EP2596314A1 - Method of blocking a channel of a plate heat exchanger - Google Patents
Method of blocking a channel of a plate heat exchangerInfo
- Publication number
- EP2596314A1 EP2596314A1 EP11809953.0A EP11809953A EP2596314A1 EP 2596314 A1 EP2596314 A1 EP 2596314A1 EP 11809953 A EP11809953 A EP 11809953A EP 2596314 A1 EP2596314 A1 EP 2596314A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- channel
- port
- substance
- heat exchanger
- filling pipe
- 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- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/10—Means for stopping flow in pipes or hoses
- F16L55/1003—Means for stopping flow in pipes or hoses by introduction of paste, powder, particles, or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/10—Means for stopping flow in pipes or hoses
- F16L55/12—Means for stopping flow in pipes or hoses by introducing into the pipe a member expandable in situ
- F16L55/128—Means for stopping flow in pipes or hoses by introducing into the pipe a member expandable in situ introduced axially into the pipe or hose
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
- F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
- F28D9/005—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another the plates having openings therein for both heat-exchange media
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F11/00—Arrangements for sealing leaky tubes and conduits
Definitions
- US6620274 describes a method for repairing leaks of an aluminium heat exchanger by using e.g. an epoxy-type curable resin, which is provided directly around a damaged portion of the heat exchanger.
- an epoxy-type curable resin which is provided directly around a damaged portion of the heat exchanger.
- a filling pipe may be inserted into the upper port and located above said channel.
- the specific channel may be filled.
- the channel is filled until the substance being visible in level with the edge of the upper port.
- a sufficient filling of the channel is detected when any leakage is located below the upper port. If the leakage is known to be located at a lower level, less of the channel may be filled.
- the opposite (adjacent) channel may be filled to obtain a higher security against leakage. By this any leakage may be prevented to enter the opposite channel.
- the balloon is provided with an anti-adhesive oil, wax or similar, which facilitate removal of the balloon.
- a second fluid may flow from another port (not shown), via every other second channel including a first channel 51 and a second channel 52 that are adjacent (or “opposite") the channel to block 5, and to another port (not shown).
- Such flow of fluid is well known within the art and may be
- the adjacent channel 52 may be filled in a similar manner for obtaining a higher security against leakage through the hole 59.
- steps 204 and 206 may be omitted if other ways to introduce the substance in the channel respectively verification of the filling are implemented.
- several channels may be blocked in one operation by simultaneously pumping the substance into the channels.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
A method of blocking a channel (5) between at least one pair of adjacent plates (2) of a plate heat exchanger (1). The method comprises placing a balloon (6) or similar in a first port (4) of the channel (5) and inflating the balloon (6) in order to seal the port (4) from the channel (5), preparing a thermoset substance (75) and pumping the substance (75) into the channel (5) from a second port (3), wherein the channel (5) is at least partly filled, curing of the substance (75) and removing the balloon (6). A related plat heat exchanger and filling pipe are also described.
Description
METHOD OF BLOCKING A CHANNEL OF A PLATE HEAT EXCHANGER
Cross-reference to related applications
The invention is related to Swedish patent application no. 1050824-0, filed July 22, 2010, which is incorporated herein by reference.
Technical field
The invention relates to a method of blocking one or several channels between at least one pair of adjacent plates of a permanently joined plate heat exchanger, to a plate heat exchanger and to a filling pipe for carrying out the method.
Background
US6620274 describes a method for repairing leaks of an aluminium heat exchanger by using e.g. an epoxy-type curable resin, which is provided directly around a damaged portion of the heat exchanger. However, it is not possible to use such a method in connection with plate heat exchangers in which different heat transfer mediums flow on alternating sides of each plate of a stack of heat exchange plates.
GB812198 discloses the use of an inflatable rubber tube to be placed in one header of a heat exchanger to seal off an area to be able to detect leaks for a subsequent repair of the heat exchanger. However, the
specification does not suggest any method for repairing the heat exchanger.
US3966871 discloses the use of inflatable balloons to obtain an image of a suspected leakage area in a heat exchanger tube. However, the specification does not suggest any method for repairing the heat exchanger.
One problem with a plate heat exchanger is that it is more or less impossible to reach an area of a damage in a heat exchange plate or a hole through the plate to locally repair such damage or hole.
A further problem is that a permanently joined plate heat exchanger, as brazed, welded, glued or similarly, must be dismantled and returned to the manufacturer for reparation, which is very time-consuming.
Summary
One object of the present invention is to provide a method for blocking a channel of a plate heat exchanger, which channel has been damaged and where a leakage has been detected. By blocking (partly or fully) said channel the rest of the plate heat exchanger can be used for continuous operation.
According to a first aspect of the invention, this object is achieved by the steps of placing a balloon or similar in a lower (first) port of said channel and inflating the balloon in order to seal the port from the channel that is supposed to be blocked, preparing a thermo setting substance such as a thermo setting plastic, e.g. epoxy resin, and pumping the substance into the channel from an upper (second) port, wherein the channel is at least partly filled, curing of the thermoset substance and removing the balloon.
The type of thermo setting substance (thermoset) or resin that is chosen is depending on what type of media the thermoset is expected to be exposed to.
This solution facilitates a fast blocking of the leaky channel and an operator may continue to use the plate heat exchanger within a very short time compared with returning the plate heat exchanger for reparation.
A filling pipe may be inserted into the upper port and located above said channel. Hereby the specific channel may be filled. The channel is filled until the substance being visible in level with the edge of the upper port. Hereby a sufficient filling of the channel is detected when any leakage is located below the upper port. If the leakage is known to be located at a lower level, less of the channel may be filled.
According to another aspect of the invention the steps of a second filling are performed, where the filling pipe is firstly located in the upper port in its position for filling above the port and secondly the balloon is placed in the upper port for sealing the port together with the filling pipe. Hereby a filling of the channel is possible when any leakage is located above the upper port.
Additionally, also the opposite (adjacent) channel may be filled to obtain a higher security against leakage. By this any leakage may be prevented to enter the opposite channel.
Preferably, the balloon is provided with an anti-adhesive oil, wax or similar, which facilitate removal of the balloon.
According to a further aspect, the invention provides a plate heat exchanger for carrying out the method having one or several channels between at least one pair of adjacent plates of a permanently joined plate heat exchanger being blocked to avoid any leakage in said channel. A thermo setting substance may then fill said channel. Hereby the channel is excluded from fluid transfer and the rest of the plate heat exchanger can be used without any leakage.
The method thus uses that a section of the heat exchanger will be filled with a thermo setting substance such as a low viscosity thermo setting resin that have good wetting and penetration performance, e.g. epoxy. The method includes the steps of providing the filling pipe and/or the balloon with an anti- adhesive tape, oil or wax or similar. The balloon being placed in the lower port of a channel having a leakage and being inflated in order to seal the channel that is supposed to be blocked. A thermoset resin (substance) is prepared together with a tracing powder to indicate a sufficient mixing and is then pumped into the channel from an upper port. The channel is filled until the resin is visible being in level with the upper edge of the port. If the leakage is known to be at a lower level less resin may be used. The thermoset resin is cured, i.e. is allowed to cure, in accordance with its specification before the balloon is removed. An air flow may be provided in the opposite (adjacent) channel(s) in order to evacuate any heat that is produced during curing. If any leakage is located above the upper port a second filling is required, where the filling pipe is firstly located in its position for filling and secondly the balloon is placed in the port for sealing the port area together with the filling pipe. The filling is then repeated until the whole area above the port being filled. If desired also the opposite channel may be filled with the same substance to obtain a higher security against leakage.
Drawings
The present invention will now be described in more detail, with reference to the appended drawings that show an example of an embodiment of the invention, where
Figure 1 shows a schematic cross-sectional view of a plate heat exchanger through the port area of one heat transfer media, and
Figure 2 shows a flow chart of a method of blocking a channel between a pair of adjacent heat transfer plates of a plate heat exchanger. Detailed description
Figure 1 shows a plate heat exchanger 1 for heat treatment of fluid, comprising a stack of heat transfer plates 2, which in a suitable known manner are permanently joined to each other. The plates 2 may be joined by brazing, welding, gluing or similar. By being permanently joined, the plates are not intended to be separated, however, it is of course possible to cut the plates apart. The plate heat exchanger 1 having an upper port 3 and a lower port 4 for providing a flow of a heat transfer medium trough the channels 5 between two adjacent plates 2. The lower port 4 may be referred to as a first port and the upper port 3 may be referred to as a second port.
The method of treating the plate heat exchanger 1 includes the steps of first seal-off a channel 5 of the plate heat exchanger 1 including the area where leaking occurred. One way to seal-off is placing a balloon 6 or similar in the lower port 4 of said channel 5 and inflating the balloon 6 in order to seal the port 4 from the channel 5 that is supposed to be blocked, preparing a thermo setting substance 75 such as a thermoset resin and pumping the resin through a filling pipe 7 into the channel 5 from an upper port 3, wherein the channel 5 is filled until the resin being in level with the edge 8 of the upper port 3, curing of the thermoset resin and removing the balloon 6.
The method is thus uses that the channel 5 of the plate heat exchanger 1 will be filled with a low viscosity thermoset resin that have good wetting and penetration performance. The balloon 6 may be an ordinary pipe testing balloon provided with an anti-adhesive oil or wax or similar. The balloon 6 being placed in the lower port 4 of a channel 5 having a leakage and being
inflated in order to seal the channel 5 that is supposed to be blocked. A thermoset resin is prepared together with a tracing powder to indicate a sufficient mixing and is then pumped into the channel 5 from the upper port 3. The channel 5 is preferably filled until the resin is visible being in level with the edge 8 of the port 3, however also a partial filling may be used. The thermoset resin is cured in accordance to its specification before the balloon 6 is removed. Preferably, an air flow is provided in the opposite channel (not shown) in order to evacuate any heat that is produced during curing. If any leakage is located above the upper port 3 a second filling is required, where the filling pipe 7 is firstly located in its position for filling above the upper port 3 and secondly the balloon 6 is placed in the port 3 for sealing the port 3 together with the filling pipe 7. The filling is then repeated until the whole area above the port 3 being filled. If desired also the opposite channel may be filled to obtain a higher security against leakage.
The filling of a single channel may be carried out in several steps since the thermoset resin need to cure in steps in order to not become too warm. The time period between each filling step may be e.g. 1 -5 hours.
The filling pipe 7 can be provided with means such as guiding flanges 71 , 72 or similar to ensure that the filling pipe 7 is located in the correct position for filling the correct channel 5 in the above the upper port 3. When the filling pipe 7 is provided with the two guiding flanges 71 , 72 a space D1 between the guiding flanges 71 , 72 is slightly smaller than a channel opening D2 between the heat transfer plates 2, i.e. D1 is slightly smaller then the channel opening D2 of the channel 5 to be filled with the substance.
In detail, the stack of heat transfer plates 2 of the plate heat exchanger
1 comprises two separate sets of channels which are accomplished by alternatively joining the heat transfer plates at respective outer
circumferences of the plates and at ports of the plates, thereby creating alternate sets of fluid channels. Fluid of a first set of channels is then led through the stack of heat transfer plates 2 via one porthole to another, such as via the upper port 3 and the lower port 4. Fluid of a second set of channels is led through the stack 2 via two other portholes (not shown). The flow of the fluids may be a counter-current, a co-current or a cross flow type.
Thus, in the illustrated embodiment, a first fluid may flow e.g. from the upper port hole 3, further in between every second channel including the channel to block 5, and to the lower port hole 4. The ports 3, 4 thus form ports of the channel to block 5 and every second channels like channel 53. A second fluid may flow from another port (not shown), via every other second channel including a first channel 51 and a second channel 52 that are adjacent (or "opposite") the channel to block 5, and to another port (not shown). Such flow of fluid is well known within the art and may be
accomplished according to known techniques for obtaining a proper transfer of heat between the fluids.
The channel 5 to be filled with the thermo setting substance is defined by a spacing between a first heat transfer plate 21 and a second heat transfer plate 22 that is adjacent the first heat transfer plate 21 . The first and second heat transfer plates 21 , 22 form a pair of heat transfer plates and are comprised in the stack of heat transfer plates 2. Obviously, the channel to be blocked 5 implies that any of the first heat transfer plate 21 and the second heat transfer plate 22 are damaged, for example in form of a hole 59 in the second heat transfer plate 22. The hole 59 may per se be located by employing conventional techniques.
With reference to Figure 2 the method of blocking the channel 5 is illustrated. In a first step 201 the balloon 6 is placed in the first port 4 of the channel 5. In a next step 202 the balloon 6 is inflated in order to seal the first port 4 from the channel to block 5. In a next step 203 a thermo setting substance 75 such as a thermo setting plastic resin is prepared. In a next step 204 the filling pipe 7 is inserted into the second port 3. The inserting typically includes positioning the flanges 71 , 72 of the filling pipe 7 as indicated in Figure 1 . In a next step 205 the substance is pumped into the channel 5 from the second port 3, such that the channel 5 is at least partly filled with the substance 75. In the step 205 of pumping the substance, a step 206 of filling the channel 5 until the substance is visible in level with an edge 8 of the second port 3 may be performed. In a next 207 step the substance is allowed to cure. In a final step 208 the balloon 6 is removed from the first port
4 and the filling pipe 7 is removed from the second port 3. Repair of the heat exchanger 2 is then accomplished.
Additionally, in a further step 209 the adjacent channel 52 may be filled in a similar manner for obtaining a higher security against leakage through the hole 59. It should also be noted that steps 204 and 206 may be omitted if other ways to introduce the substance in the channel respectively verification of the filling are implemented. Also, several channels may be blocked in one operation by simultaneously pumping the substance into the channels. The person skilled in the art realizes that the present invention by no means is limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims. For example, the method may also be used on rubber sealed plate heat exchangers if desired.
Claims
A method of blocking one channel (5) or several channels between at least one pair (21 , 22) of adjacent heat transfer plates (2) of a plate heat exchanger (1 ), c h a r a c t e r i s e d b y
- placing (201 ) a balloon (6) or similar in a first port (4) of the channel
(5),
- inflating (202) the balloon (6) in order to seal the first port (4) from the channel (5),
- preparing (203) a thermo setting substance (75) such as a thermo setting plastic resin,
- pumping (205) the substance (75) into the channel (5) from a second port (3) of the channel (5), wherein the channel (5) is at least partly filled by the substance (75),
- allowing (207) the substance (75) to cure, and
- removing (208) the balloon (6).
A method according to claim 1 , comprising inserting (204) a filling pipe
(7) into the second port (3).
A method according to claim 2, wherein the filling pipe (7) is provided with an arrangement (71 , 72) for locating the channel (5) to be filled.
A method according to any one of claims 1 -3, comprising filling (206) the channel (5) until the substance (75) is visible in level with an edge
(8) of the second port (3).
A method according to any one of claims 1 -4, comprising a second filling, where
- the filling pipe (7) is located in the second port (3) in its position for filling above the port (3), and
- the balloon (6) is placed in the second port (3) for sealing the port (3) in cooperation with the filling pipe (7).
A method according to any one of claims 1 -5, comprising filling (209) channel (52) that is adjacent the channel (5) to be blocked, for obtaining a higher security against leakage.
A method according to any one of claims 1 -6, wherein the balloon (6) provided with an anti-adhesive tape, oil, wax or similar.
A plate heat exchanger (1 ) for which the method according to any of claims 1 -7 is carried out, wherein one channel (5) or several channels between at least one pair of adjacent heat transfer plates (21 , 22) of the plate heat exchanger (1 ) is blocked for reducing leakage in the channel (5).
9. A plate heat exchanger according to claim 8, wherein the channel (5) is at least partly filled by a thermo setting substance (75) such as a thermo setting plastic resin, such that the channel (5) is blocked.
10. A filling pipe (7) for carrying out the method according to any one of claims 1 -7, wherein the filling pipe (7) is provided with an arrangement (71 , 72) for guiding the filling pipe (7) to a channel (5) to be filled by a thermo setting substance (75).
1 1 . A filling pipe (7) according to claim 10, wherein the arrangement (71 , 72) to guide the filling pipe (7) to the channel (5) to be filled comprises two flanges (71 , 72) that are arranged on the filling pipe (7) at distance (D1 ) from each other, where the distance (D1 ) is equal or smaller than a spacing (D2) between the pair (21 , 22) of adjacent heat transfer plates.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1050824A SE534993C2 (en) | 2010-07-22 | 2010-07-22 | Heat exchanger, filling tube and method for blocking a duct in a plate heat exchanger |
| PCT/SE2011/050962 WO2012011866A1 (en) | 2010-07-22 | 2011-07-21 | Method of blocking a channel of a plate heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2596314A1 true EP2596314A1 (en) | 2013-05-29 |
| EP2596314A4 EP2596314A4 (en) | 2014-01-01 |
Family
ID=45497078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11809953.0A Withdrawn EP2596314A4 (en) | 2010-07-22 | 2011-07-21 | Method of blocking a channel of a plate heat exchanger |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2596314A4 (en) |
| SE (1) | SE534993C2 (en) |
| WO (1) | WO2012011866A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI124230B (en) * | 2012-05-28 | 2014-05-15 | Vahterus Oy | PROCEDURES AND ARRANGEMENTS FOR REPAIRING A HEAT EXCHANGE PLATE PACKAGE AND PLATE HEAT EXCHANGER |
| CN107990776A (en) * | 2017-11-20 | 2018-05-04 | 天津市环亚船用热交换器有限公司 | A kind of detection device of novel ship heat exchanger |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB812198A (en) * | 1956-09-18 | 1959-04-22 | Gen Electric Co Ltd | Improvements in or relating to methods of and apparatus for detecting leaks in apparatus such as heat exchangers |
| US3774678A (en) * | 1971-04-07 | 1973-11-27 | F Glorisi | Cooling system with selectively replaceable radiator sections |
| DE2358802A1 (en) * | 1973-11-26 | 1975-05-28 | Kraftwerk Union Ag | PROCEDURE FOR IDENTIFYING WALL DAMAGE INSIDE THE HEAT EXCHANGER TUBES |
| JPH07248091A (en) * | 1994-03-11 | 1995-09-26 | Susumu Yasuda | Pipe internal passage blocking tool |
| JP4081805B2 (en) * | 1999-09-17 | 2008-04-30 | 株式会社デンソー | Heat exchanger repair method |
| BRPI0922363A2 (en) * | 2008-12-03 | 2017-06-06 | Ziebel As | method for stopping the leakage of fluid from wells from a rewindable well intervention rod. |
-
2010
- 2010-07-22 SE SE1050824A patent/SE534993C2/en not_active IP Right Cessation
-
2011
- 2011-07-21 WO PCT/SE2011/050962 patent/WO2012011866A1/en not_active Ceased
- 2011-07-21 EP EP11809953.0A patent/EP2596314A4/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| SE1050824A1 (en) | 2012-01-23 |
| EP2596314A4 (en) | 2014-01-01 |
| WO2012011866A1 (en) | 2012-01-26 |
| SE534993C2 (en) | 2012-03-06 |
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