US20130340976A1 - Heat exchanger and method for estimating remaining life of heat exchanger - Google Patents

Heat exchanger and method for estimating remaining life of heat exchanger Download PDF

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Publication number
US20130340976A1
US20130340976A1 US14/004,625 US201214004625A US2013340976A1 US 20130340976 A1 US20130340976 A1 US 20130340976A1 US 201214004625 A US201214004625 A US 201214004625A US 2013340976 A1 US2013340976 A1 US 2013340976A1
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US
United States
Prior art keywords
heat
heat exchanger
tube
dummy tube
dummy
Prior art date
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Abandoned
Application number
US14/004,625
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English (en)
Inventor
Naoyuki Kamiyama
Tsuyoshi Miyachi
Takuya Okamoto
Yuichiro Sato
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD. reassignment MITSUBISHI HEAVY INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAMIYAMA, NAOYUKI, MIYACHI, Tsuyoshi, OKAMOTO, TAKUYA, SATO, YUICHIRO
Publication of US20130340976A1 publication Critical patent/US20130340976A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2200/00—Prediction; Simulation; Testing

Definitions

  • the present invention relates to a heat exchanger and a method for estimating a remaining life of the heat exchanger.
  • an NOx removal unit, an air pre-heater air heater, a heat recovery unit of a re-heating gas-gas heater, a dry electronic precipitator, a wet desulfurization unit, and a re-heater and a stack of the gas-gas heater are disposed in a flue gas flow path in order.
  • a water tube type gas-gas heater is configured to connect the heat recovery unit with the re-heater by a cold and hot water circulation line to perform the heat exchange with the flue gas by a circulation pump using water as a medium.
  • this control device after the flue gas of the boiler is led to the air heater, is heat-exchanged with the combustion air to cool the temperature of the flue gas to, for example, approximately 130 to 150° C., and is led to the heat recovery unit of the gas-gas heater to further cool the temperature of the flue gas, the flue gas is led to the electronic precipitator to remove the fly ash, and then the high-temperature flue gas at an outlet of the electronic precipitator is further cooled by the heat-exchange with water and is led to the wet desulfurization unit.
  • the flue gas from which SO 2 and the fly ash are removed is lead to the gas-gas heater re-heater.
  • the temperature of the flue gas lowered by the SO 2 absorbent or the like in the processing procedure of the wet desulfurization unit is raised by the heat-exchange with a heat medium passing through the interior of the path disposed in the gas-gas heater re-heater.
  • a fin tube-type heat exchanger has been proposed as a heat exchanging method of a large gas-gas heater heat recovery unit and the re-heater in a coal-fired power plant (Patent Literature 1).
  • Patent Literature 1 Japanese Laid-open Patent Publication No. 11-304138
  • a water level of the heat medium tank is detected, when the water level drops to a predetermined level, an alarm is emitted from a control device, and when the alarm is emitted, first, it is estimated whether the leakage is on the heat recovery side or on the re-heating side (a heat medium input and output valves are closed one by one to confirm whether or not the water level of the heat medium tank drops), then a hermetic leak check is performed on the individual bundle of the specified side, and the refinement repair is performed at the position of the leak tube of the leak bundle by an air-tight test.
  • An object of the invention is to provide a heat exchanger capable of eliminating the trouble of the leakage test time, and a method for estimating a remaining life of the heat exchanger in view of the above problems.
  • a heat exchanger having a plurality of heat transfer tubes for heat recovery or heat exchange, the heat exchanger including: a dummy tube provided in any one or both of a gas inlet side or a gas discharge side of the heat exchanger, for circulating a heat medium from a heat medium circulation path.
  • the heat exchanger according to the first aspect, wherein the dummy tube is a through tube passing through the heat exchanger or a U-shaped tube folded back in the middle of the heat exchanger.
  • the heat exchanger having a plurality of heat transfer tubes for heat recovery or heat exchange, the heat exchanger including: a dummy tube provided in any one or both of a gas inlet side or a gas discharge side of the heat exchanger, the dummy tube having a filling liquid in which an electrically conductive medium is contained in a heat medium from a heat medium circulation path; and a conductive sensor having a tip end immersed in the filling liquid.
  • the heat exchanger according to any one of the first to third aspects, wherein the dummy tube is installed at a position in which a wear rate of the heat transfer tube is fast.
  • a method of estimating a remaining life of the heat exchanger including: determining a thickness reduction condition of the heat transfer tube from degradation state of the dummy tube; and predicting a replacement timing of the heat transfer tube.
  • the invention it is possible to periodically extract the dummy tube, check the quantity of thickness reduction of the surface thereof, and determine the state of damage or the like of the heat transfer tube.
  • FIG. 1 is a schematic diagram of a heat exchanger of air pollution control equipment according to a first embodiment.
  • FIG. 2 is a schematic diagram of another heat exchanger according to the first embodiment.
  • FIG. 3 is a diagram illustrating a relation between a thickness of a heat transfer tube and an operating time.
  • FIG. 4 is a schematic diagram of a dummy tube according to a second embodiment.
  • FIG. 5 is a schematic diagram of the dummy tube according to the second embodiment equipped with a conductive sensor.
  • FIG. 6 is a schematic diagram of an air pollution control system to which a heat exchanger according to the embodiment is applied.
  • FIG. 6 is a schematic diagram of an air pollution control system to which a heat exchanger according to the embodiment is applied.
  • an air pollution control system 100 removes nitrogen oxides (NOx), soot, and sulfur oxides (SOx) contained in the flue gas in the process when a flue gas G 8 discharged from a boiler 101 of power generation plants, factories and the like is discharged from a stack 111 .
  • NOx nitrogen oxides
  • SOx sulfur oxides
  • a flue gas G 0 discharged from the boiler 101 is introduced into an NOx removal device 102 filled with catalyst.
  • nitrogen oxide contained in the flue gas G 0 is reduced to water and nitrogen by ammonia (NH 3 ) injected as a reducing agent, and is converted into a harmless gas.
  • NH 3 ammonia
  • a flue gas G 1 discharged from the NOx removal device 102 is generally cooled to a temperature of 130° C. to 150° C. via an air heater (AH) 103 .
  • a flue gas G 2 passed through the air heater 103 is introduced into a heat recovery unit 104 serving as a heat exchanger of a gas-gas heater, and the heat thereof is recovered by performing the heat exchange between the flue gas G 2 and a heat medium (for example, such as water).
  • the temperature of a flue gas G 3 passed through the heat recovery unit 104 is approximately 85 to 110° C., and the precipitating capacity of an electronic precipitator (EP) 105 is improved.
  • the flue gas G 3 passed through the heat recovery unit 104 is introduced into the electronic precipitator 105 , and the soot is removed.
  • a flue gas G 4 passed through the electronic precipitator 105 is boosted by a blower 106 that is driven by an electric motor.
  • the blower 106 may not provided, and may also be disposed on the downstream of a re-heater 108 of the gas-gas heater.
  • a flue gas G 5 boosted by the blower 106 is introduced into a desulfurization unit 107 .
  • sulfur oxide in the flue gas G 5 is absorbed and removed by an absorbent in which a limestone is dissolved in a slurry form, and gypsum (not illustrated) is produced as a byproduct.
  • the temperature of a flue gas G 6 passed through the desulfurization unit 107 is generally reduced to about 50° C.
  • a heat medium (not illustrated) is circulated through a pair of circulation paths 110 by a circulation pump 109 , and is heat exchanged.
  • FIG. 1 is a schematic diagram of a heat exchanger of air pollution control equipment according to the first embodiment.
  • FIG. 2 is a schematic diagram of another heat exchanger according to the first embodiment.
  • the flue gas G 6 passed through the desulfurization unit 107 is introduced into the re-heater 108 serving as a heat exchanger of the gas-gas heater.
  • the flue gas G 6 is heated by the recovery heat recovered by the heat recovery unit 104 .
  • the temperature of the flue gas G 6 of the desulfurization unit 107 of approximately of 50° C. is re-heated to approximately 85 to 110° C. by the re-heater 108 , and is emitted into the atmosphere from the stack 111 .
  • FIG. 1 there is provided a heat exchanger into which the flue gas G 2 is introduced to perform the heat exchange with the heat medium 83 .
  • the heat exchanger has a heat medium circulation path L 1 through which the heat medium 83 is circulated between the heat recovery unit 104 and the re-heater 108 .
  • the heat medium 83 is circulated between the heat recovery unit 104 and the re-heater 108 via the heat medium circulation path L 1 .
  • a plurality of fins serving as a heat transfer tubes is provided in a heat transfer tube 11 .
  • a heat exchange unit 86 is provided in the heat medium circulation path L 1 , and compensates energy equivalent to the temperature drop robbed in heat dissipation by heating with a steam 87 when the heat medium 83 is circulated, and thus the temperature of the medium of the heat medium 83 can be maintained and adjusted.
  • the heat medium 83 is supplied to the heat medium circulation path L 1 from a heat medium tank 88 .
  • the heat medium 83 is circulated in the heat medium circulation path L 1 by the circulation pump 109 .
  • a quantity of supply of the steam 87 is adjusted by a regulating valve V 1 according to the gas temperature of the flue gas G 6 from the desulfurization unit 107 , and the heat medium 83 delivered to the re-heater 108 by a regulating valve V 2 according to the gas temperature of the flue gas G 3 discharged from the heat recovery unit 104 is supplied to the heat recovery unit 104 , thereby adjusting the quantity of supply of the heat medium 83 delivered to the re-heater 108 .
  • a purified gas G 7 discharged from the re-heater 108 is discharged to the outside from the stack 111 .
  • a series internal circulation type dummy tube (hereinafter, referred to as a “dummy tube”) 30 is provided near a gas inlet side and a gas outlet side of the heat recovery unit 104 , and near a gas discharge side of the re-heater 108 , via an intubation 31 , respectively.
  • the heat medium 83 is circulated in the series internal circulation type dummy tube 30 by a branched path L 2 that branches from the heat medium circulation path L 1 .
  • the series internal circulation type dummy tube 30 is preferably a bare tube to which an external fin is not fixed.
  • a pressure P 1B , of the series internal circulation type dummy tube 30 side becomes slightly higher than a pressure gauge P 1A of the circulation path L 1 , which makes it possible to return the heat medium 83 to the circulation path L 1 .
  • the dummy tube 30 may be a through tube that passes through the heat recovery unit 104 (the re-heater 108 ) as illustrated in FIG. 1 .
  • the through tube in a case where the through tube is too long, it may be a U-shaped internal circulation type dummy tube folded back in the middle of the heat recovery unit 104 (the re-heater 108 ) inserted from one side.
  • the dummy tube 30 As an installation position of the dummy tube 30 , by estimating a location where a wear rate is high by the gas flow simulation or the like in advance, the dummy tube 30 may be installed in the vicinity thereof.
  • the heat medium 83 partially extracted from the circulation path L 1 passes into the dummy tube 30 , and the dummy tube 30 is periodically extracted to check the quantity of thickness reduction of the surface.
  • the approximate damage position can also be understood, and measures also become easier.
  • the replacement timing of the heat transfer tube 11 is estimated from the periodical extraction test results by extrapolation, and the necessary replacement time can be guessed. Thus, it is possible to minimize the residual thickness, and the update facility can also be efficiently prepared.
  • FIG. 3 is a graph illustrating a relation between the thickness of the heat transfer tube and an operating time.
  • a thickness reduction rate estimation frequency can be raised by the dummy tube of the embodiment, a prediction accuracy of the remaining life is improved, and the maintenance plan is easily made in response thereto.
  • a bundle replacement schedule (I) is set, and the bundle replacement
  • a bundle replacement schedule (II) is set, and the bundle replacement (II) is performed in the (X+1)-th year.
  • thickness shell requirement (TSR) in FIG. 3 refers to a minimum thickness required for the heat transfer tube to keep the strength.
  • the accuracy of the thickness reduction management is improved by monitoring the corrosion thickness reduction due to the heat medium 83 on the inner surface of the heat transfer tube 11 , and monitoring the wear of the outer surface and the internal corrosion.
  • FIG. 4 is a schematic diagram of a dummy tube with a sensor according to a second embodiment.
  • FIG. 5 is a schematic diagram illustrating a configuration in which a conductive sensor is installed in the dummy tube with the sensor according to the second embodiment.
  • a dummy tube 40 with a sensor of the embodiment (hereinafter, referred to as “dummy tube”) is filled with a filling liquid 43 in which an electrically conductive medium is contained in the heat medium from a heat medium line.
  • a conductive sensor 41 a tip end 41 a of which is immersed in the filling liquid 43 , is provided to be sealed by a seal 42 .
  • the dummy tubes 40 with the sensor provided with the conductive sensor 41 are installed at a plurality of locations of a part where it is predicted that the wear is likely to occur by pre-simulation.
  • the dummy tube 40 with the sensor is filled with the filling liquid 43 containing the electrically conductive medium and is sealed by the seal 42 .
  • the conductive sensor 41 senses a non-conductive state, and notifies the alarm to a remote monitoring system to inform the abnormality of the dummy tube.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Ecology (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Treating Waste Gases (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US14/004,625 2011-03-31 2012-02-13 Heat exchanger and method for estimating remaining life of heat exchanger Abandoned US20130340976A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2011080429A JP5773708B2 (ja) 2011-03-31 2011-03-31 熱交換器及び熱交換器の余寿命推定方法
JP2011-080429 2011-03-31
PCT/JP2012/053271 WO2012132587A1 (fr) 2011-03-31 2012-02-13 Échangeur de chaleur et procédé pour estimer une durée de vie restante d'échangeur de chaleur

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US20130340976A1 true US20130340976A1 (en) 2013-12-26

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US (1) US20130340976A1 (fr)
EP (1) EP2693154A4 (fr)
JP (1) JP5773708B2 (fr)
WO (1) WO2012132587A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015002966A1 (fr) 2013-07-01 2015-01-08 Knew Value, LLC Dispositif d'essai d'échangeur de chaleur
US10234361B2 (en) 2013-07-01 2019-03-19 Knew Value Llc Heat exchanger testing device
US10421053B2 (en) 2016-12-08 2019-09-24 Ihi Corporation Heat treatment device
US11031312B2 (en) 2017-07-17 2021-06-08 Fractal Heatsink Technologies, LLC Multi-fractal heatsink system and method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6567838B2 (ja) * 2015-02-26 2019-08-28 株式会社荏原製作所 液体ポンプのメインテナンス・スケジューラ
JP6852125B2 (ja) * 2019-08-01 2021-03-31 株式会社荏原製作所 液体ポンプのメインテナンス・スケジューラ

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US4762168A (en) * 1985-11-28 1988-08-09 Sumitomo Light Metal Industries, Ltd. Condenser having apparatus for monitoring conditions of inner surface of condenser tubes
US4779453A (en) * 1987-11-18 1988-10-25 Joram Hopenfeld Method for monitoring thinning of pipe walls
US4912418A (en) * 1987-06-26 1990-03-27 Pfaudler-Werke Ag Method and device for detecting the location of a fault within a dielectric layer of an electrically conducting pipe
US5165386A (en) * 1990-10-03 1992-11-24 Veg-Gasinstituut N.V. Compact gas-fired air heater
US5353653A (en) * 1990-05-10 1994-10-11 Kabushiki Kaisha Toshiba Heat exchanger abnormality monitoring system
US20020134161A1 (en) * 2001-03-22 2002-09-26 The Regents Of The University Of California Guided acoustic wave inspection system
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US20100229553A1 (en) * 2009-03-12 2010-09-16 General Electric Company Condenser for power plant
US20120089346A1 (en) * 2010-10-12 2012-04-12 Chevron U.S.A. Inc. Prediction of remaining life in a heat exchanger

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JPH11304138A (ja) 1998-04-21 1999-11-05 Mitsubishi Heavy Ind Ltd ガス・ガスヒータ
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Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877517A (en) * 1973-07-23 1975-04-15 Peerless Of America Heat exchangers
US4762168A (en) * 1985-11-28 1988-08-09 Sumitomo Light Metal Industries, Ltd. Condenser having apparatus for monitoring conditions of inner surface of condenser tubes
US4912418A (en) * 1987-06-26 1990-03-27 Pfaudler-Werke Ag Method and device for detecting the location of a fault within a dielectric layer of an electrically conducting pipe
US4779453A (en) * 1987-11-18 1988-10-25 Joram Hopenfeld Method for monitoring thinning of pipe walls
US5353653A (en) * 1990-05-10 1994-10-11 Kabushiki Kaisha Toshiba Heat exchanger abnormality monitoring system
US5165386A (en) * 1990-10-03 1992-11-24 Veg-Gasinstituut N.V. Compact gas-fired air heater
US20020134161A1 (en) * 2001-03-22 2002-09-26 The Regents Of The University Of California Guided acoustic wave inspection system
US20070240862A1 (en) * 2006-04-18 2007-10-18 Mustang Engineering, L.P. Air-heated heat exchanger
US20100229553A1 (en) * 2009-03-12 2010-09-16 General Electric Company Condenser for power plant
US20120089346A1 (en) * 2010-10-12 2012-04-12 Chevron U.S.A. Inc. Prediction of remaining life in a heat exchanger

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015002966A1 (fr) 2013-07-01 2015-01-08 Knew Value, LLC Dispositif d'essai d'échangeur de chaleur
EP3017289A4 (fr) * 2013-07-01 2017-03-15 Knew Value LLC Dispositif d'essai d'échangeur de chaleur
US9778147B2 (en) 2013-07-01 2017-10-03 Knew Value, LLC Heat exchanger testing device
US10234361B2 (en) 2013-07-01 2019-03-19 Knew Value Llc Heat exchanger testing device
US10421053B2 (en) 2016-12-08 2019-09-24 Ihi Corporation Heat treatment device
EP3552697A4 (fr) * 2016-12-08 2020-05-20 IHI Corporation Dispositif de traitement thermique
US11031312B2 (en) 2017-07-17 2021-06-08 Fractal Heatsink Technologies, LLC Multi-fractal heatsink system and method
US11670564B2 (en) 2017-07-17 2023-06-06 Fractal Heatsink Technologies LLC Multi-fractal heatsink system and method

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EP2693154A4 (fr) 2015-07-15
JP5773708B2 (ja) 2015-09-02
JP2012215335A (ja) 2012-11-08
WO2012132587A1 (fr) 2012-10-04
EP2693154A1 (fr) 2014-02-05

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