JP2010043794A - Condensate recovering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a condensate recovering device having a low heat energy loss by preventing the generation of reevaporated steam to be discharged to the atmospheric air. <P>SOLUTION: A waste steam heat exchanger 3 is disposed at a lower part of a plurality of steam use devices 1, 2. A coiled heat exchange pipe 29 is disposed inside the waste steam heat exchanger 3. An end section of the heat exchange pipe 29 is applied as a cooling water supply pipe 30. A condensate pressure-feeding means 4 is disposed at a lower part of the waste steam heat exchanger 3 through a condensate pipe 11. The condensate generated in the steam using devices 1, 2 flows down to the waste steam heat exchanger 3 through steam traps 6, 7. As the reevaporated steam in the waste steam heat exchanger 3 is cooled by the heat exchange pipe 29 to be condensed again, the volume is reduced, and the inside of the waste steam heat exchanger 3 is kept in a decompressed state of low pressure. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a condensate recovery device that recovers condensate as condensed water of steam generated in a plurality of steam-using devices 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 thermal energy. In order to effectively use this heat energy, recovery of condensate has been conventionally performed.

  In the condensate recovery apparatus, a pressure release passage 7 is provided between the steam trap 4 attached to the outlet side of the plurality of steam using devices 3 and the condensate pump means 5, and the pressure difference is adjusted to the pressure release passage 7. By attaching the valve 21, the pressure difference between the inlet side and the outlet side of the steam trap 4 is always maintained as much as necessary, and the condensate can be discharged reliably.

In this condensate recovery apparatus, the condensate can be discharged from the steam trap 4 based on the set pressure of the differential pressure regulating valve 21 in the discharge passage 7 with the lowest steam pressure among the plurality of steam-using devices as a reference. The pressure must be set, the value of the set pressure becomes low, a large amount of re-evaporated vapor is released from the pressure release passage 7 into the atmosphere, and the loss of heat energy becomes large. There was a problem.
Japanese Examined Patent Publication No. 61-18038

  The problem to be solved is to eliminate the re-evaporated steam released from the pressure release passage into the atmosphere, and to obtain a condensate recovery device with little heat energy loss.

  The present invention recovers condensate generated by a plurality of steam-using devices to a condensate recovery destination such as a boiler or a water supply tank using a condensate recovery pump. Condensate pumping means is connected to collect the condensate collected in the waste steam heat exchanger and pump the condensate collected in the waste steam heat exchanger to a predetermined location.

  In the condensate recovery apparatus of the present invention, the condensate generated by a plurality of steam-using devices is collected in one waste steam heat exchanger, and the condensate and re-evaporated steam are cooled to re-evaporate into the atmosphere. It is not necessary to release the steam, and thermal energy loss can be minimized.

  In the present invention, a waste steam heat exchanger is attached. In this waste steam heat exchanger, a coiled heat exchange pipe is disposed in the heat exchanger, and cooling water is supplied to the heat exchange pipe. Therefore, it is preferable to cool the high-temperature condensate in the heat exchanger and the re-evaporated steam re-evaporated from the condensate.

  In FIG. 1, a condensate recovery apparatus is composed of a plurality of steam using devices 1, 2, one waste steam heat exchanger 3 positioned below these steam using devices 1, and condensate pumping means 4. Constitute.

  A steam supply pipe 5 that supplies high-pressure and high-temperature steam is connected to the plurality of steam-using devices 1 and 2. Below the steam using devices 1 and 2, steam traps 6 and 7 for discharging only condensate generated by condensing steam in the steam using devices 1 and 2 are attached. The lower ends of the steam traps 6 and 7 are connected to the waste steam heat exchanger 3.

  The waste steam heat exchanger 3 is formed of a cylindrical container, and a cylindrical pipe 8 having a diameter smaller than that of the waste steam heat exchanger 3 is attached to the center portion with a gap 9 provided at the lower end. A liquid discharge pipe 10 having a smaller diameter than that of the cylindrical pipe 8 is attached to the lower part of the cylindrical pipe 8. The liquid discharge pipe 10 is connected to the condensate inlet 12 of the liquid pumping member 4 by a condensate pipe 11.

  The liquid discharge pipe 10 is attached so that the upper end of the liquid discharge pipe 10 is positioned above the lower end of the cylindrical pipe 8 by a predetermined length. A liquid reservoir 26 is formed by the outer periphery of the liquid discharge pipe 10, the inner and outer periphery of the cylindrical pipe 8, and the lower inner periphery of the waste steam heat exchanger 3. A valve 27 and a conduit 28 are attached to the upper end of the cylindrical pipe 8, and the valve 27 is opened so that it can communicate with the atmosphere.

  A heat exchange pipe 29 is attached above the interior of the waste steam heat exchanger 3. The heat exchange pipe 29 is formed by spirally surrounding the outer circumference of the cylindrical pipe 8, and is supplied with cooling water from the cooling fluid supply pipe 30 to cool the re-evaporated steam in the waste steam heat exchanger 3 to condensate. To do.

  A spare steam supply pipe 22 for supplying spare steam is connected to the upper part of the waste steam heat exchanger 3. Steam is supplied from the preliminary steam supply pipe 22 into the waste steam heat exchanger 3, cooled by the heat exchange pipe 29, and condensed. As a result, the volume of the steam is rapidly reduced, and the waste steam heat exchanger is reduced. 3 is in a depressurized state below atmospheric pressure, and the condensate generated in the steam using devices 1 and 2 is sucked into the waste steam heat exchanger 3 through the steam traps 6 and 7.

  A condensate pipe 11 is attached to the lower part of the waste steam heat exchanger 3 and connected to a condensate inlet 12 of a condensate pressure feeding member 4 as a condensate pressure feeding means. A check valve 14 is attached to the condensate pipe 11. This check valve 14 allows the condensate to pass from the waste steam heat exchanger 3 to the condensate pressure feeding member 4 and does not allow the condensate to pass in the reverse direction.

 A condensate pressure feed line 17 is also connected to the condensate pressure feed port 15 of the condensate pressure feed member 4 via a check valve 16. This check valve 16 allows the condensate to pass only from the condensate pumping member 4 to the condensate pumping line 17 side.

 A high-pressure steam inlet 19 connected to a high-pressure steam supply pipe 18 as a pressure-feeding fluid is provided on the top of the condensate pressure-feeding member 4. A high-pressure steam outlet 20 is provided on the right side of the high-pressure steam inlet 19. A high-pressure steam discharge pipe 21 is connected to the discharge port 20.

 The condensate pressure-feeding member 4 has a high-pressure steam inlet 19 closed and a discharge outlet 20 opened when a float (not shown) disposed therein is located in the lower part. The condensate flows down into the condensate pressure feeding member 4 through the condensate pipe 11 and the check valve 14.

  When condensate accumulates in the condensate pumping member 4 and a float (not shown) is positioned at a predetermined upper portion, the discharge port 20 is closed, while the high-pressure steam inlet 19 is opened and the high-pressure steam supply pipe 18 is opened. High-pressure steam flows into the condensate pressure-feeding member 4, and the condensate accumulated inside is pumped to the condensate pressure-feed destination via the pressure-feed port 15, the check valve 16 and the condensate pressure-feed line 17.

  When the condensate is pumped and the liquid level in the condensate pumping member 4 is lowered, the high pressure steam inlet 19 is closed again and the outlet 20 is opened, so that the condensate is pumped from the condensate inlet 12. It flows down into the member 4. By repeating such an operation cycle, the condensate pumping member 4 pumps the condensate in the waste steam heat exchanger 3.

The steam supplied from the steam supply pipe 5 to the steam using devices 1 and 2 becomes condensed water by working and condensing in the steam using devices 1 and 2, and from the steam traps 6 and 7, the waste steam heat exchanger 3. It flows down into. In the waste steam heat exchanger 3, a part of the condensate is evaporated again to become re-evaporated steam and accumulate in the interior. The re-evaporated steam and a part of the condensate are cooled by the heat exchange pipe 29, so that the re-evaporated steam becomes the condensate again, and the volume rapidly decreases. Low decompression state.

  When the inside of the waste steam heat exchanger 3 is in a reduced pressure state, the condensate generated in the steam using devices 1 and 2 quickly flows into the waste steam heat exchanger 3 through the steam traps 6 and 7. Can do.

Since the reevaporated steam is not released from the waste steam heat exchanger 3 into the atmosphere, the loss of heat energy can be extremely reduced.

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

Explanation of symbols

1, 2 Steam use equipment 3 Waste steam heat exchanger 4 Condensate pressure feeding means 5 Steam supply pipe 6, 7 Steam trap 8 Cylindrical pipe 10 Liquid discharge pipe 11 Condensate pipe 12 Condensate inlet 15 Condensate feed port 19 High pressure steam introduction Port 20 High-pressure steam outlet 29 Heat exchange pipe

Claims (1)

Condensate generated by multiple steam-using devices is recovered by a condensate recovery pump to a condensate recovery destination such as a boiler or a water supply tank. A condensate recovery device characterized by being connected to a condenser and connected to a condensate pumping means for pumping the condensate accumulated in the waste steam heat exchanger to a predetermined location.

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