JP5548412B2 - Oil / water separator - Google Patents

Description

  The present invention relates to an oil / water separator for separating oil and water from a mixed liquid of oil and water, and more particularly to an oil / water separator using a floating separation method using fine bubbles.

  As a separation apparatus based on a floating separation method using fine bubbles, a method of processing via a plurality of tanks as described in Patent Document 1 below, and a single tank as described in Patent Document 2 There is a way to do it.

Japanese Patent No. 3092013 Japanese Patent No. 4117165

  In the said patent document 1, in order to make complicated control unnecessary, it is necessary to use a some tank.

  In Patent Document 2, the process of sucking the liquid to be processed, the process of separating oil and water, and the process of draining the processed liquid are performed by controlling the solenoid valve and the pump for processing in one tank.

  In these prior arts, a large-scale apparatus and complicated control are required to perform from the input of the liquid to be processed to the drainage of the processed liquid and the discharge of the floating oil.

  Therefore, an object of the present invention is to provide an oil / water separation apparatus that performs from the input of the liquid to be processed to the drainage of the processed liquid and the discharge of the floating oil in one tank without complicated control.

  Another object of the present invention is to provide a compact oil-water separator that enables the recovery of floating oil with a simple configuration.

  Means for achieving any of the above objects will be described below.

To achieve the above object, by supplying air, pressurized by the pump by dissolving air into the liquid to be treated, then blowing with the liquid to be treated air was dissolve as bubbles in the liquid to be treated, the processing In the oil-water separator that floats the oil contained in the liquid to be treated together with bubbles in the tank and separates the liquid to be treated into water and oil, in the present invention, in the present invention, , provided at a lower portion than said supply port, to the feed direction of the liquid to be treated from the supply port, a nozzle for blowing radially the bubble and the liquid to be treated in general horizontal direction, it is provided on the lower than 該No nozzle position A drain outlet, an external drain outlet provided at a position higher than the drain outlet and lower than the upper end of the treatment tank, and a drain pipe connecting the drain outlet and the external drain outlet are provided.

In the above-described configuration of the present invention, more preferable specific embodiments are as follows.
(1) It has a supply port for supplying the liquid to be processed to the processing tank from above.
(2) A floating oil recovery mechanism is provided in the treatment tank, and the upper end of the floating oil recovery opening of the floating oil recovery mechanism is positioned higher than the external drainage port.
(3) The floating oil recovery opening is movable up and down.
(4) An oil drain pipe extending downward from the floating oil recovery opening and an oil exhaust port for discharging oil flowing down the oil drain pipe, the oil drain pipe being fixed to the treatment tank, and the oil drain pipe And the floating oil recovery opening are connected by a partition member of the movable body.
(5) The floating oil recovery opening has a float having a specific gravity smaller than that of water and greater than that of oil on the liquid surface of the treatment tank, and is used as a floating oil recovery opening of the floating oil recovery mechanism.
(6) A float having a specific gravity smaller than that of oil and a specific gravity greater than that of the oil, and an oil drain pipe serving as a flow passage for the oil recovered by the floating oil recovery mechanism, and the liquid to be processed in the processing tank and the oil exhaust pipe Connecting a partition member to the float;
(7) The drain pipe has an upper end lower than the treatment tank and is disposed adjacent to the treatment tank.

  ADVANTAGE OF THE INVENTION According to this invention, the oil-water separation method and oil-water separation apparatus which perform from the injection of a to-be-processed liquid to the drainage of a processed liquid, and discharge | emission of floating oil without complicated control can be provided. Alternatively, the floating oil can be collected with a simple configuration, and a compact oil-water separator can be provided.

1 is an overall system diagram of an oil / water separator according to an embodiment of the present invention. It is a figure which shows the example which applied the oil-water separator to the compressor drain.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall system diagram showing a main part of the oil / water separator according to the present embodiment.

  The oil / water separator of this embodiment includes a treatment tank 1 in which a liquid to be treated (drain) to be subjected to oil / water separation is stored, and by supplying fine bubbles to the drain stored in the treatment tank 1, It is configured to float oil.

  A suction port 6 is provided at the bottom of the processing tank 1, and a pipe 7 a is connected to the suction port 6. The pipe 7a is connected to the pump 2, and the downstream side of the pump 2 is connected to the processing tank 1 through the pipe 7b. That is, the pipes 7a and 7b are partial pipes constituting the circulation pipe.

  An intake pipe 4 to which air is supplied from the outside is connected to the pipe 7a. One end of the intake pipe 4 is connected to the partial pipe 7a on the upstream side of the pump 2, while the other end side, that is, the opening end for taking in air is adjusted to the amount of air necessary for generating fine bubbles. An air amount adjusting valve 3 is provided for opening the liquid at a position higher than the uppermost liquid level of the liquid to be processed stored in the processing tank 1.

  A nozzle 5 for supplying bubbles to the processing tank 1 is provided at the downstream end of the pipe 7b. The nozzle 5 is of a type that pressurizes the inside of the pipe 7b with an aperture stop and injects the liquid to be treated radially.

  With the above configuration, when the pump 2 is driven, an appropriate amount of air is sucked into the pipe 7a through the air amount adjusting valve 3 and the intake pipe 4, and pressurized by the pipe 7b. Air dissolved in the liquid is ejected from the nozzle 5. At this time, fine bubbles are supplied into the processing tank 1 by reducing the pressure to atmospheric pressure. As a result, oil / water separation of the drain in the processing tank 1 is performed.

  The liquid to be processed is supplied into the processing tank 1 from a supply port 11 provided in the upper part of the processing tank 1. When drainage is stored in the treatment tank 1 and an oil-water separation operation for driving the pump 2 is performed, the oil in the drain floats above the liquid to be treated. Recovery of the oil component that has floated by the oil-water separation operation is performed by a floating oil recovery mechanism (indicated by reference numerals 12, 13, 14, and 16).

  The floating oil recovery mechanism will be described. The floating oil recovery mechanism according to the present embodiment is provided in the processing tank 1 and includes a drain pipe 12 that serves as a discharge path for recovered oil, a float 14 that functions as an opening that guides the floating oil to the drain pipe 12, and a drain pipe. 12 and the float 14, and a partition member 13 that partitions the liquid to be treated and the oil discharge path in the processing tank 1, and an oil discharge port 16 that discharges the recovered oil led to the oil drain pipe 12 to the outside. It is prepared for. By these recovery mechanisms, the separated oil is discharged to the outside.

  On the other hand, the treated liquid from which the oil component has been separated is drained from the external drainage port 10 to the outside through the water distribution pipe 9 from the drainage port 8 provided in the lower part of the treatment tank 1. The structure of the drain port 8, drain pipe 9, and external drain port 10, especially the positional relationship will be described later, but the oil / water separator according to this embodiment maintains the water level of the liquid to be treated in the treatment tank 1 constant. Since it is the purpose, the external discharge port 10 is set to a height that satisfies this.

  By providing the said structure, oil is collect | recovered as follows. The separated and floated oil (reference numeral 15 in FIG. 1 indicates the floated oil) is guided from the float 14 to the oil drain pipe 12. The oil drain pipe 12 of the present embodiment is formed so as to rise upward from the bottom of the treatment tank 1. Therefore, when the oil level of the floating oil is higher than the opening of the float 14 that is the starting end of the oil drain passage, the floating oil is discharged. It will flow down to the oil pipe 12.

  Since the specific gravity of the floating oil is lighter than that of water, the oil level in the treatment tank 1 is higher than the height of the reference external discharge port 10 (indicated by a broken line in FIG. 1). Therefore, by setting the opening height at the upper end of the float 14 higher than the broken line in FIG. 1, the separated floating oil can be efficiently recovered.

  Even if the liquid to be treated is supplied from the supply port 11 to the treatment tank 1, water is discharged from the external discharge port 10 by the amount of supply, so that the liquid level in the treatment tank 1 is kept almost constant, but temporarily Fluctuations can occur and are not necessarily constant in the short term. Therefore, the following configuration is employed in the present embodiment.

  The float 14 is made of a material having a specific gravity of 0.9. That is, a material having a specific gravity intermediate between the liquid to be treated (specific gravity: about 1.0) and the floating oil (specific gravity: about 0.85) before oil-water separation is used. Accordingly, the float 14 floats on the liquid in the liquid to be treated before oil-water separation, but sinks in the floating oil. For this reason, the oil in a position higher than the opening of the float 14 is discharged from the floating oil discharge port 16 through the oil discharge pipe 12.

  Moreover, in order to enable the float 14 to move up and down, the partition member 13 is configured to be extendable and contractible. For example, a film-like movable body, a bellows-like member, and the like are suitable. As a result, the float 14 does not open to the liquid to be treated or the water after separation, and is always within the accumulation range of the floating oil 15 even if the opening is located within the liquid surface. Therefore, the floating oil 15 can be reliably recovered by the floating oil recovery mechanism.

  Next, the route (drainage route) of the treated liquid from which the oil component has been separated will be described. A drain port 8 is provided in the lower part of the treatment tank 1. The position of the drainage port 8 is a position sufficiently separated from the supply port 11 to which the liquid to be treated is supplied and the float 14 from which the floating oil is recovered. Moreover, it is necessary to set the position at least lower than the nozzle 5 so that the oil floating by the oil / water separation operation is not discharged. In this embodiment, it arrange | positions below the bottom part of the processing tank 1. FIG. Of course, it may be provided at the bottom of the treatment tank 1.

  Since the position of the external drain 10 is related to the liquid level of the processing tank 1 as described above, it is lower than the upper end of the processing tank 1 and high enough to store the liquid to be processed in the processing tank 1 sufficiently. Is set. For this reason, the drain pipe 9 which connects the drain port 8 and the external drain port 10 has a shape extending vertically. Although the size (volume, etc.) of the water distribution pipe 9 is not particularly problematic, it is arranged adjacent to the treatment tank 1 because it extends from the lower part of the treatment tank 1 to the height of the external discharge port 10 that serves as a liquid level reference. By doing so, the whole apparatus can be made compact.

  Next, an example in which the oil / water separator according to this embodiment is applied will be described. FIG. 2 is a diagram showing an embodiment when applied to a drain purification process of an air compressor. Although there are many configurations common to those in FIG. 1, the same reference numerals are given to them and description thereof is omitted.

  Since the compressed air discharged from the compressor 30 is cooled by the dryer 31, condensed moisture is generated. This is the drain. The drain is discharged to the outside by the pressure of the compressed air from the drain discharger 32, and the compressed air from which the drain has been removed is supplied to the equipment of the compressor user.

  In particular, in the oil supply type air compressor, the oil mixed in the compressed air is separated, but cannot be completely removed. Therefore, the oil discharged from the drain discharger 32 is also mixed. Therefore, the drain can be collected by connecting the discharge pipe from the drain discharger 32 to the supply port 11 of the oil / water separator according to the present embodiment.

  The drain discharger 32 is generally operated intermittently so that a certain amount of drain is stored and then discharged, and the liquid level in the treatment tank 1 temporarily rises due to the resistance of the drain port 8 and drain pipe 9. At this time, since the float 14 can move up and down as described above, the float 14 follows the fluctuation of the liquid level by the movable partition member 13. Therefore, the supplied drain does not flow out to the oil drain pipe 12.

  The capacity of the processing tank 1 is determined by the amount of drain supplied, and is appropriately 1 to 2 times the processing amount per hour, that is, the amount of drain generation. The capacity of the pump 2 and the air flow rate can also be calculated based on the throughput per hour.

  When drain is discharged from the drain discharger 32, the control panel 17 receives the input signal 18, issues an output signal 19 to the pump 2, and controls the operation of the pump 2 to perform the oil-water separation operation. The floating oil 15 collected on the liquid surface of the treatment tank 1 by the oil / water separation operation is automatically discharged through the float 14, the partition member 13, and the oil drain pipe 12, so that the floating oil recovery tank 20 is provided at the oil discharge port 16. It can be collected by installing.

  The treated water separated in the treatment tank 1 is discharged from the external drain port 10, but since the drain port 8 and the water pipe 9 are not completely separated from the treatment tank 1, a small amount of oil is discharged. Considering the above, it is preferable to install the rear filter 21 provided with the oil adsorbent 22 inside. Thus, in the above-described embodiment of the present invention, a floating oil recovery mechanism that recovers only the floating oil using the difference in specific gravity of oil and water is provided in the upper part of the processing tank 1 that performs floating separation by fine bubbles. It was. Further, the liquid to be treated supplied into the treatment tank 1 is supplied from the upper part of the treatment tank, and the treated liquid separated from the oil and water is supplied into the treatment tank 1 from the treatment water outlet (drain port 8) provided at the lower part of the treatment tank. The water is drained through a drain pipe 9 raised to the level of the liquid.

  With these configurations, the floating oil 15 generated by the floating separation can be recovered without power from a pump or the like, and the oil / water separation and the floating oil recovery can be performed in one tank because the structure is simple. In addition, by separating the inlet of the liquid to be processed (supply port 11) and the outlet of the processed liquid (drainage port 8), and further raising the drainage pipe 9 to the liquid level of the treatment tank 1, the floating separation operation by the circulation pump Only the treated liquid can be drained in a state where the liquids are not mixed with each other.

  DESCRIPTION OF SYMBOLS 1 ... Processing tank, 2 ... Pump, 3 ... Air quantity adjustment valve, 4 ... Intake piping, 5 ... Nozzle, 6 ... Suction port, 7 ... Circulation piping (7a ... Piping, 7b ... Piping), 8 ... Drain port, 9 DESCRIPTION OF SYMBOLS ... Drain pipe, 10 ... External drain port, 11 ... Supply port, 12 ... Oil drain pipe, 13 ... Partition member, 14 ... Float, 15 ... Floating oil, 16 ... Oil discharge port, 17 ... Control panel, 18 ... Input signal, DESCRIPTION OF SYMBOLS 19 ... Output signal, 20 ... Floating oil collection tank, 21 ... Rear filter, 22 ... Oil adsorption material, 30 ... Compressor, 31 ... Dryer, 32 ... Drain discharger.

Claims (9)

Supplying air to the liquid to be treated, pressurized by a pump by dissolving air into the liquid to be treated, by blown air was dissolve inside the processing tank along with the liquid to be treated as a bubble, to be processed in said processing tank In an oil-water separator that floats oil contained in the liquid together with air bubbles and separates the liquid to be treated into water and oil,
A supply port for supplying a liquid to be treated from above the treatment tank;
A nozzle that is provided below the supply port, and blows out the bubbles and the liquid to be processed radially in a substantially horizontal direction with respect to the supply direction of the liquid to be processed from the supply port;
Connecting a 該No nozzle position drain outlet provided in the lower portion than the external drain port a position higher than the exhaust water outlet is provided at a position lower than the processing tank upper, the exhaust water outlet and the external drainage port An oil-water separator having a drain pipe to perform. The oil-water separator according to claim 1, further comprising a floating oil recovery mechanism in the treatment tank, wherein an upper end of a floating oil recovery opening of the floating oil recovery mechanism is positioned higher than the external drainage port. Oil-water separator. 3. The oil / water separator according to claim 2 , wherein the floating oil recovery opening is vertically movable. The oil-water separator according to claim 2 or 3, comprising an oil drain pipe extending downward from the floating oil recovery opening, and an oil outlet for discharging oil flowing down the oil drain pipe.
The oil / water separator is characterized in that the oil drain pipe is fixed to the treatment tank, and the oil drain pipe and the floating oil recovery opening are connected by a partition member of a movable body. In the oil-water separator according to any one of claims 2 to 4, the該浮upper oil collecting apertures liquid level of the processing tank, it has a larger float specific gravity than the specific gravity is less oil than water, on該浮An oil-water separator characterized by being used as a floating oil recovery opening of an oil recovery mechanism. The oil-water separator according to claim 3 ,
A float having a small specific gravity and a larger specific gravity than oil, and an oil drain pipe serving as a flow passage for the oil recovered by the floating oil recovery mechanism,
An oil-water separator in which a partition member that partitions the liquid to be treated in the treatment tank and the oil drain pipe is connected to the float. In the oil-water separator according to any one of claims 1 to 6 ,
The drainage pipe has an upper end lower than the treatment tank and is disposed adjacent to the treatment tank. The oil-water separator according to any one of claims 1 to 7, wherein the drain pipe extends in a vertical direction. The oil / water separator according to any one of claims 1 to 8, wherein the treatment tank has a shape whose height is larger than a length in a blowing direction from the nozzle. .

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