Patent Description:
In general, a combined cycle power generation system includes a gas turbine system that combusts fuel to generate high-pressure and high-temperature combustion gases and uses this high-temperature and high-pressure combustion gas to drive a gas turbine to generate electricity, a heat recovery steam generator (HRSG) that drives the gas turbine and recovers the heat of the discharged combustion gases, and a steam turbine system that uses high-temperature and high-pressure steam generated by the heat recovery steam generator to drive a steam turbine to generate electricity.

The HRSG is a combined cycle facility that does not discharge, into the atmosphere, but re-utilizes the high-temperature exhaust gases generated by the gas turbine to generate steam and rotate the steam turbine.

Specifically, the HRSG used in combined cycle power generation is connected to an outlet of the gas turbine to recover heat of the discharged high-temperature exhaust gases while bypassing the exhaust gases. The HRSG is composed of an evaporator that converts saturated liquid into saturated steam, a superheater that heats the saturated steam to a high temperature, and an economizer that is designed to be heated to a temperature condition required by the steam turbine so as to heat feedwater introduced from a condenser into a saturated liquid.

However, in a conventional HRSG, a flow of exhaust gases is not homogenized. Accordingly, when the gas turbine exhaust (GTE) enters the HRSG, a flow of GTE develops into a completely turbulent flow, being in a highly uneven state in terms of flow rate and temperature.

Therefore, it is necessary to consider an apparatus to homogenize a flow of exhaust gases to improve the efficiency of the heat recovery steam generator and prevent damage to a heat transfer tube of the high pressure superheater.

<CIT> presents a heat recovery steam generator, HRSG, that includes: a plurality of vertically-aligned HRSG tubes; and a plurality of stepped tube restraints coupled to the plurality of vertically aligned HRSG tubes. Each stepped tube restraint includes a plurality of tube restraints. The plurality of tube restraints are arranged in an array such that each successive tube restrain is vertically higher than and axially aft of an adjacent tube restraint.

Accordingly, the present disclosure has been made keeping in mind the above problems occurring in the related art, and an objective of the present invention is to provide an exhaust gas flow regulator capable of homogenizing a flow of exhaust gases to improve the efficiency of a heat recovery steam generator and prevent damage to a heat transfer tube or the like of a high pressure superheater, and a heat recovery steam generator (HRSG) including the same.

According to an aspect of the present invention, there is provided an exhaust gas flow regulator according to claim <NUM>.

According to an aspect of the present invention, there is provided an exhaust gas flow regulator including: a plurality of first tubes extending in an extension direction and being spaced apart from each other in a (spacing) direction perpendicular to the extension direction; a support plate disposed perpendicular to the extension direction of the plurality of first tubes and through which the plurality of first tubes penetrates; and at least one second tube coupled to one end of the support plate and extending parallel to the plurality of first tubes, wherein the second tube is provided with a guide plate configured to redirect exhaust gases flowing around or on the second tube toward the plurality of first tubes.

The exhaust gas flow regulator according to any one of these aspects may have one or more of the following features:
The exhaust gas flow regulator may be for a heat recovery steam generator according to any one of the herein described embodiments.

The first tubes may extend in the extension direction. The first tubes may be spaced apart from each other in a spacing direction perpendicular to the extension direction. The support plate may extend in the spacing direction. A first direction may be defined to be perpendicular to the extension direction and to the spacing direction. A flow direction of the exhaust gases flowing through the plurality of first tubes, i.e. between the first tubes, may be in the first direction.

The second tube may be coupled to the one end of the support plate. Two second tubes may be provided, one thereof coupled to each of both ends of the support plate.

The second tube may be disposed at both ends of the support plate, and/or the guide plate may be disposed at either of the second tube disposed at both ends of the support plate.

The guide plate may be rotatably connected to the second tube. An axis of rotation of the guide plate may extend parallel to the extension direction. The guide plate may be rotatably connected to the second tube so that a flow direction of the exhaust gases flowing between the second tube and a first tube of the plurality of the first tubes adjacent to the second tube is directed toward the first tube.

The exhaust gases may flow from one side of the plurality of first tubes to the other side. The guide plate may be configured to redirect the exhaust gases flowing from one side of the plurality of first tubes toward the other side. The exhaust gases may flow through the plurality of first tubes, the first tubes being spaced apart from each other. A flow direction of the exhaust gases may be perpendicular to the extension direction and/or to the spacing direction. The flow direction of the exhaust gases may be in the first direction.

The exhaust gas flow regulator may further include a coupling plate coupling the second tube to the support plate. One end of the coupling plate may be coupled to the second tube and the other end of the coupling plate may be coupled to the support plate. The support plate and the coupling plate may be coupled by bolts. In particular, the exhaust gas flow regulator may include a coupling plate having one end coupled to the second tube disposed on both sides of the support plate and the other end coupled to an end of the support plate, wherein the support plate and the coupling plate may be coupled together by bolts.

Both ends of the support plate may be provided with bolt holes formed for engagement with the coupling plate. One of the bolt holes may be formed as a long hole extending in the vertical direction or in the spacing direction.

The second tube may further include an edge plate rotatably coupled to the second tube.

The edge plate may be connected to a side of the second tube that is opposite to a location where the support plate is coupled to the second tube.

According to another aspect of the present invention, there is provided a heat recovery steam generator (HRSG), e.g. designed to facilitate the recovery of heat from high-temperature combustion exhaust gases discharged from a gas turbine, the HRSG including: at least one stack; a heat transfer tube unit disposed on a lower side of the stack; an air duct including a plurality of flow paths having different cross-sectional areas and through which the exhaust gases flow from the gas turbine to the stack; and an exhaust gas flow regulator disposed in the air duct, the exhaust gas flow regulator being according to any one of the herein described embodiments.

According to another aspect of the present invention, there is provided a heat recovery steam generator (HRSG), e.g. designed to facilitate the recovery of heat from high-temperature combustion exhaust gases discharged from a gas turbine, the HRSG including: at least one stack; a heat transfer tube unit disposed on a lower side of the stack; an air duct including a plurality of flow paths having different cross-sectional areas and through which the exhaust gases flow from the gas turbine to the stack; and an exhaust gas flow regulator disposed in the air duct, the exhaust gas flow regulator including: a plurality of first tubes spaced apart from each other in a vertical direction; a support plate disposed perpendicular to an extension direction of the plurality of first tubes and through which the plurality of first tubes penetrates; and a second tube disposed at one or both ends of the support plate, configured to be coupled to the support plate, and extending parallel to the vertical direction, wherein the second tube is provided with a guide plate configured to redirect exhaust gases flowing around the second tube toward the plurality of first tubes. The exhaust gas flow regulator may be according to any one of the herein described embodiments.

The HRSG according to any one of these aspects may include one or more of the following features:
The air duct may include a first flow path into which exhaust gases are introduced into the air duct and a second flow path extending from the first flow path. A flow direction of the exhaust gases in the first and second flow paths may be in the/a first direction. The first and the second flow path may have a common center axis, e.g. extending in a/the first direction. A second direction may be defined to be perpendicular to the first direction and/or to the vertical direction.

In particular, the air duct may include at least one of: a first flow path into which exhaust gases (i.e. from the gas turbine) are introduced, a second flow path extending from the first flow path and having a cross-sectional area extending in a width direction of the air duct, and a third flow path extending diagonally from the second flow path in a height direction of the air duct. The third flow path may extend diagonally, i.e. in the vertical direction and in a flow direction of the exhaust gases in the first flow path. The second flow path may connect the first flow path to the third flow path. The height direction of the air duct may be in the vertical direction.

The exhaust gas flow regulator may be positioned on (at least one of) both sides of the width direction on or adjacent to an inlet portion of the second flow path. The exhaust gas flow regulator may be positioned in the first air flow path or in the second air flow path, adjacent to the inlet portion of the second flow path. The inlet portion of the second flow path may be adjacent to or connected to the first flow path. Each of the (first) exhaust gas flow regulator may be installed in the height direction. That is, the exhaust gas flow regulator, and in particular the support plate thereof, may extend in vertical or height direction. Thus, the extension direction of the first tubes may be in the vertical direction and/or the spacing direction of the first tubes may be in the second direction.

The guide plate may be disposed on the second tube that is positioned at a predetermined distance from a surface forming the air duct.

The guide plate may be disposed such that a flow direction of the exhaust gases flowing from the first flow path to the second flow path is diverted toward the plurality of first tubes.

The guide plate may be disposed to allow the exhaust gases to flow away from the surface of the air duct forming the second flow path.

The exhaust gas flow regulator may be positioned on both sides of an inlet portion of the third flow path, in a direction where a flow path transitions from the second flow path to the third flow path.

The guide plate may be disposed to allow the exhaust gases to flow toward a center of the third flow path.

The second tube may further include an edge plate rotatably coupled to the second tube, the edge plate being disposed between the surface forming the air duct and the second tube.

The effects of the exhaust gas flow regulator and the heat recovery steam generator including the same according to the present invention will be described as follows.

In the exhaust gas flow regulator according to one embodiment of the present invention, the coupling plate coupled with the second tube, and the support plate having the vertically extending long hole are connected to each other by bolts so that the bolts are movable along the long hole, providing the effect of absorbing thermal expansion of the support plate.

As such, the exhaust gas flow regulator according to one embodiment of the present invention has the effect of diffusing the exhaust gases flowing along the outer side of the flow path toward the center of the flow path by being disposed along both sides of the surface to be changed when the width or height of the flow path is changed.

Further, the exhaust gas flow regulator according to embodiments of the present invention occupies only a portion of the cross-sectional area of the air duct flow path, thereby having the effect of reducing the resistance to exhaust gases flowing through the center of the air duct flow path. Specifically, since the exhaust gas flow regulator is disposed close to the surface of the flow path, the regulator only regulates the flow of exhaust gases along the surface of the flow path without providing resistance to the exhaust gases flowing through the center of the flow path, thereby having the effect of facilitating the flow of the exhaust gases flowing through the center of the flow path.

Furthermore, the exhaust gas flow regulator according to embodiments of the present invention occupies only a small portion of the cross-sectional area of the air duct flow path, thereby having the effect of reducing the number of parts required to construct the heat recovery steam generator and reducing the time required for assembly.

It should be noted that the technical terms used in this specification are used only to describe certain embodiments and are not intended to limit the invention. In addition, singular elements used herein include the plural elements unless the context is clearly stated otherwise. As used herein, the terms "module" and "unit" for components are given or used solely for ease of description and the module or unit itself is not intended to have a distinct meaning or role from each other.

In this specification, the terms "comprising" or "including", or the like should not be construed as necessarily including all of the various components or steps described herein, but rather as not including some of the components or steps, or as including additional components or steps.

Further, in describing the technology disclosed herein, specific descriptions of related prior art will be omitted if it is determined that such detailed description would obscure the essence of the technology disclosed herein.

Furthermore, it is to be understood that the accompanying drawings are intended only to facilitate understanding of the embodiments disclosed herein.

<FIG> is a diagrammatic illustration of a heat recovery steam generator (HRSG) according to an embodiment of the present invention.

<FIG> is a perspective view to illustrate an exhaust gas flow regulator included in the HRSG of <FIG>.

<FIG> and <FIG> illustrate the exhaust gas flow regulator of <FIG> in front and side views respectively.

<FIG> is a diagram illustrating exhaust gases flowing through the exhaust gas flow regulator of <FIG>.

<FIG> and <FIG> are diagrams illustrating a support plate expanding when the exhaust gas flow regulator of <FIG> is heated.

<FIG> are diagrams illustrating a flow of exhaust gases in the HRSG without and with the exhaust gas flow regulator according to an embodiment of the present invention, respectively.

Referring to <FIG>, a heat recovery steam generator (HRSG) A according to an embodiment of the present invention recovers heat of high-temperature combustion exhaust gases discharged from a gas turbine during circulation of the exhaust gases therethrough. The HRSG A includes a stack <NUM>, a heat transfer tube unit <NUM>, an air duct <NUM>, and an exhaust gas flow regulator <NUM>.

The stack <NUM> is disposed in an exhaust passage at an end of the air duct <NUM>. Specifically, the stack <NUM> may be disposed near a fifth flow path <NUM>. In this case, one or more stacks <NUM> may be disposed. Specifically, the HRSG A may include a bypass duct, which may also be provided with a stack <NUM>. The stack <NUM> is a passage through which exhaust gases generated in the HRSG A are finally discharged to the outside, and includes an upper opening in communication with the outside.

The heat transfer tube unit <NUM> is disposed below the stack <NUM>. Specifically, the heat transfer tube unit <NUM> may be disposed in a fourth flow path <NUM>. The heat of exhaust gases can be absorbed through heat transfer tubes <NUM> disposed in the heat transfer tube unit <NUM>. That is, the heat transfer tubes absorb the waste heat of the exhaust gases. The heat transfer tubes may include fin-shaped heat sinks to have high heat absorption efficiency.

In this case, the fins around the heat transfer tubes may be composed of very thin iron plates. As a result, due to an inhomogeneous flow of exhaust gases or the like, damages such as micro cracks, distortion, delamination into thin sheets, or the like may occur to the heat transfer tubes.

The air duct <NUM> includes a plurality of flow paths with different cross-sectional areas through which exhaust gases flow from a gas turbine to the stack <NUM>.

Specifically, the air duct <NUM> may include a first flow path <NUM> into which high-temperature exhaust gases from the gas turbine flows, a second flow path <NUM> extending from the first flow path <NUM> and increasing in cross-sectional area in a direction that is wider than the first flow path <NUM>, and a third flow path <NUM> extending from the second flow path <NUM> and changing in the direction of the flow path in a height direction H with respect to the second flow path <NUM>.

The exhaust gas flow regulator <NUM> may be disposed in the second flow path <NUM> and third flow path <NUM> described above.

Specifically, referring to <FIG>, the exhaust gas flow regulator <NUM> may be disposed on a front side of the second flow path <NUM> or the third flow path <NUM>. In other words, the exhaust gas flow regulator <NUM> may be disposed on the side of the corresponding flow path when the cross-sectional area of the flow path changes in the width or height direction H of the flow path, or when the direction of the flow path changes.

Referring to <FIG> and <FIG> and the like, the exhaust gas flow regulator <NUM> will be described as follows.

The exhaust gas flow regulator <NUM> includes first tubes <NUM>, a support plate <NUM>, and second tubes <NUM>.

Specifically, five first tubes <NUM> are provided so as to be spaced apart from each other in a vertical direction. As shown, the five first tubes <NUM> may be spaced apart in the vertical direction in the drawing. Exhaust gases may flow through the first tubes <NUM> homogeneously in the vertical direction with respect to the longitudinal direction of the first tubes <NUM>.

The support plate <NUM> is disposed in a direction perpendicular to the extension direction of the first tubes <NUM>. The first tubes <NUM> are formed to penetrate through the support plate <NUM>.

Specifically, referring to <FIG> and <FIG>, the support plate <NUM> is disposed in a direction perpendicular to the longitudinal direction of the first tubes <NUM>. The first tubes <NUM> penetrate through and are fixed to the support plate <NUM>. This may prevent the first tubes <NUM> from being moved or rotated due to a flow of exhaust gases.

The second tube <NUM> is disposed on at least one end of the support plate <NUM>. The second tube <NUM> is coupled to the support plate <NUM> and extends parallel to the first tubes <NUM>. That is, the first tubes <NUM> and the second tube <NUM> are disposed parallel to each other. The second tubes <NUM> may be disposed at both ends of the support plate <NUM>, respectively.

The exhaust gas flow regulator <NUM> may further include a coupling plate <NUM>. The coupling plate <NUM> may have a first end coupled to the second tube <NUM> and a second end coupled to an end of the support plate <NUM>. Accordingly, the coupling plate <NUM> may couple the support plate <NUM> and the second tube <NUM> to each other. In this case, the support plate <NUM> and the coupling plate <NUM> may be coupled by bolts <NUM>.

Here, bolt <NUM> holes are formed at both ends of the support plate <NUM> for engagement with the coupling plate <NUM>. One of the bolt <NUM> holes formed at both ends of the support plate <NUM> may be formed as a vertically extending long hole.

For example, referring to <FIG> and <FIG>, a first bolt hole 428a and a second bolt hole 428b may be formed at both ends of the support plate <NUM>. In this case, the first bolt hole 428a may not be formed as a long hole, whereas the second bolt hole 428b may be formed as a long hole extending in the vertical direction.

As high-temperature exhaust gases flow through the exhaust gas flow regulator <NUM>, the support plate <NUM> having a relatively large area may be thermally expanded. Here, since the second bolt hole 428b is formed as a long hole extending in the vertical direction, an increase in length caused by the thermal expansion of the support plate <NUM> may be absorbed by the second bolt hole 428b.

Specifically, referring to <FIG>, the support plate <NUM> prior to thermal expansion is illustrated. In <FIG>, the bolt <NUM> is inserted into the second bolt hole 428b of the support plate <NUM> so as to be disposed on the lower side of the second bolt hole 428b.

In <FIG>, the support plate <NUM> after expanded by the heat of the exhaust gases is illustrated. In <FIG>, the bolt <NUM> is inserted into the second bolt hole 428b of the support plate <NUM> so as to be disposed on the upper side of the second bolt hole 428b.

At this time, although the positions of the second tube <NUM> and the bolt <NUM> on the lower side of the support plate <NUM> in <FIG> remain unchanged, the support plate <NUM> may increase in length in the vertical direction, so that the bolt <NUM> inserted into the second bolt hole 428b can be moved toward the upper side of the second bolt hole 428b along the second bolt hole 428b.

In the exhaust gas flow regulator <NUM> according to the embodiment of the present invention, the coupling plate <NUM> coupled with the second tube <NUM> and the support plate <NUM> having a long hole extending in the vertical direction are connected to each other by bolts <NUM> such that the bolts <NUM> are movable along the long hole, which has the effect of absorbing thermal expansion of the support plate <NUM>.

The second tube <NUM> may include a guide plate <NUM> disposed such that a flow of exhaust gases flowing adjacent to the second tube <NUM> is redirected toward the first tube <NUM>.

Referring to <FIG>, the guide plate <NUM> protrudes from the second tube <NUM> at an angle toward the first tube <NUM>, and a flow of exhaust gases flowing through the second tube <NUM> and the first tubes <NUM> may be redirected by the guide plate <NUM>.

Specifically, the exhaust gases flow from one side to the other around the first tubes <NUM>. That is, the exhaust gases flow from a front side F of the exhaust gas flow regulator <NUM> to a rear side R of the exhaust gas flow regulator <NUM> with respect to the first tubes <NUM>.

Here, the guide plate <NUM> may redirect the exhaust gases flowing from one side to the other side of the first tube <NUM>.

Specifically, referring to <FIG>, a flow A of exhaust gases will be described as follows. The exhaust gases flowing from a portion close to the guide plate <NUM> are subjected to a relatively large change in flow direction by the guide plate <NUM>. Due to the large change in flow direction by the guide plate <NUM>, a change in flow direction of the exhaust gases flowing through the first tubes <NUM> adjacent to the guide plate <NUM> may also occur.

Then, as the exhaust gases flow toward the rear side R of the exhaust gas flow regulator <NUM>, due to the exhaust gas redirected by the guide plate <NUM>, the flow of exhaust gases flowing through the first tubes <NUM> may be generally formed downwardly as shown in <FIG>.

The guide plate <NUM> may be rotatably connected to the second tube <NUM> to guide the exhaust gases flowing between the second tube <NUM> and the first tube <NUM> adjacent to the second tube <NUM> to be redirected toward the first tube <NUM>.

Referring to <FIG>, exhaust gases flows from the front side F to the rear side R of the exhaust gas flow regulator <NUM>. At this time, the flowing exhaust gases may flow through the first tube <NUM>, and between the first tube <NUM> and the second tube <NUM>.

However, the guide plate <NUM> extends obliquely from the second tube <NUM> toward the first tube <NUM>. Accordingly, the exhaust gases flowing between the second tube <NUM> having the guide plate <NUM> and the first tube <NUM> disposed adjacent to the second tube <NUM> are redirected by the guide plate <NUM>.

That is, as illustrated in <FIG>, the exhaust gases flowing from the front side F to the rear side R of the exhaust gas flow regulator <NUM> may be redirected to the center of the first tube <NUM> by the guide plate <NUM>.

Meanwhile, the guide plate <NUM> may be disposed on either of the second tubes <NUM> disposed on both ends of the support plate <NUM>.

Specifically, referring to <FIG>, a first exhaust gas flow regulator 400a, a second exhaust gas flow regulator 400b, and a third exhaust gas flow regulator 400c are disposed. The first exhaust gas flow regulator 400a, second exhaust gas flow regulator 400b, and third exhaust gas flow regulator 400c have the same or similar components except for the position and angle of the second tube <NUM> at which the guide plate <NUM> is disposed.

The first exhaust gas flow regulator 400a is disposed on an inlet portion of the second flow path <NUM>, adjacent to the space between the first flow path <NUM> and the second flow path <NUM>.

The second flow path <NUM> extends from the first flow path <NUM> and is formed to be wider in the width direction W than the first flow path <NUM>. In this case, exhaust gases may flow along both sides of the second flow path <NUM> in the width direction W. Accordingly, the exhaust gas flow regulator <NUM> is arranged to regulate a flow of exhaust gases flowing adjacent to the surface of the flow path.

At this time, a guide plate <NUM> may protrude from each of the second tubes <NUM> of the first exhaust gas flow regulator 400a, the second exhaust gas flow regulator 400b, and the third exhaust gas flow regulator 400c adjacent to the surface of the air duct <NUM>. In this way, the guide plate <NUM> may be disposed to allow the exhaust gases to flow away from the surface of the air duct <NUM> forming the second flow path <NUM>. However, in the case of the third exhaust gas flow regulator 400c, no guide plate <NUM> may be provided as the need to guide the flow of exhaust gases is not as great.

The exhaust gas flow regulator <NUM> may be disposed between the first flow path <NUM> and the second flow path <NUM> so as to be disposed in the height direction H at both ends of a width extending and expanding from the first flow path <NUM> to the second flow path <NUM>. Further, the guide plate <NUM> may be disposed on the second tube <NUM>, which is disposed close to a surface forming the air duct <NUM>.

Specifically, in the first exhaust gas flow regulator 400a, the guide plate <NUM> is disposed on the second tube <NUM> disposed adjacent to the surface forming the second flow path <NUM>. The guide plate <NUM> is fixed to the second tube <NUM> so as to allow exhaust gases flowing between the second tube <NUM> and the first tube <NUM> adjacent to the second tube <NUM> to flow away from the surface forming the second flow path <NUM>.

The guide plate <NUM> may be disposed such that the flow direction of exhaust gases flowing from the first flow path <NUM> toward the second flow path <NUM> is redirected toward the first tube <NUM>. For example, referring to <FIG>, the guide plate <NUM> may be configured to allow exhaust gases flowing from the front side F to the rear side R of the exhaust gas flow regulator <NUM> to flow away from the guide plate <NUM>.

In other words, the guide plate <NUM> may be configured to allow the flow direction of the exhaust gases flowing adjacent to the surface forming the flow path to flow toward the center of the flow path.

The exhaust gas flow regulator <NUM> may be disposed between the second flow path <NUM> and the third flow path <NUM> at both ends of the direction in which the flow path redirects from the second flow path <NUM> to the third flow path <NUM>. Further, the guide plate <NUM> may be disposed to allow the exhaust gases to flow toward the center of the third flow path <NUM>.

Specifically, the second exhaust gas flow regulator 400b and the third exhaust gas flow regulator 400c are disposed on an inlet portion of the third flow path <NUM> adjacent to the space between the second flow path <NUM> and the third flow path <NUM>.

The third flow path <NUM> may be divided into a first portion <NUM> before the flow path is redirected in the height direction H and a second portion <NUM> after the flow path is redirected in the height direction H. The second exhaust gas flow regulator 400b and the third exhaust gas flow regulator 400c may be disposed in the first portion <NUM> of the third flow path <NUM>. However, if the third flow path <NUM> does not include the first portion <NUM> and the second portion <NUM>, the second exhaust gas flow regulator 400b and the third exhaust gas flow regulator 400c may be disposed on an inlet portion of the third flow path <NUM>.

The second exhaust gas flow regulator 400b may be disposed on an upper side of the third flow path <NUM> in the height direction H. Then, the guide plate <NUM> is disposed on the second tube <NUM> disposed close to the upper side of the third flow path <NUM> so that the exhaust gases flowing along the upper side of the third flow path <NUM> in the height direction H can flow downward. The exhaust gases may be redirected to flow toward the center of the flow path along the guide plate <NUM>.

The third exhaust gas flow regulator 400c may be disposed on a lower side of the third flow path <NUM> in the height direction H. Then, the guide plate <NUM> is disposed on the second tube <NUM> disposed close to the lower side of the third flow path <NUM> in the height direction H so that the exhaust gases flowing along the lower side of the third flow path <NUM> can flow upward. The exhaust gases may be redirected to flow toward the center of the flow path along the guide plate <NUM>.

As described above, the exhaust gas flow regulator <NUM> according to the embodiment of the present disclosure may be disposed along the both sides of the expanding width. Further, the exhaust gas flow regulator <NUM> may be formed to be elongated longitudinally along the both sides of the flow path when the direction of the flow path is changed.

Specifically, when extending from the first flow path <NUM> to the second flow path <NUM>, the flow path extends along the width direction W. Accordingly, the first exhaust gas flow regulator 400a is disposed in close proximity to the inner surface on both sides of the width direction W. The first exhaust gas flow regulator 400a is elongated in shape and installed vertically along the height direction H. Further, when extending from the second flow path <NUM> to the third flow path <NUM>, the flow path has an upward slope along the height direction H. Accordingly, the second exhaust gas flow regulator 400b and the third exhaust gas flow regulator 400c may be disposed on both sides of the third flow path <NUM> in the height direction H.

In accordance with the embodiment described, the exhaust gas flow regulator <NUM> is positioned on both sides close to the inner surface of the flow path where the width or height of the flow path can be adjusted. This arrangement facilitates the dispersion of exhaust gases that flow along the outer side of the flow path towards its center.

Further, the exhaust gas flow regulator <NUM> according to the embodiment of the present invention occupies only a portion of the cross-sectional area of the air duct <NUM> flow path, thereby having the effect of reducing the resistance to exhaust gases flowing through the center of the air duct <NUM> flow path. Specifically, since the exhaust gas flow regulator <NUM> is disposed close to the surface of the flow path, while maintaining a predetermined distance from the surface of the flow path, the regulator only regulates the flow of exhaust gases along the surface of the flow path without providing resistance to the exhaust gases flowing through the center of the flow path, thereby having the effect of facilitating the flow of the exhaust gases flowing through the center of the flow path.

Furthermore, the exhaust gas flow regulator <NUM> according to the embodiment of the present invention occupies only a small portion of the cross-sectional area of the air duct <NUM> flow path, thereby having the effect of reducing the number of parts required to construct the heat recovery steam generator A and reducing the time required for assembly.

The guide plate <NUM> may be rotated with respect to the second tube <NUM>. That is, the direction of the guide plate <NUM> may be redirected. Specifically, an angle defined by the straight line between the second tube <NUM> and the guide plate <NUM> and the straight line connecting the second tube <NUM> and the first tube <NUM> may be changed.

However, referring to <FIG>, even when the guide plate <NUM> is rotated with respect to the second tube <NUM>, since the guide plate <NUM> is configured to redirect the flow direction of the exhaust gases flowing from the front side F to the rear side R of the exhaust gas flow regulator <NUM>, the guide plate <NUM> is preferably disposed toward the rear side R of the exhaust gas flow regulator <NUM>, rather than toward the front side F of the exhaust gas flow regulator <NUM>, with respect to the first tubes <NUM>.

The exhaust gas flow regulator <NUM> according to the embodiment of the present invention may cover not the entire area of the flow path, but only one or both sides of the flow path formed by the air duct <NUM>. Therefore, compared to the exhaust gas flow regulator <NUM> that covers the entire area of the flow path, the size may be smaller, the number of parts may be reduced, and the portions that obstruct the flow of the exhaust gas may be eliminated.

Referring to <FIG>, the flow of exhaust gases will be illustrated for the case in which the exhaust gas flow regulator <NUM> is not disposed and the case in which the exhaust gas flow regulator <NUM> is disposed.

<FIG> illustrates the cases in which the exhaust gas flow regulator <NUM> is not disposed inside the air duct <NUM>. In these cases, it can be seen that the root mean square (RMS), which is the distribution of exhaust gases flowing through the first flow path <NUM>, the second flow path <NUM>, and the third flow path <NUM>, is about <NUM>%.

In addition, <FIG> illustrates the cases in which the exhaust gas flow regulator <NUM> is disposed inside the air duct <NUM>. Specifically, the first exhaust gas flow regulator 400a, the second exhaust gas flow regulator 400b, and the third exhaust gas flow regulator 400c described above are disposed inside the air duct <NUM>.

It can be seen that the RMS, which is the distribution of exhaust gases flowing through the first flow path <NUM>, the second flow path <NUM>, and the third flow path <NUM>, is about <NUM>%.

In other words, it can be seen that under the same conditions, the RMS is reduced by about <NUM>% in the presence of the exhaust gas flow regulator <NUM> compared to the absence of the exhaust gas flow regulator <NUM>. That is, it is evident that the distribution of the exhaust gas flow is relatively uniform.

<FIG> is a perspective view illustrating an exhaust gas flow regulator <NUM> included in the HRSG A according to another embodiment of the present invention.

The HRSG A and the exhaust gas flow regulator <NUM> according to this embodiment has the same or similar components as the exhaust gas flow regulator <NUM> described in <FIG>, except for the number and position of the guide plates <NUM> protruding from the second tube <NUM>, so a detailed description thereof will be omitted.

Referring to <FIG>, a first exhaust gas flow regulator 400a' is formed on an inlet portion of the second flow path <NUM> so as to extend along the height direction H on both sides of the width direction W of the second flow path <NUM>.

At this time, the first exhaust gas flow regulators 400a' may be disposed on both sides of the second flow path <NUM>, respectively.

In addition, a guide plate <NUM> of the second flow path <NUM> may be disposed on both of the second tubes <NUM> disposed on both sides of the support plate <NUM>. Further, the guide plates <NUM> of the exhaust gas flow regulators <NUM> may be formed in the same direction.

This allows exhaust gases flowing along the side forming the flow path to flow more toward the center of the flow path.

In addition, a second exhaust gas flow regulator 400b' and a third exhaust gas flow regulator 400c' may also be provided with guide plates <NUM> on both sides of the second tube <NUM>. This allows the exhaust gases to be guided toward the center of the second tube <NUM> even when the direction of the flow path is changed.

<FIG> is a perspective view illustrating the exhaust gas flow regulator <NUM> included in the HRSG A according to another embodiment of the present invention. <FIG> and <FIG> are diagrams illustrating a change in a flow of exhaust gases close to the surface of an air duct by an edge plate of the exhaust gas flow regulator of <FIG>.

The exhaust gas flow regulator <NUM> included in the HRSG of <FIG> has the same or similar components as the exhaust gas flow regulator <NUM> of the former embodiments, except for additional provision of an edge plate <NUM>, so a detailed description thereof will be omitted.

The second tube <NUM> of the exhaust gas flow regulator <NUM> according to the embodiment of the present disclosure may further include the edge plate <NUM> rotatably coupled to the second tube <NUM>.

Referring to <FIG>, the second tube <NUM> of the exhaust gas flow regulator <NUM> may further include, in addition to the guide plate <NUM>, an edge plate <NUM> disposed to face a wall forming the air duct <NUM>. Further, the edge plate <NUM> may be disposed between the second tube <NUM> and a surface forming the air duct <NUM> through which exhaust gas flows.

As such, the edge plate <NUM> can guide exhaust gases flowing between the wall surface forming the air duct <NUM> and the second tube <NUM> to flow between the second tube <NUM> and the first tube <NUM>.

Specifically, referring to <FIG>, when the edge plate <NUM> is not included, exhaust gases may flow fast between the wall surface forming the air duct <NUM> and the second tube <NUM>.

Turning now to <FIG>, where the second tube <NUM> further includes the edge plate <NUM>, it can be seen that a portion C of the exhaust gases flowing between the wall surface forming the air duct <NUM> and the second tube <NUM> is directed between the second tube <NUM> and the first tube <NUM>.

That is, the edge plate <NUM> disposed between the surface forming the air duct <NUM> and the second tube <NUM> can reduce an area of the flow path between the wall surface of the air duct <NUM> and the second tube <NUM>. This can reduce a flow rate of exhaust gases flowing between the wall surface of the air duct <NUM> and the second tube <NUM>. Further, the edge plate <NUM> may direct a portion of exhaust gases flowing between the wall surface of the air duct <NUM> and the second tube <NUM> to a portion between the second tube <NUM> and the first tube <NUM>. Accordingly, the exhaust gases directed between the second tube <NUM> and the first tube <NUM> may flow toward the center of the air duct <NUM>.

Claim 1:
An exhaust gas flow regulator (<NUM>) comprising:
a plurality of first tubes (<NUM>) extending in an extension direction and being spaced apart from each other in a spacing direction perpendicular to the extension direction;
a support plate (<NUM>) disposed perpendicular to the extension direction of the plurality of first tubes (<NUM>) and through which the plurality of first tubes (<NUM>) penetrates; and
a second tube (<NUM>) coupled to one end of the support plate (<NUM>) and extending parallel to the plurality of first tubes (<NUM>);
wherein the second tube (<NUM>) is provided with a guide plate (<NUM>) configured to redirect exhaust gases flowing around the second tube (<NUM>) toward the plurality of first tubes (<NUM>);
characterized in that
the guide plate (<NUM>) is rotatably connected to the second tube (<NUM>) so that a flow direction of the exhaust gases flowing between the second tube (<NUM>) and a first tube of the plurality of first tubes (<NUM>) adjacent to the second tube (<NUM>) is directed toward the first tube (<NUM>).