JP2002364993A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger in which blow through or leakage of combustion gas can be suppressed effectively. SOLUTION: The heat exchanger comprises a heat exchanger body 2 where a plurality of channel forming bodies 1 are arranged through a gap to pass air A, a casing 3 surrounding the heat exchanger body 2 in the circumferential direction to pass combustion gas B, and offset type heat transfer fins 11 arranged between respective channel forming bodies 1. A vertical wall 25 extending in the conducting direction of the combustion gas B is provided closely to the casing 3 of each heat transfer fin 11 and tightly to the channel forming bodies 1 in order to suppress leakage of the combustion gas B from the heat transfer fin 11 to the casing 3 side. The gap between the edge parts of the channel forming body 1 close to the casing 3 is filled with a sealing material 23 and then a seal plate 24 is provided on the inner side face of the casing 3 over the entire circumference thereof to touch the heat exchanger body 2 and the sealing material 23 thus closing the air gap between the heat exchanger body 2 and the casing 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger.

[0002]

2. Description of the Related Art FIGS. 3 to 6 show an example of a conventional plate-fin type heat exchanger. This heat exchanger includes a plurality of flow path forming members 1 through which air A to be preheated can flow. The heat exchanger includes a heat exchanger body 2 arranged with a gap therebetween, and a casing 3 surrounding the heat exchanger body 2 in a circumferential direction and through which combustion gas B can flow.

[0003] The flow path forming body 1 comprises a pair of partition plates 4 which are substantially perpendicular to each other and are joined to each other along the entire periphery of the partition plates.
And heat transfer fins 5 interposed therebetween and guiding the flow of the air A in the vertical direction.

The partition plate 4 has a substantially hexagonal shape when viewed from the front, and has a portion near the upper end in a plate thickness direction (the flow path forming member 1).
An air inflow hole 6 penetrating in the same direction is arranged, and an air outflow hole 7 penetrating in the same direction is formed in a portion near the lower end (but located at the rearmost end of the heat exchanger body 2). The air inlet 6 and the air outlet 7 are not formed in the partition plate 4 on the rear side of the flow path forming body 1).

[0005] Further, in the middle part of the partition plate 4 in the vertical direction,
A support 8 protruding left and right is formed.

In addition to this, between the adjacent flow path forming members 1, the two flow path forming members 1 are in close contact with the peripheral portion of the air inlet hole 6.
Upper seal ring 9 that communicates the upper part of the inside with each other
And a lower seal ring 10 which is in close contact with the peripheral edge of the air outflow hole 7 and communicates with the lower end portions in both flow path forming bodies 1.
And heat transfer fins 11 that are in contact with both of the flow path forming bodies 1 and guide the flow of the combustion gas B in the vertical direction.

Further, an air inlet hole 6 is formed in the partition plate 4 on the front side of the flow path forming body 1 located at the foremost end of the heat exchanger body 2.
An air inlet pipe 12 connected to the peripheral edge of the air outlet hole 7 and an air outlet pipe 13 connected to the peripheral edge of the air outlet hole 7 are provided.

The heat transfer fins 5 form a mixed flow portion 14 for diffusing the air A supplied from the air inflow hole 6 into the flow path forming body 1 downward, and the air A passing through the mixed flow portion 14 in parallel. A counterflow part 15 for guiding the air and a diagonal flow part 16 for converging the air A passing through the countercurrent part 15 toward the air outflow hole 7 are formed.

The heat transfer fins 11 include a diagonal flow portion 17 for converging the combustion gas B supplied from below the heat exchanger main body 2 to the space between the flow path forming members 1 upward, and a combustion gas passing through the diagonal flow portion 17. A counterflow portion 18 for guiding B in parallel and a diagonal flow portion 19 for diffusing the combustion gas B passing through the countercurrent portion 18 upward are formed.

[0010] The counter-current parts 15, 15 of these heat transfer fins 5, 11
18 uses an offset type heat transfer fin to improve the heat transfer performance.

The casing 3 surrounds the front, rear, left and right of the heat exchanger body 2 and is reinforced by the frame 20.
1 and a load receiving member 22 fixed to the left and right inner side surfaces of the flow path wall 21 and on which the support portions 8 of the flow path forming bodies 1 are placed.

The lower end of the casing 3 is connected to an exhaust pipe of a gas turbine engine (not shown), and the upper end of the casing 3 is open to the atmosphere.

Further, the above-described air inlet pipe 12 is connected to a discharge port of an air compressor (not shown), and the air outlet pipe 13 is provided with a gas generator (not shown) attached to a gas turbine engine. ) Is connected to the combustion chamber.

In the heat exchangers shown in FIGS. 3 to 6, the combustion gas B after driving the gas turbine engine is supplied from the lower end of the casing 3 to between the flow path forming members 1. The diagonal flow section 17, the countercurrent section 18, and the diagonal flow section 19 flow in this order.

The air A discharged from the air compressor
Is supplied into the flow path forming body 1 through the air inlet pipe 12 and the air inlet hole 6 of the partition plate 4, and the mixed flow portion 14, the countercurrent portion 15, and the mixed flow portion in the flow path formed body 1 16 in order.

At this time, the heat of the combustion gas B is transmitted to the air A by the heat transfer fins 11, the partition plate 4, and the heat transfer fins 5.

Further, the heated air A is sent to the combustion chamber of the gas generator via the air outlet hole 7 of the partition plate 4 and the air outlet pipe 13, and the combustion gas B after heat recovery is supplied to the casing. 3 to the atmosphere via the upper end.

[0018]

However, in the conventional heat exchangers shown in FIGS. 3 to 6, a part of the combustion gas B flowing into the lower end of the casing 3 causes heat transfer between the flow path forming members 1. The air gap between the flow path forming body 1 and the casing 3 having a smaller flow resistance than the place where the fins 11 are installed is blown through, or the flow path forming body 1 and the casing 3 The combustion gas B leaks into the gap between the combustion gas B and the heat recovery from the combustion gas B cannot be performed efficiently.

Even if the above-mentioned space is filled with a heat-resistant sealing material, the sealing material may be deformed due to a difference in thermal expansion between the flow path wall 21 of the casing 3 and the partition plate 4 of the flow path forming body 1. It is damaged and falls off, and it becomes impossible to suppress blow-through of the combustion gas B.

The present invention has been made in view of the above circumstances, and has as its object to provide a heat exchanger capable of effectively suppressing blow-by of combustion gas.

[0021]

In order to achieve the above object, in the heat exchanger according to the first aspect of the present invention, a plurality of flow path forming bodies through which air to be preheated can flow are separated by a gap. Heat exchanger body, a casing surrounding the heat exchanger body in the circumferential direction and through which the combustion gas can flow, and an offset heat transfer disposed between the flow path forming members and guiding the combustion gas. Fins are provided on the heat transfer fin near the casing, and a vertical wall extending over the entire length of the heat transfer fin in the combustion gas flow direction and in close contact with both of the adjacent flow path forming bodies is provided. A seal material is filled between the parts, and a seal plate extending in a direction intersecting the combustion gas flow direction and in contact with the seal material and the heat exchanger body is provided around the entire inner surface of the casing.

In the heat exchanger according to claim 2 of the present invention,
In addition to the configuration of the heat exchanger according to claim 1 of the present invention, straight heat transfer fins are applied to the vertical passage wall.

In the heat exchanger according to the third aspect of the present invention,
In addition to the configuration of the heat exchanger according to claim 1 or 2 of the present invention, the cross-sectional shape of the seal plate is set so as to be in contact with the heat exchanger body and the seal material in an arc shape from the inner surface of the casing. I have.

In any one of the heat exchangers according to the first to third aspects of the present invention, the flow passage extends from the heat transfer fins by the vertical wall extending in the combustion gas flow direction and closely contacting the flow path forming body. In addition to suppressing the leakage of the combustion gas into the gap between the forming body and the casing, the casing is formed by a sealing material filled between the casing-side edges of the flow path forming body and a seal plate provided on the entire inner surface of the casing. The gap between the heat exchanger body and the heat exchanger body.

In the heat exchanger according to the second aspect of the present invention, the straight type heat transfer fin is applied to the vertical passage wall,
Improve heat recovery efficiency while suppressing combustion gas leakage.

In the heat exchanger according to a third aspect of the present invention, the shape of the seal plate is set so that the seal plate comes into contact with the heat exchanger body from the inner surface of the casing in an arc shape, and the heat of the casing and the flow path forming body is formed. The gap between the casing and the heat exchanger body is closed while avoiding the influence of the difference in elongation.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of a heat exchanger according to the present invention. In the drawings, the portions denoted by the same reference numerals as those in FIGS. 3 to 6 represent the same components.

In this heat exchanger, a straight portion which extends over the entire length of the heat transfer fin 11 in the flow direction of the combustion gas B and can be in close contact with each partition plate 4 of the adjacent flow path forming body 1 is provided at the portion near the flow path wall 21. The mold heat transfer fin is provided as a vertical passage wall 25, and the vertical passage wall 25 is fixed to the partition plate 4 by brazing.

The vertical wall 25 does not necessarily have to be integrally connected to the heat transfer fins 11, but is formed in a portion of the heat transfer fin 11 near the flow path wall 21 where the vertical wall 25 is adjacent. The vertical passage wall 25 may be a member different from the heat transfer fins 11 as long as it has a shape that closely contacts the partition plates 4 of the body 1.

In addition, when the vertical passage wall 25 is a straight type heat transfer fin, the number thereof may be appropriately increased.

A seal member 23 made of a material having excellent heat resistance, such as ceramics, is provided between the edges of the flow path forming body 1 near the flow path wall 21 so as to be positioned above the support section 8. Is filling.

The sealing material 23 has a solid form after filling, so that the combustion gas B can be prevented from being blown through between the support portions 8 of the adjacent flow path forming members 1 or A dense mass of fibrous material is used.

Further, a metal seal plate 24 extending substantially horizontally is attached to the left and right edges of each of the flow path forming bodies 1 and the sealing material 2.
3. Casing so that the partition plate 4 on the front side of the flow path forming body 1 at the front end of the heat exchanger body 2 and the partition wall 4 on the rear side of the flow path forming body 1 at the rear end of the heat exchanger body 2 The third channel wall 21 is provided over the entire inner surface.

The cross section of the seal plate 24 is
The heat exchanger main body 2 is set in a substantially J-shape so as to contact the heat exchanger body 2 in an arc shape from the inner side.

That is, in the heat exchanger shown in FIGS. 1 and 2, the heat transfer fins are formed by the vertical passage walls 25 which extend in the flow direction of the combustion gas B and are brought into close contact with the partition plates 4 of the adjacent flow path forming body 1. A sealing material 23 filled between the edges of the flow path forming body 1 to prevent the combustion gas B from leaking from the flow path forming body 11 into a gap between the flow path forming body 1 and the inner surface of the flow path wall 21; Since the gap between the casing 3 and the heat exchanger main body 2 is closed by the seal plate 24 provided on the entire inner surface of the inner surface 21, the blow-through of the combustion gas B in the casing 3 is effectively suppressed, It is possible to improve the efficiency of heat recovery from the combustion gas B.

Further, since the cross section of the seal plate 24 is set in a J-shape so that the inner surface of the flow path wall 21 contacts the heat exchanger body 2 in an arc shape, the casing 3 and the flow path forming body 1 Even if a thermal expansion difference occurs, the gap between the casing 3 and the heat exchanger main body 2 can be reliably closed by the elastic deformation of the seal plate 24.

The heat exchanger of the present invention is not limited to the above-described embodiment. For example, the cross section of the seal plate may be set to a shape other than a substantially J-shape such as a substantially U-shape. Of course, various changes can be made without departing from the spirit of the present invention.

[0039]

As described above, according to the heat exchanger of the present invention, the following excellent effects can be obtained.

(1) In any one of the heat exchangers according to the first to third aspects of the present invention, the heat transfer fin is formed by the vertical passage wall extending in the combustion gas flow direction and closely attached to the flow path forming body. In addition to preventing leakage of the combustion gas into the gap between the flow path forming body and the casing, the sealing material is filled between the casing adjacent edges of the flow path forming body, and a seal plate provided on the entire inner surface of the casing. Thereby, the gap between the casing and the heat exchanger body is closed, so that the blow-through of the combustion gas in the casing can be effectively suppressed, and the efficiency of heat recovery from the combustion gas can be improved.

(2) In the heat exchanger according to the second aspect of the present invention, by applying straight type heat transfer fins to the vertical wall, the vertical wall can suppress the leakage of the combustion gas, and It also contributes to improving heat recovery efficiency.

(3) In the heat exchanger according to the third aspect of the present invention, the shape of the seal plate is set so as to be in contact with the heat exchanger body from the inner surface of the casing in an arc shape, so that the heat exchanger can be connected to the casing. The gap between the casing and the flow path forming body can be closed while avoiding the influence of the difference in thermal expansion of the path forming body.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an example of an embodiment of a heat exchanger of the present invention.

FIG. 2 is a cross-sectional view showing an example of an embodiment of the heat exchanger of the present invention.

FIG. 3 is a partially cut perspective view showing an example of a conventional heat exchanger.

FIG. 4 is a cross-sectional view showing an example of a conventional heat exchanger.

FIG. 5 is a partially cutaway perspective view showing a partition plate and heat transfer fins in FIG. 3;

FIG. 6 is a conceptual diagram showing flows of air and combustion gas in a conventional heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flow path forming body 2 Heat exchanger main body 3 Casing 11 Heat transfer fin 23 Seal material 24 Seal plate 25 Vertical wall A Air B Combustion gas

Claims (3)

[Claims] 1. A heat exchanger main body in which a plurality of flow path forming bodies through which air to be preheated can flow are arranged with a gap therebetween, and the heat exchanger main body surrounds the heat exchanger main body in a circumferential direction and has a combustion gas inside. A flowable casing, comprising an offset heat transfer fin disposed between each flow path forming body and guiding the combustion gas,
A vertical wall which extends over the entire length of the heat transfer fin near the casing and which is in close contact with both of the adjacent flow path forming members and extends in the combustion gas flow direction is provided, and a sealing material is provided between the casing-side edges of the flow path forming member. And a seal plate extending in a direction intersecting the combustion gas flow direction and in contact with the sealing material and the heat exchanger body is provided over the entire inner surface of the casing. 2. The heat exchanger according to claim 1, wherein straight heat transfer fins are applied to the vertical wall. 3. The heat exchanger according to claim 1, wherein a cross-sectional shape of the seal plate is set so as to contact the heat exchanger body and the seal member in an arc shape from the inner surface of the casing.