JP2013170707A - Condensate recovery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a condensate recovery device capable of securely exhausting a condensation to the outside, even if a steam pressure used by steam-using equipment drops.SOLUTION: A steam supply pipe 7 supplying steam for heating is connected to steam-using equipment 1. An outlet of a steam trap 2 mounted on an outlet side of the steam-using equipment 1 is connected to a suction chamber 4 of an ejector 3. A driving fluid supply pipe 5 is connected to a nozzle part of the ejector 3. A differential pressure regulating valve 6 is disposed in a driving fluid supply pipe 5. Then, a primary pressure detection duct line 8 of the differential pressure regulating valve 6 is connected to the steam supply pipe 7, and a secondary pressure detection duct line 10 is connected to an outlet side of the steam trap 2. When a pressure of steam supplied by the steam supply pipe 7 drops, the differential pressure regulating valve 6 opens to supply high pressure steam to the ejector 3. After that, a condensation staying in the steam-using equipment 1 is sucked and returned to a prescribed place.

Description

The present invention relates to a condensate recovery apparatus that recovers condensate as condensate of steam generated in a steam-using device to a predetermined condensate recovery destination such as a boiler, a water supply tank, and a discharge port.

 A conventional condensate recovery apparatus connects a condensate outlet side of a steam-using device to a condensate pumping member via a steam trap and a condensate collecting tank, and a pressure control valve is connected to a high-pressure operation fluid discharge port of the condensate pumping member. It is possible to reduce heat energy loss.

  In this condensate recovery apparatus, there is a problem that if the steam pressure used in the steam-using device is low, the condensate generated in the steam-using device cannot be discharged reliably. This is because the pressure control valve attached to the high-pressure operating fluid discharge port of the condensate pumping member cannot bring the inside of the condensate pumping member into a vacuum state below atmospheric pressure, and the steam pressure used in steam-using equipment When the temperature becomes extremely low, the condensate of the steam-using device cannot be discharged outside through the steam trap.

JP 2008-170126 A

  The problem to be solved is that the outlet of the steam trap can be set to a vacuum state below atmospheric pressure, so that the condensate can be reliably discharged to the outside even if the steam pressure used in the steam-using equipment becomes extremely low. To provide a condensate recovery device that can be discharged.

The present invention collects condensate generated in steam-using equipment to a predetermined condensate collection destination, and connects a steam trap to the outlet side of the steam-using equipment and connects the outlet of the steam trap to the suction chamber of the ejector. Connect, connect the nozzle part of the ejector to the driving fluid supply pipe, place a differential pressure valve in the driving fluid supply pipe, and connect the end of the primary pressure detection pipe line of the differential pressure valve to the inside of the steam-using device. Or, it is connected to the steam supply pipe that supplies steam to the equipment that uses steam, and the end of the secondary pressure detection pipe of the differential pressure valve is connected between the outlet side of the steam trap and the suction chamber of the ejector. is there.

  In the condensate recovery apparatus of the present invention, the outlet of the steam trap is connected to the suction chamber of the ejector, a differential pressure valve is arranged in the drive fluid supply pipe to the ejector, and the end of the primary pressure detection pipe line of the differential pressure valve is connected , Connected to the inside of the steam-using equipment or to the steam supply pipe for supplying steam to the steam-using equipment, and connected the end of the secondary pressure detection pipe of the differential pressure valve to the outlet side of the steam trap and the suction chamber of the ejector When the steam pressure inside the steam using device or the steam pressure in the steam supply pipe drops to a predetermined value, the differential pressure valve opens and the drive fluid is supplied from the drive fluid supply pipe to the ejector. For example, by supplying high-pressure steam or high-pressure water and generating a suction force in the suction chamber of the ejector, the outlet of the steam trap can be brought into a vacuum state below atmospheric pressure.

The block diagram which shows the Example of the condensate collection | recovery apparatus of this invention.

  The condensate recovery apparatus of the present invention uses an ejector. As this ejector, a conventionally known ejector such as a steam ejector that uses high-pressure steam as a driving fluid or a water ejector that uses high-pressure water as a driving fluid is used. Can do.

FIG. 1 is a block diagram of an embodiment of the present invention, in which a steam-using device 1, a steam trap 2 connected to the outlet side of the steam-using device 1, and a suction chamber of an ejector 3 connected to the outlet of the steam trap 2 are shown. 4, the driving fluid supply pipe 5 connected to the nozzle portion of the ejector 3, and the differential pressure valve 6 disposed in the driving fluid supply pipe 5 constitute a condensate recovery device.

A steam supply pipe 7 is connected to the steam using device 1. The steam supply pipe 7 is formed in a spiral shape inside the steam using device 1, and the steam trap 2 is connected to an outlet end portion thereof. The steam trap 2 causes only the condensate condensed with the steam deprived of heat in the spiral part inside the steam-using device 1 to flow down to the suction chamber 4 side of the ejector 3 and does not flow down the steam. is there.

A drive fluid supply pipe 5 is connected to the ejector 3 via a differential pressure valve 6. In the present embodiment, an example in which high-pressure steam is used as a driving fluid is shown. The differential pressure valve 6 automatically opens and closes according to the differential pressure between the primary pressure and the secondary pressure, and the primary pressure detection pipe line 8 is connected to the steam supply pipe 7 to connect the secondary pressure detection pipe. The end of the passage 10 is connected between the outlet side of the steam trap 2 and the suction chamber 4 of the ejector 3. When the steam is directly heated by the steam using device 1, the primary pressure detection pipe line 8 is connected to the inside of the steam using device 1. Connected to the lower outlet side of the ejector 3 is a condensate recovery pipe 9 for recovering the condensate generated in the steam using device 1 to a predetermined condensate recovery destination.

By supplying high-pressure steam for heating from the steam supply pipe 7 to the steam using device 1, an object to be heated (not shown) in the steam using device 1 is steam heated. Steam deprived of heat by heating is condensed into condensate, and flows down from the condensate recovery pipe 9 to a predetermined condensate recovery destination via the steam trap 2 and the ejector 3. Thus, when the pressure of the steam supplied from the steam supply pipe 7 is high, the differential pressure valve 6 is closed, and the ejector 3 does not need to be driven by the drive fluid from the drive fluid supply pipe 5, so Water is recovered.

On the other hand, when the pressure of the steam supplied from the steam supply pipe 7 is low, for example, when the supply steam pressure is in a vacuum state of about atmospheric pressure or less than atmospheric pressure, the condensate generated in the steam-using device 1 has a pressure difference. Therefore, the steam trap 2 is not discharged and stays in the steam using device 1.

The primary pressure detection line 8 and the secondary pressure detection line 10 of the differential pressure valve 6 indicate that the pressure of the steam supplied from the steam supply pipe 7 is low and the pressure on the outlet side of the steam trap 2 is high. When the differential pressure valve 6 detects the pressure, the differential pressure valve 6 automatically opens, supplies high pressure steam from the drive fluid supply pipe 5 to the ejector 3, and generates a suction force in the suction chamber 4. The condensed water staying in the steam using device 1 can be sucked through the trap 2 and the condensed water can be recovered from the condensed water recovery pipe 9 to a predetermined location.

  INDUSTRIAL APPLICABILITY The present invention can be used as a condensate recovery apparatus that can reliably recover condensate even when the pressure of steam used in steam-using equipment is low.

DESCRIPTION OF SYMBOLS 1 Steam use equipment 2 Steam trap 3 Ejector 4 Suction chamber 5 Drive fluid supply pipe 6 Differential pressure valve 7 Steam supply pipe 8 Primary pressure detection pipe 9 Condensate recovery pipe 10 Secondary pressure detection pipe

Claims (1)

When recovering condensate generated from steam-using equipment to the specified condensate collection destination, connect a steam trap to the outlet side of the steam-using equipment, connect the outlet of the steam trap to the suction chamber of the ejector, and The nozzle part of the ejector is connected to the driving fluid supply pipe, a differential pressure valve is arranged in the driving fluid supply pipe, and the end of the primary pressure detection pipe line of the differential pressure valve is connected to the inside of the steam using device or the steam It is connected to the steam supply pipe that supplies steam to the equipment used, and the end of the secondary pressure detection pipe of the differential pressure valve is connected between the outlet side of the steam trap and the suction chamber of the ejector. Water recovery device.

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