JP2004278871A - Condensate re-evaporation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a condensate re-evaporation device capable of reliably allowing condensate to flow down to a liquid force feed member side from a re-evaporation tank. <P>SOLUTION: The condensate re-evaporation device is constituted by connecting a condensate feed pipe 2 and a communication pipe 8 to an upper part of a re-evaporation tank 1. A pressure sensor 9 and a pressure control valve 4 are fitted to the communication pipe 8 so as to be connected to a suction chamber 12 of an ejector 3, and a steam feed pipe 11 is connected to the ejector 3. A liquid force feed member 7 is disposed on a predetermined lower part of the re-evaporation tank 1 and connected via a connection pipe 5. In the condensate re-evaporation device, a part of condensate fed from the condensate feed pipe 2 to the re-evaporation tank 1 is re-evaporated, and sucked by the ejector 3 through the communication pipe 8, and the remaining condensate flows down into the liquid force feed member 7 from a liquid inlet 15 of the liquid force feed member 7 disposed on a predetermined lower part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a condensate re-evaporation device for re-evaporating high-temperature condensate in which steam is condensed in a re-evaporation tank and reusing the condensed steam as steam.
[0002]
[Prior art]
[Patent Document 1] Japanese Patent Application Laid-Open No. 9-196305 In this, an ejector is interposed in a steam supply pipe for supplying steam to a steam-using device, and a re-evaporation tank is connected to the outlet side of the steam-using device via a steam trap. Then, a condensate recovery device in which the upper part of the re-evaporation tank is connected to an ejector is disclosed.
[Patent Document 2] Japanese Patent Application Laid-Open No. H10-61885 discloses a liquid pumping member having a liquid inlet and a liquid outlet for pumping, and a working steam inlet and a working steam outlet as high-pressure gas. It has been disclosed.
[0003]
[Problems to be solved by the invention]
In the conventional re-evaporation tank disclosed in Patent Literature 1, when the amount of condensate flowing from the steam trap is relatively small, the condensate does not flow down to the downstream side of the re-evaporation tank, and the There was a problem that the condensate would stay. This is because if the amount of condensate flowing into the re-evaporation tank is small, the amount of re-evaporated steam will also be small, and the suction force of the ejector will cause the inside of the re-evaporation tank to be in a reduced pressure state and a negative pressure state below atmospheric pressure. This is because condensed water cannot flow naturally to the downstream side of the tank.
[0004]
Accordingly, an object of the present invention is to provide a condensate re-evaporation device that can surely condensate down from the re-evaporation tank to the downstream side regardless of the amount of condensate flowing in.
[0005]
[Means for Solving the Problems]
Means of the present invention taken to solve the above-mentioned problem is that a condensate supply pipe is connected to a re-evaporation tank, and an ejector for suctioning re-evaporated steam of the condensate in the re-evaporation tank is connected. In a predetermined lower portion of the re-evaporation tank, a liquid pumping member for pumping a liquid such as hot water with high-pressure compressed air or a gas such as steam is disposed, and a liquid inlet of the liquid pumping member and the re-evaporation tank are connected by a connecting pipe. Are connected by
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
By arranging the liquid pumping member below the re-evaporation tank at a predetermined position, even if the inside of the re-evaporation tank is in a depressurized state or a negative pressure state below the atmospheric pressure, the liquid inlet of the liquid pumping member is at a predetermined lower part. By maintaining the head height corresponding to the distance, the condensate can flow down reliably from the re-evaporation tank to the liquid pumping member.
[0007]
【Example】
In FIG. 1, a re-evaporation tank 1, a condensate supply pipe 2 for supplying condensate to the re-evaporation tank 1, an ejector 3, and a liquid pumping member 7 constitute a condensate re-evaporation apparatus.
[0008]
The re-evaporation tank 1 is cylindrical and hermetically sealed. A condensate supply pipe 2 is connected to the upper part of the side, and a condensate outlet pipe 5 as a connecting pipe is connected to the lower part of the side. The condensate supply pipe 2 is connected to a condensate generation source such as a steam-using device (not shown) via a valve 6. On the other hand, the condensate outlet pipe 5 is connected to the liquid inlet 15 of the liquid pumping member 7 via a check valve 14. The check valve 14 allows only the flow of the liquid from the re-evaporation tank 1 to the liquid pumping member 7 and does not allow the liquid to pass to the opposite side.
[0009]
The liquid pumping member 7 has a liquid inlet 15 and a liquid outlet 16, a high-pressure operating fluid inlet 17 and a high-pressure operating fluid outlet 18, and discharges condensate to the liquid outlet 16 via a check valve 19. The pipe 20 is connected, and a high-pressure steam pipe 21 which branches off a steam discharge pipe 13 described later is connected to the high-pressure operating fluid inlet 17. On the other hand, the high-pressure operation fluid discharge port 18 communicates with the upper part of the re-evaporation tank 1 by the equalizing pipe 22.
[0010]
The liquid pumping member 7 is disposed below the condensate from the re-evaporation tank 1 with a distance as far as possible to flow naturally. Further, when the float (not shown) disposed inside is located at the lower part, the liquid pressure feeding member 7 closes the high pressure operation fluid introduction port 17 and opens the high pressure operation fluid discharge port 18 to open the reevaporation tank. Condensate flows from 1 through the check valve 14 and the liquid inlet 15 into the liquid pumping member 7. When the condensed water accumulates in the liquid pressure feeding member 7 and a float (not shown) is located at a predetermined upper portion, the high pressure operation fluid discharge port 18 is closed, while the high pressure operation fluid introduction port 17 is opened, and the high pressure steam pipe is opened. The condensed water collected inside is sent to the predetermined location through the liquid outlet 16, the check valve 19, and the condensate discharge pipe 20 by flowing the high-pressure pressure-feeding steam from the inside 21.
[0011]
When the condensate is pressure-fed and the liquid level in the liquid pumping member 7 decreases, the high-pressure operation fluid introduction port 17 is closed again and the high-pressure operation fluid discharge port 18 is opened, so that the condensate is discharged from the liquid inlet 15. Let it flow down inside. By repeating such an operation cycle, the liquid pumping member 7 pumps condensed water from the re-evaporation tank 1 to a predetermined location.
[0012]
A communication pipe 8 is connected to the upper surface of the re-evaporation tank 1 to communicate the pressure control valve 4 with the ejector 3. The pressure control valve 4 uses a pressure sensor 9 and a controller 10 in combination. The pressure sensor 9 detects the pressure in the communication pipe 8, that is, the pressure in the re-evaporation tank 1, and automatically controls the opening degree of the pressure control valve 4 so as to reach the set pressure set by the controller 10.
[0013]
A steam supply pipe 11 is connected to the ejector 3, and an end of the communication pipe 8 is connected to a suction chamber 12 of the ejector 3. The ejector 3 generates a predetermined suction force in the suction chamber 12 by the high-pressure steam supplied from the steam supply pipe 11 to suck the re-evaporated steam in the re-evaporation tank 1.
[0014]
Condensed water supplied from the condensate supply pipe 2 into the re-evaporation tank 1 is partially re-evaporated in the re-evaporation tank 1 and is sucked from the communication pipe 8 to the ejector 3. In this case, the pressure in the re-evaporation tank 1 is controlled by the pressure control valve 4 attached to the communication pipe 8 into a predetermined pressure state regardless of the supplied condensed water amount, that is, from the re-evaporation tank 1 to the liquid pressure feeding member 7. By maintaining the condensed water at such a pressure that it can flow naturally, the condensed water in the re-evaporation tank 1 can also flow down into the liquid pumping member 7.
[0015]
The pressure in the re-evaporation tank 1 can be increased by setting the pressure in the re-evaporation tank 1 to a relatively low pressure that allows the condensate to naturally flow by the pressure control valve 4. Thus, the conversion rate of the condensed water to the re-evaporated steam can be increased.
[0016]
The re-evaporated steam in the re-evaporation tank 1 sucked by the ejector 3 is mixed with the steam from the steam supply pipe 11 and delivered from the steam discharge pipe 13 to a separate steam use location (not shown).
[0017]
【The invention's effect】
As described above, according to the present invention, by disposing the liquid pumping member at a predetermined position below the reevaporation tank, the condensate in the reevaporation tank can flow down to the liquid pumping member side reliably.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a condensate re-evaporation apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Re-evaporation tank 2 Condensate supply pipe 3 Ejector 4 Pressure control valve 5 Connecting pipe 7 Liquid pumping member 11 Steam supply pipe 14 Check valve 15 Liquid inlet 16 Liquid outlet 17 High-pressure operating fluid inlet 18 High-pressure operating fluid outlet

Claims (1)

A condensate supply pipe is connected to the re-evaporation tank, and an ejector for sucking the re-evaporated vapor in the re-evaporation tank is connected to the re-evaporation tank. A re-evaporation device for condensed water, wherein a liquid pumping member for pressure-feeding with a gas such as compressed air or steam is arranged, and a liquid inlet of the liquid pumping member and a re-evaporation tank are connected by a connecting pipe.

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