JPH10253270A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat exchanger, capable of condensing vapor surely with a small amount of cooling fluid. SOLUTION: A heat exchanging vessel 1 is divided into an upper chamber 20 and a lower chamber 21. The upper chamber 20 is communicated with the lower chamber 21 through a communicating pipe 23. An ejector 4 is attached to the inside of the upper chamber 20 and the nozzle unit 7 of the ejector 4 is connected to a cooling fluid supplying pipe 3. The suction port 8 of the ejector 4 is opened in the upper chamber 20. A coil type indirect heat exchanging unit 5 is connected to the diffuser 9 of the ejector 4. The cooling fluid, supplied to the ejector 4, is supplied into the indirect heat exchanging unit 5 while making a part of vapor in the upper chamber 20 through the suction port 8 to effect the heat exchange of vapor in the upper chamber 20 of the heat exchanging vessel 1 furthermore and condense the vapor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for condensing steam remaining in a steam-using device or reevaporated steam generated from a high-temperature drain by exchanging heat with a cooling fluid such as water. The present invention relates to a device that eliminates steam that can accumulate in a steam or uses a cooling fluid that has undergone heat exchange separately to effectively use the retained heat of the steam.

[0002]

2. Description of the Related Art A conventional heat exchanger of this type is disclosed, for example, in Japanese Patent Application Laid-Open No. 60-120186. This is achieved by installing a cooling pipe inside a heat recovery chamber having a steam supply port, connecting the air release section to this heat recovery chamber, and storing condensate in the air release section and the lower part of the heat recovery chamber.
It is possible to prevent the non-condensable gas from flowing into the heat recovery chamber and efficiently exchange heat.

[0003]

The conventional heat exchanger has a problem that a large amount of cooling water is required to completely condense the steam. In other words, the supplied steam only exchanges heat with the cooling pipe in the heat recovery chamber, so when it is necessary to completely condense a large amount of steam as in the case where it is necessary to eliminate the state in which the steam can be trapped. A large amount of cooling water is required.

Accordingly, it is an object of the present invention to provide a heat exchanger capable of reliably condensing steam without requiring a large amount of cooling fluid.

[0005]

Means taken to solve the above problem is to supply steam and a cooling fluid to a heat exchange container, and to condense the steam by exchanging heat with the cooling fluid. In the apparatus, the heat exchange vessel is divided into at least two upper and lower chambers, a communication pipe for communicating the divided chambers is attached, and a steam supply pipe for supplying steam to condense the lower chamber divided into at least two upper and lower chambers. Connected, a cooling fluid supply pipe and an ejector connected to the upper chamber, the suction part of the ejector is opened in the upper chamber, and an indirect heat exchange part is connected to the outlet side of the ejector in the upper chamber of the heat exchange container. It is.

[0006]

DETAILED DESCRIPTION OF THE INVENTION The vapor to be condensed in the lower chamber of the heat exchange vessel reaches the upper chamber through a communication pipe. In the upper chamber, an ejector having an open suction unit is connected to the cooling fluid supply pipe, so that the vapor is sucked into the suction unit of the ejector to be condensed. The sucked steam is mixed with the cooling fluid in the ejector and supplied to an indirect heat exchange unit connected to the outlet side, and the indirect heat exchange unit further condenses the steam in the upper chamber.

As described above, only the vapor that has reached the upper chamber of the heat exchange vessel is sucked by the ejector and mixed with the cooling fluid, and is condensed by heat exchange in the indirect heat exchange section. Therefore, as compared with the conventional heat exchanger in which only heat is exchanged in the cooling pipe, the condensation of the steam is advanced by the rate sucked by the ejector, and the steam can be surely condensed with a smaller cooling fluid.

[0008]

1, a heat exchange vessel 1, a steam supply pipe 2 for supplying steam to be condensed, and a cooling fluid supply pipe 3 are shown.
And an ejector 4 connected to the cooling fluid supply pipe 3 and arranged in the heat exchange vessel 1 and an indirect heat exchange section 5 connected to the outlet side of the ejector 4 to form a heat exchanger.

The heat exchange vessel 1 is divided into upper and lower two chambers 20 and 21 by a partition wall 22 and a communication pipe 23 is attached to the partition wall 22 to communicate the upper chamber 20 and the lower chamber 21. Also, partition 2
2 is provided with a through hole 24, and a liquid drain generated by condensation of the vapor in the upper chamber 20 is dropped into the lower chamber 21.

[0010] The cooling fluid supply pipe 3 connected to the upper chamber 20 is connected to a cooling fluid source such as cooling water (not shown) and is connected to the nozzle portion 7 of the ejector 4 via the valve 6. The nozzle unit 7 has a built-in throttle unit and a suction port 8 as a suction unit. The upper end of the suction port 8 is opened to communicate with the upper chamber 20. A diffuser section 9 is provided on the right side of the nozzle section 7, and a coil-like indirect heat exchange section 5 is further disposed below the diffuser section 9.

The indirect heat exchanging section 5 is disposed so as to extend over the entire inside of the upper chamber 20 using a material having high thermal conductivity such as a copper pipe, and the lower end thereof is connected to the cooling fluid discharge pipe via a valve 10. 11 is connected. The cooling fluid discharge pipe 11 exchanges heat with the steam in the upper chamber 20 in the ejector 4 and the indirect heat exchange section 5 to guide the cooling fluid whose temperature has increased to a separate use location.

An open-to-atmosphere pipe 13 is attached to the upper part of the upper chamber 20 of the heat exchange vessel 1 via a valve 12. Valve 1
The upper chamber 20 communicates with the atmosphere by opening the valve 2, and can be shut off by closing the valve. Further, a degassing valve 16 is attached via a valve 15.
The degassing valve 16 automatically removes non-condensable gas such as air accumulated in the upper chamber 20 to the outside, and uses a heat sensitive element such as bimetal or thermo wax (not shown).
When the ambient temperature becomes lower than a predetermined temperature, for example, 80 ° C. or lower, the valve is opened to remove gas, and when the temperature becomes higher than the predetermined temperature, the valve is closed to prevent leakage of steam to the outside.

A steam supply pipe 2 connected to the lower chamber 21 is connected to an outlet side of a steam-using device (not shown), a re-evaporation tank or the like to supply steam to the lower chamber 21 of the heat exchange vessel 1 for condensation. Therefore, the steam supplied from the steam supply pipe 2 to be condensed stays in the lower chamber 21, and the steam is supplied to the communication pipe 2.
3 and into the upper chamber 20. A pipe 17 for supplying condensed steam to a predetermined location is connected to the lower end of the lower chamber 21.

The cooling fluid supplied from the cooling water supply pipe 3 is throttled by the nozzle portion 7 of the ejector 4 to increase the flow velocity, generate a suction force, and suck a part of the steam in the upper chamber 20 from the suction port 8. And mixed and supplied to the indirect heat exchange unit 5. Therefore, the vapor is sucked into the ejector 4 to be condensed, mixed with the cooling fluid and condensed, and further condensed by the indirect heat exchange section 5. The condensed vapor turns into a liquid drain to form a partition 2
The liquid is dropped into the lower chamber 21 from the second through hole 24 and supplied to a predetermined location through the pipe 17.

The drain dropped from the through hole 24 of the partition 22 into the lower chamber 21 can condense a part of the vapor in the lower chamber 21.

Only the vapor that has reached the upper chamber 20 from the lower chamber 21 of the heat exchange vessel 1 is sucked by the ejector 4 and mixed with the cooling fluid, and is further heat-exchanged by the indirect heat exchange unit 5 to be further condensed. Is done.

In this embodiment, an example in which one ejector 4 is disposed in the upper chamber 20 of the heat exchange vessel 1 has been described. However, the number of ejectors 4 depends on the size of the heat exchange vessel 1 and the amount of steam supply. Can be appropriately arranged even if two or more units are used.

[0018]

According to the present invention, the heat exchange vessel is divided into at least two upper and lower chambers, and only steam is condensed to the upper chamber, and the steam is sucked and cooled by the suction portion of the ejector in the upper chamber. As well as mixing with the fluid, the steam can be further condensed in the indirect heat exchange section connected to the outlet side of the ejector, and the steam can be surely condensed with less cooling fluid.

Further, since the steam is sucked into the suction portion of the ejector, the convection of the steam in the upper chamber of the heat exchange container is promoted, the efficiency of heat exchange with the indirect heat exchange portion is improved, and the steam is more reliably. Can be condensed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a heat exchanger of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchange container 2 Steam supply pipe 3 Cooling fluid supply pipe 4 Ejector 8 Suction port 11 Cooling fluid discharge pipe 16 Gas release valve 20 Upper chamber 21 Lower chamber 22 Partition wall 23 Communication pipe

Claims (1)

[Claims] 1. A method in which steam and a cooling fluid are supplied to a heat exchange vessel and the steam is condensed by exchanging heat with the cooling fluid, wherein the heat exchange vessel is divided into at least two upper and lower chambers. A communication pipe for communicating the respective chambers is attached, a steam supply pipe for supplying steam to be condensed is connected to at least a lower chamber divided into upper and lower chambers, and a cooling fluid supply pipe and an ejector are connected to the upper chamber. A heat exchanger, characterized in that a suction part of an ejector is opened in an upper chamber and an indirect heat exchange part is connected to an outlet side of the ejector in the upper chamber of the heat exchange container.