JP2005058813A - Oil water separating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically clean inside of an oil water separating system without disassembling a vacuum chamber, and to maintain a function and performance of high reliability over a long period of time. <P>SOLUTION: In this oil water separating system, an oil water mixture is introduced into the vacuum chamber, the introduced oil water mixture is heated while evacuating the vacuum chamber, to separate oil from water by boiling the mixture in an evacuation state. A nozzle with a discharge port set inward is provided to the side wall of the vacuum chamber for discharging fluid in the tangential direction. The inside wall of the vacuum chamber is washed with the fluid discharged from the discharge port of the nozzle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil / water separator that heats an oil / water mixture introduced into a vacuum chamber in a reduced pressure state to boil it to separate oil and water.
[0002]
[Prior art]
In this type of oil / water separator, the vacuum chamber is connected to the suction side of the vacuum pump, and the main body of the vacuum chamber is provided with a heater for raising the temperature of the internal oil / water mixture (for example, drain). In order to separate the drain into oil and water, the drain is introduced into the vacuum chamber, the vacuum pump is operated, and the vacuum chamber is heated by a heater. When the vacuum chamber reaches the boiling point of water under reduced pressure, the water in the drain evaporates (vaporizes) and is discharged from the vacuum pump, and oil remains in the vacuum chamber.
[0003]
When the drain in the vacuum chamber is reduced, a new drain is introduced into the vacuum chamber to separate the oil and water, and the oil remaining in the chamber is appropriately discharged.
[0004]
Examples of such a device include those described in Patent Documents 1 and 2 below.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-343976 [Patent Document 2]
Japanese Patent Laid-Open No. 2000-18162
[Problems to be solved by the invention]
When the drain is heated by a heater in the vacuum chamber, the water in the drain boils at a boiling point corresponding to the reduced pressure in the vacuum chamber, and the drain water surface fluctuates due to bubbles of steam.
[0007]
When the bubbles break, the oil in the drain is scattered in the vacuum chamber, and a small amount of oil mist flows out along with the water vapor to the suction side of the vacuum pump connected to the vacuum chamber.
[0008]
Along with the operation of the apparatus, a small amount of oil mist adheres to the inner wall of the vacuum chamber and the inner wall of the pipe connecting the vacuum chamber and the vacuum pump, and contaminates the water vapor passage.
[0009]
The water vapor is cooled after passing through the vacuum pump and discharged from the oil / water separator as fresh water that does not contain oil.However, as contamination by the oil mist progresses, oil exceeding the reference value will be mixed into the wastewater from the oil / water separator. In order to prevent this, it is necessary to periodically clean the inside of the vacuum chamber and piping.
[0010]
The piping is structurally easy to disassemble, and when the oil / water separator is stopped, air is taken in from the position close to the vacuum pump in the process of equalizing the pressure inside the vacuum chamber with the atmosphere, and the air flows back to the vacuum chamber at a high speed. By doing so, the oil content on the pipe surface can be pushed back to the vacuum chamber side and cleaned (backwashed).
[0011]
However, as for the vacuum chamber, since the above-described backwashing with air has a slower flow rate than air and has no effect, it is necessary to clean the inside by decomposition, but decomposition is difficult.
[0012]
Therefore, an object of the present invention is to provide an oil / water separator capable of automatically cleaning the inside without disassembling the vacuum chamber and maintaining a highly reliable function and performance for a long time.
[0013]
[Means for Solving the Problems]
A feature of the present invention that achieves the above object is that an oil / water mixture is introduced into a vacuum chamber, the oil / water mixture introduced is heated while reducing the pressure in the vacuum chamber, and the oil / water mixture is boiled under reduced pressure. In the oil / water separator for separating oil and water, a nozzle that discharges fluid in a tangential direction is provided on the side wall of the vacuum chamber with the discharge port as an inner side, and the inner wall of the vacuum chamber is discharged from the discharge port of the nozzle. It is to be cleaned.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a piping system of an oil / water separator according to an embodiment of the present invention.
[0015]
In FIG. 1, 1 is a vacuum chamber, 2 is a cooler, 3 is an ejector, 4 is a water tank, 5 is a heat exchanger, 6 is a pump, and 7 is a refrigeration system.
[0016]
The top of the vacuum chamber 1 and the cooler 2 are connected by a distillation pipe 11, the cooler 2 and the ejector 3 are connected by a distillation pipe 12, and the outlet of the ejector 3 and the water tank 4 are connected by a circulating water pipe 13. The water tank 4 and the cooler 5 are connected by a circulating water pipe 14, the cooler 5 and the pump 6 are connected by a circulating water pipe 15, and the inlet of the pump 6 and the ejector 3 is connected by a circulating water pipe 16.
[0017]
Since the performance of the ejector 3 decreases as the driving water temperature rises, the heat exchanger 5 is provided in the middle of the driving water temperature, that is, the circulating water piping, and heat exchange is performed with the cold heat obtained by the refrigerator of the refrigeration system 7. This prevents the drive water temperature from rising.
[0018]
Drain can be supplied to the bottom of the vacuum chamber 1 via a drain supply strainer 21, an electromagnetic valve 22 and a drain supply pipe 23, and waste liquid in the vacuum chamber 1 is discharged into a waste liquid discharge pipe 25 and an electromagnetic valve 26. In addition, the liquid can be discharged through the waste liquid discharge pipe 27.
[0019]
An electric heater 28 for raising the temperature of the drain is provided inside the vacuum chamber 1. The electric heater 28 may be provided along the outer wall of the vacuum chamber 1, or a heater in place of the electric heater may be used.
[0020]
A concentrated waste liquid discharge pipe 31 is connected to the concentrated waste liquid discharge port 30 in the middle portion of the side wall of the vacuum chamber 1, and communicated with the waste liquid discharge pipe 27 through the electromagnetic valve 32 and the discharge pipe 33.
[0021]
Reference numeral 35 denotes a float switch box provided in the vacuum chamber 1, and a float switch 36 for detecting the drain liquid level in the vacuum chamber 1 is provided inside the float switch box 35.
[0022]
A recovery pipe 37 is inserted into the water tank 4 from above, and communicates with the bottom of the float switch box 35 via a solenoid valve 38 and a recovery pipe 39. The recovery pipe 37 may be inserted from the side wall portion of the water tank 4.
[0023]
A treated water discharge pipe 41 is connected to the bottom of the water tank 4. In the middle of the discharge pipe 41, the liquid level of the treated water in the water tank 4 can be set. Reference numeral 42 denotes a float switch provided in the water tank 4.
[0024]
As shown in FIG. 2, reference numeral 45 denotes a nozzle provided at the upper portion of the side wall in the tangential direction with respect to the inner peripheral surface of the vacuum chamber 1 with the discharge port as the inside. Although one nozzle 45 is shown by the solid line, a plurality of nozzles may be arranged at equal intervals as shown by the dotted line.
[0025]
A cleaning pipe 46 is connected to the circulating water pipe 13 connecting the ejector 3 and the water tank 4, and the cleaning pipe 48 is connected to the nozzle 45 via an electromagnetic valve 47.
[0026]
Reference numeral 18 denotes an electromagnetic valve for opening the vacuum chamber 1 provided in the pipe 19 connected to the distillation pipe 12 connecting the throat of the cooler 2 and the ejector 3 to the atmosphere.
[0027]
The electromagnetic valve 22 opens and closes depending on the setting position of the float switch 36. That is, in FIG. 1, the position of the upper base in each triangle indicates the set position, and when the drain liquid level H in the vacuum chamber 1 matches the set position of the lower triangle, the solenoid valve 22 opens and supplies drain. When the liquid level H of the drain in the vacuum chamber 1 coincides with the upper triangular set position, the electromagnetic valve 22 is closed and the supply of the drain is stopped.
[0028]
The opening and closing of the solenoid valve 26 is set by a control device (not shown), and is opened when all drainage in the vacuum chamber 1 is periodically discharged as waste liquid. As an example, the discharge interval depends on the oil concentration of the drain. Is incorporated into the control device.
[0029]
Similarly to the setting of opening and closing of the solenoid valve 26, the solenoid valve 32 is set by a timer in a control device (not shown) so that the oil concentration of the floating oil in the vacuum chamber 1 reaches a certain value every certain time. Then, the floating oil is discharged, and the oil concentration of the drain in the vacuum chamber 1 is suppressed to a certain value or less.
[0030]
Prior to oil-water separation, the water tank 4 is filled with appropriate water until water flows from the treated water discharge pipe 41. Then, the pump 6 is operated to shift to automatic operation. When the treated water in the water tank 4 is circulated by the operation of the pump 6 through the path of the circulating water pipe 14 -the heat exchanger 5 -the circulating water pipe 15 -the pump 6 -the circulating water pipe 16 -the ejector 3 -the circulating water pipe 13, Since the distillation pipes 11 and 12 and the cooler 2 are sucked in the ejector 3, the vacuum chamber 1 is decompressed.
[0031]
Then, the solenoid valve 22 is opened, and drainage, which is an oil / water mixture, is introduced into the vacuum chamber 1 from the strainer 21 and the drain supply pipe 25. When a desired amount of drainage is introduced, the solenoid valve 22 is closed to stop introduction.
[0032]
Thereafter, when the temperature of the drain is raised by the electric heater 28, the pressure in the vacuum chamber 1 is reduced, so that the drain boils at a temperature of 100 degrees or less, and the moisture starts to evaporate.
[0033]
Drain introduction is started on a control device (not shown), but thereafter, the operation shifts to automatic operation by the control device, and water evaporated in the vacuum chamber 1 due to suction of the ejector 3 is returned to water by the cooler 2 to When the float switch 36 detects that the water level in the vacuum chamber 1 has been recovered and the drain level in the vacuum chamber 1 has dropped, the electromagnetic valve 22 is opened to introduce and replenish the vacuum chamber 1 with drain.
[0034]
By collecting drain water in the water tank 4, the amount of water in the water tank 4 rises, but the upper limit position is determined by the start-up setting position of the treated water discharge pipe 41, and the amount of water exceeding this set position is discharged from the treated water. It flows out from the pipe 41.
[0035]
By repeating the above operation, drainage in the vacuum chamber 1 is concentrated, and the liquid whose oil concentration is increased floats on the liquid surface in the vacuum chamber 1 due to the difference in specific gravity. When the float switch 36 is operated under the liquid level condition above the concentrate discharge port 30, a control device (not shown) stops the device, opens the electromagnetic valve 18 to open the vacuum chamber 1 to the atmosphere, and releases the electromagnetic valve 32. And the floating oil in the vacuum chamber 1 is discharged from the concentrate discharge port 30 through the discharge pipe 31, the solenoid valve 32, the discharge pipe 33, and the waste liquid discharge pipe 24.
[0036]
The inside of the float switch box 35 communicating with the vacuum chamber 1 is contaminated with dust and floating oil contained in the drain, and the operation of the float switch 36 is obstructed. Therefore, the solenoid valve 38 is periodically controlled by a timer of a control device (not shown). Since the vacuum chamber 1 is in a depressurized state for a certain period of time, when the electromagnetic valve 38 is opened, the treated water in the water tank 4 passes through the recovery pipe 37 -the electromagnetic valve 38 -the recovery pipe 39 and the float switch box. The dust containing the oil adhering to the float switch box 35 is washed away and flows out to the vacuum chamber 1 from the communication line connecting the vacuum chamber 1 and the float switch box 35, so that the float switch 36 is in a normal operation state. To maintain.
[0037]
Since the inside of the vacuum chamber 1 is also contaminated by dust and floating oil contained in the drain, the solenoid valve 47 is periodically opened for a certain time by a timer of a control device (not shown). Circulating water flowing through the circulating water pipe 16 is pressurized by the pump 6, and the vacuum chamber 1 is in a depressurized state, and a part of the circulating water flowing through the circulating water pipe 13 when the electromagnetic valve 47 is opened. Flows into the cleaning pipe 46 and is ejected from the nozzle 45 into the vacuum chamber 1 through the electromagnetic valve 47 and the cleaning pipe 48.
[0038]
The water flow ejected in the inner circumferential tangential direction of the vacuum chamber 1 swirls along the inner wall of the vacuum chamber 1 as shown in FIG. 2, and evenly removes oil adhering to the inner wall of the vacuum chamber 1. The liquid containing dirt is mixed with the concentrated drain in the vacuum chamber 1 and discharged from the waste liquid discharge pipes 25 and 27 when the electromagnetic valve 26 is opened.
[0039]
When the treated water in the water tank 4 is diverted to the cleaning pipe 46 and the water level drops, and the float switch 42 detects the liquid level, the control device (not shown) closes the electromagnetic valve 47 and the cleaning of the vacuum chamber 1 is completed. To do. While the solenoid valve 47 is open for a certain period of time before the solenoid valve 47 is opened, the operation of the refrigerators of the cooler 2 and the refrigeration system 7 is stopped so that the circulating water rises to a desired temperature. When ejected, the vacuum chamber 1 is in a depressurized state, so that the cleaning water ejected from the nozzle 45 boils while swirling, and oil attached to the inner wall of the vacuum chamber 1 is peeled off by the kinetic energy of the bubbles generated by the boiling. Cleaning is performed efficiently.
[0040]
If a program is incorporated so that the solenoid valve 47 is periodically opened by a control device (not shown), the vacuum chamber 1 is automatically cleaned without being disassembled, and high oil / water separation performance is maintained over a long period of time. be able to.
[0041]
The present invention is not limited to the above embodiment. In the hot water separation apparatus according to the embodiment, the ejector is not used as the pressure reducing means of the vacuum chamber, and the water obtained by the oil / water separation is not stored as treated water in the water tank. The washing water to be ejected may be obtained from an appropriate washing water supply system through a valve having a function equivalent to that of the electromagnetic valve 47.
[0042]
【The invention's effect】
As described above, according to the present invention, it is possible to obtain an oil / water separator that can automatically clean the inside without disassembling the vacuum chamber and can maintain a highly reliable function and performance for a long time.
[Brief description of the drawings]
FIG. 1 is a schematic piping system diagram of an oil / water separator according to an embodiment of the present invention.
FIG. 2 is a diagram showing a state in which cleaning is performed in the vacuum chamber of the oil / water separator in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Vacuum chamber 2 ... Cooler 3 ... Ejector 4 ... Water tank 5 ... Heat exchanger 6 ... Pump 7 ... Refrigeration system 11, 13 ... Distillation piping 13-16 ... Circulating water piping 22, 26, 32, 38, 47 ... Solenoid valve 28 ... electric heaters 36,42 ... float switch 45 ... nozzles 46,48 ... cleaning piping

Claims (5)

In the oil-water separator that introduces the oil-water mixture into the vacuum chamber, heats the oil-water mixture introduced while reducing the pressure in the vacuum chamber, and separates the oil and water by boiling the oil-water mixture under reduced pressure.
A nozzle that discharges fluid in a tangential direction is provided on the side wall of the vacuum chamber with the discharge port as an inner side, and the inner wall of the vacuum chamber is cleaned with the fluid discharged from the discharge port of the nozzle. Oil-water separator. In the oil-water separator according to claim 1,
An oil-water separator characterized in that water separated from oil in the vacuum chamber and stored in a water tank is used as a fluid discharged from the discharge port of the nozzle. In the oil-water separator according to claim 2,
A water tank, a pump, and an ejector are connected by piping to provide a circulation path, the vacuum chamber and the ejector throat are connected by piping, and the vacuum is generated by the reduced pressure generated in the ejector throat by water flowing through the circulation path. An oil-water separator characterized in that the chamber is decompressed and a part of the water flow flowing through the circulation path is used as a fluid discharged from the discharge port of the nozzle. In the oil-water separator according to claim 3,
A cooling means is provided in the middle of the pipe connecting the vacuum chamber and the ejector throat, and a cooling means for cooling the water flowing through the circulation path is provided in the circulation path. The oil-water separator is characterized in that cooling of water flowing through the circulation path is stopped while a part of the fluid is used as a fluid discharged from the discharge port of the nozzle. In the oil-water separator according to claim 2,
A switch for detecting that the liquid level of the water tank has been lowered is provided, and when the switch detects a drop in the liquid level, the discharge of fluid from the discharge port of the nozzle is stopped. Oil-water separator.

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