WO1995035463A1 - An evaporator for liquid gases - Google Patents

An evaporator for liquid gases Download PDF

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Publication number
WO1995035463A1
WO1995035463A1 PCT/DK1995/000243 DK9500243W WO9535463A1 WO 1995035463 A1 WO1995035463 A1 WO 1995035463A1 DK 9500243 W DK9500243 W DK 9500243W WO 9535463 A1 WO9535463 A1 WO 9535463A1
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WO
WIPO (PCT)
Prior art keywords
container
gas
central portion
room
outlet
Prior art date
Application number
PCT/DK1995/000243
Other languages
French (fr)
Inventor
Jan Baagø JØRGENSEN
Original Assignee
Kosan Teknova A/S
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 Kosan Teknova A/S filed Critical Kosan Teknova A/S
Priority to AU27330/95A priority Critical patent/AU2733095A/en
Publication of WO1995035463A1 publication Critical patent/WO1995035463A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • 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
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0646—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0123—Mounting arrangements characterised by number of vessels
    • F17C2205/013—Two or more vessels
    • F17C2205/0134—Two or more vessels characterised by the presence of fluid connection between vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0332—Safety valves or pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0304—Heat exchange with the fluid by heating using an electric heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/0393—Localisation of heat exchange separate using a vaporiser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0439—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/013—Reducing manufacturing time or effort

Definitions

  • the present invention relates to an evaporator for liquid gases of the type comprising a substantially closed cylindrical container having walls of heat-conducting material and with an inlet for liquid gas and an outlet for evaporated gas positioned in the vicinity of either end of the container, said container being divided into at least two flow ducts by means of an interior room-divider also of heat-conducting material and having at least one axially extending duct for receiving a thermostat-controlled electric heating element, a gas temperature sensor arranged in the gas flow path between the inlet and the outlet and electric power cords for the heating element with thermostat sensor and the gas temperature sensor extending to a housing connected with an end wall of the container.
  • this known gas heater as already mentioned is comparatively complicated and costly to manufacture, it also has a comparatively high energy consumption on account of the way in which the room has been divided. Furthermore, it is in respect of the flow less advantageous that the gas inlet and the gas outlet are positioned at the same end of the container.
  • DE Patent No. 40 29 260 discloses an electrically heated evaporator, in which the gas inlet and the gas outlet are positioned at either end of the container, and which container by means of two concentric tubes forms an annular flow path between the gas inlet and the gas outlet. Between said inlet and outlet the gas is heated by a centrally positioned heating element.
  • An increase of the volume flow capacity of this known evaporator takes place either by increasing the gap spacing of the tubes or by providing several concentric tubes with accompanying electric heating element next to each other. Inlet to and outlet from these annular flow paths take place via a manifold-like pipe branch system, which does considerably complicate the manufacture.
  • an increase in the volume flow capacity requires more than one heating element, which increases the costs in manufacture of this known evaporator.
  • only the use of a limited number of concentric tubes is allowed, as the evaporator would otherwise make even very large space requirements when being mounted in existing installations.
  • the room divider is constituted by a core element comprising a central portion fastened to said end wall and having a central bore for receiving the heating element and radially extending room-dividing rib portions which reach the wall of the container in heat-transferring contact therewith and which divide the annular room around the central portion into a number of parallel and axial flow ducts substantially evenly distributed in the peripheral direction, said rib portions extending over the major part of the length of the container with the exception of the two end portions situated opposite the gas inlet and the gas outlet, respectively.
  • the whole evaporator can be produced from comparatively few and uncomplicated parts comprising the cylindrical container wall, which may be a tube piece of a suitable heat-conducting material, the core element itself which on the major part of its length is provided with protruding rib portions and which may be manufactured as profiles formed by extruding or by extrusion, preferably of the same heat-conducting material as the container wall, in particular aluminium, and two end walls, one of which serves for fastening the housing holding the electric installations.
  • the cylindrical container wall which may be a tube piece of a suitable heat-conducting material
  • the core element itself which on the major part of its length is provided with protruding rib portions and which may be manufactured as profiles formed by extruding or by extrusion, preferably of the same heat-conducting material as the container wall, in particular aluminium, and two end walls, one of which serves for fastening the housing holding the electric installations.
  • this design allows in a simple way the core element which during operation will acquire a higher temperature than the container wall, to expand thermally without damaging influence on the container wall.
  • the construction is further simplified thereby that the gas flow takes place in one direction through the container, transverse flow passages being thus not needed in the room-divider.
  • the walls of the container and the core element with the central portion and room- dividing rib portions are extruded aluminium profiles, which brings about the advantage that evaporators with varying capacity may be provided by cutting these elements into desired lengths.
  • the evaporator according to the invention has the advantage that it is intended for being mounted vertically with the gas inlet at the bottom and the gas outlet at the top.
  • the entire evaporator can be produced comparatively slim, it does not make big requirements as to space and is easy to adapt to existing gas installations.
  • the further advantage is obtained that the remaining gas in liquid phase is easy to collect in the lower end portion of the container.
  • Figs. 2 and 3 show cross sections along the lines II- II and III-III in Fig. 1.
  • Fig. 1 shows the build-up of an embodiment of the evaporator according to the invention which substantially consists of a container 1 with a substantially cylindrical container wall 2, which at the ends is closed by a first end wall 3 and a second end wall 4.
  • a gas inlet 5 is provided in the end facing the first end wall 3 and in the other end a gas outlet 6.
  • the gas inlet 5 and the gas outlet 6 are designed as connecting branches connected fixedly with the container wall 2 and which serve for interconnection with pipes, not shown, for liquid gas to be evaporated and gas evaporated in the evaporator, respectively.
  • a connecting branch 7 for a safety valve has been provided in the container wall 2 in a similar way.
  • the end wall 4 is connected with a housing 8 for the electrical installations necessary for operation.
  • the housing 8 is preferably made as a pressure- resisting, i.e. explosion-proof casing.
  • a room-divider in the form of a core element 9 is provided within the container 1, said room-divider consisting of a central portion 10 with a central bore 11 adapted to receive an electric heating element 12, and a suitable number of rib portions 13 extending radially from the periphery, said rib portions being integral with the central portion 10 and having an exterior edge 13a which can be brought into heat transferring contact with the container wall 2 by thermal expansion, the clearance between the edge 13a and the container wall 2 amounting for instance to > 0.1 mm.
  • Fig. 3 is shown how the rib portions 13, the cross-section of which is double-concave, between them form a corresponding number of mutually parallel and axial flow ducts 14.
  • the rib portions 13 are designed in such a way that they both form an advantageous flow passage and simultaneously make up large heat- tramsferring surfaces, whereby an effective evaporation of the liquid gas is ensured.
  • Both the container wall 2 and the core element 9 are made from material which transfers heat well, preferably from extruded aluminium profiles.
  • the core element 9 extends through the major part of the container 1 from a point right after the gas inlet 5 in the flow direction, and by means of one end of the central portion 10 is detained in a penetration 4a in the end wall 4, through which the heating element 12 protrudes into the housing 8, where it is connected with electric wires (not shown) for heating the core element 9 and the container wall 2.
  • a gas temperature sensor 18 i's as will be seen from Figs. 1 and 2 fastened with one end to the end wall 4, where it is connected with measuring instruments (not shown) for reading the temperature of the gas.
  • the gas temperature sensor 18 extends in axial direction into the flow duct situated farthest away from the gas outlet 6 in such a way that it is positioned in the flow passage defined by the circular segment 16. This results in that gas flowing in the ducts 14 closer to the gas outlet 6 after leaving the ducts is forced through the slot 17 in a direction towards the circular segment 16, whereby the gas from all ducts passes the sensor 18, which results in that the temperature read is an average of the temperature in the various flow ducts 14.
  • a temperature sensor 20 is embedded in the central portion 10, said temperature sensor providing via wires and control means (not shown) in the housing 8 the thermostatic control of the electric heating element 12.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

An evaporator for liquid gases comprises a closed cylindrical heat-conducting container (1) with an inlet (5) for liquid gas and an outlet (6) for evaporated gas positioned in the vicinity of either end of the container (1). By means of an interior room-divider (9) in the form of a heat-conducting core element (9), comprising a central portion (10) detained in an end wall (4) of the container, said central portion having a central bore (11) for receiving a heating element (12) and room-dividing rib portions (13) extending radially from the central portion, which portions reach the wall (2) of the container (1) in heat-transferring contact therewith. The annular room between the central portion (10) and the wall of the container (1) is divided into a number of parallel and axial flow ducts (14), which are evenly distributed in the peripheral direction and extend over the major part of the length of the container (1) with the exception of two end portions positioned opposite the gas inlet (5) and the gas outlet (6), respectively. A gas temperature sensor (18) is arranged in one of the ducts. The walls (2) of the container (1) and the core element (9) with the central portion (10) may preferably be made from extruded aluminium pieces.

Description

AN EVAPORATOR FOR LIQUID GASES
The present invention relates to an evaporator for liquid gases of the type comprising a substantially closed cylindrical container having walls of heat-conducting material and with an inlet for liquid gas and an outlet for evaporated gas positioned in the vicinity of either end of the container, said container being divided into at least two flow ducts by means of an interior room-divider also of heat-conducting material and having at least one axially extending duct for receiving a thermostat-controlled electric heating element, a gas temperature sensor arranged in the gas flow path between the inlet and the outlet and electric power cords for the heating element with thermostat sensor and the gas temperature sensor extending to a housing connected with an end wall of the container.
In many installations for liquid gas, for instance larger liquefied petroleum gas installations and certain types of natural gas installations it is in particular at high volumetric load necessary to carry out evaporation of the liquid gas in order to transform it into a gaseous phase.
From published International Patent Application WO 79/00702 an electrically heated evaporator of the above kind is known, in which the gas inlet and the gas outlet are provided in the same end of the container and in which the container by means of a single transverse partition wall is divided in two main flow ducts which are passed by the gas in opposite flow directions. The wall of the container and the transverse partition wall are designed as integrated parts, which to a considerable extent complicates the manufacture. This is further enhanced by the fact that the gas flow from the duct connected with the inlet to the duct connected with the outlet takes place through flow passages having venturi-shaped cross-section in the partition wall itself, which in this case is provided with ducts for receiving three heating elements. In addition to the fact that this known gas heater as already mentioned is comparatively complicated and costly to manufacture, it also has a comparatively high energy consumption on account of the way in which the room has been divided. Furthermore, it is in respect of the flow less advantageous that the gas inlet and the gas outlet are positioned at the same end of the container.
DE Patent No. 40 29 260 discloses an electrically heated evaporator, in which the gas inlet and the gas outlet are positioned at either end of the container, and which container by means of two concentric tubes forms an annular flow path between the gas inlet and the gas outlet. Between said inlet and outlet the gas is heated by a centrally positioned heating element. An increase of the volume flow capacity of this known evaporator takes place either by increasing the gap spacing of the tubes or by providing several concentric tubes with accompanying electric heating element next to each other. Inlet to and outlet from these annular flow paths take place via a manifold-like pipe branch system, which does considerably complicate the manufacture. Furthermore, an increase in the volume flow capacity requires more than one heating element, which increases the costs in manufacture of this known evaporator. Furthermore, only the use of a limited number of concentric tubes is allowed, as the evaporator would otherwise make even very large space requirements when being mounted in existing installations.
According to the invention these drawbacks are eliminated by the provision of an evaporator of the type stated above, which evaporator is characteristic in that the room divider is constituted by a core element comprising a central portion fastened to said end wall and having a central bore for receiving the heating element and radially extending room-dividing rib portions which reach the wall of the container in heat-transferring contact therewith and which divide the annular room around the central portion into a number of parallel and axial flow ducts substantially evenly distributed in the peripheral direction, said rib portions extending over the major part of the length of the container with the exception of the two end portions situated opposite the gas inlet and the gas outlet, respectively.
By letting the room-divider consist of a separate core element the whole evaporator can be produced from comparatively few and uncomplicated parts comprising the cylindrical container wall, which may be a tube piece of a suitable heat-conducting material, the core element itself which on the major part of its length is provided with protruding rib portions and which may be manufactured as profiles formed by extruding or by extrusion, preferably of the same heat-conducting material as the container wall, in particular aluminium, and two end walls, one of which serves for fastening the housing holding the electric installations.
Furthermore, this design allows in a simple way the core element which during operation will acquire a higher temperature than the container wall, to expand thermally without damaging influence on the container wall.
The construction is further simplified thereby that the gas flow takes place in one direction through the container, transverse flow passages being thus not needed in the room-divider.
In a preferred embodiment the walls of the container and the core element with the central portion and room- dividing rib portions are extruded aluminium profiles, which brings about the advantage that evaporators with varying capacity may be provided by cutting these elements into desired lengths.
Flowwise the evaporator according to the invention has the advantage that it is intended for being mounted vertically with the gas inlet at the bottom and the gas outlet at the top. As the entire evaporator can be produced comparatively slim, it does not make big requirements as to space and is easy to adapt to existing gas installations. Hereby the further advantage is obtained that the remaining gas in liquid phase is easy to collect in the lower end portion of the container. The invention will be explained in detail in the following with reference to the schematic drawing, in which Fig. 1 is a longitudinal section of an embodiment of a gas evaporator according to the invention, whereas
Figs. 2 and 3 show cross sections along the lines II- II and III-III in Fig. 1.
Fig. 1 shows the build-up of an embodiment of the evaporator according to the invention which substantially consists of a container 1 with a substantially cylindrical container wall 2, which at the ends is closed by a first end wall 3 and a second end wall 4. In the container wall 2 a gas inlet 5 is provided in the end facing the first end wall 3 and in the other end a gas outlet 6. The gas inlet 5 and the gas outlet 6 are designed as connecting branches connected fixedly with the container wall 2 and which serve for interconnection with pipes, not shown, for liquid gas to be evaporated and gas evaporated in the evaporator, respectively. Opposite the gas outlet 6 a connecting branch 7 for a safety valve has been provided in the container wall 2 in a similar way. The end wall 4 is connected with a housing 8 for the electrical installations necessary for operation. The housing 8 is preferably made as a pressure- resisting, i.e. explosion-proof casing.
A room-divider in the form of a core element 9 is provided within the container 1, said room-divider consisting of a central portion 10 with a central bore 11 adapted to receive an electric heating element 12, and a suitable number of rib portions 13 extending radially from the periphery, said rib portions being integral with the central portion 10 and having an exterior edge 13a which can be brought into heat transferring contact with the container wall 2 by thermal expansion, the clearance between the edge 13a and the container wall 2 amounting for instance to > 0.1 mm. In Fig. 3 is shown how the rib portions 13, the cross-section of which is double-concave, between them form a corresponding number of mutually parallel and axial flow ducts 14. The rib portions 13 are designed in such a way that they both form an advantageous flow passage and simultaneously make up large heat- tramsferring surfaces, whereby an effective evaporation of the liquid gas is ensured.
Both the container wall 2 and the core element 9 are made from material which transfers heat well, preferably from extruded aluminium profiles.
From Fig. 1 will further be seen that the core element 9 extends through the major part of the container 1 from a point right after the gas inlet 5 in the flow direction, and by means of one end of the central portion 10 is detained in a penetration 4a in the end wall 4, through which the heating element 12 protrudes into the housing 8, where it is connected with electric wires (not shown) for heating the core element 9 and the container wall 2. The protruding rib portions 13, which thus leave two end portions 21 and 22 of the container 1 without any room-division, end at an axial distance d from a transverse dividing plate 15 covering the cross section of the container apart from a circular segment 16 between the free edge of the partition plate 15 and the container wall 2 in the part of the container 1 situated farthest away from the gas outlet 6 for the formation of a first circumferential slot 17 surrounding the central portion 10.
A gas temperature sensor 18 i's as will be seen from Figs. 1 and 2 fastened with one end to the end wall 4, where it is connected with measuring instruments (not shown) for reading the temperature of the gas. The gas temperature sensor 18 extends in axial direction into the flow duct situated farthest away from the gas outlet 6 in such a way that it is positioned in the flow passage defined by the circular segment 16. This results in that gas flowing in the ducts 14 closer to the gas outlet 6 after leaving the ducts is forced through the slot 17 in a direction towards the circular segment 16, whereby the gas from all ducts passes the sensor 18, which results in that the temperature read is an average of the temperature in the various flow ducts 14. Then the gas is led into a second circumferential slot 19 between the partition plate 15 and the end wall 4 to the gas outlet 6. Furthermore, a temperature sensor 20 is embedded in the central portion 10, said temperature sensor providing via wires and control means (not shown) in the housing 8 the thermostatic control of the electric heating element 12.

Claims

C L A I M S
1. An evaporator for liquid gases of the type comprising a substantially closed cylindrical container (1) having walls (2) of heat-conducting material and with an inlet (5) for liquid gas and an outlet (6) for evaporated gas positioned in the vicinity of either end of the container (1) , said container being divided into at least two flow ducts (14) by means of an interior room-divider (9) also of heat-conducting material and having at least one axially extending duct (11) for receiving a thermostat-controlled electric heating element (12) , a gas temperature sensor (18) being arranged in the gas flow path between the inlet (5) and the outlet (6) , and electric power cords for the heating element (12) with thermostat sensor and gas temperature sensor (18) extending to a housing (8) connected with an end wall (4) of the container (1) , c h a r a c t e r i z e d in that the room-divider is constituted by a core element (9) comprising a central portion (10) fastened to said end wall (4) and having a central bore (11) for receiving the heating element (12) and radially extending room-dividing rib portions (13) which reach the wall (2) of the container (l) in heat- transferring contact therewith and which divide the annular room around the central portion (10) into a number of parallel and axial flow ducts (14) substantially evenly distributed in the peripheral direction, said rib portions (13) extending over the major part of the length of the container (1) with the exception of the two end portions situated opposite the gas inlet (5) and the gas outlet (6) , respectively.
2. An evaporator according to claim 1, c h a r a c t e r i z e d in that the walls (2) of the container (1) and the core element (9) with the central portion (10) and room-dividing rib portions (13) are made from preferably extruded aluminium pieces.
3. An evaporator according to claim 1 or 2, c h a r a c t e r i z e d in that the core element (9) is detained in the end wall (4) positioned at the gas outlet (6).
4. An evaporator according to claims 1, 2 or 3, c h a r a c t e r i z e d in that the container (1) is designed for vertical mounting, the gas inlet (5) being positioned at the bottom and the gas outlet (6) at the top.
5. An evaporator according to any of the preceding claims, c h a r a c t e r i z e d in that in the end of the container, where the gas outlet (6) is provided, a safety valve is connected to the container.
6. An evaporator according to any of the preceding claims, c h a r a c t e r i z e d in that the number of parallel, axial flow ducts (14) is at least 4.
7. An evaporator according to any of the preceding claims, c h a r a c t e r i z e d in that the gas temperature sensor (18) is detained in said end wall (4) and arranged in the flow duct positioned farthest away in the cross-section of the container from the gas outlet (6) , whereas a partition plate (15) is placed between the gas outlet (6) and the ducts situated closer thereto in such a way that the flow from all ducts passes the sensor.
PCT/DK1995/000243 1994-06-17 1995-06-15 An evaporator for liquid gases WO1995035463A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU27330/95A AU2733095A (en) 1994-06-17 1995-06-15 An evaporator for liquid gases

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK71194A DK71194A (en) 1994-06-17 1994-06-17 Evaporator for liquid gases
DK0711/94 1994-06-17

Publications (1)

Publication Number Publication Date
WO1995035463A1 true WO1995035463A1 (en) 1995-12-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1995/000243 WO1995035463A1 (en) 1994-06-17 1995-06-15 An evaporator for liquid gases

Country Status (3)

Country Link
AU (1) AU2733095A (en)
DK (1) DK71194A (en)
WO (1) WO1995035463A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100425906C (en) * 2004-04-23 2008-10-15 上海凌云瑞升燃烧设备有限公司 Light oil combustion machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582613A (en) * 1968-10-11 1971-06-01 Othmar W Pies Fluid-heating device
US3835294A (en) * 1973-04-06 1974-09-10 Binks Mfg Co High pressure electric fluid heater
WO1979000702A1 (en) * 1978-03-03 1979-09-20 Dick Ind Inc Sam Electric liquefied petroleum gas vaporizer
US4480172A (en) * 1982-06-17 1984-10-30 Henry Ciciliot Electric heat exchanger for simultaneously vaporizing two different fluids

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582613A (en) * 1968-10-11 1971-06-01 Othmar W Pies Fluid-heating device
US3835294A (en) * 1973-04-06 1974-09-10 Binks Mfg Co High pressure electric fluid heater
WO1979000702A1 (en) * 1978-03-03 1979-09-20 Dick Ind Inc Sam Electric liquefied petroleum gas vaporizer
US4480172A (en) * 1982-06-17 1984-10-30 Henry Ciciliot Electric heat exchanger for simultaneously vaporizing two different fluids

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100425906C (en) * 2004-04-23 2008-10-15 上海凌云瑞升燃烧设备有限公司 Light oil combustion machine

Also Published As

Publication number Publication date
AU2733095A (en) 1996-01-15
DK71194A (en) 1995-12-18

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