JP2001300539A - Drain cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drain cleaning device for increasing electric conductivity of drain to facilitate a flow of an electric current in the case that the electric conductivity of drain is low, and enhancing oil/water separation performance of the drain. SOLUTION: This drain cleaning device is provided with an electrolytic separation tank having at least a pair of electrodes in the inside and separating the drain turbid with oil and water to the oil and water, a sub-tank for storing the drain, and a piping part for connecting these. This device is provided with a heating means for heating at least any drain liquid among the drain liquids in the insides of the electrolytic separation tank, the sub-tank or the piping from the sub-tank to the electrolytic separation tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain purifying apparatus, and more particularly to a drain purifying oil and water discharged from an air compressor, which is separated and agglomerated into oil and water in an electrolytic separation tank, and the oil is floated. The present invention relates to a drain purifier that separates oil and water into a creamy scum containing oil as a main component and clean water.

[0002]

2. Description of the Related Art A conventional drain purifier will be described with reference to FIG. In FIG. 7, an electrolytic separation tank 3 having at least one pair of positive and negative electrodes 1a and 1b therein and filled with a drain 2 is disposed at the top of the apparatus. A sub-tank 4 for storing the drain 2 discharged from the air compressor is disposed at the lower part of the apparatus. The drain 2 is separated by a drain supply pump 5 from an electrolytic separation tank lower supply port 3a through a pipe 6 by an electrolytic separator. It is supplied to the tank 3.

The drain 2 is generated in a process in which air is compressed by a compressor and further cooled by an aftercooler, and most of the water formed by condensation of moisture in the air is compressed. An oil component 2a, which is a mechanical lubricating oil, and a floating substance 2b composed of dust mixed in air, metal abrasion powder on a sliding portion of a compressor component, and the like are included.

[0004] The oil 2a and the floating substance 2b contained in the drain 2 form minute air bubbles 7 generated at the electrodes 1a and 1b.
As a result, the scum 8 is carried upward while increasing in size and becomes a creamy scum 8. The scum 8 is accumulated in a scum receiver 10 beside the electrolytic separation tank by a scum scraping device 9 that intermittently scrapes the scum.

On the other hand, the water 2c remaining after the oil-water separation is:
It flows out to the specific gravity difference tank 11 provided in the electrolytic separation tank 3 and is sent to the filter function unit 13 through the pipe 12 from the specific gravity difference tank outlet 11a above the liquid level. Here, fine solid substances are further captured and, after being filtered, discharged as clean water.

[0006]

The water in the drain 2 discharged from the air compressor is a condensation of moisture in the air. Therefore, in the state of the atmospheric temperature, the electrolyte is water having a very low ion content, and its electric conductivity value is small.

For this reason, in the above-mentioned prior art, oil / water separation treatment is performed in the electrolytic separation tank 3 using the drain 2 having a low electric conductivity as an electrolyte, but the electric resistance between the electrodes 1a and 1b is large, so that the current hardly flows. ing. The aforementioned electrical conductivity is a physical quantity defined as the reciprocal of electrical resistance,
When the electric conductivity value is small, the value of the current flowing through the electrolyte between the electrodes is small, the amount of microbubbles generated as a result is small, the oil / water separation function is low, and thus the drain purification ability is low.

[0008] It is an object of the present invention to provide a drain purifying apparatus capable of increasing the drain current, when the electric conductivity of the drain is low, to facilitate the flow of electric current and improving the oil / water separation function of the drain.

[0009]

In order to achieve the above object, the present invention is characterized in that at least one
In a drain purifier having a pair of electrodes, an electrolytic separation tank for separating oil-water turbid drain into oil-water, a sub-tank for storing the drain, and a pipe connecting these, in the electrolytic separation tank or the sub-tank There is provided a means for heating at least one of the drain liquids inside or in the pipe from the sub tank to the electrolytic separation tank.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a drain purifying apparatus for heating a drain liquid by an electric heater according to an embodiment of the present invention. Portions having the same functions as those of the prior art shown in FIG. I do.

The drain 2 used here is mainly composed of oil and moisture, and most of the moisture is generated by condensing high-temperature and high-pressure discharge air compressed by a compressor when the air is cooled by an aftercooler. Is what you do. Therefore, the electrolyte is water having a very low ion content, and the value of the electric conductivity is generally in the range of 10 to 20 μS / cm.

In FIG. 1, an electric heater 14 and a temperature detector 16 are provided in the electrolytic separation tank 3, and a controller 15 of the electric heater 14 controls the drain liquid in the electrolytic separation tank 3 to a predetermined temperature.

The electric conductivity of the drain 2 has a characteristic that it increases as the temperature rises, and it can be heated within the allowable temperature range of the component parts of the device. That is, the drain is mostly water, and the electrical conductivity of water is sensitive to temperature, and increases at a rate of about 2% / ° C. near normal temperature. Therefore, the electric conductivity increases as the temperature increases.
Therefore, the drain liquid can be heated within a range not more than the minimum heat-resistant temperature of the component of the device. For example, when the heat resistance temperature of the lipophilic filter medium used for the filter function unit 13 is the lowest among the component parts of the apparatus (often about 60 ° C. or less), the electrolytic separation is performed in consideration of heat radiation in the pipe 12 and the like. The temperature of the drain liquid in the tank 3 can be heated to about 60 ° C.

Therefore, the value of the electric conductivity of the drain 2 after being heated is large, and the drain 2 can be satisfactorily applied to the electrolyte between the electrodes 1a and 1b without increasing the DC voltage for electrolytic separation. Electric current flows, and the generation of microbubbles from the electrode surface becomes active, and the oil-water separation function is improved.

Since the electric heater 14 is provided in the lower part of the electrolytic separation tank 3, the convection of the drain 2 is promoted, the bubble rise is improved, and the scum floating is accelerated.

Further, another embodiment in which the drain liquid is heated by an electric heater will be described with reference to the schematic configuration diagrams of FIGS. FIG. 2 shows a configuration in which an electric heater 17 is provided in the lower portion of the sub tank 4, the temperature is detected by a temperature detector 16 in the electrolytic separation tank 3, and the temperature of the drain liquid is controlled by a controller 18 of the electric heater 17. It is. Since the heating here is on the upstream side of the drain supply pump 5, it is mixed by the pump and is effective in making the temperature uniform.

FIG. 3 shows that a flexible electric heater 19 is wound around all or a part of the surface of the pipe 6 from the sub tank to the electrolytic separation tank, and the temperature detector 1 in the electrolytic separation tank 3 is provided.
6, the temperature is detected, and the controller 2 of the electric heater 19 detects the temperature.
At 0, the temperature of the drain liquid is controlled.

In this case, the operation can be performed simply by winding a tape-shaped electric heater around the pipe, and the structure is simple. Further, the entire surface of the pipe can be heated, and the heat exchange effect is large.

The temperature of the drain liquid in these embodiments can be set to an arbitrary value by the controllers 15, 18, and 20, respectively. Since the characteristics of the drain 2 vary depending on the specifications, installation location, season, etc. of the air compressor, in actual operation, the set temperature value is measured in advance by measuring the electric conductivity of the drain 2 at the start of operation, and the fluctuation range Predict and set.

Hereinafter, an example of the setting will be described. Usually, the electric conductivity of the drain liquid is approximately 10 to 20 μS /
cm. Considering this as 20 μS / cm, 40 μS / c
m, it is necessary to set the drain liquid temperature to a temperature raised by about 50 ° C. (Note: 20 × (100.02 △ T) = 40... △ T = 5
0) In consideration of the minimum heat-resistant temperature in the above-mentioned device components, the set temperature should be set to the minimum heat-resistant concentration if the minimum heat-resistant temperature is higher than + ΔT. If the lowest heat-resistant temperature is lower, the lowest heat-resistant temperature is set as the upper limit and the lowest heat-resistant temperature is set as the set temperature.

Further, as another embodiment of the present invention, an example of a heating means in which a part of the high-temperature discharge air of the air compressor is diverted will be described with reference to schematic configuration diagrams of FIGS. 4, 5 and 6.

FIG. 4 shows that a high-temperature discharge air heat exchanger 21 is provided in the lower part of the electrolytic separation tank 3, the temperature is detected by the temperature detector 16 in the electrolytic separation tank 3, and the control valve 23 is controlled by the controller 22. The temperature of the drain liquid is controlled by adjusting the flow rate of the high-temperature discharge air through the control unit.

FIG. 5 shows that a high-temperature discharge air heat exchanger 24 is provided in the lower part of the sub-tank 4, the temperature is detected by the temperature detector 16 in the electrolytic separation tank 3, and the high-temperature is detected by the controller 25 through the control valve 26. The flow rate of the discharge air is adjusted to control the temperature of the drain liquid.

FIG. 6 shows that all or part of the pipe 6 from the subtank to the electrolytic separation tank is a heat exchanger 27 for high-temperature discharge air having a double pipe structure, and the temperature is detected by the temperature detector 16 in the electrolytic separation tank 3. The controller 28 detects the control valve 2
9, the flow rate of the high-temperature discharge air is adjusted to control the temperature of the drain liquid.

The high-temperature discharge air used as a heating means in these embodiments is usually 90 ° C. to 130 ° C. and can be sufficiently used as a heating source, and an after-cooler of an air compressor after use (illustration is omitted). By returning to the above, the original air source is not wasted.

Furthermore, if the high-temperature discharge air of the air compressor for discharging the drain handled by the drain purifying apparatus of the present invention is used, the piping to be used becomes short and efficient.

In the above-described embodiment, the heat exchanger is installed in the drain purifying apparatus. Conversely, the heat exchanger is separately provided outside, the drain liquid is introduced into the heat exchanger and heated, and then supplied to the drain purifying apparatus. It is also possible.

Further, as another drain heating means, factory steam may be used, and its schematic configuration and functions are the same as those shown in FIGS. 4, 5 and 6.

[0029]

As described above, according to the present invention, by heating the drain, the electric conductivity is increased, the current can easily flow between the electrodes, and the drain oil / water separation function can be improved. A purifying device can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a drain purifying apparatus that heats a drain in an electrolytic separation tank by an electric heater according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a drain purifying apparatus that heats a drain in a sub-tank with an electric heater according to an embodiment of the present invention.

FIG. 3 is a schematic view of a drain purifying apparatus according to an embodiment of the present invention that heats a drain in a pipe section with an electric heater.

FIG. 4 is a schematic view of a drain purifying apparatus for heating a drain in an electrolytic separation tank with an air compressor and high-temperature discharge air according to another embodiment of the present invention.

FIG. 5 is a schematic view of a drain purifying apparatus that heats a drain in a sub-tank with an air compressor and high-temperature discharge air according to another embodiment of the present invention.

FIG. 6 is a schematic view of a drain purifying apparatus according to another embodiment of the present invention, which heats a drain in a pipe portion with an air compressor and high-temperature discharge air.

FIG. 7 is a schematic view showing a conventional drain purification device.

[Description of Signs] 1a, 1b: Electrode 2: Drain 2a: Oil 2b: Suspended substance 2c: Water 3 ... Electrolyzer 4 ... Sub-tank 5: Drain supply phon 6, 12, 12: Pipe 14, 17, 19 ... Electric heater 15, 18, 20, 22, 25, 28: Controller 16: Temperature detector 21, 24: Heat exchanger for high-temperature discharge air 23, 26, 29 ... Control valve 27: Heat exchanger for high-temperature discharge air with double piping structure

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenkichi Takahashi 1007 Kamigo, Ebina-shi, Kanagawa Prefecture Inside the Ebina Works of Hitachi Techno Engineering Co., Ltd. (72) Inventor Masato Itagaki 5-2-2 Koyodai, Ryugasaki-shi, Ibaraki (72) Inventor Kenichi Takahashi 5-2 Koyodai, Ryugasaki-shi, Ibaraki F-term (reference) 4D037 AA11 AA12 AB06 BA01 BA07 BB01 BB02 BB06 CA02 CA04 CA06 4D061 DA08 DB15 DC01 EA08 EB01 EB04 EB14 EB16 EB17 EB20 EB37 EB39 ED20 FA01 FA13 GA06 GA09 GC05

Claims (4)

[Claims] 1. A drain purifying apparatus comprising: an electrolytic separation tank having at least one pair of electrodes therein for separating oil-water turbid drains from oil and water; a sub-tank storing the drains; A drain purifying device comprising means for heating at least one of the drain liquid in the electrolytic separation tank, the sub-tank, or the pipe from the sub-tank to the electrolytic separation tank. 2. The drain purifying apparatus according to claim 1, wherein the heating means for heating the drain liquid is an electric heater, high-temperature discharge air from an air compressor, or factory steam. 3. The drain purifying device according to claim 2, wherein the high-temperature discharge air is high-temperature discharge air of an air compressor that discharges the drain liquid. 4. The drain purifying apparatus according to claim 1, wherein a temperature detecting means is provided in the electrolytic separation tank to detect a temperature of the drain liquid and adjust the heating means to a predetermined temperature. A drain purifying device comprising a means.