JPS6335941B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detector for separating two types of non-dissolving liquids having different specific gravities. More specifically, the present invention relates to a liquid contamination detector for insoluble liquid that separates and detects when a non-dissolved liquid with a lower specific gravity is mixed into a liquid with a higher specific gravity.

Conventionally, when heating heavy oil with steam using a heat exchanger, the heavy oil is heated by the steam through a pipe wall, but if there is a hole in the pipe, the two can leak into each other, causing trouble. I had something to make.
In this case, the heavy oil mixed in with the steam is mixed into the steam drain and discharged, but conventionally it was only visually observed during inspections, and there was no inexpensive equipment that could detect heavy oil contamination or leaks early. , its appearance was hoped for.

In response to the above-mentioned needs, the present invention provides a liquid contamination detector for non-dissolved liquid that is simple and has good field adaptability, and can detect contamination of, for example, heavy oil into a drain at an early stage. The present invention is applicable not only to the detection of contamination of heavy oil in drains, but also to a liquid contamination detector that detects a wide range of situations in which a liquid with a high specific gravity is mixed with a liquid that does not dissolve in the liquid and has a lower specific gravity.

Therefore, the gist of the present invention is to divide the inside of a container for receiving a stock solution containing a liquid with a high specific gravity and an insoluble liquid with a low specific gravity into two tanks with a partition wall so that the bottoms communicate with each other. An overflow port was provided in the tank, the overflow port of the tank on the undiluted solution receiving side was made higher than the overflow port of other tanks, and an overflow detection device was installed downstream of the overflow port of the tank on the undiluted solution receiving side. A liquid contamination detector for non-dissolving liquid is characterized by the following.

The present invention will be explained in detail below with reference to the figures. FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a plan view of the embodiment of the present invention.
AA sectional view, and FIG. 3 is a BB sectional view of FIG. 1.
In the figure, a stock solution (hereinafter simply referred to as stock solution) is a mixture of a liquid with high specific gravity (hereinafter referred to as heavy liquid) and an insoluble liquid with low specific gravity (hereinafter referred to as light liquid).
is received into the container 1 from the stock solution supply pipe 3. The inside of the container 1 is partitioned into two tanks by a partition wall 2 such that the bottom thereof communicates with each other through a communication portion 14, and each tank is provided with an overflow port. Therefore, the overflow port of the tank on the raw liquid receiving side (hereinafter referred to as the receiving tank) is the light liquid overflow port 4,
The overflow port of the other tank (hereinafter referred to as the discharge tank) is the heavy liquid overflow port 5, and its level is lower than the light overflow port by Δh. An overflow pipe 8 continues to the light liquid overflow port 4, and a liquid reservoir 7 is provided downstream, and a thermometer 6 is attached to the liquid reservoir 7 as an overflow liquid detection device.

In the liquid contamination detector configured as described above, the stock solution is supplied from the stock solution supply pipe 3 to the receiving tank 12, and if the stock solution is only a heavy liquid and no light liquid is mixed, all the stock solution is placed under the partition wall 2. It passes through the communication part 14 and overflows from the heavy liquid overflow port 5. At this time, the level of the stock solution corresponds to the level a of the heavy liquid overflow port 5 of the receiving tank 12 and the discharge tank 13. However, if light liquid is mixed into the stock solution, the light liquid will separate from the heavy liquid and float to the surface due to the difference in specific gravity in the receiving tank 12. Since it is blocked by the partition wall 2 and cannot pass through the communication section 14, it will gradually move to the receiving tank 12.
Accumulates above the heavy liquid level of 2. At this time, the level of the heavy liquid in the receiving tank 12 is returned to the original level a due to the weight of the light liquid.
However, the level of the upper surface of the light liquid rises to a level higher than the level a of the heavy liquid overflow port 5 by the difference in specific gravity between the light liquid and heavy liquid, and reaches the level c of the light liquid overflow port 4. When the level C is reached, the light liquid exceeding level C is discharged from the light liquid overflow port 4 through the overflow pipe 8 to the liquid reservoir 7, and the thermometer 6, which is an overflow liquid detection device, detects the light liquid and issues an alarm. , or stop the device.

Level difference between level a of heavy liquid overflow port 5 and level c of light liquid overflow port 4 when light liquid starts overflowing (hereinafter referred to as overflow level difference) Δh, specific gravity of heavy liquid γ ₁ , light liquid The relationship between the specific gravity γ ₂ and the depth d of the light liquid layer is as follows.

△h≡hc−ha (overflow level difference) Considering the weight balance between the receiving tank 12 and the discharge tank 13 above the heavy liquid level b, (d−△h) γ ₁ = dγ ₂ Transforming this, △h=γ ₁ −γ ₂ /γ ₁ d.

Considering this in the case of water and heavy oil, γ ₁ =
1. Since γ ₂ = 0.95, △h = 0.05d, that is, the level c of the light liquid overflow port 4 is higher than the level a of the heavy liquid overflow port 5 by 0.05 times the depth d of the heavy oil layer. . To give a numerical example, when the depth d of the heavy oil layer is 2 mm, this overflow level difference △h is slightly
It is only 0.1mm. In other words, the overflow level difference
If it is kept at 0.1mm, the heavy oil will be 2mm deep above the water.
When it accumulates, it begins to overflow from the light liquid overflow port. However, if the overflow level difference △h is only 0.1 mm, it is difficult to set up a liquid contamination detector, and the ripples in the receiving tank 12 when supplying raw liquid cause drain water to leak into the light liquid overflow port even if no heavy oil is mixed in. There is a risk that the overflow liquid may overflow from No. 4 and cause the overflow detection device to malfunction. On the other hand, if the overflow level difference △h is set to a large value, malfunctions will not occur, but it will not be possible to detect it until a large amount of heavy oil gets mixed in, or even a small amount gets mixed in over a long period of time until a large amount accumulates. detection is difficult. This is true not only in the case of heavy oil and water, but also in cases where the difference in specific gravity between the two liquids is small.

Therefore, if rapidity or high accuracy is required to detect light liquid contamination, additional means are required.

In the present invention, as a means to solve this contradictory problem, firstly, the overflow level difference is made relatively large to eliminate malfunction, and secondly, the detection delay due to the large overflow level difference is reduced. Therefore, the liquid area of the receiving tank should be made as small as possible.
However, in a simple tank-shaped container, the depth of the light liquid layer = volume of light liquid / area of receiving tank. However, if the liquid area of the receiving tank 12 is made smaller, the stock solution supply pipe 3 and the light liquid overflow port 4 will be brought closer together, increasing the risk of malfunctions due to ripples during supply of the stock solution, and at the same time, the light liquid will separate from the stock solution and float. Therefore, there is a high possibility that the heavy liquid will enter the discharge tank while being mixed with the heavy liquid. In order to solve this problem, in the present invention, the shape of the receiving tank 12 is made into a rectangle or an equivalent shape which is elongated perpendicularly to the partition wall 2, and the light liquid overflow port 4 is formed into a rectangular shape that is elongated in the direction perpendicular to the partition wall 2.
It is preferable to provide the bulk solution supply pipe 3 at the opposite end of the partition wall and to separate the stock solution supply pipe 3 from the opposite end of the partition wall. With this configuration, the light liquid overflow port 4 is less affected by ripples when supplying the concentrate, and the distance from the concentrate supply pipe 3 to the partition wall 2 is increased, which improves the effect of separating heavy liquid and light liquid. gets better.

FIG. 6 is a longitudinal sectional view showing another embodiment of the present invention. Another means of the present invention for reducing the liquid area of the receiving tank is to reduce the liquid area of the receiving tank 12 as shown in FIG.
The liquid surface of the light liquid overflow port 4 is covered with a cover 18 except for the area around the light liquid overflow port 4. As shown in Figure 6, the cover surrounds the light liquid overflow port 4, and its upper end is connected to the light liquid overflow port 4.
A cylindrical part 19 that is higher than level c of the heavy liquid overflow port 5 and whose lower end is lower than level a of the heavy liquid overflow port 5, and a land part 20 that extends outward from the lower end of the cylindrical part 19 and connects to the side surface of the receiving tank 12. is preferred. When such a configuration is adopted, the light liquid mixed in the stock solution separates and floats due to the difference in specific gravity and collects under the land portion 20 of the cover body 18, but the liquid level in the cylindrical portion 19 is released. Therefore, they gradually gather in the cylindrical portion 19 and float above the heavy liquid. Therefore, the cross section of the cylindrical portion 19 is similar to that of the supply tank 12.
Since it is small compared to the total area of the light liquid, when only a small amount of light liquid gathers, the liquid level rises and reaches the level c of the light liquid overflow port 4, which overflows from the light liquid overflow port 4 and is detected. .

Further, in this case, since the overflow level difference Δh can be made large, there is less risk of heavy liquid overflowing from the light liquid overflow port 4 and causing malfunction. If the land part 20 of the shell is inclined outward from the cylinder part 19 as shown in FIG. Even if it gets mixed in, it has the effect of making it easier to remove.

In order to prevent the receiving tank 12 from undulating, the stock solution supply pipe 3 is preferably opened below the liquid level, and when there is pressure such as in a steam drain, it is preferable to have one end open to the atmosphere for supply. is preferred. Also, the light liquid overflow port 4 may be provided horizontally on the wall of the tank,
As shown in FIGS. 1 to 3 and 6, it may be provided upward in the tank. If it is installed upward in the tank, it will be easier to collect the liquid, and if the level c of the light liquid overflow port 4 can be adjusted by screwing a short pipe into the light liquid overflow port 4 in a watertight manner, it will be easier to detect the liquid. This is preferable because the sensitivity can be adjusted. Furthermore, the same effect can be obtained by adjusting the level a of the heavy liquid overflow port 5 by making the weir plate of the heavy liquid overflow port 5 adjustable instead of adjusting the level of the light liquid overflow port 4. It will be done. In addition to the weir, the heavy liquid overflow port can also be configured by an overflow pipe.

Next, the overflow liquid detection device will be explained. As the overflow liquid detection device, a thermometer 6 is convenient if the light liquid is higher than normal temperature, as in the case of a heat exchanger that heats heavy oil with steam, or conversely, if it is lower than normal temperature. If the light liquid is colored or opaque, a photoelectric detection device can be used as shown in FIG. The photoelectric detection device collects light emitted from a phototube 9 through a slit 10 or a lens, passes through a liquid reservoir 7, and receives the light with a photocell 11.
In this case, the liquid reservoir 7 is made of a transparent material such as glass or plastic, so light normally passes through it, but when light liquid accumulates, the transmitted light is blocked or attenuated, so the photocell catches it and detects it. The overflow detection device may further include a gravity operated limit switch as shown in FIG. Balance 1 installed below the overflow pipe 8
A saucer 21 is placed on one side of the balance, and a weight 17 that maintains balance with the tray 21 is attached to the opposite side of the balance. When light liquid flows into the tray 21 from the overflow pipe 8, the tray 21 descends due to its increased weight, and the weight 17 on the opposite side jumps up, causing the limit switch 1 to
6 is activated and contamination with light liquid is detected.

If the overflow liquid detection device is a thermometer or a photoelectric detector, the liquid reservoir 7 is not necessarily necessary and it is possible to directly detect the overflow liquid, but it is recommended to use the liquid reservoir 7 in order to improve detection accuracy. preferable.

As described above, the liquid contamination detector for immiscible liquids of the present invention is an extremely simple and inexpensive device, has no moving parts, and
It does not require power, does not require maintenance, and can quickly and reliably detect liquid contamination without malfunction, making it suitable for field use. The above description has mainly focused on the case of leakage and contamination of heavy oil from a heat exchanger that heats heavy oil with steam, but the present invention is not limited to this and can be applied to the detection of contamination of a wide range of insoluble liquids with different specific gravities.

In addition, as the container 1 described above, a box-shaped container is used,
Although an example has been described in which the receiving tank 12 and the discharging tank 13 are partitioned by the partition wall 2, the same effect can be obtained by using a communicating device in which the bottoms of the two containers are connected through a pipe.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG.
The figure is a sectional view of AA in figure 1, and figure 3 is BB of figure 1.
A sectional view, FIG. 4 is a front view showing the second embodiment, FIG. 5 is a side view showing the third embodiment, and FIG. 6 is a front view showing the second embodiment.
FIG. In the figure, 1... Container, 2... Partition wall, 3...
Raw solution supply pipe, 4...Light liquid overflow port, 5...Heavy liquid overflow port, 6...Thermometer, 7...Liquid reservoir, 8...Overflow pipe, 9...Phototube, 10...Slit , 11...
Photocell, 12... Receiving tank, 13... Discharging tank, 14... Communication section, 15... Balance, 16... Limit switch, 17... Heavy hammer, 18... Capture body,
19...Cylinder part, 20...Land part, 21...Saucer.

Claims (1)

[Claims] 1. The inside of a container that receives a stock solution in which a liquid with a high specific gravity is mixed with an insoluble liquid with a low specific gravity,
Divided into two tanks with a partition wall so that the bottoms communicate,
An overflow port is provided in each tank, the overflow port of the tank on the undiluted solution receiving side is set higher than the overflow port of the other tank, and an overflow detection device is installed downstream of the overflow port of the tank on the undiluted solution receiving side. A liquid contamination detector for non-dissolving liquid, characterized in that: 2. The insoluble liquid according to claim 1, characterized in that a liquid reservoir is provided downstream of the overflow port of the tank on the raw solution supply side, and an overflow liquid detection device is provided in the liquid reservoir. Liquid contamination detector. 3. Claim 1, characterized in that the tank on the undiluted solution supply side has a rectangular or equivalent shape that is elongated in a direction perpendicular to the partition wall, and the overflow port of the tank on the undiluted solution receiving side is provided near the partition wall. A liquid contamination detector for non-dissolving liquid according to item 1 or 2. 4. The non-dissolving liquid according to any one of claims 1 to 3, wherein the overflow port of the tank on the raw solution receiving side opens at the tip of an overflow pipe whose top is vertical. Liquid contamination detector. 5. The insoluble liquid according to any one of claims 1 to 4, characterized in that the liquid level of the tank on the undiluted solution receiving side is covered with a cover except for the area around the overflow port. Liquid contamination detector. 6. A cylindrical part that surrounds the overflow port of the tank on the undiluted solution receiving side and has an upper end higher than the overflow port and a lower end lower than the overflow port, and a cylindrical part that expands outward from the lower end of the cylindrical part and receives the undiluted solution. 6. The liquid contamination detector for non-dissolved liquid according to claim 5, characterized by comprising a land portion connected to the side surface of the side tank. 7. The liquid contamination detector for insoluble liquid according to claim 6, wherein the land portion of the revetment body is inclined outward from the cylindrical portion. 8. A liquid contamination detector for insoluble liquid according to claims 1 to 7, characterized in that the level of one or both of the overflow ports is adjustable. 9. A liquid contamination detector for insoluble liquid according to any one of claims 1 to 8, wherein the overflow liquid detection device is a thermometer. 10 Claim 1, characterized in that the liquid reservoir is transparent and the overflow liquid detection device is a photoelectric detector.
9. A liquid contamination detector for non-dissolving liquid according to any one of items 8 to 8. 11. The liquid contamination detector for insoluble liquid according to any one of claims 1 to 8, wherein the overflow liquid detection device is a limit switch operated by gravity.