JPH06145671A - Flocculator for particle in heavy oil - Google Patents

Abstract

PURPOSE:To obtain the subject flocculator, equipped with an oil tank, a rotatable electrode and a scraper for scraping off deposits sticking to the electrode, capable of reducing the frequency of oil purification and improving the particle removal efficiency and enabling the continuous operation. CONSTITUTION:This flocculator is equipped with plural sets of rotatable negative electrodes 1 and high-voltage positive electrodes 2 forming one set in an oil tank and a scraper 3 subjected to processing with Teflon(R) for scraping deposits sticking to the electrode and used to introduce a heavy oil from an inlet 5 of the oil tank. A voltage is then applied to the electrodes 1 and 2 in their states in which halves are dipped therein while rotating the electrode 1 5-30 times per min to completely prevent flocculates from sticking and depositing on the electrode without requiring the stop of the operation of the device for replacing the electrodes. Particles in the raw material oil can be removed at a high particle removal ratio and the heavy oil can be electrostatically purified in a manner extremely useful for recycling treatment of waste all, etc.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a particle aggregating apparatus and a cycle type electrostatic oil purification system using the same.

[0002]

2. Description of the Related Art Particles due to various causes are present in heavy oil such as petroleum, which is not preferable when used as a filter raw material, a resin raw material or a carbon fiber raw material. It is well known to bring results. In particular, the fluid catalytic cracking residual oil contains the catalyst of the fluid catalytic cracking unit. Most of the particles thus dispersed in the heavy oil are positively or negatively charged. When an electric field acts on these, positively charged particles move in the direction of the electric field, and negatively charged particles move in the opposite direction. In addition, particles that are not charged are subjected to an electric field gradient force between individual particles to cause the particles to aggregate and grow, or to be attracted to the electrodes. The electrostatic oil purification method is based on this principle. In the electrostatic oil purification method, the solid matter in the oil is made to adhere to each other by the electric field to increase the size, and the agglomeration process to remove the agglomerated particles by centrifugation, and the fine particles that cannot be removed by this are attached to the electrode plate by a higher voltage. It consists of a refining process that purifies oil. EC (Electric Charge)
r), the centrifuge is a CS (Centrifugal Separator),
EDC (Electrostatic Dust Collecto)
r) and adopt the flow shown in Figure 1. And, for example, the fluid catalytic cracking residual oil before being subjected to this flow contains about 1000 ppm of catalyst particles of several μm, and when it is processed once by this flow (referred to as one pass of oil purification), it is about 20 to 50 ppm. Although it can be lowered to a level, it is the current situation that this flow must be applied 3 times (3 passes of oil purification) in order to achieve 5 ppm or less. Further, the aggregating device (EC) is for inserting an electrode into the treated oil to cause particles in the oil to aggregate and grow. However, if the particles in the aggregating device are referred to, sludge is accumulated. It was found that the electrode was lowered and the particle removal efficiency was lowered. This phenomenon makes continuous operation impossible and is a big problem.

[0003]

[Purpose] A first object of the present invention is to prevent particles from accumulating on the electrodes of the aggregating device, a second object thereof is to reduce the number of oil purifications as much as possible, and a third object.
The purpose of is to improve the particle removal efficiency and enable continuous operation by achieving the first and second objects.

[0004]

A first aspect of the present invention relates to an apparatus (EC) for aggregating particles in heavy oil, comprising an oil tank, a rotatable electrode, and a scraper for scraping off deposits attached to the electrode. . A second aspect of the present invention is a novel feedstock supply device, a cycle oil feed device, a device for selectively transferring the new feedstock and / or cycle oil from the two feed devices to a particle agglomerator, 1. A cycle comprising a particle aggregator (EC), a centrifugal separator (CS), an electrostatic oil purifier (EDC) according to 1, and a transfer device for selectively returning to a cycle oil supply device and collecting processed oil. Type electrostatic oil purification system. A third aspect of the present invention is a feedstock oil supply device, a first centrifugal separator, a particle agglomerator according to claim 1, a second centrifugal separator, a first electrostatic oil purifier, and a second electrostatic separator.
The present invention relates to a one-pass type electrostatic oil purification system including an electrostatic oil purification device. In these systems, it is preferable to provide a heating device before either or both of the particle aggregating device and the electrostatic oil purifying device. As a result, if the viscosity of the oil is lowered by heating the temperature of the treated oil to 80 to 130 ° C., the particle removal efficiency is further improved.

It is advantageous to set a plurality of rotatable electrodes in the oil tank, and in particular, a plurality of rotatable negative voltage (ground electrode) and a fixed high voltage positive electrode are set. Is advantageous. In addition, it is advantageous to set a negative electrode group that is rotatable on one rotation shaft for the plurality of electrode groups. In order to rotate, the shape of the electrode is generally a disk. As the electrode, stainless steel, copper or other conductive material can be used. The object can be sufficiently achieved by rotating the electrode 5 to 30 times per minute, usually 5 to 20 times. The scraper is not particularly limited in material as long as it can scrape off particles deposited on the electrode, but it is preferable to use a material surface-treated with Teflon, silicone or the like. A common material is stainless steel.

[0006]

【Example】

Example 1 (corresponding to claims 1 and 2) (1) Operating conditions and specifications Oil passage amount 150 liters / hour Processing temperature 120 ° C to 150 ° C (viscosity 5.5c
st) EC applied voltage 8,000V CS rotation speed 9000rpm CS centrifugal force 8,400G EDC applied voltage 11,000V (Note) EC: Particle concentrator in oil CS: Centrifugal separator EDC: Electrostatic purifier (2) ) System used: As shown in FIG. 1 (3) Device for aggregating particles in heavy oil Six stainless steel plates having a diameter of 400 mm and an electrode surface area of 8000 cm ² are set as shown in FIGS. It was rotated once every 3 minutes by one rotating shaft. The relationship between the rotating negative electrode 1, the fixed positive electrode 2 and the scraper 3 is shown in FIGS. The scraper used was made of stainless steel and treated with Teflon. In this apparatus, half of the electrodes were immersed in oil filled in an oil tank having a volume of 50 liters.

Comparative Example 1 For comparison, an oil purification treatment was carried out under the same conditions as in Example 1 except that a particle-in-oil aggregating device using a fixed electrode was used instead of the rotary electrode as in the example. went.

The efficiency of removing particles from oil in Example 1 and Comparative Example 1 is as follows.

[Table 1]

Example 2 (corresponding to claims 1 and 3) (1) Operating conditions: the same as in Example 1 (2) System used: as shown in FIG. 6 (3) Particle-in-oil agglomerator: Same as Example 1 (4) Result Ash content of 1 ppm or less can be achieved in one pass. No reduction in removal efficiency was observed even after 50 hours of continuous operation.

[0010]

【effect】

(1) Since the apparatus for aggregating particles in heavy oil of the present invention is provided with a rotating electrode and a scraper, it is possible to completely prevent the electrode from adhering to and depositing on the agglomerates, and at the same time, by rotating the electrode. Since the oil in the aggregating device is agitated, the agglomerates having an increased particle size do not settle in the device and can be smoothly transferred to the centrifugal separator. (2) Since the agglomerates do not deposit on the electrodes, it is not necessary to stop the operation of the apparatus in order to remove them or replace the electrodes. (3) Moreover, if the system of claim 3 is adopted, a high particle removal rate can be achieved in one pass. (4) The present invention is extremely useful for removing particles in a raw material oil such as carbon fiber and petroleum resin and for reclaiming waste oil.

[Brief description of drawings]

FIG. 1 is a flow sheet showing an example of a cycle type electrostatic oil purification system.

FIG. 2 is a perspective view showing an example of a particle aggregating apparatus of the present invention.

FIG. 3 is a cross-sectional view of the particle aggregating apparatus of the present invention cut in front of a rotating electrode.

FIG. 4 is a cross-sectional view of the particle aggregating apparatus of the present invention taken in front of a fixed high-voltage electrode.

FIG. 5 is a partial cross-sectional view showing the relationship between the positive and negative electrodes of the present invention.

FIG. 6 is a flow sheet showing an example of a one-pass type electrostatic oil purification system.

[Explanation of symbols]

 1 Rotatable negative electrode (ground electrode) 2 Fixed positive electrode (high voltage electrode) 3 Scraper 4 Insulator (insulator) 5 Inlet 6 Drain 7 Rotating shaft

 ─────────────────────────────────────────────────── --Continued front page (72) Inventor Yoshio Suzuki 3-5 Kasumigaseki, Chiyoda-ku, Tokyo Showa Shell Sekiyu KK

Claims (4)

[Claims] 1. An apparatus for aggregating particles in heavy oil, comprising an oil tank, a rotatable electrode, and a scraper for scraping off deposits attached to the electrode. 2. A fresh feed oil supply device, a cycle oil feed device, and a device for selectively transferring the fresh feed oil and / or cycle oil from the two feed devices to a particle agglomerator. Cycle type electrostatic oil purification system consisting of a particle agglomeration device, a centrifugal separator, an electrostatic oil purification device, and a transfer device for selectively returning to the cycle oil supply device and collecting the processed oil. 3. A one-pass comprising a feed oil supply device, a first centrifugal separation device, a particle aggregating device according to claim 1, a second centrifugal separation device, a first electrostatic oil purification device, and a second electrostatic oil purification device. Type electrostatic oil purification system. 4. A heating device is provided in front of either or both of the particle aggregating device and the electrostatic oil purification device.
Or the electrostatic oil purification system described in 3.