WO2016139837A1 - 貫流ボイラの火炉壁管の洗浄方法 - Google Patents

貫流ボイラの火炉壁管の洗浄方法 Download PDF

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Publication number
WO2016139837A1
WO2016139837A1 PCT/JP2015/078193 JP2015078193W WO2016139837A1 WO 2016139837 A1 WO2016139837 A1 WO 2016139837A1 JP 2015078193 W JP2015078193 W JP 2015078193W WO 2016139837 A1 WO2016139837 A1 WO 2016139837A1
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WO
WIPO (PCT)
Prior art keywords
cleaning
scale
furnace wall
washing
boiler
Prior art date
Application number
PCT/JP2015/078193
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English (en)
French (fr)
Japanese (ja)
Inventor
馬渡　憲次
宏樹 大久保
翔 下田
Original Assignee
三菱日立パワーシステムズ株式会社
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.)
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Application filed by 三菱日立パワーシステムズ株式会社 filed Critical 三菱日立パワーシステムズ株式会社
Priority to SG11201706388PA priority Critical patent/SG11201706388PA/en
Priority to CN201580075312.1A priority patent/CN107208879B/zh
Publication of WO2016139837A1 publication Critical patent/WO2016139837A1/ja

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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
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/52—Washing-out devices
    • 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
    • F22B37/56—Boiler cleaning control devices, e.g. for ascertaining proper duration of boiler blow-down
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents

Definitions

  • the present disclosure relates to a method of cleaning a furnace wall tube of a once-through boiler.
  • Patent Document 1 discloses chemical cleaning comprising an acid cleaning step of dissolving and removing scale with an acid (inorganic acid or organic acid), a subsequent water cleaning step, and a subsequent rustproofing step. There is. In the acid washing step, the acid solution is circulated to the boiler.
  • Patent Document 2 discloses a method of cleaning a natural circulation drum type boiler having a coal saving device, a furnace and a heater.
  • a cleaning liquid to which a dispersant is added is injected from the cleaning system temporarily installed in the economizer excluding the heater and the boiler including the furnace into the boiler, it is not possible to hold the cleaning liquid in the boiler. Bubbling by injecting an active gas.
  • Patent Document 3 discloses a powder scale discharge method including a water filling step, a pressing step, and a pressure reducing step.
  • the water filling step is a step of supplying water to the space to be cleaned, such as an evaporation pipe, with the cleaning fluid into which the microbubbles have been introduced, for water filling.
  • the pressurizing step after leaving the state of the water filling step for a predetermined time, the cleaning fluid pressure in the closed space is increased to increase the cleaning fluid pressure, thereby contracting the microbubbles in the cleaning fluid to achieve relative Small micro bubbles and nano bubbles.
  • the depressurization step is to expand the bubbles in the cleaning fluid in the form of relatively small microbubbles and nanobubbles by contracting in the pressurization step.
  • JP 2012-24735 A JP-A-8-105602 JP, 2014-142154, A
  • Patent Documents 1 to 3 require a long time to clean the inner surface of the furnace wall tube, which increases the construction cost and extends the construction period.
  • At least one embodiment of the present invention aims to provide a method of cleaning a furnace wall tube of a once-through boiler capable of shortening the cleaning time.
  • a method of cleaning a furnace wall tube of a once-through boiler according to at least one embodiment of the present invention, A method for cleaning a furnace wall tube of a once-through boiler, wherein oxygen treatment is applied to a water supply system, Of the autoxidized scale and the powder scale formed on the inner surface of the furnace wall tube, the powder scale having a thermal conductivity lower than that of the autoxidized scale is selectively removed by chemical cleaning.
  • the powder scale having a thermal conductivity lower than that of the autoxidized scale is selectively removed by chemical cleaning. Therefore, the cleaning time can be shortened compared to the case of removing all of the autoxidized scale and the powder scale as in the prior art. In addition, since the autoxidized scale is not removed, the cleaning solution will not damage the inner surface of the furnace wall tube.
  • a cleaning test step for determining cleaning conditions of the chemical cleaning for selectively removing the powder scale for selectively removing the powder scale; And the washing step of selectively removing the powder scale under the washing conditions determined in the washing test step.
  • acid cleaning and chelate cleaning are effective for chemical cleaning, but when the cleaning conditions are high concentration, the cleaning temperature conditions are high temperatures, and the cleaning time conditions are long, the cleaning power is It is too strong to partially damage the self-oxidizing scale, and there are concerns about heat transfer inhibition due to floating of the self-oxidizing scale and corrosion due to the cleaning liquid remaining on the floating portion.
  • the cleaning conditions include at least one of a cleaning solution composition condition, a cleaning solution concentration condition, a cleaning temperature condition, and a cleaning time condition.
  • the washing conditions include at least one of the washing liquid composition conditions, the washing liquid concentration conditions, the washing temperature conditions or the washing time conditions, the thermal conductivity is higher than that of the self-oxidizing scale under appropriate washing conditions. Powder scale can be selected and removed efficiently.
  • the cleaning test process chemically cleans a test body constituted by a part of the furnace wall tube of the once-through boiler to be cleaned or a sample imitating the furnace wall tube, and the cleaning condition is capable of selectively removing the powder scale.
  • a test body constituted by a part of the furnace wall tube of the once-through boiler to be cleaned or a sample imitating the furnace wall tube can be chemically cleaned to selectively remove the powder scale. Since the cleaning conditions are determined, the cleaning conditions suitable for each of the flow-through boilers having different operating environments can be determined.
  • the particle concentration in the washing liquid used for chemical washing of the test body is monitored to determine the completion timing of the selective removal of the powder scale, and the washing condition is determined based on the completion timing.
  • the particle concentration in the washing liquid used for chemical washing of the test body is monitored to determine the completion timing of the selective removal of the powder scale, and the washing condition is determined based on the completion timing. Therefore, the washing conditions can be determined qualitatively.
  • the timing at which the increase rate of the particle concentration is less than a threshold is defined as the completion timing.
  • the timing at which the rate of increase of the particle concentration is less than the threshold is taken as the completion timing, so that the washing conditions can be determined quantitatively.
  • a method of cleaning a furnace wall tube of a once-through boiler capable of shortening the cleaning time.
  • a representation representing a relative or absolute arrangement such as “in a direction”, “along a direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” is strictly Not only does it represent such an arrangement, but also represents a state of relative displacement with an angle or distance that allows the same function to be obtained.
  • the expression expressing a shape such as a quadrilateral shape or a cylindrical shape not only represents a shape such as a rectangular shape or a cylindrical shape in a geometrically strict sense, but also an uneven portion The shape including a chamfer etc. shall also be expressed.
  • FIG. 1 is a conceptual view showing a schematic configuration of a thermal power plant 1 to which oxygen treatment is applied to a boiler water supply system.
  • the method of cleaning the furnace wall tube 5 of the once-through boiler is a method of cleaning the furnace wall tube 5 of the once-through boiler in which oxygen treatment is applied to the water supply system.
  • the thermal power plant 1 to which oxygen treatment is applied to the boiler water supply system includes a turbine condenser 11, a condensate pump 12, a condensate processing unit 13, a condensate pressure pump 14, and a low pressure feedwater heater 15.
  • the deaerator 16, the boiler feed pump 17, the high pressure feed heater 18, the furnace economizer 19, the super heater 20, and the reheater 21 are provided.
  • the furnace economizer 19 includes an economizer 22, a furnace 23, a gas-liquid separator 24, a gas-liquid separation tank 25, and a boiler circulation pump 26.
  • FIG. 2 is a conceptual diagram showing a state in which the cleaning and circulation route 3 is installed in the thermal power plant 1 shown in FIG.
  • the scale S in which the cleaning solution circulates from the economizer 22 to the gas-liquid separator 24 and adheres to the inner surface of the furnace wall pipe 5 It is to be cleaned and includes a buffer tank 31, a circulation pump 32, a heater 33, and a waste tank 34. These are mutually connected by temporary piping 35.
  • the cleaning liquid is stored in the buffer tank 31, and the cleaning liquid stored in the buffer tank 31 is delivered by the circulation pump 32.
  • the cleaning liquid delivered by the circulation pump 32 is heated by the heater 33, passes through the economizer 22, the furnace 23, and the gas-liquid separator 24, and is collected in the buffer tank 31.
  • the cleaning liquid stored in the buffer tank 31 circulates from the economizer 22 to the gas-liquid separator 24 and cleans and removes the scale S adhering to and deposited on the inner surface of the furnace wall pipe 5 (chemical cleaning) .
  • FIG. 3 is a schematic view showing an outline of the furnace wall pipe 5 in which the scale S is adhered and deposited on the inner surface.
  • the scale S adhering to and deposited on the inner surface of the furnace wall pipe 5 is configured to include the autoxidation scale HS and the powder scale PS.
  • the self-oxidizing scale HS is deposited on the inner surface of the furnace wall tube 5 to form a dense layer, and the powder scale PS is porous with a small particle diameter and attached to the surface of the self-oxidizing scale HS.
  • FIG. 4 is a diagram showing the relationship between the thickness of the scale S and the metal temperature.
  • the increase in metal temperature is largely influenced by the thickness of the powder scale PS, and is small by the thickness of the autoxidized scale HS.
  • the metal temperature of the furnace wall pipe 5 is controlled below the control temperature, but the self-oxidizing scale HS does not grow to a predetermined value (hereinafter referred to as “HS thickness limit value”), and the metal of the furnace wall pipe 5 The temperature never reaches the control temperature.
  • FIG. 5 is a view showing the relationship between the operation time of the once-through boiler and the thickness of the self-oxidation scale HS.
  • the growth rate of the self-oxidation scale HS is relatively slow, and the thickness is equal to or less than the HS thickness limit value even after about 10 years. Therefore, even if the self-oxidation scale HS is left as it is, the metal temperature of the furnace wall pipe 5 does not reach the control temperature in about 10 years.
  • powder scale PS has a smaller thermal conductivity than autoxidized scale HS, and if the thickness grows to a predetermined value (hereinafter referred to as "PS thickness control value"), the metal temperature of furnace wall pipe 5 reaches the control temperature Therefore, the thickness of the powder scale PS is required to be controlled to the PS thickness management value or less.
  • PS thickness control value a predetermined value
  • powder scale PS is brought in from boiler feed water, adheres and grows, and depends on the water quality of the feed water. Therefore, depending on the quality of the water supplied, the furnace wall pipe 5 may reach the control temperature in two years, or may reach the control temperature in 10 years.
  • the thermal conductivity of the autoxidation scale HS and the powder scale PS generated on the inner surface of the furnace wall tube 5 is higher than the autoxidation scale HS.
  • the low rate powder scale PS is selectively removed by chemical cleaning.
  • the cleaning solution is performed until the powder scale PS having a thermal conductivity lower than that of the autoxidized scale HS is selectively removed by chemical cleaning among the scales S deposited and deposited on the inner surface of the furnace wall pipe 5. Circulate.
  • the self-oxidation scale HS and the powder scale PS generated on the inner surface of the furnace wall tube 5 are more than the self-oxidation scale HS. Since the powder scale PS having low thermal conductivity is selectively removed by chemical cleaning, the cleaning time can be shortened as compared with the case of removing all of the autoxidized scale HS and the powder scale PS as in the prior art. In addition, since the self-oxidation scale HS is not removed, the cleaning solution will not damage the inner surface of the furnace wall tube 5.
  • FIG. 6 is a conceptual view showing a presumed structure of the furnace wall pipe 5 of the once-through boiler in which the autoxidation scale HS and the powder scale PS are generated on the inner surface.
  • the surface layer of the powder scale PS has weak adhesion and can be partially removed by washing with water.
  • the powder scale PS and the autoxidation scale HS it has an adhesion which is difficult to remove by washing with water.
  • the method of cleaning the furnace wall tube 5 of the once-through boiler includes a cleaning test step and a cleaning step.
  • the washing test step is for obtaining washing conditions for chemical washing for selectively removing the powder scale PS, and the washing step is for selectively removing the powder scale PS under the washing conditions obtained in the washing test step.
  • the cleaning method of the furnace wall tube 5 of the once-through boiler according to some embodiments described above, chemical cleaning conditions for selectively removing the powder scale PS are determined, and the powder scale PS is selectively eliminated under the determined cleaning conditions. Therefore, the powder scale PS having a thermal conductivity lower than that of the autoxidation scale HS can be efficiently selected and removed among the autoxidation scale HS and the powder scale PS.
  • FIG. 7 is a view showing washing conditions capable of selectively removing powder scale.
  • the cleaning conditions include at least one of a cleaning solution composition condition, a cleaning solution concentration condition, a cleaning temperature condition, and a cleaning time condition.
  • an organic acid such as citric acid or hydroxy acid is used for the composition of the cleaning solution.
  • the concentration of the cleaning solution is 3% to 10%, and the number of times of cleaning depends on the amount of the scale S adhering to the inner surface of the furnace wall tube 5.
  • the temperature of the washing solution is 80 ° C. to 90 ° C., and the washing time is about 6 hours to 10 hours.
  • a typical chemical cleaning procedure is suitable for removing all the scale S deposited and adhered to the inner surface of the furnace wall tube 5, but is not suitable for selectively removing the powder scale PS. That is, in a typical chemical cleaning procedure, not only powder scale PS but also autoxidation scale HS will be removed.
  • the cleaning condition 1 is a reduction in the temperature of the cleaning solution, and the composition of the cleaning solution, the concentration of the cleaning solution, and the cleaning time are the same as the above-described typical chemical cleaning procedures.
  • the temperature of the cleaning solution is, for example, normal temperature, which is advantageous in that it is not necessary to heat the cleaning solution.
  • the washing under the washing condition 1 suppresses the damage of the autoxidized scale HS and enables selective removal of the powder scale PS.
  • the washing condition 2 is obtained by shortening the washing time, and the composition of the washing solution, the concentration of the washing solution, and the temperature of the washing solution are the same as the typical chemical washing procedure described above.
  • the washing time is, for example, one hour, which is advantageous in that the washing is completed in a short time.
  • the washing under the washing condition 2 suppresses the damage of the autoxidized scale HS and enables selective removal of the powder scale PS.
  • the cleaning condition 3 is a reduction in the concentration of the cleaning solution, and the composition of the cleaning solution, the temperature of the cleaning solution, and the cleaning time are the same as the above-described typical chemical cleaning procedures.
  • the concentration of the washing solution is, for example, less than 3%, which is advantageous in that the amount of washing solution (stock solution) is reduced.
  • the washing under the washing condition 3 suppresses the damage of the autoxidized scale HS and enables selective removal of the powder scale PS.
  • the washing condition 4 is an arbitrary modification of the above-mentioned typical chemical washing procedure, and the composition of the washing solution uses an organic acid such as EDTA, malonic acid or hydroxyacetic acid.
  • the concentration of the cleaning solution is 3% to 10% or less than 3%, and the number of cleanings depends on the amount of the scale S adhering to the inner surface of the furnace wall tube 5, but the cleaning is usually performed multiple times.
  • the temperature of the cleaning solution is 80 ° C. to 90 ° C., or normal temperature, and the cleaning time is about 6 hours to 10 hours, or less than 1 hour.
  • the washing under the washing condition 4 suppresses the damage of the autoxidized scale HS and enables selective removal of the powder scale PS.
  • the cleaning conditions include at least one of cleaning solution conditions, cleaning solution concentration conditions, cleaning temperature conditions, or cleaning time conditions
  • the heat conduction is higher than that of the self-oxidizing scale HS under appropriate cleaning conditions.
  • the powder scale PS with a low rate can be selectively removed.
  • FIG. 8 is a conceptual view showing an outline of a washing test apparatus for obtaining washing conditions capable of selectively removing powder scale PS.
  • an inorganic acid hydrochloric acid
  • an organic acid citric acid, hydroxyacetic acid, malonic acid, etc.
  • a chelating agent can be used as a washing solution for selectively removing the powder scale PS.
  • the cleaning test process chemically cleans a sample TP constituted by a part of the furnace wall pipe 5 of the once-through boiler to be cleaned or a sample imitating the furnace wall pipe 5, and the powder scale Determine washing conditions that can selectively remove PS.
  • the scale dissolution test apparatus 6 is used to test a test body TP which constitutes a part of the furnace wall pipe 5 of the once-through boiler to be cleaned.
  • the scale dissolution test apparatus 6 includes a warm tank 61, a circulation pump 62, a circulation tank 63, and a particle counter 64.
  • the test body TP is immersed in the hot tank 61, and the cleaning liquid stored in the circulation tank 63 is fed out by the circulation pump 62.
  • the cleaning fluid delivered by the circulation pump 62 passes through the test body TP and is collected in the circulation tank 63.
  • the cleaning liquid stored in the circulation tank 63 circulates the test body TP, and cleans the scale S (powder scale PS) attached to the inner surface of the test body TP.
  • the test body TP constituted by a part of the furnace wall pipe 5 of the once-through boiler to be cleaned or the sample imitating the furnace wall pipe is chemically cleaned Since the washing conditions capable of selectively removing the powder scale PS are determined, the washing conditions suitable for each of the through-flow boilers having different operating environments can be determined.
  • FIG. 9 is a diagram showing the relationship between the cleaning time and the particle concentration in the cleaning liquid and the rate of increase of the particle concentration.
  • the relationship shown in FIG. 9 is merely an example.
  • Powder scale is an iron oxide called hematite (Fe 2 O 3 ), which is less soluble compared to the autoxidized scale HS, and it is difficult to completely dissolve it even by chemical cleaning, and its particles are in the cleaning solution. Suspend in floating or stagnant areas. In addition, as the cleaning time increases, the number of particles suspended in the cleaning solution increases, and eventually stagnates in the retention portion.
  • hematite Fe 2 O 3
  • the completion timing of the selective removal of the powder scale PS is determined by monitoring the particle concentration in the cleaning liquid used for the chemical cleaning of the test object TP, and the completion timing is determined. Determine the washing conditions based on the above.
  • the particle concentration is monitored using the particle counter 64 to determine the completion timing of the selective removal of the powder scale PS, and the cleaning time is determined based on the completion timing.
  • the particle diameter of the particles to be monitored using the particle counter 64 is set to a predetermined value (for example, 10 ⁇ m), and the disturbance due to the foreign matter or the exfoliation sludge from the self-oxidation scale HS is eliminated.
  • the particle concentration is the number of particles in the cleaning solution, and the increase rate of the particle concentration is ⁇ (number of particles at n time)-(number of particles at n-1 hour) ⁇ / (particle at n time) It is calculated by the following equation) * 100.
  • the particle concentration generally increases as the washing time increases, and the increase rate of the particle concentration decreases.
  • the selective removal of powder scale PS is completed.
  • the timing is determined, and the cleaning condition (cleaning time) is determined based on the completion timing.
  • the completion timing of the selective removal of the powder scale PS is judged by monitoring the particle concentration in the cleaning liquid used for the chemical cleaning of the test object TP, and completed. Since the cleaning conditions are determined based on the timing, the cleaning conditions can be determined qualitatively.
  • the timing at which the increase rate of the particle concentration is less than the threshold is taken as the completion timing.
  • the threshold is 10% / time
  • the timing at which the increase rate of the particle concentration is less than 10% / hour is the completion timing.
  • the cleaning conditions can be quantitatively determined.
  • the particle concentration is monitored using the particle counter 64 in the embodiment illustrated in FIG. 8, a simplified monitoring method performed at the time of plant construction or plant startup may be used. Specifically, after filtering sample water using a membrane filter, a method may be used to estimate the iron concentration by the color of the filter. In this case, the timing at which the increase in the concentration of particles contained in the cleaning liquid is not recognized is taken as the completion timing.
  • the present invention is not limited to the above-described embodiments, and includes the embodiments in which the above-described embodiments are modified or the embodiments in which these embodiments are appropriately combined.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Cleaning In General (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Baking, Grill, Roasting (AREA)
PCT/JP2015/078193 2015-03-04 2015-10-05 貫流ボイラの火炉壁管の洗浄方法 WO2016139837A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SG11201706388PA SG11201706388PA (en) 2015-03-04 2015-10-05 Method for cleaning furnace wall tube of once-through boiler
CN201580075312.1A CN107208879B (zh) 2015-03-04 2015-10-05 直流锅炉的火炉壁管的清洗方法

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JP2015042501A JP6363037B2 (ja) 2015-03-04 2015-03-04 貫流ボイラの火炉壁管の洗浄方法
JP2015-042501 2015-03-04

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CN (1) CN107208879B (zh)
SG (1) SG11201706388PA (zh)
TW (1) TWI593929B (zh)
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Cited By (1)

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JP2020067240A (ja) * 2018-10-25 2020-04-30 東京電力ホールディングス株式会社 ボイラの化学洗浄方法

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JP6774148B2 (ja) * 2017-04-12 2020-10-21 三菱パワー株式会社 スケール除去方法及びスケール除去装置
JP7051474B2 (ja) * 2018-02-09 2022-04-11 三菱重工業株式会社 化学洗浄装置及びそれを用いた化学洗浄方法

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JP5721888B1 (ja) * 2014-07-04 2015-05-20 三菱日立パワーシステムズ株式会社 化学洗浄方法及び化学洗浄装置

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JP2011227011A (ja) * 2010-04-23 2011-11-10 Babcock-Hitachi Co Ltd スケール熱伝導率測定装置
JP2014153033A (ja) * 2013-02-13 2014-08-25 Babcock-Hitachi Co Ltd ボイラ装置の保全方法
WO2014162992A1 (ja) * 2013-04-02 2014-10-09 栗田工業株式会社 蒸気発生設備のスケール除去方法
JP5721888B1 (ja) * 2014-07-04 2015-05-20 三菱日立パワーシステムズ株式会社 化学洗浄方法及び化学洗浄装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020067240A (ja) * 2018-10-25 2020-04-30 東京電力ホールディングス株式会社 ボイラの化学洗浄方法
JP7119898B2 (ja) 2018-10-25 2022-08-17 東京電力ホールディングス株式会社 ボイラの化学洗浄方法

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JP6363037B2 (ja) 2018-07-25
TWI593929B (zh) 2017-08-01
CN107208879B (zh) 2019-05-03
SG11201706388PA (en) 2017-09-28
CN107208879A (zh) 2017-09-26
JP2016161255A (ja) 2016-09-05
TW201636557A (zh) 2016-10-16

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