JP2000258222A - Liquid level detecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid level detecting method capable of easily and accurately detecting the levels of two types of liquids or more which separate into upper and lower layers and the location of their liquid interface. SOLUTION: Two types of mixed liquids or more different in specific gravity and viscosity from each other are housed in a water tank 1 and separated into upper and lower layers. The rotor 3 of a rotary viscometer 2 is elevated or lowered from the bottom part or upper part of the water tank 1 as rotating the rotor 3, and the location of the rotor 3 at which a resistance force received by the rotor 3 is changed is detected to detect the liquid level of the upper layer U and the height of the liquid interface between the upper layer U and the lower layer L. By this constitution, it is possible to detect the liquid level and the height location of the liquid interface of even a liquid of a dark color or a high-temperature liquid easily and accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing water and oil from a dry distillation furnace of a municipal refuse treatment facility or a metal and slag of an ash melting furnace, which have different specific gravities and viscosities.
The present invention relates to a liquid level detection method for detecting a liquid level and a liquid interface position of two or more kinds of liquids which are vertically separated.

[0002]

2. Description of the Related Art
As a method of measuring the liquid level of a liquid located particularly in a lower layer among two or more kinds of liquids separated into layers vertically such as water and oil, a method utilizing a difference in specific gravity of each layer is known.

[0003] That is, this method is a method utilizing the property that when a float having a substantially intermediate specific gravity of two kinds of liquids having different specific gravities is put into a transparent water tank, the float floats at the liquid interface of the lower layer liquid. The height position of the lower liquid interface (storage amount) is known by visually checking the height position of the float from the side surface of the water tank.

However, in such a conventional method,
It can be used only when the liquid is almost transparent so that the height of the float can be seen from outside through the water tank, and when the float position is dark liquid (tar etc.) or the water tank itself is not transparent. Has the disadvantage that it cannot be applied. In addition, in the case of this method, there is a problem that as the size of the water tank increases, the float becomes more and more difficult to see and the recovery thereof is not easy. Further, when the target liquid is an extremely high-temperature liquid such as metal and slag coming out of an ash melting furnace, a float that can withstand this temperature is not found, and an operator cannot approach the liquid. It is impossible.

Accordingly, the present invention has been devised in order to effectively solve such a problem, and a main object of the present invention is to provide a liquid surface and a liquid interface of two or more kinds of mixed liquids which are vertically separated. An object of the present invention is to provide a novel liquid level detection method capable of easily and accurately detecting a position.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides two or more kinds of mixed liquids having different specific gravities and viscosities in a water tank, and separates the liquids into upper and lower layers. Rotating the rotor of the rotary viscometer from the top or bottom of the water tank while rotating it up and down, detecting the position where the resistance force applied to the rotor has changed, and detecting the liquid level of the upper layer liquid and the liquid interface of the upper layer and the lower layer. The height is detected.

That is, the present invention focuses not only on the specific gravity difference between the upper layer liquid and the lower layer liquid, but also on the viscosity difference, and detects the difference in the viscosity difference with a rotary viscometer that moves up and down. It is possible to easily and accurately know the liquid surface and the height position of the liquid interface not only as a transparent liquid but also as a dark liquid such as tar or a high-temperature liquid such as molten metal / slag. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the method of the present invention, in which 1 is a water tank, L is a lower layer liquid (for example, water, slag, etc.) separated into layers at the bottom of the water tank 1, and U is An upper liquid separated from the lower liquid L (for example, oil, tar,
Reference numeral 2 denotes a rotary viscometer attached to the water tank 1. The lower liquid and the upper liquid are not only specific gravity,
The viscosities also have different properties.

The rotary viscometer 2 includes a rotor (propeller) 3 that rotates in the liquid in the water tank 1, a pipe-shaped support rod 4 that vertically supports the rotor 3, and a support rod 4. A drive unit 5 provided at the upper end for driving the rotor 3 via a drive rod (not shown); a resistance detection unit 6 for detecting the resistance of the rotor 3;
And a measuring unit 8 for measuring the height position of the rotor 3. The elevating means 7 is fixed to the upper part of the water tank 1 so that the relative position with respect to the water tank 1 does not change. Inside the casing, a pair of rollers 9, 9 which sandwich the support rod 4 and move up and down, A motor 10 for rotating the rollers 9, 9 is accommodated therein.

In the above, first, the support rod 4 is raised vertically by the lifting means 7 and the rotor 3 at the lower end thereof is lifted.
Is positioned on the liquid surface of the upper layer liquid U, the rotor 3 is rotated at a constant rotational speed by the drive unit 5, and when the rotational speed becomes constant, the support rod 4 is slowly moved by the elevating means 7. And descend. And this rotor 3 is the upper liquid U
When the rotor 3 reaches the liquid level, the rotor 3 receives the resistance of the upper layer liquid U, so that a torque is applied in order to keep the rotation speed constant. By measuring the height position of the upper layer liquid U, the liquid level of the upper layer liquid U can be first known. Here, as the measuring means 8 and the measuring method,
For example, if a scale engraved on the support rod 4 is monitored by the CCD camera or detected by an infrared sensor using a CCD camera or an infrared sensor, an operator can directly mount the support rod 4 on site. There is no need to visually check the scale, and the measurement can be performed extremely easily and safely. In particular, when the liquid stored in the water tank 1 is a liquid that generates harmful gas, or when an extremely hot liquid such as metal and slag coming out of an ash melting furnace cannot be accessed by an operator. , A more secure and effective way. The rotation speed of the rotor 3 at this time is, of course, set as low as possible so as not to agitate the liquid. When these liquids are extremely high-temperature substances such as metal and slag coming out of an ash melting furnace, it goes without saying that the material of the rotor 3 and the like is excellent in heat resistance such as ceramics.

Next, when the liquid level of the upper layer liquid U is detected in this way, the rotation speed of the rotor 3 is constantly checked, and the support rod 4 is further lowered slowly. When the rotor 3 reaches the liquid level of the lower layer liquid L, the viscosity of the lower layer liquid L is larger than the viscosity of the upper layer liquid U, so that the rotational resistance of the rotor 3 increases and the number of rotations becomes constant. Since the required torque further increases, the height position of the liquid interface of the lower layer liquid L can be accurately known by measuring the scale of the support rod 4 at the moment when the torque increases by the measuring means 8 in the same manner as described above. .

As described above, the method of the present invention focuses not only on the specific gravity difference between the liquids which are vertically separated, but also on the viscosity difference thereof.
Since the difference in the viscosity difference is detected by the rotary viscometer 2, not only a transparent liquid as in the related art but also a dark liquid such as tar or an extremely high temperature liquid such as metal and slag. It is also possible to easily and accurately know the height position of the liquid interface.

In the present embodiment, while the rotor 3 is lowered from above the liquid level, the change in the number of rotations is detected to detect the position of the liquid level.
May be positioned at the bottom of the water tank 1 in advance, and the position of the liquid level may be detected by detecting a change in the number of revolutions while slowly rising from the bottom of the water tank 1. Further, as shown in FIG. 2, the method of the present invention can be applied to three or more layers as long as the liquid in the water tank 1 is vertically separated. Further, the rotational viscometer 2 to be used is not limited to one, and if two or more are used at the same time, more accurate detection becomes possible.

Further, in the above embodiment, the liquid level of the liquid already stored in the water tank 1 is detected, but as shown in FIG. The rotary viscometer 2 is fixed in advance so as to be positioned at a predetermined height, and two or more mixed liquids are slowly separated into a water tank 1 while the rotor 3 is rotated at a predetermined rotation speed. The liquid level may be detected while detecting the liquid level. In this case, the lifting and lowering means 7 for raising and lowering the rotor 3 and the measuring means 8 for measuring the height of the rotor 3 are not required, so that the structure is simpler and the liquid in a certain layer is not required. It can also be used as a sensor for detecting a stop of liquid supply when the amount reaches a fixed amount.

[0016]

In summary, according to the present invention, not only a transparent liquid as in the prior art but also a dark liquid such as tar or a high-temperature liquid such as molten metal or slag, and an operator approaches. Even in the case where it cannot be performed, excellent effects such as easy and safe and accurate detection of the liquid surface and the height position of the liquid interface can be exhibited.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing one embodiment of the method of the present invention.

FIG. 2 is a conceptual diagram showing another embodiment of the method of the present invention.

FIG. 3 is a conceptual diagram showing another embodiment of the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water tank 2 Rotary viscometer 3 Rotor 4 Support rod 5 Drive part 6 Resistance detection part 8 Measuring means 9 Roller 10 Motor U Upper liquid L Lower liquid

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Shun-ichiro Ueno 1 Shinnakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima-Harima Heavy Industries Co., Ltd. (72) Inventor Junya Nishino Shinnaka, Isogo-ku, Yokohama-shi, Kanagawa 1 Haramachi Ishi Kawashima Harima Heavy Industries, Ltd. Technical Research Institute F-term (reference) 2F014 AB01 CB02

Claims (3)

[Claims] 1. A liquid tank containing two or more kinds of mixed liquids having different specific gravities and viscosities in a water tank and separating them into upper and lower layers, respectively, and then using a rotor of a rotary viscometer from the top or bottom of the water tank. Liquid level detection characterized by detecting the position at which the resistance force applied to the rotor has changed while rotating, and detecting the liquid level of the upper layer and the liquid interface between the upper and lower layers, respectively. Method. 2. A rotary viscometer is positioned at an arbitrary height in a water tank and rotated, and two or more kinds of mixed liquids having different specific gravities and viscosities are continuously fed into the water tank. The liquid level is raised while vertically separating the layers, and the position where the resistance force applied to the rotor has changed is detected to detect the liquid level of the upper liquid and the height of the liquid interface of the lower layer respectively. A liquid level detection method. 3. The rotary viscometer, a rotor that rotates in a liquid in the water tank, a support rod that supports the rotor, lifting means that lifts and lowers the support rod, and a resistance of the rotor. 3. The liquid level detection method according to claim 1, wherein a resistance force detection unit that detects a force and a measurement unit that measures a height position of the rotor are used.