JP2007078277A - Steam heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam heating device capable of efficiently heating an object to be heated by steam latent heat. <P>SOLUTION: A plurality of narrow pipes 2 with substantially rectangular cross sections are attached in an interior of a horizontally long cylindrical shell 1. A steam supply pipe 3 is connected to the upper part of the shell 1. A suction means connecting pipe 4 is connected to the lower part of the shell 1. A communication pipe 9 is attached for connecting the upper part of the shell 1, and the suction means connecting pipe 4. By injecting heating steam into the narrow pipe 2 in the shell 1 from the steam supply pipe 3, the steam is condensed on the surface of the narrow pipe outer surface, the condensate flows down on the longitudinal rectangle side face of the narrow pipe 2 and does not accumulate like a film on the outer surface in the narrow pipe 2, and the object to be heated can be efficiently heated by the steam latent heat. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a steam heating apparatus that heats an object to be heated by retained latent heat of heating steam in a steam heating chamber.

  The steam heating apparatus is a horizontal arrangement of a plurality of elongate heat transfer tubes inside a heating chamber, and a heating medium is allowed to flow down inside the heat transfer tubes, thereby allowing the steam heating device to be positioned on the outer periphery of the heat transfer tubes. The heated product can be indirectly heated.

In this steam heating device, contrary to the above, the object to be heated flows down inside the heat transfer tube, and the heat medium is sprayed to the outer periphery of the heat transfer tube, so that the object to be heated in the heat transfer tube is removed. When heating, since the cross-sectional shape of the heat transfer tube is circular, the condensate of the heat medium condensed by being deprived of heat at the outer periphery of the heat transfer tube is difficult to drip from the outer periphery of the heat transfer tube. There was a problem that the contact of the heat medium vapor on the outer periphery of the heat transfer tube was hindered, and the latent heat of the heat medium vapor was not reliably transmitted to the object to be heated, resulting in a reduction in heating efficiency.
JP 2002-372384 A

  The problem to be solved is to provide a steam heating device with high heating efficiency by removing from the heat transfer tube surface as quickly as possible the condensate liquid film that disturbs the heat transfer of steam latent heat to the object to be heated. is there.

  The present invention forms a steam heating chamber that heats an object to be heated with steam, and supplies steam for heating to the steam heating chamber. The cross-sectional shape of the thin tube is a flat, substantially rectangular shape.

  In the steam heating apparatus of the present invention, the condensate condensed by taking the heat of the heated object on the surface of the thin tube adheres and stays on the surface of the thin tube by making the cross-sectional shape of the thin tube as the heat transfer tube flat and substantially rectangular. Therefore, the heat exchange with the latent heat of steam is not hindered, and high heating efficiency can be maintained.

  In the present invention, the cross-sectional shape of the thin tube is a flat, substantially rectangular shape, but it is preferable to arrange the rectangular long surface in a direction along the flow direction of the condensate. In addition, the internal shape of the flat rectangle is preferably a shape having a passage that does not hinder the flow of the object to be heated.

  In the present embodiment, a horizontally long hollow cylindrical shell 1 as a steam heating chamber, a thin tube 2 as a heat transfer tube disposed in the shell 1, a steam supply pipe 3 for supplying heating steam into the shell 1, And the vapor | steam heating apparatus is comprised with the suction means connection pipe | tube 4 connected with the suction means which is not shown in figure.

  FIG. 1 shows a longitudinal sectional view of a cylindrical shell 1, and a heated material flow inlet communicating with a thin tube 2 via a tube plate on the front side of FIG. 1 and a tube plate on the back side of FIG. Heated distribution outlets that intervene and communicate with the thin tubes 2 are respectively attached.

  As shown in FIG. 1, the thin tube 2 has a substantially rectangular shape whose cross section is long in the vertical direction, and a plurality of thin tubes 2 are attached uniformly and horizontally in the shell 1. In addition, although the cross-sectional shape of the thin tube 2 in the shell 1 as the evaporative cooling chamber is substantially rectangular as described above, the portion after the tube plate at both ends of the shell 1 may be a conventional circle. Above preferred.

A steam supply pipe 3 is connected to the upper center of the shell 1. A control valve 5 for controlling the amount of steam to be supplied is attached to the steam supply pipe 3. Further, although not shown, an injection nozzle for injecting heating steam to the outer surfaces of all the thin tubes 2 is attached to the shell 1 side end portion 6 of the steam supply tube 3. An object to be heated flowing down in the narrow tube 2 is heated by the steam for heating injected from the steam supply tube 3 to the outer surface of the thin tube 2.

  A suction means connecting pipe 4 is connected to the lower part of the shell 1 and connected to suction means such as a vacuum pump (not shown). In the suction means connecting pipe 4, a steam trap 7 that discharges only the liquid without discharging the steam to the outlet side, and an open / close valve 8 that causes any fluid in the shell 1 to flow down to the downstream suction means side are arranged in parallel. Install. Moreover, the upper part of the shell 1 and the communication pipe | tube 9 which connects the suction means connection pipe | tube 4 are attached. An open / close valve 10 is attached to the communication pipe 9.

  When the object to be heated flowing down the narrow tube 2 is heated, the suction means (not shown) is driven, the inside of the shell 1 is brought into a predetermined reduced pressure state via the suction means connecting tube 4, and the outside of the thin tube 2 is removed from the steam supply pipe 3. The object to be heated is heated by injecting heating steam onto the surface. Thus, the inside of the shell 1 can be heated with low-temperature steam corresponding to the atmospheric pressure or lower, that is, 100 ° C. or lower, by reducing the pressure to the atmospheric pressure or lower by the suction means.

  By making the cross-sectional shape of the narrow tube 2 into a rectangular shape that is long in the vertical direction, the condensate in which the vapor is condensed on the outer surface of the narrow tube can easily flow down along the long side surface portion of the narrow tube 2, and It is possible to prevent the thin film of the condensate from staying and to efficiently heat the object to be heated flowing down the narrow tube 2 with the latent heat of vapor.

The condensate generated by heating the article to be heated is sucked into the suction means through the vapor trap 7 and the suction means connecting pipe 4. Further, non-condensable gas, for example, air staying in the shell 1 is sucked into the suction means through the communication pipe 9 at the top of the shell 1.

The block diagram which shows the Example of the steam heating apparatus of this invention.

Explanation of symbols

1 Shell 2 Narrow tube 3 Steam supply tube 4 Suction means connection tube 5 Control valve 7 Steam trap 9 Communication tube

Claims (1)

Forming a steam heating chamber for heating an object to be heated with steam and supplying steam for heating to the steam heating chamber, a plurality of thin tubes are arranged inside the steam heating chamber, and a cross-sectional shape of the thin tubes A steam heating apparatus characterized by having a flat, substantially rectangular shape.

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