JP3895420B2 - Liquid pumping device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid pumping device that pumps a liquid such as fuel or water, and more particularly to a device that reduces re-evaporated vapor generated when pumping a high-temperature liquid. The liquid pumping device of the present invention is particularly suitable as a device that once collects condensate as condensed water of steam generated in the steam system and pumps this condensate, which is a high-temperature liquid, to a boiler or exhaust heat utilization device. is there.
[0002]
[Prior art]
As a conventional liquid pumping apparatus of this type, for example, there is one disclosed in Japanese Patent Laid-Open No. 7-139705. In this system, a steam ejector, a condensate tank, and a fluid pressure-feed pump means are connected in sequence to the secondary side of the steam using device. The steam ejector condensates the high-temperature liquid generated in 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 place such as a boiler by a pump means.
[0003]
[Problems to be solved by the invention]
In the conventional liquid pumping device, there is a problem that a large amount of re-evaporated vapor is generated in a condensate tank that stores condensate as a high-temperature liquid, and the environmental conditions deteriorate due to trapping in the vicinity of the tank.
[0004]
In addition, there has been a problem that a large amount of cooling water is required to reduce the re-evaporated vapor to such an extent that the re-evaporated vapor that can be trapped with the water is reliably condensed and the deterioration of the environment is prevented.
[0005]
Therefore, the technical problem of the present invention is to obtain a liquid pumping device that can reduce re-evaporated vapor without requiring a large amount of cooling fluid.
[0006]
[Means for Solving the Problems]
The means taken in order to solve the above-mentioned problem is that a high-temperature liquid is stored in a container and pumped to a predetermined location, and a mixer for mixing at least two kinds of fluids is attached to a high-temperature liquid container that stores the high-temperature liquid. The mixer is formed of an ejector with a built-in nozzle, a compressed air supply pipe is connected to the nozzle , a cooling fluid supply pipe is connected to the suction port of the ejector , and the outlet of the mixer communicates with the inside of the high-temperature liquid container. At the same time, a liquid pumping means is connected to the high temperature liquid container via a pipe .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
By connecting the compressed air supply pipe and the cooling fluid supply pipe to the mixer attached to the high temperature liquid container, the compressed air and the cooling fluid are mixed in the mixer and supplied from the outlet to the inside of the high temperature liquid container. . In this case, the compressed air reaching the high temperature liquid container is adiabatically expanded as the pressure decreases from the high pressure state before supply to the low pressure state in the container. The cooling fluid mixed by this adiabatic expansion is deprived of heat and becomes a low temperature state, and the re-evaporated vapor in the high temperature liquid container can be rapidly cooled and condensed.
[0008]
Vapor condensation progresses 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 vapor is condensed, the vapor is reduced with less cooling fluid. Can be reliably condensed, and the re-vaporized steam that can be trapped in the dullness can be reduced.
[0009]
As the mixer for mixing the compressed air and the cooling fluid, for example, an ejector with a built-in nozzle can be used. That is, a compressed air supply pipe is connected to the nozzle, a cooling fluid supply pipe is connected to the suction port of the ejector, and the outlet of the ejector is communicated with the inside of the high-temperature liquid container so that the compressed air passing through the nozzle is cooled. Adiabatic expansion is performed while sucking the fluid, and the liquid is supplied to the high-temperature liquid container, and the re-evaporated vapor in the container is condensed to reduce smokyness.
[0010]
【Example】
In FIG. 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, an ejector 3 as a mixer attached to the high temperature liquid container 1, and an ejector 3 are connected. The compressed air supply pipe 4, the cooling fluid supply pipe 5, and the pump means 6 as the liquid pressure feeding means constitute a liquid pressure feeding device.
[0011]
The compressed air supply pipe 4 is connected to a high pressure compressed air supply source (not shown), and is connected to a nozzle portion 8 of the ejector 3 as a mixer via a valve 7. The nozzle portion 8 includes a throttle portion, and a suction port 9 is provided on the outer peripheral portion thereof. A cooling fluid supply pipe 5 is connected to the suction port 9 via a valve 10.
[0012]
A diffuser portion 11 is provided below the nozzle portion 8 and attached to the upper opening 12 of the high temperature liquid container 1. At the lower part of the diffuser part 11, there are attached injection ports 13 and 14 for injecting compressed air or a mixed fluid of compressed air and a cooling fluid to the entire lower periphery of the diffuser part 11. The compressed air or the mixed fluid ejected from the ejection ports 13 and 14 prevents the re-evaporated vapor in the high-temperature liquid container 1 from being discharged from the opening 12 to the outside, and the re-evaporated vapor is below the diffuser unit 11. It is for collecting and promoting condensation. A dispersion plate 15 that disperses the mixed fluid of compressed air and cooling fluid over almost the entire interior of the high-temperature liquid container 1 is attached below the diffuser portion 11 and above the high-temperature liquid container 1. The dispersion plate 15 has a substantially conical shape and is provided with a plurality of communication holes 16.
[0013]
The condensate supply pipe 2 is connected to an outlet side of a steam using device (not shown), a re-evaporation tank or the like via a steam trap 17 and supplies condensate as a high temperature liquid into the high temperature liquid container 1. The condensate that has reached the hot liquid container 1 re-evaporates in the container 1.
[0014]
A pipe 18 is connected to the lower end of the high-temperature liquid container 1 via a valve 19 and a check valve 20 for allowing the condensed reevaporated vapor and the cooling fluid to flow down to the pump means 6 as the liquid pumping means. The check valve 20 allows only the flow of fluid from the high-temperature liquid container 1 to the pump means 6 and blocks the passage of the opposite fluid.
[0015]
The pump means 6 flows down from the pipe 18 and also pumps the liquid from a pipe 22 provided with a check valve 21 to a predetermined location. The pipe 22 branches halfway and is connected to the cooling fluid supply pipe 5. Connecting. A high pressure pumping fluid pipe 24 for supplying a high pressure pumping fluid is connected to the pump means 6 via a valve 23, and a discharge pipe 25 for discharging the high pressure pumping fluid after pumping to the outside is connected via a valve 26. Connecting. The compressed air supply pipe 4 can be branched and connected to the high-pressure pumping fluid pipe 24.
[0016]
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 liquid level detection mechanism provided inside works to operate the inside of the pump means 6 and the high-pressure pumping fluid pipe 24. , The discharge pipe 25 is shut off, and the liquid accumulated in the pump means 6 is pumped from the pipe 22 to a predetermined position via the check valve 21 by the fluid from the high pressure pumping fluid pipe 24. It is.
[0017]
When reducing the re-evaporated vapor generated in the high-temperature liquid container 1, the re-evaporated vapor is condensed by mixing the compressed air and the cooling fluid with the ejector 3 serving as a mixer and supplying the mixture into the high-temperature liquid container 1. Reduces dullness. That is, the compressed air supplied from the compressed air supply pipe 4 is squeezed by the nozzle portion 8 of the ejector 3 to increase the flow velocity and generate a suction force, and the cooling fluid is sucked and mixed from the suction port 9 to be mixed. Supplied in. In this case, the cooling fluid is cooled and mixed with the compressed air by the adiabatic expansion of the compressed air. A mixed fluid of compressed air and cooling fluid is supplied by the dispersion plate 15 so as to spread throughout the high-temperature liquid container 1. The supplied mixed fluid exchanges heat with the re-evaporated vapor filled in the high-temperature liquid container 1, condenses the re-evaporated vapor and flows down from the lower end pipe 18 to the pump means 6.
[0018]
The liquid accumulated by flowing down to the pump means 6 is pumped from the pipe 22 to a predetermined location as described above. In the present embodiment, by connecting the cooling fluid supply pipe 5 and the pipe 22, a part of the pumped liquid from the pump means 6 can be used as the cooling fluid supplied to the high temperature liquid container 1.
[0019]
In the present embodiment, an example in which the ejector 3 as one mixer is disposed in the high-temperature liquid container 1 has been shown. However, the ejector 3 of the ejector 3 depends on the size of the high-temperature liquid container 1 and the amount of reevaporated vapor to be condensed. The number is not limited to one, and a plurality of two or more can be arranged.
[0020]
【The invention's effect】
According to the present invention, the cooling fluid can be supplied into the high-temperature liquid container in a low temperature state by adiabatic expansion of the compressed air, and the re-evaporated vapor can be reliably reduced with less cooling fluid.
[0021]
Further, not only the cooling fluid but also the compressed air which has been adiabatically expanded and lowered in temperature are mixed and supplied from the mixer, and the vapor in the high-temperature liquid container can be further condensed and reduced.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional configuration diagram showing an embodiment of a liquid pumping apparatus 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, 21 Check valve 24 High pressure pumping fluid pipe

Claims (1)

In a high temperature liquid that is stored in a container and pumped to a predetermined location, a mixer that mixes at least two kinds of fluids is attached to a high temperature liquid container that stores the high temperature liquid, and the mixer is formed by an ejector with a built-in nozzle. A compressed air supply pipe is connected to the nozzle, a cooling fluid supply pipe is connected to the suction port of the ejector , and the outlet of the mixer communicates with the inside of the high-temperature liquid container. A liquid pumping apparatus characterized by connecting means .

Images