US3872920A - Descaling system for the cooling tubes of a steam condenser - Google Patents

Descaling system for the cooling tubes of a steam condenser Download PDF

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Publication number
US3872920A
US3872920A US445581A US44558174A US3872920A US 3872920 A US3872920 A US 3872920A US 445581 A US445581 A US 445581A US 44558174 A US44558174 A US 44558174A US 3872920 A US3872920 A US 3872920A
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US
United States
Prior art keywords
cooling water
sponge
water
soaking vessel
vessel
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US445581A
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English (en)
Inventor
Yoshio Honma
Junichi Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co Ltd
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Filing date
Publication date
Application filed by Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
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Publication of US3872920A publication Critical patent/US3872920A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • F28G1/00—Non-rotary, e.g. reciprocated, appliances
    • F28G1/12—Fluid-propelled scrapers, bullets, or like solid bodies

Definitions

  • ABSTRACT A sponge ball type descaling system for cleaning the interiorof the cooling water tubes of a steam condenser by conducting a large number of sponge balls therethrough, which comprises a sponge ball circulation passageway connected to the cooling water inlet and outlet pipes of the steam condenser; a sponge ball reservoir and a sponge ball circulation pump provided in the sponge ball circulation passageway; a vessel for wetting sponge balls with cooling water, thereby supplying fully water-soaked sponge balls to the descaling system, the water-soaking vessel and inlet and outlet valves thereof being arranged in a prescribed relationship with the sponge ball circulation passageway; and an evacuating device connected to the sponge ballsoaking vessel so as to evacuate the interior thereof to a prescribed extent and increase the water content
  • This invention relates to a descaling system for the heat-exchanging tubes of a heat exchanger, especially for the cooling tubes of a steam condenser and more particularly to the so-called sponge-ball type descaling system for removing substances deposited on the inner walls of the cooling water tubes of a steam condenser by continuously forcing a large number of watersoaked sponge balls through the cooling water tubes.
  • a sponge ball type descaling system for the cooling water tubes of a steam condenser which comprises a sponge ball circulation passageway connected to the cooling water inlet and outlet pipes of the steam con denser; a sponge ball reservoir and a sponge ball circulation pump provided in the sponge ball circulation passageway; a vessel for soaking sponge balls with cooling water, thereby supplying fully Water-soaked sponge balls to the descaling system, the water-soaking vessel and the inlet and outlet valves thereof being arranged in a prescribed relationship with the sponge ball circu-' lation passageway; and an evacuating device connected to the sponge ball-soaking vessel so as to evacuate the interior thereof to a prescribed vacuum level.
  • a sponge ball reservior 20 is provided in the sponge ball circulation passageway 8 between the outlet valve 17 of the watersoaking vessel 11 and the valve 9. While one cycle of descaling operation is continued, the sponge ball reservior 20 is put out of operation, allowing sponge balls to pass therethrough. Upon completion of one cycle of descaling operation, all used sponge balls 12 are collected in the reservior 20 and thereafter taken out of the descaling system.
  • a deaeration pipe 21 led in the evacuating device 15 has one end connected to the float valve 14 and the other end divided into two branch pipes, one of which is open to the atmosphere through a deaeration valve 22 and the other of which connects to a cooling water separator 24 through another deaeration valve 23.
  • the cooling water separator 24 is connected to one end of a second deaeration pipe 25 which is provided with a deaeration valve 26 and filter 27, and further downstream to a vacuum pump 28.
  • the vacuum pump 28 may be replaced by an ordinary air extracting means, for example, an air ejector.
  • the inlet valve 16 When the water-soaking vessel 11 has been evacuated to a prescribed vacuum level, the inlet valve 16 is opened. Accordingly, cooling water is led from the discharge pipe 6 through the collector 7 to the sponge ball circulation passageway 8 and then to the water-soaking vessel 11 to soak the sponge balls 12 received therein with water.
  • the inlet valve 16 When the water-soaking vessel 11 is fully filled with cooling water, the inlet valve 16 is closed, the vacuum pump 28 is actuated, the deaeration valves 23, 26 remain open and the air contained'in the coolingwater is extracted (Deaeration valve 22 remains closed) by the pump 28 through the separator 24 and the filter 27.
  • This evacuating operation causes air to be transferred together with cooling water to the first deaeration pipe 21 and also the cooling water itself to be substantially separated from air by the separator 24.
  • the cooling water which has not been fully separated further flows in the form of mist together with air to the second deaeration pipe 25.
  • the misty cooling water is completely eliminated by the filter 27, and
  • the vacuum pump 28 itself is provided with a device for preventing the ingress of cooling water, the separator 24 and filter 27 will be unnecessary.
  • Sponge balls 12 brought into the cooling water feed pipe 5 are transferred together with cooling water into the inlet water box 2 andthen into the cooling water tubes 4 of the steam condenser 1.
  • the sponge balls 12 already fully soaked with water are prevented from floating upward in the inlet water box 2 and consequently uniformly distributed through the cooling water tubes 4.
  • the sponge balls 12 While passing through the cooling water tubes 4, the sponge balls 12 are carried onwards while rubbing off injurious deposits on the inner walls of the cooling water tubes 4, collected in the outlet water box 3, and then drained into the discharge pipe 6.
  • the sponge balls 12 After transferred through the discharge pipe 6, the sponge balls 12 are returned through the collector 7 to the circulation passageway 8. Most of the cooling water is drained off, for example, into the sea immediately from the discharge pipe 6.
  • cooling water tubes 4 of the steam condenser 1 can be fully attained by repeating the circulation of numerous sponge balls 12 for 30 minutes or an hour at the rate of once every 30 seconds.
  • the operation of descaling the inner walls of the cooling water tubes 4 of a steam condenser l by the descaling system according to the first embodiment of this invention can be automatically carried out by regulating the operation time and timing of the associated valves and pumps through automatic sequence control.
  • sequence control are the inlet and outlet valves 16, 17, deaeration valves 22, 23, 26, sponge ball circulation pump 19 and vacuum pump 28.
  • the collector 7 with a supervisory means for detecting the extent to which circulating sponge balls 12 are soiled and, when soiling reaches a prescribed extent, automatically stop the sponge ball circulation pump 19.
  • FIG. 2 illustrate a descaling system according to the second embodiment of this invention for the cooling water tubes lof a steam condenser 1.
  • the components of FIG. 2 the same as those of FIGv 1 are denoted by the same numerals. There will now be described only the different arrangement of FIG. 2 from that of FIG. 1.
  • the sponge ball circulation passageway fi further has the sponge ball reservoir 20 provided with an inlet valve 31 and the circulation pump 19 provided with an inlet valve 32.
  • the upstream end of the inlet pipe 29 of the sponge ball water-soaking vessel 11 is connected to the passageway 8 between the inlet valve 31 of the sponge ball reservoir 20 and the check valve 18 on the upstream side of the inlet valve 31.
  • the downstream end of the outlet pipe 30 of the sponge ball water-soaking vessel 11 is connected between the valve 10 and the inlet valve 32 of the circulation pump 19 on the upstream side ofthe inlet valve 32.
  • Mounted on part of the upper surface of the sponge ball water-soaking vessel 11 is the wire net 13, on which the float valve 14 is provided.
  • the water-soaking vessel 11 is connected to the evacuating device 15 through the float valve 14. This arrangement, as well as that of the evacuating device 15 itself, is the same as in the first embodiment.
  • the sponge ball water-soaking vessel 11 filled with sponge balls is evacuated to a prescribed vacuum level, with the inlet and outlet valves 16, 17 closed, by actuating the vacuum pump 28 as in the first embodiment. Thereafter, the valves 10, 32 closed up to this point are opened, and the inlet valve 16 of the sponge ball watersoaking vessel 11 is opened with the inlet valve 31 of the sponge ball reservoir closed. Accordingly, cooling water is brought into the water-soaking vessel 11 through the sponge ball circulation passageway 8 and the inlet pipe 29 of the vessel 11 to fill the watersoaking vessel 11 with cooling water.
  • the inlet and the outlet valves 16, 17 are closed. Thereafter, as in the first embodiment, the inner walls of the cooling water tubes 4 of the steam condenser 1 are cyclically descaled by the sponge balls 12, During this descaling operation, the inlet and outlet valves 16, 17 remain closed to prevent the sponge balls 12 from being brought back into the water-soaking vessel 11 to keep it empty of the balls. Therefore, the sec ond embodiment enables fresh sponge balls to be supplied to the descaling system while the cleaning operation is still'going on.
  • the second embodiment has the advantage that the water-soaking vessel can be designed to have a small capacity.
  • the evacuating de vice 15 is actuated after fresh sponge balls 12 are put in the water-soaking vessel 11 and thereafter the inlet valve 16 thereof is opened, then part of the cooling water is led into the inlet pipe 29 of the water-soating vessel 11 from the sponge ball circulation passageway 8 and then into the water-soaking vessel 11 from the inlet pipe 29, thereby soaking sponge balls 12 with cooling water in the same manner as described above.
  • the inlet and outlet valves 16, 17 are opened after the sponge balls are fully filled with water by the water-soaking vessel 11,.then the fresh sponge balls 12 are all forced into the circulation passageway 8, thereby contributing to the descaling'operation in cooperation with the previously charged sponge balls 12.
  • the descaling operation of the second embodiment is regulated by automatic sequence control as in the first embodiment.
  • the descaling system of this invention enables the sponge balls to be automatically deaerated and soaked with water at the same time and also the regulation of their circulation to be attained by the automatic sequence control by valves and pumps, thereby attaining a quicker descaling operation, and
  • the descaling system of the invention is of sufficiently simple construction and operation to admit of easy inspection and maintenance.
  • this invention is not limited to the first and second embodiments.
  • the water-soaking vessel, circulation pump and reservoir included in the sponge ball circulation system may be arranged in any other relationship than described in the foregoing embodiments. It is also possible to provide a single vessel capable of concurrently acting as a sponge ball watersoaking vessel and receptacle, instead of installing these components separately as described herein.
  • a descaling system wherein a wire net is mounted on part of the upper surface of the sponge ball water-soaking vessel to prevent sponge balls received therein from being thrown outside; a float valve is provided on the wire net; and the watersoaking vessel is connected to the evacuating device through the wire net and float valve.
  • a descaling system for cleaning the inner walls of the cooling water tubes ofa steam condenser by a plurality of sponge balls which comprises a cooling water feed pipe connected to the inlet side of the cooling water tubes to supply cooling water thereto; a cooling water discharge pipe connected to the outlet side of the cooling water tubes to drain off cooling water therefrom; a sponge ball collector fitted to the discharge pipe; a sponge ball circulation passageway connected at one end to the cooling water feed pipe and at the other end to the sponge ball collector, said circulation passageway containing a sponge ball circulation pump and reservoir; a sponge ball water-soaking vessel for receiving a plurality of sponge balls to soak them with cooling water; a soaking vessel inlet pipe for connecting the inlet side of the soaking vessel to the circulation passageway; a soaking vessel outlet pipe for connecting the outlet side of the soaking vessel to the circulation passageway; an inlet valve fitted to the soaking vessel inlet pipe; an outlet valve provided on the soaking vessel outlet pipe; and evacuating device connected to the water-soaking vessel for holding sponge balls to deaerate

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cleaning In General (AREA)
  • Cleaning By Liquid Or Steam (AREA)
US445581A 1973-05-28 1974-02-25 Descaling system for the cooling tubes of a steam condenser Expired - Lifetime US3872920A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5858573A JPS534567B2 (zh) 1973-05-28 1973-05-28

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US3872920A true US3872920A (en) 1975-03-25

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JP (1) JPS534567B2 (zh)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919732A (en) * 1973-11-08 1975-11-18 Tokyo Shibaura Electric Co Descaling system for condenser cooling tubes
US3978917A (en) * 1973-10-22 1976-09-07 Tokyo Shibaura Electric Co., Ltd. Descaling system for the cooling water tubes of a steam condenser
US4079782A (en) * 1974-11-14 1978-03-21 The Leslie Company Self cleaning heat exchanger circuit
US4135574A (en) * 1976-03-26 1979-01-23 Ludwig Taprogge, Reinigungsanlagen Fur Rohren-Warmeaustauscher Device for recovering cleaning elements from a heat-exchanger stream
US4281636A (en) * 1979-06-07 1981-08-04 Vegh Elmer S Steam processor
US4314604A (en) * 1978-09-23 1982-02-09 Josef Koller Apparatus for the segregation of worn-out cleaning bodies
FR2495028A1 (fr) * 1980-12-01 1982-06-04 Alsthom Atlantique Element de nettoyage et installation de nettoyage mettant en oeuvre cet element
US4554965A (en) * 1983-03-17 1985-11-26 Taprogge Gesellschaft Mbh Ball-measuring system for self-cleaning heat exchanger
US4556102A (en) * 1983-03-17 1985-12-03 Taprogge Gesellschaft Mbh Batch-type scrubbing-ball replacement system for heat exchanger
US4566533A (en) * 1982-03-02 1986-01-28 Taprogge Gesellschaft Mbh Apparatus for cleaning heat exchanger pipes and methods of operating an apparatus of this type
US4696318A (en) * 1985-11-12 1987-09-29 Slickbar Products Corp. Washing methods and apparatus for heat exchanger tube cleaning plugs
GB2181810B (en) * 1983-11-23 1990-06-13 Superior I D Tube Cleaners Inc Tube cleaners.
US4984629A (en) * 1989-09-13 1991-01-15 Water Services Of America, Inc. Ball collector and filling apparatus for circulating ball cleaning system
US4995313A (en) * 1988-03-15 1991-02-26 Welbilt Corporation Cooking apparatus
EP0631103A2 (fr) * 1993-06-22 1994-12-28 Technos Et Compagnie Perfectionnements aux installations de nettoyage de tubes par circulation de boules spongieuses, notamment au plan de l'imprégnation en eau des boules
US5433229A (en) * 1994-04-06 1995-07-18 Slickbar Products Corp. System for recovering and washing tube cleaning plugs
US5447193A (en) * 1993-11-18 1995-09-05 C.Q.M. Ltd. Apparatus for injecting a volume of liquid into a liquid-conducting system
KR101498719B1 (ko) * 2013-09-16 2015-03-06 주식회사 이엠이 열교환기 튜브 세정용 스펀지 볼 탈기함수 장치
US20160084594A1 (en) * 2014-03-05 2016-03-24 Pingsuo JIANG Rubber ball cleaning multipoint centralized ball serving system for condenser
CN112113370A (zh) * 2020-08-26 2020-12-22 张帅 一种具有热交换结构的新能源汽车用水冷式冷凝器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10371470B2 (en) * 2015-11-12 2019-08-06 DOOSAN Heavy Industries Construction Co., LTD Condenser tube cleaning apparatus

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1795348A (en) * 1927-03-30 1931-03-10 Westinghouse Electric & Mfg Co Condenser-cleaning system
US2670723A (en) * 1951-03-01 1954-03-02 Vapor Heating Corp Shot blast cleaner for coil type steam generators
US2801824A (en) * 1953-02-02 1957-08-06 Taprogge Josef Self-cleaning heat exchanger
US3021117A (en) * 1957-07-23 1962-02-13 Taprogge Josef Self-cleaning heat-exchanger
US3151461A (en) * 1962-05-07 1964-10-06 Worthington Corp Means for removing non-condensible gases from boiler feedwater in a power plant
US3707442A (en) * 1970-02-27 1972-12-26 Hitachi Ltd Multistaged flash evaporator and a method of operating the same with sponge ball descaling treatment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1795348A (en) * 1927-03-30 1931-03-10 Westinghouse Electric & Mfg Co Condenser-cleaning system
US2670723A (en) * 1951-03-01 1954-03-02 Vapor Heating Corp Shot blast cleaner for coil type steam generators
US2801824A (en) * 1953-02-02 1957-08-06 Taprogge Josef Self-cleaning heat exchanger
US3021117A (en) * 1957-07-23 1962-02-13 Taprogge Josef Self-cleaning heat-exchanger
US3151461A (en) * 1962-05-07 1964-10-06 Worthington Corp Means for removing non-condensible gases from boiler feedwater in a power plant
US3707442A (en) * 1970-02-27 1972-12-26 Hitachi Ltd Multistaged flash evaporator and a method of operating the same with sponge ball descaling treatment

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978917A (en) * 1973-10-22 1976-09-07 Tokyo Shibaura Electric Co., Ltd. Descaling system for the cooling water tubes of a steam condenser
US3919732A (en) * 1973-11-08 1975-11-18 Tokyo Shibaura Electric Co Descaling system for condenser cooling tubes
US4079782A (en) * 1974-11-14 1978-03-21 The Leslie Company Self cleaning heat exchanger circuit
US4135574A (en) * 1976-03-26 1979-01-23 Ludwig Taprogge, Reinigungsanlagen Fur Rohren-Warmeaustauscher Device for recovering cleaning elements from a heat-exchanger stream
US4314604A (en) * 1978-09-23 1982-02-09 Josef Koller Apparatus for the segregation of worn-out cleaning bodies
US4281636A (en) * 1979-06-07 1981-08-04 Vegh Elmer S Steam processor
FR2495028A1 (fr) * 1980-12-01 1982-06-04 Alsthom Atlantique Element de nettoyage et installation de nettoyage mettant en oeuvre cet element
US4566533A (en) * 1982-03-02 1986-01-28 Taprogge Gesellschaft Mbh Apparatus for cleaning heat exchanger pipes and methods of operating an apparatus of this type
US4554965A (en) * 1983-03-17 1985-11-26 Taprogge Gesellschaft Mbh Ball-measuring system for self-cleaning heat exchanger
US4556102A (en) * 1983-03-17 1985-12-03 Taprogge Gesellschaft Mbh Batch-type scrubbing-ball replacement system for heat exchanger
GB2181810B (en) * 1983-11-23 1990-06-13 Superior I D Tube Cleaners Inc Tube cleaners.
US4696318A (en) * 1985-11-12 1987-09-29 Slickbar Products Corp. Washing methods and apparatus for heat exchanger tube cleaning plugs
US4995313A (en) * 1988-03-15 1991-02-26 Welbilt Corporation Cooking apparatus
US4984629A (en) * 1989-09-13 1991-01-15 Water Services Of America, Inc. Ball collector and filling apparatus for circulating ball cleaning system
EP0631103A2 (fr) * 1993-06-22 1994-12-28 Technos Et Compagnie Perfectionnements aux installations de nettoyage de tubes par circulation de boules spongieuses, notamment au plan de l'imprégnation en eau des boules
FR2706788A1 (zh) * 1993-06-22 1994-12-30 Bizard Andre
EP0631103A3 (fr) * 1993-06-22 1995-08-09 Technos & Co Perfectionnements aux installations de nettoyage de tubes par circulation de boules spongieuses, notamment au plan de l'imprégnation en eau des boules.
US5482111A (en) * 1993-06-22 1996-01-09 Technos Et Compagnie Installations for cleaning tubes by circulating spongy balls, in particular improvements relating to impregnating the balls with water
US5447193A (en) * 1993-11-18 1995-09-05 C.Q.M. Ltd. Apparatus for injecting a volume of liquid into a liquid-conducting system
US5433229A (en) * 1994-04-06 1995-07-18 Slickbar Products Corp. System for recovering and washing tube cleaning plugs
KR101498719B1 (ko) * 2013-09-16 2015-03-06 주식회사 이엠이 열교환기 튜브 세정용 스펀지 볼 탈기함수 장치
US20160084594A1 (en) * 2014-03-05 2016-03-24 Pingsuo JIANG Rubber ball cleaning multipoint centralized ball serving system for condenser
US9791222B2 (en) * 2014-03-05 2017-10-17 Shaanxi Hand Energy Conservation And Environmental Protection Technology Co., Ltd Rubber ball cleaning multipoint centralized ball serving system for condenser
CN112113370A (zh) * 2020-08-26 2020-12-22 张帅 一种具有热交换结构的新能源汽车用水冷式冷凝器
CN112113370B (zh) * 2020-08-26 2022-03-15 张帅 一种具有热交换结构的新能源汽车用水冷式冷凝器

Also Published As

Publication number Publication date
JPS506902A (zh) 1975-01-24
DE2408973A1 (de) 1974-12-19
JPS534567B2 (zh) 1978-02-18
DE2408973B2 (de) 1976-04-01

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