WO2020137496A1 - Procédé et appareil de nettoyage et d'entretien d'installation de chaudière - Google Patents

Procédé et appareil de nettoyage et d'entretien d'installation de chaudière Download PDF

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Publication number
WO2020137496A1
WO2020137496A1 PCT/JP2019/048147 JP2019048147W WO2020137496A1 WO 2020137496 A1 WO2020137496 A1 WO 2020137496A1 JP 2019048147 W JP2019048147 W JP 2019048147W WO 2020137496 A1 WO2020137496 A1 WO 2020137496A1
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Prior art keywords
cleaning
ammonia
neutral
based compound
solution
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PCT/JP2019/048147
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English (en)
Japanese (ja)
Inventor
貴行 和田
陽一 真保
良典 野口
瑞希 大塚
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三菱日立パワーシステムズ株式会社
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Priority to KR1020217004725A priority Critical patent/KR20210034040A/ko
Publication of WO2020137496A1 publication Critical patent/WO2020137496A1/fr

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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
    • 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
    • F22B37/50—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
    • 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
    • F22B37/54—De-sludging or blow-down 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

Definitions

  • the present disclosure relates to a cleaning storage device for cleaning and storing a boiler plant and a cleaning storage method thereof.
  • a large amount of pure water is used to replace hydrazine water with operating water.
  • Wastewater treatment is required to dispose of hydrazine water and operating water discharged during replacement work. Therefore, replacement of hydrazine water with operating water becomes a factor that increases the load on the wastewater treatment facility.
  • hydrazine is a carcinogen, so there is a problem in wastewater treatment when switching to operating water. Therefore, without using hydrazine, it is possible to divert the stored water to operating water without draining the stored water, and it is preferable to use a storage method for a boiler plant that can prevent corrosion of plant components for several days or longer. Has become.
  • Patent Document 3 discloses a method for cleaning an exhaust heat recovery boiler, in which cleaning is performed at a low temperature (without heating/normal temperature) using a cleaning liquid containing a neutral rust remover.
  • Patent Document 4 discloses a cleaning method in which a heated cleaning liquid is circulated in the heat transfer tube in a state where the exhaust gas supply port and the exhaust gas outlet of the exhaust heat recovery boiler are closed.
  • Exhaust heat recovery boiler consists of multiple steam drums and evaporators.
  • a cleaning liquid from a cleaning facility 30 is put into a economizer 31, a steam drum 32, and an evaporator 33 from a water supply system to perform cleaning.
  • Fig. 13 shows a process diagram of a conventional chemical cleaning method.
  • a temporary system is connected to the cleaning target (S31).
  • S32 chemically cleaning
  • S33 washed with water
  • the above rustproof treatment is carried out at 80°C to 90°C by adding hydrazine water in order to prevent rusting during the period from washing to normal operation.
  • the rustproofing treatment at a low temperature as in Patent Document 3 does not form a sufficient rustproof film.
  • rust may occur on the inner surface of the heat transfer tube after blowing the anticorrosion treatment liquid. Rust on the inner surface of the heat transfer tube is not preferable from the viewpoint of cleaning work quality, water quality during operation, and facility reliability.
  • An object of the present invention is to provide a cleaning storage method and a cleaning storage apparatus for a boiler plant that can be used.
  • the cleaning storage method and cleaning storage apparatus of the boiler plant of the present disclosure adopt the following means.
  • a first aspect of the present disclosure includes a step of neutrally cleaning a cleaning target site having scale attached thereto at room temperature with a neutral cleaning solution containing a rust remover, and a pH of 9.
  • a method for cleaning and storing a boiler plant which includes a step of circulating an ammonia-based compound aqueous solution at room temperature of 8 or more and a step of blowing the ammonia-based compound aqueous solution from the cleaning target site.
  • the temperature rising facility and the preheating process of the cleaning liquid are unnecessary, and it is not necessary to monitor the temperature drop of the cleaning liquid due to cooling during the cleaning process. This makes it possible to reduce the cleaning cost and cleaning time.
  • the "normal temperature” means about room temperature, and is a temperature at which preheating or heating is not performed from the outside. Specifically, it is 5°C to 50°C, more preferably 15°C to 30°C.
  • ammonia-based compound aqueous solution having a pH of 9.8 or higher is circulated on the surface of the base material of the cleaning target site after the scale is removed, the ammonia-based compound aqueous solution is blown from the cleaning target site, and the surface contains ammonia-containing water. Covered with a membrane. As a result, it becomes possible to suppress rusting until the start of operation.
  • the main component of the ammonia-containing water film is ammonia water, which is the same as the feed water treatment chemical used when operating the boiler plant. From this, it is not necessary to remove the ammonia-containing water film at the start of the operation, and therefore the operation can be started as it is after the boiler plant is stored. As a result, working time can be shortened and cost can be reduced. Furthermore, since rusting can be suppressed without using hydrazine, it is excellent in environmental friendliness.
  • the neutral cleaning solution in the step of neutral cleaning, is circulated in the cleaning target site, iron ions in the circulated neutral cleaning solution are analyzed, and the neutral cleaning solution is analyzed. It is desirable to finish the neutral cleaning after confirming that the change in iron ion concentration in the cleaning liquid shows a saturation tendency.
  • scale components include calcium (Ca), aluminum (Al), copper (Cu), etc. Since Ca, Al, and Cu have low solubilities in the vicinity of neutrality, these scale components may not be completely dissolved/removed by low-temperature cleaning using a neutral rust remover. The scale that cannot be removed may remain as sludge in the system. The residual sludge can be discharged to the outside of the system to some extent by blowing the cleaning liquid or washing with water after cleaning, but it is difficult to discharge the whole sludge and may remain in the system.
  • the heat transfer tubes are arranged horizontally and the length is large at 20 m class, and it is difficult to discharge sludge at the flow velocity of the water flow at the time of cleaning and discharging (blowing). Particular attention is required.
  • the remaining sludge becomes a factor of lowering the heat transfer performance of the heat transfer tube and causing corrosion due to sludge-containing components.
  • the acidic cleaning solution in the step of performing the acid cleaning, is circulated in the cleaning target site, iron ions in the circulated acidic cleaning solution are analyzed, and iron in the acidic cleaning solution is analyzed. It is desirable to finish the acid cleaning after confirming that the change in ion concentration shows a saturation tendency.
  • the acidic cleaning liquid of the extruding blow is After blowing almost the entire amount and circulating the aqueous ammonia compound solution in the cleaning target site, the pH of the aqueous ammonia compound compound is analyzed, and the extrusion blow and the ammonia are analyzed until the analyzed pH becomes a reference value or more. It is desirable to continue the circulation of the aqueous system compound solution.
  • the acidic cleaning liquid is extruded and replaced with an aqueous ammonia compound solution.
  • the method further comprises a step of extruding and blowing the neutral cleaning liquid using the aqueous solution of the ammonia-based compound, and in the step of extruding and blowing, the Blowing almost the entire amount of the cleaning liquid, after circulating the ammonia-based compound aqueous solution in the cleaning target site was analyzed for components derived from the rust remover in the ammonia-based compound aqueous solution, of the components derived from the analyzed rust remover It is desirable to continue the extrusion blow and the circulation of the aqueous solution of ammonia compound until the concentration becomes equal to or lower than the reference value.
  • the neutral cleaning solution is extruded and replaced with an aqueous ammonia compound solution.
  • a solid vaporizable ammonia compound can be introduced into the site to be cleaned.
  • the solid of the vaporizable ammonia compound that has been input is vaporized in the cleaning target site, is quickly diffused, and is taken into the ammonia-containing water film.
  • the ammonia component escapes from the ammonia-containing water film, but the rust preventive effect of the water film can be maintained by introducing the vaporizable ammonia compound solid.
  • At least one of the acidic cleaning liquid and the neutral cleaning liquid may be filtered during circulation.
  • Sludge can be removed by filtering the circulating cleaning solution. As a result, the amount of sludge remaining generated during cleaning can be reduced, and therefore the heat transfer performance of the heat transfer tube due to sludge residue and the risk of corrosion due to sludge-containing components can be reduced.
  • the cleaning target portion may be an evaporator of the exhaust heat recovery boiler.
  • the amount of cleaning liquid used can be suppressed and the amount of drainage can be reduced.
  • a circulation part configured to circulate a fluid in a portion to be cleaned to which scale is attached, and a neutral cleaning liquid supply for supplying a neutral cleaning liquid containing a rust remover to the circulation part.
  • an ammonia-based compound aqueous solution supply section for supplying an ammonia-based compound aqueous solution containing an ammonia-based compound having a pH of 9.8 or more to the circulation section, and a blow channel for discharging the ammonia-based compound aqueous solution from the circulation section.
  • a cleaning and storage device for a boiler plant equipped with the same.
  • the circulation unit has a circulation flow path whose both ends are connected to an inlet/outlet of the cleaning target site, a pump provided in the middle of the circulation flow path, and the downstream side of the pump. And a filtering device provided in the middle of the circulation flow path.
  • one end is connected to at least one of the circulation part, the inlet and the outlet of the cleaning target site, and the other end is the acidic cleaning liquid supply part, the neutral cleaning liquid supply part, and the ammonia-based compound aqueous solution. You may further provide the blow flow path connected to at least one of the supply parts.
  • the blow liquid can be returned to at least one of the acidic cleaning liquid supply unit, the neutral cleaning liquid supply unit, and the ammonia-based compound aqueous solution supply unit, the installation of the drain tank can be omitted.
  • rust prevention treatment is performed on a cleaning target portion of a boiler at low cost and in a short time, and a boiler plant cleaning storage method and cleaning storage that can store a boiler It becomes a device.
  • FIG. 3 is a schematic diagram showing changes in the cleaning time and the Fe ion concentration in the neutral cleaning liquid in the first embodiment. It is a schematic diagram of an ammonia-containing water film. It is a schematic diagram at the time of specific part washing. It is process drawing of the cleaning storage method which concerns on 2nd Embodiment. It is a graph which illustrates the sludge amount in acid cleaning and neutral cleaning in 2nd Embodiment.
  • FIG. 7 is a schematic diagram of changes in the cleaning time and the Fe ion concentration in the cleaning liquid in the second embodiment.
  • the following embodiments exemplify a method for cleaning and storing an exhaust heat recovery boiler.
  • the inside of the cleaning target device (cleaning target portion) is cleaned using a cleaning liquid at room temperature without heating.
  • "Normal temperature” means about room temperature, and is a temperature at which preheating or heating is not performed from the outside.
  • the “normal temperature” is specifically 5 to 50° C., more preferably 15° C. to 30° C.
  • FIG. 1 shows a process diagram of a method for cleaning and storing a boiler plant according to this embodiment.
  • the cleaning storage method according to the present embodiment includes step 1 (S1) to step 6 (S6) in order.
  • the pH of the neutral cleaning solution containing the rust remover is 4 to 8.
  • the rust remover is a chelating agent, a reducing agent, or a mixture of a chelating agent and a reducing agent, and is an object to be removed that has adhered to the inside of the equipment to be cleaned (for example, a scale containing metal oxides or metal salts, rust hump). Etc.) can be removed.
  • “Rusty humps” are hump-like corrosion products (see JIS Z 0103 1050) that occur on the surface of steel.
  • the neutral cleaning liquid is appropriately adjusted in concentration of the chelating agent, the reducing agent and the corrosion inhibitor so as to obtain a desired cleaning capacity and cleaning time.
  • the chelating agent examples include aminocarboxylic acids such as EDTA, BAPTA, DOTA, EDDS, INN, NTA, DTPA, HEDTA, TTHA, PDTA, DPTA-OH, HIDA, DHEG, GEDTA, CMGA, EDDS, and salts thereof.
  • Carboxylic acid type chelating agents oxycarboxylic acids such as citric acid, gluconic acid, hydroxyacetic acid and salts thereof, oxycarboxylic acid type chelating agents such as ATMP, HEDP, NTMP, PBTC and EDTMP, and salts thereof. It is an organic phosphorus chelating agent such as.
  • the reducing agent examples include various metal ions such as Fe 2+ and Sn 2+ , nitrites such as sodium sulfite, organic compounds such as oxalic acid, formic acid, ascorbic acid and pyrogallol, hydrazine and hydrogen.
  • a corrosion inhibitor may be added to the neutral cleaning liquid.
  • the aqueous ammonia-based compound solution contains the ammonia-based compound at a concentration such that the pH is 9.8 to 11, preferably pH 9.8 to 10.5.
  • the ammonia-based compound is, for example, a volatile amine selected from 2-amino-2-methyl-1-propanol, monoethanolamine, monoisopropanolamine, cyclohexylamine, diethylethanolamine, morpholine, 3-methoxypropylamine, and ammonia. It is a compound.
  • the neutral cleaning solution contains organic phosphoric acid as a chelating agent
  • analyze phosphorus (P) in the aqueous ammonia compound solution can be carried out by the molybdenum blue absorptiometry described in JIS K 0102 Industrial Wastewater Testing Method 46.3 Total Phosphorus, ion chromatography, ICP mass spectrometry or atomic absorption.
  • steps 2 to 5 may be performed only once, or may be performed multiple times.
  • Fig. 2 exemplifies (S2) the amount of sludge (standard value) before and after neutral cleaning.
  • the vertical axis represents the amount of sludge remaining in the equipment to be cleaned.
  • S2 About 90% of sludge can be removed only by neutral cleaning.
  • FIG. 3 shows a schematic diagram of changes in the cleaning time and the Fe ion concentration in the cleaning liquid.
  • the horizontal axis represents the cleaning time
  • the vertical axis represents the Fe ion concentration
  • the broken line represents the transition during neutral cleaning.
  • the neutral cleaning when the cleaning progresses to some extent, the scale to be cleaned is removed, the Fe scale dissolution amount decreases, and the Fe ion concentration change in the cleaning liquid tends to be saturated.
  • the above cleaning and storing method by confirming the saturation tendency of the change in Fe ion concentration and ending each cleaning step, it is possible to avoid continuation of cleaning more than necessary and carry out neutral cleaning in the necessary minimum time. Thereby, extension of each cleaning time can be suppressed.
  • the ammonia-based compound aqueous solution is circulated in the system, so that the ammonia having a high pH (9.8 or more) is applied to the surface of the base material 10 of the cleaning target device.
  • the contained water film 11 is formed (see FIG. 4).
  • the high pH water film portion has a rust preventive effect, and the effect is maintained after the restoration of the cleaning equipment temporary pipe is completed after the aqueous solution of the ammonia compound is blown. Since the pH of the ammonia-containing water film 11 is 9.8 or higher, the rust-preventing effect is obtained even without hydrazine, so that hydrazine is not required and the environment is excellent.
  • ⁇ Ammonia component escapes from the ammonia-containing water film 11 when the restoration process of the temporary connection of the cleaning equipment is prolonged and the opening time becomes long. Therefore, (S6) during the dismantling of the temporary system, a solid substance of an ammonia compound that is vaporizable at room temperature and pressure may be additionally charged into the equipment to be cleaned to supplement the ammonia gas. The introduced ammonia compound is quickly vaporized to generate an ammonia-based gas. Ammonia-based gas diffuses in the system and is dissolved in the ammonia-containing water film. As a result, the pH of the ammonia-containing water film 11 can be maintained at a high level, so that the deterioration of the rust preventive effect of the ammonia-containing water film 11 due to the pH decrease can be reduced.
  • the water film of the aqueous ammonia compound solution or the solids of the ammonia compound remaining at the start of operation is easily dissolved in the operating water.
  • ammonia is used to adjust the pH of the feed water during operation.
  • the ammonia-based compound aqueous solution used for forming the water film in the above embodiment does not need to be removed at the start of operation of the exhaust heat recovery boiler because the main component is ammonia. Therefore, after the exhaust heat recovery boiler is stored, the operation can be started as it is, so that the working time can be shortened, the plant operation rate can be improved, and the chemical cost and the wastewater treatment cost can be reduced.
  • Neutral cleaning solution may be filtered during circulation.
  • the amount of sludge remaining at the time of cleaning can be reduced, and thus the risk of deterioration of heat transfer performance of the heat transfer tube due to sludge remaining and the risk of corrosion generation due to sludge-containing components can be reduced.
  • the cleaning storage method according to the above embodiment is suitable for cleaning the boiler water system of the exhaust heat recovery boiler.
  • the cleaning target equipment requiring cleaning is specified in a specific portion where scale easily adheres (for example, a heat transfer tube of an evaporator where scale easily adheres due to temperature and pressure conditions).
  • the amount of cleaning liquid used and the working time for cleaning can be reduced, which is more preferable.
  • FIG. 6 shows a process diagram of the boiler plant cleaning and storing method according to the present embodiment. This embodiment differs from the first embodiment in that an acid cleaning step is performed before neutral cleaning.
  • the cleaning storage method according to the present embodiment includes step 11 (S11) to step 19 (S19) in order.
  • the acidic cleaning liquid is injected from the temporary system to fill the inside of the cleaning target device with the acidic cleaning liquid, the acidic cleaning liquid is circulated in the cleaning target device at room temperature.
  • the wash solution is not warmed during circulation.
  • the acidic cleaning liquid may be an inorganic acid solution or an organic acid solution capable of dissolving Ca, Al, Cu and the like.
  • the pH of the acidic cleaning liquid is preferably 4 or less, more preferably 3 or less. For example, a 1% by mass to 10% by mass aqueous hydrochloric acid solution can be used as the acidic cleaning liquid.
  • Iron ions in the liquid are phenanthroline absorptiometry, flame atomic absorption, electric heating atomic absorption or ICP emission spectrophotometry described in JIS K 0101 Industrial water test method 60 iron (Fe), or boiler of JIS B 8224.
  • Water supply and boiler water-Test method 26 1,10-phenanthroline absorptiometry described in Iron (Fe), 2,4,6-tri-pyridyl-1,3,5-triazine (TPTZ) absorptiometry, flame It can be analyzed by an atomic absorption method, an electric heating atomic absorption method, an ICP emission spectroscopic analysis method, an ICP mass spectrometric method, a sulfosalicyl absorptiometry method, or the like.
  • JIS is an abbreviation for Japanese Industrial Standards.
  • the cleaning from steps 12 to 18 of the above cleaning storage method may be carried out only once or plural times.
  • steps (S11) and (S19) above are omitted.
  • the sludge remaining in the cleaning target device is (S15) neutral cleaning.
  • S15 neutral cleaning.
  • Fig. 7 exemplifies the residual sludge amount (standard value) in (S12) acid cleaning and (S15) neutral cleaning.
  • the vertical axis represents the amount of sludge remaining in the cleaning target device (100 before acid cleaning). As shown in FIG. 2, about 20% of the sludge remains in the acid cleaning at room temperature, but about 70% of the remaining 20% of the sludge could be removed by the neutral cleaning.
  • FIG. 8 shows a schematic diagram of changes in the cleaning time and the Fe ion concentration in the cleaning liquid.
  • the horizontal axis represents the cleaning time
  • the vertical axis represents the Fe ion concentration
  • the solid line represents the transition during acid cleaning
  • the broken line represents the transition during neutral cleaning.
  • the cleaning storage method by confirming the saturation tendency of the Fe ion concentration change and ending each cleaning step, it is possible to avoid excessive cleaning continuity and perform acid cleaning and neutral cleaning in the necessary minimum time. it can. Thereby, extension of each cleaning time can be suppressed.
  • the aqueous ammonia compound solution is circulated in the system, so that the surface of the base material 10 of the cleaning target device has a high pH (9.8).
  • the above-mentioned ammonia-containing water film 11 is formed.
  • the high pH water film portion has a rust preventive effect, and the effect is maintained after the restoration of the cleaning equipment temporary pipe is completed after the aqueous solution of the ammonia compound is blown. Since the pH of the ammonia-containing water film 11 is 9.8 or higher, the rust-preventing effect is obtained even without hydrazine, so that hydrazine is not required and the environment is excellent.
  • ⁇ Ammonia component escapes from the ammonia-containing water film 11 when the restoration process of the temporary connection of the cleaning equipment is prolonged and the opening time becomes long. Therefore, (S19) during the dismantling of the temporary system, a solid substance of a vaporizable ammonia compound at room temperature and normal pressure may be additionally charged into the device to be cleaned to supplement the ammonia gas. The introduced ammonia compound is quickly vaporized to generate an ammonia-based gas. Ammonia-based gas diffuses in the system and is dissolved in the ammonia-containing water film. As a result, the pH of the ammonia-containing water film 11 can be maintained at a high level, so that the deterioration of the rust preventive effect of the ammonia-containing water film 11 due to the pH decrease can be reduced.
  • the water film of the aqueous ammonia compound solution or the solids of the ammonia compound remaining at the start of operation is easily dissolved in the operating water.
  • ammonia is used to adjust the pH of the feed water during operation.
  • the ammonia-based compound aqueous solution used for forming the water film in the above embodiment does not need to be removed at the start of operation of the exhaust heat recovery boiler because the main component is ammonia. Therefore, after the exhaust heat recovery boiler is stored, the operation can be started as it is, so that the working time can be shortened, the plant operation rate can be improved, and the chemical cost and the wastewater treatment cost can be reduced.
  • At least one of the acidic cleaning solution and the neutral cleaning solution may be filtered during circulation.
  • the amount of sludge remaining at the time of cleaning can be reduced, so that the heat transfer performance of the heat transfer tube is reduced due to the sludge remaining and the risk of corrosion generation due to the sludge-containing component can be reduced.
  • the cleaning storage method according to the above embodiment is suitable for cleaning the boiler water system of the exhaust heat recovery boiler.
  • the cleaning target equipment requiring cleaning is specified in a specific portion where scale easily adheres (for example, a heat transfer tube of an evaporator where scale easily adheres due to temperature and pressure conditions).
  • the amount of cleaning liquid used and the working time for cleaning can be reduced, which is more preferable.
  • FIG. 9 is a process diagram of the boiler plant cleaning and storing method according to the present embodiment. This embodiment is different from the first and second embodiments in that the step of acid cleaning is performed after neutral cleaning.
  • the cleaning storage method according to the present embodiment includes step 21 (S21) to step 28 (S28) in order.
  • the reference value is set in advance by a preliminary test. Confirm that the pH of the aqueous ammonia-based compound solution is above the reference value.
  • the reference value is, for example, pH 9.8 or more, which has an anticorrosive effect even without hydrazine.
  • the above steps 22 to 27 may be carried out only once or a plurality of times.
  • FIG. 10 is a schematic diagram of a temporary system (cleaning storage device 2).
  • the cleaning target device is the heat transfer tube of the evaporator 1.
  • FIG. 10 for simplification of the drawing, only the inlet header 1a and the outlet header 1b of the heat transfer pipe to which the cleaning/storage device 2 is connected are shown.
  • the arrow entering the inlet header 1a represents the connection from the evaporator drum, and the arrow exiting the outlet header 1b represents the connection to the evaporator drum.
  • the cleaning storage device 2 includes a circulation unit 3, a chemical liquid tank 4, a chemical liquid pump 5, a makeup water tank 6, a drainage tank 7, and pipes L 1 to L 4 connecting them.
  • the circulation unit 3 includes a circulation flow path (pipe L 1 ) and a pump 8.
  • One end of the circulation flow path (pipe L 1 ) is connected to the inlet side of the heat transfer tube (inlet header 1 a) and the other end is connected to the outlet side of the heat transfer tube (outlet header 1 b ).
  • a pump 8 is provided in the middle of the circulation flow path (pipe L 1 ), and is configured to circulate a cleaning liquid or the like in the heat transfer tube.
  • Valves V 1 to V 4 are installed in the circulation flow path (pipe L 1 ).
  • the chemical liquid tank 4 is connected in the middle of the circulation flow path (pipe L 1 ) via the pipe L 2 and the chemical liquid pump 5.
  • a valve V 5 and a valve V 6 are arranged in the pipe L 2 so as to sandwich the chemical liquid pump 5.
  • a chemical liquid to be circulated (acid, rust remover or ammonia-based compound aqueous solution) can be stored.
  • the chemical liquid tank 4 may be a tank truck including the chemical liquid tank 4. In FIG. 10, since there is one chemical liquid tank 4, the chemical liquids in the chemical liquid tank 4 are replaced in order.
  • a makeup water tank 6 is connected to the circulation flow path (pipe L 1 ) via a pipe L 3 .
  • a valve V 7 and a valve V 8 are arranged in the pipe L 3 .
  • the connection position of the makeup water tank 6 may be either upstream or downstream of the circulating position of the connection position of the chemical liquid tank 4. Water such as pure water is stored in the makeup water tank 6.
  • the drainage tank 7 includes a connecting pipe (not shown) connected to both ends of the circulation flow path (pipe L 1 ) and the inlet port 1a of the heat transfer tube or the inlet port of the heat transfer tube via the lines L 4 to L 6. It is connected to the.
  • a valve V 9 and a valve V 10 are arranged in the pipe L 4 .
  • a valve V 11 and a valve V 12 are arranged in the pipe L 5 .
  • a valve V 13 and a valve V 14 are arranged in the pipe L 6 .
  • the filtration device 9 is provided in the circulation flow path (pipe L 1 ) on the circulation downflow outlet flow side of the pump 8.
  • the filtration device 9 is a device that removes fine solids by a filter or membrane filtration. Since the sludge generated in the neutral cleaning step and the acid cleaning step can be recovered by providing the filtering device 9 and the residual sludge amount during cleaning can be reduced, the risk of corrosion trouble due to residual sludge can be reduced.
  • FIG. 11 is a schematic diagram of a temporary system (cleaning storage device 20) different from FIG.
  • the same components as those in FIG. 10 are denoted by the same reference numerals.
  • a plurality of chemical liquid tanks 24a to 24c are connected in parallel, and a blow channel L 21 for returning drainage (blowing liquid) to one of the chemical liquid tanks 24a to 24c instead of the drainage tank 7.
  • a valve V 27 is arranged in the blow passage L 21 .
  • the makeup water tank 6, the chemical liquid tank 24a, the valve V 25a , the valve V26a , the chemical liquid pump 5, the pipe L 2 and the valve V 6 are the acidic cleaning liquid supply unit
  • the valve V 26b , the chemical liquid pump 5, the pipe L 2 and the valve V 6 are the neutral cleaning liquid supply unit
  • Acid is stored in the chemical liquid tank 24a.
  • a neutral rust remover is stored in the chemical liquid tank 24b.
  • Aqueous ammonia compound solution is stored in the chemical tank 24c.
  • the blow liquid in each step of acid cleaning liquid blowing, water washing, extrusion blow, and ammonia compound aqueous solution blowing can be returned to any of the chemical liquid tanks 24a to 24c.
  • the cleaning storage devices 2 and 20 of FIGS. 10 and 11 are either a detachable type that can be attached to a cleaning target device when used and can be detached from the cleaning target device when not in use, or a permanent type. Good.
  • FIG. 10 can be applied to the cleaning and storing method of the boiler plant of the first to third embodiments.
  • FIG. 11 can be applied to the cleaning and storing method of the boiler plant of the first to third embodiments.
  • FIG. 11 is particularly suitable for the cleaning and storing method of the boiler plant of the second and third embodiments.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Cleaning Or Drying Semiconductors (AREA)

Abstract

La présente invention a pour but de pourvoir à un procédé et à un appareil de nettoyage et d'entretien d'une installation de chaudière, permettant, pendant une période entre un nettoyage chimique et le début d'un fonctionnement normal, de soumettre des parties d'une chaudière à nettoyer à un traitement antirouille à faible coût et en peu de temps, et d'entretenir la chaudière. Le procédé d'entretien d'une installation de chaudière comprend : une étape (S2) permettant de soumettre des pièces à nettoyer, comportant des incrustations fixées, à un nettoyage neutre à température ambiante à l'aide d'un liquide de nettoyage neutre contenant un agent antirouille ; une étape (S4) permettant de faire circuler une solution aqueuse d'un composé à base d'ammoniac, présentant un pH égal ou supérieur à 9,8 à température ambiante, sur les parties à nettoyer ; et une étape (S5) permettant d'enlever par soufflage la solution aqueuse du composé à base d'ammoniac à partir des parties à nettoyer.
PCT/JP2019/048147 2018-12-27 2019-12-09 Procédé et appareil de nettoyage et d'entretien d'installation de chaudière WO2020137496A1 (fr)

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TW202041812A (zh) 2020-11-16

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