JP2004278870A - 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 to the downstream side from a re-evaporation tank irrespective of the inflow of condensate. <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. 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. In this case, the inside of the re-evaporation tank 1 is maintained at a predetermined pressure state by the pressure control valve 4. Condensate in the re-evaporation tank 1 can be discharged to the downstream side from a condensate outlet pipe 5 without any stagnation. <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.
[0003]
[Problems to be solved by the invention]
In the conventional re-evaporation tank, when the amount of condensate flowing from the steam trap is small, there is a problem that the condensate does not flow down the downstream side of the re-evaporation tank. 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. , A pressure control valve is arranged between the re-evaporation tank and the ejector, and the pressure control valve maintains the inside of the re-evaporation tank at a predetermined pressure.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
By disposing a pressure control valve between the re-evaporation tank and the ejector and maintaining the inside of the re-evaporation tank at a predetermined pressure state, the inside of the re-evaporation tank becomes a reduced pressure state or a negative pressure state below the atmospheric pressure. This can prevent the condensate from flowing down from the re-evaporation tank to the downstream side.
[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 pressure control valve 4 constitute a condensate re-evaporation 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 source such as a device using steam (not shown) via a valve 6. On the other hand, a steam trap 7 is interposed in the condensate outlet pipe 5. The steam trap 7 discharges only condensed water in the re-evaporation tank 1 to the outside, and does not discharge steam.
[0009]
The connection 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 in the present embodiment shows an example using a so-called automatic pressure control valve in which a pressure sensor 9 and a controller 10 are combined. The pressure sensor 9 detects the pressure in the connection 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.
[0010]
A steam supply pipe 11 is connected to the ejector 3, and an end of the connecting 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.
[0011]
Condensed water supplied from the condensate supply pipe 2 into the re-evaporation tank 1 is re-evaporated in the re-evaporation tank 1 and sucked from the connecting 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 connecting pipe 8 to a predetermined pressure state, that is, a reduced pressure state such as a negative pressure state below the atmospheric pressure regardless of the supplied condensed water amount. Will be maintained. By maintaining the inside of the re-evaporation tank 1 at a predetermined pressure state, the condensate in the re-evaporation tank 1 flows down to the condensate outlet pipe 5 and the steam trap 7 and is reliably discharged to the outside. Is done.
[0012]
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).
[0013]
【The invention's effect】
As described above, according to the present invention, by installing a pressure control valve between the re-evaporation tank and the ejector and maintaining the inside of the re-evaporation tank at a predetermined pressure state, regardless of the amount of inflowing condensate, Condensed water can flow down reliably from the evaporation tank to the downstream side.
[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 7 Steam trap 8 Connecting pipe 9 Pressure sensor 10 Controller 11 Steam supply pipe

Claims (1)

A condensate supply pipe is connected to the re-evaporation tank, and an ejector for suctioning the re-evaporated vapor in the re-evaporation tank is connected, and a pressure control valve is arranged between the re-evaporation tank and the ejector. And a pressure control valve for maintaining the inside of the re-evaporation tank at a predetermined pressure state.

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