JP2015155092A - Emulsion demulsification device and demulsification method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method capable of efficiently separating, for example, an emulsion (emulsified liquid) in which an oil and a cleaning fluid are mixed into the oil and the cleaning fluid.

SOLUTION: A emulsion demulsification device comprises: a tank; a microbubble generator installed in the tank; a feeding device for feeding a waste fluid outside the tank or a fluid inside the tank, or both fluids to the microbubble generator; and a gas feeding device for feeding gas such as air to the microbubble generator. The microbubble generator is a revolving and shearing type microbubble generator, which demulsifies emulsion in the fluid near the outlet of the microbubble generator by using microbubbles exited from the microbubble generator, separates the fluid into at least two kinds of fluid having no affinity with each other, and makes one fluid float with the microbubbles.

COPYRIGHT: (C)2015,JPO&INPIT

Description

  The present invention relates to an emulsion demulsifying apparatus and a demulsifying method that can be used when, for example, an emulsion (emulsified liquid) in which a cleaning liquid and oil are mixed is separated into a cleaning liquid and oil.

  In order to remove the oil adhering to the product in the process of making a product by bending or cutting a metal plate, etc., the product is put in the washing tank, the washing liquid is flowed, and the product is Washing is done. When the product is repeatedly washed, the washing liquid and oil mix to become an emulsion, and the ability as a washing liquid deteriorates.

  As a method and apparatus for recovering floating oil from waste liquid, as shown in Japanese Patent Application Laid-Open No. 2007-38195 (Patent Document 1), microbubbles are fed into waste liquid containing foreign matters, mainly oil, including emulsion. It has been known that foreign matter, mainly oil, adheres to the surface of the microbubble until the microbubble rises to the surface of the water to make it floating oil, and this floating oil is recovered.

  JP 2007-38195 A

The one described in Patent Document 1 is a method and apparatus for recovering floating oil from waste liquid and uses microbubbles to recover the oil, but there is no description about demulsifying the emulsion.
An object of the present invention is to provide an emulsion demulsification apparatus and a demulsification method capable of continuously and efficiently separating, for example, an emulsion (emulsion liquid) in which a cleaning liquid and an oil are mixed into an oil and a cleaning liquid. .

  The emulsion demulsification apparatus of the present invention supplies a tank, a microbubble generator installed in the tank, a liquid containing an emulsion existing outside, a liquid in the tank, or both to the microbubble generator. And a gas supply device that supplies a gas body such as air to the microbubble generator, wherein the microbubble generator is a swirling shear type microbubble generator, and the microbubble generator The emulsion in the liquid is de-emulsified near the outlet of the microbubble generator by a shearing force when bubbles are generated, and separated into at least two liquids having no affinity for each other

Further, the microbubble generator is a cylindrical body, the liquid and the gas supplied from the liquid supply device and the gas supply device are a high-speed swirling flow in the cylindrical body, and the swirling flow is generated on the inner wall at the tip of the cylindrical body. The present invention is characterized in that a diameter-enlarged portion is provided in which the diameter of the passage that has passed through is partially enlarged.
Further, the microbubble generator is a cylindrical body, and the liquid and gas supplied from the liquid supply device and the gas supply device are turned into a high-speed swirling flow in the cylindrical body, and the diameter of the outlet is set at the outlet of the cylindrical body. A ring provided with a partially enlarged diameter enlarged portion is attached.

In addition, a pair of the microbubble generators are installed in close proximity with their tips facing each other.
Further, the inner diameter of the cylindrical body is reduced from the middle toward the tip.

  Further, the cleaning liquid regenerating apparatus of the present invention comprises a tank, a microbubble generator installed in the tank, a waste liquid after product cleaning containing an emulsion of oil and cleaning liquid existing outside, a liquid in the tank or A liquid supply device that supplies both of them to the microbubble generator; and a gas supply device that supplies a gas body such as air to the microbubble generator. The emulsion in the liquid is de-emulsified near the outlet of the microbubble generator by a shearing force when microbubbles are generated from the microbubble generator, and the separated oil is floated together with the generated microbubbles. And the remaining liquid is regenerated as a cleaning liquid.

Further, the emulsion demulsification method of the present invention generates an emulsion composed of at least two kinds of liquids having no affinity for each other by the shearing force generated when microbubbles are generated in a swirling shear type microbubble generator. An emulsion demulsification method comprising demulsifying near the exit of a body.
Further, the microbubble generator is a cylindrical body, and the supplied liquid and gas are turned into a high-speed swirling flow in the cylindrical body, and the diameter of the passage through which the swirling flow passes to the tip of the cylindrical body is partially An enlarged diameter enlarged portion is provided.
In addition, a pair of the microbubble generators are installed in close proximity with their tips facing each other.

Further, the cleaning liquid regenerating apparatus of the present invention demulsifies an emulsion composed of at least a cleaning liquid and oil by a shearing force generated when microbubbles are generated in a swirling shear type microbubble generator near the outlet of the microbubble generator. The cleaning liquid is regenerated by removing the oil.
Further, a pair of swirl shear type microbubble generators that supply a gas body and a liquid to generate a high-speed swirl flow therein, and the tips of the pair of microbubble generators are installed in close proximity to each other, In the opposed portions, the swirl flows exiting from the pair of microbubble generators are canceled out.

  As described above, according to the demulsification apparatus and the demulsification method of the emulsion of the present invention, a sharp brake is applied to the swirling flow generated in the microbubble generating body, thereby generating a large pruning force when microbubbles are generated, At least two kinds of liquids having no affinity for each other in the emulsion can be separated and continuously, and the milk can be efficiently released.

  In addition, when the demulsification apparatus and the demulsification method of the present invention are used, the emulsion in the waste liquid can be de-emulsified, and as a result, the waste liquid can be reused as a cleaning liquid, and a cleaning agent regeneration apparatus and a regeneration method are provided. be able to.

  1 is a principle diagram of an emulsion demulsifying apparatus according to an embodiment of the present invention.   It is a sectional side view of the microbubble generating body used for the emulsion demulsification device.   It is a front view of the microbubble generating body.   It is a section side view of a part of the emulsion demulsification device.   It is a section side view of a part of the emulsion demulsification device.   It is a principle figure for description of the microbubble generating body.   It is a figure for description of the same microbubble generating body.   It is a sectional side view of other embodiments of the microbubble generating object.   It is C-C 'sectional drawing of FIG.   It is a cutaway side view of further another embodiment of the microbubble generating body.   It is a partial front view of the microbubble generator of FIG.   It is a cutaway side view of further another embodiment of the microbubble generating body.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, 1 is a tank of an emulsion demulsifier. This tank is divided into three rooms 3a, 3b, 3c by partition walls 2a, 2b. The rooms 3a, 3b, 3c are not completely separated, the rooms 3a and 3b are connected at the upper side, and the rooms 3b and 3c are connected at the lower side. A microbubble generator 4 is installed below the room 3a. The microbubble generator 4 is supplied with air 5 a from an air pump 5. In the embodiment, air is used, but a gas such as nitrogen gas may be used.

The microbubble generator 4 is further supplied with a waste liquid 7 stored in a tank 6 via a pump 8. The waste liquid 7 is a liquid obtained by cleaning a product processed with the cleaning liquid, and basically includes a cleaning liquid (including water and a surfactant) and an oily emulsion. When this emulsion increases, The effect is degraded.
At the same time, the liquid 10 in the tank 1 is sucked out by the pump 11 from the outlet 9 installed in the room 3 c and supplied to the microbubble generator 4. The liquid 21 can be supplied in three ways: both the waste liquid 7 and the liquid 10, only the waste liquid 7, and only the liquid 10. FIG. 1 shows a state where the emulsion is de-emulsified and separated into at least two liquids A and B having no affinity for each other. For example, the liquid A is an oil and the liquid B is a cleaning liquid, but the liquid B contains not only the cleaning liquid but also an emulsion containing oil.

  Since liquid A has a lower specific gravity than liquid B, liquid A is positioned above. This liquid A passes over the wall 2a and enters the room 3b from the room 3a. And it is taken out from the take-out port 12a. The extracted liquid A is stored in the tank 13. The room 3c is also provided with an outlet 12b, and the liquid B taken out therefrom is stored in the tank 14. As shown in FIGS. 4 and 5, the outlets 12a and 12b are configured such that the liquids A and B overflow the outlets 12a and 12b. Other means may be used as the liquid take-out means. The liquid reduced in the tank 1 is compensated by the waste liquid 7 being supplied.

Next, the microbubble generator 3 will be described.
There are a pressure compression method and a swirl shear method as methods generally known as means for generating microbubbles. The present invention is characterized in that the swirl shear method is used as the microbubble generator 4.
In this embodiment, a gas-liquid two-phase swirl shear method is used. FIG. 2 shows the structure of the microbubble generator 4. A cylindrical body 15 is provided, and the waste liquid 7 and the liquid 10 (both liquid 21 together) are supplied from the supply port 16 along the inner wall surface. The diameter of the cylindrical body 15 decreases from the middle toward the tip. And the front-end | tip part 17 has a complicated shape including the part (diameter enlarged part) where the diameter of the channel | path is large. For example, it is configured as shown in FIG. A supply port 18 for air 20 is provided at the rear end of the cylindrical body 15.

  The liquid 21 entering from the supply port 16 swirls along the inner wall surface of the cylindrical body 15 and becomes a high-speed swirling flow 19 as shown in FIG. Since the inner diameter of the cylindrical body 15 decreases from the middle toward the tip, the swirling flow 19 becomes faster as it goes to the tip of the cylindrical body 15. Then, a negative pressure is generated in the central part of the cylindrical body 15 by the centrifugal force. As shown in FIG. 7, the air 20 supplied from the supply port 18 mainly passes through the center of the cylinder. Near the inner wall of the cylindrical body 15, mainly water 22 in the liquid 21 passes, and an emulsion 23 of the water 22 and oil in the waste liquid 7 passes between the water 22 and the air 20 passing through the center of the cylinder. To do. The means for creating the swirl flow 19 includes means for supplying the liquid 21 along the inner wall surface of the cylindrical body 15 as described above, and a partition plate twisted at the rear part (the one for supplying the liquid 21) of the cylindrical body 15. There is a means to make a swirl flow with this partition plate.

  That is, light specific gravity gathers at the center of the cylinder, and a tornado-shaped swirling flow 19 is formed. The swirling flow moves to the tip portion 17 of the cylindrical body 15. Since the tip portion 17 includes a portion having an increased inner diameter, the swirling speed of the swirling flow 19 rapidly decreases here. In this state, the swirling flow 19 is ejected from the tip of the cylindrical body 15. At this time, the rotational speed is further attenuated by the liquid 10 around the tip of the cylindrical body 15. For this reason, a large rotational speed difference is generated between the high-speed rotational speed of the swirling flow 19 inside the cylindrical body 15 and the rotational speed when it exits the liquid 10. Due to this rotational speed difference, a shearing force is generated, and the vortex is continuously sheared.

  The surfactant is adsorbed on the oil in the emulsion 23 and is in a state of being renewed with water. When the above-described shearing force acts on the emulsion in this state, the surfactant is separated from the oil, and at the same time, fine bubbles, that is, microbubbles 24 are generated. That is, a large shearing force is generated when microbubbles are generated. The separated oil is adsorbed on the surface of the microbubble 24 and floats together with the microbubble to be in the state shown in FIG. The microbubbles 24 are mixed with outside air and disappear.

  Another embodiment of the microbubble generator 4 will be described with reference to FIGS. The same names as those in FIG. 2 will be described with the same numbers. The cylindrical body 15 is provided with supply ports 16 and 18. A partition wall 26 having a central hole 25 is provided in the middle of the cylindrical body 15, and a high-speed swirling flow that passes through the central hole 25 of the cylindrical body 15 between the central hole 25 and the outlet hole 27 of the cylindrical body 15 is rapidly generated. A plurality of attenuation plates 28 for attenuation are provided. The speed of the swirling flow is attenuated by the damping plate 28, and the same state as in FIG. 2 occurs.

Still another embodiment of the microbubble generator 4 will be described with reference to FIGS. In this embodiment, a ring 31 is provided at the tip instead of processing the tip 17 of the cylindrical body 15 into a complicated shape. As shown in FIG. 11, the ring 31 is formed with an outlet hole 29 in the center and a plurality of communication holes 30 around the ring hole. Due to this special shape, the speed of the swirling flow is attenuated in this portion. The same situation as in FIG. 2 occurs.

  FIG. 12 shows still another embodiment. In this embodiment, the tips of two cylindrical bodies 15 are opposed to each other. Then, since the spiral direction of the swirl flow 19 inside the two cylindrical bodies 15 is reversed, the swirl flow 19 coming out from the tip is canceled, and in principle there is no swirl flow. In other words, the swirling flow generated in the cylindrical body 15 is stopped due to sudden braking. As a result, a large pruning force is generated, and the surfactant is released from the oil in the emulsion 23, resulting in a milk-free state. The facing distance between the tips of the pair of cylindrical bodies 15 is a distance at which the swirling flow 19 exiting from the tips of the two cylindrical bodies 15 is canceled and the swirling flow 19 disappears. Although it depends on various conditions, about 10 mm is given as an example. The cancellation may be complete cancellation, but is not expected to be complete. Since this method eliminates the swirling flow 19 from the cylindrical body 15, a large shearing force can be obtained, and it can be used not only for demulsification of emulsion but also for various types.

As a means for generating microbubbles, there is a pressure compression method, but since this method does not generate a large shearing force when microbubbles are generated, the surfactant is less likely to be separated from the oil in the emulsion. I can not expect.
On the other hand, as described in FIG. 1, the waste liquid 7 is a liquid obtained by cleaning a product processed with a cleaning liquid, and basically includes an emulsion made of water and oil. The effect of. When the demulsification apparatus and the demulsification method of the present invention are used, the emulsion 19 in the waste liquid 7 is demulsified, and as a result, the waste liquid 7 is restored as a cleaning liquid and reused.

  The emulsion demulsification apparatus and the demulsification method of the present invention are useful when, for example, the cleaning liquid that has become waste liquid is regenerated and reused.

1, 6, 13, 14: Tanks 2a, 2b: Partition walls 3a, 3b, 3c: Room 4: Microbubble generator 5: Air pump 5a: Air 6: Tank 7: Waste liquid 8, 11: Pump 9: Extraction port 10: liquid 12a, 12b: outlet 15: cylindrical body 16, 18: supply port 17: tip 19: swirl flow 20: air 21: liquid 22: moisture 23: emulsion 24: micro bubble 25: central hole 26: partition Wall 27: Outlet hole 28: Damping plate 29: Outlet hole 30: Communication hole 31: Ring

Claims (11)

  A tank, a microbubble generator installed in the tank, a liquid supply apparatus that supplies liquid containing an emulsion existing outside or a liquid in the tank or both to the microbubble generator, and the microbubble A gas supply device for supplying a gas body such as air to the generator, wherein the microbubble generator is a swirling shear type microbubble generator, and a shearing force is generated when microbubbles are generated from the microbubble generator. An emulsion demulsifying apparatus, wherein the emulsion in the liquid is demulsified near the outlet of the microbubble generator and separated into at least two liquids having no affinity for each other.   The microbubble generator is a cylindrical body, and the liquid and gas supplied from the liquid supply device and the gas supply device are a high-speed swirling flow in the cylindrical body, and the swirling flow passes through the inner wall of the tip of the cylindrical body. 2. The emulsion demulsifying device according to claim 1, further comprising a diameter-enlarging part in which the diameter of the incoming passage is partially enlarged.   The microbubble generator is a cylindrical body, and the liquid and gas supplied from the liquid supply device and the gas supply device are turned into a high-speed swirling flow in the cylindrical body, and the diameter of the outlet is partially set at the outlet of the cylindrical body. The emulsion demulsifying device according to claim 1, further comprising a ring provided with a diameter-enlarged portion that is enlarged.   2. The emulsion demulsifying apparatus according to claim 1, wherein a pair of the microbubble generators are installed close to each other with their tips opposed to each other.   The emulsion demulsifying device according to claim 2, 3 or 4, wherein the inner diameter of the cylindrical body is reduced from the middle toward the tip.   Supply to the microbubble generator the waste liquid after washing the product containing the emulsion by the tank, the microbubble generator installed in the tank, and the oil and the cleaning liquid present outside, or the liquid in the tank. And a gas supply device that supplies a gas body such as air to the microbubble generator, wherein the microbubble generator is a swirling shear type microbubble generator, and the microbubble generator The emulsion in the liquid is de-emulsified near the outlet of the microbubble generator by a shearing force when bubbles are generated, and the separated oil is floated and removed together with the generated microbubbles, and the remaining liquid is used as a cleaning liquid. A cleaning liquid regenerating apparatus for regenerating.   An emulsion composed of at least two kinds of liquids having no affinity for each other by a shearing force generated at the time of microbubble generation of a swirling shear type microbubble generator is demulsified in the vicinity of the outlet of the microbubble generator. An emulsion demulsification method.   The microbubble generator is a cylindrical body, and the supplied liquid and gas are turned into a high-speed swirling flow in the cylindrical body, and the diameter of the passage through which the swirling flow passes through the tip of the cylindrical body is partially enlarged. 8. The emulsion demulsification method according to claim 7, further comprising a diameter enlarged portion.   The emulsion demulsification method according to claim 7, wherein a pair of the microbubble generators are placed close to each other with their tips facing each other.   The emulsion composed of at least the cleaning liquid and oil is demulsified near the outlet of the microbubble generator by the shearing force generated when microbubbles are generated in the swirling shear type microbubble generator, and the cleaning liquid is regenerated by removing the oil. And a cleaning liquid regeneration method.   A pair of swirl shear type microbubble generators for supplying a gas body and a liquid to generate a high-speed swirl flow inside are provided, and the ends of the pair of microbubble generators are installed in close proximity to each other, The microbubble generating method characterized in that the swirling flow exiting from the pair of microbubble generators is canceled out at a portion to perform.

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