JP5335316B2 - Condensate recovery device - Google Patents

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 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. A condensate tank cooling means that cools the condensate tank is assembled in a horizontally long condensate tank, and the condensate tank cooling means is attached to the inside of the condensate tank. In the condensate tank, the re-evaporated steam and a part of the condensate are cooled by the heat exchange pipe. the which are connected to Rutotomoni low vacuum condition where the pressure, the condensate water pressure feeding means for pumping condensate collected in the condensate tank to predetermined positions.

  In the condensate recovery apparatus of the present invention, condensate generated by a plurality of steam-using devices is collected in a single condensate tank, and the condensate and re-evaporated steam are cooled by the condensate tank cooling means, thereby There is no need to release the reevaporated vapor into the interior, and thermal energy loss can be minimized.

  The present invention is provided with a condensate tank cooling means for cooling the condensate tank. The condensate tank cooling means is provided with a coiled heat exchange pipe disposed in the condensate tank, and the heat exchange pipe. It is preferable to cool the high-temperature condensate in the condensate tank and the reevaporated vapor re-evaporated from the condensate by supplying cooling water to the condensate.

  In FIG. 1, a plurality of steam using devices 1 and 2, a single condensate tank 3 positioned below these steam using devices 1 and 2, and a condensate pumping means 4 constitute a condensate recovery apparatus. .

  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 condensate tank 3.

  The condensate tank 3 has a horizontally long cylindrical shape, and a coiled heat exchange pipe 8 is attached inside. Both ends of the heat exchange pipe 8 are a cooling water supply pipe 9 and a cooling water discharge pipe 10 whose temperature has been increased by heat exchange.

  A condensate pipe 11 is attached to the lower part of the condensate tank 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. The check valve 14 allows the condensate to pass from the condensate tank 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 and communicates with an upper side portion of the condensate tank 3.

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

  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 pressure feeding member 4 pressure-feeds the condensate in the condensate tank 3.

The steam supplied from the steam supply pipe 5 to the steam using devices 1 and 2 becomes condensed water by working in the steam using devices 1 and 2 and condensing, and from the steam traps 6 and 7 into the condensate tank 3. And flow down. In the condensate tank 3, a part of the condensate is evaporated again to become re-evaporated steam and accumulates in the upper part of the condensate tank 3. The re-evaporated steam and a part of the condensate are cooled by the heat exchange pipe 8, so that the re-evaporated steam becomes the condensate again, and the volume is rapidly reduced. It becomes a state.

  By reducing the pressure in the condensate tank 3, the condensate generated in the steam using devices 1 and 2 can quickly flow down into the condensate tank 3 through the steam traps 6 and 7.

Since the re-evaporated steam is not released from the condensate tank 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 Condensate tank 4 Condensate pressure feeding means 5 Steam supply pipes 6 and 7 Steam trap 8 Heat exchange pipe 9 Cooling water supply pipe 11 Condensate pipe 12 Condensate inlet 15 Condensate feed port 19 High pressure steam introduction Port 20 High-pressure steam outlet

Claims (1)

Condensate generated from multiple steam-using devices is collected by a condensate recovery pump to a condensate recovery destination such as a boiler or a water supply tank.
The condensate generated in a plurality of steam-using equipment is set to the horizontally long cylindrical sealed condensate tank one,
Attach a condensate tank cooling means to cool the sealed condensate tank,
The condensate tank cooling means is constituted by a coiled heat exchange pipe attached inside the sealed condensate tank,
Wherein by sealed the re-evaporation steam and partially in a condensate tank condensate is cooled by the heat exchange pipe, re-evaporated steam is reduced sharply the volume by a re-condenser, the sealed recovery While reducing the pressure in the water tank to a low pressure,
Condensate pumping means for pumping the condensate collected in the sealed condensate tank to a predetermined location ,
Communicated with the closed condensate tank through a steam outlet and a condensate inlet,
When the internal float is located in the lower part, the high pressure steam inlet is closed and the steam outlet is opened, so that the condensate in the hermetic condensate tank can be fed into the condensate pumping means from the condensate inlet. Flow down to
When the internal float is located in the upper part, the condensate pressure is used to pump the condensate accumulated in the condensate pumping means to a predetermined location by opening the high-pressure steam inlet and closing the steam outlet. A condensate recovery device characterized by connecting a feeding means .

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