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WO1998006991A1 - Recuperateur de chaleur, et assemblage, installation et nettoyage d'un tel recuperateur - Google Patents

Recuperateur de chaleur, et assemblage, installation et nettoyage d'un tel recuperateur Download PDF

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Publication number
WO1998006991A1
WO1998006991A1 PCT/NO1997/000203 NO9700203W WO9806991A1 WO 1998006991 A1 WO1998006991 A1 WO 1998006991A1 NO 9700203 W NO9700203 W NO 9700203W WO 9806991 A1 WO9806991 A1 WO 9806991A1
Authority
WO
WIPO (PCT)
Prior art keywords
plates
heat exchanger
plate
angle
row
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.)
Ceased
Application number
PCT/NO1997/000203
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English (en)
Inventor
Roar Thoresen
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.)
ROTHOR AS
Original Assignee
ROTHOR AS
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 ROTHOR AS filed Critical ROTHOR AS
Priority to AU38709/97A priority Critical patent/AU3870997A/en
Publication of WO1998006991A1 publication Critical patent/WO1998006991A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the 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
    • F28D9/0006—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 plate-like or laminated conduits being enclosed within a pressure vessel
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents

Definitions

  • the invention relates to a system for the improvement of heat recovery devices. More specifically the invention relates to the design of heat exchangers of the plate type and placement of heat recovery plates in a specially designed recovery plant, as well as the cleaning thereof.
  • the invention relates in particular to heat exchanger plates as discussed in Norwegian Patent No. 178355, but is not limited to this type of plate.
  • Heat recyclers are being used to an increasing extent industrially in order to achieve more efficient utilization of energy that is generated in various processes.
  • Heat recovery devices of the plate type are widely used, and generally consist of plates arranged in a parallel position a uniform distance apart. Between two plates flows the hot medium, and between adjacent plates flows the cold medium which is intended to absorb the energy from the hot medium. These media may be gases or liquids, and a transfer of energy from gas to liquid, or vice versa, may also occur.
  • the heat recovery plates are made of different materials, the most common being various metals, but other materials such as polyester, for example, are used in connection with the present invention.
  • Heat recovery devices of the plate type are the dominant system used today.
  • the cold medium flows on one side of a plate while the hot medium flows on the other side of the plate.
  • the cold and the hot media generally have different directions of flow in relation to each other, in order thereby to produce the best exchange of energy.
  • Heat exchangers of the plate type are described in, for example, the following patents: US 4 858 685, US 5 036 91 1 and SE 466 871.
  • a common feature of these patents is that they are intended for liquid-liquid heat exchangers having high flow rates and substantial pressure falls.
  • the following invention is directed particularly toward the exchange of heat between gases, but it may also be utilized in heat exchange between liquids.
  • a series of heat exchanger plates are mounted side by side with an equal or unequal spacing between them. This row of plates is placed in a heat exchanger housing suited thereto, having separate chambers.
  • the row of plates is disposed at a specific angle ( ⁇ ) in relation to the direction of the gas flow.
  • a corresponding row of plates may be placed on the opposite side, in the same chamber and at the same angle in relation to the inflow direction.
  • the angle ( ⁇ ) between the plate rows may be from 5° to 15°.
  • the horizontal inflowing gas also forms the same angle with the row of plates, i.e., from 5° to 15°.
  • the two rows of plates converge at a point near the end of the heat exchanger housing,
  • a uniform distribution of the flowing gas is attained, thereby subjecting all the plates in the row to approximately the same charge of gas.
  • the two rows of plates forming an angle to each other are placed in a housing, preferably of a cylindrical form.
  • the cylindrical form is well suited in that it takes up substantial pressure differences in a favorable manner.
  • the cylindrical form simplifies the collection of liquid from the heat exchange process, and particularly during washing of the heat exchanger plates.
  • the cylindrical form will also provide for better exterior drainage of precipitation in the form of rain or snow.
  • a cylindrical housing will be easier to transport and to construct.
  • the plates in the present invention are cast with dust repellent contours on the sides that meet the gas flow. These rounded contours ensure that particles do not deposit and attach themselves to the lee side at the inlet between two plates when particle-containing gas flows in at the same time as the inlet pressure is reduced. The rounded contours also provide for a swabbing effect, as these dust repellent contours are pointed or rounded.
  • the plates are provided with a drainage groove. The purpose of this groove, which is preferably situated vertically downward from the rounded contours, it to catch wash water that is applied during operation and is usually easily and undesirably carried in between the plates in the structure by a horizontal gas flow.
  • Figure 1 is an exterior, perspective view of a cylindrical housing, and an alternative embodiment of a hexagonal housing, together with a two-storey alternative.
  • Figure 2 is a cross section through the center of the cylindrical housing, with two rows of heat exchanger plates.
  • Figure 3 is a top view of the transected housing, and shows two rows of heat exchanger plates where the rows form an angle in relation to each other.
  • Figure 4 is a detail view of a heat exchanger plate showing the rounded side and the drainage groove.
  • Figure 5 shows how the heat exchanger plates are positioned side by side and form an angle ⁇ in relation to the incoming gas flow, which is illustrated by arrows.
  • Figure 1 shows a cylindrical housing 10 and an alternative embodiment form with a hexagonal housing 10 resting on a structure of support legs 1 1.
  • the cylindrical form has been selected because it is better suited to sustain internal pressure differences, as compared to a traditional rectangular housing.
  • the cylindrical housing is simpler to construct and provides for better drainage of liquid, both externally and internally.
  • the housing may, for example, be pre-molded in plastic sections which are assembled on site.
  • the diameter of the housing for this purpose may be 10 meters, and the length of the cylinder may be, for example, 40 meters.
  • the invention is not, however, limited to a housing of a cylindrical form; naturally, it is also conceivable to utilize a conventional rectangular or polygonal housing, as shown alternatively in Figure 1 , or a housing of several storeys.
  • Figure 2 shows a transection of the cylindrical housing, viewed along the cylindrical axis.
  • shower heads 16 Above and at the side of the rows of plates are mounted shower heads 16, which at regular intervals provide for the cleaning of the plates. This cleaning may be carried out with water, at further specified times and intervals, and the washing of the plates is done in sections.
  • the wash water collects for further transport and optional purification.
  • Similar shower heads 16 are positioned beside the plates, and these are arranged at an angle in relation to the lateral edges in order to enhance the washing effect.
  • FIG. 3 shows a transectional view of a housing from above.
  • the two rows of heat exchanger plates 15 are positioned at an angle ⁇ in relation to each other. This sharp angle ensures that the incoming hot gas, which is indicated by arrows 20, distributes itself uniformly between all the plates. The angle also ensures that the incoming gas maintains a relatively uniform velocity along the entire row of plates. Because the plates are positioned at an angle in relation to the incoming gas flow, a "swabbing effect" will be achieved, meaning that each heat exchanger plate 15 removes a small portion of the gas flow. This swabbing effect will be further enhanced by the rounded plate edges, which will be explained in more detail in the following.
  • FIG 4 shows in detail how the edge of a heat exchanger plate 15 is formed.
  • the plate edge 27, which is designed to face toward the inflowing gas, has a non-rectangular shape, preferably a curved shape.
  • a heat exchanger plate 15 consists of two parts 28 and 29 which are screwed or nailed and glued together with the aid of a fastening means 31. Between these plates 28 and 29 flows the vertical cold gas 30 in the slot which is formed therein and which is intended to absorb energy from the hot gas (20).
  • a heat exchanger plate is shaped on two sides as a curve, shown as 27, and on the two other sides as 29. When these are mounted together alternately at a 90° angle in relation to the underlying surface, the joint as shown in Figure 4 is formed.
  • the plates are preferably molded from polyester and are provided with heat exchanger ribs as disclosed in Norwegian Patent No. 178355. However, the present invention is not limited to this, and it is conceivable to use conventional plates made of metal.
  • FIG. 5 shows the heat exchanger plates as they are positioned in succession and at an angle in relation to the direction of inflow.
  • the inflowing gas is designated as 20 and enters as illustrated by the arrows.
  • the velocity of this gas may be 12 - 15 m/s at the inlet.
  • Gas 20 is driven inwards into a gradually narrowing space as a result of the sharp angle between the row of plates and the wall. Due to the rounding 27 of the lee side of the plates, the previously mentioned “swabbing effect" is enhanced and contributes toward a uniform distribution of the gas.
  • the velocity of the gas between the plates will decrease to about 4 m/s. When the gas moves around a plate joint, the curved shape will prevent the occurrence of turbulence and thereby reduce the pressure fall.
  • any particles and liquid being brought along with the gas would be caught in the vertical drainage groove 26.
  • This groove will thus serve to remove some of the particles and impurities that would otherwise have been deposited on the plate. A deposited layer of contaminated particles will, over the course of time, result in less effective heat exchange and a greater need for washing of the plates.
  • the drainage groove will also prevent (reduce) the penetration of wash water between the plates.
  • the entire heat exchanger row may, for example, be divided into four sections 35, 36, 37 and 38, as is indicated in Figure 3.
  • the danger of a damaging pressure increase and explosion is eliminated due to the fact that only a limited zone (section) of the entire heat exchanger chamber is supplied with wash water at one time. It may also be the case that some of the sections require more frequent cleaning than others, although the angle should provide for a uniform distribution of the gas along the entire row.
  • the cylindrical housing will also, by virtue of its shape, ensure that any dramatic pressure change that might occur will not have serious consequences.

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

Cette invention se rapporte à un échangeur thermique à contre-courant du type échangeur à plaques dans lequel l'échange thermique entre des gaz se produit lorsque le gaz à écoulement horizontal forme un angle avec la rangée de plaques de l'échangeur thermique. Lesdites plaques de l'échangeur thermique possèdent un bord arrondi du côté faisant face à l'écoulement gazeux.
PCT/NO1997/000203 1996-08-13 1997-08-11 Recuperateur de chaleur, et assemblage, installation et nettoyage d'un tel recuperateur Ceased WO1998006991A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU38709/97A AU3870997A (en) 1996-08-13 1997-08-11 Heat recycler and the assembly, construction and cleaning thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO963373A NO302975B1 (no) 1996-08-13 1996-08-13 Motströmsvarmeveksler av platetypen
NO963373 1996-08-13

Publications (1)

Publication Number Publication Date
WO1998006991A1 true WO1998006991A1 (fr) 1998-02-19

Family

ID=19899707

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1997/000203 Ceased WO1998006991A1 (fr) 1996-08-13 1997-08-11 Recuperateur de chaleur, et assemblage, installation et nettoyage d'un tel recuperateur

Country Status (3)

Country Link
AU (1) AU3870997A (fr)
NO (1) NO302975B1 (fr)
WO (1) WO1998006991A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB488571A (en) * 1937-01-09 1938-07-11 Andrew Swan Improvements in plate heat exchangers for fluids
DE821948C (de) * 1949-08-09 1951-11-22 Artur Doenicke Dampfkondensator
US2595457A (en) * 1947-06-03 1952-05-06 Air Preheater Pin fin heat exchanger
DE1156429B (de) * 1959-12-19 1963-10-31 Daimler Benz Ag Verfahren zum Reinigen von Rekuperativ-Waermetauschern mit einzelnen Waermetauscherelementen
US3430693A (en) * 1965-06-16 1969-03-04 Johnson Construction Co Ab Heat exchange element with condensate collector
FR2178142A1 (en) * 1972-03-28 1973-11-09 Brayton Cycle Improvement Ass Undulating plate heat exchanger - for air cooling of liquids has deflectors for minimising pressure drop
CH599523A5 (fr) * 1975-11-03 1978-05-31 Kernforschungsanlage Juelich
US4128126A (en) * 1975-11-03 1978-12-05 Kernforschungsanlage Julich Gesellschaft M.Beschrankter Haftung Apparatus for support of sheet-metal-type heat exchanger matrices for recuperative heat exchange
US4263967A (en) * 1977-08-23 1981-04-28 Hayes Timber Pty. Limited, Et Al. Heat transfer pack
NO178355B (no) * 1994-02-25 1995-11-27 Rothor Gupex As Varmegjenvinner

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB488571A (en) * 1937-01-09 1938-07-11 Andrew Swan Improvements in plate heat exchangers for fluids
US2595457A (en) * 1947-06-03 1952-05-06 Air Preheater Pin fin heat exchanger
DE821948C (de) * 1949-08-09 1951-11-22 Artur Doenicke Dampfkondensator
DE1156429B (de) * 1959-12-19 1963-10-31 Daimler Benz Ag Verfahren zum Reinigen von Rekuperativ-Waermetauschern mit einzelnen Waermetauscherelementen
US3430693A (en) * 1965-06-16 1969-03-04 Johnson Construction Co Ab Heat exchange element with condensate collector
FR2178142A1 (en) * 1972-03-28 1973-11-09 Brayton Cycle Improvement Ass Undulating plate heat exchanger - for air cooling of liquids has deflectors for minimising pressure drop
CH599523A5 (fr) * 1975-11-03 1978-05-31 Kernforschungsanlage Juelich
US4128126A (en) * 1975-11-03 1978-12-05 Kernforschungsanlage Julich Gesellschaft M.Beschrankter Haftung Apparatus for support of sheet-metal-type heat exchanger matrices for recuperative heat exchange
US4263967A (en) * 1977-08-23 1981-04-28 Hayes Timber Pty. Limited, Et Al. Heat transfer pack
NO178355B (no) * 1994-02-25 1995-11-27 Rothor Gupex As Varmegjenvinner

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DERWENT'S ABSTRACT, No. 94-107720/13, Week 9413; & SU,A,1 556 252 (NOVOS ELECTROTECH INST), 15 January 1993. *
PATENT ABSTRACTS OF JAPAN, Vol. 14, No. 418, M-1022; & JP,A,02 161 293 (HISAKA WORKS LTD), 21 June 1990. *
PATENT ABSTRACTS OF JAPAN, Vol. 6, No. 260, M-180; & JP,A,57 155 099 (GADELIUS K.K.), 25 Sept. 1982. *

Also Published As

Publication number Publication date
AU3870997A (en) 1998-03-06
NO302975B1 (no) 1998-05-11
NO963373D0 (no) 1996-08-13
NO963373L (no) 1998-02-16

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