JPH0347881B2 - - Google Patents

Description

[Detailed description of the invention]

(Object of the invention) The present invention relates to a sedimentation separation means by leaving water and solid impurities still when refining and regenerating waste oil such as cutting oil in metal processing and lubricating oil for various machines, and improves sedimentation separation efficiency. In addition to promoting
The purpose is to facilitate refining operations such as filtration following sedimentation separation, and to improve the economic efficiency of waste oil regeneration. In the waste oil regeneration work as described above, sedimentation separation work is initially performed in order to ensure the economic efficiency of refining. In this sedimentation separation, waste oil is stored in a settling tank and processed in order to separate impurities such as water, metal scraps, and scraps of textiles such as work gloves and rags from the oil based on the difference in specific gravity. The gentle convection caused by the temperature promotes sedimentation and separation, and the precipitated moisture and impurities are removed from the bottom of the tank in a timely manner. Such sedimentation separation treatment requires a considerable amount of time, and if this treatment is rushed, the purity of the oil after treatment will be reduced. If the purity of the oil after treatment is low, it will be difficult to carry out the subsequent filtration work.
Alternatively, a large amount of auxiliary materials such as adsorption aids are consumed, the yield of refined oil is reduced, or a large filtration device is required, which significantly reduces the economic efficiency of waste oil regeneration work. Accordingly, the present invention provides a means for increasing the efficiency of the sedimentation separation treatment of incoming waste oil, i.e., by shortening the treatment time and ensuring good purity of the treated oil, thus reducing the need for subsequent filtration, etc. The purpose is to facilitate refining operations and ultimately improve the economic efficiency of waste oil recycling. (Structure of the Invention) The sedimentation separator for waste oil regeneration according to the present invention includes:
The bottom end of the settling tank 1 is connected to a closed collector bowl 2, and the top of the collector bowl 2 is connected to the body of the settling tank 1 via a bypass pipe 3. However, the settling tank 1 is a tank used to receive a supply of waste oil, leave it stationary, and settle solid impurities contained therein. The structure of the present invention is as described above, but for ease of understanding, the present invention will first be explained with reference to FIG. 1 showing one implementation. It is used to leave waste oil supplied by suitable means to settle out impurities such as water and solids contained therein. Although not shown in the drawings, this settling tank 1 typically uses a heat coil, an electric heater, etc. to heat the contained waste oil to reduce its viscosity. The bottom end of the settling tank 1 is connected to a closed collector bowl 2, while the top of the collector bowl 2 is connected to the body of the settling tank 1 via a bypass pipe 3. In particular, according to this embodiment, the collector bowl 2 is provided with a water level sensor 4 that operates by detecting a constant water level inside, and the drain pipe 21 is fitted with an electromagnetic valve 5 that responds to the water level sensor. The manual on-off valves V ₁ and V ₂ in the illustrated embodiment are for opening and closing the discharge port of the drain pipe 6. In addition, settling tank 1 and collector bowl 2
Manual on-off valve V ₃ and bypass pipe 3 at the connection with
The manual on-off valve _V4 is for separating the liquid in the settling tank 1 from the collector bowl 2 when necessary, as will be described later. The manual on-off valve _V5 is an air supply valve used when the collector bowl 2 is emptied while the settling tank 1 still contains the waste oil concentrate. Further, it is preferable to provide suitable manholes in the walls of the settling tank 1 and the collector bowl 2 for inspection and repair work inside them.
Of course, when the illustrated apparatus is installed on the ground, it goes without saying that it needs to be supported by a suitable pedestal (not shown). To explain how to use the apparatus of the above embodiment, first, a waste oil stock solution, which is the object of sedimentation separation, is injected into the settling tank 1 and stored therein. During injection,
It is better to keep the manual on-off valves V ₃ and V ₄ fully closed, and then gradually fully open these manual on-off valves V ₃ and V ₄ at the end of injection. After a while after injection, the agitation of the waste oil stock solution subsides, and contaminants such as water, metal powder, and fiber waste begin to settle.At the same time, the water level in the collector bowl 2 rises, and the water-containing fiber waste begins to settle. Solids with high specific gravity, such as metal powder and metal powder, settle at the bottom of the collector bowl 2. During this time, fine solid matter and water particles that have not settled sufficiently and are dispersed in the oil are present in the upper layer of the liquid in the collector bowl 2, and the oil containing these fine particles is moved through the bypass pipe by natural convection. 3 and returned to settling tank 1.
The returned particles adhere to each other in the settling tank 1 and are easily separated from the oil and settle, and then descend from the bottom of the settling tank 1 to the collector bowl 2 again and settle. When the water level in the collector bowl 2 rises to a certain level in this way, the water level sensor 4 detects this, and the detection signal opens the solenoid valve 5, so that water and other sediments in the collector bowl 2 are discharged. Ru. The opening period of the electromagnetic valve 5 is determined by a timer attached to the water level sensor 4, or by the water level sensor 4, which generates a closing signal for the electromagnetic valve 5 according to an appropriate change in the water level.
This can be optimally controlled by selecting . In this way, when the waste discharged from the drain pipe 21 via the solenoid valve 5 is visually inspected and water and impurities are found to be minimal and significant oil has been mixed in, the treatment operation is completed and subsequent purification such as filtration is performed. Transfer to process. The treatment results of sedimentation separation using the example shown in FIG. 1 will be listed below in comparison with the treatment results of the conventional apparatus example. The dimensions and volume of the apparatus of the embodiment are as follows, and the example of the conventional apparatus is a settling tank 1 obtained by removing the collector bowl 2 and bypass pipe 3 from the apparatus of the embodiment. Settling tank 1 Inner diameter D = 900mm Height H = 1110mm Volume = 401 Collector bowl 2 Inner diameter d = 450mm Height h = 550mm Volume = 87 Bypass pipe 3 Inner diameter = 27.6mm Head K = 450mm Table 1 shows the implementation described above. Conditions in a processing example using an example device and a conventional example device are shown. However, both Treatment Example 1 and Treatment Example 2 are related to the above-mentioned example device, and the control example is related to the conventional example device, and the waste oil stock solution to be treated is mainly waste oil from rolling gear oil (Ciel Orama #220). Contaminants were found to be water, metal powder, and textile debris.

[Table] Table 2 shows the results of the above treatment. However, the test targeted the treated liquid, which is the residual liquid in the settling tank 1 at the end of the treatment.

[Table] From the above results, it can be seen that with the apparatus of the present invention, the amount of solid matter and water remaining in the waste oil after static separation treatment is considerably smaller than that with the conventional apparatus. It can be seen that the time required for processing is short. In the device of the embodiment, the discharge of moisture and other precipitates is automatically and efficiently carried out by the solenoid valve 5 that responds to the water level sensor 4, whereas in the use of the conventional example, the discharge of moisture and other precipitates is performed manually by operating the on-off valve _V3 . is carried out manually, and since the water separation is not good, the number of valve operations per unit time is reduced. This is because it takes a long time to perform the operation. The results of waste oil treatment according to the above embodiments have been described above. Although the combination of the water level sensor 4 in the collector bowl 2 and the discharge solenoid valve 5 is useful for improving the efficiency of discharging sediment, , it does not help promote the separation and sedimentation of impurities. By the way, this invention is made as described above,
In order to examine the effect of the bypass pipe 3 connecting the body of the settling tank 1 at the top of the collector bowl 2 on the promotion of separation and sedimentation, the following tabletop test was conducted. It goes without saying that if the separation of water and impurities from the oil is significantly promoted, the properties of the recycled oil will be improved, and this will ultimately have a favorable effect on shortening the waste oil treatment time. One of the devices used in the test was a small device made of transparent plastic (FIG. 2), and had a structure corresponding to the device of the embodiment described above. The other device has a structure corresponding to the conventional device described above, and is also a small device made of transparent plastic (FIG. 3). The capacity of the settling tank 1 is 5, and the capacity of the collector bowl 2 is 1. However, the collector bowl 2 is not provided with a water level sensor. There are four types of waste oil to be treated: 90 cst cutting oil containing stainless steel powder (cutting oil type 2 No. 17) Similar cutting oil containing copper powder 40 cst cutting oil containing stainless steel powder (cutting oil type 2 No. 16) Similar cutting oil containing copper powder Cutting oil However, all of the above waste oils contained water and fiber waste, which was thought to be the material of rags, work gloves, etc., and most of the metal powder passed through a 50-mesh sieve. The device of the present invention (second
Tables 3 to 6 show the results of sedimentation separation using the conventional apparatus (Fig. 3) and the conventional apparatus (Fig. 3). However, the test method is as follows. (1) For the sample, the same waste oil stock solution obtained was thoroughly stirred, and the sample was placed in the device of the present invention and the conventional device at 40°C.
I prepared it one by one. (2) The standing time is 24 hours, during which time valves v ₁ and v ₅ are closed and valves v ₃ and v ₄ are fully opened in the device of the present invention. (3) The temperature of the sample during the standing time is
Store at 20℃ and samples at 40℃. (4) After the standing time has elapsed, the discharged material is extracted from valve v ₁ in the device of the present invention, and from valve v ₃ in the conventional device, and is removed when it is recognized that the discharged material contains significant oil. end. (5) The discharged material is filtered through 10 μ filter paper, the filter cake is heated and dried, deoiled with volatile oil, dried and weighed, and further weighed after cauterization, and this weighed amount is taken as the weight of the metal powder.
The loss due to cauterization is the weight of the fibers.

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[Table] Furthermore, in order to confirm what kind of effect the sedimentation separation process using this invention apparatus has on removing water in oil, the following tabletop test was conducted. The test method is as follows. (1) Take the above-mentioned sample containing metal powder, etc. as a sample, add acid clay to each sample, stir and filtrate to remove water and solids almost completely, and add 6% tap water to each sample.
Add the water and stir vigorously to thoroughly disperse the water, and use these as the sample and sample, respectively. (2) First, four samples each were placed in the apparatus of the present invention (FIG. 2) and the conventional apparatus (FIG. 3) for the above-mentioned tabletop test, and were left standing at 20° C. for 24 hours. Valves v ₁ , v ₃ , v ₄ during standing time,
v Opening and closing of ₅ is in accordance with the tabletop test for the sample described above. (3) At the end of the standing time, the device of the present invention closes the valve.
In the conventional device, valves V ₁ and V ₃ are opened, and the precipitated water is received into the graduated cylinder along with some oil.
After allowing it to stand for 24 hours, weigh the aqueous layer. (4) Next, the sample is treated in the same manner as in (2) and (3) above. However, the temperature of the sample inside the device is
Hold at 40°C. Table 7 shows the oil/water separation results from the above tabletop test.

[Table] That is, the above test confirmed that the presence of the bypass pipe 3 had a significant effect on the separation and sedimentation of water and impurities from oil. (Effects of the Invention) As is clear from the test results listed above, the device of the present invention is effective when the viscosity of the waste oil to be treated is relatively high.
Regardless of whether the temperature is low, whether the treatment is performed near room temperature, or the treatment is heated, the separation and sedimentation performance of water and impurities from oil is significantly higher than that of conventional equipment. That is, according to the present invention, since the sedimentation separation of water and impurities from the waste oil stock solution is performed with high efficiency, the adsorption aid in the filtration process necessary for waste oil regeneration following the static separation treatment is In addition to significantly reducing the consumption of oil, it also has the effect of reducing the energy required by downsizing filtration equipment and other equipment, shortening refining time, etc., and significantly contributes to reducing the cost of waste oil recycling processing.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of one embodiment of the present invention;
The figure is a longitudinal skeletal diagram of the device of the present invention in a tabletop test.
FIG. 3 is a longitudinal sectional view of the conventional device corresponding to FIG. 2. 1 is a settling tank, 2 is a collector bowl, 3 is a bypass pipe, 4 is a water level sensor, 5 is a solenoid valve, 6 is a drain pipe, V ₁ , V ₂ , V ₃ , V ₄ , V ₅ ,
v ₁ , v ₃ , v ₄ , and v ₅ are manual on-off valves.

Claims (1)

[Claims] 1. The bottom end of the settling tank 1, which receives waste oil and allows it to settle and settles the water and solid impurities contained therein, is connected to a closed collector bowl 2, and is also Place the top of the collector bowl 2 into the settling tank 1.
Sedimentation separator for waste oil regeneration connected to the body of.