Classifications

• • 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
  • 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
  • F28D9/0093—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
  • F25B15/008—Sorption machines, plants or systems, operating continuously, e.g. absorption type with multi-stage operation
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
  • F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
  • F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2270/00—Thermal insulation; Thermal decoupling
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2270/00—Thermal insulation; Thermal decoupling
  • F28F2270/02—Thermal insulation; Thermal decoupling by using blind conduits

Definitions

• the present invention relates to a three-fluid plate heat exchanger, and more particularly, to a three-fluid plate heat exchanger for sequentially exchanging heat of a first fluid with a second fluid and a third fluid, and a method of manufacturing the same.
• a three-fluid plate heat exchanger for sequentially exchanging heat of a first fluid with a second fluid and a third fluid, and a method of manufacturing the same.
• a portion of the plate laminate near one end in the plate material longitudinal direction is a plate member 15.
• the first heat exchange section 13 A alternately located in the material laminating direction is referred to as a first heat exchange section 13 A.
• first-stage heat exchange unit 13 A for exchanging the first fluid a with the second fluid L c, followed by the second-stage heat exchange unit 13 for exchanging the first fluid La with the third fluid L b B and the plate 15 were juxtaposed in the longitudinal direction to form an integrated structure.
• the main problem of the present invention is to achieve a more compact structure by adopting a rational structure in integrating the front heat exchange section and the rear heat exchange section, and to reduce heat loss. (Heat loss).
• a portion of the plate material laminate closer to one end side in the plate material lamination direction is provided with a first fluid path between plates for allowing a first fluid to pass between the materials.
• a pre-stage heat exchange section in which plate-to-plate second fluid passages for passing a second fluid between the plate members are alternately positioned in the plate member stacking direction; and the other end of the plate member stack in the plate member stacking direction In the near portion, a first inter-plate fluid path for passing the first fluid between the plate members and a third inter-plate fluid path for passing the third fluid between the plate members are laminated.
• the latter heat exchange section which are alternately located in
• the first-stage heat exchange unit that exchanges heat with the first fluid and the second-stage heat exchange unit that subsequently exchanges heat with the third fluid in the plate material laminating direction Since it adopts a form of side-by-side integration, the front heat exchange section and the rear heat exchange section are lined up in the direction Compared with the structure to be laminated, the length of the laminated plate material is reduced by half (the area is also reduced by half), and it is possible to form a three-dimensionally more integrated shape in the laminated plate material.
• the entire heat exchanger can be made more compact and more easy to install and handle, and halving the length of the plate (half the area) reduces heat shrinkage and thermal distortion. The response can be made easier, and the production of the heat exchanger itself can be made easier.
• the outer surface area of the plate laminate can be reduced by the above three-dimensional consolidation, the heat loss from the outer surface can be suppressed, thereby further improving the heat exchange in terms of energy saving.
• the heat exchange between the front heat exchange section and the rear heat exchange section having different temperature levels is prevented by the heat insulating layer, and the heat exchange between the two heat exchange sections is prevented.
• Heat loss in short, heat loss due to heat exchange between the second fluid and the third fluid, which is not the object of the original heat exchange, can be suppressed. It is possible to make the heat exchanger more excellent in heat exchange property and more advantageous in energy saving.
• the heat insulating layer is formed at the boundary between the first heat exchange section and the second heat exchange section in a state where the original laminated structure in which a large number of plate materials are stacked is used, the formation of the heat insulating layer itself is facilitated.
• the heat exchanger can be easily and efficiently manufactured.
• each of the three or more adjacent plate members located at the boundary between the first-stage heat exchange unit and the second-stage heat exchange unit in the laminated plate members is fluidized. Insulation that does not pass through ⁇ .
• each of the above-mentioned adjacent plate materials is used as a heat insulation layer, the heat insulation effect is enhanced by increasing the heat insulation layer and increasing the thickness of the heat insulation layer as a whole, and increasing the heat insulation effect.
• the heat loss due to heat transfer between the heat exchanger and the subsequent heat exchanger can be more effectively suppressed.
• the heat insulating layer formed between the plate members is a vacuum heat insulating layer, so that the vacuum space has an extremely high heat insulating effect.
• the first fluid transfer path is provided between the plurality of plates in the pre-stage heat exchange section in a state where the plate material is penetrated in the plate material laminating direction inside the plate material laminate.
• the first fluid passage and the first fluid passage between the plurality of plates in the post-stage heat exchange section are configured to extend.
• the first heat exchange section connects the first fluid passage to the second heat exchange section.
• the structure around the plate laminate is simplified compared to the structure in which the first fluid transfer path for transferring the first fluid to the first fluid path between the plates is formed outside the plate laminate by external piping.
• the entire heat exchanger can be made more compact.
• the first fluid introduction path that allows the first fluid to flow in parallel into the first fluid path between the plates in the pre-stage heat exchange section The second fluid introduction passage through which the second fluid flows in parallel into the plurality of inter-plate second fluid passages in the section, and the second fluid that has passed through the plurality of inter-plate second fluid passages in the pre-stage heat exchange section A second fluid outlet path to be discharged, a third fluid introduction path through which the third fluid flows in parallel to the third fluid path between the plates in the rear heat exchange section, and a third fluid path between the plates in the rear heat exchange section A third fluid outlet for collecting and discharging the third fluid that has passed through the first fluid, and a first fluid outlet for collecting and discharging the first fluid that has passed through the multiple first fluid passages between the plates in the subsequent heat exchange section ) Is a state in which the plate material is penetrated in the plate material lamination direction inside the plate material laminate.
• the adjacent plate materials are solder-bonded under the vacuum.
• a method is adopted in which a vacuum-tight airtight space serving as the vacuum heat insulating layer is simultaneously formed between the plate members located at the boundary between the first-stage heat exchange unit and the second-stage heat exchange unit.
• FIG. 1 is a configuration diagram of an absorption refrigerator.
• FIG. 2 is a longitudinal sectional view of the heat exchanger.
• FIG. 3 is a partial cross-sectional view of the heat exchanger.
• FIG. 4 is a schematic perspective view of the heat exchanger.
• FIG. 5 is a longitudinal sectional view of a heat exchanger showing another embodiment.
• FIG. 6 is a schematic structural diagram of a heat exchanger showing a conventional example. BEST MODE FOR CARRYING OUT THE INVENTION
• Figure 1 shows the equipment configuration of an absorption refrigerator
• 1 is a high-temperature regenerator
• 2 is a low-temperature regenerator
• 3 is a condenser
• 4 is an evaporator
• 5 is an absorber
• the high-temperature regenerator 1 is a refrigerant.
• the medium-absorbent liquid Lb after the refrigerant R is separated by the high-temperature regenerator 1 is sent to the low-temperature regenerator 2 through the flow path r 1, and the refrigerant vapor R ′ generated in the high-temperature regenerator 1 is converted into the flow path r 2 to the low-temperature regenerator 7 in the low-temperature regenerator 2 as a heat source, whereby the low-temperature regenerator 2 uses the refrigerant vapor R 'generated in the high-temperature regenerator 1 to heat the medium-concentration absorbing liquid Lb. As a result, the refrigerant R is further evaporated and separated from the concentrated absorbent Lb.
• Refrigerant vapor R ' generated in low-temperature regenerator 2 and heat source in low-temperature heater 7
• the used refrigerant vapor R ′ is condensed by being cooled by the cooler 8 in the condenser 3, and the condensed refrigerant R (that is, liquid refrigerant) is sent to the evaporator 4 through the flow path r 3.
• the condensed refrigerant R sent from the condenser 3 is circulated by the refrigerant pump 9 A and sprayed to the interior heat exchanger 11 by the sprayer 10. It evaporates, and by taking the heat of vaporization at that time, the cooling fluid C (for example, water or brine) flowing through the interior heat exchanger 11 is cooled.
• the cooling fluid C for example, water or brine
• the high-concentration absorbent L c after separating the refrigerant R in the low-temperature regenerator 2 is sent to the absorber 5 through the channel r 4, and the high-concentration absorbent L sent from the low-temperature regenerator 2 in the absorber 5
• the refrigerant vapor R ′ generated in the evaporator 4 is absorbed by the spray absorbing liquid Lc, thereby evaporating the sprayed refrigerant R at a low temperature in the evaporator 4.
• the low-concentration absorbent La after absorbing the refrigerant vapor R 'in the absorber 5 is returned to the high-temperature regenerator 1 through the flow path r5 by the solution pump 9B, and the refrigerant is returned from the low-concentration absorbent La again. Return to the step of separating R.
• Reference numeral 13 denotes low-temperature, low-concentration absorbent La returned to high-temperature regenerator 1 and medium-temperature, high-concentration absorbent Lc sent from low-temperature regenerator 2 to absorber 5, and low-temperature regeneration from high-temperature regenerator 1.
• This is a heat recovery heat exchanger for sequentially exchanging heat with the high-temperature medium-concentration absorbing solution Lb sent to the vessel 2 to recover the retained heat of the high-concentration absorbing solution Lc and the medium-concentration absorbing solution Lb.
• the heat recovery heat exchanger 13 is shown only schematically to show the heat exchange order of the low concentration absorbent La for the high concentration absorbent Lc and the medium concentration absorbent Lb. However, this does not match the specific structure described later.
• Reference numeral 14 indicates that the absorption of the refrigerant into the spray absorption liquid L c in the absorber 5 is half of the time.
• a cooler that removes generated heat of absorption, and supplies a cooling fluid W (for example, cooling water circulated between the cooling tower) to a cooler 14 in the absorber 5 and a cooler 8 in the condenser 3. I do.
• Heat exchanger for heat recovery for exchanging heat between three fluids, low-concentration absorbent La, high-concentration absorbent Lc, and medium-concentration absorbent Lb (hereinafter referred to as first to third fluids in this order) 1 3
• plate material 15 having a corrugated cross-sectional shape excluding the vicinity of both ends and having holes p1 to p4 at the corners for forming lead-in / out paths is provided by:
• a large number of corrugated peaks are formed in a state where they are opposed to each other, and as shown in FIG. 4, the portion of the plate material laminated body near one end in the plate material laminating direction is formed as shown in FIG.
• the first heat exchange section 13A for exchanging heat with the first fluid La with the second fluid Lc is provided.
• the portion of the sheet laminate near the other end in the plate stacking direction is the first heat exchange section 1A.
• a first heat exchange section 13B is provided, in which the first fluid La that has undergone heat exchange with the second fluid Lc at 3A is subsequently subjected to heat exchange with the third fluid Lb.
• the first fluid path f1 between the plates through which the first fluid La passes between the adjacent plate materials 15 and the adjacent plate material 15 The inter-plate second fluid path f 2 through which the second fluid c passes between them is alternately positioned in the plate material laminating direction, and during the passage of these inter-plate fluid paths f 1 and f 2, the plate material Heat is exchanged between the first fluid La and the second fluid Lc using 15 as a heat transfer wall.
• the first fluid path f1 that allows the first fluid La to pass between the adjacent plate materials 15 is adjacent to the first fluid path f1.
• the third inter-plate fluid path f 3 that allows the third fluid Lb to pass between the plate members 15 is alternately positioned in the plate lamination direction, and the inter-plate fluid paths f 1 and f 3 pass through.
• the first fluid La and the third fluid Lb exchange heat with the plate 15 as a heat transfer wall.
• each of the inter-channel fluid paths f1 to f3 is subdivided into a large number in the plate width direction orthogonal to the fluid flow direction by a plate material laminated structure in which the peaks of the waveform face each other. As a result, a large heat transfer area is secured and high strength is obtained.
• each inter-plate fluid path f1 to f3 are formed into a flat plate shape with no corrugation near both ends of each plate material 15, thereby forming a part of the header for the flow path subdivided in the plate width direction.
• one of the holes P1 to p4 for forming the lead-in / out channel formed at the four corners of each plate material 15 is provided inside the plate material laminate at the former stage.
• the first fluid transfer path m and the respective outgoing / incoming paths i 1, ol, i 2, ⁇ 2, ⁇ 2, i 3, and ⁇ 3, which will be described later, are indicated by overlapping portions of these flow paths.
• the longitudinal section of the heat exchanger 13 is shown in a state where is expanded.
• a first fluid introduction passage i1 is formed inside the plate laminate and extends partially across the other end of the first fluid passage f1 between the plates in the first stage heat exchange section 13A, and the second stage heat exchange is performed.
• the first fluid passage between each plate in the subsequent heat exchange section 13B inside the plate material laminate the first fluid outlet path extending over a part of the header on the other end side of f1 0 1 and the first fluid path f 2 between the plates In the penetrating part of the fluid introduction path i 1 and the penetrating part of the first fluid outlet path 0 1 with respect to the third inter-plate fluid path f 3, the neck part d of the hole p 4 in the lamination of the material 15
• the neck part d of the hole p 4 in the lamination of the material 15 By extending to the corresponding hole p 4 of 15, communication between the first fluid introduction path i 1 and the second fluid path f 2 between the plates, and the first fluid outlet path 01 and the third fluid path between the plates are performed: Each of the communication with f 3 is cut off.
• the hole p2 which is located in the width direction of the plate with respect to the hole p1 that forms the first fluid transfer path m, of the pre-heat exchange section 13A, has a pre-stage heat exchange inside the plate material laminate.
• a second fluid introduction passage i2 is formed between the ends of the second fluid passage f2 between the plates in part 13A, which extends partially to one end of the second fluid passage f2.
• a third fluid outlet path o3 is formed across the one end header of the third inter-plate fluid path f3 in the subsequent heat exchange section 13B at the second stage, and the first inter-plate fluid path f1 is formed.
• the neck d of the hole p2 in the lamination of the plate material 15 is the adjacent plate material. 15 to the corresponding hole p2, the communication between the second fluid introduction passage i2 and the first fluid passage f1 between the plates, and the third fluid outlet passage o3 and the first fluid passage f between the plates f 1 It is shut off the respective communication of.
• the remaining one of the four holes p1 to ⁇ 4 for forming the lead-in / out path is formed by the pre-stage heat exchange unit 13A in the pre-stage heat exchange unit 13A.
• a second fluid outlet path 0 2 is formed across the other end of the second fluid path f 2 between the plates in A at the other end side, and in the subsequent heat exchange section 13 B, the inside of the sheet laminate is formed.
• a third fluid introduction path i3 is formed to partially extend to the other end of the third fluid path f3 between the plates in the subsequent heat exchange section 13B.
• the first fluid La is caused to flow in parallel from the first fluid introduction passage i1 to the plurality of inter-plate first fluid passages: 1 in the upstream heat exchange section 13A, Subsequently, the first fluid a, which has passed through the plurality of inter-plate first fluid passages f 1 in these pre-stage heat exchange units 13 A in parallel, is once gathered through the first fluid transfer passage m to form the first heat exchange unit 1A.
• the first fluid L that has flowed in parallel to the plurality of first fluid paths between plates in 3B: 1 and has passed in parallel through the plurality of first fluid paths f1 between the plates in these subsequent heat exchangers 13B a is discharged in a collective state from the first fluid outlet channel o1.
• the pre-stage heat exchange section 13A transfers the second fluid Lc from the second fluid introduction passage i2 to the plurality of inter-plate second fluid passages f2 in parallel. And the second fluid Lc, which has passed in parallel through the plurality of inter-plate second flow passages f 2, is discharged from the second fluid outlet passage o 2 in a collective state.
• the exchange section 13A heat is exchanged between the first fluid La (low-concentration absorbent) and the second fluid Lc (high-concentration absorbent) by a multi-pass counterflow method.
• the third fluid Lb is caused to flow in parallel from the third fluid introduction path i3 into the third fluid path f3 between the plates, and the third fluid Lb
• the third fluid Lb which has passed through the fluid path f 3 in parallel, is discharged in a collective state from the third fluid outlet path o 3, whereby the rear heat exchange section 13 B
• the first fluid La (low-concentration absorbing liquid) after heat exchange with the second fluid Lc (high-concentration absorbing liquid) in A is opposed to the third fluid Lb (medium-concentration absorbing liquid) by multiple passes. Heat is exchanged by the flow method.
• the hole p 1 forming the first fluid transfer path m is closed.
• the former heat exchange section 13 A and the latter heat exchanger 13 B are arranged side by side in the laminating direction of the sheet material, while the two heat exchange sections 13 A, 13 B
• the two adjacent plate members 15 located at the boundary of the first fluid passage m close the holes p2 to p4 other than the hole p1 that forms the first fluid passage m.
• the neck d of one hole p1 is a plate material extending to the corresponding hole p1 of the other, and a vacuum-tight airtight space is formed between the plate materials 15 at these boundary portions.
• the airtight space between the plates in the state is made into a vacuum heat insulating layer 16 so as to prevent heat loss due to heat exchange between the first heat exchange section 13A and the second heat exchange section 13B.
• the gap between the peripheral folds of the adjacent plate members 15 and the neck 1 of the holes p1 to p4 and the corresponding hole extending the neck 1 The plate material 15 is laminated with the brazing material sandwiched between the necessary joints such as between p1 and p4, and this laminated plate material is put into a vacuum furnace. Then, the plate material laminate is heated in a vacuum furnace under vacuum to braze the above-mentioned necessary parts by brazing.
• a vacuum heat insulating layer 16 is provided between two adjacent plate members 15 located at the boundary between the first heat exchange unit 13A and the second heat exchange unit 13B.
• three or more adjacent plate members 15 located at the boundary between the heat exchange sections 13A and 13B are each made into a vacuum insulation layer 16 between each other. You may.
• the plate members 15 may be joined to each other to form the two heat exchange sections 13 A, An airtight space may be provided between the plate members 15 located at the boundary of the 13B, and a vacuum heat insulating layer 16 may be formed by extracting air from the airtight space.
• the specific degree of vacuum of the vacuum heat insulating layer 16 may be appropriately determined from various conditions and the like.
• the present invention is not limited to the vacuum insulation layer 16.
• the plates 15 located at the boundary between the front heat exchange section 13 A and the rear heat exchange section 13 B are connected to each other.
• a heat insulating material or a gas may be filled between the plates to form a heat insulating layer between the plates 15.
• the number of parallel fluid paths f 1 and f 2 in the first heat exchange section 13 A and the number of parallel fluid paths f 1 and f 3 in the second heat exchange section 13 B are required.
• the number may be determined according to the heat exchange amount, and is not limited to the number of parallel rows shown in the above-described embodiment.
• various methods can be applied as a specific method of brazing and joining the plate members 15 under a vacuum atmosphere.
• the gas may be appropriately determined according to various conditions.
• the three-fluid plate heat exchanger according to the present invention is applicable not only to heat exchange between absorbents in an absorption refrigerator, but also to heat exchange of various fluids. Industrial applicability
• the first fluid is stacked by laminating the two fluids and alternately flowing two fluids depending on the plate material.
• the present invention relates to a three-fluid plate heat exchanger for exchanging heat with a third fluid after exchanging heat with a second fluid.
• the present invention is applied to a refrigerator such as an absorption refrigerator. It is possible.

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• 1998
  • 1998-12-08 JP JP34827798A patent/JP3936088B2/ja not_active Expired - Fee Related
• 1999
  • 1999-12-08 DE DE69936288T patent/DE69936288D1/de not_active Expired - Lifetime
  • 1999-12-08 WO PCT/JP1999/006864 patent/WO2000034729A1/ja active IP Right Grant
  • 1999-12-08 EP EP99959689A patent/EP1054225B1/en not_active Expired - Lifetime
  • 1999-12-08 CN CNB998027758A patent/CN1172158C/zh not_active Expired - Fee Related

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