JPH0958799A - Liquid conveying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To settle a problem that a liquid leaking from an air separator can not be prevented from flowing into a mist tank. SOLUTION: A loading arm 5 connected to a delivery port 4 of a liquid conveying pump 3 of a tanker 1 is in communication with an oil storage tank 7 for storing oil through a liquid conveying pipeline 6. An air separator 8 provided in the pipeline 6 is connected to a mist tank 14 through a mist recovery pipe 12. And a shut-off valve 15 and an oil sensing device 16 for sensing oil leaking from the separator 8 are provided in the pipe 12. When leak of oil is sensed by the device 16, the valve 15 effects a valve closing operation upon valve closing signals from an emergency cutoff control device 17 to prevent oil from flowing into the mist tank 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid feeding device, and more particularly to a liquid feeding device configured to prevent liquid leaking from an air separator from flowing into a mist tank.

[0002]

2. Description of the Related Art A pipeline for delivering oil liquid loaded in a tanker to an oil storage tank at an oil tank has a liquid delivery device for separating air bubbles mixed in the oil liquid and collecting mist generated by the air bubble separation. It is arranged. This liquid delivery device separates air bubbles from the delivered oil liquid and discharges the oil liquid containing no air bubbles to the oil storage tank downstream, and the mist generated in the space above the air separator in the mist recovery pipeline. And a mist tank which collects via the.

In the conventional liquid feeding device, a float valve is provided in the air separator in order to prevent the oil liquid from flowing out to the mist tank when the liquid level in the air separator rises above the upper limit position. This float valve is provided with a valve body for opening and closing the outlet on the float, and when the float rises from the upper limit position due to the rise of the liquid level, the valve body provided on the float is the outlet provided on the upper part of the air separator. Is designed to close. When the liquid level in the air separator drops, the float also drops, so that the outlet of the air separator opens and the mist generated in the upper part of the air separator can be discharged to the mist tank.

[0004]

In the conventional liquid feeding device,
Since only the float valve is provided in the air separator, if the float valve cannot close the outlet of the air separator, the oil liquid leaking from the air separator must flow into the mist tank through the mist recovery pipeline. become. Since the mist tank is usually intended to collect only the mist collected from the air separator, it has a relatively small capacity. Therefore, the work of periodically discharging the oil liquid accumulated in the mist tank from the mist tank is performed.

However, if the oil liquid leaking from the air separator flows into the mist tank before the oil liquid accumulated in the mist tank is drained, the oil liquid exceeding the capacity will flow in, and the oil liquid will flow from the mist tank. Could overflow. Therefore, conventionally, in order to prevent the overflow from the mist tank, the amount of oil liquid accumulated in the mist tank must be frequently checked, which is a troublesome problem.

[0006] Therefore, an object of the present invention is to provide a liquid feeding device that solves the above problems.

[0007]

In order to solve the above problems, the present invention has the following features. The invention of claim 1 has an air separator for separating air bubbles mixed in the liquid sent through the liquid sending pipe line, and the mist generated by the air bubble separation taken out from the air separator is stored in a mist tank. In the liquid sending device for collecting, a liquid detecting means for detecting a liquid leaking from the air separator is provided in a pipe line connecting the air separator and the mist tank.

Therefore, according to the first aspect of the present invention, since the liquid leaking from the air separator can be detected by the liquid detecting means provided in the conduit connecting the air separator and the mist tank, the liquid leaking from the air separator can be detected. It is possible to prevent the liquid from flowing into the mist tank.

Further, in the invention of claim 2, the liquid detecting means is
A container arranged in a conduit communicating the air separator and the mist tank, an inflow port provided in the lower part of the container, an outflow port provided in the upper part of the container, and a lower part of the container. It is characterized by comprising a liquid detection sensor provided.

Therefore, according to the second aspect, since the inflow port of the liquid detecting means is located at a position lower than the outflow port, the liquid detecting sensor detects the liquid leaked from the air separator before flowing out from the outflow port to the mist tank. It is possible to detect that the liquid has leaked from the air separator, and it is possible to prevent the liquid that has leaked from the air separator from flowing into the mist tank.

Further, the invention according to claim 3 is the liquid sending device according to claim 1, characterized in that a shutoff valve is provided for shutting off the pipeline when the liquid detecting means detects the liquid. To do. Therefore, according to the third aspect, since the shutoff valve that shuts off the conduit that connects the air separator and the mist tank is provided when the liquid detection means detects the liquid, the shutoff valve is provided when the liquid leaks from the air separator. It is possible to reliably prevent the liquid leaking from the air separator by blocking the pipe from flowing into the mist tank.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a liquid delivery device according to the present invention will be described below with reference to the drawings. 1 is a configuration diagram showing a liquid delivery pipeline to which an embodiment of the liquid delivery device of the present invention is applied, and FIG. 2 is a longitudinal sectional view of a first embodiment of the liquid detection device,
FIG. 3 is a cross-sectional view of the first embodiment of the liquid detecting device taken along line III-III in FIG.

A loading arm 5 connected to a discharge port 4 of a liquid feed pump 3 of the tanker 1 is provided on a quay 2 on which the tanker 1 is docked. The loading arm 5 is in communication with an oil storage tank 7 that stores the oil liquid unloaded from the tanker 1 via a liquid delivery pipeline 6. The oil storage tank 7 is a tank for supplying oil liquid to a power generation boiler of a thermal power plant.

The liquid delivery pipeline 6 is provided with an air separator 8 for separating and removing air bubbles mixed in the oil liquid, a strainer 9 for removing foreign matters contained in the oil liquid passing through the air separator 8, and a strainer 9. Each device such as a flow meter 10 for measuring the flow rate of the oil liquid that has passed is provided.

The air separator 8 is set such that the internal volume of the container 11 is sufficiently larger than the flow rate of the oil liquid, and the oil liquid supplied via the loading arm 5 passes through the container 11. Bubbles contained in the oil liquid between the container 11
The bubbles are floated in the space above and the air bubbles are separated. Then, the oil liquid containing no bubbles is taken out from the bottom of the container 11 and supplied to the strainer 9.

In the upper space of the container 11, the volatilized oil liquid particles are in a mist state. And container 11
At the top of the mist, there is a mist collection line 1 for collecting mist.
2 is connected. Inside the container 11, a float valve 1 for opening and closing a connection port to which a mist recovery pipeline 12 is connected
3 are provided.

The float valve 13 is provided so as to move up and down according to the fluctuation of the liquid level in the container 11, and when the liquid level exceeds the upper limit position, the connection port of the mist recovery pipeline 12 is closed to close the oil liquid. Are prevented from flowing out to the mist recovery pipeline 12.
Further, when the liquid level is lower than the upper limit position, the position of the float valve 13 is also lowered, so that the connection port of the mist collecting pipe line 12 is opened and the mist in the container 11 becomes mist collecting pipe line 1.
Runs out to 2.

The end of the mist collecting pipe 12 is connected to a mist tank 14 for storing mist. The mist tank 14 is configured to store mist and liquefy the mist collected from the air separator 8. A shutoff valve 15 and an oil liquid detection device (liquid detection means) 16 that detects leakage of oil liquid from the air separator 8 are provided in the mist recovery conduit 12 that connects the air separator 8 and the mist tank 14. It is arranged. The shut-off valve 15 is an electromagnetic valve and is normally kept open. When the leakage of the oil liquid is detected by the oil liquid detection device 16, the shutoff valve 15 is used as the emergency shutoff control device 1.
The valve closing operation is performed by the valve closing signal from 7.

A drain line 18 is connected to the bottom of the mist tank 14. A manual drain valve 19 that is periodically opened is provided in the drain conduit 18. Then, when the drain valve 19 is opened, the oil liquid stored in the bottom of the mist tank 14 passes through the drain conduit 18 and is discharged to the drain tank 20.

Here, the structure of the oil liquid detection device 16 will be described. As shown in FIG. 2, the oil liquid detection device 16 has an inflow port 22 at the bottom of a cylindrical container 21.
Has an outlet 23 at the upper part of. The inlet 22 is the shutoff valve 15
Is communicated with the air separator 8, and the outflow port 23 is communicated with the mist tank 14.

At the position opposite to the inflow port 22, the inflow port 2
A guide plate 24 for guiding the flow of the oil liquid flowing in from 2 is provided. The guide plate 24 is used for the inflow port 2
Since it is provided so as to face 2, the upper end is located lower than the outflow port 23, and the lower end is located apart from the bottom of the container 20.

The guide plate 24, when viewed from above,
As shown in FIG. 3, the oil liquid, which is curved in an arc shape, collides with the front surface 24 a of the guide plate 24 and is guided downward to reach the lower end of the guide plate 21 and the bottom of the container 18. To the gap 25 between them.

A liquid level sensor 26 for detecting the oil liquid is provided at a position facing the rear surface 24b of the guide plate 24. The liquid level sensor 26 includes a float 27 and a level switch 28 that detects the oil liquid by the upward movement of the float 27. The float 27 is inserted inside the sensor mounting portion 29, and the level switch 28 is provided outside the lid 30 that closes the sensor mounting portion 29.

Normally, the mist collected from the air separator 8 flows into the inflow port 22. In this way, the float 24 does not move upward even if the mist flows into the container 21, so that the level switch 28 remains off. Therefore, the mist recovered via the mist recovery conduit 12 is
It is supplied to the mist tank 14 through the cutoff valve 15 and the oil liquid detection device 16.

However, if the float valve 13 of the air separator 8 fails and leakage from the air separator 8 cannot be prevented, when the liquid level in the air separator 8 rises, the oil liquid will become mist recovery conduit. May flow into 12. In that case, the oil liquid leaked from the air separator 8 passes through the shutoff valve 15 and flows into the container 21 of the oil liquid detection device 16.

Then, from the mist collecting line 12 to the container 21.
The oil liquid flowing into the inflow port 22 is guided to the guide plate 24 in the container 18 and reaches the lower end of the guide plate 24 and the bottom of the container 18. Furthermore, as the oil liquid flows into the container 21, the liquid surface gradually rises. Therefore, the float 27 of the liquid level sensor 26 provided in the lower portion of the container 22 moves upward and the level switch 28 is switched on. That is, the level switch 28 detects the inflow of the oil liquid by the upward movement of the float 27 and outputs the detection signal to the control device 17.

Therefore, the controller 17 outputs a valve closing signal to the shutoff valve 15 to close the shutoff valve 15. Therefore,
The shutoff valve 15 is closed to shut off the mist recovery conduit 12. This prevents the oil liquid leaking from the air separator 8 from flowing into the mist tank 14, and the mist tank 14 can be prevented from overflowing the oil liquid. Therefore, it is not necessary to frequently check the amount of oil liquid stored in the mist tank 14, and the maintenance work is simplified as compared with the conventional one.

The oil liquid leaked from the air separator 8 flows into the oil liquid detecting device 16 even after the liquid level sensor 26 detects the inflow of the oil liquid and before the shutoff valve 15 is closed. . However, the volume of the container 21 is set to a size that can accommodate the oil liquid that has flowed in during the operation time until the shutoff valve 15 closes. That is, since the outflow port 23 is provided in the upper part of the container 21, the liquid level sensor 26 provided in the lower part of the container 21 shuts off after the oil liquid is detected until the liquid surface of the oil liquid reaches the outflow port 23. If the valve 15 is closed, the oil liquid can be prevented from flowing out from the oil liquid detection device 16.

Further, since the shut-off valve 15 is closed as described above, the oil liquid leaked to the mist recovery conduit 12 can be reduced, and the work for removing the oil liquid leaked from the air separator 8 becomes easy. Thus, the oil liquid removal work can be completed in a short time. FIG. 4 shows an oil liquid detection device 31 of the second embodiment.
Is shown.

In this oil liquid detecting device 31, the inflow port 22 is provided in the upper part of the container 21 like the outflow port 23,
A guide plate 24 extends to the top of the container 21. Therefore, when the float valve 13 of the air separator 8 breaks down and the oil liquid flows from the inflow port 22, the oil liquid flows into the guide plate 24.
Of the right chamber 21b defined by the rear surface 24b of the guide plate 24 after passing through the gap 25 between the lower end of the guide plate 24 and the bottom of the container 21 after flowing into the left chamber 21a defined by the front surface 24a of the guide plate 24. And is detected by the liquid level sensor 26.

Then, the oil liquid flowing into the container 21 through the inflow port 22 flows out from the rear outflow port 23 filled in the left chamber 21a and the right chamber 21b, so that the volume of the entire container 21 is effective. Can be used for Accordingly, the time from when the liquid level sensor 26 detects the inflow of the oil liquid to when the shutoff valve 15 is closed can be increased.

In the above embodiment, the oil liquid detecting device 16,
31 provides the guide plate 24 in the container 21 and the container 2
The configuration is such that the float type liquid level sensor 26 is provided in the lower part of 1. However, the present invention is not limited to this. For example, instead of the float type liquid level sensor 26, another type of sensor (eg, an ultrasonic sensor, an optical sensor, etc. ) May be used to detect the liquid level in the container 21.

Further, it goes without saying that the container 21 may be eliminated and an oil liquid detection sensor may be provided in the mist recovery pipe line 12 so that the oil liquid can be detected in the mist recovery pipe line 12. Further, in the above-described embodiment, the shutoff valve 15 is provided in the mist recovery pipeline 12, and when the oil level detection signal is output from the liquid level sensor 26, the shutoff valve 15 is closed to close the mist tank 14.
Although the oil liquid is prevented from flowing into the device, for example, when an oil liquid detection signal is output from the liquid level sensor 26, an operator may be informed of the oil liquid leakage by an alarm or display. Then, after the operator knows that the oil liquid has leaked from the air separator 8 by an alarm or display, the shutoff valve 15 is manually closed or the drain valve 19 is opened to operate the mist tank. 14
Can be prevented.

Further, in the above embodiment, the liquid feeding pipeline for feeding the oil liquid has been described as an example, but the present invention is not limited to this, and is also applied to a liquid feeding device for feeding a liquid other than the oil liquid. Of course you can.

[0035]

As described above, according to the first aspect, the liquid leaking from the air separator can be detected by the liquid detecting means provided in the conduit connecting the air separator and the mist tank. It is possible to prevent the liquid leaked from the air separator from flowing into the mist tank. Therefore, it is not necessary to frequently check the amount of liquid stored in the mist tank, and the maintenance work can be simplified as compared with the conventional one.

Further, according to the second aspect, since the inflow port of the liquid detecting means is located at a position lower than the outflow port, the liquid detecting sensor detects the liquid leaked from the air separator before flowing out from the outflow port to the mist tank. It is possible to detect that the liquid has leaked from the air separator, and it is possible to prevent the liquid that has leaked from the air separator from flowing into the mist tank.

Further, according to the third aspect, since the shutoff valve is provided for shutting off the conduit connecting the air separator and the mist tank when the liquid detecting means detects the liquid, when the liquid leaks from the air separator, It is possible to reliably prevent the liquid leaked from the air separator from flowing into the mist tank due to the shutoff valve shutting off the pipeline. Therefore, the amount of liquid leaked from the air separator can be reduced, and the work for removing the leaked liquid can be easily performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a liquid delivery pipeline to which an embodiment of a liquid delivery device according to the present invention is applied.

FIG. 2 is a vertical cross-sectional view of the first embodiment of the liquid detection device.

FIG. 3 is a transverse sectional view of the first embodiment of the liquid detection device taken along the line III-III in FIG.

FIG. 4 is a vertical sectional view of a second embodiment of the liquid detection device.

[Explanation of symbols]

 1 Tanker 3 Liquid Delivery Pump 5 Loading Arm 6 Liquid Delivery Pipeline 7 Oil Storage Tank 8 Air Separator 9 Strainer 10 Flowmeter 13 Float Valve 14 Mist Tank 15 Shutoff Valve 16, 31 Oil Liquid Detector 19 Drain Valve 21 Container 24 Guide Plate 26 Liquid level sensor

Claims (3)

[Claims] 1. An air separator having an air separator for separating air bubbles mixed in a liquid sent through a liquid sending pipe, and collecting mist generated by the air bubble separation taken out from the air separator into a mist tank. In the liquid device, a liquid detecting device for detecting a liquid leaking from the air separator is provided in a pipe line connecting the air separator and the mist tank. 2. The liquid detecting means is provided in a container arranged in a pipe line communicating the air separator and the mist tank, an inflow port provided in a lower part of the container, and an upper part of the container. The liquid delivery device according to claim 1, comprising a provided outlet and a liquid detection sensor provided in a lower portion of the container. 3. The liquid delivery device according to claim 1, further comprising a shutoff valve that shuts off the conduit when the liquid detection means detects the liquid.