JP3716323B2 - Oil water separation method and oil water separation device for drain water generated from compressed air - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for separating oil from drain water generated from compressed air. More specifically, the present invention relates to an oil-water separation apparatus. The present invention relates to a technique for enhancing the function of an emulsion breaking oil adsorption tank that adsorbs oil that has been detached.
[0002]
[Prior art]
Conventionally, as a technique related 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 foreign substances lighter than water and foreign substances heavier than water from dirty drain water.
[0003]
In addition, there were a filter, an oil adsorbent, an electrolysis, and a chemical.
[0004]
In addition, as a technique using an adsorbent with emulsion breaking particles, as shown in Japanese Patent Application Laid-Open No. 54-6352, an emulsion in wastewater is treated with a treatment material in which an amine or the like is attached to a support. A method of separating oil and water by performing two-stage treatment such as treatment with an oil adsorbent such as polypropylene after the particles are coarsened or broken is shown.
[0005]
Furthermore, as another technique using the adsorbent with emulsion breaking particles, as seen in Japanese Patent Application Laid-Open No. 2001-113269, an oil adsorbing layer composed of an oil adsorbing material having relatively low hydrophilicity and an emulsion treatment material are used. Or the oil-water separator which laminated | stacked multiple sets of emulsion decomposition layers which consist of an oil adsorbent with comparatively large hydrophilic property alternately was shown.
[0006]
In addition, in Japanese Patent Laid-Open No. 10-113655, the pressurized water from the pressurized air supply means is supplied from the lower part of the adsorption tank together with the drain water supplied from the storage tank, while stirring the drain water. A technique in which oil is absorbed by the adsorbent by bringing it into efficient contact with the adsorbent is shown.
[0007]
[Problems to be solved by the invention]
However, the conventional oil-water separation method and apparatus for separating water generated from compressed air have the following problems.
[0008]
First, separation of oil from drain water that is emulsified by the combination of minute oils with water is based on the difference in density between water and oil or foreign materials, by filters, or by oil adsorbents. It was almost impossible with a simple device such as. Further, the clogging due to the foreign matter is early, and the maintenance at that time is complicated.
[0009]
Secondly, the electrolysis and chemical chemicals required larger costs due to the larger equipment required for completeness.
[0010]
Thirdly, combining these methods to form an oil-water separator improves processing capacity, including emulsion breakage, but tends to be large and expensive, creating an efficient device. I had a hard time.
[0011]
Fourthly, in the two-stage process of emulsion breakage and oil adsorption, as disclosed in Japanese Patent Application Laid-Open No. 54-6352, a specific flow path is selected by selecting a channel through which drain water can easily flow. As a result, it was often necessary to replace the adsorbent at an early stage. In addition, because the emulsion breakage treatment material has more resistance than the oil adsorbent, the emulsion breakage treatment material has been reduced in capacity to balance the two, but on the other hand, it is not suitable for drainage water that is very dirty. The capacity of the emulsion breaking treatment material needs to be increased, and when trying to make it extremely large, when drain water flows, there is a problem that the resistance is not balanced.
[0012]
Fifth, in the oil-water separation apparatus in which a plurality of sets of oil adsorption layers and emulsion decomposition layers are alternately stacked, as seen in the published patent publication of JP-A-2001-113269, the treatment material for emulsion breakage is more resistant than the oil adsorption material. Therefore, the thickness of the emulsion decomposition layer was reduced in order to balance the two according to the resistance during flow.On the other hand, the thickness of the emulsion decomposition layer was reduced for dirty drain water. When it is necessary to make it thick, and when trying to make it extremely thick, there is a problem that when drain water flows, the resistance is not balanced.
[0013]
Sixth, in the oil-water separator as shown in Japanese Patent Application Laid-Open No. 10-113655, the drain water supplied from the storage tank and the pressurized air from the pressurized air supply means are supplied from the lower part of the adsorption tank. All of these are stored in a storage tank, and only pressurized air is sent from the pressurized air supply means, and equipment that generates drain water can send pressurized air at the same time. There was no idea of utilizing the characteristics.
[0014]
[Means for Solving the Problems]
The present invention separates oil that is lighter than water and foreign matters that are heavier than water from the drain water so that the upper part is exposed to the atmosphere. Open The drain water from the oil separation tank (10) and the drain water from the oil separation tank (10) are allowed to flow in and naturally discharged by the water head (H) which is the difference in height from the oil separation tank (10). In an oil-water separation method of drain water generated from compressed air that is made into fresh water by an emulsion breaking oil adsorption tank (30) that adsorbs the separated oil by breaking the bond between water and oil emulsified drain water. , Compressed air produced by the air compressor (110) is sequentially processed A plurality of devices (120, 130, 140, 150, 160) are collected in the oil separation tank (10) except for any one of drain water generated from compressed air, and a plurality of the devices (120, 130) are collected. 140, 150, 160), the drained water generated from the compressed air is reduced and the compressed air is used together with the compressed air. oil The drain water from the separation tank (10) and the emulsion breaking oil adsorption tank (30) are combined in the vicinity of the inlet, thereby giving an impact to the inside of the emulsion breaking oil adsorption tank (30). When one of the drain waters generated from the compressed air in the apparatus (120, 130, 140, 150, 160) is joined together with the compressed air in a decompressed state, it is fed at a constant period for a certain period of time. Furthermore, with the compressed air in a state in which one of the drain waters generated from the compressed air is decompressed by a plurality of the devices (120, 130, 140, 150, 160) in a reduced pressure state. What is merged is one that generates less drain water among the drain water generated from compressed air by a plurality of the devices (120, 130, 140, 150, 160). By wherein there La Defense, the above-mentioned problems are eliminated.
[0015]
In addition, the present invention provides drainage generated from compressed air in which an emulsion breaking oil adsorbing tank (30) for adsorbing the separated oil by breaking the emulsion by releasing the bond between the emulsified drain water and oil. In the oil-water separator for water, Compressed air produced by the air compressor (110) is sequentially processed Of drain water generated from compressed air by multiple devices (120, 130, 140, 150, 160) Any one of All drain water except for water is collected, and drain water generated from compressed air by a plurality of the devices (120, 130, 140, 150, 160) One removed The Drain water with compressed air Drain trap ( 222, 232, 242, 252, 262) Either When Pressure adjustable The drain water gathered together with the compressed air via the pressure reducing valve (263) was merged with the connection pipe (272) or the inlet side space (31z) upstream from the inlet of the emulsion breaking oil adsorption tank (30). Further, among drain water generated from compressed air by a plurality of the devices (120, 130, 140, 150, 160). Any one of All drain water except for water is separated from oils that are lighter than water and foreign substances that are heavier than water. Open A drainage water from the oil separation tank (10) is a height difference between the oil separation tank (10) and the emulsion breaking oil adsorption tank (30). H) is arranged so that drain water can flow into the emulsion breaking oil adsorption tank (30) and can be discharged naturally, and further, the drain trap ( 222, 232, 242, 252, 262) Either Is a constant time with a constant period Open In addition, a check valve (276) is disposed upstream of a position where the oil separation tank (10) and the emulsion breaking oil adsorption tank (30) merge. Further, the emulsion breaking oil adsorbing tank (30) is characterized in that the emulsion breaking particle-adsorbing material (32) to which the emulsion breaking particles intended for breaking the emulsion are adhered and the oil adsorbing material (32) for adsorbing oil. 33) and activated carbon (34) that removes pigments and off-flavors were accommodated to solve the above problems.
[0016]
DETAILED DESCRIPTION OF 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.
[0017]
As shown in FIG. 1, reference numeral 110 denotes an air compressor, which is not specifically shown, and is composed of a motor and a compressor. By transmitting the rotation of the motor to the compressor by a belt, compressed air is taken in while taking in the atmosphere. Is producing.
[0018]
Here, the compressed air produced 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, and compressed air piping 204. Compressed air is supplied to various pneumatic devices constituting actuators such as an air motor and an air cylinder via the pre-filter 150, the compressed air pipe 205, the mist filter 160, and the compressed air pipe 206. You can do that.
[0019]
In this case, the compressed air is dried by the aftercooler 120 and the dryer 140, and various foreign matters such as oil and solid matter are removed by the pre-filter 150 and the mist filter 160. It can be supplied to pneumatic equipment.
[0020]
On the other hand, from the aftercooler 120, a drain discharge pipe 211a, a valve 221 that can be opened and closed, a drain discharge pipe 211b, an electric drain trap 222 that discharges drain water together with compressed air by any signal, and a drain discharge The pipe 211c, a check valve 223 that prevents backflow from downstream to upstream, and a drain discharge pipe 211d are connected to the collecting pipe 291 so that drain water can be discharged.
[0021]
Moreover, from the lower part of the air tank 130 which stores compressed air, the drain discharge pipe 212a, the valve 231 which can be opened and closed, the drain discharge pipe 212b, and the electric motor which discharges drain water together with the compressed air by some signal. A drain trap 232 of the type, a drain distribution discharge 212c, a check valve 233 for preventing a reverse flow from downstream to upstream, and a drain discharge pipe 212d, connected to the collecting pipe 291 at the most upstream position, Drain water can be discharged.
[0022]
Furthermore, 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 that prevents a reverse flow from downstream to upstream, and a drain discharge pipe 213d are connected to the collecting pipe 291 so that drain water can be discharged.
[0023]
In addition, from the pre-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, The drain pipe 214c, the check valve 253 that prevents backflow from downstream to upstream, and the drain discharge pipe 214d are connected to the collecting pipe 291 so that drain water can be discharged.
[0024]
In addition, a drain discharge pipe 215a, an openable / closable valve 261, a drain discharge pipe 215b, and an electric motor that discharges drain water together with compressed air from any signal from the mist filter 160 located at the most downstream side. A drain trap 262, a drain discharge pipe 215c, a pressure-reducing pressure reducing valve 263, and a drain discharge pipe 215d are connected to the emulsion breaking oil adsorption tank 30.
[0025]
In FIG. 1, two filters 150 and 160 are provided. However, even if the filters 150 and 160 are combined into one along the compressed air pipes 205 and 206, more filters are provided. It doesn't matter. In that case, a filter that can capture a foreign substance that is as small as the filter disposed downstream is provided, and the filter located at the most downstream position is the emulsion breaking oil adsorption tank 30 via the drain discharge pipe in the same manner as the mist filter 160. It is desirable to connect a device other than the filter or filter located immediately before the most downstream to the collecting pipe 291 through the drain discharge pipe as in the pre-filter 150.
[0026]
Here, the collecting pipe 291 discharges fresh water via the fresh water pipe 281, the openable / closable valve 285, and the fresh water pipe 282 via the oil / water separator 1 that separates oil and various foreign substances. . The fresh water discharged from the fresh water pipe 282 is purified to such an extent that it can be discharged into a river or the like as it is.
[0027]
In this case, the oil / water separator 1 includes an oil separation tank 10, an emulsion breaking oil adsorption tank 30, and a fresh water confirmation tank 40, and the connection between the oil separation tank 10 and the emulsion breaking oil adsorption tank 30 is opposite to that of the connecting pipe 271. The stop valve 276 is connected to the connection pipe 272, and the connection pipe 272 feeds drain water from the inlet 31 aa formed in the emulsion breaking oil adsorption tank body 31 to the space 31 z, and the emulsion breaking oil adsorption tank 30 and the fresh water confirmation tank 40. Are connected by a connecting pipe 273. The oil separation tank 10 may be a tank that simply stores oil, or the fresh water confirmation tank 40 may be omitted.
[0028]
The mist filter 160 also directly enters the emulsion breaking oil adsorption tank 30 via the drain discharge pipe 215a, the valve 261, the drain discharge pipe 215b, the drain trap 262, the drain discharge pipe 215c, the pressure reducing valve 263, and the drain discharge pipe 215d. As long as drain water or compressed air is supplied and the pressure reducing valve 263 functions similarly, other devices may be used. Further, the pressure reducing valve 263 may be provided at any position between the mist filter 160 and the emulsion breaking oil adsorption tank 30.
[0029]
On the other hand, the drain discharge pipe 215d from the mist filter 160 is connected to an inlet 31ab formed in the emulsion breaking oil adsorption tank main body 31 so as to feed compressed air and drain water into the space 31z. It may be connected to the connecting pipe 272 from the separation tank 10.
[0030]
Next, the oil separation tank 10 is composed of an oil separation tank main body 11 and a discharge pipe 12, and the upper part is open to the atmosphere, and the drain water fed into the oil separation tank 10 is on the liquid level. Oil that is lighter than water floats and foreign matter heavier than water settles at the bottom, and drain water that is trying to accumulate above the branched discharge part of the discharge pipe 12 flows from the lower part of the discharge pipe 12. And it is always sent as a comparatively clean drain water to the connecting pipe 271 from the branched discharge part.
[0031]
Here, as the height of the position of the branched discharge part from which drain water flows out from the discharge pipe 12 of the oil separation tank 10, the outlet 31b formed in the emulsion breaking oil adsorption tank 30 installed downstream thereof. By securing the head H between the connection pipe 273 and the highest position of the connection pipe 273, the drain water flowing out of the oil separation tank 10 does not require power, and the emulsion breaking oil adsorption tank 30 It is possible to escape.
[0032]
However, in this case, a part of the water was in the state where water and oil were combined as emulsion drain water, and the oil separated tank 10 was flowing out without being completely separated into water and oil.
[0033]
In addition, if the oil separation tank main body 11 is made of a transparent container such as glass or plastic, the position of the water surface can be easily seen. Further, the upper part of the discharge pipe 12 is open to the atmosphere.
[0034]
However, a pressure-reducing pressure reducing valve 263 is provided between the mist filter 160 and the emulsion breaking oil adsorbing tank 30, and the pressure reducing valve 263 can set a value of 0.01 to 0.7 MPa. In addition, the pressure of the compressed air is reduced to about 0.2 MPa and is sent to the emulsion breaking oil adsorption tank 30 together with drain water. In this case, depending on the situation where the function of the emulsion breaking oil adsorption tank 30 is lowered, the pressure may be increased by adjusting the pressure reducing valve 263. Also, drain trap 262 Can be opened for a certain period of time with a set constant period.
[0035]
In this case, as shown in FIG. 2, the emulsion breaking oil adsorption tank 30 has activated carbon 34 for removing pigments and off-flavors in the emulsion breaking oil adsorption tank body 31, and drain water in the entire cross section at the center. The mixture of the adsorbent 32 with emulsion breaking particles to which the emulsion breaking particles intended to break the emulsion and the oil adsorbing material 33 intended to adsorb oil are mixed in a substantially uniform manner. 34 is stored before and after 34.
[0036]
In addition, the emulsion breaking oil adsorption tank body 31 can be made of a transparent material such as glass or plastic so that the state of internal contamination can be seen from the outside, and the state of internal contamination can be seen from the outside. It is also possible to insert a transparent material such as glass or plastic.
[0037]
Incidentally, the adsorbent 32 with emulsion breaking particles releases the oil-water bond by emulsion breaking the drained water that has been emulsified by the action of the emulsion breaking particles and the minute oil is combined with water, and then the separated oil. Is adsorbed by the adsorbent and the oil adsorbent 33 constituting the adsorbent 32 with emulsion breaking particles. Therefore, the presence of the adsorbent 32 with emulsion breaking particles and the oil adsorbent 33 is scattered, so that the oil can be removed by completely separating and adsorbing the oil from the emulsified drain water.
[0038]
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 oil separation / adsorption tank 30, the activated carbon 34 gets dirty early in the uppermost stream and the activated water 34 itself flows out in the downstream, so that it looks like dirty water flows. In addition, it is desirable to be positioned approximately at the center.
[0039]
Here, as the structure of the emulsion breaking oil adsorption tank main body 31, the drain water which is liquid flows into the emulsion breaking oil adsorption tank main body 31 from the inlet 31a and is discharged from the outlet 31b. Space portions 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.
[0040]
Accordingly, in order to secure the space portion 31z at both ends, two porous plates 31c having a large number of small holes are prepared, and the porous plate 31c and the end portions 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 diameter smaller than that of the emulsion breaking oil adsorbing tank main body 31 therebetween, and the adsorbent 32 with emulsion breaking particles, the oil adsorbing material 33, and the activated carbon 34 are used as two porous plates. It is made to accommodate between 31c. However, the column 31d is not necessarily limited to a cylindrical shape, and may be any shape as long as the space 31z can be secured. As the perforated plate 31c, a punching plate in which many small holes are formed, a ceramic resin, or the like can be considered.
[0041]
Also, the adsorbent 32 with emulsion breaking particles and the oil adsorbent 33 increase in resistance as they absorb foreign substances such as oil, and are pressed toward the downstream while being compressed. The drainage water emulsion breakage and oil adsorption function are reduced.
[0042]
Therefore, in order to prevent this even a little, an 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 body 31 is disposed so that the flow of liquid can be blocked vertically. In order to support the intermediate porous plate 31e, a cylindrical support material 31f having a smaller diameter than the oil separation / adsorption tank body 31 is disposed between the intermediate porous plate 31e and the porous plate 31c located on the downstream side. This prevents the adsorbent 32 with emulsion breaking particles and the oil adsorbent 33 from being completely compressed.
[0043]
However, the position of the intermediate porous plate 31e may be slightly back and forth around the substantially central portion of the oil separation / adsorption tank body 31. Further, the support material 31f is not limited to a cylindrical shape, and any shape can be used as long as the intermediate porous plate 31e fixed with several bolts can be supported.
[0044]
Incidentally, as shown in FIG. 2, it is best to fill the emulsion breaking oil adsorbing tank main body 31 with the activated carbon 34 immediately after the downstream of the intermediate porous plate 31e, but it is charged immediately before the upstream of the intermediate porous plate 31e. There is a near-best effect. On the other hand, even if the intermediate porous plate 31e is filled somewhat before and after, a considerable effect is seen, and even if it is filled in either part of both ends of the emulsion breaking oil adsorption tank main body 31, a certain effect is seen.
[0045]
Here, as a method of making the adsorbent 32 with emulsion breaking particles in which emulsion breaking particles are adhered to the adsorbent, a solution in which emulsion breaking particles such as amine and barium sulfate are dissolved in a solvent is adhered to the adsorbent. A method of evaporating and drying the solvent later is common, but there is also a method of spraying the solution onto the oil adsorbent 33 in a mist form. Further, a method is also conceivable in which the emulsion breaking particles such as amine and barium sulfate are attached to the adsorbent in a state of being uniformly mixed in the liquid instead of being dissolved.
[0046]
In this case, the emulsion breaking particles and the adsorbing material may be packed so as to be dispersed in a dispersed state between the adsorbing materials without being in the state of the adsorbent 32 with emulsion breaking particles. Also in this case, the activated carbon 34 may be disposed immediately before or immediately upstream of the intermediate porous plate 31e or in the vicinity thereof, or may be disposed immediately before or immediately before the porous plate 31c at the inlet or outlet.
[0047]
However, in any of the cases described above, a configuration in which the activated carbon 34 is not disposed is also conceivable.
[0048]
On the other hand, with respect to the amine used in the present invention, an amine compound or a derivative thereof can be considered, and when the amine compound or the derivative thereof is 25 ° C., it is preferably solid, but the compound is non-solid at 25 ° C. However, it may be a compound that becomes a solid in a mixture with other compounds. That is, the compounds may be used alone or in combination of two or more.
[0049]
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, particularly preferably. Are primary amines (eg stearylamine) and derivatives thereof.
[0050]
Examples of these amine compounds include primary amines such as hexylamine, hebutylamine, octylamine, nonylamine, decylamine, laurylamine, myristylamine, palmitylamine, oleylamine, stearylamine, or hydrocarbon chains thereof. Secondary amines such as diamines and triamines, and tertiary amines, or their picrads, various salts (for example, salts of hydrochloric acid, sulfuric acid, phosphoric acid, carbonic acid, acetic acid, etc.), and these hydrocarbon chains Primary amines, secondary amine acid amides, amidines, ureas, thioureas, and primary amine Schiff bases.
[0051]
As the amide, sulfonamides such as p-toluenesulfonyl-N-stearylamide and N-stearylacetamide are preferable. Moreover, the quaternary ammonium salt, betaine, etc. which have these hydrocarbon chains are mentioned. Furthermore, for example, polyvalent amines such as stearyl propylene diamine and semi-cured beef tallow diamine can be used. Furthermore, it is also possible to use a mixture of amines having hydrocarbon chains having different carbon numbers such as hardened beef tallow amine and coconut amine.
[0052]
Further, as the adsorbent used for the oil adsorbent 33 and the adsorbent 32 with emulsion breaking particles, one made of polypropylene or polystyrene fibers 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, and may be any one that has an oil adsorption function and is water-insoluble. Other things can be used.
[0053]
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. Is a size of (30 mm to 80 mm) × (5 mm to 40 mm). In particular, it is most preferable to prepare two types of 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 viewpoint, this can be said to be close to the idea of preparing two types of small pieces of 100 mm x 50 mm or less and 3 to 10 times different in area. It can be said that it is ideal to prepare two kinds of small pieces of 60 mm × 40 mm or less and different sizes of 4 to 8 times in area.
[0054]
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 emulsion breaking particles is filled in the emulsion breaking oil adsorption tank main body 31, it is too large. Since it is difficult to fill a large amount due to the large gap, it becomes difficult to obtain a large surface area, and because there are many parts that are forcedly compressed, such parts break down the emulsified oil And the function of adsorption is reduced, and the performance cannot be ensured by reducing the amount to be filled. Deterioration of functions is accelerated, and it is troublesome to cut, and it is troublesome to perform various management.
[0055]
In addition, the use of two types of sizes means that by preparing two types of small pieces of different sizes, adding small ones to the large gaps and unreasonable compression that are issues with increasing the size It has a great meaning that it can be compensated by adding a large thing to the early decline in function, which is a problem of making it small at the same time.
[0056]
As for the two kinds of small pieces, it is best to use two kinds of small pieces for both the adsorbent used for the oil adsorbent 33 and the adsorbent 32 with emulsion breaking particles. A small piece and a large piece may be used for the adsorbent used for the adsorbent 32 with emulsion breaking particles, or vice versa.
[0057]
In addition, as another application example of the emulsion breaking oil adsorbing tank 30, activated carbon 34 is disposed in the substantially central portion of the emulsion breaking oil adsorbing tank main body 31, and emulsion breaking is performed by attaching emulsion breaking particles for the purpose of breaking the emulsion. It is also conceivable that layers of adsorbents with particles 32 and layers of oil adsorbents 33 intended to adsorb oil are alternately formed and stored before and after activated carbon 34.
[0058]
Finally, the fresh water confirmation tank 40 is comprised from the fresh water confirmation tank transparent main body 41 and the fresh water extraction valve 42 which can be opened and closed connected to the bottom part. In this case, the clear water confirming tank transparent main body 41 is made of plastic or glass, and is configured such that the main body portion and the lid portion are transparent and can be visually inspected for contamination from the outside. The inflow passage 41a, the outflow passage 41b, and the outflow pipe 41c are not specifically illustrated in the lid portion of the clear water confirmation tank transparent main body 41, but are formed in a sealed state with an O-ring or the like, The outflow pipe 41c is connected to the fresh water pipe 281 through the outflow path 41b.
[0059]
An oil-water separation method and an 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.
[0060]
First, when the motor composing the air compressor 110 is operated, the rotation of the motor is transmitted to the compressor via a belt to generate compressed air. Here, the produced compressed air is compressed air piping 201, aftercooler 120, compressed air piping 202, air tank 130, compressed air piping 203, dryer 140, compressed air piping 204, and prefilter. 150, compressed air piping 205, mist filter 160, and compressed air piping 206 are sent out to the various pneumatic devices that constitute the actuator at the tip of the compressed air as necessary. It can be done.
[0061]
On the other hand, the drain water generated from the compressed air by the aftercooler 120, the air tank 130, the dryer 140, and the prefilter 150 together with the compressed air, the drain discharge pipes 211a, 212a, 213a, 214a, the valves 221, 231, 241, 251 and the drain. Drain pipes 211b, 212b, 213b, 214b, drain traps 222, 232, 242, 252 and drain discharge pipes 211c, 212c, 213c, 214c, check valves 223, 233, 243, 253 and drain discharge pipes 211d, 212d, 213d , 214d and merged in the collecting pipe 291 and sent to the oil / water separator 1, where the oil / water separator 1 removes various foreign substances including oil, and passes through the fresh water pipe 281, the valve 285, and the fresh water pipe 282. Clean water so that there is no problem even if it is discharged directly into the river. So that the can.
[0062]
The drain water generated from the compressed air by the mist filter 160 passes through the drain discharge pipe 215a, the valve 261, the drain discharge pipe 215b, the drain trap 262, the drain discharge pipe 215c, the pressure reducing valve 263, and the drain discharge pipe 215d together with the compressed air. And it sends to the emulsion breaking oil adsorption tank 30 which comprises the oil-water separator 1. FIG.
[0063]
In this case, in the oil / water separator 1, the drain water sent from the collecting pipe 291 first causes the oil, which is lighter than water, to float on the water surface and causes various foreign substances heavier than water to settle at the bottom. The emulsion breaker oil adsorbing tank 30 is fed from the lower part of the discharge pipe 12 through the branch part, through the connecting pipe 271, the check valve 276 and the connecting pipe 272. However, this drain water is often sent into the emulsion breaking oil adsorption tank 30 in a state where it is emulsified and the water and oil are combined.
[0064]
On the other hand, in the emulsion breaking oil adsorption tank 30, the drain water from the oil separation tank 10 and the drain water sent together with the compressed air from the mist filter 160 adsorb the adsorbent 32 with emulsion breaking particles and the oil adhering the emulsion breaking particles. The drain water passes through the adsorbent with emulsion breaking particles 32 and the oil adsorbent 33 at random while the oil adsorbent 33 to be stored is contained in a substantially uniformly mixed state. In addition to the breakage, the adsorbent 32 with emulsion breakage particles releases the bond between the water and the oil that has been emulsified to cause the emulsion breakage to adsorb the separated oil, and the oil adsorbent 33 adsorbs with the breakage particles. The oil that could not be adsorbed by the material 32 is adsorbed, and the treatment of the drain water is carried out by repeatedly performing such treatment repeatedly. Thereby improving the degree. Further, when the drain water passes through the activated carbon 34, odors and pigments are removed.
[0065]
In this case, the drain water sent together with the compressed air from the mist filter 160 is set to be fed for a certain period of time with a certain period. Therefore, in the emulsion breaking oil adsorption tank 30, the intermittent flow is applied by the compressed air, so that the drain water passes through the adsorbent 32 with the emulsion breaking particles and the oil adsorbent 33, so that a specific flow occurs. The formation of a path is prevented, or only a specific part is contaminated and the adsorbent 32 with emulsion breaking particles and the oil adsorbent 33 are prevented from being exchanged at an early stage. Here, if the pressure of the compressed air is increased by adjusting the pressure reducing valve 263, the strength of the impact can be increased.
[0066]
In addition, the technique which tries to send drain water or compressed air from the mist filter 160 of the present invention is the one corresponding to the adsorbent 32 with emulsion breaking particles or the oil adsorbent 33 as shown in the prior art. The present invention can also be applied to those technologies that are housed in separate tanks or in which a plurality of sets corresponding to the adsorbent 32 with emulsion breaking particles and the oil adsorbent 33 are alternately stacked. In this case, the present invention provides an emulsion breaking oil in a state where the adsorbent 32 with emulsion breaking particles to which emulsion breaking particles for the purpose of emulsion breaking are adhered and the oil adsorbing material 33 that adsorbs oil are mixed almost uniformly. It is also characterized by being housed in the adsorption tank body 31.
[0067]
Also, as an example, specifically showing how much is filled, drain water generated from a 55 Kw to 110 Kw screw type air compressor is approximately 200 mm in inner diameter and 950 mm in height. A 45 mm × 5 mm oil adsorbent, which is a polypropylene non-woven fabric, is filled with 2.5 kg of a 45 mm × 25 mm amine adsorbent with emulsion break particles, which is a polypropylene non-woven fabric, in a cylindrical emulsion break oil adsorbing tank body 31. The emulsion breaking oil adsorption tanks 30 filled with 2.5 kg of 33 and 1 kg of activated carbon 34 are used in such a manner that two rows are installed in parallel.
[0068]
Finally, the clean fresh water discharged from the emulsion breaking oil adsorption tank 30 is sent into 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 clear water confirmation tank transparent main body 41 accumulates up to the height of the end of the outflow pipe 41c, and from the end of the outflow pipe 41c by the pressure of the compressed air sealed in the upper part. The fresh water staying in the upper part is pumped together with the compressed air and discharged from the fresh water pipe 281. At the same time, it is possible to confirm that the fresh water confirmation tank transparent main body 41 is transparent, so that the fresh water flowing inside is confirmed.
[0069]
In addition, when making the emulsion breaking oil adsorption tank main body 31 which comprises the emulsion breaking oil adsorption tank 30 transparent by plastics, glass, etc., it is also considered that the fresh water confirmation tank 40 is not arrange | positioned. Moreover, although the emulsion breaking oil adsorption tank 30 has shown the sealed type in the Example of this invention, you may make it the state open | released to air | atmosphere.
[0070]
Further, after the compressed air is generated by the air compressor 110, the compressed air generates drain water in the middle of passing through the plurality of devices 120, 130, 140, 150, 160. The drain water generated in the mist filter 160 is decompressed together with the compressed air and sent directly to the emulsion breaking oil adsorption tank 30, but it may be sent from another device, in which case the amount of drain water generated is small A device is more desirable.
[0071]
【The invention's effect】
As is clear from the above description, the present invention can provide the following effects.
[0072]
First, by connecting a pipe between the mist filter and the emulsion breaking oil adsorption tank and providing a pressure reducing valve, it is compressed into the emulsion breaking oil adsorption tank while using the compressed air produced by the air compressor to drain water. Air can be sent in.
[0073]
Second, by connecting the mist filter and the emulsion breaking oil adsorption tank with a pipe and providing a drain trap, it becomes possible to feed the compressed air used to drain the drain at a constant cycle for a fixed time. .
[0074]
Third, by sending compressed air at a constant period for a certain period of time, it is possible to give an intermittent impact to the emulsion breaking oil adsorption tank, and the adsorbent with emulsion breaking particles and the oil adsorbent can be used for a long time. It became so.
[0075]
Fourth, the problem of balance has been solved by mixing the adsorbent with emulsion breaking particles and the oil adsorbent in the emulsion breaking oil adsorption tank and storing the activated carbon 34 therein.
[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 the oil / water separator according to the present invention.
[Explanation of symbols]
1. Oil / water separator
10 .... Oil separation tank
11 .... Oil separation tank body
12 .... Discharge pipe
30 ... Emulsion breaking oil adsorption tank
31 ... Emulsion breaking oil adsorption tank body
31aa ... Inlet
31ab ... ・ Inlet
31b ... Outlet
31c: Perforated plate
31d ... prop
31e: Intermediate perforated plate
31f: Support material
31z: Space
32 ... Adsorbent with emulsion breaking particles
33 ... ・ Oil adsorbent
34 ... Activated carbon
40 ・ ・ ・ ・ ・ ・ Clear water confirmation tank
41 ... ・ Clear body of clear water confirmation tank
41a: Inflow channel
41b ... Outflow path
41c ... Outflow pipe
42 ... Shimizu valve
110 ・ ・ ・ ・ ・ Air compressor
120 ... After-cooler
130 ... Air tank
140 ... Hair dryer
150 ... Pre-filter
160 ... Mist filter
201 ... compressed air piping
202... Compressed air piping
203 ... Compressed air piping
204 ...... Compressed air piping
205 ... Compressed air piping
206 ・ ・ ・ ・ ・ Compressed air piping
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
215a ... Drain discharge pipe
215b ... Drain discharge pipe
215c ... Drain discharge pipe
215d ... 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 ... Valve
262 ... Drain trap
263 ... Pressure reducing valve
271 ... Connection pipe
272 ... Connection pipe
273 ... Connection pipe
276 Check valve
281 ... Shimizu pipe
282 ... Shimizu pipe
285 ... Valve
291: Collecting pipe
H ...

Claims (8)

An oil separation tank (10) that separates oil lighter than water and foreign substances heavier than water from the drain water and opens the upper part to the atmosphere, and drain water from the oil separation tank (10) is the oil separation tank (10). Emulsion-breaking oil adsorption that adsorbs the released oil by breaking the emulsion by releasing the bond between water and oil that has been emulsified and drained by the head (H) that is the difference in height from the water In the method for separating drain water generated from compressed air to be purified by the tank (30), a plurality of devices (120, 130, 140, 150, 160) that sequentially process the compressed air produced by the air compressor (110 ). One of drain water generated from compressed air is collected in the oil separation tank (10), and a plurality of the devices (120, 130, 140, 150, 16 ) At the joining drain water and the emulsion breaking oil adsorption tank (30) in the vicinity inlet from the oil separation tank with the excluded one compressed air while vacuum ones of drain water generated from the compressed air (10) An oil-water separation method of drain water generated from compressed air, characterized in that an impact is given to the inside of the emulsion breaking oil adsorption tank (30).   When a plurality of the devices (120, 130, 140, 150, 160) are joined together with the compressed air in a state where the drained water generated from the compressed air is decompressed, a certain period of time The method for separating drain water generated from compressed air according to claim 1, wherein the oil is fed.   A plurality of the devices (120, 130, 140, 150, 160) may be joined together with the compressed air in a state where the drained water generated from the compressed air is decompressed. , 130, 140, 150, 160), which is generated from the compressed air according to claim 1, wherein the drain water is generated from the compressed air in a small amount. Oil water separation method of drain water. In an oil-water separator for drain water generated from compressed air provided with an emulsion breaking oil adsorbing tank (30) for desorbing the emulsion by releasing the bond between water and oil in the drained emulsion water and adsorbing the separated oil All drains except for one of the drain waters generated from the compressed air by a plurality of devices (120, 130, 140, 150, 160) that sequentially process the compressed air produced by the air compressor (110) A drain trap ( 222, 222) that collects water and discharges one of the drain waters generated from the compressed air by the plurality of devices (120, 130, 140, 150, 160) together with the compressed air . 232,242,252, were assembled together with the compressed air through either of 262) adjustable pressure reducing valve pressure (263) de And an apparatus for separating drain water generated from compressed air, wherein the water is combined in a connecting pipe (272) or an inlet side space (31z) upstream from the inlet of the emulsion breaking oil adsorbing tank (30). . All drain water except one of drain water generated from compressed air by a plurality of the devices (120, 130, 140, 150, 160) is separated from oil that is lighter than water and foreign matters that are heavier than water. In the oil separation tank (10) whose upper part is opened to the atmosphere, drain water from the oil separation tank (10) is collected between the oil separation tank (10) and the emulsion breaking oil adsorption tank (30). 5. The compressed air according to claim 4, wherein the compressed air is arranged such that drain water can flow into the emulsion breaking oil adsorbing tank (30) by a water head (H) having a height difference and can be discharged naturally. An oil-water separator for drain water generated from the water. The drain trap (222,232,242,252, 262) is one of, generated from the compressed air according to claim 4 or claim 5, characterized in that it is possible certain time opened at a fixed period Oil / water separator for drain water. Upstream of a position of confluence between the oil separation tank the emulsion breaking oil adsorption tank (10) (30), in claim 5 or claim 6, characterized in that disposed a check valve (276) An oil-water separator for drain water generated from the compressed air described.   The emulsion breaking oil adsorption tank (30) is composed of an adsorbent with emulsion breaking particles (32) to which emulsion breaking particles intended to break the emulsion are adhered, an oil adsorbing material (33) intended to adsorb oil, a dye and a strange odor. The apparatus for separating drain water from drained water generated from compressed air according to any one of claims 4 to 7, wherein activated carbon (34) for removing water is stored.

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