CN111579163A - Method for online overhauling inner leakage of plate heat exchanger - Google Patents
Method for online overhauling inner leakage of plate heat exchanger Download PDFInfo
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- CN111579163A CN111579163A CN202010305931.8A CN202010305931A CN111579163A CN 111579163 A CN111579163 A CN 111579163A CN 202010305931 A CN202010305931 A CN 202010305931A CN 111579163 A CN111579163 A CN 111579163A
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- heat exchanger
- plate heat
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- pressing plate
- movable pressing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automatic Assembly (AREA)
- Examining Or Testing Airtightness (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model provides a method of leaking in on-line maintenance plate heat exchanger, through processing the foot hole and installing blind flange on the activity pressure strip, make personnel can observe the inside of plate heat exchanger through the foot hole of activity pressure strip, then dismantle or remove activity pressure strip and part slab, make the inside slab and the cushion of leaking the position of plate heat exchanger expose, examine the change to the cushion, just can be in the production site and under the condition of not dismantling fixed pressure strip and business turn over pipeline, directly judge the interior hourglass position of plate heat exchanger and overhaul, the operation that makes the interior hourglass overhaul is very simplified, greatly reduced the time that current interior hourglass maintenance process consumed, manpower and material resources, especially be favorable to the condition that needs to overhaul plate heat exchanger in succession, can greatly improve efficiency through production actual verification.
Description
Technical Field
The invention relates to the field of leakage maintenance of plate heat exchangers, in particular to a method for online maintenance of inner leakage of a plate heat exchanger.
Background
The plate heat exchanger consists of plates, a sealing gasket, a fixed compression plate, a movable compression plate, a clamping bolt, an upper guide rod, a lower guide rod, a pillar and the like, has the advantages of high heat transfer coefficient, large logarithmic mean temperature difference, small occupied area, easy change of heat exchange area or flow combination, light weight, low price, convenient manufacture, easy cleaning, small heat loss, difficult scaling and the like, and is widely applied to the fields of refrigeration, heating and ventilation air conditioning, chemical industry, mechanical industry, electric power industry, petroleum, medicine, seawater desalination, ships and the like. The common type of the plate heat exchanger at present is that four corner holes are all distributed on a fixed pressure strip, and no hole is formed on a movable pressure strip. Plate heat exchanger equipment back needs carry out hydrostatic test, and according to the national standard requirement, the cold side hot side all carries out unilateral hydrostatic test, and when the cold side was tested promptly, hot side inside emptying fluid falls to press the condition through cold side pressure gauge and judges that the heat exchanger leaks, leaks outward and judges through observing plate heat exchanger ground all around, and interior hourglass is judged through whether the slab that observes hot side corner hole the inside drips.
However, the existing plate heat exchanger is difficult to perform online maintenance on the internal leakage in the operation process because the fixed compression plate of the plate heat exchanger cannot move, the foot hole of the fixed compression plate is connected with an inlet and outlet pipeline for medium flowing, and the positions of the fixed compression plate and the inlet and outlet pipeline are strictly planned in the production field and are strictly matched with the equipment and medium flow direction in the whole heat exchange system, when the internal leakage needs to be observed through the foot hole of the fixed compression plate, the conditions of the production field are limited, and the inlet and outlet pipeline or the fixed compression plate is extremely difficult to remove, so that the plate heat exchanger generally needs to be dismounted from the production field and lifted integrally and then transferred to other fields for maintenance of the internal leakage in the prior art, which can cause long-time shutdown of the production field, and the plate heat exchanger needs to be tested to operate firstly after maintenance, just can finally judge whether interior hourglass has been eliminated, when leaking in the effect that overhauls after the trial run was not good or just originally had a plurality of places in the plate heat exchanger, must need the process that many rounds of repeated maintenance just can thoroughly eliminate interior hourglass, and every round of maintenance all needs to carry out the process of once dismantling, installation and transporting to plate heat exchanger among the prior art, and is extremely wasted time and energy, especially can produce very adverse effect when overhauing in succession.
Disclosure of Invention
In order to solve the problem that the internal leakage of the conventional plate heat exchanger is difficult to overhaul on line in the operation process, the invention provides a method for overhauling the internal leakage of the plate heat exchanger on line.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for online repairing inner leakage of a plate heat exchanger comprises the following steps:
transformation of plate heat exchanger
Processing a pin hole on the movable pressing plate, wherein the pin hole on the movable pressing plate corresponds to the pin hole of the medium outlet at the hot side on the fixed pressing plate, and processing a plurality of threaded blind holes on the plate surface of one side of the movable pressing plate, which is far away from the fixed pressing plate; covering a blind flange on the foot hole of the movable pressing plate, and respectively screwing a plurality of bolts penetrating through the blind flange into respective threaded blind holes to connect the blind flange with the movable pressing plate and seal one end of the foot hole away from the fixed pressing plate;
second, the inner leakage is overhauled on line
When the plate heat exchanger runs, closing a hot side valve, stopping the flow of a hot side medium, keeping the flow of a cold side medium under pressure, then removing a blind flange, discharging the hot side medium remained in the plate heat exchanger through foot holes of a movable pressing plate, observing the inner side of the plate heat exchanger through the foot holes to determine the position of the cold side medium leaked in the plate heat exchanger, then closing the cold side valve, stopping the flow of the cold side medium, then disassembling or moving the movable pressing plate and part of the plate, exposing the plate and the rubber gasket at the position of the leakage in the plate heat exchanger, after the rubber gasket is inspected and replaced, reassembling the plate and the movable pressing plate, opening the cold side valve, enabling the cold side medium to continue flowing under pressure, observing the leakage condition of the cold side medium in the plate heat exchanger again through the foot holes, continuously overhauling the plate heat exchanger according to the leakage condition until the inner leakage of the, and (4) reinstalling the blind flange to the movable compression plate, opening the hot-side valve, enabling the medium at the hot side to start flowing under pressure, and overhauling to finish the continuous operation of the plate heat exchanger.
Preferably, the plurality of threaded blind holes are uniformly distributed at intervals along the circumferential direction of the foot hole.
Preferably, before the blind flange is covered on the foot hole of the movable pressing plate, an anti-corrosion lining ring is installed at one end of the foot hole far away from the fixed pressing plate, and a rubber sheet is adhered to the surface of one side, facing the foot hole, of the blind flange.
Preferably, the anti-corrosion liner ring is a rubber liner ring.
According to the technical scheme, the invention has the beneficial effects that:
according to the method for overhauling the inner leakage of the plate heat exchanger on line, provided by the invention, the pin holes are processed on the movable pressing plate and the blind flanges are installed, so that personnel can observe the inside of the plate heat exchanger through the pin holes of the movable pressing plate, and can directly judge and overhaul the inner leakage position of the plate heat exchanger under the condition that the fixed pressing plate and the inlet and outlet pipelines are not disassembled on the production site, and the condition that the inlet and outlet pipelines or the fixed pressing plate are very difficult to disassemble due to the condition of the production site because the inner leakage is observed through the pin holes of the fixed pressing plate in the prior art is avoided, so that the plate heat exchanger is required to be integrally disassembled from the production site and transferred to other sites for inner leakage overhauling after being lifted, and the operation of inner leakage overhauling is greatly simplified.
And, after once overhauls and accomplishes the back with the activity pressure strip reassemble can try on the move, just can observe through the foot hole of activity pressure strip at once when interior hourglass still exists, whether can directly judge out interior hourglass thoroughly to eliminate promptly, then continue to repair at the scene immediately, every round of maintenance all need once dismantle the plate heat exchanger when having carried out many rounds of repeated overhauls among the prior art, the complicated process of installation and transportation, the online maintenance of the interior hourglass of plate heat exchanger has been realized, the time that current interior hourglass maintenance process consumed has greatly been reduced, manpower and material resources, especially, be favorable to needing the condition that the formula heat exchanger carries out the maintenance in succession, can greatly improve efficiency through production actual verification, receive operation workman's good.
According to the invention, the position of the foot hole on the movable compression plate corresponds to the position of the foot hole of the hot side medium outlet on the fixed compression plate, so that when the inner leakage is overhauled, the flowing of the hot side medium is stopped and the flowing of the cold side is kept, on one hand, the hot side medium can be saved, the hot side medium containing heat energy is prevented from being wasted by useless consumption in the overhauling process, on the other hand, when the medium leaked from the inside of the plate heat exchanger is observed through the foot hole, the condition that the hot side medium leaks to cause scalding danger in the observing process can be avoided, and the safe operation of the overhauling process is ensured.
Drawings
Fig. 1 is a schematic view of a movable compression plate of the present invention.
Detailed Description
The invention provides a method for overhauling the inner leakage of a plate heat exchanger on line, which comprises the following steps:
transformation of plate heat exchanger
As shown in fig. 1, a pin hole is processed on the movable pressure strip, the position of the pin hole on the movable pressure strip corresponds to the position of the pin hole of the medium outlet on the hot side of the fixed pressure strip, and is usually located on the lower half part of the heat exchange side of the plate type shown in fig. 1, and a plurality of threaded blind holes are processed on the plate surface of one side of the movable pressure strip, which is far away from the fixed pressure strip, and are uniformly distributed at intervals along the circumferential direction of the pin hole.
A blind flange is covered on the foot hole of the movable pressing plate, and a plurality of bolts penetrating through the blind flange are screwed into respective threaded blind holes respectively, so that the blind flange is connected with the movable pressing plate and seals one end of the foot hole far away from the fixed pressing plate. Before blind flanges are covered on foot holes of the movable pressing plate, an anti-corrosion lining ring is installed at one end, far away from the fixed pressing plate, of the foot hole, rubber is pasted on the surface, facing the foot holes, of the blind flange, and the material of the rubber is usually the same as that of a rubber cushion in the plate heat exchanger.
The embodiment is a plate heat exchanger with the specification of P150, the adopted blind flange is a national standard DN150 PN16 blind flange, a D150 rubber lining ring is additionally arranged on a pin hole before the blind flange is installed, and a hydrostatic test is carried out after the DN150 blind flange is installed.
Second, the inner leakage is overhauled on line
When the plate heat exchanger runs, a hot side valve is closed, the flowing of a hot side medium is stopped, the flowing of a cold side medium under pressure is kept, then a blind flange is removed, the hot side medium remained in the plate heat exchanger is discharged through foot holes of a movable pressing plate, and then the hot side medium is observed towards the inner side of the plate heat exchanger through the foot holes to determine the position of the cold side medium leaking in the plate heat exchanger.
And then closing the cold side valve, stopping the flow of the cold side medium, then disassembling or moving the movable pressing plate and part of the plate to expose the plate and the rubber pad at the leakage position in the plate heat exchanger, after the rubber pad is checked and replaced, reassembling the plate and the movable pressing plate, opening the cold side valve to enable the cold side medium to continuously flow under pressure, and observing the leakage condition of the cold side medium in the plate heat exchanger again through the foot holes.
And (4) continuing to overhaul according to the leakage condition, namely if the inner leakage still exists, detaching or moving the movable pressing plate and part of plates again, continuously checking and replacing the rubber mat at the leakage position, then performing trial operation again, reinstalling the blind flange to the movable pressing plate until the inner leakage of the plate heat exchanger is eliminated, opening a hot side valve to enable a hot side medium to start flowing under pressure, completing overhaul and continuing to operate the plate heat exchanger.
Claims (4)
1. A method for on-line overhauling inner leakage of a plate heat exchanger is characterized by comprising the following steps:
transformation of plate heat exchanger
Processing a pin hole on the movable pressing plate, wherein the pin hole on the movable pressing plate corresponds to the pin hole of the medium outlet at the hot side on the fixed pressing plate, and processing a plurality of threaded blind holes on the plate surface of one side of the movable pressing plate, which is far away from the fixed pressing plate; covering a blind flange on the foot hole of the movable pressing plate, and respectively screwing a plurality of bolts penetrating through the blind flange into respective threaded blind holes to connect the blind flange with the movable pressing plate and seal one end of the foot hole away from the fixed pressing plate;
second, the inner leakage is overhauled on line
When the plate heat exchanger runs, closing a hot side valve, stopping the flow of a hot side medium, keeping the flow of a cold side medium under pressure, then removing a blind flange, discharging the hot side medium remained in the plate heat exchanger through foot holes of a movable pressing plate, observing the inner side of the plate heat exchanger through the foot holes to determine the position of the cold side medium leaked in the plate heat exchanger, then closing the cold side valve, stopping the flow of the cold side medium, then disassembling or moving the movable pressing plate and part of the plate, exposing the plate and the rubber gasket at the position of the leakage in the plate heat exchanger, after the rubber gasket is inspected and replaced, reassembling the plate and the movable pressing plate, opening the cold side valve, enabling the cold side medium to continue flowing under pressure, observing the leakage condition of the cold side medium in the plate heat exchanger again through the foot holes, continuously overhauling the plate heat exchanger according to the leakage condition until the inner leakage of the, and (4) reinstalling the blind flange to the movable compression plate, opening the hot-side valve, enabling the medium at the hot side to start flowing under pressure, and overhauling to finish the continuous operation of the plate heat exchanger.
2. The method for on-line servicing an internal leak in a plate heat exchanger of claim 1, wherein: the plurality of threaded blind holes are uniformly distributed at intervals along the circumferential direction of the pin hole.
3. The method for on-line servicing an internal leak in a plate heat exchanger of claim 1, wherein: before blind flanges are covered on the pin holes of the movable pressing plate, an anti-corrosion lining ring is arranged at one end of each pin hole, which is far away from the fixed pressing plate, and rubber sheets are adhered to the surfaces of the blind flanges, which face to the side of the pin holes.
4. A method of on-line servicing a leak in a plate heat exchanger according to claim 3, characterized in that: the anti-corrosion bushing ring is a rubber bushing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010305931.8A CN111579163A (en) | 2020-04-17 | 2020-04-17 | Method for online overhauling inner leakage of plate heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010305931.8A CN111579163A (en) | 2020-04-17 | 2020-04-17 | Method for online overhauling inner leakage of plate heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111579163A true CN111579163A (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010305931.8A Pending CN111579163A (en) | 2020-04-17 | 2020-04-17 | Method for online overhauling inner leakage of plate heat exchanger |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1499165A (en) * | 2002-11-07 | 2004-05-26 | 缪志先 | Plate heat exchanger possessing exterior passageway and welded structure in new type sealing way |
| JP2010121989A (en) * | 2008-11-18 | 2010-06-03 | Iwai Kikai Kogyo Co Ltd | Method for performing maintenance on heat exchange plate of plate-type heat exchanger |
| KR20140126203A (en) * | 2013-04-22 | 2014-10-30 | 고려엠지주식회사 | A heat exchanger prventing water leak |
| CN204923985U (en) * | 2015-07-09 | 2015-12-30 | 李龙辉 | Novel convenient leak detection plate heat exchanger |
| CN109297327A (en) * | 2018-10-09 | 2019-02-01 | 青岛科技大学 | A kind of experiment visualization plate heat exchanger |
| CN210180244U (en) * | 2019-07-12 | 2020-03-24 | 睿能太宇（沈阳）能源技术有限公司 | Plate heat exchanger with observation sight glass |
-
2020
- 2020-04-17 CN CN202010305931.8A patent/CN111579163A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1499165A (en) * | 2002-11-07 | 2004-05-26 | 缪志先 | Plate heat exchanger possessing exterior passageway and welded structure in new type sealing way |
| JP2010121989A (en) * | 2008-11-18 | 2010-06-03 | Iwai Kikai Kogyo Co Ltd | Method for performing maintenance on heat exchange plate of plate-type heat exchanger |
| KR20140126203A (en) * | 2013-04-22 | 2014-10-30 | 고려엠지주식회사 | A heat exchanger prventing water leak |
| CN204923985U (en) * | 2015-07-09 | 2015-12-30 | 李龙辉 | Novel convenient leak detection plate heat exchanger |
| CN109297327A (en) * | 2018-10-09 | 2019-02-01 | 青岛科技大学 | A kind of experiment visualization plate heat exchanger |
| CN210180244U (en) * | 2019-07-12 | 2020-03-24 | 睿能太宇（沈阳）能源技术有限公司 | Plate heat exchanger with observation sight glass |
Non-Patent Citations (3)
| Title |
|---|
| 刘思阳 徐同奎: "可拆式全焊接板式换热器维护检修规程初探", 《压力容器》 * |
| 普瑞普勒（北京）能源技术有限公司: "板式换热器内部串液（俗称内漏）的维修", 《土木易商宝》 * |
| 董天梅主编: "《制药设备实训教程》", 30 June 2008, 中国医药科技出版社 * |
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Application publication date: 20200825 |
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