JP2007051800A - Condensate recovery device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a condensate recovery device simple in structure and low in cost regarding the condensate recovery device for recovering condensate which is the condensed water of steam generated in steam use equipment or the like. <P>SOLUTION: An ejector 1 is connected to the lower part of the steam use equipment 7 through a steam trap 10 and a header 11. A bursting passage 5 is connected to the header 11 to connect the header 11 to a suction port 22 of a steam ejector 20. The inlet side of the steam ejector 20 is connected to a branch steam pipe 21 branched from a steam supply pipe 8, and the outlet side is connected to a second ejector 6. The condensate discharged from the steam tap 10 is once stored in the header 11 and sucked by the ejector 1. A part of the condensate in the header 11 becomes re-evaporated steam and is sucked by the steam ejector 20, further sucked by the second ejector 6 and recovered to a condensate recovery place from a duct 14. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a condensate recovery device that recovers condensate as condensate of steam generated in a steam-using device or the like to a boiler or the like. Condensate generated in steam-using equipment is generally discharged to the outside through a steam trap, but the discharged condensate is high-temperature and high-pressure steam condensate and still has a lot of high-temperature heat energy. In order to make effective use of this thermal energy, recovery of condensate has been conventionally performed.

A conventional condensate recovery apparatus includes a circulation pump connected to an electric motor, a sealed circulation passage connecting a discharge port and a suction port of the circulation pump, and an ejector member disposed in the middle of the circulation passage. Thus, by circulating a part of the condensate in the circulation passage and the ejector member, the condensate discharged from the steam trap can be sucked and pumped to a predetermined recovery destination.

In the conventional condensate recovery device, since a separate combination pump including an ejector, a tank, and an electric pump is disposed in the discharge passage, the structure of the device is complicated and the cost of the device increases. was there.
Japanese Patent No. 2630882

  The problem to be solved is to obtain an inexpensive condensate recovery device with a simple structure.

  The present invention recovers condensate generated in steam-using equipment to a condensate recovery destination such as a boiler or a water supply tank by a condensate recovery pump via a condensate recovery pipe. An ejector is provided in the condensate recovery pipe. The suction port of the ejector is connected to the inlet side of the condensate recovery pump via a steam ejector.

  In the present invention, when an ejector is attached to the condensate recovery pipe, and the suction port of the ejector is connected to the inlet side of the condensate recovery pump via the steam ejector, the excessive pressure is released from the pressure release passage. After sucking with a steam ejector, it can be sucked and released with just the ejector attached to the condensate recovery pipe, and there is no need to provide a separate electric pump or tank as in the prior art, and the structure is simple and inexpensive. A condensate recovery device can be provided.

  As the ejector and the steam ejector, those conventionally used can be used, and an ejector composed of a nozzle, a suction chamber provided with a suction port, and a diffuser portion can be used.

  In FIG. 1, a pressure release passage 5 communicating with a steam-using device 7, a combination pump 3 constituted by an ejector 1 and a circulation pump 2, a condensate recovery pipe 4 connected to the combination pump 3, and a condensate recovery pipe 4 The second ejector 6 and the steam ejector 20 that are attached to the water vapor constitute a condensate recovery device.

  A steam supply pipe 8 for supplying steam to the steam using device 7 is connected. A control valve 9 for controlling the supply amount of steam is attached to the steam supply pipe 8. A steam trap 10 is attached to the lower part of the steam using device 7. The steam trap 10 has a function of discharging only condensate in the mixed fluid of steam and condensate from the lower outlet to the outside, but does not discharge steam from the outlet to the outside.

  Between the steam trap 10 and the ejector 1, a header 11 for temporarily collecting the condensate discharged from the steam trap 10 is disposed. The steam trap 10 is connected to the left side surface of the header 11, the ejector 1 is connected to the lower end surface, and the pressure relief passage 5 is connected to the upper end surface. A steam ejector 20 connected to a branch steam pipe 21 branched from the steam supply pipe 8 and a pressure control valve 12 capable of setting a steam pressure to be released are attached to the pressure release passage 5. The end of the pressure relief passage 5 is connected to the suction port 22 of the steam ejector 20, and the outlet side of the steam ejector 20 is connected to the suction port 15 of the second ejector 6 by a pipe line 23.

  The combination pump 3 is configured by connecting the ejector 1 and the circulation pump 2 through a circulation path 13. A part of the circulation path 13 is branched to connect the condensate recovery pipe 4. A second ejector 6 is attached to the condensate recovery pipe 4. The outlet side conduit 14 of the ejector 6 communicates with a condensate collection destination such as a boiler (not shown).

The suction port 15 of the ejector 6 and the inlet side of the combination pump 3, that is, the pressure release passage 5 are connected by a steam ejector 20 and a pipe line 23. A valve 24 and a check valve 17 are attached to the conduit 23. The check valve 17 has a function of allowing passage of fluid from the steam ejector 20 to the ejector 6 but blocking passage of fluid in the opposite direction.

The steam supplied from the steam supply pipe 8 to the steam using device 7 is condensed by being deprived of heat, and is sucked into the ejector 1 through the steam trap 10 and the header 11. Further, the condensate discharged from the steam trap 10 is stored in the header 11, so that part of the condensate is evaporated again to become re-evaporated steam, which is sucked into the steam ejector 20, and further the second ejector. 6 and is pumped from the outlet side conduit 14 to the condensate recovery destination.

  The re-evaporated steam on the outlet side of the steam trap 10 is sucked by the steam ejector 20 and the second ejector 6 and recovered to the condensate recovery destination, so that the heat energy can be effectively used and the outlet of the steam trap 10 The side pressure can be maintained below a predetermined value, and the condensate does not stay in the steam trap 10.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ejector 2 Circulation pump 3 Combination pump 4 Condensate recovery pipe 5 Relief passage 6 Ejector 8 Steam supply pipe 10 Steam trap 11 Header 13 Circulation path 14 Outlet side pipe 20 Steam ejector 23 Pipe

Claims (1)

Condensate generated in steam-using equipment is collected by a condensate recovery pump to a condensate recovery destination such as a boiler or a water supply tank via a condensate recovery pipe. An ejector is attached to the condensate recovery pipe. The condensate recovery apparatus is characterized in that the suction port is connected to the inlet side of the condensate recovery pump via a steam ejector.

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