JP4188171B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchange apparatus that heats an object to be heated in a heat exchanger using steam as a heat source.

  The heat exchange device connects the steam supply pipe and the fluid discharge pipe to the heat exchanger, and connects the ejector device to the fluid discharge pipe, so that a part of the condensate in which the steam is condensed by heat exchange in the heat exchanger. The remaining steam is sucked by the ejector device.

In this heat exchange device, since the ejector device sucks condensate together with steam, the ejector efficiency, that is, the ejector efficiency is smaller as the drive steam amount for driving the ejector with respect to the suction fluid amount that the ejector can suck is smaller. However, there is a problem that it becomes extremely high.
JP-A-2-213601

  The problem to be solved is to provide a heat exchange device that can prevent the ejector device from sucking condensate and maintain high ejector efficiency.

In the present invention, a steam supply pipe and a fluid discharge pipe are connected to a heat exchanger, and heat exchange is performed with steam supplied from the steam supply pipe. In the case of sucking with an ejector device through a fluid discharge pipe, a gas-liquid separator that separates gas and liquid is disposed between the heat exchanger and the ejector device, and the inlet of the suction portion of the ejector device is connected to the steam supply pipe. Is connected to the branched steam pipe, and the diffuser portion of the ejector device is connected again to the steam supply pipe by the communication pipe .

  In the heat exchange device of the present invention, a gas-liquid separator that separates gas and liquid is disposed between the heat exchanger and the ejector device, so that the fluid flowing from the heat exchanger to the ejector device can be condensed into a condensate as a liquid. Therefore, there is an advantage that the ejector efficiency can be increased.

  In the present invention, a gas-liquid separator that separates a gas and a liquid is disposed between a heat exchanger and an ejector device. As the gas-liquid separator, the mass of the gas and the liquid is swirled by centrifugal force. Separating gas and liquid by size, separating gas and liquid by passing a fluid through a porous mesh member, or separating gas and liquid by colliding a gas-liquid mixed fluid against a collision plate, etc. Conventionally used ones can be used.

  FIG. 1 is a block diagram of an embodiment of the present invention, and includes a heat exchanger 1, a steam supply pipe 2, a fluid discharge pipe 3, an ejector device 4, and gas-liquid separators 5 and 6. Configure.

  A steam supply pipe 2 that supplies steam for heating to the heat exchanger 1 is connected to an inlet 9 of the heat exchanger 1 via a control valve 7 and an on-off valve 8 for controlling the amount of steam supplied. .

  The heat exchanger 1 includes a plurality of rotating disks 10 and 11 that rotate at an arbitrary rotation speed around the central axes of the inlet 9 and the outlet 12, and a cover 13 that airtightly covers the outer periphery of the rotating disks 10 and 11. Consists of. An exhaust fan (not shown) is connected to the outside of the cover 13. The steam supplied from the steam supply pipe 2 into the rotating disks 10 and 11 heats the heat exchange object, that is, the object to be heated, adhering to the outer periphery of the rotating disks 10 and 11, and is heated. The object is taken out from the lower end opening (not shown) of the cover 13, the vapor evaporated by the heating of the heated object is removed from the exhaust fan, and the condensed water that has been deprived of heat by the heated object is rotated. It flows down from the outlet 12 in the disks 10 and 11 into the fluid discharge pipe 3.

  A steam trap 15 having a function of discharging only condensate without discharging steam is connected to the fluid discharge pipe 3 through an on-off valve 14. A condensate discharge pipe 16 is connected to the outlet of the steam trap 15.

  A part of the fluid discharge pipe 3 is branched, and the communication pipe 17 is communicated with the suction section 18 of the ejector device 4. An open / close valve 19, the first gas-liquid separator 5, and the second gas-liquid separator 6 are disposed in the communication pipe 17. Steam traps 20 and 21 are connected below the gas-liquid separators 5 and 6 to communicate with the condensate discharge pipe 16.

Part of the condensate / steam mixed fluid flowing down the fluid discharge pipe 3 reaches the steam trap 15 from the on-off valve 14 and only the condensate is discharged to the discharge pipe 16, and the remainder of the mixed fluid is gas-liquid from the communication pipe 17. The gas and liquid are separated while flowing down the separators 5 and 6, and the separated condensate is discharged from the steam traps 20 and 21 to the discharge pipe 16, and only the separated steam of the condensate is discharged from the ejector device 4. Suctioned to the suction unit 18.

  The ejector device 4 includes a suction part 18 and a diffuser part 22. The inlet of the suction part 18 is connected to a branch steam pipe 23 branched from the steam supply pipe 2, and the diffuser part 22 is connected to the steam supply pipe 2 by a communication pipe 24. Connect again. The branch steam pipe 23 is provided with an open / close valve 25 and a control valve 26, and the communication pipe 24 is provided with a control valve 27.

  When the driving steam is supplied from the branch steam pipe 23 to the ejector device 4, a suction force is generated in the suction portion 18 to suck the steam in the communication pipe 17. The sucked steam and the driving steam are mixed, reach the steam supply pipe 2 from the control valve 27 and the communication pipe 24, and are supplied to the inlet 9 of the heat exchanger 1.

  The ejector device 4 can maintain a high ejector efficiency by sucking only the vapor separated and removed from the condensate by the gas-liquid separators 5 and 6.

  In the above-described embodiment, an example in which a plurality of rotating disks 10 and 11 are used as the heat exchanger 1 has been described. However, as long as the ejector device 4 is connected, the same applies to other heat exchangers. Can be used.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Steam supply pipe 3 Fluid discharge pipe 4 Ejector apparatus 5, 6 Gas-liquid separator 9 Inlet 10, 11 Rotating disc 12 Outlet 15 Steam trap 17 Communication pipe 18 Suction part 22 Diffuser part 23 Branch steam pipe 24 Communication Pipe 27 Control valve

Claims (1)

A steam supply pipe and a fluid discharge pipe are connected to the heat exchanger, and heat is exchanged with the steam supplied from the steam supply pipe, and the condensate condensed by the heat exchange and a part of the steam are connected to the fluid discharge pipe. A gas-liquid separator that separates gas and liquid between the heat exchanger and the ejector device, and the inlet of the ejector device is branched from the steam supply pipe. A heat exchange device characterized in that it is connected to a steam pipe and the diffuser part of the ejector device is connected again to the steam supply pipe by a communication pipe .

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