JP3572584B2 - Oil-water separation method and oil-water separation device for drain water generated from compressed air - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an oil-water separation method and an oil-water separation device for drain water generated from compressed air. More specifically, the present invention relates to a method of separating drain water and oil in which minute oil is combined with water to emulsify drain water. The present invention relates to a technique for causing an emulsion to be broken to release a bond.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a technique relating to an oil-water separation method and an oil-water separation apparatus for drain water generated from compressed air, there have been many techniques for separating oil lighter than water and foreign substances heavier than water from dirty drain water.
[0003]
In addition, there were those based on filters, those based on oil adsorbents, those based on electrolysis, and those based on chemicals.
[0004]
Further, as a technique using an adsorbent with emulsion breaking particles, as disclosed in Japanese Patent Application Laid-Open No. 54-6352, an emulsion in wastewater is treated with a treatment material having an amine or the like adhered to a support. A method of separating oil and water by performing a two-stage treatment such as treatment with an oil adsorbent such as polypropylene after coarsening or destruction of particles has been disclosed.
[0005]
Further, as another technique using an adsorbent with emulsion breaking particles, as disclosed in Japanese Patent Application Laid-Open No. 2001-113269, an oil adsorbing layer composed of an oil adsorbent having a relatively small hydrophilicity and an emulsion treatment material are disclosed. Alternatively, there has been disclosed an oil-water separator in which a plurality of sets of emulsion decomposition layers made of an oil adsorbent having relatively high hydrophilicity are alternately stacked.
[0006]
[Problems to be solved by the invention]
However, such conventional methods for separating oil and water of drain water generated from compressed air have the following problems.
[0007]
First, the separation of oil from emulsified drain water, which is made up of minute oil combined with water, can be achieved by using the density difference between water and oil or foreign matter, by using a filter, or by using an oil adsorbent. With such a simple device, it was almost impossible. In addition, clogging due to foreign matter is quick, and maintenance at that time is complicated.
[0008]
Secondly, electrolysis and chemicals required larger equipment and higher costs as the pursuit of perfection increased.
[0009]
Thirdly, if these methods are combined to form an oil / water separation device, the processing capacity including emulsion destruction will be improved, but the size of the device tends to be large and the cost tends to be high, creating an efficient device. Had a hard time.
[0010]
Fourth, in the two-stage treatment of emulsion destruction and oil adsorption shown in Japanese Patent Application Laid-Open Publication No. 54-6352, a specific flow is selected by selecting a channel through which drain water easily flows during oil adsorption treatment. In many cases, it was necessary to replace the adsorbent at an early stage through only the adsorbent of the portion. In addition, since the processing material for emulsion destruction has a higher resistance than the oil adsorbent, the capacity of the processing material for emulsion destruction was reduced to balance the two, but on the other hand, for the heavily soiled drain water, However, it is necessary to increase the capacity of the processing material for emulsion destruction. If the capacity is to be extremely increased, there is a problem in that when drain water flows, the resistance is not balanced.
[0011]
Fifth, in the oil-water separation apparatus disclosed in Japanese Patent Application Laid-Open Publication No. 2001-113269 in which a plurality of sets of the oil adsorbing layer and the emulsion decomposing layer are alternately stacked, the treatment material for breaking the emulsion is more resistant than the oil adsorbing material. Therefore, the thickness of the emulsion decomposition layer was reduced in order to balance the two according to the resistance when flowing.On the other hand, the thickness of the emulsion decomposition layer was reduced for highly contaminated drain water. It is necessary to increase the thickness, and when trying to make it extremely thick, there is a problem that the drain water flows out of balance in terms of resistance.
An object of the present invention is to solve such a problem.
[0012]
[Means for Solving the Problems]
The present invention provides an oil-water separation method in which a minute oil and water are combined to form an emulsified drain water . First , the drain water is passed through the filter element 22 that causes emulsion destruction, and then the adsorbent 32 with emulsion destruction particles to which emulsion destruction particles that cause emulsion destruction and oil adsorption are attached, and the oil adsorption material 33 that adsorbs oil. Is characterized by separating foreign substances centering on the oil contained in the drain water by passing through a substantially uniform mixture, and furthermore, the fine oil and water are combined to form an emulsion. It was at the oil-water separation method of the drain water, to remove oil to cause emulsion breaking unleashing the binding of water and oil, drain occurring from compressed air The, after first passing through a filter element 22 to cause the emulsion breaking, by passing through a further roughly uniformly mix the oil sorbent 33 for adsorbing emulsion breaking particles and oil to cause the emulsion breaking, The above problem has been solved by separating foreign matters centering on oil contained in the drain water.
[0013]
The present invention combines the oil and water of the fine at the oil-water separation apparatus of emulsified by drain water, in order to remove the oil to cause emulsion breaking unleashing the binding of water and oil, the foreign matter separated Te and extraneous matter catching tank 20 that constitutes the filter element 22 to cause the emulsion breaking, and an oil adsorbent 33 for adsorbing emulsion breaking and adsorbent 32 and the oil with the emulsion breaking particles make the oil adsorption were deposited emulsion breaking particles It is characterized in that an emulsion-breaking oil adsorption tank 30 housed in a state of being substantially uniformly mixed is provided. Further, in an oil-water separation device of drain water in which minute oil and water are combined and emulsified, A filter element that separates foreign substances and causes emulsion destruction in order to cause emulsion destruction that releases the bond between water and oil and to remove oil. And an emulsion-breaking oil absorption tank 30 containing the emulsion-breaking particles for causing emulsion breakage and the oil-adsorbing material 33 for adsorbing the oil in a substantially uniformly mixed state. characterized in that, further, the upstream of the foreign body capturing tank 20, characterized in that the oil separation chamber 10 for separating heavier than lighter oil or water than water foreign matter is disposed, further, the emulsion breaking oil adsorption The main body 31 of the emulsion breaking oil adsorption tank constituting the tank 30 is made of a transparent material from which the internal state can be visually observed from the outside. It is characterized in that a possible contamination degree checking means 11a is provided, and furthermore, a dye or the like is provided so as to block the flow of the drain water over the entire cross section substantially at the center of the emulsion breaking oil adsorption tank 30. By characterized by housing the activated carbon 34 to remove the odor, the above-mentioned problems are eliminated.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
An oil-water separation method and an oil-water separation device for drain water generated from compressed air according to the present invention will be described in detail with reference to the drawings.
Here, FIG. 1 is an overall view of an embodiment showing the present invention, and FIG. 2 is a detailed view of an emulsion breaking oil adsorption tank constituting an oil-water separation device of the present invention.
[0015]
As shown in FIG. 1, reference numeral 110 denotes an air compressor, which is not specifically shown but is composed of a motor and a compressor. By transmitting the rotation of the motor to the compressor, compressed air is produced while taking in the atmosphere. I have.
[0016]
Here, the compressed air created by the air compressor 110 is compressed air piping 201, aftercooler 120, compressed air piping 202, air tank 130, compressed air piping 203, dryer 140, compressed air piping 204 , Compressed air can be supplied to various pneumatic devices such as an air motor and an air cylinder via the filter 150 and the compressed air pipe 205.
[0017]
In this case, the compressed air is dried by the aftercooler 120 and the dryer 140, and various foreign substances such as oils and solids are removed by the filter 150, so that the dry compressed air is supplied to various pneumatic devices. You can do it.
[0018]
On the other hand, from the aftercooler 120, a drain discharge pipe 211 a, an openable / closable valve 221, a drain discharge pipe 211 b, an electric drain trap 222 for discharging drain water together with compressed air by any signal, and a drain discharge pipe A pipe 211c, a check valve 223 for preventing backflow from the downstream to the upstream, and a drain pipe 211d are connected to the collecting pipe 261 via a drain discharge pipe 211d, so that drain water can be discharged.
[0019]
From the lower part of the air tank 130 storing compressed air, a drain discharge pipe 212a, an openable valve 231 and a drain discharge pipe 212b are provided. Through a drain trap 232, a drain discharge 212c, a check valve 233 for preventing backflow from downstream to upstream, and a drain discharge pipe 212d, the drain pipe 212d is connected to the collecting pipe 261 at the uppermost stream and drain water is discharged. Can be discharged.
[0020]
Further, from the dryer 140, a drain discharge pipe 213a, a valve 241 that can be opened and closed, a drain discharge pipe 213b, an electric drain trap 242 that discharges drain water together with compressed air by any signal, and a drain discharge pipe 213c, a check valve 243 for preventing backflow from the downstream to the upstream, and a drain pipe 213d via a drain pipe 213d to connect to the collecting pipe 261 to enable drain water to be discharged.
[0021]
In addition, from the air filter 150, a drain discharge pipe 214a, a valve 251 that can be opened and closed, a drain discharge pipe 214b, an electric drain trap 252 that discharges drain water together with compressed air by any signal, and a drain A drain pipe 214c, a check valve 253 for preventing backflow from the downstream to the upstream, and a drain pipe 214d are connected to the collecting pipe 261 to allow drain water to be discharged.
[0022]
Here, from the collecting pipe 261, a check valve 265, a collecting pipe 262, and a valve 285 and a fresh water pipe 282 that can be opened and closed with the fresh water pipe 281 via the oil-water separator 1 that separates oil and various foreign substances are connected. Shimizu is discharged via the system. In this case, the check valve 265 allows the drain water to flow from the collecting pipe 261 to the collecting pipe 262, but does not cause the drain water to flow from the collecting pipe 262 to the collecting pipe 261. However, a configuration in which the check valve 265 is not provided is also conceivable. The fresh water discharged from the fresh water pipe 282 is so clean that it can be discharged to a river or the like as it is.
[0023]
In this case, the oil-water separation device 1 includes an oil separation tank 10, a foreign matter capturing tank 20, an emulsion-breaking oil absorption tank 30, and a fresh water confirmation tank 40. A connection pipe is provided between the oil separation tank 10 and the foreign matter capturing tank 20. 271, a check valve 275 and a connection pipe 272, a connection pipe 273 connects between the foreign matter catching tank 20 and the emulsion breaking oil absorption tank 30, and a connection between the emulsion breaking oil absorption tank 30 and the fresh water confirmation tank 40. They are connected by a tube 274.
[0024]
However, the foreign matter capturing tank 20 and the emulsion breaking oil absorbing tank 30 need not be limited to one each, and may be two, three, or more. In such a case, the foreign matter trapping tank 20 and the emulsion breaking oil adsorption tank 30 which are arranged in series one by one may be configured in parallel, It is also conceivable that a configuration in which a plurality of 30s are configured in parallel is configured in series.
[0025]
In this case, the oil separation tank 10 is partitioned by the partition wall 11d to form two chambers, an oil floating separation chamber 11x and a water storage chamber 11y, and the inside of the sealed oil separation tank main body 11 is separated from the liquid level at the upper part. In the upper part, only the compressed air, which is a gas, can enter and exit between the oil flotation / separation chamber 11x and the water storage chamber 11y. The space between the oil floating separation chamber 11x and the water storage chamber 11y can freely enter and exit from the bottom of the main body 11.
[0026]
The other pipe end of the suction pipe 11b projecting from the liquid level and having one pipe end connected to the collecting pipe 262 is located above the oil flotation separation chamber 11x, so that drain water flows into the suction pipe 11b. . Accordingly, in the oil floating separation chamber 11x, oil lighter than water floats on the liquid surface, and foreign substances heavier than water precipitate on the bottom. In this case, the oil floating on the liquid surface can be discharged by opening the floating oil discharge valve 13.
[0027]
On the other hand, in the water storage chamber 11y, one end of the discharge pipe 11c is positioned on the liquid surface, and the tip of the lower partition wall 11d between the oil floating separation chamber 11x and the water storage chamber 11y and the bottom of the oil separation tank main body 11 Drain water from which oil lighter than water and foreign matter heavier than water is removed from the portion communicating with the drain water flows in. However, the emulsified oil dissolved in the drain water and could not be separated by such a method and flowed as it was.
[0028]
Here, the other pipe end of the discharge pipe 11c is connected to the connection pipe 271. Therefore, the relatively clean drain water, which is located above one end of the discharge pipe 11c collected on the liquid level of the water storage chamber 11y and is free of oil, is located above the oil floating separation chamber 11x and the upper part of the water storage chamber 11y. The discharge pipe 11c enters from one pipe end and is sent to the connection pipe 271 together with the compressed air from the other pipe end by the pressure of the compressed air which is sealed in communication with the discharge pipe 11c. In order to control the pressure of the compressed air above the oil floating separation chamber 11x and the upper part of the water storage chamber 11y, a pressure gauge 12 is provided above the oil separation tank main body 11.
[0029]
As shown in FIG. 1, a transparent transparent tube 11 a is disposed on the outer periphery of the oil separation tank main body 11 in the up-down direction and communicates with the oil separation tank main body 11 at four locations including the upper end and the lower end. Is formed. In this case, the purpose of the transparent tube 11a is to confirm the state of the drain water contamination of the oil floating separation chamber 11x immediately after flowing into the oil floating separation chamber 11x by visual or optical means. It plays the role of the degree checking means 11a. Therefore, as a material of the transparent tube 11a, a transparent material such as glass or plastic can be considered.
[0030]
Note that the number of communication points between the transparent tube 11a and the oil separation tank main body 11 is not limited to four, but may be two, three, five, or more. Further, as a means for confirming the degree of contamination, an optical method of irradiating light and making a determination based on transmitted light or reflected light can be considered.
[0031]
Next, the foreign matter trapping tank 20 includes a foreign matter trapping tank main body 21, a filter element 22, and pressure gauges 23 and 24. In this case, the foreign matter trapping tank main body 21 is configured in a hermetically sealed state by a main body part and a lid part, and an inflow passage 21a and an outflow passage 21b are formed in the lid part of the foreign matter trapping tank main body 21. Pressure gauges 23 and 24 are connected to 21a and 21b.
[0032]
In this case, the pressure of the pressure gauges 23 and 24 is set to any value of 0.01 to 0.7 MPa together with the pressure of the pressure gauge 12 of the oil separation tank 10. However, the pressure loss due to the connection pipes 271 and 272 between the pressure gauges 12, 23 and 24 needs to be considered to some extent. Here, if the set pressure is too low, the drain water cannot be discharged as fresh water through the oil / water separator 1, and if the set pressure is too high, the drain water constitutes the oil / water separator 1. However, there will be a problem that a specific flow path is formed when passing through the emulsion breaking oil adsorption tank 30, which will be described later.
[0033]
Further, the filter element 22 is housed inside the main body part of the foreign matter trapping tank main body 21 and is fixed by the lid part of the foreign matter trapping tank main body 21. Therefore, the drain water from the oil separation tank 10 flowing into the foreign matter capturing tank 20 is always discharged from the foreign matter capturing tank 20 via the filter element 22 from outside to inside. When the drain water passes through the filter element 22, a part of the emulsified oil breaks the emulsion, releasing the bond between the water and the oil.
Here, the two pressure gauges 23 and 24 determine the replacement time of the filter element 22 based on the pressure difference. However, the foreign matter capturing tank 20 may not be installed.
[0034]
Further, in the emulsion-breaking oil adsorption tank 30, an activated carbon 34 for removing dyes and unpleasant odors is disposed in the emulsion-breaking oil adsorption tank main body 31 so as to block the flow of the drain water over substantially the entire cross section at the center. A mixture of the adsorbent 32 with the emulsion-breaking particles to which the emulsion-breaking particles are attached and the oil-adsorbing material 33 to adsorb the oil are almost uniformly mixed and stored before and after the activated carbon 34. .
[0035]
Here, the emulsion destruction oil absorption tank main body 31 is made of a transparent material such as glass or plastic from which the internal state can be viewed from the outside, or made of glass or the like so that the internal state can be viewed from the outside. It is also conceivable to insert a transparent material such as plastic.
[0036]
In this case, the adsorbent 32 with the emulsion-breaking particles releases the bond between the oil and water by breaking the emulsified drain water by the action of the minute oil combined with water by the action of the emulsion-breaking particles, and then separated. The oil is adsorbed by the adsorbent and the oil adsorbent 33 constituting the adsorbent 32 with emulsion destruction particles. Therefore, since the adsorbent 32 with the emulsion breaking particles and the oil adsorbent 33 are scattered, the oil can be completely separated from the emulsified oil and removed by adsorbing the oil.
[0037]
On the other hand, the granular activated carbon 34 is intended to adsorb and remove pigments and off-flavors. As for the position where the activated carbon 34 is filled in the emulsion-breaking oil adsorption tank 30, the activated carbon 34 is contaminated early in the uppermost stream, and the activated carbon 34 itself flows out in the lowermost stream, so that the contaminated water appears to flow. For this reason, it is desirable to be located at a substantially central portion.
[0038]
Here, the structure of the emulsion breaking oil adsorption tank main body 31 is such that the drain water as a liquid flows into the emulsion breaking oil adsorption tank main body 31 from the inlet 31a and is discharged from the outlet 31b. Spaces 31z are secured on the inlet side and the outlet side which are both ends of the emulsion breaking oil adsorption tank main body 31 so as to flow uniformly in the tank main body 31.
[0039]
Therefore, in order to secure the spaces 31z at both ends, two perforated plates 31c having a large number of small holes are prepared, and the perforated plates 31c and the ends at both ends of the emulsion-breaking oil adsorption tank main body 31 are prepared. The porous plate 31c is supported by disposing a cylindrical column 31d having a smaller diameter than the emulsion-breaking oil adsorption tank main body 31 therebetween, and the adsorbent 32 with emulsion-breaking particles, the oil adsorbent 33, and the activated carbon 34 are divided into two porous plates. 31c. However, the support 31d need not be limited to a cylindrical one at all, and may have any shape as long as the space 31z can be secured. In addition, as the porous plate 31c, a punching plate in which many small holes are formed, a ceramic resin, or the like can be considered.
[0040]
Further, the resistance of the adsorbent 32 with the emulsion breaking particles and the oil adsorbent 33 increases as it absorbs foreign substances such as oil, and is further compressed by being pressed downstream while being compressed. The function of oil destruction and oil adsorption deteriorates.
[0041]
Therefore, in order to prevent this even a little, an intermediate porous plate 31e having a number of small holes formed in the approximate center of the emulsion breaking oil adsorption tank main body 31 is arranged so that the flow of the liquid can be blocked vertically. In order to support the intermediate porous plate 31e, an adsorbent with emulsion breaking particles is provided between the intermediate porous plate 31e and the porous plate 31c by disposing a cylindrical support material 31f having a smaller diameter than the emulsion breaking oil absorption tank main body 31. 32 and the oil adsorbent 33 are prevented from being compressed.
[0042]
However, the position of the intermediate perforated plate 31e may be slightly around the center of the emulsion breaking oil adsorption tank main body 31. Further, the support member 31f is not limited to a cylindrical member, and may have any shape as long as the support member 31f can support the intermediate porous plate 31e, such as fixed with several bolts.
[0043]
As shown in FIG. 2, it is best to fill the inside of the emulsion breaking oil adsorption tank main body 31 with the activated carbon 34 immediately downstream of the intermediate porous plate 31e, but fill the activated carbon 34 immediately upstream of the intermediate porous plate 31e. The effect is almost the best. On the other hand, a considerable effect can be obtained by filling the intermediate perforated plate 31e slightly before and after, and a certain effect can be obtained by filling any one of the two ends of the emulsion breaking oil adsorption tank main body 31.
[0044]
Here, as a method of making the adsorbent 32 with the emulsion breaking particles in which the emulsion breaking particles are attached to the adsorbent, a solution in which the emulsion breaking particles such as amine and barium sulfate are dissolved in a solvent is attached to the adsorbent. A method of evaporating and drying the solvent later is common, but a method of spraying the solution onto the oil adsorbent 33 in a mist state is also available. A method is also conceivable in which the emulsion-breaking particles such as amine and barium sulfate are not dissolved but adhered to the adsorbent in a state of being uniformly mixed in a liquid.
[0045]
In this case, the emulsion breaking particles and the adsorbent may be filled so as to be dispersed among the adsorbents in the state of the particles without being in the state of the adsorbent 32 with emulsion breaking particles. In this case as well, the activated carbon 34 may be disposed immediately before or immediately before or upstream of the intermediate porous plate 31e, or may be disposed immediately after or immediately before the porous plate 31c at the inlet or outlet.
[0046]
However, in any of the above cases, a configuration in which the activated carbon 34 is not provided is also conceivable.
[0047]
On the other hand, the amine used in the present invention may be an amine compound or a derivative thereof. When the amine compound or its derivative is at 25 ° C., it is preferable that the amine is in a solid state. Or a compound which becomes solid in a mixture with another compound. That is, the compounds may be used alone or in combination of two or more.
[0048]
These amine compounds and derivatives thereof are preferably primary amines, secondary amines, tertiary amines and derivatives thereof, more preferably primary amines, secondary amines and derivatives thereof, and particularly preferably. Is a primary amine (eg, stearylamine) and its derivatives.
[0049]
As these amine compounds, for example, primary amines such as hexylamine, hebutylamine, octylamine, nonylamine, decylamine, laurylamine, myristylamine, palmitylamine, oleylamine, stearylamine, or a hydrocarbon chain thereof. Secondary amines such as diamines and triamines, and tertiary amines, or picrads thereof, various salts (for example, salts of hydrochloric acid, sulfuric acid, phosphoric acid, carbonic acid, acetic acid, etc.), and further, these hydrocarbon chains are And primary amines, acid amides of secondary amines, amidines, ureas, thioureas and Schiff bases of primary amines.
[0050]
As the amide, sulfonamides such as p-toluenesulfonyl-N-stearylamide and N-stearylacetamide are preferable. In addition, quaternary ammonium salts having these hydrocarbon chains, betaine and the like can be mentioned. Furthermore, for example, polyvalent amines such as stearyl propylene diamine and semi-hardened tallow diamine can also be used. Further, it is also possible to use a mixture of amines having hydrocarbon chains having different carbon numbers, such as hardened tallow amine and coconut amine.
[0051]
As the adsorbent used for the oil adsorbent 33 and the adsorbent 32 with emulsion destruction particles, those made of fibers of polypropylene or polystyrene can be considered. However, the adsorbents used for the oil adsorbent 33 and the adsorbent 32 with emulsion-breaking particles are not limited to these. Any adsorbent having an oil adsorbing function and being water-insoluble can be used. Other things are also acceptable.
[0052]
Here, the size of the adsorbent used for the oil adsorbent 33 and the adsorbent 32 with emulsion-breaking particles is preferably (10 mm to 200 mm) × (2 mm to 50 mm), more preferably. Has a size of (30 mm to 80 mm) × (5 mm to 40 mm). In particular, it is most preferable to prepare two sizes of (35 mm to 55 mm) × (25 mm to 40 mm) and (40 mm to 60 mm) × (3 mm to 10 mm). From another point of view, it can be said that it is close to the idea of preparing two types of small pieces having a size of 100 mm x 50 mm or less and having a size different from 3 to 10 times in area. It can be said that it is ideal to prepare two types of small pieces having a size of 60 mm × 40 mm or less and having different sizes 4 to 8 times in area.
[0053]
In this case, the reason why such a size is preferable is that when the adsorbent used for the oil adsorbent 33 and the adsorbent 32 with the emulsion destruction particles is filled in the emulsion destruction oil adsorption tank main body 31 when it is too large. Because it is difficult to fill a large amount due to the large gap, it is difficult to obtain a large surface area, and there are many parts that are forcibly compressed. The function of adsorption deteriorates, and the performance cannot be ensured due to the small amount of filling.If it is too small, the gaps are basically small, so that the emulsified oil is destroyed and the function of adsorption is deteriorated. Is faster and it is troublesome to cut, and it is troublesome to perform various management.
[0054]
In addition, the use of two types of sizes means that two types of small pieces having different sizes are prepared, and a large gap or excessive compression, which is an issue of enlarging, is added to a small one. This makes it possible to make up for it, and at the same time, it has a significant meaning that the problem of early function degradation, which is a problem of reducing the size, can be made up by adding a large one.
[0055]
For the two types of small pieces, it is best to use two types of small pieces for both the oil adsorbent 33 and the adsorbent used for the emulsion breaking particle-attached adsorbent 32. A small piece and a large piece may be used as the adsorbent used for the adsorbent 32 with the emulsion breaking particles, or vice versa.
[0056]
Finally, the fresh water confirmation tank 40 is composed of a fresh water confirmation tank transparent main body 41 and an openable / closable fresh water discharge valve 42 connected to the bottom thereof. In this case, the clear water confirmation tank transparent body 41, which is also the transparency confirmation means 41, is made of plastic or glass, and the body part and the lid part which are transparent so that the liquid inside can be seen are sealed. The inflow passage 41a, the outflow passage 41b, and the outflow pipe 41c are formed in the lid portion of the transparent body 41 of the fresh water confirmation tank so as to be sealed by an O-ring or the like, although not specifically shown. The outflow pipe 41c is connected to the fresh water pipe 281 via the outflow path 41b.
[0057]
Therefore, as means for confirming the transparency, an optical method is also conceivable, such as a visual check or a method of irradiating light and making a judgment based on transmitted light or reflected light.
[0058]
The oil / water separation method and the oil / water separation device for drain water generated from compressed air according to the present invention are configured as described above, and the operation thereof will be described below.
[0059]
First, when the motor constituting the air compressor 110 is operated, the rotation of the motor is transmitted to the compressor to generate compressed air. Here, the generated compressed air passes through the compressed air pipe 201, the aftercooler 120, the compressed air pipe 202, the air tank 130, the compressed air pipe 203, the dryer 140, the compressed air pipe 204, the filter 150, and the compressed air pipe 205. As a result, it is possible to send dry and clean compressed air to the actuator at the tip as required.
[0060]
On the other hand, the drain water generated from the compressed air in the aftercooler 120, the air tank 130, the dryer 140, and the filter 150 is discharged together with the compressed air together with the drain discharge pipes 211a, 212a, 213a, 214a and the valves 221, 231, 241, 251 and the drain discharge. Pipes 211b, 212b, 213b, 214b, drain traps 222, 232, 242, 252, drain discharge pipes 211c, 212c, 213c, 214c, check valves 223, 233, 243, 253 and drain discharge pipes 211d, 212d, 213d, Through the 214d, they merge at the collecting pipe 261 and are further sent to the oil / water separator 1 via the check valve 265 and the collecting pipe 262. The oil / water separator 1 removes various foreign substances including oil, The water is discharged directly to the river via the fresh water pipe 281, the valve 285 and the fresh water pipe 282. So that the it can also be a beautiful Shimizu, such as problem-free.
[0061]
In this case, in the oil-water separator 1, first, oil lighter than water is floated on the water surface in the oil floatation separation chamber 11x of the oil separation tank 10, and various foreign substances heavier than water are settled to the bottom, and the oil floatation separation is performed. A relatively clean drain water from which oil and various foreign matters have been removed is passed into the water storage chamber 11y through the space between the tip of the partition 11d formed between the chamber 11x and the water storage chamber 11y and the bottom of the oil separation tank main body 11. It is supposed to be. However, the emulsified oil is mixed in the drain water.
[0062]
On the other hand, the compressed air sent into the oil separation tank 10 together with the drain water stays in the sealed portions of the upper part of the oil floating separation chamber 11x, which is the upper part of the oil separation tank main body 11, and the upper part of the water storage chamber 11y. I have. In addition, the dirty drain water immediately after being sent to the oil separation tank 10 by the transparent transparent pipe 11a located outside the oil separation tank main body 11 and communicating with the oil floating separation chamber 11x of the oil separation tank main body 11, It is possible to visually check the state of dirt.
[0063]
Here, if the drain water sent into the water storage chamber 11y accumulates above the pipe end which is one end of the discharge pipe 11c formed in the water storage chamber 11y, it will stay at the upper part of the oil separation tank main body 11. The compressed air is fed into the foreign matter capturing tank 20 via the discharge pipe 11c, the connecting pipe 271, the check valve 275, and the connecting pipe 272, and further the emulsion breaking oil absorbing tank 30 and the fresh water confirming tank 40. It is discharged as fresh water via.
[0064]
In this case, since the foreign matter trapping tank 20, the emulsion breaking oil adsorption tank 30, and the fresh water confirmation tank 40 are in a sealed state, the drainage water is discharged until the drain water is discharged from the fresh water pipe 282. Helping to move. Note that a pressure of 0.01 to 0.7 MPa is set as the compressed air.
[0065]
However, oil and various foreign substances are separated in the oil floating separation chamber 11x and the like of the oil separation tank 10, but the emulsified oil is sent to the foreign substance capturing tank 20 while being dissolved in the drain water.
[0066]
Therefore, in the foreign matter capturing tank 20, the emulsified oil passes through the filter element 22, thereby separating the foreign matter, and at the same time, breaking the emulsion by releasing the bond between the water and the oil of the emulsified oil. The separated oil is coarsened. Then, while a part of the separated oil is absorbed by the filter element 22, a part of the separated oil, a part of the remaining emulsified oil, and water are formed through the connection pipe 273 by the pressure of the compressed air. It is sent to the destruction oil absorption tank 30.
[0067]
On the other hand, in the emulsion-breaking oil adsorption tank 30, the drain water fed together with the compressed air has a substantially uniform mixture of the adsorbent 32 with the emulsion-breaking particles to which the emulsion-breaking particles adhere and the oil-adsorbing material 33 for adsorbing oil. By randomly passing through the adsorbent 32 with the emulsion-breaking particles and the oil adsorbent 33 in the container, the emulsion was broken down in the adsorbent 32 with the emulsion-breaking particles in addition to the emulsion breaking in the foreign matter capturing tank 20. Emulsion destruction is performed by releasing the bond between oil and water, and the separated oil is further adsorbed. The oil adsorbent 33 adsorbs the oil that could not be adsorbed by the adsorbent 32 with the emulsion destruction particles. By repeating the process randomly, the cleanliness of the drain water is improved. Further, when drain water passes through the activated carbon 34, odors and pigments are removed.
[0068]
In addition, the invention of the present application is to store the materials corresponding to the conventional adsorbents with emulsion-breaking particles 32 and oil adsorbents 33 in separate tanks, It does not mean that a plurality of the corresponding items are alternately stacked and stored. The present invention relates to an emulsion-breaking oil adsorption tank main body in which an adsorbent 32 with emulsion-breaking particles to which emulsion breaking particles for the purpose of emulsion breaking is attached and an oil adsorbent 33 for adsorbing oil are almost uniformly mixed. It has the feature that it is stored in 31.
[0069]
As a result, by uniformly mixing the adsorbent 32 with the emulsion breaking particles and the oil adsorbent 33, the resistance when the drain water flows is averaged, so that the adsorbent 32 with the emulsion breaking particles, which is conventionally seen, The unbalanced point that the resistance when the drain water flows was extremely high in the tank or layer of the corresponding portion was surely eliminated compared to the tank or layer of the portion corresponding to the oil adsorbent 33.
[0070]
Thus, depending on the amount of drain water and the degree of contamination, it is possible to cope with this by changing the mixing ratio of the adsorbent 32 with emulsion breaking particles and the oil adsorbent 33. In this case, the adsorbent 32 with emulsion-breaking particles and the oil adsorbent 33 are mixed, so that the emulsion-breaking oil adsorption tank 30 has a uniform resistance in all places. Can also be prevented from flowing.
[0071]
Further, it is possible to connect one, two, three or more foreign substance capturing tanks 20 and emulsion breaking oil adsorption tanks 30 to each other. In this case, when a plurality are connected, they are connected in parallel.
[0072]
In addition, as one example, specifically, it is shown how much thing is filled up. When the drain generated from the screw type air compressor of 55 Kw to 110 Kw, the foreign matter trapping tank 20 and the approximate inner diameter of 200 mm And a cylinder 950 mm in height filled with 2.5 kg of an adsorbent 32 of 45 mm × 25 mm amine-containing emulsion breaking particles, which is a nonwoven fabric made of polypropylene, and an oil adsorbent 33 of 45 mm × 5 mm, which is a nonwoven fabric made of polypropylene. An emulsion breaking oil adsorption tank 30 filled with 5 kg and activated carbon 34 filled with 1 kg is used in such a manner that two tanks are connected in series and arranged in parallel.
[0073]
Finally, the fresh water discharged from the emulsion breaking oil adsorption tank 30 is sent to the fresh water confirmation tank 40 together with the compressed air. Here, in the fresh water confirmation tank 40, the fresh water at the lower part of the main body of the fresh water confirmation tank transparent main body 41 accumulates to the height of the end of the outflow pipe 41c, and the end of the outflow pipe 41c is closed by the pressure of the compressed air sealed at the upper part. The fresh water staying above the section is pumped out together with the compressed air and discharged. At the same time, since the fresh water confirmation tank transparent main body 41 is transparent, it becomes a transparency confirmation means 41 for confirming the dirt of the fresh water flowing inside, and the transparency of the fresh water passing through the inside can be visually or optically confirmed. ing.
[0074]
In this case, the deterioration of the performance of the oil-water separator 1 is determined by comparing the transparent pipe 11a, which is the pollution degree checking means 11a of the oil separation tank 10, with various methods such as visual observation, light transmission, and light reflection. It is possible to appropriately judge the replacement time of the filter element 22 constituting the foreign matter trapping tank 20 and the adsorbent 32 and the oil adsorbent 33 with the emulsion breaking particles constituting the emulsion breaking oil adsorption tank 30. Became possible.
[0075]
When the emulsion-breaking oil adsorption tank main body 31 constituting the emulsion-breaking oil adsorption tank 30 is made transparent by plastic or glass, the fresh water confirmation tank 40 may not be provided.
[0076]
【The invention's effect】
As is apparent from the above description, the following effects can be obtained by the present invention.
[0077]
First, the emulsion-breaking oil adsorbent to which the emulsion-breaking particles are attached and the oil-adsorbing material that adsorbs the oil are stored in the emulsion-breaking oil-adsorbing tank main body in a substantially uniform state. The resistance to drain water flow was the same in all locations of the oil adsorption tank, and the unbalanced point of high drain water flow through the adsorbent with emulsion-breaking particles was certainly eliminated.
[0078]
Secondly, it is therefore possible to select an intermediate compressed air pressure for the high resistance of the conventional adsorbent with emulsion-breaking particles and the low resistance of the oil adsorbent, setting at a relatively low pressure is possible. It has become possible.
[0079]
Third, drain water flowing only through a specific flow path has been reduced.
[0080]
Fourth, the breaking of emulsion, in which minute oil is combined with water to release the bond between water and oil that has been emulsified into drain water, can be performed more efficiently by passing through a filter element. .
[0081]
Fifth, by arranging the adsorbent with the emulsion breaking particles and the oil adsorbent in combination, an oil-water separator with higher capacity has become possible.
[0082]
Sixth, emulsion breaking, in which minute oil is combined with water to release the water-oil bond of the emulsified drain water, is applied to the filter element, and the adsorbent 32 with the emulsion-breaking particles and the oil adsorbent 33 are applied several times. By going through, you can do more powerfully.
[0083]
Seventh, the use of amines and barium sulfate as emulsion breaking particles has made it possible to break down emulsions dramatically.
[Brief description of the drawings]
FIG. 1 is an overall view of an embodiment showing the present invention. FIG. 2 is a detailed view of an emulsion breaking oil adsorption tank constituting an oil-water separation device of the present invention.
1 oil-water separation device 10 oil separation tank 11 oil separation tank main body 11a transparent tube (contamination degree confirmation means)
11b... Suction pipe 11c... Discharge pipe 11d... Partition wall 11x... Oil floating separation chamber 11y. 13 floating oil take-off valve 20 foreign matter capturing tank 21 foreign matter capturing tank body 21a inflow path 21b outflow path 22 ... Filter element 23 ... Pressure gauge 24 ... Pressure gauge 30 ... Emulsion breaking oil adsorption tank 31 ... Emulsion breaking oil adsorption tank Main body 31a Inlet 31b Outlet 31c Perforated plate 31d Support 31e Intermediate perforated plate 31f Support member 31z ······ Space 32 ··· Adsorbent 33 with emulsion breaking particles ····· Oil adsorbent 34 ··· - activated carbon 40 ...... Shimizu confirmation tank 41 ...... Shimizu confirmation tank transparent body (transparency confirmation means)
41a... Inflow path 41b... Outflow path 41c... Outflow pipe 42... Fresh water discharge valve 110... Air compressor 120. 130, an air tank 140, a dryer 150, a filter 201, a compressed air pipe 202, a compressed air pipe 203, a compressed air pipe 204 ······ Compressed air pipe 205 ····· Compressed air pipe 211a ··· Drain discharge pipe 211b ··· Drain discharge pipe 211c ··· Drain discharge pipe 211d ··· Drain discharge pipe 212a Drain discharge pipe 212bDrain discharge pipe 212cDrain discharge pipe 212dDrain discharge pipe 213aDrain discharge pipe 213bDrain discharge pipe 213c Drain discharge pipe 213d Drain discharge pipe 214a Drain discharge pipe 214b Drain discharge pipe 214c Drain discharge pipe 214d Drain discharge pipe 221 ··· Valve 222 ····· Drain trap 223 ··············· Valve 232 ········· Drain trap 233 ·················· Valve 242 drain trap 243 check valve 251 valve 252 drain trap 253 check valve 261 collecting pipe 262 ... Collecting pipe 265... Check valve 271. ····· Check valve 281 ······································ ... valve

Claims (7)

In the oil-water separation method in which the micro oil and water are combined to form an emulsified drain water, in order to remove the oil by breaking the emulsion that releases the bond between the water and the oil, the drain water generated from the compressed air is First, after passing through a filter element (22) that causes emulsion breaking, an adsorbent (32) with emulsion breaking particles to which emulsion breaking particles that cause emulsion breaking and oil adsorption are attached, and an oil adsorbent ( 33) The method of separating drain water generated from compressed air, characterized in that foreign substances centered on oil contained in the drain water are separated by passing the mixture in a substantially uniform manner. In the oil-water separation method in which the micro oil and water are combined to form an emulsified drain water, in order to remove the oil by breaking the emulsion that releases the bond between the water and the oil, the drain water generated from the compressed air is First, after passing through the filter element (22) that causes emulsion destruction , further pass through a substantially uniform mixture of emulsion-disrupted particles that cause emulsion destruction and an oil adsorbent (33) that adsorbs oil. A method for separating foreign matter, mainly oil contained in the drain water, from drain water generated from compressed air. In oil-water separator of the drain water oil and water are emulsified bonded to the minute, to remove the oil to cause emulsion breaking unleashing the binding of water and oil, to put the emulsion destroy foreign substances separated A foreign matter trapping tank (20) comprising a filter element (22) for causing the emulsion to break, and an adsorbent (32) with emulsion breaking particles to which emulsion breaking particles for causing emulsion breaking and oil adsorption are attached; and an oil absorbing material (33) for absorbing oil. ) and a generally uniform emulsion breaking oil adsorption vessel which houses in a state of being mixed (30) oil-water separator of the drain water generated from the compressed air, characterized in that it has disposed. In an oil-water separator that combines fine oil and water to form an emulsified drain water, the emulsion is broken by releasing the bond between water and oil to remove the oil. Emulsion destruction in which a foreign matter trapping tank (20) constituting a filter element (22) for causing an emulsion and an oil adsorbent (33) for adsorbing oil and an emulsion destruction particle for causing an emulsion destruction are stored substantially uniformly mixed. An oil-water separator for drain water generated from compressed air, comprising an oil adsorption tank (30) . The compressed air according to claim 3 or 4 , wherein an oil separation tank (10) for separating oil lighter than water or foreign matter heavier than water is arranged upstream of the foreign matter capturing tank (20). Oil-water separation device for drain water generated from. The emulsion breaking oil absorption tank main body (31) constituting the emulsion breaking oil absorption tank (30) is made of a transparent material whose internal state can be visually observed from the outside. 6. The apparatus for separating oil and water of drain water generated from compressed air according to claim 5 , wherein a pollution degree checking means (11a) is provided in () for enabling visual observation of an internal situation from outside. Generally so as to block the flow of the drain water in the entire cross section of the central portion, according to claim 3 or claims, characterized in that housing the activated carbon (34) to remove the dye and odor of the emulsion breaking oil adsorption tank (30) Item 7. An oil / water separator for drain water generated from compressed air according to any one of Items 6 .

Images