EP0544348A2 - Equipement de nettoyage pour un échangeur de chaleur - Google Patents

Equipement de nettoyage pour un échangeur de chaleur Download PDF

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Publication number
EP0544348A2
EP0544348A2 EP92203376A EP92203376A EP0544348A2 EP 0544348 A2 EP0544348 A2 EP 0544348A2 EP 92203376 A EP92203376 A EP 92203376A EP 92203376 A EP92203376 A EP 92203376A EP 0544348 A2 EP0544348 A2 EP 0544348A2
Authority
EP
European Patent Office
Prior art keywords
baffles
pipes
pipe
equipment
jacket
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.)
Withdrawn
Application number
EP92203376A
Other languages
German (de)
English (en)
Other versions
EP0544348A3 (en
Inventor
Einar Boe
Rolf Gronnerud
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.)
Yara Technology BV
Norsk Hydro Technology AS
Original Assignee
Norsk Hydro Technology BV
Norsk Hydro Technology AS
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
Publication date
Application filed by Norsk Hydro Technology BV, Norsk Hydro Technology AS filed Critical Norsk Hydro Technology BV
Publication of EP0544348A2 publication Critical patent/EP0544348A2/fr
Publication of EP0544348A3 publication Critical patent/EP0544348A3/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F28G1/02—Non-rotary, e.g. reciprocated, appliances having brushes

Definitions

  • the present invention is related to cleaning equipment for a heat exchanger of the so-called jacket-pipe section type with built-in baffles and containing a jacket fitted with an inlet and an outlet for a medium which circulates through the jacket and a number of pipes fitted in the jacket parallel with the jacket's longitudinal axis and supported by built-in baffles.
  • soot or other particles When a liquid or gas is led through heat exchangers, soot or other particles will always be deposited. For example, when gas is used in the jacket and water in the pipes, soot will be deposited on the outside of the pipes and after a period of time efficiency will be reduced. It is consequently necessary to clean the outside of the pipes at regular intervals.
  • Pipe heat exchangers are usually cleaned by flushing both the jacket and the pipes in countercurrent direction with a fluid, possibly with an added anti-encrustation solvent.
  • Another method is to dismantle the whole heat exchanger and clean the baffles and the pipes mechanically.
  • both these methods require that the heat exchanger be disconnected from the process, which is relatively expensive and laborious.
  • the objective of the present invention is thus to produce cleaning equipment which makes it possible to clean the heat exchanger efficiently and speedily during operation.
  • baffles were stiffened to prevent them from being displaced. Furthermore, the baffles were secured in the main pipe thus allowing for all the baffles to be moved over the outside of the pipes by pulling/pushing the main pipe out/in.
  • the necessary displacement length for the main pipe was equivalent to the distance between two adjoining baffles. The whole length of the pipes could consequently be scraped.
  • the inventors discovered that it was possible to mount circular brushes at the pipe holes of the baffles. In addition to an increase in cleaning efficiency, the brushes also reduced the necessity of making pipe holes with extremely low tolerances.
  • Pulling/pushing the baffles forwards and backwards over the pipes can be achieved in a number of ways, for example by using motor power or a hydraulic or pneumatic cylinder which is directly connected to the main pipe.
  • the cylinder may be placed outside the end bottom of the heat exchanger, or it can be mounted internally as part of the main pipe.
  • the hydraulics can be operated by external oil/gas pressure or, by using a pump, the pressure for either the inflowing liquid or gas can be used to operate the cylinder.
  • the choice of solution for operation of the main pipe depends, among other things, on where the heat exchanger is to be used.
  • the sweeping operation can be controlled in a number of ways.
  • the baffles can be moved over the pipes automatically at fixed intervals or depending on the outflow temperature of the medium, as an increase in the medium's outflow temperature would indicate poor heat transfer due to pipe encrustation. After each scraping/sweeping, the scraped off encrustation flows out with the gas or falls to the bottom of the heat exchanger from where it can be removed with a mechanical device such as a scraper, a screw, etc.
  • the invention covers all types of baffle heat exchanger with or without a main pipe.
  • a baffle heat exchanger without a main pipe has to be modified by the baffles being stiffened and attached to a joint bar which links all the baffles together. Furthermore, it will be necessary to mount one or more push/pull bars on the end baffle which is/are, for example, operated by a hydraulic device, as previously described.
  • FIG. 1 shows a schematic cross-section through the heat exchanger with the main pipe, baffles and an attached hydraulic cylinder.
  • Fig. 1 shows a schematic section of a heat exchanger 7 consisting of a jacket 1 with an inlet 2 for the inflow of the heating medium, which is gas in the example shown.
  • the inlet 2 and an upper inlet part (a vapour belt) 3 and the jacket 1 have been insulated with a fire-proof substance. This is done because the inflowing medium may have a temperature of up to approx. 1000 ° C.
  • an outlet pipe 5 for the cooling medium in this case water, is connected to an end lid 6.
  • the end lid 6 is secured to the jacket 1 by flanges 8.
  • At the other end there are an inlet pipe 9 for the cooling medium and an outlet pipe 10 for the heating medium.
  • a main pipe 11 has been concentrically fitted to the pipe section as shown in fig. 2.
  • the baffles 12 carry the pipes 13 as they are fitted with a number of openings 19 through which the pipes run.
  • the baffles have been adjusted exactly in accordance with the reference line both in relation to each other and the pipes.
  • the pipes are not fixed to the baffles but are mounted freely. In turn, the pipes have been welded or fixed in another way to the pipe plates 18.
  • the baffles are mutually secured by the bars 14 stretching through all the baffles. This can be seen more clearly in fig. 3 which shows a section of a baffle 12 with bars 14, pipes 13 and pipe casings 16.
  • the pipe casings 16 are placed in the baffle holes.
  • the pipe casings have an internal diameter which has been adjusted to the external pipe diameter, and an external diameter which has been adjusted to the baffle diameter.
  • the casing is secured in the baffle holes by two end stops which prevent the casing from being pulled out of the baffle when the pipes are pulled/pushed forwards and backwards. The movement of the casings will also contribute to cleaning the baffles.
  • the main pipe 11 is attached to a hydraulically-controlled arm 20 allowing the main pipe to be pulled/pushed forwards and backwards.
  • the hydraulic device can be controlled automatically, for example on the basis of the outflow temperature of the heating medium measured with a sensor. If the flow quantity and the inflow temperature are constant, an increase in the outflow temperature registered by a sensor will indicate a reduction of the heat transfer between the media due to pipe encrustation.
  • the hydraulic device can thus be activated.
  • Other solutions are to control the hydraulic device manually or automatically at regular intervals. With these solutions it will be necessary neither to dismantle the heat exchanger nor to stop the process for cleaning. Cleaning can be carried out during operation.
EP19920203376 1991-11-25 1992-11-06 Cleaning equipment for a heat exchanger Withdrawn EP0544348A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO914596 1991-11-25
NO914596A NO173712B (no) 1991-11-25 1991-11-25 Renseutstyr for varmeveksler

Publications (2)

Publication Number Publication Date
EP0544348A2 true EP0544348A2 (fr) 1993-06-02
EP0544348A3 EP0544348A3 (en) 1993-10-27

Family

ID=19894623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920203376 Withdrawn EP0544348A3 (en) 1991-11-25 1992-11-06 Cleaning equipment for a heat exchanger

Country Status (5)

Country Link
EP (1) EP0544348A3 (fr)
JP (1) JPH0642893A (fr)
CA (1) CA2082766A1 (fr)
FI (1) FI925235A (fr)
NO (1) NO173712B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405973B (de) * 1998-06-26 2000-01-25 Hackl Hubert Reinigungsvorrichtung für wärmetauscherzüge
NL2011057C2 (en) * 2013-06-28 2015-01-05 Geurts Internat B V Heat exchanger and process to cool a gas.

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6761698B2 (en) 2000-07-28 2004-07-13 Olympus Corporation Ultrasonic operation system
JP2017156025A (ja) * 2016-03-02 2017-09-07 東京電力ホールディングス株式会社 熱交換システム
CN116642355B (zh) * 2023-07-12 2024-01-16 天津海钢板材有限公司 一种基于酸再生的烟气余热回收利用设备
CN117258342B (zh) * 2023-11-21 2024-02-06 湖南汇虹试剂有限公司 一种精馏塔温度调控装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB375132A (en) * 1931-08-28 1932-06-23 Thomas Thompson Brown Improvements in tubular heat exchangers for use in oil fuel installations and applicable also for use as feed water heaters, evaporators, condensers and coolers
GB714926A (en) * 1951-05-10 1954-09-08 Swinney Brothers Ltd Improvements in or relating to heat exchangers
FR1093366A (fr) * 1954-02-18 1955-05-03 Dispositif pour le nettoyage automatique des tubes de distillateurs, de concentrateurs, de cristallisoirs et d'échangeurs
FR1308703A (fr) * 1961-09-27 1962-11-09 Dispositif de nettoyage mécanique de la surface extérieure de tubes
US3086235A (en) * 1961-07-17 1963-04-23 Anthony J Taormina Wire brush chain

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5342267B2 (fr) * 1974-02-08 1978-11-10
JPS5369965A (en) * 1976-12-03 1978-06-21 Nippon Kentetsu Co Ltd Dust remover
JPS57169600A (en) * 1981-04-10 1982-10-19 Hitachi Ltd Detector for fouling of heat exchanger
JPH01274000A (ja) * 1988-04-27 1989-11-01 Hitachi Ltd 熱交換器の水室

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB375132A (en) * 1931-08-28 1932-06-23 Thomas Thompson Brown Improvements in tubular heat exchangers for use in oil fuel installations and applicable also for use as feed water heaters, evaporators, condensers and coolers
GB714926A (en) * 1951-05-10 1954-09-08 Swinney Brothers Ltd Improvements in or relating to heat exchangers
FR1093366A (fr) * 1954-02-18 1955-05-03 Dispositif pour le nettoyage automatique des tubes de distillateurs, de concentrateurs, de cristallisoirs et d'échangeurs
US3086235A (en) * 1961-07-17 1963-04-23 Anthony J Taormina Wire brush chain
FR1308703A (fr) * 1961-09-27 1962-11-09 Dispositif de nettoyage mécanique de la surface extérieure de tubes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405973B (de) * 1998-06-26 2000-01-25 Hackl Hubert Reinigungsvorrichtung für wärmetauscherzüge
NL2011057C2 (en) * 2013-06-28 2015-01-05 Geurts Internat B V Heat exchanger and process to cool a gas.

Also Published As

Publication number Publication date
JPH0642893A (ja) 1994-02-18
FI925235A0 (fi) 1992-11-18
EP0544348A3 (en) 1993-10-27
NO914596L (no) 1993-05-26
NO914596D0 (no) 1991-11-25
FI925235A (fi) 1993-05-26
CA2082766A1 (fr) 1993-05-26
NO173712B (no) 1993-10-11

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