JP5995814B2 - Seal member and exhaust gas catalyst device - Google Patents

Description

  The present invention relates to a seal member applied to an exhaust gas catalytic device that can be used in an exhaust heat recovery boiler and the like to remove harmful substances in exhaust gas, and more particularly, to a seal member having a denitration function used in an exhaust gas catalytic device. It is about.

  For example, a combined power generation facility is a gas turbine facility in which a combustor mixes and burns compressed air compressed by a compressor and a fuel gas, and rotates the turbine with the combustion gas to drive the generator. In the steam turbine facility, the turbine is rotated by the supplied steam to drive the generator. In this case, the exhaust heat recovery boiler recovers heat from exhaust gas discharged from the turbine to generate steam as disclosed in, for example, Patent Document 1 below, and supplies this steam to the turbine of the steam turbine equipment. doing.

  The above-described exhaust heat recovery boiler has, for example, a vertical type, in which an upper heat transfer tube group, a denitration device, and a lower heat transfer tube group are arranged in the vertical direction in the casing so that the exhaust gas passes from below to above. It is configured. The denitration apparatus is fixed on a frame supported by being suspended from a casing, for example, as disclosed in Patent Document 2 below, and a seal plate serving as a seal member between the casing and the frame Is arranged to prevent leakage of exhaust gas.

  Also, the following cited document 3 describes a seal structure for preventing a short path of exhaust gas in an exhaust heat recovery boiler. The seal member used in this seal structure has a laminated structure including a catalyst-carrying seal member and a catalyst-uncarrying seal member provided so as to cover both surfaces of the catalyst-carrying seal member. The catalyst-carrying seal member is provided with a catalyst layer carried on both surfaces of a plate material made of glass fiber. On the other hand, the catalyst-unsupported seal member is a plate material made of glass fibers that are in close contact with each other so as to cover the catalyst layers formed on both surfaces of the catalyst-supported seal member and are fixed with an adhesive.

JP-A-10-267206 JP-A-10-137549 JP 2001-235137 A

The conventional seal member described above has a problem in the method of bonding the catalyst non-carrying seal member sandwiching the catalyst carrying seal member. Specifically, there is a problem in the end joint by stitching of the catalyst non-carrying seal member. And fluctuating from the end of the catalyst unsupported seal member due to repeated pressure fluctuations in the furnace (fluctuations during start-up and operation) and the effects of thermal elongation, etc. There is a concern that it will break.
That is, if end stitching is insufficient in terms of strength, there is a possibility that fraying may occur on the yarn or suture thread at the end of the glass fiber that forms a catalyst-unsupported seal member under a load from the furnace pressure. . Also, if the end of the unsupported seal member flutters due to fluctuations in the furnace pressure, the ends of the unsupported seal member will rub against each other. It can happen.

The present invention has been made in view of such circumstances, and its object is to prevent or suppress the end of the seal member from fraying due to vibration and rubbing, and to achieve high sealing performance and durability. It is providing the sealing member provided with.
Another object of the present invention is to provide a catalyst device for exhaust gas that employs a sealing member having high sealing performance and durability and has improved reliability and durability.

In order to solve the above problems, the present invention employs the following means.
The sealing member according to the present invention includes a catalyst-carrying sealing member in which a catalyst layer is provided on both front and back sides of a plate material made of glass fiber, and a catalyst made of glass fiber that is closely adhered and fixed so as to cover the catalyst layer. An unsupported seal member, and the catalyst unsupported seal member has a size and shape larger than that of the catalyst-supported seal member, and the folded portions obtained by folding the end portions of the catalyst unsupported seal member inward are overlapped with each other. And the end of the catalyst-carrying seal member is not folded back .

According to such a seal member of the present invention, the non-catalyst-carrying seal member has a larger size and shape than the catalyst-carrying seal member, and the folded portions obtained by folding the end portions of the catalyst-uncarrying seal member inward are overlapped with each other. Since the stitched portions are stitched in a plurality of rows with heat-resistant threads over the entire circumference, end stitches having sufficient strength are made. In addition, since the stitched portions that are folded and overlapped are sewn together, flapping of the ends due to fluctuations in furnace pressure is prevented, and the ends rub against each other to heat resistant yarn and yarn at the end of the glass fiber. No fraying occurs.

  In the above invention, it is preferable that the stitched portion is stitched together at an end of the catalyst-carrying seal member, whereby the catalyst-carrying seal member is fixed to the catalyst-uncarrying seal member, and the catalyst-carrying seal member is installed. And can be prevented from being displaced during operation.

  An exhaust gas catalyst device according to the present invention includes a cylindrical casing penetrating in the vertical direction, a frame body supported by being suspended in the casing, a catalyst supported inside the frame body, The sealing member according to claim 1 or 2 interposed between an inner surface and the frame.

  According to such an exhaust gas catalyst device, since the seal member according to claim 1 or 2 is provided, the reliability and durability are improved by preventing or suppressing fraying and breakage of the seal member end. Also, the reliability and durability of the exhaust gas catalyst device equipped with the same are improved.

  According to the sealing member and the exhaust gas catalyst device of the present invention, it is possible to provide a sealing member having high sealing performance and durability by preventing or suppressing the end of the sealing member from fraying due to vibration or rubbing. . In addition, the exhaust gas catalyst device that employs a sealing member having high sealing performance and durability provides a remarkable effect that the reliability and durability of the device itself are improved.

1 is a schematic configuration diagram of a combined power generation facility to which an exhaust gas catalyst device according to an embodiment of the present invention is applied. It is a schematic block diagram of the exhaust-heat recovery boiler as a catalyst apparatus for exhaust gas of FIG. It is the schematic showing the internal structure of a waste heat recovery boiler. It is a principal part top view of the waste heat recovery boiler showing the support structure of a sealing member. It is a longitudinal cross-sectional view of the waste heat recovery boiler showing the support structure of a sealing member. It is sectional drawing of a sealing member. It is a figure which shows the edge part joining structure example of the sealing member which concerns on one Embodiment of this invention, (a) is a top view of the principal part which shows the edge part joining structure of a sealing member, (b) is a figure of Fig.7 (a). It is AA sectional drawing. FIGS. 8A and 8B are diagrams showing a modification of FIG. 7, in which FIG. 8A is a plan view of a main part showing an end joint structure of a seal member, and FIG. It is the sectional side view which showed the eyelet process of the through-hole of a sealing member.

  Exemplary embodiments of a catalyst device for exhaust gas according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

  FIG. 1 is a schematic configuration diagram of a combined power generation facility to which an exhaust gas catalyst device according to an embodiment of the present invention is applied. FIG. 2 is a schematic configuration diagram of an exhaust heat recovery boiler as an exhaust gas catalyst device of the present embodiment. 3 is a schematic view showing the internal structure of the exhaust heat recovery boiler, FIG. 4 is a plan view of the main part of the exhaust heat recovery boiler showing the support structure of the seal member, and FIG. 5 is an exhaust view showing the support structure of the seal member. FIG. 6 is a cross-sectional view of the seal member, FIG. 7A is a plan view of the main part showing the end joint structure of the seal member, and FIG. 7B is FIG. 8A is a cross-sectional view taken along the line AA of FIG. 8A, FIG. 8A is a plan view of the main part showing a modification of the end joint structure shown in FIG. 7A, and FIG. -B sectional drawing and FIG. 9 are side sectional views showing the eyelet processing of the through hole of the sealing member.

In the combined power generation facility of the present embodiment, as shown in FIG. 1, the gas turbine facility 11 includes a compressor 12, a combustor 13, and a turbine 14, and the compressor 12 and the turbine 14 are connected by a rotating shaft 15. It is connected. In the combustor 13, a compressed air supply line 16 is connected from the compressor 12, a fuel gas supply line 17 is connected, and a combustion gas supply line 18 is connected to the turbine 14.
Further, the steam turbine equipment 19 has a turbine 20 connected to the rotating shaft 15 in the gas turbine equipment 11, and a generator 21 is connected to the base end portion of the rotating shaft 15. The exhaust heat recovery boiler 22 is provided in an exhaust gas line 23 from the gas turbine equipment 11 (the turbine 14), and generates steam by exchanging heat between water and high temperature exhaust gas. Therefore, the exhaust heat recovery boiler 22 is provided with a steam supply line 24 between the steam turbine facility 19 and the turbine 20, a steam recovery line 25 is provided, and a condenser 26 is provided in the steam recovery line 25. Yes.

  Therefore, in the combustor 13, the compressed air and the fuel gas supplied from the compressor 12 are mixed and burned, and the rotating shaft 15 is rotated by the energy of the combustion gas in the turbine 14 that is supplied with the generated combustion gas. To do. Further, the turbine 20 is driven by the steam supplied from the exhaust heat recovery boiler 22 to rotate the rotating shaft 15. Thus, the generator 21 can be driven by rotating the rotating shaft 15.

  The exhaust gas from which heat has been recovered by the exhaust heat recovery boiler 22 is freed of harmful substances by the gas purification device 27, and the purified exhaust gas is discharged from the chimney 28 to the atmosphere.

  In the above-described exhaust heat recovery boiler 22, as shown in FIG. 2, a casing 31 having a rectangular tube shape is arranged along the vertical direction, and the periphery of the casing 31 is supported by a supporting steel frame 32. Inside the casing 31, a lower heat transfer tube group 33, a denitration device (catalyst) 34, and an upper heat transfer tube group 35 are disposed at predetermined intervals from below to above, and an exhaust gas line 23 is connected to the lower portion. ing. In this case, the lower heat transfer tube group 33 and the upper heat transfer tube group 35 are supported by the casing 31, and the denitration device 34 is supported by being suspended from the casing 31.

That is, as shown in FIGS. 3 to 5, the casing 31 has a cylindrical shape penetrating in the vertical direction, and the lower heat transfer tube group 33 is disposed at the lower portion, and the lower heat transfer tube 33 a constituting the lower heat transfer tube group 33. , 33 b are fixed to the casing 31 by the support member 41.
In addition, the upper heat transfer tube group 35 is disposed on the casing 31, and each side portion of the upper heat transfer tubes 35 a, 35 b, and 35 c constituting the upper heat transfer tube group 35 is fixed to the casing 31 by the support member 42. .

  In the casing 31, a denitration device 34 is disposed between the lower heat transfer tube group 33 and the upper heat transfer tube group 35. The denitration device 34 is fixed in a state where it is placed on a frame 44 that is suspended and supported by a plurality of hanging objects 43 from the upper part of the casing 31. The frame body 44 is formed so as to form a quadrangular shape by connecting the end portions of the four support columns 45, and a plurality of reinforcing members (not shown) are connected inside. The frame body 44 is set to have a smaller size than the inner size of the casing 31 so that a predetermined gap is secured between the frame body 44 and the inner wall surface of the casing 31. The denitration device 34 is placed on the upper portion of the frame body 44 so as to close the inner side of the rectangular shape formed by the four support columns 45, and is fixed by a bolt or the like (not shown).

An elastically deformable seal member 1 is interposed between the inner surface of the casing 31 and the frame body 44. As shown in detail in FIG. 6, the seal member 1 includes a catalyst-carrying seal member 2 and a catalyst-uncarrying seal member 3.
The catalyst-carrying seal member 2 is provided with catalyst layers 2b and 2c on both front and back surfaces of the first plate 2a made of glass fiber, and is in close contact with each other so as to cover the catalyst layers 2b and 2c, respectively. Supporting seal members (second plate members) 3 and 4 are fixed by an adhesive (not shown). That is, the seal member 1 of the present embodiment has a laminated structure, and the catalyst layers 2b and 2c formed on both surfaces of the catalyst-carrying seal member 2 adhere and cover the catalyst non-carrying seal members 3 and 4 made of glass fiber. It has a broken structure.

As shown in FIGS. 7A and 7B, the end portions (peripheral portions) of the catalyst-unsupported seal members 3 and 4 having a plate shape are slightly larger in size and shape than the catalyst-supported seal member 2. Yes. Such non-catalyst-carrying seal members 3 and 4 have four seals by overlapping the folded portions 3b and 4b formed by folding the end portions 3a and 4a inwardly on the outer periphery of the catalyst-carrying seal member 2. The stitched portion 5 in a state where the members are overlapped is formed. That is, the catalyst-unsupported seal members 3 and 4 are sized and shaped so that the end portions 3a and 4a are folded back to form the folded portions 3b and 4b, and the stitched portion 5 can be formed by the folded portions 3b and 4b. What is necessary is just to make it larger than the sealing member 2. FIG.
The stitching portion 5 is firmly joined by sewing four seal members over the entire circumference with the heat-resistant thread 6. In other words, the stitched portion 5 has an end stitched structure that is stitched by the heat resistant yarn 6 in two rows on the inner peripheral side and the outer peripheral side. In this embodiment, two rows are sewn with the heat-resistant yarn 6, but three rows or more may be used as necessary.

With such an end stitch structure of the seal member 1, since the stitch portion 5 is stitched by the plurality of rows of heat resistant yarns 6, high bonding strength can be obtained. As a result, as described above, the sealing member 1 installed at a predetermined position may fray from the end due to vibration or rubbing even if the pressure fluctuation in the furnace is repeated or affected by thermal elongation. Therefore, no breakage occurs.
Further, since the four seal members that overlap with the end portions 3a and 4a folded inward are all stitched, the end portions of the catalyst-unsupported seal members 3 and 4 are frayed by the influence of vibration and rubbing. Can be prevented.

That is, since the end stitching having sufficient strength is made, it is possible to prevent or suppress the fraying of the heat resistant yarn 6 and the yarn at the end portion of the glass fiber due to a load caused by the pressure in the furnace. Furthermore, since the stitching portion 5 is stitched with the end portions 3a and 4a folded inward, the end portions 3a and 4a of the catalyst-unsupported seal members 3 and 4 may fluctuate due to fluctuations in the furnace pressure. Therefore, the end portions 3a, 4a of the non-catalyst-carrying seal members 3, 4 are rubbed with each other so that the heat resistant yarn 6 and the yarn at the end portion of the glass fiber are not frayed.

  By the way, the end stitch structure of the above-described embodiment is not stitched between the catalyst-carrying seal member 2 and the catalyst-uncarrying seal members 3 and 4, for example, as shown in FIGS. 8 (a) and 8 (b). As in the modification, the end portion 2d of the catalyst-carrying seal member 2 may be sandwiched between the folded portions 3b and 4b and sewn together. By performing such co-sewing, the catalyst-carrying seal member 2 is fixed to the catalyst-carrying seal members 3 and 4, and the catalyst-carrying seal member 2 can be prevented from being displaced during installation work or operation.

In the casing 31 described above, the horizontal flange 61 is fixed by welding over the entire circumference of the inner wall surface, while the frame 44 is fixed with the mounting flange 62 having an L-shaped cross section over the entire circumference of the lower outer peripheral portion. ing. In this case, the mounting flange 62 is disposed above the horizontal flange 61, and the seal member 1 is fixed at one end to the horizontal flange 61 by a plurality of fixtures 63 and at the other end to the mounting flange 62. It is fixed by a plurality of fixtures 64.
In addition, the sealing member 1 mentioned above is attached in the state bent so that a cross section may make S shape, and a volt | bolt etc. are used for a fixture, for example.

  As shown in FIG. 5, the seal member 1 is fixed to a horizontal flange 61 provided on the casing 31 and an attachment flange 62 provided on the frame body 44 by a fixing portion 65.

  As shown in FIG. 9, the seal member 1 is formed with a through portion 68 through which a fixture 66 for fixing the seal member 1 is penetrated, and the through portion 68 covers the inner peripheral surface of the through portion 68. A metal protection member 67 through which the fixture 66 can be inserted is provided. The metal protection member 67 is, for example, an eyelet such as aluminum.

  The seal member 1 includes a first seal member 51 a interposed in a straight line portion between the casing 31 and the frame body 44 in the horizontal direction, and between a corner portion of the casing 31 and a corner portion of the frame body 44. The second seal member 51b is disposed between the end portions of the first seal member 51a adjacent to each other, and the first seal member 51a and the second seal member 51b. The member 51b is arranged without a gap.

  In the casing 31, a heat insulating material 71 is fixed to an inner wall surface where the lower heat transfer tube group 33, the denitration device 34, and the upper heat transfer tube group 35 face each other.

  Therefore, when the exhaust gas reaches the exhaust heat recovery boiler 22 through the exhaust gas line 23, heat exchange is performed when the exhaust gas passes through the lower heat transfer tube group 33, and nitrogen oxides are generated when the exhaust gas passes through the denitration device 34. It is removed and heat exchange is performed again when passing through the upper heat transfer tube group 35. At this time, the exhaust gas tends to flow also into the gap between the casing 31 and the frame body 44. However, since the seal member 1 is disposed so as to close the gap, passage of the exhaust gas through the gap is suppressed. In addition, even if it passes, the nitrogen oxides are removed by the catalyst layers 2b and 2c of the seal member 1.

  In addition, since the casing 31 is provided with the heat insulating material 71 on the inner wall surface, a difference in thermal expansion occurs between the casing 31 and the frame body 44. In this case, since the seal member 1 is elastically deformable, the thermal expansion difference generated between the casing 31 and the frame body 44 is absorbed by the seal member 1 itself deforming or expanding and contracting. In addition, no gap is generated between the casing 31 and the frame body 44, and the seal member 1 is not damaged. Furthermore, the sealing member 1 has the catalyst layers 2b and 2c peeled off because the catalyst layers 2b and 2c provided on the front and back surfaces of the first plate 2a are covered with the catalyst-unsupported sealing members 3 and 4, respectively. Nor. Further, since the protective member 67 is provided in the through portion 68 through which the fixing member 66 for fixing the seal member 1 is penetrated so as to cover the inner peripheral surface of the through portion 68, vibration and rubbing caused by thermal expansion are caused. Thus, the sealing member 1 is not damaged.

  As described above, in the exhaust gas catalyst device according to the present embodiment, the cylindrical casing 31 penetrating in the vertical direction, the frame body 44 supported by being suspended in the casing 31, and the inner side of the frame body 44 are supported. And a sealing member 1 interposed between the inner surface of the casing 31 and the frame body 44. The sealing member 1 is formed on the front and back surfaces of the catalyst-carrying sealing member 2 made of glass fiber. The catalyst layers 2b and 2c are provided, the catalyst unsupported seal member 3 made of glass fiber is provided in close contact with the catalyst layer 2b on the front surface, and the catalyst unsupported seal member 4 made of glass fiber in close contact with the catalyst layer 2c on the back surface. Is provided.

  Therefore, the seal member 1 interposed between the casing 31 and the frame body 44 is provided with catalyst layers 2b and 2c on the front and back surfaces of the catalyst-carrying seal member 2 made of glass fiber, and the catalyst layers 2b and 2c are provided with the catalyst layers 2b and 2c. The catalyst unsupported seal members 3 and 4 made of glass fibers are provided in close contact with each other, and the catalyst layers 2b and 2cb are covered with the catalyst unsupported seal members 3 and 4, so that they are directly applied to the exhaust gas. It does not come into contact with each other, and it becomes difficult to peel off against repeated deformation, so that high sealing performance can be secured and durability can be improved.

  The fixing portion 65 of the seal member 1 covers a portion where the bolt contacts the seal member 1 with a metal protection member 67. The protective member 67 is, for example, an eyelet. By applying eyelet processing to a bolt hole that is the through portion 68, the sealing member 1 made of glass fiber is damaged by rubbing or vibration between the bolt and the through portion 68. Can be prevented.

  Further, in the exhaust gas catalyst device of the present embodiment, the casing 31 has a rectangular tube shape, and the seal member 1 includes a first seal member 51a interposed in a straight portion between the casing 31 and the frame body 44, It is comprised from the 2nd seal member 51b interposed by the corner | angular part between the casing 31 and the frame 44. FIG. Therefore, when the casing 31 has a rectangular tube shape, the gap between the linear portions between the casing 31 and the frame body 44 is closed by the first seal member 51a, and the corner portion between the casing 31 and the frame body 44 is closed. Therefore, the gap between the casing 31 and the frame body 44 can be reliably sealed regardless of the shape of the casing 31.

  Further, in the exhaust gas catalytic device of the present embodiment, the horizontal flange 61 is fixed to the inner wall surface of the casing 31, the mounting flange 62 is fixed to the outer peripheral portion of the frame 44 above the horizontal flange 61, and the seal member 1 is fixed to the horizontal flange 61 and the other end is fixed to the mounting flange 62. Therefore, the gap between the casing 31 and the frame 44 can be reliably sealed by shifting the vertical positions of the mounting flange 62 and the horizontal flange 61 and interposing the seal member 1 therebetween.

  In the exhaust gas catalyst device of the present embodiment, the casing 31 is provided with a heat insulating material 71 on the inner wall surface. Therefore, the temperature reduction of the exhaust gas passing through the casing can be suppressed, and the cost can be reduced by preventing the heat insulating material 71 from being damaged.

  In the above-described embodiment, the exhaust gas catalyst device of the present invention has been described as being applied to the exhaust heat recovery boiler 22. However, a simple catalyst device having no heat exchange function may be used. Moreover, although the shape of the casing 31 is a square tube shape, it is not limited to this shape, and may be a cylindrical shape.

DESCRIPTION OF SYMBOLS 1 Seal member 2 Catalyst carrying | support seal member 2a 1st board | plate material 2b, 2c Catalyst layer 3, 4 Catalyst uncarrying seal member (2nd board | plate material)
3a, 4a End portions 3b, 4b Folded portion 5 Stitched portion 6 Heat resistant yarn 22 Waste heat recovery boiler (exhaust gas catalytic device)
31 Casing 33 Lower heat transfer tube group 34 Denitration equipment (catalyst)
35 Upper heat transfer tube group 44 Frame 51a First seal member 51b Second seal member 61 Horizontal flange 62 Mounting flange 65 Fixing portion 66 Fixing tool 67 Protection member 68 Through portion 71 Heat insulating material

Claims (3)

A catalyst-carrying sealing member in which a catalyst layer is provided on both front and back surfaces of a plate material made of glass fiber;
A catalyst-unsupported seal member made of glass fibers that are closely adhered and fixed so as to cover each of the catalyst layers,
The non-catalyst-carrying seal member has a size and shape larger than that of the catalyst-carrying seal member, and a stitched portion formed by overlapping folded portions obtained by folding the end portions of the non-catalyst-carrying seal member inward is provided over the entire circumference. A seal member characterized by being sewn into a plurality of rows with heat-resistant yarn, and an end portion of the catalyst-carrying seal member is not folded back .   The seal member according to claim 1, wherein the stitched portion is stitched together with an end portion of the catalyst-carrying seal member. A casing having a cylindrical shape penetrating in the vertical direction;
A frame that is suspended and supported in the casing;
A catalyst supported on the inside of the frame,
An exhaust gas catalyst device comprising: the sealing member according to claim 1 or 2 interposed between an inner surface of the casing and the frame.

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