JPH024691A - Moisture removing device for oil tank - Google Patents

Abstract

PURPOSE:To automatically control the discharge water while an interfacial level is always kept constant by providing a control apparatus for controlling the opening and closing of an opening and closing control valve by the detection signal of an interface meter. CONSTITUTION:Since the specific gravity of a float 17 has the neutral point between the specific gravity of oil 9 and that of water 10, the float 17 is always positioned at an interfacial level and, therefore, when the amount of water 10 increases and the position of the float 17 rises, a position detector 23 detects this state and, when the detection signal from the position detector 23 exceeds a set value 27, a control apparatus 28 emits an order to a valve driver 29 to open an opening and closing control valve 25 and, by this mechanism, the water 10 in an oil tank 1 is automatically discharged through a drain pipe 24. The water level in the oil tank 1 is lowered by drainage and, when the detection signal from a the position detector 23 reaches the set value 27 or less, the opening and closing control valve 25 is automatically closed to stop drainage.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a water removal device for an oil tank.

[Prior Art] Seawater and rainwater from inside the tanker enters the oil tank and accumulates at the bottom of the tank. For this reason, it has been conventional practice to drain water that has accumulated at the bottom of the tank.

Fig. 5 shows an example of a conventional system, in which a plurality of take-out pipes 3.4.5 are provided in the vertical direction at the bottom of the side plate 2 of the oil tank 1, and a valve is provided on the take-out pipe 3.4.5. 6. Open the 7.8 sequentially and find out the approximate position of the interface level 11 between oil 9 and water 1O in the oil tank 1 depending on whether it is oil or water that flows out, and then remove the lowest stage. Drainage is performed via a drain pipe 12 connected to the pipe 5. 13 in the diagram
indicates a floating roof.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional method, the operation for determining the level 11 of the water 10 stagnant at the bottom of the oil tank 1 and the operation for determining the amount of water to be drained are extremely complicated. It is troublesome and the level 11 of the water 10 staying at the bottom of the oil tank cannot be accurately determined, so when the water level 11 is high, water may be supplied together with the fuel oil, or the water level 11 may be too high. When the water was low, there were problems such as oil leaking out together with the waste water.

The present invention provides a water removal device for an oil tank that can accurately detect the level of water stagnant at the bottom of the tank and automatically adjust the discharge of water so as to keep the interface level constant. It is an object.

[Means for Solving the Problems] The present invention provides an oil tank with an interface meter that detects the level of the interface between oil and water in the oil tank, and connects a drain pipe that opens near the bottom of the oil tank to the oil tank. An apparatus for removing moisture from an oil tank, characterized in that an opening/closing control valve is provided in the middle of the oil tank leading out to the outside, and a control device is provided for controlling opening/closing of the opening/closing control valve based on a detection signal from the interface meter. be.

[Function] When the amount of water remaining in the oil tank increases and the interface level rises, this is detected by the interface meter, and the control device controls the opening/closing of the on-off control valve based on the detection signal of the interface meter, and controls the opening and closing of the opening/closing control valve. Automatically drains water.

[Example〕 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows one embodiment of the present invention, and the parts in the figure with the same reference numerals as in FIG. 5 represent the same parts.

In the embodiment shown in FIG. 1, oil 9 and water l are placed on the bottom plate 14 of the tank l.
A pedestal 15 having a height higher than the highest position of the assumed interface level U of O is fixed, and the upper end of the pedestal 15 and the bottom plate 14 are fixed.
A vertical guide cable 16 is provided between the guide cable 1B and a float 17 that moves up and down along the guide cable 1B.

fixing the lower end of the guide tube 18 on the upper end of the pedestal 15;
The upper end of the guide tube 18 passes through the floating roof 13 and is supported by a fixing member 19 provided at the top of the oil tank 1.

A detector (for example, a piano wire) 20 whose one end is fixed to the float 17 is guided to the upper part through the inside of the guide tube 18, and then guided along the outside of the side plate 2 via guide pulleys 21 and 22 provided at the top of the oil tank 1. and connect it to a position detector 23 fixed to the side plate 2. The position detector 23 is
The detector 20 is wound up with a slight tension always applied to the detector 20, and the position of the float 17, that is, the interface level 11 can be detected by the amount of winding.

At this time, the float 17 has a specific gravity that is at the neutral point of the specific gravity of the oil 9 and the water 1O, and is greater than that point by the amount of the tension load applied to the detector 20.

The side plate 2 has a drain pipe 24 that opens near the bottom plate 14.
is provided, and an on-off control valve 2 is provided in the middle of the drain pipe 24.
5 is provided. 2B is the main valve.

The detection signal of the position detector 23 is input to the control device 28 into which the level set value 27 is input, and the control signal from the control device 28 drives the valve drive device 2, such as an electric type or a pneumatic type.
The opening/closing of the opening/closing control valve 25 is controlled via the opening/closing control valve 9.

In the above, the position detector 23 may be installed on the fixing member 29 or the like.

In the embodiment shown in FIG. 1 above, the specific gravity of the float 17 is
Since there exists a neutral point of the specific gravity of water 1O and
7 is always located at the interfacial level ll, therefore water 1
When the amount of zero increases and the position of the float 17 rises, the position detector 23 detects this, and when the detection signal from the position detector 23 exceeds the set value 27, the control device 28 activates the valve drive device 29. Issue a command to open the on-off control valve 25,
As a result, the water in the oil tank 1 is automatically drained to the drain pipe 24.
drained through.

When the water level in the oil tank 1 decreases due to drainage, and the detection signal from the position detector 23 becomes less than the set value 27, the open/close control valve 25 is automatically closed and the drainage is stopped.

In the above embodiment, control may be performed by giving a range to the set value so that the opening/closing control valve 25 is not opened or closed due to slight fluctuations in the interface level 11.

FIG. 2 shows another embodiment of the present invention, in which, instead of the float type interface meter, a capacitance type interface meter is used so that the detection part 30 diagonally penetrates the interface level 11 between oil 9 and water 1O. A case is shown in which a capacitive interface meter is provided in which an interface detector 31 is fixed through the side plate 2, and a detection signal from the interface detector 31 is inputted to the controller 28.

FIG. 3.4 shows details of the mounting part of the interface detector 31, in which an opening 32 such as a circular or elliptical shape is formed in the side plate 2, and a mounting plate 33 of a shape matching the opening 32 is formed. The mounting hole 3 is provided with a required inclination angle α on the mounting plate 33.
4 is opened, and the interface detector 31 is removably attached to the attachment hole 34 via a screw 35. After aligning the mounting plate 33 formed as described above with the opening 32 of the side plate 2,
and the mounting plate 33 are fixed airtightly by welding. In this way, the interface detector 3I can be easily attached to the side plate 2, and the interface detector 31 can be inspected and
It is also possible to facilitate work such as replacement.

Even when using the capacitance type interface meter, the interface level 11 is automatically detected and the interface level 11 is always kept at a constant height, as in the case of using the float type interface meter. Drainage can be automatically controlled.

It should be noted that the oil tank water removal device of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes may be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the oil tank water removal device of the present invention, the interface level between oil and water in the oil tank is detected by an interface meter, and the opening/closing control is performed based on the detection signal of the interface meter. Since the valve is automatically opened and closed to drain water, an excellent effect can be achieved in that the interface level can always be maintained at a constant level without the need for troublesome operations.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of one embodiment of the present invention, Fig. 2 is an explanatory diagram of another embodiment of the invention, Fig. 3 is a detailed explanatory diagram showing a part of Fig. 2 enlarged; 4 is a view taken along the line IV-IV in FIG. 3, and FIG. 5 is an explanatory diagram showing an example of the conventional system. ■ is an oil tank, 2 is a steel plate, lI is an interface level, 17 is a float, 2o is a detector, 23 is a position detector, 24 is a drain pipe, 25 is an on-off control valve, 28 is a control device, 29 is a valve drive device , 31 is an interface detector, and 33 is a mounting plate. Figure 2

Claims (1)

[Claims] 1) The oil tank is equipped with an interface meter that detects the interface level of oil and water in the oil tank, and a drain pipe that opens near the bottom of the oil tank is led out of the oil tank, and an opening/closing control is performed along the way. A water removal device for an oil tank, characterized in that a valve is provided, and a control device is provided for controlling opening and closing of the opening/closing control valve based on a detection signal from the interface meter.