of a waste heat recovery boiler casing To a thermal deformation absorber. An embodiment of the present invention is a thermal deformation absorption apparatus for preventing cracking of a waste heat recovery boiler casing, the system comprising: a heat conduction pad attached to a site where a surface temperature difference is generated by an exhaust gas flowing through a gas turbine exhaust gas outlet; And a plurality of fins protruding upward are provided on a surface of the heat sink, and the heat conductive pad is attached to the reheater or superheater region of the casing. A thermal deformation absorption facility is provided.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an absorber for absorbing thermal deformation for preventing cracking of a waste heat recovery boiler casing,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat distortion absorbing apparatus for preventing cracks in a waste heat recovery boiler casing, and more particularly, to a casing for a waste heat recovery boiler, in which waste heat recovery to prevent cracks caused by thermal stress, And more particularly to a thermal deformation absorber.

Generally, a combined power generation system refers to a power generation system for obtaining a high thermal efficiency by combining a plurality of power generation cycles.

More specifically, the combined-cycle power generation system comprises a system for converting the exhaust heat of a gas turbine, which is a first power generation cycle, from a waste heat recovery boiler to steam, and then recovering the steam from a steam turbine as a secondary power generation cycle.

However, the combined power generation system is used for peak load using maximum power and takes daily start & stop method. In the hybrid power generation system taking the above-described operation mode, it is difficult to ensure stable operation because it is difficult to ensure the uniformity of the internal flow.

In addition, the combined-cycle power generation system is started and stopped more than 200 times a year, so that thermal stress concentrates at a specific position of the waste heat recovery boiler casing, causing cracks or breakage.

Specifically, in the waste heat recovery boiler, heat exchange occurs between the exhaust gas and the heat transfer pipe from the inlet of the heat transfer pipe. Therefore, the temperature of the exhaust gas suddenly drops from the inlet of the heat transfer pipe, and the surface temperature difference of the casing rapidly increases at this portion. In addition, due to the sudden temperature difference, the amount of thermal expansion of the buckstay, the stiffener, and the casing is different from each other, and thermal stress is generated. As a result, buckstays, stiffeners and casings are cracked and damaged due to thermal stress.

In the case where the above-described problems occur, it is important to prevent the waste heat recovery boiler in advance because heat loss occurs in the waste heat recovery boiler, the thermal efficiency is reduced, and noxious gas leaks and safety problems occur.

Therefore, in order to prevent the above-described problems, there is a need for a heat distortion absorbing device for preventing cracks in the waste heat recovery boiler casing.

In order to solve the above problems, a technical problem of the present invention is to provide a casing of a waste heat recovery boiler used in a combined power generation system, which prevents cracks and breakage of a region vulnerable to thermal stress, And to provide a thermal deformation absorbing apparatus for the same.

According to an aspect of the present invention, there is provided a thermal deformation absorbing apparatus for preventing cracks in a waste heat recovery boiler casing, the apparatus comprising: a heat absorbing unit for absorbing heat generated by exhaust gas flowing through a gas turbine exhaust gas outlet, And a plurality of fins protruding upward from the heat sink are provided on the surface of the heat sink, and the heat conductive pad is disposed on the surface of the heat conductive pad, And is attached to the superheater area.

In one embodiment of the present invention, the waste heat recovery boiler comprises: a casing defining an outer shape of the waste heat recovery boiler; An outlet provided to allow exhaust gas to flow into one side of the casing; A stack formed on the other side of the casing; And a heat transfer pipe provided inside the casing, and a stiffener may be provided on the outer wall of the casing in a lattice form.

In one embodiment of the present invention, the thermal deformation absorption equipment may be provided in the inner space of the stiffener.

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In one embodiment of the present invention, the thermally conductive pad may be made of graphite.

The effect of the thermal deformation absorption equipment for preventing cracking of the waste heat recovery boiler casing according to the present invention will be described as follows.

First, according to the present invention, when the heat distortion absorption facility is used, the durability of the waste heat recovery boiler can be increased.

Specifically, in a waste heat recovery boiler casing, when a thermal deformation absorption facility is installed in a portion where thermal stress is concentrated and cracks and breakages are frequently generated, the durability of the waste heat recovery boiler casing can be increased by reducing thermal stress.

Second, according to the present invention, the cost of starting and checking the waste heat recovery boiler can be reduced when the heat distortion absorption facility is used.

Specifically, when a thermal deformation absorption facility is used, cracking and breakage of the waste heat recovery boiler casing are reduced, and maintenance cost of the waste heat recovery boiler is reduced. In addition, heat loss due to cracking and breakage of the waste heat recovery boiler is reduced, and heat efficiency is increased, so that the start-up cost of the waste heat recovery boiler can be reduced, which is economical.

Third, according to the present invention, it is possible to prevent accidental leakage of noxious gas by preventing cracking and breakage of the waste heat recovery boiler. Therefore, a safe working environment can be created.

Fourthly, according to the present invention, the thermally conductive pad is made of graphite and can quickly absorb the heat of the casing. That is, the heat conduction pad absorbs the heat of the casing rapidly, so that the heat absorbed through the heat sink can be dispersed quickly.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a schematic view showing a region where heat exchange occurs in a waste heat recovery boiler according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a temperature change and a facility according to a position in a waste heat recovery boiler according to an embodiment of the present invention.
3 is a schematic diagram of a waste heat recovery boiler according to another embodiment of the present invention.
4 is a perspective view of a waste heat recovery boiler provided with a thermal deformation absorption facility according to an embodiment of the present invention.
5 is a schematic diagram showing the operation of a thermal deformation absorption apparatus according to an embodiment of the present invention.
6 and 7 are graphs and graphs showing changes in thermal stresses in the casing and the stiffener according to the number of pin units provided in the heat sink according to an embodiment of the present invention.
FIGS. 8 and 9 are views and graphs showing changes in thermal stresses in the casing and the stiffener according to the arrangement of the pin units provided in the heat sink according to the embodiment of the present invention.
10 and 11 are graphs and graphs showing changes in thermal stresses of the casing and the stiffener according to the thickness of the fin unit provided in the heat sink according to an embodiment of the present invention.
12 and 13 are graphs and graphs showing changes in the thermal stresses of the casing and the stiffener according to the height of the pin unit provided in the heat sink according to the embodiment of the present invention.
FIG. 14 is a schematic view showing the operation of the heat distortion absorption equipment in the reheater or superheater region according to an embodiment of the present invention.
15 is an exemplary view showing thermal stresses of a waste heat recovery boiler without a heat distortion absorption facility according to an embodiment of the present invention.
16 is an exemplary view showing thermal stress of a waste heat recovery boiler provided with a thermal deformation absorption facility according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when a part is referred to as "comprising ", it means that it can include other components as well, without excluding other components unless specifically stated otherwise.

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

FIG. 1 is a schematic diagram showing a region where heat exchange occurs in a waste heat recovery boiler according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a temperature change trend according to a position in a waste heat recovery boiler according to an embodiment of the present invention, And FIG. 3 is a schematic view of a waste heat recovery boiler according to another embodiment of the present invention.

1 and 2, the waste heat recovery boiler 10 may include a casing 11, an outlet 12, a stack 13, and a heat transfer pipe (not shown).

The casing (11) can form the outer shape of the waste heat recovery boiler (10). A buck stay 14 and a stiffener 15 may be provided on the outer wall of the casing 11. [

A plurality of buck stays 14 may be provided at predetermined intervals so as to surround the circumference of the casing 11 in the transverse direction. The buck stays 14 can support the entire casing 11 to withstand the pressure or external force generated in the waste heat recovery boiler 10.

The stiffener 15 is provided in a lattice shape on the outer wall of the casing 11 and can support the outer wall of the casing 11 so as not to be deformed.

The outlet 12 is provided at one side of the casing 11, and exhaust gas can be introduced from a gas turbine (not shown).

The stack 13 is provided on the other side of the casing 11, and the exhaust gas can flow out.

The heat transfer tubes are installed inside the casing (11), and can transfer heat between fluids flowing in and out of the heat transfer tubes. That is, the heat transfer pipe can receive the heat of the exhaust gas flowing from the outlet 12.

The waste heat recovery boiler 10 constructed as described above can be roughly classified into five regions according to the heat exchange generated in the casing 11. [

First, the portion of the outlet 12 is a duct entrance region, as shown in FIG.

Next, a reheater or a superheater area is provided at the upper part of the pipe inlet area, as shown in FIG.

Next, an evaporator or a superheater region is provided at the upper part of the reheater or superheater region, as shown in FIG.

Next, a superheater and an economizer zone are provided above the evaporator or superheater zone, as shown in FIG.

Next, an evaporator region is provided above the superheater and the absorber region, as shown in FIG.

As shown in FIG. 2, the waste heat recovery boiler 10 divided into the five regions as described above has different temperatures depending on the respective regions.

Specifically, the abscissa of the graph shown in Fig. 2 represents the temperature, and the ordinate represents the height of the waste heat recovery boiler 10.

As shown in the graph of FIG. 2, the temperature of the exhaust gas at the outlet 12 is 600 ° C. At this time, the outflow opening 12 is provided with a heat insulating material inside and outside, and the casing 11 is not provided with a heat insulating material inside, and a heat insulating material 16 is provided only on the outside. Thus, the tube inlet area can maintain a constant temperature from the hot exhaust gas through the insulating material.

On the other hand, in the reheater or superheater region, the temperature of the exhaust gas rapidly drops to the region where heat exchange is started between the exhaust gas and the heat transfer tube. 2, it can be seen that the temperature of the exhaust gas in the reheater or superheater region is lowered, and the temperature of the casing 11 and the stiffener 15 is temporarily increased to 400 ° C or more and then rapidly decreased again . That is, in the reheating or superheater region, the temperature of the exhaust gas changes abruptly, and the surface temperature difference of the casing 11 rapidly increases. As a result of the sudden temperature difference, the amount of thermal expansion of the buckstay 14, the stiffener 15 and the casing 11 becomes different from each other to increase the thermal stress and the buckstay 14, the stiffener 15 and the casing 11 11) are cracked and damaged due to thermal stress.

Therefore, there is a need for a thermal deformation absorbing apparatus 100 (see Fig. 5) for dispersing the heat generated in the casing 11 in the reheater or superheater region.

In the meantime, although the vertical type waste heat recovery boiler has been described up to now, a horizontal waste heat recovery boiler also needs a thermal deformation absorption facility 100 (see FIG. 5) for the same reason.

As shown in Figs. 1 and 2, in the vertical type waste heat recovery boiler 10, the flow of the exhaust gas is made to be vertical in the casing 11, and for this reason, it is referred to as a "vertical type" waste heat recovery boiler. In this type of waste heat recovery boiler 10, a heat transfer pipe through which a fluid for exchanging heat with exhaust gas flows is installed in a horizontal direction.

3, the horizontal type waste heat recovery boiler 10 is shown, and the same components as those of the previous embodiment are denoted by the same reference numerals. In the horizontal waste heat recovery boiler 10, the flow of the exhaust gas is made to be horizontal in the casing 11, and for that reason, it is called a "horizontal type" waste heat recovery boiler. The outlet 12 is provided at one side of the casing 11 to receive the exhaust gas from an unillustrated gas turbine. A heat transfer pipe is formed inside the casing 11 provided between the outlet port 12 and the stack 13 and the heat transfer pipe is vertically installed so as to exchange heat with the exhaust gas flowing in the horizontal direction.

As with the vertical type waste heat recovery boiler, the temperature of the exhaust gas in the reheater or superheater is rapidly lowered in the horizontal waste heat recovery boiler (10), so that there is a risk of cracking and breakage due to thermal stress in this area. 3, the region where the outlet 12 and the casing 11 are in contact with each other, particularly, the region denoted by a thick solid line in FIG. 3 is a portion vulnerable to thermal stress, and therefore it is necessary to provide a thermal deformation absorbing facility at this portion .

Hereinafter, the thermal deformation absorption equipment 100 (see Fig. 5) will be described in detail.

FIG. 4 is a perspective view of a waste heat recovery boiler provided with a thermal deformation absorption facility according to an embodiment of the present invention, and FIG. 5 is a schematic view illustrating an operation of a thermal deformation absorption facility according to an embodiment of the present invention.

4 and 5, the thermal deformation absorption facility 100 may include a thermal conductive pad 110 and a heat sink 120.

The heat conduction pad 110 may be attached to a portion where a surface temperature difference is generated by the exhaust gas flowing through the outlet 12. In particular, the thermally conductive pad 110 may be attached to the reheater or the superheater region where the surface temperature difference of the casing 11 is most rapidly generated. The attachment position of the heat conductive pad 110 is not limited to the embodiment.

The heat conduction pad 110 is provided in the inner space of the stiffener 15 provided in a lattice shape and the heat conduction pad 110 is formed between the space between the heat sink 120 and the casing 11 and between the heat sink 120 and the stiffener 15 may be filled up.

In addition, the thermally conductive pad 110 may be made of graphite. Accordingly, the heat conduction pad 110 can quickly absorb the heat generated in the casing 11 and transmit the heat to the heat sink 120. That is, it is possible to increase the dispersion speed of the heat generated in the casing 11. [

The material of the heat conduction pad 110 is not limited to one embodiment, and may be made of various materials. That is, a material that absorbs heat quickly generated in the casing 11 and has heat resistance at the same time can be included in one embodiment.

The heat sink 120 may be attached to the heat conductive pad 110.

The heat sink 120 can quickly disperse the heat absorbed from the casing 11 and the stiffener 15 through the heat conductive pad 110. [

Specifically, the fin unit 125 provided in the heat sink 120 is formed of a quadrangular columnar fin or a plate-shaped fin, and can increase the surface area of the heat sink 120 from which heat can be discharged. Accordingly, since the fin unit 125 is provided in the heat sink 120, the heat transferred to the heat sink 120 can be quickly dispersed to the surrounding area.

Hereinafter, the details of the number and shape of the pin units 125 provided in the heat sink 120 will be described.

6 and 7 are graphs and graphs showing changes in thermal stresses in the casing and the stiffener according to the number of pin units provided in the heat sink according to an embodiment of the present invention.

6 (a) is a front view showing the case where seven pin units 125 of the heat sink 120 are provided, and FIG. 6 (b) is a front view showing a case where pin units 125 of the heat sink 120 are 14 And FIG. 6C is a front view showing the case where 28 pin units 125 of the heat sink 120 are provided. 6 (d) is a front view showing the case where 56 pin units 125 of the heat sink 120 are provided.

7 refers to the number of pin units 125, and the vertical axis refers to the thermal stress acting on the casing 11 and the stiffener 15. As shown in Fig. In this case, the unit of thermal stress is Pa.

As shown in Fig. 5 and Fig. 7, when the number of the pin units 125 increases, the change in thermal stress in the casing 11 is insignificant.

However, in the case of the stiffener 15, it can be confirmed that the maximum thermal stress decreases when the number of the pin units 125 increases to 56 pieces. Therefore, the number of pin units of the heat sink 120 may be 56 or more. At this time, the number of pin units provided in the heat sink 120 is not limited to one embodiment.

FIGS. 8 and 9 are views and graphs showing changes in thermal stresses in the casing and the stiffener according to the arrangement of the pin units provided in the heat sink according to the embodiment of the present invention.

8 (a) is a front view showing the case where seven pin units 125 of the heat sink 120 are provided, and FIG. 8 (b) is a front view showing the pin unit 125 of the heat sink 120, And FIG. 8 (c) is a front view showing the case where 30 pin units 125 of the heat sink 120 are arranged in a staggered arrangement. 8 (d) is a front view showing a case where 60 pin units 125 of the heat sink 120 are arranged in a staggered arrangement.

9 refers to the number of pin units 125, and the vertical axis refers to the thermal stress acting on the casing 11 and the stiffener 15. As shown in Fig. In this case, the unit of thermal stress is Pa.

8 and 9, when the pin units 125 are in a staggered arrangement, the thermal stress decreases as the number of the pin units 125 increases.

Conversely, when the pin unit 125 is in a staggered arrangement, the casing 11 increases in thermal stress as the number of the pin units 125 increases.

It is also confirmed that the thermal stresses of the casing 11 and the stiffener 15 are reduced when the pin units 125 are arranged in parallel with each other as compared with when the pin units 125 are arranged in a staggered arrangement.

Accordingly, the pin units 125 may be arranged to have a side-by-side arrangement. At this time, the arrangement of the pin units 125 provided in the heat sink 120 is not limited to the embodiment.

10 and 11 are graphs and graphs showing changes in thermal stresses of the casing and the stiffener according to the thickness of the fin unit provided in the heat sink according to an embodiment of the present invention.

10 (a) is a front view showing the pin unit 125 having a thickness of 3 mm, FIG. 10 (b) is a front view showing a pin unit 125 having a thickness of 5 mm, and FIG. 10 c) is a front view showing the pin unit 125 having a thickness of 7 mm.

11 refers to the thickness of the pin unit 125, and the vertical axis refers to the thermal stress acting on the casing 11 and the stiffener 15. In Fig. At this time, the unit of the pin thickness is mm, and the unit of thermal stress is Pa.

As shown in Figs. 10 and 11, the casing 11 has a small change in thermal stress when the thickness of the pin unit 125 is 5 mm or less, and the thermal stress increases gradually as the thickness of the pin unit 125 increases .

It can be seen that the thermal stress is slightly reduced when the thickness of the pin unit 125 is 5 mm than that of the pin unit 125 is 3 mm and the thermal stress is increased again as the thickness of the pin unit 125 is increased to 7 mm .

That is, when the thickness of the pin unit 125 is 5 mm or more, the thermal stress generated in the casing 11 and the stiffener 15 can be increased. Therefore, the thickness of the pin unit 125 can be set to 5 mm or less. At this time, the thickness of the pin unit 125 is not limited to one embodiment.

12 and 13 are graphs and graphs showing changes in the thermal stresses of the casing and the stiffener according to the height of the pin unit provided in the heat sink according to the embodiment of the present invention.

12 (a) is a front view showing a pin unit 125 having a height of 30 mm, FIG. 12 (b) is a front view showing a pin unit 125 having a height of 50 mm, and FIG. 12 and c is a front view showing the pin unit 125 having a height of 70 mm.

13 refers to the height of the pin unit 125, and the vertical axis refers to the thermal stress acting on the casing 11 and the stiffener 15. In this case, the height unit of the pin unit 125 is mm, and the unit of thermal stress is Pa.

As shown in Figs. 12 and 13, the thermal stress exerted on the stiffener 15 is insignificantly influenced by the height of the pin unit 125. Fig.

When the height of the pin unit 125 is 50 mm or less, the change in the thermal stress in the casing 11 is insignificant.

However, it can be seen that as the height of the pin unit 125 increases to 50 mm or more, the maximum thermal stress acting on the casing 11 is greatly reduced.

Therefore, the height of the pin unit 125 may be 50 mm or more. At this time, the height of the pin unit 125 is not limited to the embodiment.

As described above, according to the test result on the change of the maximum thermal stress depending on the number and the shape of the pin unit 125 provided in the heat sink 120, the heat sink 120 (which is optimized to reduce the maximum thermal stress) Can be determined.

First, the number of pin units 125 provided in the heat sink 120 may be 56 or more. The pin unit 125 may be arranged in a row, the pin unit 125 may have a thickness of 5 mm, and the pin unit 125 may have a height of 50 mm or more.

The number and shape of the pin units 125 provided in the heat sink 120 are not limited to those of the embodiment, and may be variously provided. That is, in the present invention, the heat sink 120 is optimized. However, if the heat sink 120 is provided on the outer wall of the casing 11 and the heat of the casing 11 and the stiffener 15 can be dispersed May all be included in one embodiment.

FIG. 14 is a schematic view showing the operation of the heat distortion absorption equipment in the reheater or superheater region according to an embodiment of the present invention.

As shown in Fig. 14, the thermal deformation absorption facility 100 can be installed in the reheater or superheater region of the casing 11 provided in the waste heat recovery boiler 10. [

The thermal deformation absorbing apparatus 100 provided in the casing 11 absorbs the heat of the casing 11 and the stiffener 15 adjacent to the portion where the thermal deformation absorbing apparatus 100 is installed. Thereafter, the absorbed heat is dispersed again to the periphery of the heat distortion absorbing apparatus 100.

In this way, the thermal deformation absorbing apparatus 100 can be installed at a portion where a rapid temperature difference is generated, such as a reheater or a superheater region, so that the temperature generated in the casing 11 and the stiffener 15 can be evenly dispersed . That is, occurrence of thermal stress due to a rapid temperature difference can be reduced.

To further illustrate this, reference may be made to the following drawings.

15 is an exemplary view showing thermal stress of a waste heat recovery boiler without a thermal deformation absorption facility according to an embodiment of the present invention, Fig. 6 is an exemplary view showing thermal stress of a boiler; Fig.

15 (a) is an illustration showing the distribution of the thermal stresses in the waste heat recovery boiler 10, and FIG. 15 (b) is a graph showing the distribution of the thermal stresses in the waste heat recovery boiler 10, Fig.

15, the reheating or superheater region is a region where the exhaust gas flowing in from the outlet 12 is heat-exchanged with the heat transfer pipe, and the temperature of the reheating or superheater is rapidly lowered to the region where the casing 11 and the stiffener 15 The temperature difference will rapidly increase. That is, as in the case of the distribution of the thermal stress shown in FIG. 15, a high thermal stress due to the temperature difference occurs in the reheater or superheater region.

Specifically, as shown in FIG. 15 (b), the thermal stress was measured by installing six points in the reheater or superheater region. As a result, the thermal stress of the portion corresponding to each point was at least 2.9e + 11 Pa Up to 4.4e + 11Pa.

16 (a) is an illustration showing the distribution of thermal stresses after the installation of the thermal deformation absorber 100 in the waste heat recovery boiler 10, and FIG. 16 (b) Heat stress at a location where the thermal deformation absorber 100 is installed in the reheater or superheater region is measured.

As shown in FIG. 16, it can be confirmed that the thermal stress absorbing apparatus 100 is reheated or installed in the superheater region, and the thermal stress is reduced.

15, the thermal stresses at the respective points were measured. As a result, the thermal stresses at the portions corresponding to the respective points were at least 1.8 e + 11 Pa Up to 2.7e + 11Pa.

That is, as a result of providing the thermal deformation absorption facility 100 in the casing 11 of the waste heat recovery boiler 10, it can be seen that the thermal stress at the location where the thermal deformation absorption facility 100 is installed is greatly reduced.

Therefore, when the heat distortion absorbing equipment 100 described above is used, the durability of the waste heat recovery boiler 10 can be increased.

Specifically, in the casing 11 of the waste heat recovery boiler 10, when the thermal deformation absorption facility 100 is installed in a portion where thermal stress is concentrated and cracks and breakages are frequently generated, the thermal stress is reduced, 11 can be increased.

In addition, when the thermal deformation absorption facility 100 is used, the cost of starting and checking the waste heat recovery boiler 10 can be reduced.

Specifically, when the thermal deformation absorption equipment 100 is used, cracking and breakage of the casing 11 are reduced, and the maintenance cost of the waste heat recovery boiler 10 can be reduced. In addition, since the heat loss due to cracking and breakage of the waste heat recovery boiler 10 is reduced and the heat efficiency is increased, the starting cost of the waste heat recovery boiler 10 can be reduced.

In addition, cracks and breakage that may occur in the waste heat recovery boiler 10 are prevented, so that it is possible to prevent an accident that the harmful gas in the waste heat recovery boiler 10 leaks out. Therefore, a safe working environment can be created.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

10: waste heat recovery boiler 11: casing
12: outlet 13: stack
14: Buck stay 15: Stiffener
16: Heat insulation material 100: Heat distortion absorption equipment
110: heat conduction pad 120: heat sink
125: Pin unit

Claims (5)

Waste Heat Recovery As a thermal deformation absorber for preventing cracking of a boiler casing,
A heat conduction pad attached to a portion where a surface temperature difference is generated by the exhaust gas flowing through the gas turbine exhaust gas outlet,
And a heat sink provided above the thermally conductive pad,
A plurality of fins protruding upward are provided on a surface of the heat sink,
Wherein the thermally conductive pad is attached to a reheater or a superheater region of the casing.
The method according to claim 1,
The waste heat recovery boiler comprises:
A casing forming an outer shape of the waste heat recovery boiler;
The outlet being provided to allow exhaust gas to flow into one side of the casing;
A stack formed on the other side of the casing; And
And a heat transfer tube provided inside the casing,
And a stiffener is provided in a lattice form on an outer wall of the casing.
3. The method of claim 2,
And the thermal deformation absorption facility is provided in the inner space of the stiffener.
The method according to claim 1,
Wherein the thermally conductive pad is made of graphite. delete

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