EP3492854A1 - Échangeur de chaleur détachable multi-processus et plaque d'échange de chaleur dédiée associée - Google Patents

Échangeur de chaleur détachable multi-processus et plaque d'échange de chaleur dédiée associée Download PDF

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Publication number
EP3492854A1
EP3492854A1 EP17833477.7A EP17833477A EP3492854A1 EP 3492854 A1 EP3492854 A1 EP 3492854A1 EP 17833477 A EP17833477 A EP 17833477A EP 3492854 A1 EP3492854 A1 EP 3492854A1
Authority
EP
European Patent Office
Prior art keywords
plate
pass
lateral
heat exchanger
heat transfer
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Withdrawn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
EP17833477.7A
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German (de)
English (en)
Other versions
EP3492854A4 (fr
Inventor
Xingcun HUANG
Wai Tak YU
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.)
Ies Engineering (hong Kong) Ltd
Original Assignee
Ies Engineering (hong Kong) Ltd
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Publication date
Application filed by Ies Engineering (hong Kong) Ltd filed Critical Ies Engineering (hong Kong) Ltd
Publication of EP3492854A1 publication Critical patent/EP3492854A1/fr
Publication of EP3492854A4 publication Critical patent/EP3492854A4/fr
Withdrawn legal-status Critical Current

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    • 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
    • F28D9/0037—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 conduits for the other heat-exchange medium also being formed by paired plates touching each other
    • 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
    • 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
    • F28D9/0031—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
    • F28D9/0056—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 with U-flow or serpentine-flow inside conduits; with centrally arranged openings on the plates
    • 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
    • F28F11/02—Arrangements for sealing leaky tubes and conduits using obturating elements, e.g. washers, inserted and operated independently of each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
    • F28F3/044—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being pontual, e.g. dimples
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
    • F28F3/046—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being linear, e.g. corrugations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/08—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
    • F28F3/083—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning capable of being taken apart
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/08—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
    • F28F3/10—Arrangements for sealing the margins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/24—Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates

Definitions

  • the present disclosure relates to a removable plate heat exchanger, and more specifically relates to a multi-pass removable plate heat exchanger without a need of installing connections to a mobile pressure plate side, and a dedicated heat transfer plate therefor.
  • a plate and frame heat exchanger is generally referred to as a plate heat exchanger (PHE), which was originated from the European food industry over 60 years ago, when there was a demand for a heat exchanger that was efficient, energy-saving, structurally compact, easy to clean, and adaptable to change of design conditions.
  • PHEs could satisfy such initial requirements.
  • those basic requirements are still present, and the PHEs have been widely used in various industrial fields throughout the world, e.g., refrigerating, heating and ventilation, air-conditioning, and oil cooling.
  • the plate heat exchanger Due to its characteristics such as high heat transfer efficiency, low heat loss, light-weighted and compact structure, less space demand, ease of assembly and cleaning, wide range of operating parameters, and long service life, etc., the plate heat exchanger is an ideal device for liquid-to-liquid and liquid-to-gas heat exchange. Under a same pressure loss, the plate heat exchanger has a heat transfer coefficient 3 to 5 times higher than that of a tubular heat exchanger, but with only a fraction of space requirement; besides, the heat recovery rate of the plate heat exchanger may amount to 90% above.
  • Common plate heat exchangers available in the market are formed by stacking a series of metal sheets with certain corrugated patterns.
  • Variations of plate heat exchangers mainly include removable (frame) types and brazed/welded types.
  • Profiles of heat transfer plate mainly include herringbone corrugated patterns, horizontally corrugated patterns, and dimpled patterns.
  • the removable plate heat exchanger is the most commonly used compact heat exchanger type for heating, cooling or heat recovery in various industrial fields. The popularity of this type of exchanger is attributed to its various unique and advantageous properties, including a high heat transfer efficiency, a modular structure, ease of assembly and disassembly, convenience for cleaning and maintenance, and a high degree of flexibility in its sizing and configuration to match a particular application duty.
  • a plate pack of a typical removable plate heat exchanger comprises a series of sequentially assembled metal sheets, where an elastic sealing gasket is installed between every two metal sheets to thereby form a hot fluid flow channel and a cold fluid flow channel that are mutually alternating and isolated. Sealing gaskets are mounted to seal corner ports and the periphery of heat transfer plates to prevent mixing of the cold and hot fluids as well as leakage of any fluid through the periphery to the ambient.
  • the plate pack is tightly compressed by a frame system to provide pressure bearing and sealing capabilities.
  • the frame system comprises mainly: a front fixed pressure plate, a rear mobile pressure plate, a top carrying beam, and clamp bolts distributed around.
  • clamp bolts are tightened to an appropriate pressure degree to secure all flow channels free from leakage, without crushing the heat transfer plates.
  • Connections of different types and shapes are provided on the fixed pressure plate and/or the mobile pressure plate to allow the cold and hot fluid mediums to enter and exit the heat exchanger.
  • a conventional removable plate heat exchanger generally comprises: 1) a plate pack including a leading plate 5', an end plate 4', and a plurality of regular heat transfer plates 3'; 2) a frame system which comprise a fixed pressure plate 1', a mobile pressure plate 2', a top guide bar 6', a bottom guide bar 7', a back post 8', and a clamp bolt 9'; 3) ancillary components which comprise a lock washer 10', a fastening nut 11', a support foot 13', a roller assembly 14', and a protection board 15', etc.; and 4) four connections 16' attached to the fixed pressure plate to allow the cold and hot fluid media to enter and exit the heat exchanger.
  • the leading plate 5', the end plate 4' and the regular heat transfer plate 3' all comprise two components: a metal sheet and a sealing gasket, wherein the metal sheet is a thin metal sheet impressed with a corrugated surface, a sealing groove, and ports.
  • the corrugated profile is the most important feature of the heat transfer plate, as the profile not only helps to intensify the heat transfer by enhancing turbulence, but also improves the rigidity of the thin sheet, thereby enhancing the pressure bearing capacity of the plate heat exchanger.
  • the enhanced turbulence also helps to reduce formation of sediments or fouling, which creates a "self-cleaning" effect;
  • the sealing gasket is installed in the sealing groove along the periphery of the metal sheet so as to seal the periphery between the metal sheets, thereby preventing the fluids from leaking to the external; all or some of the corner ports are sealed according to flow configurations such that the cold and hot fluids flow along their alternate channels.
  • the sealing gasket in port areas can be designed into a two-channel sealing structure with a draining hole leading to the ambient. The media may flow out from the draining hole in case of a leakage from the first line of sealing, thus reducing the chance of mixing of the cold and hot media.
  • the draining hole can also serve as an early leakage warning and detection mechanism.
  • different glue types may be applied to the sealing gasket depending on different working media and operating temperatures.
  • the plate pack significantly influences the overall performance and working condition of the plate heat exchanger. Therefore, the heat transfer and the circulation characteristic of the removable plate heat exchanger may be adjusted and optimized by changing the following parameters: 1) geometric profiles of the heat transfer plate; 2) dimension (width and length) of the heat transfer plate; 3) dimension of the corner ports; 4) number of plates; and 5) respective numbers of flow passes for the cold and hot flow channels.
  • the flow pass and the flow channel in the art are two technical terms associated with each other but having different meanings.
  • the flow pass refers to a group of parallel channels where any given medium flows in the same direction, while the flow channel refers to a medium flow channel formed by two adjacent sheets inside the plate heat exchanger.
  • a plurality of flow channels are connected in parallel or in series to form different combinations of cold and hot medium channels.
  • Fig. 1A shows a single pass design of the removable plate heat exchanger
  • Fig. 1B represents, by arrows, the flow directions of respective cold and hot fluids, wherein in the single pass design, the cold and hot fluids flow in opposite directions, thereby generating more favorable temperature profiles for heat transfer.
  • the rear end plate 4' and the leading plate 5' are not only different from the heat transfer plate 3' in terms of quantity, but also different from the heat transfer plate 3' in terms of the shape of sealing gasket.
  • the sealing gasket s of the leading plate 5' as shown in Fig. 1B need to seal all of the four corner ports, while the sealing gasket of a common heat transfer plate 3' only seals some of the corner ports; in addition, the four corner ports of the rear end plate 4' do not penetrate through the metal thin sheet, while the corner ports of the common heat transfer plate 3' have to penetrate through the metal thin sheet.
  • the rear end plate, the leading plate, and the heat transfer plate will not be specifically distinguished unless confusion is otherwise caused, but are generally referred to as a heat transfer plate.
  • a heat transfer plate with a relatively high aspect ratio is needed.
  • a maximum length of the heat transfer plate is limited to a feasible aspect ratio, because if the heat transfer plate has too high an aspect ratio, the heat exchanger becomes unstable in structure and spatially less optimized for installation; therefore, the height of the heat transfer plate is more frequently limited by the available height for installing the device.
  • This limitation may be alleviated by designing a multi-pass heat exchanger, such that the cold and hot fluids are turned into opposite directions by a stopper plate in each flow channel.
  • Fig. 2 shows a schematic structure and the working principle of a conventional three-pass removable plate heat exchanger.
  • the heat exchanger comprises a plate pack 3, a fixed pressure plate 1, and a mobile pressure plate 2.
  • the cold fluid enters the heat exchanger from a cold fluid inlet connection 4 attached to the fixed pressure plate 1, flows upwards in the first flow pass, flows downwards in the second flow pass, and flows upwards again in the third flow pass, and finally flows out of the heat exchanger from a cold fluid outlet connection 7 on the mobile pressure plate 2.
  • the hot fluid flows in from a hot fluid inlet connection 9 attached to the mobile pressure plate 2, flows reversely through the three passes, and then flows out of the heat exchanger via a hot fluid outlet connection 5 attached to the fixed pressure plate 1.
  • the plate pack is divided into a plurality of sections between the fixed pressure plate and the mobile pressure plate.
  • a stopper plate 6 is mounted between two adjacent sections to force a fluid to change its flow direction between passes.
  • the stopper plate 6 differs from a regular heat transfer plate 3 in that two corner ports of the stopper plate 6 are blocked.
  • conventional multi-pass designs have a number of problems and inconveniences in practical applications.
  • a conventional multi-pass design always needs to install a cold fluid outlet connection 7 and a hot fluid inlet connection 9 on the mobile pressure plate 2.
  • the inlet and outlet connections for the cold and hot fluid, respectively have to be attached to the opposite ends of a multi-pass heat exchanger.
  • the flow directions of the cold and hot fluid flow channels at the opposite sides of each stopper plate 6 are in co-current flows (local co-currency) 11.
  • Such local co-current flows 11 deteriorate to a certain extent the overall heat transfer efficiency of the heat exchanger.
  • the conventional multi-pass design needs a series of flow reversal, compression, expansion, and re-distribution in the port area of each stopper plate, which causes an additional flow pressure drop.
  • the present disclosure provides a novel structure and design of a multi-pass heat transfer plate, which allows for more efficient and easier maintenance process, by allowing multi-pass removable plate heat exchanger without the need of arranging connections on a mobile pressure plate.
  • the present disclosure further provides a novel heat transfer plate construction, which has an equivalent or better heat transfer performance compared with a traditional multi-pass plate, but without key drawbacks of the traditional multi-pass plate heat exchanger.
  • the present disclosure provides a heat transfer plate for a multi-pass removable plate heat exchanger.
  • the heat transfer plate has a plurality of lateral partitions, where a plurality of mutually communicative lateral-pass partitions or mutually isolated longitudinal pass partitions may be formed by specially shaped gaskets.
  • a multi-pass removable plate heat exchanger without a need of arranging connections at the mobile pressure plate may be constructed.
  • the present disclosure further provides a specially shaped and constructed gasket to implement a multi-pass removable plate heat exchanger without a need of arranging connections at the mobile pressure plate.
  • a multi-pass removable plate heat exchanger which comprises: a fixed pressure plate, a mobile pressure plate, and a plate pack sandwiched between the fixed pressure plate and the mobile pressure plate via clamp bolts.
  • the plate pack further comprises a plurality of lateral-pass plates configured with specially shaped sealing gaskets to form two or more successively communicating lateral partitions.
  • the lateral-pass plates are assembled to form the plate pack with mutually alternating cold and heat fluid flow channels, the number of passes on the multi-pass removable plate heat exchanger being equal to the number of lateral partitions on each lateral-pass plate.
  • connections are only arranged on the fixed pressure plate, without a need of arranging connections on the mobile pressure plate.
  • the lateral-pass plate may typically have two, three, or four lateral partitions.
  • a multi-pass removable plate heat exchanger which comprises: a fixed pressure plate, a mobile pressure plate, and a plate pack sandwiched between the fixed pressure plate and the mobile pressure plate via clamp bolts.
  • the plate pack further comprises one section of two-zone lateral-pass plates, and (N-1) sections of two-zone lateral-partition plates.
  • Each two-zone lateral-pass plate is configured with specially shaped sealing gaskets to form two mutually communicating lateral partitions.
  • Each two-zone lateral-partition plate is configured with specially shaped sealing gasket to form two mutually isolated lateral partitions.
  • the section of two-zone lateral-pass plates is allocated immediately adjacent to the mobile pressure plate to force both hot fluid and cold fluids to make a U-turn, while (N-1) sections of two-zone lateral-partition plates are arranged adjacent to the fixed pressure plate.
  • the thus assembled plate pack creates mutually alternating cold and heat fluid flow channels, where each fluid enters the heat exchanger via the fixed pressure plate, flows towards the mobile pressure plate along one side of the partition, makes a U-turn upon reaching the mobile pressure plate, and then flows back along the other side of the partition, and lastly exits the heat exchanger via the fixed pressure plate.
  • the total number of passes achieved in this novel type of the multi-pass removable plate heat exchanger is equal to 2N, where N is a natural number greater than or equal to 2.
  • connections are only arranged on the fixed pressure plate, without a need of arranging connections on the mobile pressure plate.
  • the sections with lateral-pass plates are allocated immediately adjacent to the mobile pressure plate, and while the remaining sections of lateral-partition plates are allocated adjacent to fixed pressure plate to achieve the remaining flow passes.
  • a lateral-pass plate specific for the novel type of multi-pass removable plate heat exchanger wherein the heat transfer plate is a lateral-pass plate, wherein flat groove patterns are provided at the periphery and in the interior of the lateral-pass plate for configuring sealing gaskets to thereby form two or more successively communicative lateral partitions.
  • a lateral-partition plate specific for the novel type of multi-pass removable plate heat exchanger wherein the heat transfer plate is a lateral-partition plate, wherein flat groove patterns are provided at the periphery and in the interior of the lateral-partition plate for configuring sealing gaskets to thereby form two or more mutually isolated lateral partitions
  • the heat transfer plate may possess different thermal-hydraulic performance characteristics through variations in geometrical profiles, wherein heat transfer plates with different geometrical profiles may also be arranged in a hybrid fashion within the same plate pack to form a mixed plate pack.
  • the geometrical profile variations may include, but not limited to chevron corrugation angles, circular or irregular dimples, studs, or other structures with the effect of enhancing heat transfer efficiency.
  • sealing and/or partitioning functionalities of the sealing gaskets may be partially or completely replaced by other seal structures or mechanisms.
  • the other seal structures or mechanisms may include, but not limited to brazing, welding, diffusion bounding or mechanical contact sealing.
  • a sealing gasket specific for the lateral-pass plate is provided, wherein the sealing gasket is situated inside flat grooves provided at the periphery and in the interior of the lateral-pass plate, such that the lateral-pass plate is formed with two or more lateral partitions that are successively in communication.
  • a sealing gasket specific for the lateral-partition plate is provided, wherein the sealing gasket is situated within flat grooves provided at the periphery and in the interior of the lateral-partition plate, such that the lateral-partition plate is formed with two or more lateral partitions that are mutually isolated.
  • the multi-pass removable plate heat exchanger (PHE) constructed according to the present disclosure has the following advantages:
  • the multi-pass heat exchanger according to the present disclosure may be easily disassembled for cleaning and repair like a conventional single-pass heat exchanger;
  • Increased effective heat transfer area because i) with fewer corner ports in lateral-pass plate, the percentage of non-heat transfer area is reduced; ii) with decreased peripheral length of the heat transfer plates, heat loss through the external area in direct contact with the ambient is reduced; iii) internal gasket grooves can be made very narrow, which reduces loss in effective heat exchange areas;
  • Reduced flow pressure drop because the turn of flow direction on a lateral-pass plate is relatively gentle and the fluid velocities are substantially constant during each lateral turn, there is no apparent compression and expansion in distribution areas, and the additional pressure drop due to directional turn associated with multiple passes is smaller;
  • a multi-pass heat exchanger that is thermally more efficient and easier-to-maintain may be constructed according to the present disclosure, thereby satisfying the demand of more efficient and more easy-to-service heat exchangers in a wide range of applications such as energy recovery, process isolation, and pressure breaker, etc.
  • the present disclosure overcomes the following technical bias regarding a multi-pass plate heat exchanger: the multi-pass plate heat exchanger needs to arrange inlet and outlet interfaces for cold and hot fluids, as well as the connections therefor, at two opposite sides of the fixed pressure plate and mobile pressure plate of a heat exchanger.
  • This technical bias is extensively seen in prior technical literatures describing multi-pass heat exchangers, but the Inventor of the present disclosure fundamentally overthrows this technical bias through innovative technical solutions.
  • a heat transfer plate for a multi-pass removable plate heat exchanger according to the present disclosure has a plurality of lateral partitions, which, in combination with specially shaped gaskets, may form a plurality of communicative flow channels or mutually isolated flow channels.
  • the heat transfer plate in the prior art does not have a plurality of mutually communicative or isolated lateral partitions, which is an integral zone for circulating cold and hot fluids.
  • a key component for solving the technical problem of a conventional multi-pass plate heat exchanger is a heat transfer plate having a plurality of lateral partitions. These lateral partitions are further fitted with specially shaped sealing gaskets, such that a plurality of mutually communicative lateral-pass flow channels may be implemented between two adjacent plates, and such a special heat transfer plate may be referred to as a lateral-pass plate.
  • a multi-pass plate heat exchanger without a need of arranging connections on the mobile pressure plate may be built, the number of its passes corresponding to the number of lateral partitions on each lateral-pass plate. The working principle of the lateral-pass plate of the present disclosure is described below.
  • Fig. 3A shows a lateral-pass plate having two lateral partitions using a hot side flow channel as an example
  • Fig. 3B shows a lateral-pass plate with two lateral partitions using a cold side flow channel as an example.
  • a hot fluid 15 flows into a right-side partition of the heat transfer plate 12 from a hot side inlet corner port 14 at the upper right corner.
  • Elastic sealing gaskets 16 are mounted in a gasket groove at a periphery of a metal sheet of the lateral-pass plate 12 to seal the periphery between metal sheets for preventing leakage of the fluid to the external, and to seal relevant corner ports according to flow configurations such that the cold and hot fluids flow along respective flow channels, thereby preventing the hot fluid 15 from contacting with the cold side fluid flowing through an adjacent cold side corner port 13.
  • the sealing gaskets 16 and inner partition gaskets 17 guide the hot fluid 15 to flow towards a bottom portion of the sheet.
  • Inner partition gaskets 17 and an opening 18 between peripheral gaskets let the hot fluid 15 to laterally flow towards the left partition of the heat transfer plate.
  • the hot fluid 15 further flows upwards from here and finally flows out of the hot side outlet corner port 19; likewise, the elastic sealing gasket 16 may prevent the hot fluid 15 from contacting with the cold side fluid flowing through a neighboring cold side corner port.
  • the opening 18 that changes the pass direction has a relatively gentle turn of flow direction; and the fluid velocity is substantially constant during direction turn, wherein there is no apparent compression and expansion of fluids through the distribution area; therefore, the increase in pressure drop due to direction turn of multiple passes is relatively small.
  • the pass for the cold side fluid as shown in Fig. 3B is just opposite to the pass for the hot side fluid as shown in Fig. 3A .
  • the cold fluid 20 flows into the left side partition of the heat transfer plate from the cold side inlet corner port 21 at the upper left corner.
  • the elastic sealing gaskets 16 are configured for preventing the cold fluid 20 from contacting with the hot side fluid flowing through a neighboring hot side corner port.
  • the sealing gaskets 16 and inner partition gaskets 17 guide the cold fluid 20 to flow towards a bottom portion of the sheet.
  • the inner partition gaskets 17 and the opening 18 between peripheral gaskets let the cold fluid 15 to laterally flow towards a right-side partition of the sheet.
  • the cold fluid 20 flows upwards from here and finally flows out of the cold side outlet corner port 22.
  • the circulating areas of the cold and hot fluids are identical but have completely opposite flow directions, a complete counter-current flow configuration is achieved, which in turn leads to a maximal heat transfer potential.
  • Fig. 4 shows an exploded view of a simplified structure of a two-pass heat exchanger using the lateral-pass plate having two lateral partitions as shown in Fig. 3 .
  • the heat exchanger comprises a fixed pressure plate 1, a mobile pressure plate 2, and a plate pack sandwiched between the fixed pressure plate 1 and the mobile pressure plate 2 via clamp bolts, the plate pack being further assembled by a series of lateral-pass plates 12 having two lateral partitions.
  • the heat transfer plates as the rear end plate and the leading plate may be regarded as specially shaped lateral-pass plates 12, and their sealing gaskets and corner port structures may be configured correspondingly as shown in Fig. 1 according to needs.
  • Fig. 4 shows an exploded view of a simplified structure of a two-pass heat exchanger using the lateral-pass plate having two lateral partitions as shown in Fig. 3 .
  • the heat exchanger comprises a fixed pressure plate 1, a mobile pressure plate 2, and a plate pack sandwiched between the fixed pressure plate 1 and the mobile pressure plate
  • each lateral-pass plate 12 itself is used for implementing a lateral U-turn of the flow direction, thereby allowing the hot side and cold side fluid inlet and outlet connections 4, 5, 7, and 9 to be solely arranged at the fixed pressure plate 1 side, such that it is unnecessary to arrange any connections at the mobile pressure plate 2 side; in this way, the multi-pass removable plate heat exchanger according to the present disclosure is as convenient as the conventional single-pass heat exchanger in terms of mounting, piping, assembling, disassembling and maintenance.
  • the lateral-pass plate having two lateral partitions according to the present disclosure may be easily extended to other multi-pass arrangements, e.g., theoretically, the number of lateral partitions of each lateral-pass plate may be increased to 3 or 4 or higher dependent on operating duties. In actual industrial applications, a lateral-pass plate having two to four lateral partitions is possibly the most practical and most economical.
  • Fig. 5A shows a structure and the working principle of a lateral-pass plate having three lateral partitions using a hot flow channel as an example according to an embodiment of the present disclosure
  • Fig. 5B shows a structure and the working principle of a lateral-pass plate having three lateral partitions using a cold flow channel as an example according to an embodiment of the present disclosure.
  • a three-pass heat exchanger using a lateral-pass plate with 3 lateral partitions as shown in Fig. 5 likewise allows the hot side and cold side fluid inlet and outlet connections to be all arranged at the fixed pressure plate side, such that it is unnecessary to arrange any connections to the mobile pressure plate side.
  • the number of passes of the multi-pass heat exchanger that only uses lateral-pass plates corresponds to exactly the number of lateral partitions on each lateral-pass plate, it may be understood that the number of passes of the plate heat exchanger manufactured according to the above embodiments of the present disclosure increases in a lateral direction.
  • the number of passes may arbitrarily increase to any number in the lateral direction theoretically, the lateral-pass plate with 2, 3, or 4 lateral-pass partitions is likely most practical and economical due to unfavorable dimension increase in horizontal direction at higher pass numbers; in other words, the number of passes of the plate heat exchanger employing lateral-pass plates is preferably 2 to 4.
  • the Inventor of the present disclosure further provides an alternative embodiment based on a combined implementation of lateral-pass plates and lateral-partition plates, such that the number of passes of the multi-pass plate heat exchanger manufactured by the present disclosure may increase without limitation.
  • this alternative embodiment of the present disclosure will be specifically described.
  • FIG. 6A and Fig. 6B show a construction structure and a working principle of the heat transfer plate in this alternative embodiment, wherein Fig. 6A shows a heat transfer plate having two lateral partitions using a hot flow channel as an example according to an alternative embodiment of the present disclosure; Fig. 6B shows a heat transfer plate having two lateral partitions using a cold flow channel as an example according to an embodiment of the present disclosure.
  • this alternative embodiment uses a same heat transfer plate, but arrangements of corner ports and the shapes of sealing gaskets are slightly different; particularly, the internal partition gasket 17 extends through the entire length of the pass, such that the lateral flow of the fluid is completely blocked.
  • the two-zone lateral-pass plate shown in Fig. 3 and the lateral-partition plate shown in Fig. 6 in combination a higher number of passes meeting demanding thermal duty requirements can be implemented, e.g., 4, 6, 8, 10 or any even number of passes.
  • the number of passes achievable for the entire heat exchanger can be viewed as any number, without being limited to even number only, if each heat transfer plate is used as the reference.
  • the lateral-pass plates shown in Fig. 3 are to be situated adjacent to the mobile pressure plate side, while the remaining passes using the lateral-partition plates shown in Fig. 6 are to be situated adjacent to the fixed pressure plate.
  • the lateral-pass plate in this multi-pass construction allows the cold and hot fluids to make a 180° U-turn upon reaching the mobile pressure plate so as to avoid the need of having any connections on the mobile pressure plate.
  • Fig. 7 shows a structure and the working principle of a six-pass removable plate heat exchanger according to an alternative embodiment of the present disclosure.
  • the heat exchanger comprises a fixed pressure plate 1, a mobile pressure plate 2, and a plate pack 3 sandwiched between the fixed pressure plate 1 and the mobile pressure plate 2 via clamp bolts, wherein the plate pack 3 further comprises one section of two-zone lateral-pass plates for the two passes (third and fourth passes) directly adjacent to the mobile pressure plate, and two sections of lateral-partition plates for the remaining other passes (first and sixth passes, and second and fifth passes).
  • Hot side and cold side fluid inlet and outlet connections 4, 5, 7, and 9 are all arranged on the fixed pressure plate 1, such that it is unnecessary to arrange any connections on the mobile pressure plate 2.
  • the lateral-pass plates are only used in the third and fourth passes immediately adjacent to mobile pressure plate side, while the lateral-partition plates are used in other passes; in this alternative multi-pass design, the lateral-pass plate is for facilitating a longitude U-turn of the flow direction, to allow the hot side and cold side fluid inlet and outlet connections 4, 5, 7, and 9 to be all arranged on the fixed pressure plate 1, such that it is unnecessary to arrange any connections on the mobile pressure plate 2; in this way, the multi-pass removable plate heat exchanger according to this alternative multi-pass construction is as convenient as the conventional single-pass heat exchanger in terms of mounting, piping, assembling, disassembling and maintenance.
  • the heat transfer plate described by the present disclosure has the following two typical application examples.
  • the heat transfer plate required by the two application examples may be provided by a same plate pressing die, except for the number of corner ports needed to be cut, and the shapes and configurations of sealing gaskets.
  • the first application example there are only lateral passes without longitudinal passes. In other words, only lateral-pass heat transfer plates are used, while partition heat transfer plate is not used.
  • the number of lateral passes is not limited theoretically according to the principle of the present disclosure, the present application example is more suitable for implementing a multi-pass removable plate heat exchanger with 2, 3, or 4 passes in actual applications due to consideration of unfavorable dimension increase in horizontal direction.
  • lateral passes not only the lateral passes but also the longitudinal passes are employed; in other words, lateral-pass heat transfer plates and partition heat transfer plates are used in combination.
  • a second application example of the present disclosure is suitable for circumstances requiring a higher number of passes, including 4, 6, 8, 10, ... 2N (any even number) passes (the number of passes achievable for the entire heat exchanger can be viewed as any number, without being limited to even number only, if each heat transfer plate is used as the reference.). In this application example, there is no structural limitation on the maximum number of passes.
  • the lateral-pass plate for a multi-pass removable plate heat exchanger is provided with flat grooves at the periphery and in the interior to allow sealing gaskets to form mutually communicative two or more lateral partitions; while the lateral-partition plate for the multi-pass removable plate heat exchanger is provided with flat grooves at the periphery and in the interior to allow the sealing gaskets to form two mutually isolated partitions.
  • the heat transfer plate pattern or corrugation may be customized and optimized according to actual needs of the heat exchange circumstances; for a scenario of large flow rates with small allowable pressure drops, a plate profile with a small pressure resistance should be selected; otherwise, a plate model with a large pressure resistance is selected. Additionally, when selecting suitable plates, those with too small a single-plate area should not be selected; otherwise, too many plates will be needed, and consequently the inter-plate fluid velocity would be too small, and the heat transfer coefficient would be too low; this issue should be particularly addressed for large heat exchangers.
  • the heat transfer plate for the multi-pass removable plate heat exchanger may possess different thermal performances through variations in geometrical profiles, wherein the heat transfer plates with different geometrical profiles may be combined within the same plate pack in a hybrid fashion.
  • Variations in plate geometrical profiles may include employing different chevron corrugation angles, circular or irregular dimple, studs, or other structures for enhancing heat transfer coefficient.
  • sealing and partitioning functionalities of the sealing gaskets may be partially or completely replaced by other seal structures or mechanisms, which may include, but not limited to, brazing, welding, diffusion bounding or mechanical contact sealing.
  • a single-wall PHE In the application examples of the present disclosure, illustration will be made with a single-wall PHE as an example. In heat exchange scenarios, which require absolute prevention of mixing of two media (e.g., household water application), a double-wall PHE is mostly adopted so as to effectively prevent leakage and mixing of fluids. To those skilled in the art, the pass structures and designs of the lateral-pass plate and lateral-partition plate as disclosed in the present disclosure may also be directly applied to the double-wall PHE.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP17833477.7A 2016-07-28 2017-07-20 Échangeur de chaleur détachable multi-processus et plaque d'échange de chaleur dédiée associée Withdrawn EP3492854A4 (fr)

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CN201610607994.2A CN107664445A (zh) 2016-07-28 2016-07-28 多流程可拆卸板式换热器及其专用换热板
PCT/CN2017/093650 WO2018019174A1 (fr) 2016-07-28 2017-07-20 Échangeur de chaleur détachable multi-processus et plaque d'échange de chaleur dédiée associée

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US (1) US20190310023A1 (fr)
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DE102019201387A1 (de) * 2019-02-04 2020-08-06 Mahle International Gmbh Stapelscheibe für einen Stapelscheibenwärmeübertrager und zugehöriger Stapelscheibenwärmeübertrager
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WO2018019174A1 (fr) 2018-02-01
US20190310023A1 (en) 2019-10-10
AU2017304787A1 (en) 2019-05-30
CN107664445A (zh) 2018-02-06

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