JP3488446B2 - Heat exchanger - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD 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, which has a plurality of flow passage forming bodies 1 through which air A to be preheated can flow. The heat exchanger main body 2 is arranged with a gap therebetween, and a casing 3 that surrounds the heat exchanger main body 2 in the circumferential direction and allows the combustion gas B to flow inside.

The flow path forming body 1 has a pair of partition plates 4 facing each other in a substantially vertical direction and having their edges all joined to each other, and the partition plates 4.
And heat transfer fins 5 that are interposed between the heat transfer fins 5 and guide 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 a portion near the upper end of the partition plate 4 in the plate thickness direction (the flow path forming member 1).
The air inflow hole 6 penetrating in the same direction is formed, and the air outflow hole 7 penetrating in the same direction is formed in the portion near the lower end (provided that it is located at the rearmost end of the heat exchanger body 2). No air inflow holes 6 and air outflow holes 7 are formed in the partition plate 4 on the rear side of the flow path forming body 1).

Further, in the vertical middle portion of the partition plate 4,
A support portion 8 is formed so as to project to the left and right.

In addition to this, between the flow passage forming bodies 1 adjacent to each other, both flow passage forming bodies 1 are in close contact with the peripheral portion of the air inflow hole 6.
Upper seal ring 9 that communicates with each other near the upper end inside
And a lower seal ring 10 that is in close contact with the peripheral portion of the air outflow hole 7 and communicates the portions near the lower ends in both flow path forming bodies 1 with each other.
And a heat transfer fin 11 that is in contact with both flow path forming bodies 1 and guides the flow of the combustion gas B in the vertical direction.

Further, an air inflow 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 a peripheral portion of the air outlet pipe 7 and an air outlet pipe 13 connected to a peripheral portion of the air outlet hole 7 are provided.

The heat transfer fins 5 are arranged such that the oblique flow portion 14 for diffusing the air A fed into the flow path forming body 1 from the air inflow hole 6 downward and the air A passing through the oblique flow portion 14 in parallel. The counterflow part 15 to be guided and the mixed flow part 16 for converging the air A passing through the counterflow part 15 toward the air outflow hole 7 are formed.

The heat transfer fins 11 include a mixed flow portion 17 for converging upward the combustion gas B fed from below the heat exchanger body 2 to between the flow path forming bodies 1, and the combustion gas passing through the mixed flow portion 17. A counterflow portion 18 that guides B in parallel and a mixed flow portion 19 that diffuses the combustion gas B that has passed through the counterflow portion 18 upward are formed.

The countercurrent portions 15 of these heat transfer fins 5 and 11,
Offset heat transfer fins 18 are used to improve heat transfer performance.

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

Furthermore, the above-mentioned air inlet pipe 12 is connected to the discharge port of an air compressor (not shown), and the air outlet pipe 13 is attached to a gas turbine engine (not shown). No.) 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 fed from the lower end portion of the casing 3 to between the flow passage forming members 1 and the flow passage forming members 1. The mixed flow portion 17, the counterflow portion 18, and the mixed flow portion 19 between the two flow in order.

Air A discharged from the air compressor
Is fed into the flow passage forming body 1 through the air inlet pipe 12 and the air inflow hole 6 of the partition plate 4, and the mixed flow portion 14, the counter flow portion 15, and the mixed flow portion in the flow passage forming body 1 are supplied. 16 are distributed in order.

At this time, the heat of the combustion gas B is transferred 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 fed to the combustion chamber of the gas generator through the air outflow hole 7 of the partition plate 4 and the air outlet pipe 13, and the combustion gas B after heat recovery is the casing. It is released into the atmosphere through the upper end of 3.

[0018]

However, in the conventional heat exchanger shown in FIGS. 3 to 6, a part of the combustion gas B flowing into the lower end portion of the casing 3 transfers heat between the flow passage forming bodies 1. The flow path forming body 1 and the casing 3 are blown through a gap between the flow path forming body 1 and the casing 3 having a flow path resistance smaller than that of the installation location of the fins 11, or from the countercurrent portion 18 to which the offset type heat transfer fin is applied. Since the combustion gas B leaks to the gap between the and, heat recovery from the combustion gas B cannot be performed efficiently.

Even if the above-mentioned gap is filled with a heat-resistant sealing material, the sealing material will be filled by the 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 becomes damaged and falls off, and it becomes impossible to suppress the blow-by of the combustion gas B.

The present invention has been made in view of the above situation, and an object thereof is 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 passage forming bodies, through which air to be preheated can flow, are separated by gaps. Heat exchanger main bodies arranged side by side, a casing that surrounds the heat exchanger main body in the circumferential direction and through which combustion gas can flow, and offset heat transfer that is arranged between each flow path forming body and guides the combustion gas A fin is provided, and a vertical wall that extends over the entire length in the combustion gas flow direction of the heat transfer fin and that is in close contact with both adjacent flow passage forming bodies is provided in the portion near the casing of the heat transfer fins. A seal plate is filled between the parts, extends in a direction intersecting with the combustion gas flow direction, and is in contact with the seal member and the heat exchanger body, and the seal plate is provided all around the inner surface of the casing.

In the heat exchanger according to claim 2 of the present invention,
In addition to the structure of the heat exchanger according to claim 1 of the present invention, straight type heat transfer fins are applied to the longitudinal walls.

In the heat exchanger according to claim 3 of the present invention,
In addition to the structure of the heat exchanger according to claim 1 or 2, the seal plate has a cross-sectional shape set so as to contact the heat exchanger body and the seal member in an arc shape from the inner surface of the casing. There is.

In any of the heat exchangers according to the first to third aspects of the present invention, the heat transfer fins are connected to the flow passages by the longitudinal wall extending in the combustion gas flow direction and being in close contact with the flow passage forming body. The leakage of combustion gas to the gap between the forming body and the casing is suppressed, and the casing is provided by the sealing material filled between the casing-side edges of the flow passage forming body and the seal plate provided on the entire inner surface of the casing. The gap between the heat exchanger body and the heat exchanger body is closed.

In the heat exchanger according to claim 2 of the present invention, the straight type heat transfer fins are applied to the longitudinal wall,
While suppressing leakage of combustion gas, improve heat recovery efficiency.

In the heat exchanger according to the third aspect of the present invention, the shape of the seal plate is set so that the inner surface of the casing contacts the main body of the heat exchanger in an arc shape, and the heat of the casing and the flow passage forming body is set. The gap between the casing and the heat exchanger body is closed while avoiding the influence of the difference in elongation.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an example of an embodiment of the heat exchanger of the present invention. In the drawings, the parts designated by the same reference numerals as those in FIGS. 3 to 6 represent the same parts.

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

The vertical wall 25 does not necessarily need to be integrally connected to the heat transfer fin 11, and in the portion of the heat transfer fin 11 near the flow path wall 21, the vertical wall 25 is adjacent to the flow path formation. The vertical wall 25 may be a member different from the heat transfer fin 11 as long as it has a shape in which the partition plate 4 of the body 1 is closely attached.

In addition to this, when the vertical wall 25 is a straight type heat transfer fin, the number of threads may be appropriately increased.

In addition, a sealing material 23 made of a material having excellent heat resistance such as ceramic is placed between the edges of the flow path forming bodies 1 close to the flow path wall 21 so as to be located above the supporting portion 8. Filling.

In the sealing material 23, the form after filling is a solidified body so as to prevent the combustion gas B from passing through between the supporting portions 8 of the flow passage forming bodies 1 adjacent to each other, or , Use a dense mass of fibrous material.

Further, metal seal plates 24 extending substantially horizontally are provided on the left and right edges of each flow path forming body 1 and the sealing material 2.
3, the casing so as to contact the partition plate 4 on the front side of the flow passage forming body 1 at the frontmost end of the heat exchanger main body 2 and the partition wall plate 4 on the rear side of the flow passage forming body 1 at the rearmost end of the heat exchanger main body 2. It is provided all around the inner surface of the flow path wall 21 of No. 3.

The cross section of the seal plate 24 has a cross section of the flow path wall 21.
It is set in a substantially J-shape so that it contacts the heat exchanger body 2 in an arc shape from the inner side surface.

That is, in the heat exchangers shown in FIGS. 1 and 2, the heat transfer fins are extended by the vertical walls 25 which extend in the flow direction of the combustion gas B and are in close contact with the partition plates 4 of the adjacent flow path forming bodies 1. The sealing material 23 that suppresses the leakage of the combustion gas B from 11 to the gap between the flow path forming body 1 and the inner surface of the flow path wall 21, and fills the space between the edges of the flow path forming body 1, and the flow path wall. 21 The seal plate 24 provided on the entire circumference of the inner surface 21 closes the gap between the casing 3 and the heat exchanger body 2, so that 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.

Since the seal plate 24 has a J-shaped cross section so as to contact the heat exchanger body 2 in an arc shape from the inner surface of the flow path wall 21, the casing 3 and the flow path forming body 1 are connected to each other. Even if a difference in thermal expansion occurs, the seal plate 24 is elastically deformed, so that the gap between the casing 3 and the heat exchanger body 2 can be reliably closed.

The heat exchanger according to the present invention is not limited to the above-mentioned embodiment, and 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, other various modifications can be made without departing from the scope 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 of the heat exchangers according to any one of claims 1 to 3 of the present invention, the heat transfer fin is provided by a vertical wall extending in the combustion gas flow direction and closely attached to the flow path forming body. The leakage of combustion gas from the flow passage forming body to the gap between the casing and the sealing material filled between the edges of the passage forming body near the casing, and the seal plate provided on the entire circumference of the inner surface of the casing. As a result, the gap between the casing and the heat exchanger body is closed, so that blow-by 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 claim 2 of the present invention, by applying the straight type heat transfer fins to the vertical wall, the vertical wall suppresses the leakage of combustion gas, and It also contributes to the improvement of heat recovery efficiency.

(3) In the heat exchanger according to claim 3 of the present invention, since the shape of the seal plate is set so as to contact the heat exchanger body from the inner side surface of the casing in an arcuate shape, the heat flow with the casing is eliminated. It is possible to close the gap between the casing and the flow path forming body while avoiding the influence of the difference in thermal expansion of the path forming body.

[Brief description of drawings]

FIG. 1 is a partially cut 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.

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

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

[Explanation of symbols]

1 Flow path forming body 2 heat exchanger body 3 casing 11 heat transfer fins 23 Seal material 24 seal plate 25 vertical wall A air B Combustion gas

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-2002-122391 (JP, A) JP-A-2000-304487 (JP, A) JP-A-63-116098 (JP, A) JP-A-10-238988 ( JP, A) Actually developed 60-189783 (JP, U) Actually developed 4-122984 (JP, U) Registered utility model 3054888 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) ) F28F 9/00 F02C 7/08 F28D 1/03

Claims (3)

(57) [Claims] 1. A heat exchanger main body in which a plurality of flow path forming bodies in which air to be preheated can flow are arranged with a gap therebetween, and a combustion gas surrounds the heat exchanger main body in the circumferential direction and has a combustion gas inside. A casing that can flow, and an offset type heat transfer fin that is disposed between each flow path forming member and guides combustion gas,
A vertical wall that extends over the entire length in the combustion gas flow direction and is in close contact with both adjacent flow passage forming bodies is provided at the casing-side portion of the heat transfer fin, and the sealing material is provided between the casing-side edges of the flow passage forming body. 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 are provided all around the inner surface of the casing. 2. The heat exchanger according to claim 1, wherein straight type heat transfer fins are applied to the longitudinal walls. 3. The heat exchanger according to claim 1, wherein the 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.