JP2004278874A - Condensate re-evaporation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a condensate re-evaporation device capable of increasing re-evaporation amount of condensate in a re-evaporation tank without discharging high-temperature condensate from the 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 liquid force-feed member 7 is disposed on a predetermined lower part of the re-evaporation tank 1 and connected via a condensate outlet pipe 5. A temperature regulating valve 23 is fitted to the condensate outlet 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 the temperature regulating valve 23 only when the temperature of the remaining condensate is low. <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. Hei 9-196305 In this, a re-evaporation tank is connected to the outlet side of a steam-using device via a steam trap, and the re-evaporation steam generated in the re-evaporation tank is sucked by an ejector. A condensate recovery device is disclosed in which a vortex pump is connected to a lower portion of a re-evaporation tank and supplied to a predetermined re-evaporation steam use point.
[0003]
[Problems to be solved by the invention]
The above-mentioned conventional re-evaporation tank has a problem in that more re-evaporated steam cannot be obtained in the re-evaporation tank. This is because regardless of the temperature of the condensed water stored in the re-evaporation tank, that is, the condensate still in a high temperature state is sucked and discharged from the re-evaporation tank by the spiral pump.
[0004]
Accordingly, an object of the present invention is to provide a condensate re-evaporation apparatus capable of increasing the amount of condensate re-evaporation in a re-evaporation tank without discharging hot condensate from the re-evaporation tank. It is.
[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 the re-evaporation tank, and steam generated by re-evaporating the condensate in the re-evaporation tank is re-evaporated steam. In the equipment to be supplied to the point of use, the suction chamber of the ejector is connected to the re-evaporation tank, and a temperature control valve that can control the temperature of the condensate discharged is installed at the condensate outlet of the re-evaporation tank. A liquid pumping member for pumping the liquid with a gas such as high-pressure compressed air or steam is disposed.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Part of the condensed water supplied from the condensate supply pipe to the re-evaporation tank is re-evaporated and sucked into the suction chamber of the ejector, and the condensed water that cannot be completely re-evaporated accumulates in the re-evaporation tank. By installing a temperature control valve at the condensate outlet of the re-evaporation tank, the temperature of the condensate discharged from the re-evaporation tank can be controlled arbitrarily. When the temperature of the condensate is low, the temperature control valve is opened. In the re-evaporation tank, the condensate flows down to the liquid pumping member, while if the condensate temperature is high, the temperature control valve is closed to prevent the condensate from flowing down to the liquid pumping member. The amount of re-evaporation of condensate can be increased.
[0007]
【Example】
In FIG. 1, the re-evaporation tank 1, a condensate supply pipe 2 for supplying condensate to the re-evaporation tank 1, an ejector 3 connected to the upper part of the re-evaporation tank 1, and a condensate outlet of the re-evaporation tank 1 The condensate outlet pipe 5, the temperature control valve 23 attached to the condensate outlet pipe 5, and the liquid pumping member 7 connected to the lower end of the condensate outlet pipe 5 constitute a condensate reevaporation apparatus.
[0008]
The re-evaporation tank 1 has a cylindrical shape and has a condensate supply pipe 2 connected to the upper side and a condensate outlet pipe 5 connected to the lower 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 pressure feeding member 7 via a temperature control valve 23 and a check valve 14. The check valve 14 allows only the liquid to flow downward from the re-evaporation tank 1 to the liquid pumping member 7 below, and does not allow the liquid to pass to the opposite side. Further, an overflow pipe 24 is attached to the upper left side of the re-evaporation tank 1.
[0009]
When the temperature of the condensate in the condensate outlet pipe 5 or the re-evaporation tank 1 is lower than a predetermined value, the temperature control valve 23 is opened to allow the low-temperature condensate to flow down to the liquid pumping member 7. If the temperature of the water becomes higher than a predetermined value, any valve can be used as long as the valve can be closed and the high-temperature condensate can be retained in the re-evaporation tank 1. For example, an automatic temperature control valve or a self-operated temperature control valve can be used. Alternatively, a conventional trap called a temperature control trap can be used.
[0010]
The lower end of the condensate outlet pipe 5 is connected to the liquid pumping member 7. As the liquid pumping member 7, for example, the one disclosed in Japanese Patent Application Laid-Open No. 10-61885 can be used. That is, 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 returns to the liquid outlet 16 via the check valve 19. A water discharge pipe 20 is connected, and a high-pressure steam pipe 21 which branches off a steam discharge pipe 13 to be 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.
[0011]
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. From 1, the low-temperature condensate flows down into the liquid pumping member 7 through the temperature control valve 23, the check valve 14, and the liquid inlet 15.
[0012]
When the low-temperature condensate is collected 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 21 is opened. The high-pressure pressurized steam is caused to flow into the inside, whereby the low-temperature condensate collected therein is pumped to a predetermined location through the liquid outlet 16, the check valve 19, and the condensate discharge pipe 20.
[0013]
When the low-temperature condensate is pressure-fed and the liquid level in the liquid pumping member 7 drops, the high-pressure operation fluid inlet 17 is closed again and the high-pressure operation fluid outlet 18 is opened, so that the low-temperature condensate is discharged from the liquid inlet 15. Let the water flow down. By repeating such an operation cycle, the liquid pumping member 7 pumps low-temperature condensate from the re-evaporation tank 1 to a predetermined location.
[0014]
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.
[0015]
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.
[0016]
The 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. Collects in tank 1. In this case, only when the temperature of the condensed water is low, the temperature control valve 23 is opened to flow down into the liquid pumping member 7, and when the temperature of the condensed water is high, the temperature control valve 23 is closed and the high-temperature condensate is conveyed. By staying in the reevaporation tank 1, the amount of reevaporation in the reevaporation tank 1 increases.
[0017]
Further, the pressure in the re-evaporation tank 1 is set to a predetermined pressure state by the pressure control valve 4 attached to the communication pipe 8, that is, a pressure state in which the condensate can flow naturally from the re-evaporation tank 1 into the liquid pressure feeding member 7. By maintaining, the low-temperature condensate in the re-evaporation tank 1 can flow down into the liquid pumping member 7.
[0018]
As described above, the pressure in the re-evaporation tank 1 is set to a relatively low pressure that allows the condensate to naturally flow by the pressure control valve 4, thereby further increasing the re-evaporation amount of the condensate in the re-evaporation tank 1. And the conversion rate of condensed water to reevaporated steam can be increased.
[0019]
The re-evaporated steam in the re-evaporation tank 1 sucked by the ejector 3 is mixed with the high-pressure steam from the steam supply pipe 11 and delivered from the steam discharge pipe 13 to a separate steam use location (not shown).
[0020]
【The invention's effect】
As described above, according to the present invention, the ejector is connected to the upper part of the re-evaporation tank, and the temperature control valve and the liquid pumping member are attached to the condensate outlet of the re-evaporation tank. The amount of condensed water re-evaporated in the re-evaporation tank can be increased without discharging from the tank.
[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 Condensate outlet pipe 7 Liquid pumping member 11 Vapor supply pipe 15 Liquid inlet 16 Liquid outlet 17 High-pressure operating fluid inlet 18 High-pressure operating fluid outlet 23 Temperature Control valve

Claims (1)

A condensate supply pipe is connected to the re-evaporation tank, and steam generated by re-evaporation of the condensate in the re-evaporation tank is supplied to a point where the re-evaporation steam is used. And a temperature control valve that can control the temperature of the condensate discharged at the condensate outlet of the re-evaporation tank, and a liquid that pumps liquid such as hot water with high-pressure compressed air or steam. A condensate re-evaporation device comprising a pumping member.

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