WO2020054010A1 - Steam-pipe temperature measurement device, steam-pipe temperature measurement method - Google Patents

Steam-pipe temperature measurement device, steam-pipe temperature measurement method Download PDF

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Publication number
WO2020054010A1
WO2020054010A1 PCT/JP2018/033920 JP2018033920W WO2020054010A1 WO 2020054010 A1 WO2020054010 A1 WO 2020054010A1 JP 2018033920 W JP2018033920 W JP 2018033920W WO 2020054010 A1 WO2020054010 A1 WO 2020054010A1
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Prior art keywords
steam pipe
steam
cover
optical fiber
pipe
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PCT/JP2018/033920
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French (fr)
Japanese (ja)
Inventor
西田　秀高
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中国電力株式会社
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Priority to JP2018566332A priority Critical patent/JP6551621B1/en
Priority to PCT/JP2018/033920 priority patent/WO2020054010A1/en
Publication of WO2020054010A1 publication Critical patent/WO2020054010A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/38—Determining or indicating operating conditions in steam boilers, e.g. monitoring direction or rate of water flow through water tubes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres

Definitions

  • the present invention relates to a steam pipe temperature measuring device and a steam pipe temperature measuring method.
  • a steam pipe for example, a superheater or a reheater for circulating steam obtained by heat-exchanging water supplied from a condenser with combustion gas is installed.
  • the steam pipe is composed of a boiler tube containing heat-resistant steel (for example, low alloy steel) as a component.
  • heat-resistant steel for example, low alloy steel
  • the outer circumferential surface of the steam pipe will increase with the progress of creep damage.
  • the steam pipe or the thickness of the steam pipe may be reduced. Therefore, inspections are being conducted to prevent the accident caused by the deterioration of the steam pipe by grasping the combustion state of the boiler and the remaining life of the steam pipe from the measurement result of the surface temperature of the steam pipe (for example, Patent Reference 1).
  • thermocouple may be used as a means for measuring the surface temperature of a steam pipe.
  • a thermocouple when a thermocouple is used, only the surface temperature in a narrow range of the steam pipe can be measured, so that it is difficult to obtain the temperature distribution of the surface temperature of the steam pipe.
  • an object of the present invention is to provide a temperature measuring device capable of reliably measuring the surface temperature of a steam pipe over a wide range.
  • the main invention for solving the above-mentioned problem is to measure a surface temperature of a steam pipe in which steam obtained by heat-exchanging water supplied to a boiler with a combustion gas circulates as a steam pipe temperature measuring device. And a cover attached so as to surround the steam pipe with the optical fiber interposed therebetween so that the optical fiber is in close contact with the steam pipe along the longitudinal direction of the steam pipe.
  • FIG. 4 is a cross-sectional view showing a state after the temperature measuring device according to the present embodiment is mounted on a straight pipe portion of a steam pipe. It is a perspective view showing a situation before attaching other temperature measuring devices concerning this embodiment to a curved pipe part of a steam pipe.
  • FIG. 4 is a cross-sectional view showing a state after the temperature measuring device according to the present embodiment is mounted on a straight pipe portion of a steam pipe. It is a perspective view showing a situation before attaching other temperature measuring devices concerning this embodiment to a curved pipe part of a steam pipe.
  • FIG. 11 is a perspective view showing a state after another temperature measuring device according to the present embodiment is mounted on a curved pipe portion of a steam pipe. It is sectional drawing which shows the mode after attaching the other temperature measuring apparatus which concerns on this embodiment to the curved pipe part of a steam pipe.
  • FIG. 1 is a diagram illustrating an example of an overall configuration of a thermal power plant in which the steam pipe temperature measuring device according to the present embodiment is used.
  • the thermal power plant 1 includes a boiler 2, a steam generator 3, a water cooling wall 4, a steam valve 5, a high-pressure turbine 6, a medium-pressure turbine 7, a low-pressure turbine 8, a reheater 9, a condenser 10, a feedwater pump 11, and a power generator.
  • Machine 12 The thermal power plant 1 includes a boiler 2, a steam generator 3, a water cooling wall 4, a steam valve 5, a high-pressure turbine 6, a medium-pressure turbine 7, a low-pressure turbine 8, a reheater 9, a condenser 10, a feedwater pump 11, and a power generator. Machine 12.
  • the boiler 2 is a heat exchange device that mixes fuel (for example, pulverized coal) supplied from the outside with air and generates combustion gas, and uses the heat of the combustion gas to convert water into steam.
  • the boiler 2 houses a steam generator 3, a water cooling wall 4, and a reheater 9.
  • the steam generator 3 includes a economizer (not shown) that preheats water supplied from the condenser 10 and a superheater (not shown) that further heats saturated steam supplied from the water cooling wall 4 to superheated steam. ).
  • the water cooling wall 4 forms the housing of the boiler 2 and supplies the superheated water to the superheater as saturated steam.
  • the steam valve 5 is a regulating valve that controls the flow rate of superheated steam generated by the steam generator 3.
  • the rotating shafts 13 of the high-pressure turbine 6, the medium-pressure turbine 7, and the low-pressure turbine 8 are the same, and are connected to the rotating shaft 14 of the generator 12.
  • Superheated steam (first steam) generated by the steam generator 3 is supplied to the high-pressure turbine 6 via the steam valve 5.
  • the high-pressure turbine 6 expands the first steam and supplies the expanded steam (second steam) to the reheater 9 in the boiler 2.
  • the reheater 9 reheats the second steam and supplies it to the medium-pressure turbine 7 as reheated steam (third steam).
  • the medium-pressure turbine 7 expands the third steam and supplies the expanded steam (fourth steam) to the low-pressure turbine 8.
  • the low-pressure turbine 8 expands the fourth steam.
  • the condenser 10 condenses the exhaust gas after the low-pressure turbine 8 expands the fourth steam and converts the exhaust gas into condensate water.
  • the feedwater pump 11 pressurizes the condensed water generated by the condenser 10 and returns the condensed water to the steam generator 3 in the boiler 2 as feedwater.
  • the generator 12 is driven by power generated when the fourth steam expands so that electric power is generated.
  • the surface temperature of a superheater tube (steam tube) constituting the superheater included in the steam generator 3 and a reheater tube (steam tube) constituting the reheater 9 are measured by the temperature measuring device according to the present embodiment. The details will be described later. For convenience of explanation, in the following description, the superheater tube and the reheater tube will be referred to as a steam tube 15.
  • FIG. 2 is a perspective view showing a state before the temperature measuring device according to the present embodiment is mounted on a straight pipe portion of a steam pipe.
  • FIG. 3 is a perspective view showing a state after the temperature measuring device according to the present embodiment is mounted on a straight pipe portion of a steam pipe.
  • FIG. 4 is a cross-sectional view showing a state after the temperature measuring device according to the present embodiment is mounted on a straight pipe portion of a steam pipe. The temperature measuring device is mounted on the steam pipe so that the optical fiber is not exposed in the boiler.
  • the temperature measuring device 100 is made of metal (for example, SUS304, SUS316) mounted on the straight pipe portion of the steam pipe 15 via the optical fiber 110 such that the optical fiber 110 is in close contact with the surface of the straight pipe portion of the steam pipe 15.
  • the temperature measuring device 100 includes an optical fiber 110 and a cover 120.
  • the optical fiber 110 is attached by a cover 120 so as to be in close contact with the surface of the steam pipe 15 along the longitudinal direction of the steam pipe 15 in order to measure the surface temperature of the steam pipe 15.
  • the pulse light travels while slightly scattering in the optical fiber 110.
  • the Raman scattered light Stokes light and anti-Stokes light
  • the temperature of the object can be measured by detecting the Raman scattered light. That is, the surface temperature of the steam pipe 15 can be measured by bringing the optical fiber 110 into close contact with the surface of the steam pipe 15.
  • the diameter of the optical fiber 110 is, for example, about 0.2 mm. Since a temperature measuring method using the temperature dependency of Raman scattered light is well known, its description is omitted.
  • the cover 120 includes a cover main body 1201 and flanges 1202A and 1202B.
  • the thickness of the cover 120 is, for example, about 2 to 3 mm.
  • the cover body 1201 has a cylindrical shape having a diameter slightly larger than the diameter of the steam pipe 15.
  • the optical fiber 110 is accommodated along the longitudinal direction of the steam pipe 15 in order to adhere the optical fiber 110 to the surface of the steam pipe 15 along the longitudinal direction of the steam pipe 15.
  • Groove 1201C is formed.
  • the groove 1201C is formed, for example, on the opposite side of the cover body 1201 from the flanges 1202A and 1202B.
  • the groove 1201C has such a depression that the optical fiber 110 is in close contact with the surface of the steam pipe 15.
  • the cover main body 1201 has end faces 1201A and 1201B along the longitudinal direction of the steam pipe 15 so that one gap is formed along the longitudinal direction of the steam pipe 15.
  • the flanges 1202A and 1202B are formed to extend from the end surfaces 1201A and 1201B so as to be away from the steam pipe 15, respectively.
  • the flanges 1202A and 1202B have a plurality of holes 1203A and 1203B, respectively, along the longitudinal direction of the steam pipe 15.
  • the plurality of holes 1203A and 1203B communicate with each other such that the bolt 1204 is screwed with the nut 1205.
  • the bolts 1204 are inserted into the plurality of holes 1203A and 1203B to insert the bolts 1204.
  • the nut 1205 is tightened, the gap between the flanges 1202A and 1202B disappears, and the cover main body 1201 is attached in close contact with the steam pipe 15.
  • the temperature of the combustion gas is, for example, about 1200 ° C.
  • the temperature of the steam circulating in the steam pipe 15 is, for example, about 600 ° C. .
  • the optical fiber 110 does not directly contact the combustion gas with the cover 120, the temperature of the optical fiber 110 is affected only by the surface temperature of the steam pipe 15. Therefore, the temperature of the optical fiber 110 is suppressed to less than 700 ° C., and the surface temperature of the steam pipe 15 can be reliably obtained.
  • Information on the surface temperature of the steam pipe 15 is taken into an external monitoring device (not shown) via a network, and a temperature distribution is obtained. Further, since the cover 120 surrounds the steam pipe 15, the creep strength of the steam pipe 15 can be improved.
  • FIG. 5 is a perspective view showing a state before the other temperature measuring device according to the present embodiment is mounted on the curved pipe portion of the steam pipe.
  • FIG. 6 is a perspective view showing a state after another temperature measuring device according to the present embodiment is mounted on a curved pipe portion of a steam pipe.
  • FIG. 7 is a cross-sectional view showing a state after another temperature measuring device according to the present embodiment is mounted on a curved pipe portion of a steam pipe. The temperature measuring device is attached to the steam pipe so that the optical fiber is not exposed in the boiler.
  • the temperature measuring device 200 is made of metal (for example, SUS304, SUS316) mounted on the bent portion of the steam pipe 15 via the optical fiber 210 so that the optical fiber 210 is in close contact with the surface of the bent portion of the steam tube 15.
  • the temperature measuring device 200 includes an optical fiber 210 and a cover 220.
  • the optical fiber 210 is attached by the cover 220 so as to be in close contact with the surface of the steam pipe 15 along the longitudinal direction (the shape of the curved pipe portion) of the steam pipe 15 in order to measure the surface temperature of the steam pipe 15. Then, similarly to the optical fiber 110, the surface temperature of the steam pipe 15 can be measured by bringing the optical fiber 210 into close contact with the surface of the steam pipe 15 and utilizing the temperature dependency of the Raman scattered light.
  • the diameter of the optical fiber 210 is, for example, about 0.2 mm.
  • the cover 220 includes a cover body 2201 and flanges 2202A and 2202B.
  • the thickness of the cover 220 is, for example, about 2 to 3 mm.
  • the cover body 2201 has a diameter slightly larger than the diameter of the steam pipe 15 and has a cylindrical shape according to the curvature of the steam pipe 15.
  • the inner peripheral surface of the cover body 2201 is for accommodating the optical fiber 210 along the longitudinal direction of the steam pipe 15 in order to bring the optical fiber 210 into close contact with the surface of the steam pipe 15 along the longitudinal direction of the steam pipe 15.
  • Groove 2201C is formed.
  • the groove 2201C is formed on the cover body 2201, for example, on the opposite side of the flanges 2202A and 2202B.
  • the flanges 2202A and 2202B are located downstream of the combustion gas (the side where the combustion gas hits).
  • the temperature measuring device 200 is installed so as to face the opposite side.
  • the flanges 2202A and 2202B always have various shapes so as to always face the downstream side of the combustion gas. Is prepared in advance.
  • the groove 2201C has such a depression that the optical fiber 210 is in close contact with the surface of the steam pipe 15.
  • the cover body 2201 has end faces 2201A and 2201B along the longitudinal direction of the steam pipe 15 so that one gap is formed along the longitudinal direction of the steam pipe 15.
  • the flanges 2202A and 2202B are formed to extend from the end faces 2201A and 2201B so as to be away from the steam pipe 15, respectively.
  • the flanges 2202A and 2202B have a plurality of holes 2203A and 2203B, respectively, along the longitudinal direction of the steam pipe 15.
  • the plurality of holes 2203A and 2203B communicate with each other such that the bolt 2204 is screwed with the nut 2205.
  • the bolts 2204 are inserted into the plurality of holes 2203A and 2203B.
  • the gap between the flanges 2202A and 2202B disappears, and the cover main body 2201 is attached to the bent portion of the steam pipe 15 in close contact.
  • the temperature of the optical fiber 210 is affected only by the surface temperature of the steam pipe 15. Therefore, the temperature of the optical fiber 210 is suppressed to less than 700 ° C., and the surface temperature of the curved portion of the steam pipe 15 can be reliably obtained. Information on the surface temperature of the steam pipe 15 is taken into an external monitoring device (not shown) via a network, and a temperature distribution is obtained. Further, since the cover 220 surrounds the steam pipe 15, the creep strength of the steam pipe 15 can be improved.
  • the steam pipe 15 has a shape in which a straight pipe portion and a curved pipe portion are continuous. Therefore, when measuring the surface temperature of the straight pipe portion and the curved pipe portion of the steam pipe 15, the cover 120 may be attached to the straight pipe portion of the steam pipe 15, and the cover 220 may be attached to the curved pipe portion of the steam pipe 15. . Further, the cover 220 may be double mounted on the curved pipe portion of the steam pipe 15 to reinforce the curved pipe section of the steam pipe 15.
  • the temperature measuring device 100 (200) includes the steam pipe 15 (superheater pipe) in which steam obtained by heat-exchanging water supplied to the boiler 2 with combustion gas circulates. And the optical fiber 110 (210) for measuring the surface temperature of the reheater tube) and the optical fiber 110 (210) so that the optical fiber 110 (210) adheres to the steam tube 15 along the longitudinal direction of the steam tube 15. And a cover 120 (220) attached so as to surround the steam pipe 15 with the (210) interposed therebetween.
  • the optical fiber 110 (210) does not directly contact the combustion gas by the cover 120 (220), and the temperature of the optical fiber 110 (210) is affected only by the surface temperature of the steam pipe 15, The temperature of the optical fiber 110 (210) is suppressed to less than 700 ° C., and the surface temperature of the steam pipe 15 can be reliably obtained. Furthermore, since the cover 120 (220) surrounds the steam pipe 15, the creep strength of the steam pipe 15 can be improved.
  • the cover 120 (220) has a groove 1201C () that is recessed along the longitudinal direction of the steam pipe 15 so that the optical fiber 110 (210) is accommodated when the cover 120 (220) is mounted on the steam pipe 15. 2201C). According to the present embodiment, it is possible to protect the optical fiber 110 (210) while keeping the optical fiber 110 (210) in close contact with the steam pipe 15.
  • the cover 120 (220) has a gap along the longitudinal direction of the steam pipe 15 and has a cylindrical cover body 1201 (2201) surrounding the steam pipe 15, and a cover body 1201 (2201). And flanges 1202A (2202A) and 1202B (2202B) which are formed at both ends of the cover and are fastened by bolts 1204 (2204) and nuts 1205 (2205) so that the cover main body 1201 (2201) is in close contact with the steam pipe 15.
  • the cover 120 (220) is formed from an alloy steel.
  • the cover 120 (220) may be welded to the steam pipe 15 without providing the flanges 1202A (2202A) and 1202B (2202B).

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

A steam-pipe temperature measurement device according to the present invention includes: an optical fiber for measuring the temperature of the surface of a steam pipe inside which steam obtained through heat exchange between water to be supplied to a boiler and a combustion gas circulates; and a cover that is mounted so as to surround the steam pipe, with the optical fiber sandwiched therebetween, such that the optical fiber is brought into close contact with the steam pipe along the longitudinal direction of the steam pipe.

Description

蒸気管の温度測定装置、蒸気管の温度測定方法Steam pipe temperature measuring device, steam pipe temperature measuring method
　本発明は、蒸気管の温度測定装置、蒸気管の温度測定方法に関する。 The present invention relates to a steam pipe temperature measuring device and a steam pipe temperature measuring method.
　例えば、火力発電所における発電用のボイラ内には、復水器から供給される水を燃焼ガスと熱交換することによって得られる蒸気を循環させる蒸気管（例えば過熱器や再熱器）が設置されている。蒸気管は耐熱鋼（例えば低合金鋼）を成分とするボイラチューブで構成されているが、設計基準を超えた高温状態で使用され続けると、クリープ損傷の進行に伴って、蒸気管の外周面が膨張するか或いは蒸気管の肉厚が減肉する等の変形を生じる虞がある。そこで、蒸気管の表面温度の測定結果から、ボイラの燃焼状態や蒸気管の余寿命を把握することによって、蒸気管の劣化に起因する事故を未然に防止する点検が行われている（例えば特許文献１を参照）。 For example, in a boiler for power generation in a thermal power plant, a steam pipe (for example, a superheater or a reheater) for circulating steam obtained by heat-exchanging water supplied from a condenser with combustion gas is installed. Have been. The steam pipe is composed of a boiler tube containing heat-resistant steel (for example, low alloy steel) as a component. However, if the steam pipe is continuously used at a high temperature exceeding the design standards, the outer circumferential surface of the steam pipe will increase with the progress of creep damage. Of the steam pipe or the thickness of the steam pipe may be reduced. Therefore, inspections are being conducted to prevent the accident caused by the deterioration of the steam pipe by grasping the combustion state of the boiler and the remaining life of the steam pipe from the measurement result of the surface temperature of the steam pipe (for example, Patent Reference 1).
特開２０１３－１９０２２９号公報JP 2013-190229 A
　ボイラの燃焼状態や蒸気管の余寿命を把握する場合、蒸気管の表面温度を広範囲に亘って測定し、蒸気管の表面温度の温度分布を求める必要がある。 場合 When grasping the boiler combustion state and the remaining life of the steam pipe, it is necessary to measure the surface temperature of the steam pipe over a wide range and obtain the temperature distribution of the surface temperature of the steam pipe.
　例えば、蒸気管の表面温度を測定する手段として熱電対を用いる場合がある。しかし、熱電対を用いた場合、蒸気管における狭い範囲の表面温度しか測定できないため、蒸気管の表面温度の温度分布を求めることは困難である。 For example, a thermocouple may be used as a means for measuring the surface temperature of a steam pipe. However, when a thermocouple is used, only the surface temperature in a narrow range of the steam pipe can be measured, so that it is difficult to obtain the temperature distribution of the surface temperature of the steam pipe.
　そこで、本発明は、蒸気管の表面温度を広範囲に亘って確実に測定することが可能な温度測定装置を提供することを目的とする。 Therefore, an object of the present invention is to provide a temperature measuring device capable of reliably measuring the surface temperature of a steam pipe over a wide range.
　前述した課題を解決する主たる本発明は、蒸気管の温度測定装置として、ボイラに供給される水を燃焼ガスと熱交換して得られる蒸気が内部を循環する蒸気管の表面温度を測定するための光ファイバと、前記光ファイバが前記蒸気管の長手方向に沿って前記蒸気管に密着するように、前記光ファイバを挟んで前記蒸気管を取り囲むように装着されるカバーと、を備える。 SUMMARY OF THE INVENTION The main invention for solving the above-mentioned problem is to measure a surface temperature of a steam pipe in which steam obtained by heat-exchanging water supplied to a boiler with a combustion gas circulates as a steam pipe temperature measuring device. And a cover attached so as to surround the steam pipe with the optical fiber interposed therebetween so that the optical fiber is in close contact with the steam pipe along the longitudinal direction of the steam pipe.
　本発明の他の特徴については、添付図面及び本明細書の記載により明らかとなる。 の 他 Other features of the present invention will be apparent from the accompanying drawings and the description of this specification.
　本発明によれば、蒸気管の表面温度を広範囲に亘って確実に測定することが可能となる。 According to the present invention, it is possible to reliably measure the surface temperature of the steam pipe over a wide range.
本実施形態に係る蒸気管の温度測定装置が用いられる火力発電所の全体構成の一例を示す図である。It is a figure showing an example of the whole composition of the thermal power plant in which the temperature measuring device of the steam pipe concerning this embodiment is used. 本実施形態に係る温度測定装置を蒸気管の直管部分に装着する前の様子を示す斜視図である。It is a perspective view showing the situation before attaching the temperature measuring device concerning this embodiment to a straight pipe part of a steam pipe. 本実施形態に係る温度測定装置を蒸気管の直管部分に装着した後の様子を示す斜視図である。It is a perspective view showing the situation after attaching the temperature measuring device concerning this embodiment to a straight pipe part of a steam pipe. 本実施形態に係る温度測定装置を蒸気管の直管部分に装着した後の様子を示す断面図である。FIG. 4 is a cross-sectional view showing a state after the temperature measuring device according to the present embodiment is mounted on a straight pipe portion of a steam pipe. 本実施形態に係る他の温度測定装置を蒸気管の曲管部分に装着する前の様子を示す斜視図である。It is a perspective view showing a situation before attaching other temperature measuring devices concerning this embodiment to a curved pipe part of a steam pipe. 本実施形態に係る他の温度測定装置を蒸気管の曲管部分に装着した後の様子を示す斜視図である。FIG. 11 is a perspective view showing a state after another temperature measuring device according to the present embodiment is mounted on a curved pipe portion of a steam pipe. 本実施形態に係る他の温度測定装置を蒸気管の曲管部分に装着した後の様子を示す断面図である。It is sectional drawing which shows the mode after attaching the other temperature measuring apparatus which concerns on this embodiment to the curved pipe part of a steam pipe.
　本明細書および添付図面の記載により、少なくとも以下の事項が明らかとなる。 、 At least the following matters will be made clear by the description in this specification and the accompanying drawings.
＝＝＝火力発電所の全体構成の一例＝＝＝
　図１は、本実施形態に係る蒸気管の温度測定装置が用いられる火力発電所の全体構成の一例を示す図である。 === Example of Overall Configuration of Thermal Power Plant ===
FIG. 1 is a diagram illustrating an example of an overall configuration of a thermal power plant in which the steam pipe temperature measuring device according to the present embodiment is used.
　火力発電所１は、ボイラ２、蒸気発生器３、水冷壁４、蒸気弁５、高圧タービン６、中圧タービン７、低圧タービン８、再熱器９、復水器１０、給水ポンプ１１、発電機１２を含んで構成されている。 The thermal power plant 1 includes a boiler 2, a steam generator 3, a water cooling wall 4, a steam valve 5, a high-pressure turbine 6, a medium-pressure turbine 7, a low-pressure turbine 8, a reheater 9, a condenser 10, a feedwater pump 11, and a power generator. Machine 12.
　ボイラ２は、外部から供給される燃料（例えば微粉炭の状態の石炭）と空気を混合して燃焼ガスを生成し、燃焼ガスの熱を用いて水を水蒸気に換える熱交換装置である。ボイラ２には、蒸気発生器３、水冷壁４、再熱器９が収容されている。蒸気発生器３は、復水器１０から供給される水を予熱する節炭器（不図示）と、水冷壁４から供給される飽和蒸気を更に加熱して過熱蒸気にする過熱器（不図示）と、を含んで構成されている。水冷壁４は、ボイラ２のハウジングを形成し、余熱された水を飽和蒸気にして過熱器に供給する。蒸気弁５は、蒸気発生器３で生成される過熱蒸気の流量を制御する調整弁である。 The boiler 2 is a heat exchange device that mixes fuel (for example, pulverized coal) supplied from the outside with air and generates combustion gas, and uses the heat of the combustion gas to convert water into steam. The boiler 2 houses a steam generator 3, a water cooling wall 4, and a reheater 9. The steam generator 3 includes a economizer (not shown) that preheats water supplied from the condenser 10 and a superheater (not shown) that further heats saturated steam supplied from the water cooling wall 4 to superheated steam. ). The water cooling wall 4 forms the housing of the boiler 2 and supplies the superheated water to the superheater as saturated steam. The steam valve 5 is a regulating valve that controls the flow rate of superheated steam generated by the steam generator 3.
　高圧タービン６、中圧タービン７、低圧タービン８の回転軸１３は同一であって、発電機１２の回転軸１４と結合されている。高圧タービン６には、蒸気発生器３で生成される過熱蒸気（第１蒸気）が蒸気弁５を介して供給される。高圧タービン６は、第１蒸気を膨張させ、膨張後の蒸気（第２蒸気）をボイラ２内の再熱器９に供給する。再熱器９は、第２蒸気を再熱し、再熱蒸気（第３蒸気）として中圧タービン７に供給する。中圧タービン７は、第３蒸気を膨張させ、膨張後の蒸気（第４蒸気）を低圧タービン８に供給する。低圧タービン８は、第４蒸気を膨張させる。 The rotating shafts 13 of the high-pressure turbine 6, the medium-pressure turbine 7, and the low-pressure turbine 8 are the same, and are connected to the rotating shaft 14 of the generator 12. Superheated steam (first steam) generated by the steam generator 3 is supplied to the high-pressure turbine 6 via the steam valve 5. The high-pressure turbine 6 expands the first steam and supplies the expanded steam (second steam) to the reheater 9 in the boiler 2. The reheater 9 reheats the second steam and supplies it to the medium-pressure turbine 7 as reheated steam (third steam). The medium-pressure turbine 7 expands the third steam and supplies the expanded steam (fourth steam) to the low-pressure turbine 8. The low-pressure turbine 8 expands the fourth steam.
　復水器１０は、低圧タービン８が第４蒸気を膨張させた後の排気を凝縮して復水に換える。給水ポンプ１１は、復水器１０で生成される復水を昇圧して給水としてボイラ２内の蒸気発生器３に戻している。 (4) The condenser 10 condenses the exhaust gas after the low-pressure turbine 8 expands the fourth steam and converts the exhaust gas into condensate water. The feedwater pump 11 pressurizes the condensed water generated by the condenser 10 and returns the condensed water to the steam generator 3 in the boiler 2 as feedwater.
　そして、発電機１２は、電力が発電されるように、第４蒸気が膨張した際に発生する動力で駆動される。 The generator 12 is driven by power generated when the fourth steam expands so that electric power is generated.
　本実施形態に係る温度測定装置によって、蒸気発生器３に含まれる過熱器を構成する過熱器管（蒸気管）や再熱器９を構成する再熱器管（蒸気管）の表面温度を測定することとなるが、詳細については後述する。尚、説明の便宜上、以下の説明において、過熱器管や再熱器管を蒸気管１５と称することとする。 The surface temperature of a superheater tube (steam tube) constituting the superheater included in the steam generator 3 and a reheater tube (steam tube) constituting the reheater 9 are measured by the temperature measuring device according to the present embodiment. The details will be described later. For convenience of explanation, in the following description, the superheater tube and the reheater tube will be referred to as a steam tube 15.
＝＝＝温度測定装置＝＝＝
　図２は、本実施形態に係る温度測定装置を蒸気管の直管部分に装着する前の様子を示す斜視図である。図３は、本実施形態に係る温度測定装置を蒸気管の直管部分に装着した後の様子を示す斜視図である。図４は、本実施形態に係る温度測定装置を蒸気管の直管部分に装着した後の様子を示す断面図である。尚、温度測定装置は、光ファイバがボイラ内で露出することがないように蒸気管に装着されていることとする。 === Temperature measuring device ===
FIG. 2 is a perspective view showing a state before the temperature measuring device according to the present embodiment is mounted on a straight pipe portion of a steam pipe. FIG. 3 is a perspective view showing a state after the temperature measuring device according to the present embodiment is mounted on a straight pipe portion of a steam pipe. FIG. 4 is a cross-sectional view showing a state after the temperature measuring device according to the present embodiment is mounted on a straight pipe portion of a steam pipe. The temperature measuring device is mounted on the steam pipe so that the optical fiber is not exposed in the boiler.
　温度測定装置１００は、光ファイバ１１０が蒸気管１５の直管部分の表面に密着するように、光ファイバ１１０を介して蒸気管１５の直管部分に装着される金属製（例えばＳＵＳ３０４，ＳＵＳ３１６）の装置である。温度測定装置１００は、光ファイバ１１０とカバー１２０を含んで構成されている。 The temperature measuring device 100 is made of metal (for example, SUS304, SUS316) mounted on the straight pipe portion of the steam pipe 15 via the optical fiber 110 such that the optical fiber 110 is in close contact with the surface of the straight pipe portion of the steam pipe 15. Device. The temperature measuring device 100 includes an optical fiber 110 and a cover 120.
　光ファイバ１１０は、蒸気管１５の表面温度を測定するために、蒸気管１５の長手方向に沿って蒸気管１５の表面に密着するようにカバー１２０によって取り付けられる。光ファイバ１１０にパルス光を入射すると、パルス光は光ファイバ１１０の中で僅かに散乱を起こしながら進行する。その散乱光の１つであるラマン散乱光（ストークス光とアンチストークス光）は温度依存性を有するため、ラマン散乱光を検知することによって被測定物の温度を測定することが可能である。つまり、光ファイバ１１０を蒸気管１５の表面に密着させることによって、蒸気管１５の表面温度を測定することが可能である。光ファイバ１１０の径は、例えば０．２ｍｍ程度である。尚、ラマン散乱光の温度依存性を利用する温度測定方法は周知であるため、その説明を省略する。 The optical fiber 110 is attached by a cover 120 so as to be in close contact with the surface of the steam pipe 15 along the longitudinal direction of the steam pipe 15 in order to measure the surface temperature of the steam pipe 15. When pulse light is incident on the optical fiber 110, the pulse light travels while slightly scattering in the optical fiber 110. Since the Raman scattered light (Stokes light and anti-Stokes light), which is one of the scattered lights, has a temperature dependency, the temperature of the object can be measured by detecting the Raman scattered light. That is, the surface temperature of the steam pipe 15 can be measured by bringing the optical fiber 110 into close contact with the surface of the steam pipe 15. The diameter of the optical fiber 110 is, for example, about 0.2 mm. Since a temperature measuring method using the temperature dependency of Raman scattered light is well known, its description is omitted.
　カバー１２０は、カバー本体１２０１とフランジ１２０２Ａ，１２０２Ｂを含んで構成されている。カバー１２０の厚みは、例えば２～３ｍｍ程度である。 The cover 120 includes a cover main body 1201 and flanges 1202A and 1202B. The thickness of the cover 120 is, for example, about 2 to 3 mm.
　カバー本体１２０１は、蒸気管１５の径よりも僅かに大きい径を有する円筒形状を呈している。カバー本体１２０１の内周面には、光ファイバ１１０を蒸気管１５の長手方向に沿って蒸気管１５の表面に密着させるために、蒸気管１５の長手方向に沿って光ファイバ１１０を収容するための溝１２０１Ｃが形成されている。溝１２０１Ｃは、例えばカバー本体１２０１におけるフランジ１２０２Ａ，１２０２Ｂの反対側に形成されている。温度測定装置１００をボイラ２内に設置する場合、燃焼ガスがフランジ１２０２Ａ，１２０２Ｂに当たると、燃焼ガスの流れが乱れてしまうため、フランジ１２０２Ａ，１２０２Ｂが燃焼ガスの下流側（燃焼ガスが当たる側とは反対側）を向くように、温度測定装置１００は設置される。溝１２０１Ｃは、光ファイバ１１０が蒸気管１５の表面に密着する程度の窪みを有している。カバー本体１２０１は、蒸気管１５の長手方向に沿って１本の隙間が形成されるように、蒸気管１５の長手方向に沿う端面１２０１Ａ，１２０１Ｂを有している。フランジ１２０２Ａ，１２０２Ｂは、それぞれ、蒸気管１５から遠ざかるように端面１２０１Ａ，１２０１Ｂから延在して形成されている。フランジ１２０２Ａ，１２０２Ｂは、それぞれ、蒸気管１５の長手方向に沿って複数の孔１２０３Ａ，１２０３Ｂを有している。複数の孔１２０３Ａ，１２０３Ｂは、それぞれ、ボルト１２０４がナット１２０５と螺合するように連通している。そして、温度測定装置１００の剛性に抗してフランジ１０２０Ａ，１２０２Ｂの間の隙間を広げながらカバー本体１２０１を蒸気管１５に被せた後、ボルト１２０４を複数の孔１２０３Ａ，１２０３Ｂに挿入してボルト１２０４とナット１２０５を締め付けると、フランジ１２０２Ａ，１２０２Ｂの間の隙間がなくなって、カバー本体１２０１は蒸気管１５に密着して装着される。 The cover body 1201 has a cylindrical shape having a diameter slightly larger than the diameter of the steam pipe 15. On the inner peripheral surface of the cover body 1201, the optical fiber 110 is accommodated along the longitudinal direction of the steam pipe 15 in order to adhere the optical fiber 110 to the surface of the steam pipe 15 along the longitudinal direction of the steam pipe 15. Groove 1201C is formed. The groove 1201C is formed, for example, on the opposite side of the cover body 1201 from the flanges 1202A and 1202B. When the temperature measuring device 100 is installed in the boiler 2, when the combustion gas hits the flanges 1202A and 1202B, the flow of the combustion gas is disturbed. Therefore, the flanges 1202A and 1202B are located downstream of the combustion gas (the side where the combustion gas hits). Is located on the opposite side). The groove 1201C has such a depression that the optical fiber 110 is in close contact with the surface of the steam pipe 15. The cover main body 1201 has end faces 1201A and 1201B along the longitudinal direction of the steam pipe 15 so that one gap is formed along the longitudinal direction of the steam pipe 15. The flanges 1202A and 1202B are formed to extend from the end surfaces 1201A and 1201B so as to be away from the steam pipe 15, respectively. The flanges 1202A and 1202B have a plurality of holes 1203A and 1203B, respectively, along the longitudinal direction of the steam pipe 15. The plurality of holes 1203A and 1203B communicate with each other such that the bolt 1204 is screwed with the nut 1205. Then, after covering the cover main body 1201 on the steam pipe 15 while widening the gap between the flanges 1020A and 1202B against the rigidity of the temperature measuring device 100, the bolts 1204 are inserted into the plurality of holes 1203A and 1203B to insert the bolts 1204. When the nut 1205 is tightened, the gap between the flanges 1202A and 1202B disappears, and the cover main body 1201 is attached in close contact with the steam pipe 15.
　ボイラ２において、復水器１０から供給される水を燃焼ガスと熱交換するとき、燃焼ガスの温度は例えば１２００℃程度であり、蒸気管１５を循環する蒸気の温度は例えば６００℃程度である。光ファイバ１１０はカバー１２０によって燃焼ガスには直接触れないため、光ファイバ１１０の温度は蒸気管１５の表面温度の影響のみを受ける。従って、光ファイバ１１０の温度は７００℃未満に抑えられ、蒸気管１５の表面温度を確実に取得することが可能となる。蒸気管１５の表面温度の情報は、ネットワークを介して監視用の外部機器（不図示）に取り込まれて温度分布が求められる。更に、カバー１２０は蒸気管１５を取り囲むため、蒸気管１５のクリープ強度を向上させることが可能となる。 When the water supplied from the condenser 10 is heat-exchanged with the combustion gas in the boiler 2, the temperature of the combustion gas is, for example, about 1200 ° C., and the temperature of the steam circulating in the steam pipe 15 is, for example, about 600 ° C. . Since the optical fiber 110 does not directly contact the combustion gas with the cover 120, the temperature of the optical fiber 110 is affected only by the surface temperature of the steam pipe 15. Therefore, the temperature of the optical fiber 110 is suppressed to less than 700 ° C., and the surface temperature of the steam pipe 15 can be reliably obtained. Information on the surface temperature of the steam pipe 15 is taken into an external monitoring device (not shown) via a network, and a temperature distribution is obtained. Further, since the cover 120 surrounds the steam pipe 15, the creep strength of the steam pipe 15 can be improved.
　図５は、本実施形態に係る他の温度測定装置を蒸気管の曲管部分に装着する前の様子を示す斜視図である。図６は、本実施形態に係る他の温度測定装置を蒸気管の曲管部分に装着した後の様子を示す斜視図である。図７は、本実施形態に係る他の温度測定装置を蒸気管の曲管部分に装着した後の様子を示す断面図である。尚、温度測定装置は、光ファイバがボイラ内で露出することがないような長さを有して蒸気管に装着されることとする。 FIG. 5 is a perspective view showing a state before the other temperature measuring device according to the present embodiment is mounted on the curved pipe portion of the steam pipe. FIG. 6 is a perspective view showing a state after another temperature measuring device according to the present embodiment is mounted on a curved pipe portion of a steam pipe. FIG. 7 is a cross-sectional view showing a state after another temperature measuring device according to the present embodiment is mounted on a curved pipe portion of a steam pipe. The temperature measuring device is attached to the steam pipe so that the optical fiber is not exposed in the boiler.
　温度測定装置２００は、光ファイバ２１０が蒸気管１５の曲管部分の表面に密着するように、光ファイバ２１０を介して蒸気管１５の曲管部分に装着される金属製（例えばＳＵＳ３０４，ＳＵＳ３１６）装置である。温度測定装置２００は、光ファイバ２１０とカバー２２０を含んで構成されている。 The temperature measuring device 200 is made of metal (for example, SUS304, SUS316) mounted on the bent portion of the steam pipe 15 via the optical fiber 210 so that the optical fiber 210 is in close contact with the surface of the bent portion of the steam tube 15. Device. The temperature measuring device 200 includes an optical fiber 210 and a cover 220.
　光ファイバ２１０は、蒸気管１５の表面温度を測定するために、蒸気管１５の長手方向（曲管部分の形状）に沿って蒸気管１５の表面に密着するようにカバー２２０によって取り付けられる。そして、光ファイバ１１０と同様に、光ファイバ２１０を蒸気管１５の表面に密着させ、ラマン散乱光の温度依存性を利用することによって、蒸気管１５の表面温度を測定することが可能となる。光ファイバ２１０の径は、例えば０．２ｍｍ程度である。 The optical fiber 210 is attached by the cover 220 so as to be in close contact with the surface of the steam pipe 15 along the longitudinal direction (the shape of the curved pipe portion) of the steam pipe 15 in order to measure the surface temperature of the steam pipe 15. Then, similarly to the optical fiber 110, the surface temperature of the steam pipe 15 can be measured by bringing the optical fiber 210 into close contact with the surface of the steam pipe 15 and utilizing the temperature dependency of the Raman scattered light. The diameter of the optical fiber 210 is, for example, about 0.2 mm.
　カバー２２０は、カバー本体２２０１とフランジ２２０２Ａ，２２０２Ｂを含んで構成されている。カバー２２０の厚みは、例えば２～３ｍｍ程度である。 The cover 220 includes a cover body 2201 and flanges 2202A and 2202B. The thickness of the cover 220 is, for example, about 2 to 3 mm.
　カバー本体２２０１は、蒸気管１５の径よりも僅かに大きい径を有し、蒸気管１５の曲率に応じた円筒形状を呈している。カバー本体２２０１の内周面には、光ファイバ２１０を蒸気管１５の長手方向に沿って蒸気管１５の表面に密着させるために、蒸気管１５の長手方向に沿って光ファイバ２１０を収容するための溝２２０１Ｃが形成されている。溝２２０１Ｃは、例えばカバー本体２２０１におけるフランジ２２０２Ａ，２２０２Ｂの反対側に形成されている。温度測定装置２００をボイラ２内に設置する場合、燃焼ガスがフランジ２２０２Ａ，２２０２Ｂに当たると、燃焼ガスの流れが乱れてしまうため、フランジ２２０２Ａ，２２０２Ｂが燃焼ガスの下流側（燃焼ガスが当たる側とは反対側）を向くように、温度測定装置２００は設置される。又、温度測定装置２００として、ボイラ２内に配置されている蒸気管１５の曲管部分に装着した際に、フランジ２２０２Ａ，２２０２Ｂが常に燃焼ガスの下流側を向くような様々な形状を呈するバリエーションが予め用意されていることとする。溝２２０１Ｃは、光ファイバ２１０が蒸気管１５の表面に密着する程度の窪みを有している。カバー本体２２０１は、蒸気管１５の長手方向に沿って１本の隙間が形成されるように、蒸気管１５の長手方向に沿う端面２２０１Ａ，２２０１Ｂを有している。フランジ２２０２Ａ，２２０２Ｂは、それぞれ、蒸気管１５から遠ざかるように端面２２０１Ａ，２２０１Ｂから延在して形成されている。フランジ２２０２Ａ，２２０２Ｂは、それぞれ、蒸気管１５の長手方向に沿って複数の孔２２０３Ａ，２２０３Ｂを有している。複数の孔２２０３Ａ，２２０３Ｂは、それぞれ、ボルト２２０４がナット２２０５と螺合するように連通している。そして、温度測定装置２００の剛性に抗してフランジ２０２０Ａ，２２０２Ｂの間の隙間を広げながらカバー本体２２０１を蒸気管１５の曲管部分に被せた後、ボルト２２０４を複数の孔２２０３Ａ，２２０３Ｂに挿入してボルト２２０４とナット２２０５を締め付けると、フランジ２２０２Ａ，２２０２Ｂの間の隙間がなくなって、カバー本体２２０１は蒸気管１５の曲管部分に密着して装着される。 The cover body 2201 has a diameter slightly larger than the diameter of the steam pipe 15 and has a cylindrical shape according to the curvature of the steam pipe 15. The inner peripheral surface of the cover body 2201 is for accommodating the optical fiber 210 along the longitudinal direction of the steam pipe 15 in order to bring the optical fiber 210 into close contact with the surface of the steam pipe 15 along the longitudinal direction of the steam pipe 15. Groove 2201C is formed. The groove 2201C is formed on the cover body 2201, for example, on the opposite side of the flanges 2202A and 2202B. When the temperature measuring device 200 is installed in the boiler 2, when the combustion gas hits the flanges 2202A and 2202B, the flow of the combustion gas is disturbed. Therefore, the flanges 2202A and 2202B are located downstream of the combustion gas (the side where the combustion gas hits). The temperature measuring device 200 is installed so as to face the opposite side. In addition, when the temperature measuring device 200 is mounted on a curved portion of the steam pipe 15 disposed in the boiler 2, the flanges 2202A and 2202B always have various shapes so as to always face the downstream side of the combustion gas. Is prepared in advance. The groove 2201C has such a depression that the optical fiber 210 is in close contact with the surface of the steam pipe 15. The cover body 2201 has end faces 2201A and 2201B along the longitudinal direction of the steam pipe 15 so that one gap is formed along the longitudinal direction of the steam pipe 15. The flanges 2202A and 2202B are formed to extend from the end faces 2201A and 2201B so as to be away from the steam pipe 15, respectively. The flanges 2202A and 2202B have a plurality of holes 2203A and 2203B, respectively, along the longitudinal direction of the steam pipe 15. The plurality of holes 2203A and 2203B communicate with each other such that the bolt 2204 is screwed with the nut 2205. Then, after covering the cover main body 2201 over the curved pipe portion of the steam pipe 15 while widening the gap between the flanges 2020A and 2202B against the rigidity of the temperature measuring device 200, the bolts 2204 are inserted into the plurality of holes 2203A and 2203B. Then, when the bolt 2204 and the nut 2205 are tightened, the gap between the flanges 2202A and 2202B disappears, and the cover main body 2201 is attached to the bent portion of the steam pipe 15 in close contact.
　光ファイバ２１０はカバー２２０によって燃焼ガスには直接触れないため、光ファイバ２１０の温度は蒸気管１５の表面温度の影響のみを受ける。従って、光ファイバ２１０の温度は７００℃未満に抑えられ、蒸気管１５の曲管部分の表面温度を確実に取得することが可能となる。蒸気管１５の表面温度の情報は、ネットワークを介して監視用の外部機器（不図示）に取り込まれて温度分布が求められる。更に、カバー２２０は蒸気管１５を取り囲むため、蒸気管１５のクリープ強度を向上させることが可能となる。 た め Since the optical fiber 210 does not directly contact the combustion gas with the cover 220, the temperature of the optical fiber 210 is affected only by the surface temperature of the steam pipe 15. Therefore, the temperature of the optical fiber 210 is suppressed to less than 700 ° C., and the surface temperature of the curved portion of the steam pipe 15 can be reliably obtained. Information on the surface temperature of the steam pipe 15 is taken into an external monitoring device (not shown) via a network, and a temperature distribution is obtained. Further, since the cover 220 surrounds the steam pipe 15, the creep strength of the steam pipe 15 can be improved.
　蒸気管１５は、直管部分と曲管部分が連続する形状を呈している。そこで、蒸気管１５における直管部分と曲管部分の表面温度を測定する場合、カバー１２０を蒸気管１５の直管部分に装着し、カバー２２０を蒸気管１５の曲管部分に装着すればよい。又、カバー２２０を蒸気管１５の曲管部分に二重に装着し、蒸気管１５の曲管部分を補強してもよい。 The steam pipe 15 has a shape in which a straight pipe portion and a curved pipe portion are continuous. Therefore, when measuring the surface temperature of the straight pipe portion and the curved pipe portion of the steam pipe 15, the cover 120 may be attached to the straight pipe portion of the steam pipe 15, and the cover 220 may be attached to the curved pipe portion of the steam pipe 15. . Further, the cover 220 may be double mounted on the curved pipe portion of the steam pipe 15 to reinforce the curved pipe section of the steam pipe 15.
　以上説明したように、本実施形態に係る温度測定装置１００（２００）は、ボイラ２に供給される水を燃焼ガスと熱交換して得られる蒸気が内部を循環する蒸気管１５（過熱器管や再熱器管）の表面温度を測定するための光ファイバ１１０（２１０）と、光ファイバ１１０（２１０）が蒸気管１５の長手方向に沿って蒸気管１５に密着するように、光ファイバ１１０（２１０）を挟んで蒸気管１５を取り囲むように装着されるカバー１２０（２２０）と、を備える。本実施形態によれば、光ファイバ１１０（２１０）はカバー１２０（２２０）によって燃焼ガスには直接触れず、光ファイバ１１０（２１０）の温度は蒸気管１５の表面温度の影響のみを受けるため、光ファイバ１１０（２１０）の温度は７００℃未満に抑えられ、蒸気管１５の表面温度を確実に取得することが可能となる。更に、カバー１２０（２２０）は蒸気管１５を取り囲むため、蒸気管１５のクリープ強度を向上させることが可能となる。 As described above, the temperature measuring device 100 (200) according to the present embodiment includes the steam pipe 15 (superheater pipe) in which steam obtained by heat-exchanging water supplied to the boiler 2 with combustion gas circulates. And the optical fiber 110 (210) for measuring the surface temperature of the reheater tube) and the optical fiber 110 (210) so that the optical fiber 110 (210) adheres to the steam tube 15 along the longitudinal direction of the steam tube 15. And a cover 120 (220) attached so as to surround the steam pipe 15 with the (210) interposed therebetween. According to this embodiment, the optical fiber 110 (210) does not directly contact the combustion gas by the cover 120 (220), and the temperature of the optical fiber 110 (210) is affected only by the surface temperature of the steam pipe 15, The temperature of the optical fiber 110 (210) is suppressed to less than 700 ° C., and the surface temperature of the steam pipe 15 can be reliably obtained. Furthermore, since the cover 120 (220) surrounds the steam pipe 15, the creep strength of the steam pipe 15 can be improved.
　又、本実施形態において、カバー１２０（２２０）は、蒸気管１５に装着された際に光ファイバ１１０（２１０）が収容されるように、蒸気管１５の長手方向に沿って窪む溝１２０１Ｃ（２２０１Ｃ）を有する。本実施形態によれば、光ファイバ１１０（２１０）を蒸気管１５に密着させたまま保護することが可能となる。 Further, in the present embodiment, the cover 120 (220) has a groove 1201C () that is recessed along the longitudinal direction of the steam pipe 15 so that the optical fiber 110 (210) is accommodated when the cover 120 (220) is mounted on the steam pipe 15. 2201C). According to the present embodiment, it is possible to protect the optical fiber 110 (210) while keeping the optical fiber 110 (210) in close contact with the steam pipe 15.
　又、本実施形態において、カバー１２０（２２０）は、蒸気管１５の長手方向に沿う隙間を有し、蒸気管１５を取り囲む円筒形状を呈するカバー本体１２０１（２２０１）と、カバー本体１２０１（２２０１）の両端に形成され、カバー本体１２０１（２２０１）が蒸気管１５に密着するようにボルト１２０４（２２０４）及びナット１２０５（２２０５）によって締め付けられるフランジ１２０２Ａ（２２０２Ａ），１２０２Ｂ（２２０２Ｂ）と、を有する。 In the present embodiment, the cover 120 (220) has a gap along the longitudinal direction of the steam pipe 15 and has a cylindrical cover body 1201 (2201) surrounding the steam pipe 15, and a cover body 1201 (2201). And flanges 1202A (2202A) and 1202B (2202B) which are formed at both ends of the cover and are fastened by bolts 1204 (2204) and nuts 1205 (2205) so that the cover main body 1201 (2201) is in close contact with the steam pipe 15.
　又、本実施形態において、カバー１２０（２２０）は、合金鋼から形成される。特に、カバー１２０（２２０）は、ステンレス鋼（ＳＵＳ３０４やＳＵＳ３１６）から形成されることが望ましい。 In the present embodiment, the cover 120 (220) is formed from an alloy steel. In particular, it is desirable that the cover 120 (220) be formed from stainless steel (SUS304 or SUS316).
　尚、上記の実施形態は、本発明の理解を容易にするためのものであり、本発明を限定して解釈するためのものではない。本発明は、その趣旨を逸脱することなく、変更、改良され得るとともに、本発明にはその等価物も含まれる。例えば、カバー１２０（２２０）は、フランジ１２０２Ａ（２２０２Ａ），１２０２Ｂ（２２０２Ｂ）を設けずに蒸気管１５に対して溶接されてもよい。 Note that the above-described embodiment is for the purpose of facilitating the understanding of the present invention, and is not for limiting and interpreting the present invention. The present invention can be modified and improved without departing from the spirit thereof, and the present invention also includes equivalents thereof. For example, the cover 120 (220) may be welded to the steam pipe 15 without providing the flanges 1202A (2202A) and 1202B (2202B).
１　火力発電所
２　ボイラ
３　蒸気発生器
６　高圧タービン
７　中圧タービン
８　低圧タービン
９　再熱器
１０　復水器
１２　発電機
１００，２００　温度測定装置
１１０，２１０　光ファイバ
１２０，２２０　カバー
１２０１，２２０１　カバー本体
１２０１Ａ，１２０１Ｂ，２２０１Ａ，２２０１Ｂ　端面
１２０１Ｃ，２２０１Ｃ　溝
１２０２Ａ，１２０２Ｂ，２２０２Ａ，２２０２Ｂ　フランジ
１２０３Ａ，１２０３Ｂ，２２０３Ａ，２２０３Ｂ　孔
１２０４，２２０４　ボルト
１２０５，２２０５　ナット DESCRIPTION OF SYMBOLS 1 Thermal power plant 2 Boiler 3 Steam generator 6 High pressure turbine 7 Medium pressure turbine 8 Low pressure turbine 9 Reheater 10 Condenser 12 Generator 100, 200 Temperature measuring device 110, 210 Optical fiber 120, 220 Cover 1201, 201 Cover Body 1201A, 1201B, 2201A, 2201B End face 1201C, 2201C Groove 1202A, 1202B, 2202A, 2202B Flange 1203A, 1203B, 2203A, 2203B Hole 1204, 2204 Bolt 1205, 2205 Nut

Claims (10)

  1. 　ボイラに供給される水を燃焼ガスと熱交換して得られる蒸気が内部を循環する蒸気管の表面温度を測定するための光ファイバと、
    　前記光ファイバが前記蒸気管の長手方向に沿って前記蒸気管に密着するように、前記光ファイバを挟んで前記蒸気管を取り囲むように装着されるカバーと、
    　を備えたことを特徴とする蒸気管の温度測定装置。     An optical fiber for measuring the surface temperature of a steam pipe in which steam obtained by heat-exchanging water supplied to the boiler with combustion gas circulates,
    A cover attached so as to surround the steam pipe with the optical fiber interposed therebetween, so that the optical fiber is in close contact with the steam pipe along the longitudinal direction of the steam pipe;
    A steam pipe temperature measuring device comprising:
  2. 　前記カバーは、前記蒸気管に装着された際に前記光ファイバが収容されるように、前記蒸気管の長手方向に沿って窪む溝を有する
    　ことを特徴とする請求項１に記載の蒸気管の温度測定装置。     The steam pipe according to claim 1, wherein the cover has a groove that is depressed along a longitudinal direction of the steam pipe so that the optical fiber is accommodated when the cover is attached to the steam pipe. Temperature measuring device.
  3. 　前記カバーは、
    　　前記蒸気管の長手方向に沿う隙間を有し、前記蒸気管を取り囲む円筒形状を呈するカバー本体と、
    　　前記カバー本体の両端に形成され、前記カバー本体が前記蒸気管に密着するようにボルトによって締め付けられるフランジと、を有する
    　ことを特徴とする請求項１又は請求項２に記載の蒸気管の温度測定装置。     The cover,
    A cover body having a gap along the longitudinal direction of the steam pipe and having a cylindrical shape surrounding the steam pipe,
    The temperature measurement of the steam pipe according to claim 1 or 2, further comprising: a flange formed at both ends of the cover main body, the flange being fastened by bolts so that the cover main body is in close contact with the steam pipe. apparatus.
  4. 　前記カバーは、合金鋼から形成される
    　ことを特徴とする請求項１～請求項３の何れか一項に記載の蒸気管の温度測定装置。     The steam pipe temperature measuring device according to any one of claims 1 to 3, wherein the cover is made of an alloy steel.
  5. 　前記カバーは、ステンレス鋼から形成される
    　ことを特徴とする請求項４に記載の蒸気管の温度測定装置。     The steam pipe temperature measuring device according to claim 4, wherein the cover is formed of stainless steel.
  6. 　前記蒸気管は、過熱器管である
    　ことを特徴とする請求項１～請求項５の何れか一項に記載の蒸気管の温度測定装置。     The steam pipe temperature measuring device according to any one of claims 1 to 5, wherein the steam pipe is a superheater pipe.
  7. 　前記蒸気管は、再熱器管である
    　ことを特徴とする請求項１～請求項５の何れか一項に記載の蒸気管の温度測定装置。     The steam pipe temperature measuring device according to any one of claims 1 to 5, wherein the steam pipe is a reheater pipe.
  8. 　ボイラに供給される水を燃焼ガスと熱交換して得られる蒸気が内部を循環する蒸気管の表面温度を測定するための光ファイバが、前記蒸気管の長手方向に沿って前記蒸気管に密着するように、前記光ファイバを挟んで前記蒸気管を取り囲むカバーを装着する
    　ことを特徴とする蒸気管の温度測定方法。     An optical fiber for measuring a surface temperature of a steam pipe in which steam obtained by heat-exchanging water supplied to the boiler with a combustion gas circulates is closely attached to the steam pipe along a longitudinal direction of the steam pipe. A method for measuring the temperature of a steam pipe, comprising: mounting a cover surrounding the steam pipe with the optical fiber interposed therebetween.
  9. 　前記カバーは、合金鋼から形成される
    　ことを特徴とする請求項８に記載の蒸気管の温度測定方法。     The method according to claim 8, wherein the cover is made of an alloy steel.
  10. 　前記カバーは、ステンレス鋼から形成される
    　ことを特徴とする請求項９に記載の蒸気管の温度測定方法。
     
          The method according to claim 9, wherein the cover is formed of stainless steel.

PCT/JP2018/033920 2018-09-13 2018-09-13 Steam-pipe temperature measurement device, steam-pipe temperature measurement method WO2020054010A1 (en)

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JPH06137509A (en) * 1992-10-29 1994-05-17 Ishikawajima Harima Heavy Ind Co Ltd Method and apparatus for detecting temperatures of parts of boiler
JPH0854289A (en) * 1994-08-11 1996-02-27 Sokuon Kogyo:Kk Sensor mounting structure
JPH11108765A (en) * 1997-09-30 1999-04-23 Matsushita Electric Works Ltd Structure for fixing temperature detecting sensor
JP2007024830A (en) * 2005-07-21 2007-02-01 Okazaki Mfg Co Ltd Attaching structure of surface thermometer
JP2010014583A (en) * 2008-07-04 2010-01-21 Hitachi-Ge Nuclear Energy Ltd Steam generating apparatus
CA2799824A1 (en) * 2012-12-20 2014-06-20 General Electric Company System and method for monitoring steam generator tube operating conditions
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