WO2008032604A1

WO2008032604A1 - Method and apparatus for purifying fuel oil

Info

Publication number: WO2008032604A1
Application number: PCT/JP2007/067202
Authority: WO
Inventors: Masahito Inoue; Kouichi Inoue
Original assignee: Zeotek Research Institute Ltd.
Priority date: 2006-09-12
Filing date: 2007-09-04
Publication date: 2008-03-20
Also published as: JPWO2008032604A1; JP3163830U

Abstract

[PROBLEMS] To provide a method and apparatus for purifying a fuel oil in which maintenance work is facilitated and purification effect can be enhanced significantly by capturing impurity particles in the fuel oil. [MEANS FOR SOLVING PROBLEMS] A plate rotary electrode (21) is provided in a container earth electrode (20), and a voltage application means (3) is provided for applying a DC voltage between the electrodes (20, 21) in order to make impurity particles in a circulatihg fuel oil cohere and coarsen by making the Zeta-potential of the impurity particles lower or disappear and to charge the impurity particles with a potential reverse to that of the plate rotary electrode (21) so that they are attracted to the opposite side faces (21a) thereof by Coulomb force. Furthermore, a scraper (22) for scraping and collecting the impurity particles attracted to the opposite side faces (21a) of the plate rotary electrode (21) is provided. A fuel oil processed by a purifier (1) is purified to such an extent that the residual carbon is 8-9 wt% or less and the impurity particle diameter is 5-10 μm or less.

Description

Specification

Method and apparatus for purifying fuel oil

Technical field

[0001] The present invention relates to a purification method and a purification device for removing impurities from fuel oil used as fuel for large ships, power generation engines, and the like.

Regarding the method.

Background art

[0002] In an engine using this type of fuel oil, for example, a diesel engine of C heavy oil specification, impurities such as silica and catalyst residues in the fuel oil (C heavy oil) are generally removed and cleaned as a high-speed centrifuge. Is used. For example, in Patent Document 1, low-quality heavy oil such as heavy oil c is treated with a high-speed centrifuge to centrifuge impurities, the inside of the centrifuge is washed with heavy oil A, and the centrifuged sludge is taken out. Water is evaporated and removed from the sludge containing C heavy oil and A heavy oil, and solids are separated and removed by centrifuging with a low-speed centrifuge, and the remaining mixture of C heavy oil and A heavy oil is removed from the engine. A method for removing impurities from a fuel oil characterized by being used as a fuel is proposed!

[0003] However, the maintenance work of the centrifuge accounts for a large proportion of the maintenance time related to the engine, and the maintenance work of the centrifuge device is desired to be reduced in relation to the onshore power generation including ships. In addition, the properties of fuel oil are becoming increasingly worse, increasing the degree of pollution of system oil and causing engine damage, so further improvement in purification capacity is required.

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2004-155809

Disclosure of the invention

Problems to be solved by the invention

[0005] In view of the above situation, the present invention intends to solve the problem that the maintenance work is easy, and it is possible to capture the impurity particles in the fuel oil and remarkably improve the purification effect. The point is to provide a purification device.

Means for solving the problem [0006] In order to solve the above-mentioned problems, the present invention has an impurity particle in the fuel oil by applying a DC voltage of 300 to 1000 V per interval of 20 mm between the electrodes through which the fuel oil flows. In addition to lowering or eliminating the zeta potential, the coagulated coarse particles are made to adsorb on the electrode by Coulomb force, and a recovery means for collecting the adsorbed impurity particles is provided, so that the residual carbon content is 8 to 9% by weight or less. And a method for purifying a fuel oil, wherein the impurity particle size is purified to 5 to 10 m or less.

[0007] Here, a flat plate rotating electrode is provided in a container ground electrode filled with fuel oil, and a voltage is applied between the electrodes to lower the zeta potential of impurity particles in the flowing fuel oil. Alternatively, it disappears and agglomerates and coarsens, and is charged to a potential opposite to the potential of the flat plate rotating electrode and adsorbed on both sides of the flat plate rotating electrode by Coulomb force. It is preferable to provide a scraper portion for recovery.

[0008] The present invention is a purifying apparatus used in the fuel oil purifying method described above, wherein a plate rotating electrode is provided in a container ground electrode filled with fuel oil, and a voltage is applied between the electrodes. In addition, the zeta potential of the impurity particles in the flowing fuel oil is reduced or eliminated to cause agglomeration and coarsening, and the plate is rotated by a clone force by charging it to a potential opposite to that of the plate rotating electrode. A fuel oil purifying apparatus is provided, which is provided with voltage applying means for adsorbing on both side surfaces of the electrode and a scraper section for collecting adsorbed impurity particles by scraping.

Specifically, it is preferable that a plurality of flat plate rotating electrodes be arranged in parallel. Further, it is preferable to provide a heating means for heating the fuel oil supplied between the electrodes to 100 to 140 ° C in advance. The discharged processing solution is further filtered using a charge aggregation filtration device.

The invention's effect

[0010] The present invention as described above is provided with a recovery means for recovering the impurity particles adsorbed on the electrodes by applying a DC voltage of 300 to 1000V per 20mm interval between the electrodes through which the fuel oil flows. Impurities can be efficiently removed without requiring a complicated structure, durability is high, maintenance is almost unnecessary, residual carbon content is 8 to 9% by weight and less. Pure particles can be purified to 5 to 10 m or less to prevent engine damage.

[0011] Further, a flat plate rotating electrode is provided in a container ground electrode filled with fuel oil, and a voltage is applied between the electrodes to agglomerate and coarsen impurity particles and adsorb on both side surfaces of the flat plate rotating electrode. As a means for collecting the impurity particles, a scraper part that collects the particles by scraping is provided, so that the impurity particles can be efficiently recovered and removed by the rotating electrode.

[0012] Further, since the plurality of flat plate rotating electrodes are arranged in parallel, the adsorption area is remarkably increased by increasing the number of rotating electrodes, and the impurity fine particles can be recovered and removed more efficiently.

[0013] Further, since the heating means for heating the fuel oil to 100 to 140 ° C is provided in advance, the flow of the fuel oil is improved, and the aggregation and coarsening of impurities and the charge adhesion are promoted, and the efficiency is improved. It can well collect and remove impurity particles.

[0014] In addition, since the discharged processing liquid is filtered using a charge aggregation filtration device, the impurity particles that are agglomerated and coarsened by the voltage between the electrodes are reliably captured by the charge aggregation filtration device, and the purification effect is improved. It can be significantly improved.

Brief Description of Drawings

FIG. 1 is an explanatory diagram showing a purification device according to a representative embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a system configuration diagram of the purification device.

[Fig. 4] A graph of the results of a test of agglomeration coarsening and adsorption removal of impurity particles using a rotary electrode type adsorption removal apparatus.

Explanation of symbols

[0016] 1 Purification device

2 Rotating electrode adsorption removal device

3 Voltage application means

4 Heating means

5 Charged coagulation filtration device

6 Strainer

10 Storage tank

20 Container ground electrode 21 Plate rotating electrode

21a Both sides

22 Scleno

23 Impurity recovery tank

24 processing tank

25 Rotation axis

26 Drive motor

40 Heating tank

41 Heater

PI, P2, P3 pump

BEST MODE FOR CARRYING OUT THE INVENTION

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram showing a configuration of a purification apparatus according to the present invention, in which FIGS .;! To 3 show typical embodiments, in which 1 is a purification apparatus, 2 is a rotary electrode type adsorption removal apparatus , 3 is a voltage applying means, 4 is a heating means, and 5 is a charge aggregation filtration device.

In the following embodiment, an example in which a plate rotating electrode is used as an electrode will be described. However, the present invention is not limited to this, and is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-354 789 by the present applicant. A drum-type electrode is also a preferred embodiment.

As shown in FIGS. 1 and 2, the purification apparatus 1 is provided with a plate rotating electrode 21,... In a container ground electrode 20 filled with fuel oil, and a DC voltage is applied between the electrodes 20, 21. By applying the voltage, the zeta potential of the impurity particles in the flowing fuel oil is reduced or eliminated to cause agglomeration and coarsening, and at the same time, it is charged to a potential opposite to the potential of the flat plate rotating electrode 21 to obtain a clone. A voltage applying means 3 for adsorbing to both side surfaces 21a of the plate rotating electrode 21 by force is provided.

[0021] Further, a scraper 22 is provided for collecting the impurity particles adsorbed on the both side surfaces 21a of the flat plate rotating electrode 21 by scraping them. The force S is used to purify to 8 to 9% by weight or less and the impurity particle size is 5 to 10 inches or less. More specifically, heating means 4 for heating the fuel oil supplied between the electrodes 20 and 21 to 100 to 140 ° C. in advance is provided. This preheating improves the flow of the fuel oil to be processed, and facilitates aggregation and coarsening of impurities and charge adhesion.

Further, the treatment liquid discharged without adhering to the flat plate rotating electrode 21 is further filtered using the charge aggregation filtration device 5.

Hereinafter, the structure of each part will be described in more detail.

[0025] The purification device 1 according to the present embodiment includes a rotating electrode type adsorption / removal device 2 in which a plurality of the plate rotating electrodes 21 are arranged in parallel, and a heating unit that preheats the fuel oil supplied to the device 2. 4. A heating tank 40 and a heater 41 as 4 and a plurality of charged flocculation filtration devices 5,... For further filtering the fuel oil discharged from the device 2, and a system configuration of the charged flocculation filtration device 5 The processing liquid discharged from the tank is returned to the storage tank 10 for supplying fuel oil to the heating means 4.

[0026] In this example, it is not always necessary to configure the circulation filtration system in this way and to use a force S that circulates for a predetermined time and repeats filtration, and a circulation type. In this example, as shown in FIG. 3, a strainer 6 for removing relatively large impurities is provided in the middle of the flow path before supplying the fuel oil to the heating means 4.

[0027] As shown in Figs. 2 and 3, the heating means 4 includes a heating tank 40 that stores and distributes the liquid to be treated (fuel oil) supplied from the storage tank 10 by the pump P1, and the stored fuel. It comprises a heater 41 for overheating the oil, and the temperature-controlled steam flows through the heater 41.

The rotary electrode type adsorption / removal device 2 includes a plurality of disk-shaped flat plate rotating electrodes 21,... Having the same diameter inside a box-shaped container ground electrode 20 to which a liquid to be treated is supplied via a heating unit 4. Are arranged coaxially in parallel on the rotating shaft 25, and each rotating electrode 21 is rotated in the same direction by a drive motor 26 that rotates the rotating shaft 25.

[0029] The voltage applying means 3 is connected to each flat plate rotating electrode 21 via the rotating shaft 25, and 300 to 1000 V per interval of 20 mm between the same and the connected container ground electrode 20; more preferably Apply a DC voltage of 300-800V. Here, it is preferable that the load voltage can be adjusted by a slidac and the amount of adsorbed fine particles and residual carbon content are controlled. Each flat plate Both sides of the rotating electrode 21 are preferably coated with a substance having a high dielectric constant. The connection polarity by the voltage applying means 3 can be reversed.

[0030] On each side surface 21a of the flat plate rotating electrode 21, a substantially L-shaped scraper piece in a sectional view is disposed close to the outer peripheral edge portion obliquely downward from the center portion, and the scraper pieces on both side surfaces are disposed at the outer peripheral portion. A scraper 22 that extends integrally in a substantially U-shaped section is formed! The scraper 22 is provided on each flat plate rotating electrode 21 and extends to an impurity recovery tank 23 provided on the side of the container ground electrode 20, and the impurity particles adsorbed on each side surface 21a are scraped off by a scraper piece, Pour into collection tank 23 and collect.

[0031] On the side opposite to the recovery tank 23, a processing tank 24 is provided in which the processing liquid overflowed by passing between the plate rotating electrodes 21 in the container ground electrode 20 is temporarily stored. , And supplied to the charge aggregation filtration device 5 by the pump P3.

[0032] The charged flocculation filtration device 5 is a device that utilizes the physical filtration action by the filter mesh and the flocculation coarsening phenomenon due to the decrease in zeta potential of the impurity particles in the fuel oil. This is a charged filter device, and the technology disclosed in Utility Model Registration No. 2036263 and Japanese Patent Publication No. 08-210 by the present applicant can be used, especially to promote the filtration of impurities such as solid particles in the liquid to be treated. . Three of these charged coagulation filtration devices 5 are installed in parallel, and the processed fuel oil is returned to the storage tank 10 again.

[0033] The treatment liquid treated by the rotary electrode type adsorption / removal device 2 has the impurity particles, and the aggregate potential is reduced by reducing or eliminating the zeta potential. Therefore, instead of using the charged collection filtration device 5, a normal filtration device that is not charged may be provided. Further, the charged aggregation filtration device 5 is not limited to the above. Also, don't do these filtrations at all! /, Or you can use a variety of filtration devices to process them in series! /.

[0034] While the embodiments of the present invention have been described above, the present invention is not limited to these examples, and can of course be implemented in various forms without departing from the spirit of the present invention.

Example

[0035] Next, the purification apparatus 1 of the representative embodiment shown in the above figures;! To 3 (however, the circulating liquid is not circulated, and the processing liquid that has passed through the charged aggregation filtration apparatus is recovered in a recovery tank.) Used This section describes the test results of measuring the residual carbon content and FCC catalyst particle concentration when treating only FCC heavy oil.

[0036] In the test, each part (in the storage tank, in Example 1 in which spent FCC heavy oil was placed in the storage tank of the purification apparatus 1 and heated to 50 ° C by heating means and in Example 2 heated to 100 ° C. The silica concentration, alumina concentration, and residual carbon concentration of FCC heavy oil in the flat plate rotating electrode, in the treatment tank, and in the recovery tank) were measured. The test was performed by applying a DC voltage of 500 V / 20 mm between the electrodes of the rotating electrode type adsorption removal device, and applying an AC voltage of 250 V per 10 mm interval between the electrodes in the charge aggregation filtration device.

[0037] [Table 1]

[0038] From Table 1, comparing Example 1 and Example 2, Example 2 where the temperature is higher is higher in the concentration of silica and alumina in the processing tank where the concentration of silica and alumina collected near the electrode is higher. It can be seen that the processing capacity is improved. In both Examples 1 and 2, the silica concentration decreased to 5.8 ppm force, 1.4 ppm, and the anolemina also decreased from 3.5 ppm to 0.6 ppm, so that the impurity particles were reliably trapped. , You can see that purification is taking place. Furthermore, the residual carbon concentration has been successfully reduced from 9.8% to 7%.

[0039] Next, test results for demonstrating the effects of agglomeration and coarsening of impurity particles and adsorption removal by a rotating electrode type adsorption removal apparatus will be described.

[0040] In the test, the charged coagulation filtration device is omitted from the devices shown in the above figures;! To 3, and the used FCC heavy oil is treated using the rotating electrode type adsorption removal device 2. Electrode of rotary electrode type adsorption removal device A DC voltage of 500V / 20mm was applied between them. Then, the particle size distribution and the amount of particles before and after the treatment were measured based on the micro track particle size analysis measurement method at Sagamihara Analysis Center, Japan Analyst Co., Ltd.

[0041] The results are shown in the graph of FIG. As can be seen from Fig. 4, in the particle size distribution, the particle size distribution before the treatment ranged from 2.12 to 11; whereas after the treatment (the particle size distribution changed from 2.12-15.55). The amount of particles is reduced after treatment compared to before treatment The transition of particle size distribution is effectively agglomerated and coarsened, and these coarsened particles are charged. It was confirmed that the particles were filtered more reliably by passing through the coagulation filtration device, and specifically, it was confirmed that particles of 5 m or more could be removed almost completely. It is shown that the adsorption removal of was effectively performed.

[0042] Next, among the specific devices of the representative embodiments shown in the above figures;! To 3, the rotating electrode type adsorption / removal device "ZETEC R-1000" (500V / 20mm, throughput 1000L / h: Example) 3. Processing volume 2000L / h: Example 4) and the conventional centrifugal separator “Alfa Laval SU type SA oil purifier” (manufactured by Alpha 'Laval Co., Ltd.) (4000 revolutions) (Comparative Example 1 ), The residual carbon content before treatment and the FCC catalyst particle concentration were analyzed after treating the same FCC-C heavy oil. Tables 2 to 5 show the analysis results of silica concentration, alumina concentration, pollution degree, and residual carbon content, respectively.

[0043] [Table 2]

(Silica concentration)

[0044] [Table 3] (Alumina concentration)

[0045] [Table 4]

(Pollution degree)

[0046] [Table 5]

(Residual carbon)

[0047] From Table 2, it can be seen from Table 2 that 24.37% could be removed in Example 3 of the rotating disk electrode, whereas it was hardly removed in Comparative Example 1 of centrifugation. According to Table 3, 45% or more of the rotating disk electrode in Examples 3 and 4 can be removed from alumina, whereas in Comparative Example 1 of the centrifugal separation, almost no removal has been achieved. From Table 4, it can be seen from Table 4 that as much as 46% was reduced in Example 3 of the rotating disk electrode, and the causative component of the contamination level was particles that could be removed by the rotating disk electrode. On the other hand, in Comparative Example 1 of centrifugal separation, it is reduced by 20%, and it can be seen that some of the causative particles can be removed. From Table 5, the residual carbon was reduced by 13% or more in Example 3 of the rotating disk electrode. There is a removal effect. On the other hand, it can be seen that the comparative example 1 of the centrifugal separation hardly removes.

Claims

The scope of the claims

[1] By applying a DC voltage of 300 to 1000 V per interval of 20 mm between the electrodes through which fuel oil circulates; the zeta potential of impurity particles in the fuel oil is reduced or eliminated, and agglomerated coarse particles And collecting means to collect the adsorbed impurity particles by coulomb force, thereby reducing the residual carbon content to 89% by weight or less and the impurity particle size to 5 to 10 in or less. A method for purifying fuel oil characterized by comprising

[2] A flat plate rotating electrode is provided in a container ground electrode filled with fuel oil, and a voltage is applied between the electrodes to reduce or eliminate the zeta potential of impurity particles in the flowing fuel oil. In addition to agglomerating and coarsening, it is charged to a potential opposite to the potential of the flat plate rotating electrode, adsorbed on both sides of the flat plate rotating electrode by Coulomb force, and collected by scraping off as a means of collecting adsorbed impurity particles. The method for purifying fuel oil according to claim 1, further comprising a scraper portion.

[3] The method for purifying fuel oil according to claim 2, wherein a plurality of flat plate rotating electrodes are arranged in parallel.

[4] The fuel oil supplied between the electrodes is provided with heating means for heating to 100 to 140 ° C in advance from 100 to; and the fuel oil according to any one of! To 3 Purification method.

[5] The discharged treatment liquid is further filtered using a charge aggregation filtration device.

4. The method for purifying the fuel oil as described in 1 above, wherein

[6] A purification device for use in the method for purifying fuel oil according to any one of claims;! To 5,

A flat plate rotation electrode is provided in a container ground electrode filled with fuel oil,

By applying a voltage between the electrodes, the zeta potential of the impurity particles in the flowing fuel oil is reduced or eliminated, and the particles are agglomerated and coarsened, and charged to a potential opposite to the potential of the plate rotating electrode. And voltage application means to attract the both sides of the flat plate rotation electrode by Coulomb force,

A fuel oil purifier characterized by comprising a scraper section for collecting adsorbed impurity particles by scraping.

7. The fuel oil purifier according to claim 6, wherein a plurality of flat plate rotating electrodes are arranged in parallel.

Yes

8. The fuel oil purifier according to claim 6 or 7, further comprising a heating means for heating the fuel oil supplied into the container ground electrode to 100 to 140 ° C in advance.

[9] The fuel oil purification device according to any one of [6] to [8], wherein the treatment liquid discharged from the container ground electrode is further supplied to a charged aggregation filtration device for filtration.