JP5443714B2 - Waste steam recovery device - Google Patents

Description

  The present invention can eliminate waste steam that can be trapped in the inside or outside of a factory building by collecting waste steam that is discarded from various steam-using devices such as shrink tunnels, steamers, and rubber vulcanizers. The present invention relates to a waste steam recovery device.

  The waste steam recovery unit is a shrink tunnel that uses steam, and vacuum suction means that consists of an ejector, a liquid tank, and a circulation pump connected by a waste steam recovery pipe. By sucking with the sucking means, it is possible to eliminate waste steam that can get trapped.

In this waste steam recovery apparatus, there is a problem that it is impossible to reliably suck all the waste steam generated instantaneously and in large quantities. Also, in order to reliably suck the waste steam generated instantaneously and in large quantities, the capacity of the circulation pump that constitutes the vacuum suction means must be increased, which increases the cost of the apparatus itself and increases the circulation. Since a lot of electric power is required for driving the pump, there is a problem that the running cost increases.
Japanese Patent Laid-Open No. 2002-5582

  The problem to be solved is to provide an inexpensive waste steam recovery apparatus capable of reliably sucking waste steam generated instantaneously and in large quantities.

The present invention discharges waste steam flowing down from a steam device to a predetermined location, and communicates a vacuum tank maintained in a predetermined vacuum pressure state with a waste steam passage through which the waste steam flows, so that the vacuum tank The suction port of the steam ejector is connected to the lower part of the steam ejector via a steam / condensate tank, and at least two steam ejectors are arranged to flow to the inlet side of the suction port of the steam ejector or the outlet side of the diffuser of the steam ejector. A road switching valve is attached, and the connection position of at least two steam ejectors is switched to a parallel state or a serial state by switching operation of the switching valve.

  The waste steam recovery device of the present invention reliably sucks all of the waste steam in this vacuum tank when waste steam is generated instantaneously and in large quantities by communicating with a vacuum tank maintained at a predetermined pressure state. It is possible to prevent some waste steam from rising.

  The present invention uses a vacuum tank maintained at a predetermined pressure state. The pressure state and volume of the vacuum tank depend on the amount of waste steam generated or the amount of waste steam generated per unit time. Can be selected as appropriate.

  In this embodiment, as shown in FIG. 1, the waste steam passage 1, the vacuum tank 2 connected to the waste steam passage 1, and the two steam ejectors 4 and 15 constitute a waste steam recovery device.

  A conical waste steam collection port 3 is provided at the left end of the waste steam passage 1. A steam device (not shown) is disposed below the waste steam collection port 3. Waste steam generated in the steam device is sucked from the waste steam collection port 3.

  A vacuum tank 2 is disposed in the middle of the waste steam passage 1 with a valve 8 interposed. The vacuum tank 2 has a hollow cylindrical shape, and the lower end of the waste steam passage 1 is connected to the upper part. On the other hand, the lower part of the vacuum tank 2 communicates with the suction port 10 of the steam ejector 4 through the communication pipe 5, the steam / condensate tank 6, and the connection pipe 7.

 The steam ejector 4 is composed of a suction port 10 and a diffuser unit 11, and a high-pressure steam pipe 12 that supplies high-pressure steam for driving the ejector is connected to the suction port 10 side, and an intermediate-pressure steam is connected to the outlet side of the diffuser unit 11. The pipe 13 is connected to communicate with a separate medium pressure steam use location (not shown).

  The high-pressure steam pipe 12 communicates with the suction port 16 side of the steam ejector 15, and the suction port 16 of the steam ejector 15 and the branch connection pipe 17 branched from the connection pipe 7 are connected. A three-way switching valve 18 is interposed in the branch connection pipe 17. A check valve 20 is attached to the outlet pipe 19 of the steam ejector 15. The check valve 20 allows only the flow of steam from the steam ejector 15 toward the intermediate pressure steam pipe 13 and prevents the flow in the opposite direction.

  The outlet side of the lower steam ejector 4 is connected to the intermediate pressure steam pipe 13 via a two-way switching valve 21.

 The steam / condensate tank 6 connected to the steam ejectors 4 and 15 via the connection pipe 7 is in the shape of a horizontally long pipe, and the connection pipe 7 and the communication pipe 5 are connected to the upper part. At the lower part of the steam / condensate tank 6, a steam trap 14 for discharging only condensate condensed with steam to the outside is attached.

 Waste steam that has flowed down from the vacuum tank 2 into the steam / condensate tank 6 is sucked into the suction ports 10 and 16 of the steam ejectors 4 and 15 and mixed with high-pressure steam to be separately used from the intermediate pressure steam pipe 13. In addition, a part of the steam / condensate tank 6 is deprived of heat, condenses and becomes condensate, and is discharged from the steam trap 14 to the outside.

  When there is a lot of waste steam sucked from the connection pipe 7 of the steam ejectors 4 and 15, the two-way switching valve 21 is opened and the three-way switching valve 18 is operated to connect the connection pipe 7, the branch connection pipe 17, and the suction port. By connecting 16, the connection positions of the two steam ejectors 4, 15 are in a parallel state, and a large amount of waste steam can be sucked through the connection pipe 7 by both steam ejectors 4, 15.

  When the amount of waste steam sucked from the connecting pipe 7 is small, the two-way switching valve 21 is closed and the three-way switching valve 18 is operated, so that the outlet side of the steam ejector 4 and the suction port of the upper steam ejector 15 are operated. 16, the connection positions of the two steam ejectors 4 and 15 are in series, and the steam sucked from the connection pipe 7 into the suction port 10 of the steam ejector 4 passes through the three-way switching valve 18 to the upper steam. It is sucked into the suction port 16 of the ejector 15 and flows down to the intermediate pressure steam pipe 13.

 By supplying high-pressure steam for driving from the high-pressure steam pipe 12 to the steam ejectors 4 and 15, a predetermined vacuum suction force is generated at the respective suction ports 10 and 16, whereby a predetermined pressure state is generated in the vacuum tank 2 Can be maintained. When a large amount of waste steam is instantaneously generated below the waste steam collection port 3, the valve 8 of the waste steam passage 1 is fully opened, so that the large amount of waste steam is in a predetermined pressure state, that is, below atmospheric pressure. All of the waste steam is quickly sucked into the vacuum tank 2 maintained in the vacuum pressure state.

  As described above, by disposing the vacuum tank 2 in the waste steam passage 1, the present invention can eliminate the waste steam rising up.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste steam passage 2 Vacuum tank 3 Waste steam collection port 4 Steam ejector 6 Steam and condensate tank 7 Connection pipe 10 Suction port 11 Diffuser part 12 High pressure steam pipe 13 Medium pressure steam pipe 14 Steam trap 15 Steam ejector 16 Suction port 17 Branch Connecting pipe 18 Three-way switching valve 20 Check valve 21 Two-way switching valve

Claims (1)

In what discharges the waste steam flowing down from the steam device to a predetermined place,
A vacuum tank maintained in a predetermined vacuum pressure state is communicated with a waste steam passage through which waste steam sucked from the waste steam collection port flows,
A suction port of a steam ejector driven by high-pressure steam supplied from a high-pressure steam pipe is connected to the lower part of the vacuum tank via a steam / condensate tank having a steam trap for discharging the condensed water of the waste steam to the outside. And
Arrange at least two steam ejectors,
Install the switching valve of the flow path on the outlet side of the diffuser at the inlet side or the steam ejector suction port of the steam ejector,
A waste steam recovery apparatus, wherein the connection position of at least two steam ejectors is switched to a parallel state or a serial state by switching operation of the switching valve.

Images