JPS62132508A - Method and apparatus for detecting oil layer - Google Patents

Abstract

PURPOSE:To surely and automatically fractionate and recover water and oil from a liquid mixture composed of oil and water by exactly detecting the point of the time when the water changes to the oil in the stage of discharging the liquid from a tank. CONSTITUTION:The liquid divided to two layers in the tank 1 is discharged from a lower discharge pipe 2 by a pump 5. An oil layer 9 arrives at the lower discharge pipe 2 when there is no more water in the tank 1. A body 12 having the shape of a SHISHIODOSHI (a device conducing a liquid such as water intermittently as shown Figure) turns to a chain line position and discharges the oil therein toward a funnel 20 when the oil accumulates in an oil receiving empty chamber 16 of the body 12 by drawing a discharge parabolic curve B. An arm 21 of a limit switch 10 is pushed by a bar member 17 thereof at the same instant. The body 12 is reset to the home position shown by a solid line after the discharge of the oil. The switch 19 sends a signal to solenoid valves 6, 8 to close one 6 and to open the other 8 by discriminating such reset as the time when the water is changed to the oil. As a result, the oil layer 9 is conducted through a branch pipe 7 toward an oil recovering tank.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention separates an oil-water mixture into two layers in a tank, and detects the point at which water changes to oil while being discharged from a lower extraction pipe. The present invention relates to a method for detecting an oil layer and a device therefor, which can be used for separating and recovering oil and water from waste liquid.

Conventional technology Conventionally, in order to separate and recover oil and water from an oil and water mixture such as oil-containing waste liquid, vaginal fluid was stored in an oil and water separation tank such as a tank, heated,
The oil layer and the water layer are separated by chemical injection, etc., and this is extracted from the bottom extraction pipe of the tank, and during the extraction, the point at which the water layer changes to the oil layer is confirmed and separated. Confirmation of changes in the layer is made by draining the liquid in the tank using dipstick cocks installed in stages on the side wall of the tank, or by observing the liquid discharged from the lower extraction pipe.

When this layer changes from water to oil, water and oil are separated and recovered by changing the discharge direction, etc.

Problems to be Solved by the Invention However, there is no means to know when switching to the oil layer.
When using the above-mentioned oil check cocks, each cock must be operated and checked one by one, which is time-consuming, and if there is a layer boundary between the cocks, it cannot be clearly checked.

Further, when checking while removing from the lower extraction pipe, there is an inconvenience that the operator must constantly monitor the discharge port.

Means for Solving the Problems The present invention has been made to solve the above problems.
As an oil layer detection method, the oil-water mixture is separated into two layers in a tank.
In an oil layer detection method that detects the point at which the liquid changes from water to oil while being discharged from the lower extraction pipe, the liquid flowing out from the lower extraction pipe is guided to a discharge port opening in the horizontal direction and discharged. The vessel receives kernel oil at points along the discharge parabolic curve drawn by the oil out of the discharged liquid, and when the amount of oil reaches a predetermined amount, it is determined that it is time to change from water to oil. In addition, a tank for storing an oil-water mixture as an oil layer detection device, a discharge port opening in the horizontal direction provided at the tip of a conduit from the lower extraction pipe of the tank, and a discharge port below the discharge port. The system employs a configuration that includes a drop-off type vessel installed at a location along the oil discharge parabolic curve, and a sensor that is activated by the rotation of the vessel due to the stored oil.

According to the active oil layer detection method, first, a valve is opened and, if necessary, a pump or the like is activated in order to discharge the liquid separated into two layers in the tank from the lower extraction pipe of the tank. Water starts coming out of the tank from the lower layer, and after gushing out horizontally from the discharge port, it falls in a parabolic curve to the area that receives the water.

After that, when the water layer finishes discharging and transfers to the oil layer, the discharge parabolic curve from the discharge port approaches the discharge port side than in the case of water because oil has a higher viscosity than water. can be stopped.

Receiving a predetermined amount of liquid in this container means that the liquid has moved from the water layer to the oil layer, and oil recovery can then be started.

Next, the oil layer detection device is activated by opening its discharge port, whereby the water in the tank flows out, and immediately after the water disappears, the oil flows out. Since oil has a higher viscosity than water and travels a shorter distance from the discharge port, the shishiodoshi-style vessel located along the discharge parabolic curve receives the oil.

The shishiodoshi type container receives a fixed amount of oil and rotates when it is taken.
Activate the sensor. The sensor thereby issues a signal that, for example, switches a valve in a waste liquid recovery system, directing the oil to a different location than the water.

Embodiment FIGS. 1 to 5 show an oil-water mixed liquid separation and recovery device using the oil layer detection method and device according to the present invention.
In these figures, reference numeral 1 indicates a tank for storing an oil-water mixture, and the inoculation 1 is provided with a lower extraction pipe 2, and the limb pipe 2 reaches a separate collection point for the oil-water mixture via a conduit 3. At this point, the tip of the conduit 3 extends horizontally and ends as a discharge port 4 opening in the horizontal direction. Also,
A pump 5 and a solenoid valve 6 are provided in the middle of the conduit 3, and a branch pipe γ extends from between them in the other direction, and the branch pipe 7 is also provided with a solenoid valve 8.

The tank 1 functions as an oil-water separation tank, in which the oil layer 9 is separated from the water layer 10 and placed above it. Note that when the oil/water mixture is a waste liquid, various foreign substances are mixed in it, but it is generally separated into the above two layers. The liquid separated into two layers in the tank is discharged from the lower extraction pipe 2 by the pump 5, but first it flows out from the water layer 10, passes through the electromagnetic valve 6 which is in an open state, and then the discharge port 4 is also used for recovery. It is discharged towards the hopper 11. Then, the water layer 10 disappears.

When the lower surface of the oil layer 9 reaches the inlet of the lower extraction pipe 20, the solenoid valve 6 closes and the other solenoid valve 8 opens, and the oil passes through the branch pipe 7 to a collection tank (not shown) separate from the water. It will be released to.

In order to detect the arrival of the oil layer 9, the recovery hopper 1
A shishiodoshi type container 12 is installed below the container 1. Since oil has a higher viscosity than water, the discharge parabolic curve A of water extends relatively far from the discharge port, whereas
The oil discharge parabolic curve B draws an arc at a location relatively close to the discharge port 4, but the socket 13 of the shishi-dosing type container body 12 is supported so as to be located at a location along this oil discharge parabolic curve B. bottle 14
and is supported by the frame 15 of this device.

The shishiodoshi body 12 has an oil receiving chamber 1 that stores a predetermined weight of oil.
6, and a bar member 17 at the rear thereof. A stopper 18 is provided below the rotational trajectory of the rod member 17, and a seven-length limit switch 19 is provided above. Further, an oil funnel 20 is installed below the rotation path of the socket 13.

As a result, the water in the tank 1 disappears and the oil layer 9 reaches the lower extraction pipe 2, and when the kernel oil draws a discharge parabolic curve B and accumulates in the oil receiving chamber 16 of the drainer body 12, its weight increases. The balance of the water dropper body 12 is disrupted, and the water dropper body 12 rotates to the chain line position, discharging the oil therein toward the funnel 20 and discharging the oil from the rod member 1.
Press the arm 21 of the limit switch 19 with γ. After the oil is drained, the weight of the rod member 17 overcomes the force and the shishing device body 12 returns to its original position as shown by the solid line.

The limit switch 19 determines that this is the time of change from water to oil, and sends a signal to the solenoid valves 6 and 8.
8 is closed, and the other 8 is opened. As a result, the oil layer 9 is guided toward the oil recovery tank through the branch pipe 7.

Since the recovery water brim 11 temporarily receives not only water but also oil as described above, during soaking, the empty space 2°3 on the side of the side wall 22 to which the conduit 3 is joined and the side wall 24 opposite thereto are The partition wall 26 between the two is divided into two parts, the water discharge parabolic curve B and the water discharge parabolic curve A, toward the discharge port 4 at the tip of the conduit 3. It is growing while being interposed between. As shown in FIG. 6, the upper end 27 of this partition wall 26 is located at distances L1 and L2 from the discharge port in the horizontal and vertical directions, respectively. These L+ and Lz are determined in consideration of the viscosity of various oils to be treated, the performance of the pump 5, the diameter of the discharge port 4, etc. In the case of this embodiment, the upper end 27 of the partition wall 26 is L+-200, L
2-20 It is set at the Q+m position, and the discharge port 40
The outer diameter is set to 40A. Under such conditions,
The discharge amount of water from pump 5 is Qw = 10m3/Hr
-0.17m/min (H20m), the discharge amount Q of the pump 5 for oil is 1320cs when the viscosity of the kernel oil is 1320cs.
As t, the conversion result according to the table in Figure 7 is CQ-0,15, and we obtain Q = C (2X Q w -1,5 mV Hr. As a result, water draws curve A and has an initial velocity of v -2 m/s.
ec over the bulkhead 26, the oil has an initial velocity v = 0.3 r
It draws a curve B at n/sec and falls below the partition wall 26 without touching the tip 27 of the partition wall 2G.

A funnel 28° 29 is provided in each chamber 23, 25 in the recovery hopper 11 partitioned by the partition wall 26,
One of the drop ports 28 faces the socket 13 of the shishiodoshi type vessel body 12, and the other drop port 29 is connected to a conduit 30 leading to a water recovery tank (not shown). In addition, the drop opening of the oil receiving funnel 20 below the shishi-dosing type vessel body 12 is connected to the funnel 2.
Since some water may be contained in the tank 1, it is connected to a conduit 31 leading to the tank 1.

The upper part of the collection hopper 11 is open and covered with a lid 32, and the interior of the collection hopper 11 can be inspected and cleaned easily by opening the lid 32.

Effects of the Invention Since the oil layer detection method according to the present invention has the above-described configuration and operation, it is possible to accurately detect the point in time when the liquid changes from water to oil when the liquid is extracted from the tank 1. Therefore, it is possible to reliably and automatically separate and recover water and oil from waste fluid, which is an oil-water mixture.

Furthermore, since it is determined that the oil layer 9 has arrived after waiting for the amount of oil to reach a predetermined amount in the container body 12, water that may be mixed in with the oil during the transition from water to oil is completely shut off.
This makes it possible to reliably separate and recover only oil from other waste liquids.

In addition, since the oil layer detection device according to the present invention uses the drop-off type vessel 12, the detection device can be driven using the weight of the oil. Therefore, it has a simple structure with fewer components, is less likely to malfunction, and is easy to maintain. This is also very advantageous when used for dirty oil, etc.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional view of a separation and recovery device using the oil layer detection method and device according to the present invention, FIGS.
The figure is a partially cutaway plan view, Figure 3 is a partially cutaway front view, Figure 4 is a partially cutaway right side view, and Figure 5 is the ■- in Figure 3.
6 is a graph showing a discharge parabolic curve of oil and water, and FIG. 7 is a graph showing a pump performance curve correction curve depending on viscosity. 1: Tank, 2: Lower extraction pipe, 4: Discharge port, 9: Oil layer, 10
: Water layer, 12: Shishiodoshi weapon body, 19: Riminoto switch.

Claims (2)

[Claims] (1) In an oil layer detection method that separates an oil-water mixture into two layers in a tank and detects the point at which water changes to oil while being discharged from a lower extraction pipe, the flow from the lower extraction pipe is The liquid is guided to a discharge port opening in the horizontal direction and discharged, and the container body receives the oil at a location along the discharge parabolic curve drawn by the oil, so that the amount of oil reaches a predetermined amount. An oil layer detection method characterized by determining when the change occurs from water to oil. (2) A tank for storing an oil-water mixture, a discharge port opening in the horizontal direction provided at the tip of a conduit from the lower extraction pipe of the tank, and a discharge parabolic curve of oil below the discharge port. An oil layer detection device comprising a shishiodoshi-type vessel installed at a location along the road, and a sensor activated by rotation of the vessel due to stored oil.