JPH10227407A - 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 through an eddy flow pipe 30. A compressed air supplying pipe 4 is connected to the eddy flow pipe 30 and a low temperature air outlet 32 is connected to a nozzle part 8 of the ejector 3. 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 of low temperature supplied from the eddy flow pipe 30 to the ejector 3 is supplied into the high temperature liquid container 1 while sucking the cooling fluid from the cooling fluid supplying pipe 5 and mixed with it, the re-evaporated steam in the high temperature liquid container 1 is heat exchanged with it 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. 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 a vortex pipe is interposed between the compressed air supply pipe and a low-temperature air outlet of the vortex pipe and the mixer. And the outlet of the mixer is communicated with the inside of the high-temperature liquid container.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS By connecting a low-temperature air outlet of a vortex tube to a mixer with a vortex tube interposed in a compressed air supply tube, low-temperature air generated in the vortex tube is supplied to the mixer. As is well known in the art, the vortex tube allows compressed air to flow into the cylindrical vortex tube in a vortex flow, and this rotating air flow creates a pressure-increasing zone near the inner wall of the cylinder.
A depressurized zone is created near the axis, and the intensified air becomes hot due to adiabatic compression, while air in the low pressure zone becomes cold due to adiabatic expansion, and flows out from both ends of the vortex tube to the outside.

The low-temperature air generated in the vortex tube is mixed with a cooling fluid by a mixer attached to the high-temperature liquid container and supplied to the inside of the high-temperature liquid container. In this case, the compressed air reaching the high-temperature liquid container is in an extremely low temperature state due to adiabatic expansion in the vortex tube, and the mixed cooling fluid is also deprived of heat to a low temperature state, and the re-evaporated vapor in the high-temperature liquid container is removed. Can be rapidly cooled and condensed.

[0009] Condensing of the steam proceeds by the rate at which the compressed air adiabatically expands in the vortex tube and cools the cooling fluid, which is greater than the case where only the cooling fluid is supplied and the re-evaporated steam is condensed. Steam can be surely condensed with a small amount of cooling fluid, 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 is further adiabatically expanded during this passage while sucking the cooling fluid, and is supplied to the high-temperature liquid container. Evaporation steam can be condensed to reduce mist.

[0011]

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 cooling fluid supply pipe 5 connected to the ejector 3, a vortex pipe 30 also connected to the ejector 3, a compressed air supply pipe 4 connected to the vortex pipe 30, and liquid pumping by a pump means 6 as a liquid pumping means. Configure the device.

The compressed air supply pipe 4 is connected to a high-pressure compressed air supply source (not shown), is connected to the vortex pipe 30 via a valve 7, and is also connected to the inlet side of the ejector 3 as a mixer via a valve 31. Connecting. The low-temperature air outlet 32 below the vortex tube 30 is connected to the nozzle 8 of the ejector 3 via a valve 33. Hot air outlet 35 at the top of vortex tube 30
Is connected to an outlet pipe 36 to guide hot air to a predetermined location.

A throttle section is built in the nozzle section 8 of the ejector 3 as a mixer, and a suction port 9 is formed in an outer peripheral section thereof.
Is provided. 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 11, injection ports 13, 14 for injecting compressed air or a mixed fluid of the compressed air and the cooling fluid all around the lower part of the diffuser 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 compressed air and 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 for supplying condensed reevaporated vapor and cooling fluid is provided.
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 into the pump means 6 through the check valve 20 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.

In order to reduce the re-evaporated vapor generated in the high-temperature liquid container 1, the low-temperature air generated in the vortex tube 30 is mixed with the cooling fluid from the outlet 32 by the ejector 3 serving as a mixer, and is mixed into the high-temperature liquid container 1. By supplying, the re-evaporated steam is condensed to reduce the mist. That is, the compressed air supplied from the compressed air supply pipe 4 is cooled down by adiabatic expansion in the vortex pipe 30, the flow velocity is increased in the nozzle portion 8 of the ejector 3, a suction force is generated, and the cooling fluid is sucked from the suction port 9. The mixture is supplied to the high-temperature liquid container 1. In this case, the cooling fluid is mixed with the compressed air while being cooled by the low-temperature compressed air. The mixed fluid of the compressed air and the cooling fluid is supplied by the dispersion plate 15 so as to be distributed throughout the high-temperature liquid container 1. 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 pipe 18 at the lower end 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 a single mixer is disposed in the high-temperature liquid container 1, but it depends on 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.

[0022]

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 in the vortex tube, and the re-evaporation steam can be reliably reduced with less cooling fluid. Can be done.

Further, not only the cooling fluid from the mixer,
The compressed air which has been adiabatically expanded and cooled to a low temperature is also supplied in a mixed state, so that 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 pressurized fluid pipe 30 Swirl Pipe 32 Low temperature air outlet 35 High temperature air outlet

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 compressed air supply pipe and a cooling fluid supply pipe are connected to the mixer, and a low temperature air outlet of the swirl pipe and the mixer are connected with a swirl pipe interposed in the compressed air supply pipe, and
A liquid pumping device characterized in that an outlet of the mixer communicates with the inside of the high temperature liquid container.