JP3895423B2 - 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 pump means are sequentially connected to the secondary side of the steam using device. Condensate as a high-temperature liquid generated in the steam using device is sucked by the steam ejector and recovered. The water is stored in a water tank, and the condensate in the condensate tank is pumped to a predetermined location 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 reliably condense the re-evaporated steam that can be trapped with the mist and reduce the re-evaporated steam to the extent that the environmental deterioration 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. A cooling fluid supply pipe is connected to a high-temperature liquid container for storing the high-temperature liquid, and the cooling fluid supply Connect the ejector to the pipe and attach the ejector in the high-temperature liquid container , open the suction part of the ejector above the high-temperature liquid container , and connect the indirect heat exchange part to the outlet side of the ejector in the high-temperature liquid container. And a liquid pumping means is connected to the high-temperature liquid container via a pipe .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
By supplying the cooling fluid from the cooling fluid supply pipe to the ejector, a suction force is generated in the suction portion of the ejector to suck the re-evaporated vapor generated in the high temperature liquid container. The sucked re-evaporated vapor is mixed with the cooling fluid in the ejector and supplied to an indirect heat exchanging unit connected to the outlet side. The indirect heat exchanging unit further heats the re-evaporated vapor in the high-temperature liquid container. Replace and condense. Therefore, compared with the case where only the cooling fluid is supplied and the re-evaporated vapor is condensed, the vapor can be reliably condensed with less cooling fluid, and the re-evaporated vapor that can be trapped with the smoky is reduced. it can.
[0008]
【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 attached in the high-temperature liquid container 1, and a cooling fluid connected to the ejector 3 A liquid pumping device is configured by the supply pipe 4, the indirect heat exchanging unit 5 provided continuously on the outlet side of the ejector 3, and the pump unit 6 as the liquid pumping unit.
[0009]
The cooling fluid supply pipe 4 is connected to a cooling fluid source such as cooling water (not shown) and is connected to the nozzle portion 8 of the ejector 3 via the valve 7. Inside the nozzle portion 8, a throttle portion is built in and a suction port 9 as a suction portion is provided. The upper end portion of the suction port 9 is opened to communicate with the upper portion in the high temperature liquid container 1. A diffuser unit 10 is provided on the right side of the nozzle unit 8, and a coiled indirect heat exchange unit 5 is connected to the right side of the diffuser unit 10.
[0010]
The indirect heat exchanging unit 5 is arranged so as to reach the entirety of the high-temperature liquid container 1 using a material having high thermal conductivity such as a copper tube, and the lower part thereof is connected to the cooling fluid discharge pipe 12 via the valve 11. To do. The cooling fluid discharge pipe 12 guides the cooling fluid whose temperature has increased by exchanging heat with the re-evaporated vapor in the high-temperature liquid container 1 by the ejector 3 and the indirect heat exchanging unit 5 to a separate use location.
[0011]
An open air pipe 14 is attached to the upper part of the high-temperature liquid container 1 through a valve 13. By opening the valve 13, the inside of the high-temperature liquid container 1 communicates with the atmosphere, and can be shut off by closing the valve. A gas vent valve 16 is attached via the valve 15. The gas vent valve 16 automatically removes non-condensable gas such as air accumulated in the upper portion of the high-temperature liquid container 1 to the outside. Although not shown, the gas vent valve 16 uses a thermal element such as bimetal or thermowax. When the ambient temperature is lower than the predetermined temperature, for example, 80 degrees C or lower, the valve is automatically opened to remove the gas, and when the ambient temperature is higher than the predetermined temperature, the valve is closed to prevent leakage of steam to the outside. is there.
[0012]
The condensate supply pipe 2 for supplying the high-temperature liquid is connected to the outlet side of a vapor using apparatus (not shown), a re-evaporation tank or the like via a steam trap 17 to supply 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.
[0013]
At the lower end of the high-temperature liquid container 1, a pipe 18 for allowing the condensate that has not re-evaporated and the condensed re-evaporated vapor to flow to the pump means 6 as the liquid pumping means is connected via a valve 19 and a check valve 20. Connecting. 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.
[0014]
The pump means 6 flows down the liquid from the pipe 18 and pumps the liquid from a pipe 22 provided with a check valve 21 to a predetermined location. The pump means 6 is connected to a high-pressure pumping fluid pipe 24 for supplying compressed air as a high-pressure pumping fluid via a valve 23, and a discharge pipe 25 for discharging the high-pressure pumping fluid after pumping to the outside. 26 to connect.
[0015]
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 location via the check valve 21 by the high pressure fluid from the high pressure pumping fluid pipe 24. Is.
[0016]
When reducing the re-evaporated vapor generated in the high-temperature liquid container 1, the cooling fluid is supplied from the cooling water supply pipe 4 to the ejector 3, so that the cooling fluid is throttled in the nozzle portion 8 of the ejector 3 and the flow velocity is reduced. Further, a suction force is generated, and part of the reevaporated vapor in the high-temperature liquid container 1 is sucked and mixed from the suction port 9, and reaches the indirect heat exchange unit 5. Therefore, the re-evaporated vapor existing above the high-temperature liquid container 1 is sucked from the suction port 9, and the re-evaporated vapor existing below is condensed by the indirect heat exchange unit 5. The condensed re-evaporated vapor and the high-temperature liquid that has not been re-evaporated flow down from the pipe 18 at the lower end of the high-temperature liquid container 1 to the pump means 6 through the check valve 20.
[0017]
The liquid accumulated by flowing down to the pump means 6 is pumped from the pipe 22 to a predetermined location as described above.
[0018]
In the present embodiment, an example in which one ejector 3 is disposed in the high-temperature liquid container 1 is shown. However, the number of ejectors 3 is one according to the size of the high-temperature liquid container 1 and the amount of reevaporated vapor to be condensed. There is no limitation, and a plurality of two or more units can be arranged.
[0019]
【The invention's effect】
According to the present invention, the suction part of the ejector connected to the cooling fluid supply pipe is opened in the high-temperature liquid container, and the indirect heat exchange part is continuously provided on the outlet side of the ejector, thereby generating in the high-temperature liquid container. A part of the re-evaporated vapor can be sucked by the suction part of the ejector to accelerate the condensation of the re-evaporated vapor, and the re-evaporated vapor can be reliably reduced with less cooling fluid.
[0020]
In addition, the re-evaporated steam is sucked into the suction part of the ejector, so that the convection of the steam in the high-temperature liquid container is promoted, and the heat exchange efficiency in the indirect heat exchange part connected to the outlet side of the ejector is improved. Furthermore, the re-evaporated vapor can be reliably condensed.
[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 Cooling fluid supply pipe 5 Indirect heat exchange part 6 Pump means 9 Suction port 20, 21 Check valve 24 High pressure pumping fluid pipe

Claims (1)

In a high temperature liquid stored in a container and pumped to a predetermined location, a cooling fluid supply pipe is connected to the high temperature liquid container in which the high temperature liquid is stored, and an ejector is connected to the cooling fluid supply pipe and the ejector is connected to the high temperature liquid container. mounted within the suction portion of the ejector is opened upward in the hot liquid container, while continuously provided indirect heat exchange section on the outlet side of the ejector in a hot liquid container, via a tube to a high temperature liquid container liquid A liquid pumping apparatus characterized by connecting pumping means .

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