JP3303586B2 - Heat exchanger seal member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal member of a regenerative heat exchanger used for a gas turbine or the like, and more particularly, to a structure of a seal member disposed on a cross arm portion of the regenerative heat exchanger.

[0002]

2. Description of the Related Art In a gas turbine, various heat recovery plants, and the like, a rotary heat storage type heat exchanger is used as one of means for improving the thermal efficiency of a device. This rotary regenerative heat exchanger uses a rotatable solid (core) heated by a high-temperature gas as a heat medium, and stores heat by exposing the solid to high-temperature gas for a certain period of time to absorb heat. The heat energy is recovered by rotating the heat storage surface by rotating the heat storage surface later, bringing the heat storage surface into contact with the low-temperature gas for the next predetermined time, and releasing the heat stored in the solid into the low-temperature gas.

FIG. 5 shows a rotary heat storage type heat exchanger (unknown).
The outline of is shown. In the figure, reference numeral 1 denotes a cylindrical core provided with a ceramic honeycomb element having a large number of pores formed thereon. The core 1 is driven by a driving source (roller of a gas turbine) via a ring gear 1a fixed to the outer periphery of the core. Axis)
By this, it is driven to rotate around the rotation axis Z.

Reference numeral 6 denotes a high-pressure low-temperature air passage through which high-pressure low-temperature air flows to a combustor (not shown). Reference numeral 5 denotes a low-pressure high-temperature gas passage through which low-pressure high-temperature gas flows from a turbine (not shown). The high-pressure low-temperature air passage 6 and the low-pressure high-temperature gas passage 5 are connected to each other by an outer seal
The lower end surface 1 c of the core 1 is sealed by an inner seal 2.

That is, the lower surface (sliding surface) of the outer seal 3
And the upper end surface 1b of the core, the upper surface (sliding surface) of the inner seal 2 and the lower end surface 1c of the core are in sliding contact with each other.
The core 1 is rotated while the core 6 is sealed.

FIG. 3 is a plan view of the inner seal 2 as viewed from the side of the core 1 and the sliding surface. The inner seal 2
As shown in FIG. 3, two right and left semi-annular rim portions 2
2 and 22 and clips 2 on both ends of the rim portions 22 and 22
It is constituted by a rectangular plate-shaped cross arm portion 21 connected via the third and third members 23.

The cross-sectional shape of the cross arm portion 21 is configured as shown in FIG. 4. In FIG. 4, reference numeral 21a denotes a shoe (base material) made of a heat-resistant steel material. A sliding surface material (sliding material) 21b having heat resistance and abrasion resistance such as a ceramic material is coated.

Reference numeral 24 denotes a diaphragm made of a heat-resistant spring material fixed to the upper surface of the shoe 21.
The upper surface of the housing 4 is pressed against the seat surface 4a of the housing 4 by its own spring force, thereby sealing between the low-pressure gas and the high-pressure air.

[0009]

When the rotary heat storage type heat exchanger shown in FIG. 5 is used for a gas turbine, the temperature of the gas flowing through the low-pressure high-temperature gas passage 5 becomes 10 degrees.
When the temperature of the air rising to about 00 ° C. and flowing in the high-pressure low-temperature air passage 6 is near normal temperature, a temperature difference of about 900 to 1000 ° C. occurs on both sides of the cross arm portion 21 of the inner seal 2.

Further, as shown in FIG. 4, the cross arm portion 21 of the inner seal 2 has a shoe 21a made of a heat-resistant steel material coated with a surface material 21b made of a ceramic material. )
And the surface layer material 21b have significantly different coefficients of thermal expansion, and even at the same temperature, the amounts of thermal expansion are significantly different.

Therefore, due to the large temperature difference and the difference in the coefficient of thermal expansion between the base material and the surface layer material (difference in the amount of thermal expansion), the cross arm portion 21 will be in the vicinity of both ends when a certain temperature is exceeded. Large thermal deformation occurs with the core as a core, and warpage occurs in the thickness direction.

For this reason, the inner seal 2 has a low pressure from the high pressure side due to a poor seal between the core 1 and the sliding surface 21d of the cross arm 21 which is the sliding surface of the inner seal 2 with the core 1. Gas leakage to the side occurs. This gas leakage also occurs on the outer seal 3 side in the same manner as described above.

An object of the present invention is to prevent the occurrence of gas leakage due to a decrease in sealing performance between a sealing member and a core by reducing thermal deformation of a cross arm due to a difference in ambient temperature.

[0014]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by rotating around a spindle mounted on a housing.
A pillar having a large number of narrow channels that are enabled and communicate between both end faces
-Shaped core, between the semi-annular rim and the end of the rim
A cubic cross-arm portion having a cubic plate shape,
And one surface of the cross arm portion is pressed against both end surfaces of the core by a predetermined pressure.
And a sealing member to be brought into sliding contact with a force, the seal
The high pressure gas and the low pressure gas flow area are divided by members.
In the regenerative heat exchanger, the seal member of the cross arm portion is provided at both ends in the longitudinal direction , from both end surfaces thereof to the plate surface.
The slit is formed in a predetermined length in parallel.
Preferably, the sealing member of the cross arm portion is
Two-layer structure in which a sliding material is formed on the surface of a base material made of a heat material
And a slit formed in the base material
Is done. The seal member is preferably configured as an inner seal member located on the high-temperature gas side, but may be similarly applied to an outer seal member.

According to a third aspect of the present invention, the seal member is provided on a side of the cross arm facing the high-pressure gas flow path.
The thin plate for covering the slit is attached by spot welding or the like.

[0016]

When the thickness of the cross arm portion is h and the width of the plate is b, the bending rigidity is represented by I = 1/12 bh ³ . On the other hand, the bending rigidity when this plate is cut in the longitudinal direction parallel to the plate surface at a half of the plate thickness h: I ′ = 2 × (1/1
2) It is represented by b (h / 2) ³ .

Therefore, from the above relationship, I '= (1/1)
2) b × 2/8 × h ³ = (1/12) bh ³ × 1/4 =
The bending stiffness becomes 1/4 of that of the non-cut one when cut at a half of the plate thickness as described above.

That is, the cross arm portion has a bending rigidity by forming a slit parallel to the plate surface from the end surface in the thickness of the plate and separating the plate into two plates from the end surface over a predetermined length by the slit. Becomes 1/4 of the conventional one,
When thermal deformation occurs, the force required to correct the thermal deformation can be reduced to 1/4 of the conventional one.

Therefore, the thermal deformation due to the temperature difference around the cross arm is easily restored, and the flatness of the plate surface is maintained. As a result, the sealing property of the sliding surface with the core is maintained well, and the occurrence of gas leakage from the seal portion is prevented.

Further, if the slit is covered with a thin plate, it is possible to prevent the fluid on the high pressure side from leaking to the low pressure side through the slit portion. Of course, the means for lowering the bending rigidity is not limited to the slit alone, but may be a means for absorbing a thermal deformation by joining a member having elasticity at both ends thereof as compared with the sealing member body.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. However, unless otherwise specified, the dimensions, materials, shapes, relative positions, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples. It's just

FIG. 1 is an external perspective view of a cross arm portion of a seal member for a rotary regenerative heat exchanger according to an embodiment of the present invention, and FIG. 2 is an enlarged external view of an end portion of the cross arm portion.

In FIGS. 1 and 2, reference numeral 21 denotes FIGS.
Is a cross arm portion of the inner seal 2, and the inner seal 2 is configured by connecting the cross arm portion 21 and two left and right semi-annular rim portions 22, 22 with clips 23, 23.

21d is a sliding surface of the cross arm portion,
Similar to FIG. 4, it is formed of a surface material 21b made of a material having heat resistance and wear resistance such as a ceramic material. 21
Reference symbol a denotes a shoe (base material) made of a heat-resistant steel material, which is coated with the slidable surface material 21b, for example, ceramics. The base material 21a made of the heat-resistant steel is made of a mechanical alloy (a particle-dispersed high-pressure sintering alloy having a composition of Fe, Y, or Al, a heat-resistant temperature of about 1100 ° C.), or hastelloy (an alloy having a composition of Ni or Cr). Temperature 100
(Around 0 ° C.). The above configuration is the same as the conventional one.

Reference numeral 50 denotes both end surfaces 21 of the cross arm 21.
h, 21h are slits formed in parallel with the sliding surface 21d of the cross arm portion. The slit 50 is shown in FIG.
As shown in (1), a half of the plate thickness h of the cross arm portion 21 is cut by a wire saw or the like over a predetermined depth l of the cross arm portion.

A thin plate 25 made of the same kind of heat-resistant metal as the base material 21a is spot-welded on the high-pressure side surface 21f of the cross arm 21 facing the high-pressure low-temperature air passage 6 (see FIG. 5) so as to cover the slit 50. To prevent the high pressure air in the high pressure low temperature air passage 6 from leaking to the low pressure high temperature gas passage 5 (see FIG. 5) through the slit 50.

The cross arm 2 constructed as described above
During the operation of the rotary heat storage type heat exchanger for a gas turbine incorporating the inner seal 2 having the structure 1, the temperature of the gas flowing through the low-pressure high-temperature gas passage 5 (see FIG. A temperature difference of 900 to 1000 ° C. occurs on both side surfaces of the second cross arm portion 21, that is, around the side surfaces 21f and 21g shown in FIG.

Therefore, the cross arm portion 21 has a large temperature difference as described above and a thermal expansion difference between the base material (shoe 21a) and the ceramic material 21b (see FIG. 4) as the surface material (sliding material). Thermal deformation occurs around the two end surfaces 21h, 21h as a core.

However, in the embodiment according to the present invention, the slit 50 is provided inside the thickness of the cross arm portion 21 as described above, and the cross arm portion 21 extends over a predetermined length l.
Is divided into two plates, so that the bending rigidity is reduced to 1/4 of that of the conventional one having no slit 50. The reason will be described below. The base material 21a made of the heat-resistant material is made of a mechanical alloy (a particle-dispersed high-pressure sintered alloy having a composition of Fe, Y, and Al, a heat-resistant temperature of about 1100 ° C.), and hastelloy (an alloy having a composition of Ni and Cr). Ceramics are used for the sliding material that is in sliding contact with the heat exchanger.

Assuming that the thickness of the cross arm portion 21 is h and the width of the plate is b, the bending rigidity is represented by I = (1/12) bh ³ . On the other hand, the bending rigidity when this plate is cut in a longitudinal direction parallel to the plate surface at a half of the plate thickness h: I ′ = 2 ×
It is represented by (1/12) b (h / 2) ³ .

Therefore, from the above relationship, the bending stiffness I 'is as follows.

I '= (1/12) b × 2/2 ³ × h ³ = (1 /
12) bh ³ × 1/4 = (1/4) I

That is, as described above, when the slit 50 is formed by cutting at a half of the plate thickness h of the cross arm portion 21, the bending rigidity I 'becomes 1/4 that of the conventional one in which the slit is not formed. Become.

Accordingly, as described above, the cross arm 2
In the case where the thermal deformation occurs in 1, the force required to correct the thermal deformation is 1/4 of the conventional one, which is much smaller.

As a result, the thermal deformation due to the temperature difference between both sides of the cross arm 21, that is, the high-pressure side 21f on the high-pressure low-temperature air passage 6 side and the low-pressure side 21g on the low-pressure high-temperature gas passage 5 side can be easily restored. The sliding surface 21d
In addition, the flatness of the upper surface 21e on the opposite side is maintained, and the sealing property of the sliding contact portion between the cross arm 21 and the core 1 is well maintained.

Since the thin plate 25 is attached to the high-pressure side surface 21f to cover the slit 50, high-pressure air is
Leakage to the low pressure side through
Good sealability is maintained.

In the above embodiment, the cross arm portion for the inner seal 2 has been described, but the cross arm portion for the outer seal 3 may have exactly the same configuration.

[0038]

According to the present invention, a slit is formed in the thickness of the cross arm portion forming the seal member from both end surfaces to a predetermined depth in parallel with the plate surface. The arm part is divided into two plates over a certain length from the end face, and the bending rigidity is 1/4 that of the conventional one.
When thermal deformation occurs, the force required to correct the thermal deformation is significantly reduced to about one-fourth of the conventional one.

Therefore, the thermal deformation due to the temperature difference around the cross arm is easily restored, and the flatness of the plate surface is maintained. As a result, the sealing performance of the sliding surface with the core is maintained well, and the occurrence of gas leakage from the sealing portion can be prevented.

Further, according to the present invention, since the thin plate is attached to the high-pressure side surface to cover the slit, high-pressure air is prevented from leaking to the low-pressure side through the slit, and a good seal is formed as described above. Sex is maintained.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a cross arm of a seal member for a rotary heat storage type heat exchanger according to an embodiment of the present invention.

FIG. 2 (A) is an enlarged perspective view of both ends of the cross arm, and FIG. 2 (B) is a central longitudinal sectional view thereof.

FIG. 3 is a bottom view of the inner seal for a heat exchanger.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a configuration diagram of a rotary heat storage type heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core 2 Inner seal 3 Outer seal 4 Housing 21 Cross arm 21a Base material 21b Sliding material 21f High-pressure side surface 21g Low-pressure side surface 21h End surface 25 Thin plate 50 Slit

Claims (3)

(57) [Claims] 1. A column-shaped core rotatable around a support shaft attached to a housing and having a plurality of narrow channels communicating between both end surfaces, a semi-annular rim portion, and an end portion of the rim portion. A sealing member having a rectangular plate-shaped cross arm portion provided and having one surface of the rim portion and the cross arm portion slidably contacting both end surfaces of the core with a predetermined pressure; And a regenerative heat exchanger configured by partitioning a flow path region of the low-pressure gas, at both ends in the longitudinal direction of the seal member of the cross arm portion ,
Slits are formed from both end surfaces in parallel to the plate surface for a predetermined length.
Sealing member of the heat exchanger characterized by comprising been. 2. A sealing member of the crossarm portion, resistance
Two-layer structure in which a sliding material is formed on the surface of a base material made of a heat material
The seal member for a heat exchanger according to claim 1 , wherein a slit is formed in the base material . 3. The sealing member according to claim 1, wherein said sealing member has a height of a cross arm portion.
A thin plate that covers the slit on the side facing the pressure gas flow path
The seal member for a heat exchanger according to claim 1 , wherein the seal member is attached by spot welding or the like .