JP4348766B2 - Liquid separation / discharge device and liquid separation / discharge method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, for example, separates two or more kinds of liquids that are separated into upper and lower layers as a result of different specific gravity and viscosity, such as water and oil from a carbonization furnace of a municipal waste treatment facility or metal and slag of an ash melting furnace. The present invention relates to a liquid separation / discharge device and a liquid separation / discharge method.
[0002]
[Prior art and problems to be solved]
Conventionally, as a method of separating and discharging a mixed liquid of two or more kinds of liquids having different specific gravities such as water and oil, such a mixed liquid is temporarily stored in a water tank or the like and separated into layers vertically. In general, a method is known in which each liquid layer is provided with a discharge line having a discharge port, and each liquid is separately discharged from each discharge line by a pump or the like. Further, in such a separation and discharge method, in order to detect the respective liquid levels, a float having a specific gravity approximately halfway between the liquids separated into upper and lower layers is put into a transparent water tank, and the height of the float is determined. The liquid level of each liquid is detected by visually confirming the position from the side surface of the water tank.
[0003]
Therefore, in the conventional liquid separation and discharge method, each liquid is manually discharged from each discharge line alternately or simultaneously while checking the liquid level of each liquid by visually checking the height position of the float. Will do.
[0004]
However, in such a conventional method, it can be used only in the case of a liquid that is almost transparent so that the height position of the float can be visually observed through the water tank from the outside. ) And the water tank itself is non-transparent, there is a disadvantage that it cannot be applied. Further, in this method, there is a problem that the float becomes more difficult to visually check as the size of the water tank increases, and the recovery thereof is not easy. Furthermore, if the target liquid is an extremely high-temperature liquid such as metal and slag that comes from an ash melting furnace, for example, a float that can withstand this temperature is not found, and workers cannot approach, so this method is applied. It is impossible. Moreover, since the discharge control of each liquid is based on the labor of an operator, it is inefficient and automation is desired.
[0005]
Therefore, the present invention has been devised to effectively solve such problems, and the main purpose of the present invention is a novel one capable of separating and automatically discharging two or more kinds of mixed liquids that are separated into layers vertically. A liquid separation / discharge apparatus and a liquid separation / discharge method are provided.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a water tank into which a mixed liquid composed of two or more liquids having different specific gravities and viscosities flows, and a discharge line for discharging the upper layer liquid and the lower layer liquid separated into layers in the water tank, respectively. And a rotor installed in the water tank, a pipe-like support rod that vertically supports the rotor, and a drive unit that supports the support rod and rotationally drives the rotor. In order to detect the torque level that changes to keep the rotor rotation speed constant and detect the liquid level height of the upper layer liquid and the liquid level height of the lower layer liquid, the rotor is installed with different installation heights. a plurality of rotary viscometer, in which and a control unit which controls the opening and closing of the valves of the respective discharge lines in accordance with the liquid level of the separated liquid detected by these rotational viscometer. Then, using such a liquid separation and discharge device, when the liquid level height of the upper layer liquid and the lower layer liquid separated in the water tank reaches the rotor of each rotary viscometer, the valve of each discharge line Is opened to discharge the respective separated liquids, and then, when each liquid level falls below the level of the rotor, the valves of the respective discharge lines are closed to stop the discharge.
[0007]
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 difference in viscosity, and by detecting the difference in viscosity with a rotary viscometer, the liquid level of each liquid is grasped. The valve of each liquid discharge line is controlled to open and close according to each liquid level detected by a rotary viscometer.
[0008]
This makes it possible to easily and accurately detect the liquid level of not only transparent liquids as in the past, but also high-temperature liquids such as dark liquids such as tar and molten metal / slag. Separation and discharge control can be performed automatically.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment for carrying out the present invention will be described with reference to the accompanying drawings.
[0010]
FIG. 1 shows an embodiment of a liquid separation apparatus according to the present invention.
[0011]
As shown in the figure, this liquid separation device includes a mixed liquid composed of two kinds of liquids having different specific gravity and viscosity, for example, a water tank 1 that flows in a state where water and oil, tar, slag and molten metal, etc. are mixed, Discharge lines 2a and 2b for discharging the upper layer liquid and lower layer liquid separated in the water tank 1, respectively, rotational viscometers 3a and 3b for detecting the respective liquid surface heights, and the respective rotations The control unit 5 mainly controls opening and closing of the valves 4a and 4b of the discharge lines 2a and 2b according to the liquid level height of the separated liquids U and L detected by the mold viscometers 3a and 3b. Yes.
[0012]
The rotary viscometers 3a and 3b include a rotor (propeller) 6 that rotates in the separated liquid in the water tank 1, a pipe-like support rod 7 that vertically supports the rotor 6, and the support rod. 7 and a drive unit 8 that rotationally drives the rotor 6, and changes in rotational speed or rotational resistance due to differences in the viscosity of the separated liquids, that is, torque that changes to keep the rotational speed constant. The liquid level of each separation liquid is detected and the liquid level detection signal is input to the control unit 5.
[0013]
Further, the discharge lines 2a and 2b are respectively connected to the side of the water tank 1 up and down, that is, the discharge line 2a side is connected to the bottom of the water tank 1, and the discharge line 2b side is the middle part of the water tank 1, more specifically, the rotary viscometer 3a. The upper and lower rotors 6 are connected to positions above the rotor 6, and the separated liquids separated in the upper and lower directions are separated and discharged from the respective discharge lines 2 a and 2 b. Further, the valves 4a and 4b provided in the discharge lines 2a and 2b are configured to respond instantaneously such as electromagnetic valves, for example, and each of the discharge lines 2a and 2b is controlled by a control signal from the control unit 5. 2b is opened and closed instantaneously to stop the discharge of each separated liquid.
[0014]
In the drawings, 9 denotes a supply line for supplying the liquid mixture, so as to supply the mixed liquid mixture separation into the bottom side or al aquarium 1 aquarium 1 in order to facilitate the post-feed Yes.
[0015]
Next, an example of the method of the present invention will be described using the liquid separation / discharge device having such a configuration.
[0016]
First, the valves 4a and 4b of the discharge lines 2a and 2b are closed, and the rotors 6 and 6 of the rotary viscometers 3a and 3b are rotated and driven from the supply line 9 into the water tank 1. A mixed liquid composed of two kinds of liquids having different specific gravity and viscosity is continuously poured. Then, the liquid mixture is separated into layers in the water tank 1 due to the difference in specific gravity, and the liquid level gradually rises.
[0017]
Then, when the liquid level rises, the liquid level on the upper layer liquid side first reaches the level of the rotor 6 of the rotary viscometer 3a located below the water tank 1, so that the torque of the rotor 6 is increased. At this point, the control unit 5 does not control any of the valves 4a and 4b of the discharge lines 2a and 2b and keeps them closed without receiving the detection signal.
[0018]
Next, in this way, the liquid level of each separated liquid further rises and reaches the level of the rotor 6 of the rotary viscometer 3b in which the liquid level of the upper layer liquid is located above. When the number increases, as shown in FIG. 2, the control unit 5 detects this, determines that the liquid level has reached the upper limit, opens the valve 4b of the discharge line 2b in the middle stage, and opens the upper layer liquid from the discharge line 2b. A part of is discharged. As a result, the liquid level of the upper layer liquid is lowered, and only the upper layer liquid can be separated and discharged out of the water tank 1 from the discharge line 2b. Then, if the rotor 6 of the rotary viscometer 3b is exposed on the liquid surface and its torque decreases as the liquid level of the upper layer liquid falls, the control unit 5 detects this again, It is judged that the level has dropped, and the valve 4b of the discharge line 2b is closed to stop discharging the upper layer liquid. After that, if the liquid level of the upper layer liquid rises again, the upper and lower liquids are effectively separated and discharged from the discharge line 2b to the outside of the water tank 1 by repeating the opening / closing control of the valve 4b of the discharge line 2b as described above. be able to.
[0019]
On the other hand, as the upper layer liquid rises, the liquid level of the lower layer liquid also rises and reaches the vicinity of the discharge line 2b, but before reaching the rotor 6 of the rotary viscometer 3a located below. At this point, it is detected that the rotor 6 has reached that level by further changing the torque due to the difference in viscosity between the upper layer liquid and the lower layer liquid. Then, as shown in FIG. 3, the control unit 5 receiving the level signal opens the valve 4a of the discharge line 2a and discharges the lower layer liquid from the discharge line 2a. In addition to being prevented from being discharged from the middle discharge line 2b side, only the lower layer liquid can be separated and discharged out of the water tank 1 from the water tank 1. Thereafter, if the liquid level of the lower layer liquid is lowered in this way and the rotational speed of the rotor 6 of the rotary viscometer 3a is increased, the controller 5 detects this and closes the valve 4a of the discharge line 2a. Thus, the discharge of the lower layer liquid is stopped. Then, similarly to the upper layer liquid, only the upper layer liquid can be separated and discharged from the discharge line 2b to the outside of the water tank 1 by performing opening / closing control of the valve 4b of the discharge line 2b according to the liquid level of the lower layer liquid. .
[0020]
As described above, 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 liquid level of each liquid by detecting the difference in the viscosity difference using two rotary viscometers. Since the valve of the discharge line is controlled to open and close in accordance with the detected liquid level of each liquid, liquid separation and discharge can be automatically performed without depending on the labor of the worker. Moreover, since the liquid level is detected by a rotary viscometer, it is 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 / slag. However, the liquid level can be detected easily and accurately, and accurate separation and discharge control can be performed.
[0021]
In the present embodiment, an example in which a mixed liquid composed of two kinds of liquids having different specific gravity and viscosity is separated and discharged, but is a mixed liquid of three or more kinds of liquids having different viscosity and specific gravity. However, if the rotational viscometer and the discharge line described above are installed at different installation heights according to the number of the viscometers and the discharge lines, it is possible to automatically and reliably separate and discharge each liquid in the same manner as described above. .
[0022]
【The invention's effect】
In short, according to the present invention, it is possible to automatically and reliably perform detection and separation / discharge of each liquid mixture of two or more kinds of liquids without depending on the labor of an operator. Since the liquid level is detected by a rotary viscometer, it is 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 / slag. However, the liquid level can be detected easily and accurately, and an excellent effect such as accurate separation and discharge control can be exhibited.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a liquid separation / discharge device according to the present invention.
FIG. 2 is a conceptual diagram showing an embodiment of a liquid separation method using a liquid separation / discharge apparatus according to the present invention.
FIG. 3 is a conceptual diagram showing an embodiment of a liquid separation method using a liquid separation / discharge apparatus according to the present invention.
[Explanation of symbols]
1 Aquarium
2a, 2b discharge line
3a, 3b Rotary viscometer
4a, 4b Valve 5 Control unit 6 Rotor 7 Support rod 8 Drive unit 9 Supply line

Claims (2)

A water tank into which a mixture of two or more liquids having different specific gravity and viscosity flows,
A discharge line for discharging the upper layer liquid and the lower layer liquid separated into layers in the water tank,
A rotor installed in the water tank, a pipe-like support rod that vertically supports the rotor, and a drive unit that supports the support rod and rotationally drives the rotor. A plurality of the rotors installed at different heights so as to detect the torque level changing to keep the rotational speed constant and detect the liquid level height of the upper liquid and the liquid level of the lower liquid respectively. A rotational viscometer of
And a control unit which controls the opening and closing of the valves of the respective discharge lines in accordance with the liquid level of the separated liquid detected by these rotational viscometer,
A liquid separation and discharge device comprising:   The liquid separation method using the liquid separation device according to claim 1, wherein the liquid level height of the upper layer liquid and the lower layer liquid separated in the water tank reaches the rotor of each rotary viscometer. The discharge line valve is opened to discharge each separated liquid, and then the discharge line valve is closed to stop the discharge when each liquid level falls below the rotor level. Liquid separation and discharge method.

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