AU2014271242A1 - Heat exchanger and method for demisting - Google Patents

Heat exchanger and method for demisting Download PDF

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Publication number
AU2014271242A1
AU2014271242A1 AU2014271242A AU2014271242A AU2014271242A1 AU 2014271242 A1 AU2014271242 A1 AU 2014271242A1 AU 2014271242 A AU2014271242 A AU 2014271242A AU 2014271242 A AU2014271242 A AU 2014271242A AU 2014271242 A1 AU2014271242 A1 AU 2014271242A1
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AU
Australia
Prior art keywords
case
section
heat exchanger
gas
separation structure
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.)
Abandoned
Application number
AU2014271242A
Inventor
Robert Moestam
Olaf Stallmann
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.)
General Electric Technology GmbH
Original Assignee
General Electric Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Technology GmbH filed Critical General Electric Technology GmbH
Publication of AU2014271242A1 publication Critical patent/AU2014271242A1/en
Assigned to GENERAL ELECTRIC TECHNOLOGY GMBH reassignment GENERAL ELECTRIC TECHNOLOGY GMBH Alteration of Name(s) of Applicant(s) under S113 Assignors: ALSTOM TECHNOLOGY LTD
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/1405—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification in which the humidity of the air is exclusively affected by contact with the evaporator of a closed-circuit cooling system or heat pump circuit
    • 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
    • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/14—Collecting or removing condensed and defrost water; Drip trays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
    • F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F17/00—Removing ice or water from heat-exchange apparatus
    • F28F17/005—Means for draining condensates from heat exchangers, e.g. from evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F2003/144—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only
    • F24F2003/1446—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only by condensing
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0038—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for drying or dehumidifying gases or vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/06—Safety or protection arrangements; Arrangements for preventing malfunction by using means for draining heat exchange media from heat exchangers

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

12 B13/266-0 The heat exchanger (1) comprises a case (2) with at least a case inlet (3) and at least a case outlet (4), a separation structure (6) located within the case (2) 5 defining a first section (7) and a second section (8), a bundle of tubes (10) or other means for heat transfer housed within the first section (7). The first section (7) has the case inlet (3) and the second section (8) has the case outlet (4) and a liquid drainage (16). The heat 10 exchanger also has channels (17) having longitudinal axes (19) directed towards a side of the case (2). (Figure 9) 1/4 B] 3/266-0 12 Fig. 1 16 15 9 G 3 6 4 Fig. 2

Description

1 B13/266-0 HEAT EXCHANGER AND METHOD FOR DEMISTING TECHNICAL FIELD The present disclosure relates to a heat exchanger and 5 a method for demisting. The heat exchanger is for cooling or heating a gas, preferably a compressed gas such as C0 2 . BACKGROUND 10 EP 2 365 269 discloses a heat exchanger with a case having its inner part divided in two sections by a baffle. In a first section there is housed a tube bundle for a cooling fluid, and in the second section there is provided a demister and a liquid drainage. The demister extends 15 horizontally within the second section and can for example be defined by a wire mesh. During operation, a gas such as CO 2 enters the first section, it is cooled when passing through the tube bundle, then it passes into the second section by overcoming the 20 baffle and in the second section the gas is demisted. Liquid is collected and removed at the bottom of the second section and gas is removed from the top of the second section. 25 SUMMARY The inventors have found a way to improve demisting of 2 B13/266-0 the gas, such that the liquid dragged by the gas moving out of the second section of the heat exchanger of the present description is limited and preferably is reduced when compared with the liquid dragged by the gas moving out of 5 the heat exchangers of the prior art. These and further aspects are attained by providing a heat exchanger and a method in accordance with the accompanying claims. 10 BRIEF DESCRIPTION OF THE DRAWINGS Further characteristics and advantages will be more apparent from the description of a preferred but non exclusive embodiment of the heat exchanger and method, illustrated by way of non-limiting example in the 15 accompanying drawings, in which: Figures 1 and 2 show different examples of heat exchangers; Figure 3 shows a separation structure between a first and a second section of the heat exchanger; 20 Figure 4 to 6 show cross sections through respectively lines IV-IV, V-V and VI-VI of figure 3; Figures 7 and 8 are a front view and a perspective view of a diverter, Figures 9 and 10 show the gas circulation through the 25 second section of the heat exchanger.
3 B13/266-0 DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS With reference to the figures, these show a heat exchanger 1 comprising a case 2 with at least a case inlet 3 for a gas such as CO 2 (other gas is anyhow possible) and 5 at least a case outlet 4. A separation structure 6 located within the case 2 defines a first and a second section 7, 8. The first section 7 houses a bundle of tubes 10; the tubes of the bundle of tubes 10 are preferably U-shaped and 10 have one end connected to an inlet 11 and another end connected to an outlet 12 for a cooling or heating fluid (the bent part of the U-shaped tubes is not shown). In the example shown the inlet 11 and outlet 12 are on the same side of the heat exchanger 1, naturally different 15 embodiments are possible for the tubes of the bundle of tubes 10 (for example the tubes can have a shape different from the U-shape) and for the inlet 11 and/or outlet 12 position. In addition, instead of the bundle of tubes 10 any means for transferring heat can be used; for example 20 plates implementing the Ziepack system from Alfa Laval can be used. Advantageously, between the case inlet 3 and bundle of tubes 10 a distributor 9 is provided. In the example the distributor 9 is defined by a perforated plate that 25 distributes the gas entering the case 2 over the whole first section 7. For this reason the perforated plate is 4 B13/266-0 preferably non-uniformly perforated. In fact, the non uniform flow upstream of the distributor 9 requires a non uniformly perforated plate to render the flow downstream of the distributor 9 uniform. 5 The tubes of the bundle of tubes 10 have one end connected to and supported by a wall 15 delimiting the first section 7, and another part connected to a plate or a different support or to the separation structure 6. The second section 8 has the case outlet 4 and a 10 liquid drainage 16. Preferably the second section 8 is defined by an empty volume (to promote gas circulation). The heat exchanger has one or more channels 17 for directing a gas G passing from the first section 7 into the second section 8 towards the sides of the case 2. The 15 channel or channels 17 have a longitudinal axis 18 directed towards a side of the case 2. Advantageously, the heat exchanger 1 has two channels 17 with longitudinal axes 18 directed towards opposite sides of the case 2. 20 For example, the axes 18 define an angle A between 5 35 degree with the side of the case 2. This angle A allows the tangential flow of the gas along the case 2. The separation structure 6 includes walls 22 extending from the top of the case 2 and a diverter 25 at the bottom 25 of the case 2. The channels 17 are defined by the diverter 25.
5 B13/266-0 The walls 22 separate the first section 7 from the second section 8 preventing gas G flow at the upper part of the case 2. Below the walls 22, there is positioned the diverter 25. 5 Advantageously the diverter 25 has a wedge shape; this shape allows the gas to be diverted towards the case 2, at opposite sides thereof. Naturally also other shapes are possible for the diverter 25, for example the diverter 25 can be a wall or baffle, a cylindrical element, etc. 10 In order to help gas circulation through the heat exchanger 1, the case inlet 3 is positioned at the top of the case 2 and the case outlet 4 is also provided at the top of the case 2. In order to help circulation through the second 15 section 8, the case outlet 4 is adjacent the separation structure 6. In order to help liquid gathering, the liquid drainage 16 is provided at the bottom of the case 2 and is adjacent the separation structure 6. 20 The liquid drainage 16 includes for example a liquid collector and a pipe for liquid removal; the pipe is typically provided with a valve. Figure 2 shows an example of a heat exchanger 1 similar to the one of figure 1. In addition, this heat 25 exchanger is provided with a second liquid drainage 26 at the first sector 7, at the bottom of the case 2 and 6 B13/266-0 adjacent the separation structure 6. The liquid drainage 26 can be similar to the liquid drainage 16, but it can have different dimension and/or shape and/or liquid collector/protector devices from the 5 liquid drainage 16. The operation of the heat exchanger 1 is apparent from that described and illustrated and is substantially the following. In the following reference to the embodiment of figure 2 is made, the operation of the embodiment of figure 10 1 is similar to the one described. The gas G to be cooled enters the case 2 through the case inlet 3 and when passing through the distributor 9 it is spread over the whole first section 7. Thus the gas G, while flowing through the tube bundle 15 10, is cooled; cooling causes condensation (gas typically contains water and/or other condensable components). Liquid that is condensed drops at the bottom of the first section and is collected at the second liquid drainage 26. The position of the second liquid drainage 26 close to the 20 separation structure 6 helps liquid collection, because the flowing gas G drags the liquid. The gas G thus passes through the channels 17. The channels 17 preferably have a substantially constant cross section (see figures 4 through 6). 25 When passing through the channels 17 the gas G is diverted towards the sides of the case 2. Thus the gas G, 7 B13/266-0 while circulating through the second section 8, is diverted to follow the case 2 from purely axial direction to a direction tangential the case 2. Thus the gas diverted by the diverter 25 follows the case 2 (i.e. it flows parallel 5 to it) . While flowing parallel to the case 2, due to the case 2 curvature, the droplets undergo centrifugal forces that separate them from the gas and push them against the case 2 (figure 9, upper part) . This causes liquid droplets L dragged by the gas G to be separated from the gas G and 10 to drip along the case 2 (figure 9, lower part). Typically these droplets L form a liquid film that drips towards the bottom of the second section 8. The position of the liquid drainage 16 promotes liquid gathering, because also after separation of the droplets 15 from the gas G the liquid droplets and liquid film are pushed by the gas G towards the liquid drainage 16. The present disclosure also refers to a method for demisting a gas G passing through the heat exchanger 1. According to the method, the channels 17 direct the gas G 20 that passes from the first section 7 into the second section 8 towards the sides of the case 2. Naturally the features described may be independently provided from one another. In practice the materials used and the dimensions can 25 be chosen at will according to requirements and to the state of the art.
8 B13/266-0 REFERENCE NUMBERS 1 heat exchanger 2 case 3 case inlet 5 4 case outlet 6 separation structure 7 first section 8 second section 9 distributor 10 10 bundle of tubes 11 inlet 12 outlet 15 wall 16 liquid drainage 15 17 channel 18 axis 22 wall 25 diverter 26 second liquid drainage 20 G gas L liquid droplets

Claims (11)

1. A heat exchanger (1) comprising a case (2) with at least a case inlet (3) and at least a case outlet (4), a separation structure (6) located within the 5 case (2) defining a first section (7) and a second section (8), a bundle of tubes (10) or other means for heat transfer housed within the first section (7), wherein the first section (7) has the case inlet (3) and the second section (8) has the case outlet 10 (4) and a liquid drainage (16), characterised by comprising at least a channel (17) having a longitudinal axis (18) directed towards a side of the case (2).
2. The heat exchanger (1) of claim 1, characterized by 15 comprising two channels (17) having longitudinal axes directed towards opposite sides of the case (2).
3. The heat exchanger (1) of claim 1 or 2, characterized in that the separation structure (6) includes at least a wall (22) extending from the top of the case 20 (2) and at least a diverter (25) at the bottom of the case (2), the at least a diverter (25) defining the at least a channel (17).
4. The heat exchanger (1) of claim 3, characterized in that the diverter (25) has a wedge shape. 25
5. The heat exchanger (1) of claim 1, characterized in that the case outlet (4) is provided at the top of 10 B13/266-0 the case (2) and is adjacent the separation structure (6).
6. The heat exchanger (1) of claim 1, characterized in that the liquid drainage (16) is provided at the 5 bottom of the case (2) and is adjacent the separation structure (6).
7. The heat exchanger (1) of claim 1, characterized by comprising a second liquid drainage (26) at the first sector (7). 10
8. The heat exchanger of claim 7, characterized in that the second liquid drainage (26) is provided at the bottom of the case (2) and is adjacent the separation structure (6).
9. The heat exchanger of claim 1, characterized in that 15 the at least a channel (17) has substantially constant cross section.
10. The heat exchanger of claim 1, characterized in that the longitudinal axis (18) of the at least a channel (17) defines an angle (A) between 5-35 degree with 20 the side of the case (2).
11. A method for demisting a gas (G) passing through a heat exchanger (1), the heat exchanger (1) comprising a case (2) with at least a case inlet (3) and at least a case outlet 25 (4), a separation structure (6) located within the case (2) defining a first section (7) and a second 11 B13/266-0 section (8), a bundle of tubes (10) or other means for heat transfer housed within the first section (7), wherein the first section (7) has the case inlet (3) and the second section (8) has the case outlet 5 (4) and a liquid drainage (16), the heat exchanger comprising at least a channel (17) for directing a gas passing from the first section (7) into the second section (8), wherein the heat exchanger (1) comprises at least a channel (17) having a 10 longitudinal axis (18) directed towards a side of the case (2), the method being characterized in that the at least a channel (17) directs the gas (G) passing from the first section (7) into the second section (8) towards 15 the side of the case (2).
AU2014271242A 2014-02-14 2014-12-02 Heat exchanger and method for demisting Abandoned AU2014271242A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14155144.0A EP2908081A1 (en) 2014-02-14 2014-02-14 Heat exchanger and a method for demisting
EP14155144.0 2014-02-14

Publications (1)

Publication Number Publication Date
AU2014271242A1 true AU2014271242A1 (en) 2015-09-03

Family

ID=50101772

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2014271242A Abandoned AU2014271242A1 (en) 2014-02-14 2014-12-02 Heat exchanger and method for demisting

Country Status (5)

Country Link
US (1) US20150233587A1 (en)
EP (1) EP2908081A1 (en)
CN (1) CN104848727A (en)
AU (1) AU2014271242A1 (en)
CA (1) CA2874601A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108592250A (en) * 2018-06-26 2018-09-28 沃逸新能源科技（江苏）有限公司 A kind of special dehumidification module of capillary air-conditioning

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63178759U (en) * 1987-05-08 1988-11-18
SU1460570A1 (en) * 1987-06-01 1989-02-23 Московский Институт Химического Машиностроения Evaporator/condenser for ammonia synthesis cycle
US5327957A (en) * 1992-08-10 1994-07-12 Enfab, Inc. Integral heat exchanger
US7841585B2 (en) * 2003-02-21 2010-11-30 Shell Oil Company Separation tray
EP2482008B1 (en) * 2008-01-11 2014-10-08 Johnson Controls Technology Company Evaporator
JP2010249414A (en) * 2009-04-15 2010-11-04 Tlv Co Ltd Heat exchanger
EP2365269A1 (en) * 2010-03-03 2011-09-14 Alstom Technology Ltd Heat exchanging and liuid separation apparatus
CN202630717U (en) * 2012-06-21 2012-12-26 山西阳煤丰喜肥业(集团)有限责任公司 Steam condenser

Also Published As

Publication number Publication date
EP2908081A1 (en) 2015-08-19
CN104848727A (en) 2015-08-19
CA2874601A1 (en) 2015-08-14
US20150233587A1 (en) 2015-08-20

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Legal Events

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MK1 Application lapsed section 142(2)(a) - no request for examination in relevant period