JP2009210095A - Fluid path structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid path structure capable of minimizing influence by a leaked fluid even when a fluid such as an exhaust gas in process of transport is leaked. <P>SOLUTION: This fluid path structure provided with the flue part 11 of a flue 10 for transporting a fluid in a sealed state, and an armoring part 12 covering the outside of the smoke path part 11 is provided with a blocking part 50 partitioning a space formed between the flue part 11 and the armoring part 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure of a fluid path for transporting a fluid such as gas or liquid.

  The fluid transported by the fluid path includes, for example, exhaust gas generated in a boiler of a power plant and denitrated, and the exhaust path is guided to the chimney with the flue sealed. That is, as shown in FIG. 13, the exhaust gas denitrated by each power generation unit of the power plant is guided to the chimney 103 through the electric dust collector 101 and the exhaust gas desulfurization device 102. The flue 110 connecting the electric dust collector 101 and the flue gas desulfurization device 102 is provided with an exhaust ventilation fan 121, and the flue 110 connecting the flue gas desulfurization device 102 and the chimney 103. Is provided with a desulfurization ventilator 122 for exhaust gas. Thus, the flue 110 carries the exhaust gas at the power plant.

  Such a flue 110 normally has a double structure as shown in FIG. That is, the flue 110 includes a flue portion 111 that conveys high-temperature exhaust gas, an exterior portion 112 that is installed so as to surround the flue portion 111, and a heat insulating portion 113. The heat insulating portion 113 is a heat insulating material provided in a space formed between the flue portion 111 and the exterior portion 112, and insulates the flue portion 111 that conveys high-temperature exhaust gas. Furthermore, as shown in FIG. 15, the expansion 120 is provided in the flue 110 at fixed intervals (for example, refer patent document 1). FIG. 15 is a diagram showing a schematic configuration of the expansion 120, and a description of a structure for supporting the exterior portion 112 of the flue 110 with respect to the flue portion 111 is omitted.

  The expansion 120 includes an expansion part 121 and an exterior part 122. The expansion unit 121 conveys the exhaust gas in a sealed state and can be expanded and contracted, and absorbs the expansion of the flue portion 111 generated by the high temperature exhaust gas. As the expansion part 121 expands and contracts, the exterior part 122 installed so as to surround the expansion part 121 has a structure that slides on the exterior part 112 of the flue 110. That is, one end of the exterior part 122 is fixed to the exterior part 112 of one flue 110, and the other end of the exterior part 122 slides on the exterior part 112 of the other flue 110. Thereby, when the expansion part 114 expands and contracts, the exterior part 122 slides on the exterior part 112 and absorbs the expansion and contraction of the expansion part 114. In FIG. 15, the description of the structure for supporting the exterior portion 122 of the expansion portion 121 with respect to the flue portion 111 is omitted, and the description for the structure for connecting the expansion portion 121 to the flue portion 111 is omitted. is doing.

In this way, the flue 110 conveys the hot exhaust gas to the chimney 103 while absorbing the expansion / contraction by the expansion 120 even if the expansion / contraction is caused by the temperature of the exhaust gas.
JP-A-5-157217

  By the way, the conventional flue 110 has the following problems. Exhaust gas flowing through the flue portion 111 may leak at a connection portion between the flue portion 111 of the flue 110 and the expansion portion 121 of the expansion 120. Since the exhaust gas contains sulfur oxide (SOx) generated when the fuel is burned in the boiler, if the exhaust gas leaks, the space between the flue portion 111 and the exterior portion 112 of the flue 110 is filled with the exhaust gas. Then, the metal exterior 112 is corroded by sulfur oxide (SOx) in the exhaust gas.

  An object of the present invention is to provide a fluid path structure that solves the above-described problems and makes it possible to minimize the influence of the leaked fluid even if the fluid being conveyed such as exhaust gas leaks. is there.

  In order to solve the above-mentioned problems, the invention of claim 1 is a fluid path structure including a transport unit that transports fluid in a sealed state, and an exterior unit that covers the outside of the transport unit. The fluid path structure includes a blocking portion that divides a space formed between the exterior portion and the exterior portion.

  According to the first aspect of the present invention, the space formed between the transport unit and the exterior unit is partitioned by the blocking unit, and the blocking unit separates the spaces from each other.

  According to a second aspect of the present invention, in the fluid path structure according to the first aspect of the present invention, the fluid path structure includes a detection unit that is installed between the blocking units and detects a leaked fluid from the transfer unit.

  According to a third aspect of the present invention, in the fluid path structure according to the second aspect, the detection unit includes a detection hole formed in the exterior portion, and a detection unit that detects leaked fluid flowing through the detection hole. It is characterized by.

  According to a fourth aspect of the present invention, in the fluid path structure according to the third aspect, the detection means is a belt-like ribbon provided inside the exterior portion and in the vicinity of the detection hole, and a leading end portion of the ribbon Is characterized in that when the leaked fluid from the transport section flows from the detection hole, the leaked fluid is discharged from the detection hole.

  According to a fifth aspect of the present invention, in the fluid path structure according to the third aspect, the detection means is a detector that detects a leaked fluid from the transfer section.

  A sixth aspect of the present invention is the fluid path structure according to any one of the first to fifth aspects, wherein the transport section includes a fluid path section for flowing a fluid and an expansion section for absorbing expansion and contraction of the fluid path section. The blocking portion is provided in a space of a connection portion between the fluid path portion and the expansion portion, which is formed between the fluid path portion and the exterior portion.

  According to the first aspect of the present invention, since the space formed by the transport unit and the exterior part is separated by the blocking part, even if fluid leaks from the transport part, the space formed by the transport part and the exterior part The blocking part can prevent the leaked fluid from diffusing. Thereby, the influence which the leakage fluid has on an exterior part can be minimized.

  According to invention of Claim 2 and Claim 3, the leaking fluid from a conveyance part and the leaking fluid discharged | emitted from a detection hole can be detected by a detection part. According to the invention of claim 4, since the ribbon is discharged from the detection hole when the fluid from the transport section leaks, the leak of the fluid from the transport section is notified visually with a simple structure. Can do. Furthermore, according to the invention of claim 5, since the detector for detecting the fluid is provided, it is possible to accurately detect the presence or absence of leakage from the transport unit.

  According to the invention of claim 6, since the double-structured space formed by the fluid passage portion and the exterior portion is divided by the blocking portions at the portions located on both sides of the expansion portion, the connection between the expansion portion and the fluid passage portion. It is possible to stop the influence of the fluid leakage generated in the part only in the expansion part and minimize this influence.

  Next, an embodiment of the present invention will be described using a flue provided in a power generation unit of a power plant as an example.

(Embodiment 1)
A fluid passage structure according to this embodiment is shown in FIGS. The fluid path structure includes a double-structured flue 10 and an expansion 20. The flue 10 includes a flue portion 11 that conveys high-temperature exhaust gas generated in the power generation unit in a sealed state, a metal exterior portion 12 that is installed so as to surround the flue portion 11, and a heat insulating portion 13. I have. In addition, the heat insulation part 13 is abbreviate | omitted in FIG. FIG. 2 shows a schematic configuration of the flue 10 and the expansion 20. The heat insulating portion 13 is provided in a space formed by a double structure of the flue portion 11 and the exterior portion 12. Since high-temperature exhaust gas flows on the inner wall surface 11 </ b> A side of the flue portion 11, the heat insulating portion 13 insulates the flue portion 11. The flue portion 11 is made of, for example, a fire-resistant metal coated with a corrosion-resistant material. When the power generation unit is stopped, the flue section 11 is contracted, and when the power generation unit is in operation, the flue section 11 is expanded. In order to absorb such expansion and contraction of the flue section 11, expansions 20 are provided in the flue section 11 at regular intervals.

  The expansion 20 can freely expand and contract, and absorbs the contraction of the flue portion 111 caused by high-temperature exhaust gas. The expansion 20 includes an expansion part 21 and a metal exterior part 22. A space S is formed between the expansion portion 21 and the exterior portion 22. The expansion unit 21 has a laminated structure of fire-resistant fibers and Teflon (registered trademark), and can convey and expand and contract exhaust gas in a sealed state. Since the expansion portion 21 moves in a relatively free direction, in order to limit the movement of the expansion portion 21 in the longitudinal direction of the flue portion 11, a guide portion 30 is installed in the space S as shown in FIG. Yes.

  The guide unit 30 includes metal rod-like support portions 31 and 32 and a metal rod-like support groove portion 33. One end of the support portions 31 and 32 is fixed to the outer wall surface 11B of the flue portion 11, and the other end portion of the support portion 32 and one end portion of the bridge groove portion 33 are fixed by welding or the like. At this time, the bridge groove portion 33 is fixed to the support portion 32 so as to be in the longitudinal direction of the flue portion 11. The other end portion of the support portion 31 and the other end portion of the groove portion 33 have a sliding movement structure (hereinafter referred to as “sliding structure”) in which the support portion 31 moves along the longitudinal direction of the groove portion 33. Yes. For this purpose, as shown in FIG. 4, a slot 33 </ b> A is formed in the longitudinal direction of the flue portion 11, that is, in the longitudinal direction of the overhead groove portion 33, and the guide bolt 31 </ b> A is fixed to the support portion 31. It is fixed by 31B. The guide bolt 31A of the support portion 31 is inserted into the elongated hole 33A of the bridge groove portion 33 to form a sliding structure.

  At least one guide unit 30 or at least one set disposed symmetrically around the expansion unit 21 is disposed. The expansion 20 including the guide portion 30 can absorb the movement of the flue portion 11 in the contraction direction M2, as shown in FIG.

  The exterior part 12 of the flue 10 is held so as to be movable with respect to the flue part 11 as follows. That is, as shown in FIG. 6, the exterior portion 12 is held by the flue portion 11 by the holder 41. As shown in FIG. 7, the holder 41 includes a mounting bolt 41 </ b> A, one end of which is fixed to the outer wall surface 11 </ b> B of the flue portion 11, and a nut 41 </ b> B that fits into a screw provided at the tip of the mounting bolt 41 </ b> A. It has. In addition, a long slot 12 </ b> A is formed in the exterior portion 12 along the longitudinal direction of the flue portion 11. And the front-end | tip part of 41 A of mounting bolts is inserted in the long hole 12A of the exterior part 12, and it stops with the double nut by two nuts 41B, and the flue part 11 is fixed with respect to the exterior part 12 so that a movement is possible. Yes.

  Similarly, the exterior portion 22 of the expansion 20 is held by the bridge groove portion 33 by the holder 41 so as to be movable with respect to the bridge groove portion 33 of the guide portion 30. In addition, the exterior part 22 is held movably with respect to the exterior part 12 of the flue 10 as follows. That is, as shown in FIG. 8, the exterior part 22 is connected to the exterior part 12 by the connector 42. The connecting tool 42 includes a connecting bolt 42A and a nut 42B that fits into a screw between one end and the other end of the connecting bolt 42A. Further, a long slot 12B is opened in the exterior portion 12 along the longitudinal direction of the flue section 11, and a slot 22A is also opened in the exterior portion 22 in the same manner. Then, the connecting bolt 42A is inserted into the elongated hole 12B of the exterior portion 12 and the elongated hole 22A of the exterior portion 22, and both end portions of the coupling bolt 42A are respectively secured with double nuts by two nuts 42B. Is fixed to the exterior portion 12 so as to be slidable. That is, a sliding structure is formed by the exterior portion 22 and the exterior portion 12.

  Furthermore, the expansion part 21 of the expansion 20 is fixed to the flue part 11 of the flue 10 as follows. That is, a fixture 43 as shown in FIG. 8 is used. The fixture 43 includes a bolt 43A, a nut 43B that fits into the bolt 43A, and an auxiliary plate 43C. In addition, through holes are formed in the flue portion 11, the expansion portion 21, and the auxiliary plate 43C. Then, a bolt 43A is inserted into each through hole, the bolt 43A is stopped by a nut 43B, and the expansion portion 21 is fixed to the flue portion 11 with an auxiliary plate 43C interposed. Normally, exhaust gas flowing through the flue portion 11 does not leak from the connection portion between the expansion portion 21 and the flue portion 11, but if looseness or the like occurs in the fixture 43, the exhaust gas may leak.

  In preparation for such exhaust gas leakage, in this embodiment, a blocking unit 50 is provided for the double-structured flue 10, and a detection unit 60 is provided for the expansion 20. First, the blocking unit 50 will be described. The blocking part 50 is provided in the opening W formed in the connection part between the flue 10 and the expansion 20. The blocking unit 50 includes a plate-shaped blocking plate 51. The blocking plate 51 separates the two spaces by dividing the space formed between the flue portion 11 and the exterior portion 12 and the space S formed in the expansion 20.

  The shielding plate 51 is made based on a material such as Teflon (registered trademark) having heat resistance. One end of the blocking plate 51 is attached to the end portion of the exterior portion 12 by a sealing material 52 such as silicon, and the other end is similarly fixed to the flue portion 11 by a sealing material 53 such as silicon. And when the flue part 11 expand | swells by driving | operation of an electric power generation unit, as shown in FIG. 9, the shielding board 51 inclines with the elasticity which the sealing materials 52 and 53 have, and absorbs the expansion | swelling of the flue part 11. As shown in FIG. At this time, since the sealing materials 52 and 53 are only deformed by the expansion of the flue portion 11, the blocking portion 50 closes the opening W, that is, formed between the flue portion 11 and the exterior portion 12. There is no change in the state in which the space formed is separated from the space S formed in the expansion 20. That is, the space in which the heat insulating portion 13 is provided is always separated from the space in which the expansion portion 21 is provided.

  Next, the detection unit 60 will be described. The detection unit 60 is for detecting the leaked gas when the exhaust gas leaks from a connection part between the expansion unit 21 and the flue unit 11 or the like. As shown in FIG. 8, the detection unit 60 includes a detection hole 61, a ribbon 62, and a cylindrical part 63. The detection hole 61 is opened in the exterior portion 22 of the expansion 20 facing the ground surface side. A cylindrical cylindrical portion 63 is attached to the ground surface side of the detection hole 61. The detection hole 61 is a hole for flowing the leaked gas when the exhaust gas leaks, and the cylindrical part 63 is for flowing the leaked gas toward the ground surface side. That is, when the exhaust gas leaks, as shown in FIG. 10A, a gas flow GF due to the leaked gas that flows out from the detection hole 61 through the cylindrical portion 63 is generated.

  The ribbon 62 of the detection unit 60 is for visually informing the leakage of exhaust gas. One end of the belt-like ribbon 62 is fixed to the inside of the exterior portion 22 of the expansion 20. In FIG. 8, one end of the ribbon 62 is fixed to the tip of the exterior portion 12 of the flue 10. One end of the ribbon 62 is fixed so that the ribbon 62 passes over the detection hole 61 when the fixed ribbon 62 is stretched. Usually, the ribbon 62 is stored inside the exterior portion 22. When the exhaust gas leaks, as shown in FIG. 10B, the ribbon 62 is discharged to the outside of the exterior portion 22 by the gas flow GF of the leaked gas to visually notify the leakage of the exhaust gas. At the same time, the detection hole 61 discharges the leaked gas into the atmosphere. As described above, since the leakage of the exhaust gas is notified by the discharge of the ribbon 62, the ribbon 62 may be colored in a conspicuous color. Instead of the ribbon 62, for example, a windmill rotating with the gas flow GF of the leaking gas may be provided at the tip of the cylindrical portion 63.

  Since such a detection unit 60 visually informs the leakage of exhaust gas, it is optimal to provide the detection unit 60 on the ground surface side of the expansion 20 so that the person in charge can easily see. Further, by providing the detection unit 60 on the ground surface side, even when the leaked gas becomes liquid, the liquid leaked gas is discharged from the detection hole 61.

  According to the fluid passage structure having such a configuration, even if exhaust gas leaks from the connection portion between the expansion portion 21 and the flue portion 11, it leaks into the space formed by the exterior portion 12 and the flue portion 11 by the blocking portion 50. Since the gas is prevented from flowing and diffusing, the influence of the leaked gas is limited only to the exterior portion 22 of the expansion 20 and can be prevented from affecting the exterior portion 12 of the flue 10. That is, the influence of the leaked gas can be minimized. At the same time, in the detection unit 60, the gas flow GF due to the leaked gas is generated, the ribbon 62 is discharged from the detection hole 61, and the leak of the exhaust gas can be notified visually.

  Thus, according to this embodiment, even if the exhaust gas being conveyed through the flue 10 leaks, the leaked exhaust gas only flows through the space of the expansion 20, and the leaked gas is not leaked to the exterior portion 12 of the flue 10. The influence can be prevented and the generation of exhaust gas can be visually notified. In addition, it is not necessary to make significant changes to the flue 10 or the expansion 20, thereby preventing the influence of the leaking gas and notifying the leakage of the exhaust gas.

(Embodiment 2)
In this embodiment, the detection unit 60 of the first embodiment is as follows. In this embodiment, components that are the same as or the same as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, as shown in FIG. 11, a detector 64 that detects a substance contained in exhaust gas, for example, sulfur oxide (SOx), is used instead of the ribbon 62 of the detector 60. The detector 64 includes a main body 64A, a sensor 64B, and an indicator lamp 64C. When the sensor 64B detects sulfur oxide (SOx), the sensor 64B sends a detection signal to the main body 64A. When the main body 64A receives the detection signal, the main body 64A controls the lighting of the indicator lamp 64C. Thereby, the leakage of exhaust gas can be notified. When receiving the detection signal, the main body 64A may send a signal indicating the occurrence of leakage of exhaust gas to a receiving device (not shown) wirelessly.

  The detector 64 may be a gas flow meter that detects the flow rate of exhaust gas.

  As described above, according to this embodiment, the occurrence of leakage of exhaust gas is detected using the detector 64, so that the occurrence of leakage can be accurately detected.

(Embodiment 3)
In this embodiment, instead of connecting the flue 10 through the expansion 20 of the first embodiment, the connection of the flue 10 is as follows. In this embodiment, components that are the same as or the same as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, as shown in FIG. 12, the flue section 11 is connected by a flange 11 </ b> C provided at the tip of the flue section 11. The connection of the flange 11C includes a connection using a bolt and a nut and a connection by welding.

  Such a fluid path structure is used when conveying low-temperature exhaust gas. And when exhaust gas leaks in the connection part by the flange 11C, in the same manner as in the first embodiment, the leaked gas diffuses into the space formed by the exterior part 12 and the flue part 11 to the exterior part 12 It is possible to prevent the influence. At the same time, in the detection unit 60, as in the first embodiment, the gas flow GF due to the leaked gas is generated, and the ribbon 62 is discharged from the detection hole 61 to notify the leakage of the exhaust gas.

  As mentioned above, although each embodiment of this invention has been described in detail, the specific configuration is not limited to each embodiment, and even if there is a design change or the like without departing from the gist of this invention, It is included in this invention. For example, in each embodiment, the fluid carried by the flue 10 is the exhaust gas of the power generation unit. However, the present invention uses a gas such as steam and ammonia gas used in various facilities, and a fluid such as a solution. The present invention can also be applied to a fluid path structure to be conveyed.

It is a perspective view which shows the outline of the fluid path | route structure by Embodiment 1 of this invention. It is sectional drawing which shows the II cross section of FIG. It is sectional drawing which shows a guide part. It is a perspective view which shows the sliding structure of a guide part. It is sectional drawing which shows the mode of shrinkage | contraction of a flue part. It is sectional drawing which shows the mode of holding | maintenance of an exterior part. It is sectional drawing which shows the mode of the holding | maintenance of the exterior part by a holder. It is sectional drawing which shows a mode that the opening vicinity formed by a flue part and an exterior part was expanded. It is sectional drawing which shows the mode of the interruption | blocking part when a flue part expand | swells. FIGS. 10A and 10B are diagrams for explaining leakage of exhaust gas. FIG. 10A is a diagram illustrating a gas flow caused by a leaked gas, and FIG. 10B is a diagram illustrating discharge of a ribbon caused by the gas flow. It is a figure which shows the detection part by Embodiment 2 of this invention. It is sectional drawing which shows the outline of the fluid path | route structure by Embodiment 3 of this invention. It is a figure explaining a flue. It is sectional drawing explaining the structure of a flue. It is sectional drawing which shows schematic structure of an expansion.

Explanation of symbols

10 Flue (fluid)
11 Flue section (fluid path section)
DESCRIPTION OF SYMBOLS 12 Exterior part 20 Expansion 21 Expansion part 22 Exterior part 30 Guide part 50 Blocking part 51 Blocking part 51 Blocking plate 52,53 Sealing material 60 Detection part 61 Detection hole 62 Ribbon 63 Cylindrical part

Claims (6)

In a fluid path structure comprising a transport unit that transports fluid in a sealed state and an exterior unit that covers the outside of the transport unit,
A fluid path structure comprising: a blocking portion that divides a space formed between the transfer portion and the exterior portion.   The fluid path structure according to claim 1, further comprising a detection unit that is installed between the blocking units and detects a leaked fluid from the transfer unit.   The fluid path structure according to claim 2, wherein the detection unit includes a detection hole vacated in the exterior part, and a detection unit that detects a leaked fluid flowing through the detection hole.   The detection means is a ribbon in the form of a ribbon provided inside the exterior portion and in the vicinity of the detection hole, and when the leakage fluid from the transport portion flows from the detection hole, The fluid path structure according to claim 3, wherein the fluid is discharged from the detection hole by the flow of the leaking fluid.   The fluid path structure according to claim 3, wherein the detection unit is a detector that detects a leaked fluid from the transfer unit.   The transport unit is composed of a fluid path part through which a fluid flows and an expansion part that absorbs expansion and contraction of the fluid path part, and is a space of a connection part between the fluid path part and the expansion part, the fluid path part and the The fluid path structure according to claim 1, wherein the blocking portion is provided in a space formed between the exterior portion and the exterior portion.

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