JP2003001245A - Oil water separating method of drain water generated from compressed air and oil water separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique which causes emulsion breaking which releases the connection between water and oil of drain water emulsified by connecting fine droplets of oil with water. SOLUTION: In order to separate foreign matters which consists essentially of oil from the drain water which is generated from the compressed air and is pressurized to 0.01-0.7 MPa, an emulsion breaking oil adsorbing tank 30 which houses an emulsion breaking particle attaching adsorbent 32 which attaches emulsion breaking particles thereto and an oil adsorbing material 33 which adsorbs the oil in the state of allowing the same to coexist almost uniformly is disposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-water separation method and an oil-water separation apparatus for drain water generated from compressed air. More specifically, minute oil is combined with water to form an emulsion. The present invention relates to a technique for causing emulsion breakage by releasing the bond between water and oil in drain water.

[0002]

2. Description of the Related Art Conventionally, there have been many techniques for separating oil / water of drain water generated from compressed air and an oil / water separation device for separating oil and lighter foreign matter than water from dirty drain water. It was

In addition, there are filters, oil adsorbents, electrolysis, and chemicals.

Further, as a technique using an adsorbent with emulsion breaking particles, as shown in Japanese Unexamined Patent Publication (Kokai) No. 54-6352, wastewater is treated with a treatment material in which amine or the like is attached to a support. A method for separating oil / water by performing a two-step treatment such as treatment with an oil adsorbent such as polypropylene after roughening or breaking the emulsion particles therein has been disclosed.

Further, as another technique using the adsorbent with emulsion breaking particles, Japanese Patent Laid-Open No. 2001-113269 is available.
As disclosed in Japanese Unexamined Patent Application Publication No. 2000-187, a plurality of pairs of an oil adsorption layer made of an oil adsorbent having a relatively low hydrophilicity and an emulsion decomposition layer made of an emulsion treated material or an oil adsorbent having a relatively high hydrophilicity are alternately laminated. An oil / water separator was shown.

[0006]

However, the conventional oil-water separation method and apparatus for separating drain water generated from compressed air as described above have the following problems.

[0007] First, the separation of oil from drain water in which minute oil is combined with water to form an emulsion is performed by utilizing the density difference between water and oil or foreign matter, by a filter, or by oil adsorption. It was almost impossible to do with a simple device such as a material. Further, clogging by foreign matter is quick, and maintenance at that time is complicated.

Secondly, the electrolysis method and the chemical method require a large size and a high cost as the degree of perfection is pursued.

Thirdly, if an oil-water separator is constructed by combining these methods, the processing capacity including the emulsion destruction is improved, but the apparatus tends to be large and the cost tends to be high, and the efficiency is high. I had a hard time making a device.

Fourth, in the two-step treatment of emulsion breakage and oil adsorption, which is disclosed in Japanese Patent Laid-Open Publication No. 54-6352, it is necessary to select a flow path through which drain water easily flows during the oil adsorption treatment. Therefore, it was often the case that only a specific part of the adsorbent was passed through, and as a result, the adsorbent replacement was necessary at an early stage. In addition, since the emulsion destruction treatment material has a higher resistance than the oil adsorbent material, the capacity of the emulsion destruction treatment material was reduced in order to balance the two, but on the other hand, for contaminated drain water, However, it is necessary to increase the capacity of the emulsion breaking treatment material, and when it is attempted to make the capacity extremely large, there is a problem that the drain water is not balanced in terms of resistance.

Fifth, in the oil-water separator in which a plurality of sets of oil adsorption layers and emulsion decomposition layers are alternately laminated, which is disclosed in Japanese Patent Laid-Open No. 2001-113269, the treatment material for emulsion destruction is the oil adsorption material. Because there is more resistance than
The thickness of the emulsion decomposing layer was thin in order to balance the two in accordance with the resistance when flowing, but on the other hand, it is necessary to increase the thickness of the emulsion decomposing layer for heavily contaminated drain water. However, in the case of trying to make it extremely thick, there was a problem that the drain water was not balanced in terms of resistance when flowing. The present invention aims to solve such problems.

[0012]

According to the present invention, the drain water generated from compressed air is substantially uniformly dispersed in the adsorbent 32 with emulsion breaking particles to which emulsion breaking particles are attached and the oil adsorbent 33 for adsorbing oil. It is characterized by separating foreign matter centered on oil contained in the drain water by passing through mixed water, and further adsorbing drain water generated from compressed air to emulsion breaking particles and oil. The oil adsorbent 33 is mixed with the oil adsorbent 33 so that the foreign matter centered on the oil contained in the drain water is separated, and further, the drain water is the emulsion. The emulsion adsorbent 32 with destructive particles, the oil adsorbent 33, and the oil adsorbent 3 so that the adsorbent 32 with destructive particles, the oil adsorbent 33, and the oil adsorbent 33 evenly pass through. A space 31z having the same cross section as the adsorbent 32 with emulsion breaking particles, the oil adsorbent 33, and the portion in which the oil adsorbent 33 is present, before and after passing through Solves the above-mentioned problem by being characterized in that the drain water is pressurized to 0.01 to 0.7 MPa.

Further, according to the present invention, it is possible to obtain the pressure of 0.
In order to separate foreign matters centering on oil from the drain water pressurized to 01 to 0.7 MPa, the adsorbent 32 with emulsion breaking particles to which emulsion breaking particles are attached and the oil adsorbent 33 for adsorbing oil are generally used. The emulsion-breaking oil adsorption tank 30 accommodated in a state of being uniformly mixed is arranged, and further oil upstream of the emulsion-breaking oil adsorption tank 30 and foreign matter heavier than water are separated. It is characterized in that the oil separation tank 10 is provided, and further, the emulsion breaking oil adsorption tank body 31 constituting the emulsion breaking oil adsorption tank 30 is made of a transparent material from which the inside condition can be visually observed from the outside. The oil separation tank 10
Is provided with a pollution degree confirming means 11a capable of visually observing the inside condition from the outside, and further, the flow of the drain water is distributed over the entire cross section of the emulsion destructive oil adsorption tank 30 at a substantially central portion thereof. It is characterized in that activated carbon 34 for removing pigments and offensive odors is arranged so as to block the adsorbent 32 with emulsion breaking particles attached to the adsorbent. Further, the above-mentioned problems are solved by the fact that the emulsion breaking particles are amine or barium sulfate.

[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 invention of the present application, and FIG. 2 is a detailed view of an emulsion-breaking oil adsorption tank constituting the oil-water separator of the present invention.

As shown in FIG. 1, an air compressor 110 is composed of a motor and a compressor (not specifically shown). The rotation of the motor is transmitted to the compressor, and the compressed air is taken in while taking in the atmosphere. Is producing.

Here, the compressed air produced by the air compressor 110 is compressed air pipe 201, aftercooler 120, compressed air pipe 202, air tank 130, compressed air pipe 203, and dryer 1.
40, compressed air piping 204, filter 150,
Compressed air can be supplied to various pneumatic devices such as an air motor and an air cylinder via the compressed air pipe 205.

In this case, the compressed air is dried by the aftercooler 120 and the dryer 140, and various foreign matters such as oil and solids are removed by the filter 150, so that the dried clean compressed air is compressed by various pneumatic pressures. The equipment can be supplied.

On the other hand, from the aftercooler 120, a drain discharge pipe 211a, a valve 221, which can be opened and closed, a drain discharge pipe 211b, and an electric drain trap 222 which discharges drain water together with compressed air by some signal. ,
The drain discharge pipe 211c, the check valve 223 for preventing backflow from the downstream side to the upstream side, and the drain discharge pipe 211d are connected to the collecting pipe 261 so that drain water can be discharged.

Also, from the lower part of the air tank 130 which stores compressed air, a drain discharge pipe 212a, a valve 231 that can be opened and closed, a drain discharge pipe 212b, drain water together with compressed air by some signal. An electric drain trap 232 for discharging, a drain distribution discharge 212c,
A check valve 233 for preventing reverse flow from downstream to upstream;
Collecting pipe 26 at the uppermost stream via drain discharge pipe 212d
It is connected to 1 and drain water can be discharged.

Further, from the dryer 140, a drain discharge pipe 213a, an openable / closable valve 241, a drain discharge pipe 213b, and an electric drain trap 242 for discharging drain water together with compressed air by some signal, The drain discharge pipe 213c, the check valve 243 for preventing reverse flow from the downstream side to the upstream side, and the drain discharge pipe 213d are connected to the collecting pipe 261 so that drain water can be discharged.

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, and an electric drain trap 252 that discharges drain water together with compressed air according to some signal.
The drain discharge pipe 214c, the check valve 253 for preventing reverse flow from the downstream side to the upstream side, and the drain discharge pipe 214d are connected to the collecting pipe 261 to discharge drain water.

From the collecting pipe 261, the check valve 26 is
5, a collecting pipe 262, and a valve 28 which can be opened and closed with a fresh water pipe 281 via an oil / water separation device 1 for separating oil and various foreign substances.
5 and the fresh water pipe 282 to discharge the fresh water. In this case, the check valve 265 allows drain water to pass from the collecting pipe 261 to the collecting pipe 262, but does not reversely flow drain water to the collecting pipe 262 to the collecting pipe 261.
However, the check valve 265 may not be provided. The fresh water discharged from the fresh water pipe 173 is
It is so clean that it can be discharged to rivers as it is.

In this case, the oil / water separation device 1 includes the oil separation tank 1
0, a foreign substance capturing tank 20, an emulsion breaking oil adsorbing tank 30, and a fresh water confirming tank 40. The oil separating tank 10 and the foreign material capturing tank 20 are connected by a connecting pipe 271, a check valve 275, and a connecting pipe 272. Then, the foreign matter capturing tank 20 and the emulsion breaking oil adsorption tank 30 are connected by a connecting pipe 273, and the emulsion breaking oil adsorption tank 30 and the fresh water confirmation tank 40 are connected by a connecting pipe 27.
Connected with 4.

However, the foreign matter trap tank 20 and the emulsion breaking oil adsorption tank 30 do not have to be limited to one each, and may be two, three, or more.
In that case, the foreign substance capturing tanks 20 and the emulsion breaking oil adsorbing tanks 30 may be arranged in parallel one by one, or the foreign substance capturing tanks 20 may be arranged in parallel and the emulsion breaking oil adsorbing tanks. It is also conceivable that a plurality of 30 are configured in parallel and configured in series.

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 tank chamber 11y, and the oil separation tank main body 11 is sealed.
In the upper part, above the liquid level in the upper part, only the compressed air, which is a gas, can enter and leave between the oil flotation separation chamber 11x and the water storage chamber 11y, and in the lower part, the drain water which is a liquid. Between the oil flotation / separation chamber 11x and the water storage tank chamber 11y between the tip of the partition wall 11d and the bottom of the oil separation tank main body 11 is freely accessible.

Then, in the upper part of the oil floating separation chamber 11x,
The other pipe end of the suction pipe 11b, which protrudes from the liquid surface and has one pipe end connected to the collecting pipe 262, is located so that drain water flows in. Therefore, the oil floating separation chamber 11
At x, oil lighter than water floats on the liquid surface, and foreign matter heavier than water precipitates on the bottom. In this case, the oil floating on the liquid surface can be discharged by opening the floating oil extraction valve 13.

On the other hand, in the water storage chamber 11y, one pipe end of the discharge pipe 11c is located on the liquid surface, and the tip of the partition wall 11d at the lower part between the oil levitation separation chamber 11x and the water storage chamber 11y and the oil separation tank main body. Oil that is lighter than water and a drain water that is heavier than water is removed from the portion communicating with the bottom of the nozzle 11. However, the emulsified oil dissolved in the drain water, and could not be separated by such a method and flowed as it was.

Here, the other pipe end of the discharge pipe 11c is connected to the connection pipe 271. Therefore, the water storage chamber 11y
The oil-removed and relatively clean drain water located above one of the ends of the discharge pipe 11c gathered on the liquid surface is communicated with the upper part of the oil levitation separation chamber 11x and the upper part of the water storage chamber 11y to be sealed. Due to the pressure of the compressed air, it enters from one pipe end of the discharge pipe 11c and is sent into the connecting pipe 271 together with the compressed air from the other pipe end. In order to control the pressure of the compressed air in the upper part of the oil flotation separation chamber 11x and the upper part of the water storage tank chamber 11y, a pressure gauge 1 is installed above the oil separation tank main body 11.
2 are arranged.

The outer periphery of the oil separation tank body 11 is shown in FIG.
As shown in Fig. 1, the oil separation tank body 1 is located in the vertical direction.
1, a transparent transparent tube 11a is formed which communicates with four points including the upper end and the lower end. In this case, the purpose of the transparent tube 11a is to confirm the condition of the contaminated drain water in the oil levitation separation chamber 11x immediately after flowing into the oil levitation separation chamber 11x by visual inspection or optical means, and to prevent contamination. Degree checking means 1
It plays the role of 1a. Therefore, the transparent tube 11a may be made of a transparent material such as glass or plastic.

It should be noted that the number of communication points between the transparent pipe 11a and the oil separation tank main body 11 is not limited to four, and it may be two, three, five or more. Further, as a means for confirming the degree of contamination, an optical method such as irradiating light and making a judgment by transmitted light or reflected light can be considered.

Next, the foreign substance capturing tank 20 is composed of a foreign substance capturing tank main body 21, a filter element 22, and pressure gauges 23 and 24. In this case, the foreign matter capturing tank body 21
Is configured to be hermetically sealed by a main body portion and a lid portion, an inflow passage 21a and an outflow passage 21b are formed in the lid portion of the foreign matter trap tank main body 21, and pressure gauges are provided in the flow passages 21a and 21b. 23 and 24 are connected.

In this case, the pressure of the pressure gauges 23 and 24 together with the pressure of the pressure gauge 12 of the oil separation tank 10 is 0.01 to 0.7.
It is set to any value of MPa. However, some consideration needs to be given to the pressure loss due to the connecting pipes 271, 272, etc. between the pressure gauges 12, 23, 24. Here, if the set pressure is too low, 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. As will be described later, when passing through the emulsion-breaking oil adsorption tank 30, a problem of forming a specific flow path occurs.

The filter element 22 is housed inside the main body of the foreign substance trap tank body 21 and is fixed by the lid portion of the foreign substance trap tank body 21. Therefore,
The drain water from the oil separation tank 10 that has flowed into the foreign matter trap tank 20 is always discharged from the foreign matter trap tank 20 via the filter element 22 from the outside to the inside. When drain water passes through the filter element 22, a part of the emulsified oil breaks the emulsion by releasing the bond between water and oil. Here, the two pressure gauges 23 and 24 determine the replacement timing of the filter element 22 based on the pressure difference. However, the foreign matter capturing tank 20 may not be installed.

Further, in the emulsion breaking oil adsorbing tank 30, the activated charcoal 34 for removing pigments and offensive odors is disposed in the emulsion breaking oil adsorbing tank main body 31 so as to block the flow of drain water over the entire cross section of the central portion. Then, a mixture of the adsorbent 32 with emulsion breaking particles to which emulsion breaking particles for the purpose of breaking the emulsion and the oil adsorbent 33 for adsorbing oil are mixed almost uniformly is housed before and after the activated carbon 34. It is a thing.

Here, the emulsion breaking oil adsorption tank body 3
1. Use a transparent material such as glass or plastic that allows you to visually check the inside from the outside, or insert a transparent material such as glass or plastic that allows you to see the inside from the outside. Etc. are also possible.

In this case, the adsorbent 32 with emulsion breaking particles releases the bond between oil and water by destroying the emulsion water by the action of the emulsion breaking particles to bind the minute oil with water to emulsify the drain water. ,
The separated oil is adsorbed by the adsorbent or the oil adsorbent 33 that constitutes the adsorbent 32 with emulsion breaking particles. Therefore, the adsorbent 32 with emulsion breaking particles and the oil adsorbent 33
It was possible to remove the oil by completely separating it from the emulsified oil and adsorbing it.

On the other hand, the granular activated carbon 34 has the purpose of adsorbing or removing pigments and offensive odors. In addition, as the position where the activated carbon 34 is filled in the oil separation / adsorption tank 30, it seems that the activated carbon 34 is soiled earlier in the uppermost stream, and the soiled water flows by the activated carbon 34 itself flowing out in the lowermost stream. In addition, it is desirable to locate it in the central part.

Here, the emulsion breaking oil adsorption tank body 3
As the structure of 1, the drain water which is a liquid is
The inlets at both ends of the emulsion-breaking oil adsorption tank body 31 so that the emulsion-breaking oil adsorption tank body 31 flows uniformly through the emulsion-breaking oil adsorption tank body 31 while flowing from the outlet 31b. A space 31z is secured on the side and the exit side.

Therefore, in order to secure the spaces 31z at both ends, two perforated plates 31c having many small holes are prepared, and the end of both ends of the perforated plate 31c and the emulsion breaking oil adsorption tank main body 31 are prepared. A cylindrical column 31d having a diameter smaller than that of the emulsion-breaking oil adsorbing tank main body 31 is provided between them to support the perforated plate 31c, and the adsorbent 32 with emulsion breaking particles, the oil adsorbent 33, and the activated carbon 34 are It is arranged to be housed between two perforated plates 31c. However, the column 31d need not be limited to a cylindrical column,
Any shape may be used as long as the space 31z can be secured. As the perforated plate 31c, a punching plate having many small holes, a ceramic resin, or the like can be considered.

Also, the adsorbent 32 with emulsion breaking particles
The resistance of the oil adsorbent 33 increases as it absorbs foreign matter such as oil, and is further pressed by being pressed toward the downstream side while being compressed. Is reduced.

Therefore, in order to prevent this even a little, the intermediate perforated plate 31e in which a large number of small holes are formed in the substantially central portion of the oil separation / adsorption tank main body 31 so that the liquid flow can be vertically blocked. To support the intermediate perforated plate 31e, a cylindrical support material 31f having a diameter smaller than that of the oil separation adsorption tank body 31 is disposed between the intermediate perforated plate 31e and the perforated plate 31c. Material 32
The oil adsorbent 33 is prevented from being compressed.

However, the position of the intermediate perforated plate 31e may be slightly forward or backward about the center of the oil separation / adsorption tank main body 31. Further, the support material 31f is not limited to the cylindrical shape, and may be fixed with a few bolts.
Any shape may be used as long as it can support 1e.

As shown in FIG. 2, activated carbon 34 is placed inside the emulsion-breaking oil adsorption tank body 31 as the intermediate porous plate 3.
It is best to fill immediately after the downstream of 1e, but filling near the upstream of the intermediate perforated plate 31e also has an effect close to the best. On the other hand, a considerable effect can be seen by filling the intermediate porous plate 31e slightly before and after, and a proper effect can be seen by filling either part of both ends of the emulsion breaking oil adsorption tank body 31.

Here, as a method for producing the adsorbent 32 with emulsion breaking particles by adhering the emulsion breaking particles to the adsorbent, a solution in which the emulsion breaking particles such as amine and barium sulfate are dissolved in a solvent is used as the adsorbent. A method of evaporating and drying the solvent after the attachment is generally used, but there is also a method of spraying the solution in a mist state on the oil adsorbent 33. Further, a method of adhering the emulsion-breaking particles of amine, barium sulfate, or the like to the adsorbent in a state of being uniformly mixed in the liquid instead of being dissolved is also considered.

In this case, the emulsion-breaking particles and the adsorbent may not be in the state of the adsorbent 32 with emulsion-breaking particles, but may be filled so as to be dispersed among the adsorbents in the state of particles. In this case also, activated carbon 34
May be arranged immediately before and immediately upstream of the intermediate perforated plate 31e or in the periphery thereof, or may be arranged immediately after and immediately before the perforated plate 31c at the inlet and the outlet.

However, in any of the above cases, it is possible to consider a structure in which the activated carbon 34 is not arranged.

On the other hand, as the amine used in the present invention, an amine compound or its derivative is considered, and it is preferable that the amine compound or its derivative is in a solid state at 25 ° C. It may be a non-solid state compound or a compound that becomes a solid state in a mixture with another compound. That is, the compounds may be used alone or in combination of two or more.

These amine compounds and their derivatives are preferably primary amines, secondary amines, tertiary amines and their derivatives, more preferably primary amines.
Secondary amines and their derivatives, particularly preferably 1
And secondary amines (eg, stearylamine) and their derivatives.

Examples of these amine compounds include, for example:
Primary amines such as hexylamine, hebutylamine, octylamine, nonylamine, decylamine, laurylamine, myristylamine, palmitylamine, oleylamine and stearylamine, or secondary amines such as diamines and triamines having hydrocarbon chains. , And tertiary amines, or picrads thereof, various salts (for example, salts of hydrochloric acid, sulfuric acid, phosphoric acid, carbonic acid, acetic acid, etc.),
Further, there are primary amines having these hydrocarbon chains, acid amides of secondary amines, amidines, ureas, thioureas and Schiff bases of primary amines.

Preferred amides are sulfonamides such as p-toluenesulfonyl-N-stearylamide and N-stearylacetamide. Further, quaternary ammonium salts having these hydrocarbon chains, betaine and the like can be mentioned. Further, for example, polyvalent amines such as stearyl propylene diamine and semi-cured beef tallow diamine can be used. Further, it is also possible to use a mixture of amines having hydrocarbon chains with different carbon numbers such as hardened tallow amine and coconut amine.

The adsorbent used in the oil adsorbent 33 and the adsorbent 32 with emulsion breaking particles may be made of polypropylene or polystyrene fiber. However, the adsorbents used for the oil adsorbent 33 and the adsorbent 32 with emulsion breaking particles are not limited to these, and any adsorbent that has an oil adsorbing function and is water-insoluble Others may be used.

Here, the size of the adsorbent used in the oil adsorbent 33 and the adsorbent 32 with emulsion breaking particles is preferably (10 mm to 200 mm) × (2
mm to 50 mm), but more preferably,
The size is (30 mm to 80 mm) × (5 mm to 40 mm). In particular, (35 mm to 55 mm) x
(25 mm to 40 mm) and (40 mm to 60 mm) ×
It is most preferable to prepare two sizes (3 mm to 10 mm). In other words, this is
It can be said that it is close to the idea of preparing two kinds of small pieces of 100 mm × 50 mm or less, which are 3 to 10 times different in area, and the best one is 60 mm × 40 m
It can be said that it is ideal to prepare two kinds of small pieces of m or less and different sizes of 4 to 8 times in area.

In this case, the reason why such a size is preferable is that when the adsorbent used in the oil adsorbent 33 and the adsorbent 32 with emulsion breaking particles is filled in the emulsion breaking oil adsorbing tank body 31, If it is too large, it will be difficult to fill a large amount due to the large gap, and it will be difficult to obtain a large surface area. The function of breaking and adsorbing the oil decreases and the performance cannot be secured because the filling amount decreases, and if it is too small, the gap is basically small and the emulsified oil will not be broken or absorbed. The function deteriorates quickly, and it is troublesome to cut, and it is also troublesome to manage various things.

Also, the use of two kinds of sizes means that by preparing two kinds of small pieces having different sizes, a large gap or an unreasonable compression, which is a problem in increasing the size, can be reduced. It is possible to make up for it by adding things, and at the same time, it has a great meaning that it is possible to make up for the functional deterioration at an early stage, which is a problem of making it smaller, by adding big things.

The oil adsorbent 3 is used for the two types of small pieces.
3 and the adsorbent used in the adsorbent 32 with emulsion-breaking particles, it is best to use two kinds of small pieces, but the oil adsorbent 33 is used as a small piece and the adsorbent 32 with emulsion-breaking particles is used Large pieces can be used for the adsorbent used, or vice versa.

Finally, the clear water confirmation tank 40 is composed of a clear water confirmation tank transparent main body 41 and an openable / closable fresh water extraction valve 42 connected to the bottom thereof. In this case, the clear water confirmation tank transparent main body 41, which is also the transparency confirmation means 41, is made of plastic or glass, and is transparent and allows the liquid inside to be visually observed. Although not specifically shown, an inflow passage 41a, an outflow passage 41b, and an outflow pipe 41c are formed in a lid portion of the clear water confirmation tank transparent main body 41 so as to be sealed by an O-ring or the like. The outflow pipe 41c is connected to the fresh water pipe 281 via the outflow passage 41b.

Therefore, as a means for confirming the transparency, it is possible to use an optical method which can be visually observed, and which is judged by transmitting light or reflected light by irradiating light.

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.

First, when the motor constituting the air compressor 110 is operated, the rotation of the motor is transmitted to the compressor to produce compressed air. The compressed air produced here is the compressed air pipe 201 and the aftercooler 1.
20, compressed air piping 202, air tank 130, compressed air piping 203, dryer 140, and compressed air piping 20
4, clean and compressed air can be sent out to the actuator at the tip of the compressed air via the filter 4, the filter 150 and the compressed air pipe 205.

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 together with the compressed air, the drain discharge pipes 211a, 212a, 213a, 214a and the valve 22.
1, 231, 241, 251 and the drain discharge pipe 211b,
212b, 213b, 214b and drain trap 22
2, 232, 242, 252 and the drain discharge pipe 211c,
212c, 213c, 214c and check valves 223, 23
3, 243, 253 and drain discharge pipes 211d, 212
d), 213d, 214d, merges in the collecting pipe 261, and is further sent to the oil / water separation device 1 via the check valve 265 and the collecting pipe 262. In the oil / water separation device 1, various foreign substances including oil , The fresh water pipe 281, the valve 285, and the fresh water pipe 2
It becomes possible to make clean fresh water that will not cause any problems if it is directly discharged into the river via 82.

In this case, in the oil / water separation device 1, first, in the oil levitation separation chamber 11x of the oil separation tank 10, oil lighter than water is floated on the water surface, and various foreign substances heavier than water are precipitated on the bottom. A relatively clean drain water, from which oil and various foreign substances have been removed, passes between the tip of the partition wall 11d formed between the oil floating separation chamber 11x and the water storage tank chamber 11y and the bottom of the oil separation tank main body 11, and is a water storage tank chamber. It will be sent to 11y.
However, the emulsified oil is mixed by being dissolved in this drain water.

On the other hand, the compressed air sent into the oil separation tank 10 together with the drain water is transferred to the sealed portions of the oil levitation separation chamber 11x and the water storage tank chamber 11y which are the upper portions of the oil separation tank main body 11. Has stayed. The oil separation tank body 11
The oil levitation separation chamber 11x of the oil separation tank body 11 located outside
With the transparent transparent pipe 11a communicating with, it is possible to visually confirm the dirty state of the dirty drain water immediately after being fed into the oil separation tank 10.

Here, when the drain water sent into the water storage tank chamber 11y collects above the pipe end which is one end of the discharge pipe 11c formed in the water storage tank chamber 11y, the drain water of the oil separation tank main body 11 is discharged. By the force of the compressed air staying in the upper part, the discharge pipe 11c, the connection pipe 271, the check valve 275, and the connection pipe 27.
It is sent to the foreign matter capturing tank 20 via 2 and is further discharged as fresh water via the emulsion breaking oil adsorption tank 30 and the fresh water confirming tank 40.

In this case, the force of the compressed air is
0, the emulsion destruction oil adsorption tank 30 and the fresh water confirmation tank 40 are both in a closed state, so that the drain water is
It helps to move the drain water until it is discharged from 82.
The compressed air has a pressure of 0.01 to 0.7 MPa.

However, the oil floating separation chamber 11x of the oil separation tank 10
The oil and various foreign substances are separated by, for example, but the emulsified oil is dissolved in the drain water and the foreign substance capturing tank 20 is used.
Sent to.

Therefore, in the foreign matter capturing tank 20, the emulsified oil passes through the filter element 22 to separate the foreign matter and release the bond between water and oil of the emulsified oil to break the emulsion. Sometimes, the oil that has come off is coarsened. Then, while part of the separated oil is absorbed by the filter element 22, part of the separated oil, the remaining part of the emulsified oil and water are connected by the pressure of the compressed air to the connecting pipe 2
It is sent to the emulsion breaking oil adsorption tank 30 via 73.

On the other hand, in the emulsion breaking oil adsorbing tank 30, the adsorbent 32 with emulsion breaking particles to which the emulsion breaking particles are adhered by the drain water sent together with the compressed air and the oil adsorbing member 33 for adsorbing the oil are mixed almost uniformly. By allowing the adsorbent 32 with emulsion breaking particles and the oil adsorbent 33 to pass through at random in the stored state, the adsorbent 32 with emulsion breaking particles 32 By releasing the bond between water and oil in the emulsified oil, the emulsion is broken, and the separated oil is adsorbed, and the oil adsorbent 33 adsorbs the oil that could not be adsorbed by the adsorbent 32 with emulsion breaking particles. The cleanliness of the drain water is improved by randomly performing such treatment many times. Also,
When the drain water passes through the activated carbon 34, odors and pigments are removed.

In the present invention, the adsorbent 32 with emulsion breaking particles and the oil adsorbent 33 corresponding to the conventional ones are stored in separate tanks, or the adsorbent 32 with emulsion breaking particles or oil adsorbent 33 is stored. A plurality of sets corresponding to the material 33 are not alternately stacked and stored. The present invention is
An adsorbent 32 with emulsion breaking particles to which emulsion breaking particles were attached for the purpose of breaking the emulsion, and an oil adsorbing material 33 for adsorbing oil were stored in the emulsion breaking oil adsorbing tank body 31 in a substantially uniform mixture. It has a special feature.

As a result, by uniformly mixing the adsorbent 32 with emulsion-breaking particles and the oil adsorbent 33, the resistance when drain water flows is averaged, and the adsorption with emulsion-breaking particles, which has been observed in the past, is obtained. The unbalanced point that the resistance when drain water flows in the tank or layer corresponding to the material 32 is much higher than that in the tank or layer corresponding to the oil adsorbent 33 has been definitely solved.

In this way, depending on the amount of drain water and the degree of contamination, it is possible to deal with it by changing the mixing ratio of the adsorbent 32 with emulsion breaking particles and the oil adsorbent 33. In this case, since the adsorbent 32 with emulsion breaking particles and the oil adsorbent 33 are mixed, the emulsion breaking oil adsorbing tank 30 has a uniform resistance in all places, so that the drain water is drained to a specific channel. It is now possible to avoid the flow of.

Furthermore, it is possible to connect the foreign matter trap tank 20 and the emulsion breaking oil adsorption tank 30 by one, two, three, or more than one. In this case, when connecting a plurality of them, they are connected in parallel.

As one example, specifically showing how much amount is filled, it is 55 Kw to 11
For a drain generated from a 0 Kw screw type air compressor, a foreign matter capturing tank 20 and an adsorbent 32 with an emulsion-breaking particle of amine of 45 mm x 25 mm, which is a polypropylene non-woven fabric, is provided in a cylinder having an inner diameter of 200 mm and a height of 950 mm. 2.5 kg of 45 mm × 5 mm oil adsorbent 33, which is a polypropylene non-woven fabric filled with 2.5 kg.
The emulsion breaking oil adsorbing tanks 30 filled with 1 g of activated carbon 34 filled with g are connected in series and used in two rows in parallel.

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 in the lower part of the body of the clear water confirmation tank transparent body 41 is accumulated up to the height of the end of the outflow pipe 41c, and the pressure of the compressed air sealed in the upper part thereof causes the end of the outflow pipe 41c to end. The fresh water staying above the section is pumped together with the compressed air and discharged. At the same time, since the transparent main body 41 of the fresh water confirmation tank is transparent, it also serves as 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.

In this case, the performance of the oil / water separation device 1 is deteriorated by comparing with the transparent tube 11a which is the contamination degree confirmation means 11a of the oil separation tank 10 by various methods such as visual inspection, light transmission and light reflection. The foreign matter capturing tank 20
It is possible to appropriately determine the replacement time of the filter element 22 constituting the above, the adsorbent 32 with emulsion breaking particles and the oil adsorbent 33 constituting the emulsion breaking oil adsorption tank 30.

When the emulsion breaking oil adsorbing tank body 31 constituting the emulsion breaking oil adsorbing tank 30 is made of plastic, glass or the like to be transparent, it may be considered not to provide the fresh water confirmation tank 40. To be

[0076]

As is apparent from the above description, the following effects can be achieved by the present invention.

Firstly, the adsorbent with emulsion breaking particles to which the emulsion breaking particles are adhered and the oil adsorbing material for adsorbing oil are stored in the emulsion breaking oil adsorbing tank body in a substantially uniform mixture. , The resistance to the flow of drain water was the same at all locations in the emulsion-breaking oil adsorption tank, and the unbalanced point of high resistance when drain water flows through the adsorbent with emulsion-breaking particles was definitely eliminated.

Secondly, therefore, it becomes possible to select an intermediate compressed air pressure with respect to the high resistance of the conventional adsorbent with emulsion breaking particles and the low resistance of the oil adsorbent,
It became possible to set at a relatively low pressure.

Thirdly, it is further reduced that drain water flows only through a specific flow path.

Fourth, it is possible to more efficiently perform the emulsion destruction by releasing the bond between the water and the oil by draining the emulsion water in which a minute oil is combined with water to form an emulsion. Became.

Fifth, by arranging the adsorbent with emulsion-breaking particles and the oil adsorbent in combination, an oil-water separator having a higher capacity is possible.

Sixth, the emulsion breakage that releases the bond between the water and the oil of the drain water in which the minute oil binds with water to form an emulsion is added to the filter element, and the adsorbent 32 with emulsion breakage particles and the oil adsorbent 33 are added. You can do it more powerfully by going through multiple times.

Seventh, by using amine or barium sulfate as the emulsion breaking particles, the breaking of the emulsion can be dramatically advanced.

[Brief description of 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 that constitutes the oil-water separator of the present invention.

[Explanation of symbols]

1 --- Oil-water separator 10 --- Oil-separation tank 11 --- Oil-separation tank main body 11a-Transparent tube (pollution degree confirmation means) 11b- ..Suction pipe 11c ... Discharge pipe 11d ... Differential wall 11x ... Oil floating separation chamber 11y ... Water storage chamber 12 ... Pressure gauge 13 ...・ ・ ・ Floating oil extraction valve 20 ・ ・ ・ Foreign matter trap tank 21 ・ ・ Foreign matter trap 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 Strut 31e Intermediate perforated plate 31 f ... Support material 31z ... Space 32 ... Adsorbent with emulsion breaking particles 33 ... Oil adsorbent 34 ... Activated carbon 40 ...・ ・ ・ Fresh water confirmation tank 41 ・ ・ ・ ・ ・ Fresh water confirmation tank Transparent body (transparency confirmation means) 41a ・ ・ ・ Inflow passage 41b ・ ・ ・ ・ ・ Outflow passage 41c ・ ・ ・ ・ ・ Outflow pipe 42 ・・ ・ ・ ・ ・ Fresh water extraction valve 110 ・ ・ ・ ・ ・ Air compressor 120 ・ ・ ・ After cooler 130 ・ ・ ・ ・ ・ Air tank 140 ・ ・ ・ ・ ・ Dryer 150 ・ ・ ・ ・ ・ Filter 201 ・ ・ ・··· Compressed air pipe 202 ··· compressed air pipe 203 ··· 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 212b ... Drain discharge pipe 212c ... Drain discharge pipe 212d ... Drain discharge pipe 213a ... Drain discharge pipe 213b Drain 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, check valve 231, valve 232, drain trap 233 Check valve 241, ... Valve 242, Drain trap 243, Check valve 251, ... Valve 252, Drain trap 253, Check Valve 261 ... Meeting 262 ... Collecting pipe 265 ... Check valve 271 ... Connection pipe 272 ... Connection pipe 273 ... Connection pipe 274 ... Connection pipe 275 Check valve 281 Fresh water pipe 282 Fresh water pipe 285 Valve

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 17/025 B01D 17/025 17/04 501 501/04 501A 501B 501J 501L 17/05 501 17/05 501F 501J 17/12 17/12 Z C02F 1/40 C02F 1/40 E F04B 39/16 F04B 39/16 F

Claims (10)

[Claims] 1. An adsorbent (32) with emulsion breaking particles to which emulsion breaking particles are adhered and an oil adsorbing material (33) to adsorb oil are mixed substantially uniformly with drain water generated from compressed air. A drainage oil generated from compressed air is separated from the foreign matter centered on the oil contained in the drain water. 2. Drain water generated from compressed air is passed through a mixture of emulsion breaking particles and an oil adsorbent (33) for adsorbing oil, which is contained in the drain water. A method for separating oil-water from drained water generated from compressed air, characterized by separating foreign matter mainly from oil. 3. The adsorbent with emulsion breaking particles so that the drain water uniformly passes through the adsorbent (32) with emulsion breaking particles, the oil adsorbent (33) and the oil adsorbent (33). (32) and the oil adsorbent (3
3) and the adsorbent (32) with emulsion breaking particles, the oil adsorbent (33) and the part where the oil adsorbent (33) exists before and after passing through the oil adsorbent (33). The method for separating oil-water of drain water generated from compressed air according to claim 1 or 2, wherein a space (31z) having the same cross section as that of (1) is provided. 4. The drain water is 0.01 to 0.7 MP.
The oil-water separation method according to claim 3, wherein the drain water generated from compressed air is pressurized to a. 5. 0.01 to 0.7 generated from compressed air
In order to separate foreign matters centering on oil from the drain water pressurized to MPa, an adsorbent (32) with emulsion breaking particles to which emulsion breaking particles are attached and an oil adsorbent (33) that adsorbs oil are generally used. An oil-water separator for drain water generated from compressed air, comprising an emulsion-breaking oil adsorption tank (30) housed in a uniformly mixed state. 6. The emulsion breaking oil adsorption tank (30)
An oil / water separation device for drain water generated from compressed air according to claim 5, wherein an oil separation tank (10) for separating oil lighter than water or foreign matter heavier than water is disposed upstream of. 7. The emulsion breaking oil adsorption tank (30)
Emulsion destruction oil adsorption tank body (31)
Is made of a transparent material from which the inside condition can be visually observed from the outside, and the oil separation tank (10) is provided with a pollution degree confirming means (11a) from which the inside condition can be visually observed from the outside. The oil-water separator according to claim 6, wherein the drain water generated from the compressed air is used. 8. The emulsion breaking oil adsorption tank (30)
8. An activated carbon (34) for removing pigments and offensive odors is arranged so as to block the flow of the drain water over the entire cross section of the substantially central part of the above.
An oil-water separator for drain water generated from the compressed air according to the item. 9. The adsorbent (3) with the emulsion breaking particles
(2) is an oil / water separator for drain water generated from compressed air according to any one of claims 5 to 8, wherein emulsion breaking particles are attached to an adsorbent. 10. The oil-water separator according to claim 9, wherein the emulsion breaking particles are amine or barium sulfate.