JP2008045786A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of improving heat exchanging efficiency by combining indirect heat exchange and direct heat exchange. <P>SOLUTION: A coiled cooling fluid tube 3 is mounted inside of a heat exchanging container 1 connected with a steam supply tube 2. The cooling fluid tube 3 is formed by a gas-liquid separation film through which vapor penetrates but liquid does not penetrate. Further the cooling fluid tube 3 is connected with a cooling fluid supply tube 7 at its lower end and with a hot water discharge tube 8 at its upper end. The steam supplied into the heat exchanging container 1 is cooled by indirect heat exchange at an outer surface of the cooling fluid tube 3, and the steam partially penetrates through pores of the gas-liquid separation film and is cooled by direct heat exchange with the cooling fluid in the cooling fluid tube 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention eliminates the steam that can be trapped with moyamoya by condensing the steam remaining in the various steam using devices and the re-evaporated steam generated from the high temperature drain by heat exchange with a cooling fluid such as water. Alternatively, the present invention relates to an apparatus that effectively uses the retained heat of steam by separately using hot water whose temperature has been increased by exchanging heat with a cooling fluid.

In the conventional heat exchanger, an ejector is attached to a cooling fluid pipe for supplying a cooling fluid to the heat exchange container, and the suction port of the ejector is communicated with a steam staying place in the heat exchange container. By sucking the staying steam inside, the convection of steam inside the heat exchange vessel is promoted, and the heat transfer coefficient can be improved.

In the above conventional heat exchanger, the heat exchange between the cooling fluid and the steam in the heat exchange vessel is all indirect heat exchange, so the heat exchange efficiency cannot be improved to a predetermined value or more. There was a problem that the heat exchange amount of steam was limited.
JP 2004-53029 A

  The problem to be solved is to provide a heat exchanger that can improve the heat exchange efficiency by combining the heat exchange between the cooling fluid and the steam in the heat exchange vessel with indirect heat exchange and direct heat exchange. Is to get.

  In the present invention, steam and a cooling fluid are supplied to a heat exchange vessel, and the vapor is condensed by exchanging heat with the cooling fluid.In the heat exchange vessel, a coiled cooling fluid conduit is disposed, The cooling fluid conduit is formed of a gas-liquid separation membrane that allows vapor to permeate but does not allow liquid to permeate.

  In the present invention, the cooling fluid pipe in the heat exchange vessel is formed of a gas-liquid separation membrane that allows vapor to permeate but does not allow liquid to pass through. Since heat is exchanged and cooled, a part of the vapor passes through the gas-liquid separation membrane and is directly heat exchanged and cooled with the cooling fluid in the cooling fluid pipe, so that heat can be exchanged efficiently.

  The present invention uses a cooling fluid conduit formed by a gas-liquid separation membrane. As the gas-liquid separation membrane, a hydrophobic porous membrane conventionally used in a membrane distillation method or the like can be used. . Further, the diameter and length of the cooling fluid conduit can be appropriately selected according to the amount and temperature of the steam to be cooled.

  In FIG. 1, a heat exchanger is constituted by a heat exchange container 1, a steam supply pipe 2 that supplies steam to be condensed, and a cooling fluid pipe 3 disposed in the heat exchange container 1.

At the center of the heat exchange vessel 1 is provided a cylindrical pipe-like atmosphere open pipe 6 in an open state at the upper and lower ends. The cooling fluid pipe 3 formed in a coil shape is disposed on the outer periphery of the atmosphere opening pipe 6, and the cooling fluid supply pipe 7 is connected to the lower end of the cooling fluid pipe 3, and the upper end is connected to the hot water discharge pipe 8. The cooling fluid supplied from the cooling fluid supply pipe 7 reaches the discharge pipe 8 through the coiled cooling fluid pipe 3.

The coiled cooling fluid pipe 3 is formed of a gas-liquid separation membrane that allows vapor to permeate but does not allow liquid to permeate. Therefore, although not shown on the outer surface of the cooling fluid pipe 3, the cooling fluid pipe 3 has a large number of fine pores that allow vapor as a gas to pass through but do not allow liquid to pass through.

An overflow pipe 9 is disposed below the atmosphere opening pipe 6. The overflow pipe 9 is a straight straight line, and the upper end 11 is opened into the atmosphere opening pipe 6, and the lower end 5 is connected to a drain discharge location outside the heat exchange container 1.

  The steam supply pipe 2 is connected to an outlet side of a steam using device (not shown), a re-evaporation tank or the like, and supplies steam into the heat exchange container 1 for condensation. The steam supplied from the steam supply pipe 2 into the heat exchange container 1 is cooled by the cooling fluid pipe 3, condensed and drained into the drain reservoir 10 at the bottom.

  In this case, the steam in the heat exchange vessel 1 is indirectly heat-exchanged and cooled on the outer surface of the cooling fluid pipe 3, and a part of the steam passes through the pores of the gas-liquid separation membrane to be cooled. Heat is directly exchanged with the cooling fluid in 3 to be cooled.

  The cooling fluid whose temperature has been increased by removing heat from the steam in the cooling fluid pipe 3 is supplied from the discharge pipe 8 to a predetermined hot water use location.

The drain in the drain reservoir 10 rises in the atmosphere open pipe 6 due to the pressure of the supplied steam and is discharged from the upper end 11 of the overflow pipe 9 to the drain discharge location.

The block diagram which shows the Example of the heat exchanger of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchange container 2 Steam supply pipe 3 Cooling fluid pipe 6 Atmospheric release pipe 7 Cooling fluid supply pipe 8 Hot water discharge pipe 9 Overflow pipe

Claims (1)

Supplying steam and a cooling fluid to a heat exchange vessel and condensing the vapor by heat exchange with the cooling fluid. In the heat exchange vessel, a coiled cooling fluid conduit is disposed, and the cooling fluid tube A heat exchanger characterized in that the passage is formed of a gas-liquid separation membrane that allows vapor to permeate but does not allow liquid to permeate.

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