JPH10227406A - Liquid forced feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable re-evaporated steam to be reduced with a less amount of cooling fluid. SOLUTION: An ejector 3 is fixed to a high temperature liquid container 1. A nozzle part 8 of the elector 3 is connected to a compressed air supplying pipe 4. A cooling fluid supplying pipe 5 is connected to a suction port 9 of the ejector 3. A diffuser 11 is opened at an upper part of the high temperature liquid container 1 and connected there. A pump means 6 is connected to a lower part of the high temperature liquid container 1. A pipe 22 for forcedly feeding liquid from the pump means 6 is connected to the cooling fluid supplying pipe 5. Compressed air supplied to the ejector 3 sucks cooling fluid from the cooling fluid supplying pipe 5 and is supplied into the high temperature liquid container 1 while being mixed with it, the re-evaporated steam in the high temperature liquid container 1 is heat exchanged and condensed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid pumping device for pumping a liquid such as fuel or water, and more particularly to a device for reducing reevaporation vapor generated when a high-temperature liquid is pumped. The liquid pumping device of the present invention is particularly suitable as a device for once collecting condensed water as condensed water of steam generated in a steam system and for pumping the condensed water which is a high-temperature liquid to a boiler or a waste heat utilization device. is there.

[0002]

2. Description of the Related Art As a conventional liquid pumping apparatus of this kind,
For example, there is one disclosed in JP-A-7-139705. This is a steam ejector in which a steam ejector, a condensate tank, and a fluid pressure pump type pump are sequentially connected to the secondary side of the steam-using device. The water is sucked and stored in a condensate tank, and the condensate in the condensate tank is pumped to a predetermined location such as a boiler by a pump means.

[0003]

In the above-mentioned conventional liquid pumping apparatus, a large amount of re-evaporated steam is generated in a condensate tank for storing condensed water as a high-temperature liquid, and the environment is degraded due to mist and sting around the tank. There was a problem.

[0004] Further, there is a problem that a large amount of cooling water is required in order to reliably condense the re-evaporated steam that is trapped in the mist and reduce the re-evaporated steam to such an extent that the deterioration of the environment is prevented.

[0005] Accordingly, it is an object of the present invention to provide a liquid pumping apparatus which can reduce re-evaporated steam without requiring a large amount of cooling fluid.

[0006]

Means taken to solve the above problem is to store at least two kinds of high-temperature liquids in a high-temperature liquid container for storing the high-temperature liquid. A mixer for mixing a fluid is attached, a compressed air supply pipe and a cooling fluid supply pipe are connected to the mixer, and an outlet of the mixer communicates with the inside of the high-temperature liquid container.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS By connecting a compressed air supply pipe and a cooling fluid supply pipe to a mixer attached to a high temperature liquid container, the compressed air and the cooling fluid are mixed by the mixer, and the high temperature liquid is supplied from an outlet. It is supplied to the inside of the container. In this case, the pressure of the compressed air reaching the high-temperature liquid container decreases from a high-pressure state before the supply to a low-pressure state in the container, and the compressed air undergoes adiabatic expansion. The cooling fluid mixed by the adiabatic expansion is deprived of heat to a lower temperature state, so that the re-evaporated vapor in the high-temperature liquid container can be rapidly cooled and condensed.

[0008] Condensation of the vapor proceeds by the rate at which the compressed air adiabatically expands and cools the cooling fluid. Compared to the case where only the cooling fluid is supplied and the re-evaporated steam is condensed, less cooling fluid is used. Thus, the steam can be surely condensed, and the amount of re-evaporated steam that can accumulate can be reduced.

As a mixer for mixing the compressed air and the cooling fluid, for example, an ejector having a built-in nozzle can be used. That is, connect the compressed air supply pipe to the nozzle,
Connect the cooling fluid supply pipe to the suction port of the ejector,
By communicating the outlet of the ejector with the inside of the high-temperature liquid container, the compressed air passing through the nozzle adiabatically expands while sucking the cooling fluid and is supplied to the high-temperature liquid container, condensing the re-evaporated vapor in the container. Moire can be reduced.

[0010]

1, a high-temperature liquid container 1, a condensate supply pipe 2 for supplying a high-temperature liquid such as condensate to the high-temperature liquid container 1,
Ejector 3 as a mixer attached to high-temperature liquid container 1
, A compressed air supply pipe 4 and a cooling fluid supply pipe 5 connected to the ejector 3, and a pump unit 6 as a liquid pumping unit, constitute a liquid pumping device.

The compressed air supply pipe 4 is connected to a supply source of high-pressure compressed air (not shown) and is connected to a nozzle 8 of an ejector 3 as a mixer via a valve 7. A throttle portion is built in the nozzle portion 8 and a suction port 9 is provided on an outer peripheral portion thereof. The cooling fluid supply pipe 5 is connected to the suction port 9 via a valve 10.

A diffuser section 11 is provided below the nozzle section 8 and is attached to the upper opening 12 of the high-temperature liquid container 1. At the lower part of the diffuser section 11, injection ports 13 and 14 for injecting compressed air or a mixed fluid of the compressed air and the cooling fluid to the entire lower periphery of the diffuser section 11 are attached. The compressed air or the mixed fluid injected from the injection ports 13 and 14 is
The re-evaporated vapor in the high-temperature liquid container 1 is prevented from being discharged to the outside from the opening 12 and the re-evaporated vapor is diffused.
It is collected under the part 11 to promote condensation. A dispersing plate 15 for dispersing a mixed fluid of the compressed air and the cooling fluid over substantially the entire inside of the high-temperature liquid container 1 is attached below the diffuser section 11 and above the high-temperature liquid container 1. The dispersion plate 15 has a substantially conical shape and a plurality of communication holes 16.

The condensate supply pipe 2 is connected via a steam trap 17 to the outlet side of a steam-using device (not shown), a re-evaporation tank, or the like, and supplies condensate as a high-temperature liquid into the high-temperature liquid container 1. The condensed water that has reached the high-temperature liquid container 1 is re-evaporated in the container 1.

At the lower end of the high-temperature liquid container 1, pump means 6 serving as a liquid pumping means is provided with condensed reevaporated vapor and cooling fluid.
The pipe 18 for flowing down to the valve 19 and the check valve 20
Connect through. The check valve 20 permits only the flow of the fluid from the high-temperature liquid container 1 to the pump means 6, and prevents the passage of the fluid opposite thereto.

The pump means 6 serves to flow the liquid down from the pipe 18 and to pump the liquid from the pipe 22 provided with the check valve 21 to a predetermined location. Connect to tube 5. The pump means 6 is connected to a high-pressure pumping fluid pipe 24 for supplying a high-pressure pumping fluid via a valve 23, and a discharge pipe 25 for discharging the high-pressure pumping fluid after the pumping to the outside via a valve 26. Connecting. The compressed air supply pipe 4 can also be branched and connected to the high-pressure pumping fluid pipe 24.

When the liquid flowing from the high-temperature liquid container 1 through the check valve 20 into the pump means 6 reaches a predetermined liquid level,
The inside of the pump means 6 communicates with the high-pressure pumping fluid pipe 24 by operating the liquid level detecting mechanism provided therein, and the discharge pipe 25 is shut off. Pipe 2 through the check valve 21
2 to a predetermined location.

When reducing the re-evaporated vapor generated in the high-temperature liquid container 1, the compressed air and the cooling fluid are mixed by the ejector 3 as a mixer and supplied to the high-temperature liquid container 1 so that the re-evaporated vapor is generated. Condensed to reduce mist. That is, the compressed air supplied from the compressed air supply pipe 4 is throttled by the nozzle portion 8 of the ejector 3 to increase the flow velocity, generate a suction force, suck the cooling fluid from the suction port 9 and mix, thereby mixing the high-temperature liquid container 1. Supplied inside. In this case, the cooling fluid is mixed with the compressed air while being cooled by the adiabatic expansion of the compressed air. The mixed fluid of the compressed air and the cooling fluid is the dispersion plate 1
5 supplies the high-temperature liquid container 1 so as to cover the entire inside thereof. The supplied mixed fluid exchanges heat with the re-evaporated steam filled in the high-temperature liquid container 1, condenses the re-evaporated steam, and flows down from the lower end pipe 18 to the pump means 6.

The liquid flowing down to the pump means 6 is pumped from the pipe 22 to a predetermined location as described above. In this embodiment, since the cooling fluid supply pipe 5 and the pipe 22 are connected, a part of the pumping liquid from the pump unit 6 can be used as a cooling fluid to be supplied to the high-temperature liquid container 1.

In this embodiment, an example is shown in which the ejector 3 as one mixer is arranged in the high-temperature liquid container 1, but it is determined according to the size of the high-temperature liquid container 1 and the amount of re-evaporated vapor to be condensed. The number of ejectors 3 is not limited to one, and two or more ejectors 3 can be arranged.

[0020]

According to the present invention, the cooling fluid can be supplied to the high temperature liquid container in a low temperature state by the adiabatic expansion of the compressed air, and the re-evaporation vapor can be reliably reduced with less cooling fluid. it can.

Also, not only the cooling fluid from the mixer,
The compressed air that has been adiabatically expanded and cooled to a low temperature is also supplied as a mixture, and the vapor in the high-temperature liquid container can be more reliably condensed and reduced.

[Brief description of the drawings]

FIG. 1 is a partial sectional configuration view showing an embodiment of a liquid pressure feeding device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High temperature liquid container 2 Condensate supply pipe 3 Ejector 4 Compressed air supply pipe 5 Cooling fluid supply pipe 6 Pump means 8 Nozzle part 9 Suction port 11 Diffuser 15 Dispersion plate 20 and 21 Check valve 24 High pressure pressure supply fluid pipe

Claims (1)

[Claims] An apparatus for storing a high-temperature liquid in a container and pumping the high-temperature liquid to a predetermined location, wherein a high-temperature liquid container for storing the high-temperature liquid is provided with a mixer for mixing at least two types of fluids,
A liquid pumping device, wherein a compressed air supply pipe and a cooling fluid supply pipe are connected to the mixer, and an outlet of the mixer communicates with the inside of the high-temperature liquid container.