WO2010055997A2

WO2010055997A2 - Crude oil pretreatment system and method for removing sludge included in crude oil

Info

Publication number: WO2010055997A2
Application number: PCT/KR2009/005329
Authority: WO
Inventors: 한명규
Original assignee: 해룡화학(주)
Priority date: 2008-11-11
Filing date: 2009-09-18
Publication date: 2010-05-20
Also published as: KR100937022B1; CA2747909A1; CA2747909C; WO2010055997A3

Abstract

The crude oil pretreatment system of the present invention for removing sludge contained in crude oil comprises: a centrifugal separator (12) for receiving crude oil containing sludge, and stirring and rotating the crude oil in the internal space thereof, thereby separating the crude oil into a sludge component with a relatively higher specific gravity and a crude oil component with a relatively lower specific gravity, and discharging the sludge component and the crude oil component; a sludge oil recovery means for pressing the sludge discharged from the centrifugal separator and recovering the oil remaining in the sludge; and a crude oil storage tank for receiving and storing the discharged crude oil from which sludge has been removed by the centrifugal separator, and the oil that has been recovered by the sludge oil recovery means and then discharged. The present invention enables the sludge contained in crude oil and various petrochemical products to be removed in advance and only the crude oil with low sludge contents to be loaded into a tanker or stored in a crude oil storage tank, thereby preventing problems caused by sludge in the subsequent processes of transportation, storage, and refining.

Description

Crude oil pretreatment system and method for removing sludge contained in crude oil

The present invention relates to a crude oil pretreatment system and method for removing sludge contained in crude oil, and in particular, to remove the sludge contained in crude oil and various petroleum related products in advance to ship only crude oil having a low sludge content to the tanker or crude oil The present invention relates to a crude oil pre-treatment system and a method for preventing the occurrence of sludge in the subsequent transportation, storage, and refinery of crude oil by storing in a storage tank.

Today, petroleum is the core power source for industrial and economic activities around the world, and because of the benefits of modern civilization, almost all of the human resources are derived from petroleum, making it the most important energy source and basic material. can do. All mankind's activities were so deeply dependent on oil that modern oil-free civilization is now unimaginable.

Petroleum is obtained by refining crude oil extracted from underground or seabed oil fields.In the oil, various impurities such as clay, sand, gravel, and stone are mixed, and these impurities are sludged when transported or stored. It will precipitate and accumulate in sludge form. In general, crude oil produced in oil fields in oil producing countries is first transported through pipelines to crude oil storage tanks, shipped from tankers to oil tankers and transported to oil importing countries. The crude oil is then transferred to a nearby refinery plant by pipeline.

As described above, since crude oil is stored in a crude oil tank at each stage of transporting crude oil, the crude oil is taken out of the crude oil tank and transported to the next position. Crude sludge adheres to the bottom of the crude oil tank in a sticky and rigid form, so once the sludge has settled to the bottom of the tank, it is not possible to remove it through the pipe, and it has to be removed by applying special chemicals and techniques.

Typically, crude oil storage tanks installed near the port of oil importing country are very large tanks with a diameter of 75-100 meters and a storage capacity of 700,000 to 1 million barrels. The accumulated sludge is used for sludge removal by open inspection. Stack until it is cleaned. In most countries, oil tanks are usually required by law to be opened every 10 years. For 700,000 barrels of oil tanks, an open inspection typically yields 10,000 tonnes of sludge.

1 is a schematic diagram of a conventional crude oil transportation and storage system, and FIG. 2 is a schematic diagram illustrating methods applied to a conventional crude oil transportation and storage system.

Referring to Figure 1, the crude oil (5) contained in the crude oil tank (3a) of the oil tanker (3) is produced in the oil field of the oil producing country and stored in the crude oil storage tank there and shipped, the crude oil storage tank of the oil producing country Although some of the sludge has sedimented out, it still contains a large amount of sludge such as soil, sand, gravel and stone. The tanker (3) operates the mixer in the crude oil tank (3a) continuously while sailing from oil producing countries such as Arab countries to Korea for about 40-50 days to prevent sludge from settling in the crude oil tank (3a). do. When the oil tanker (3) arrives at the port of the importing country, the crude oil (5) is transferred to the crude oil storage tank (2) through the transfer line (4), in which the crude oil (5) is stirred by a mixer and pumped up. Transfer the sludge together to the crude oil storage tank 2 (see Fig. 2).

In most cases, the crude oil storage tank 2 is in the form of a floating roof (2a) so that the lid (2a) rises accordingly when the crude oil (5) is filled in the tank (2). While the crude oil storage tank 2 is in use, sludge 2b is continuously deposited on the bottom thereof, and the sludge 2b can be discharged to the outside only by opening and cleaning the crude oil storage tank 2.

In FIG. 1, reference numeral 1 denotes a plant facility of a refinery, and reference numeral 6 denotes a pump installed on a transfer line 4 for transportation of crude oil 5.

To remove the sludge accumulated in the crude oil tank, the crude oil washing (COW) method, the Supermax method, the Megamax method, the Bravo system method and the Zeros method have been Developed. All of these methods, except for the Zerose method, are brand names of foreign technologies related to tank cleaning. After opening the lid of the tank and spraying chemicals into the tank to melt the sludge, a person wears special equipment and enters the tank directly. It is common in that sludge is shoveled out by hand. On the other hand, the ZERO method is a method of dissolving sludge using a chemical that dissolves sludge and a high-pressure cleaning liquid injector, and then sucking the sludge with a sludge pump, which has the advantage that a person does not enter the tank directly. The cost of the tank cleaning work has been greatly increased because of the necessity and the equipment.

Typically, the cost of cleaning a 700,000-barrel crude oil tank using non-Zeros processes is about 300 million won and takes about a month. The removal of sludge in a crude oil tank is expensive and time-consuming. Not only is this necessary, but it is also an economically and environmentally disadvantageous operation because it has to take out and treat crude oil sludge which is harmful to the environment.

Problems arising from the accumulation of sludge in crude oil tanks are the same for not only oil importing countries but also oil producing countries. In oil producing countries, many crude oils can only be stored in crude oil tanks until they are transported to demand. Cleaning oil tanks is expensive and time-consuming to remove sludge accumulated in crude oil tanks. For example, in the oil producing country, about 2,000 crude oil tanks are installed. If you clean the crude oil tank every 10 years, you need to stop using it and open the lid every year.

As mentioned above, all the problems caused by the sludge in the crude oil tank are caused because the impurities mixed in the mining process of crude oil are still contained in the crude oil. Until now, the oil industry transports or stores crude oil as it is It is inevitable that sludge builds up in the crude oil tank in the process, and it has been assumed that the contractor will be forced to clean the crude oil tank.

Now, however, there is a need to move away from these conventional practices and develop a new way of handling crude oil that will ensure that sludge does not occur in the oil tank at all, or that as little sludge occurs as possible. In other words, if crude oil is separated and removed before it enters the tank, the amount of sludge generated can be reduced, thereby reducing the cost and time required for cleaning the oil tank and increasing the added value of the petroleum industry by distributing high quality crude oil. will be.

The present invention was created by the above-mentioned problems of the prior art and the necessity of new technology development, and is capable of preventing sludge from accumulating in the crude oil tank in advance by removing sludge contained in crude oil and various petroleum products. An object of the present invention is to provide a crude oil pretreatment system and a method for removing sludge contained therein.

Crude oil pretreatment system for removing the sludge contained in the crude oil provided by the present invention for achieving the above object, the crude oil containing the sludge composed of at least one material of soil, sand, gravel, stone in the interior space A centrifuge 12 which separates and discharges the sludge component having a relatively high specific gravity and the crude oil component having a relatively low specific gravity by stirring and rotating; Sludge oil recovery means for compressing the sludge discharged from the centrifuge to recover the oil remaining in the sludge; And a crude oil storage tank for transporting and storing the crude oil discharged from the sludge from the centrifuge and the oil recovered and discharged from the sludge oil recovery means.

In addition, the crude oil pretreatment method for removing the sludge contained in the crude oil provided by the present invention in order to achieve the above object, the crude oil containing the sludge composed of at least one material of soil, sand, gravel, stone centrifugal separator (12) A first step of separating into a sludge component having a relatively high specific gravity and a crude oil component having a relatively low specific gravity using the; A second step of recovering the oil remaining in the sludge by compressing the sludge discharged from the centrifuge (12) using a decanter centrifuge; And a third step of producing recycled fuel or solidifying the sludge by using the sludge discharged in the second step.

According to the crude oil pretreatment system and method according to the present invention, it is more efficient and safer than the conventional methods for treating sludge in a crude oil tank, and the scale and sludge in the crude oil are removed in advance, and thus, It has the advantages of improving the operating efficiency of plant facilities such as crude oil tanks, etc., improving the productivity of oil refining industry, and reducing the cost of retrofitting facilities such as crude oil tanks.

In addition, when the crude oil is pretreated using the present invention, since the amount of sludge accumulated in the crude oil tank is greatly reduced, there is an advantage of shortening the air during the cleaning operation of the crude oil tank.

In addition, in the crude oil pretreatment system and method according to the present invention, since sludge is obtained at all times in the pretreatment process of crude oil, it is possible to stably produce recycled fuel using the sludge, and thus further industrial development and environment due to resource recycling. It has the advantage of obtaining a protective effect.

In addition, the present invention has the advantage of pioneering a new field of promising overseas expansion of the plant construction industry by exporting, construction and operation of plant equipment related to crude oil pretreatment system to overseas oil producing countries.

1 is a schematic diagram of a conventional crude oil transportation and storage system, and FIG. 2 shows sludge accumulated in a crude oil storage tank 2 after transferring crude oil in an oil tanker 3 to a crude oil storage tank 2 in the conventional system of FIG. It is presented about the method of removing.

3 is a block diagram of a crude oil pretreatment system for removing sludge contained in crude oil according to the present invention.

4 shows the centrifuge portion 12 in FIG. 3 in more detail.

FIG. 5 shows the sludge oil recovery means 17, 18 in FIG. 3 and subsequent processes.

FIG. 6 shows the secondary sludge oil recovery means 18 of FIG. 5 and subsequent processes.

FIG. 7 shows a plurality of centrifuges 12 and primary sludge oil recovery means 17 in parallel in the crude oil pretreatment system of FIG.

8 is a flowchart in which the crude oil pretreatment system according to the present invention is applied and operated.

* Description of symbols on main parts of the drawings *

1: Refinery plant facility 2: Crude oil storage tank

2a: floating roof 2b: sludge

3: oil tanker 3a: crude oil tank

4, 4a: Crude oil transfer line 5: Crude oil

6: pump 10: crude oil production equipment

11: Oilfield 11a: Crude Oil Transfer Line

12: centrifuge 13a: nitrogen tank

13b: pump 13c: gas injection pipe

13d: gas injection nozzle 14a: gas collection tank

14b: liquefier 14c: liquefied petroleum gas storage tank

14d: outlet valve 15a: crude oil transfer line

15b: Joint part 16: Crude oil storage tank

17, 18: sludge oil recovery means 19: sludge fuelization and solidification means

20: recycled fuel product 22: centrifugation means

27: primary sludge oil recovery means 28: secondary sludge oil recovery means

30: even oil 31: crude oil pipe

51, 51a: sludge 51b: sludge cake

51c: extracted oil 100, 100 ': sludge removal system

120: drive motor 121: mixer

122: crude oil inlet 123: crude oil outlet

124: oil sludge outlet 124a: sludge feed pipe

171: drum driving motor 172: rotary drum

173: screw drive motor 173a: gearbox

174: casing 174a: bearing block

174b: slot 175: frame

175a, 175b: dust isolator 176: screw conveyor

176a: screw 176b: oil sludge outlet

178: pump 179: sludge storage

181: microorganism deoiling means 182: electro-osmotic deoiling means

183: distillation deoiling means

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and effect of the crude oil pre-treatment system and method for removing sludge contained in the crude oil according to the present invention.

In the present invention, the pre-treatment system of crude oil refers to a crude oil tank containing sludge (soil, sand, gravel, paraffin, other minerals, etc.) contained in crude oil introduced in Korea and crude oil processed in an oil producing country. It refers to a system and apparatus that removes the sludge in advance and recycles the sludge.

3 is a block diagram of a crude oil pretreatment system for removing sludge contained in crude oil according to the present invention. Referring to Figure 3, the crude oil produced in the crude oil production equipment 10, such as oil field 11 is transported through the crude oil transfer line (11a) with the sludge therein, conventionally the crude oil is directly to the crude oil storage tank (16) Although entered and stored, the present invention allows sludge to be removed by the crude oil pretreatment system 100 and only clean crude components enter the crude oil storage tank 16 before the crude oil enters the crude oil storage tank 16.

The crude oil pretreatment system 100 of the present invention is composed of a centrifuge 12, a sludge oil recovery means 17 and a sludge fuelization and solidification treatment means 19, and the second sludge again after the sludge oil recovery means. Oil recovery means 18 may be provided (see FIGS. 5 and 6).

As the centrifuge 12, a wide variety of devices can be used. In the specification of the present invention, for convenience of description, a centrifugal separator of a general cylinder and cone shape is combined and described. The centrifuge of the present invention has the same basic structure as a conventional water treatment centrifuge, but is functionally occupied in that it is a crude oil centrifuge. Inside the centrifuge 12, a stirrer (mixer) 121 is rotated by the drive motor 120, and the stirrer 121 is continuously rotated so that the crude oil in the centrifuge 12 rotates and flows. Crude oil is introduced into the centrifuge through the crude oil inlet 122 (refer to FIG. 4) of the centrifuge 12, and the sludge component with heavy specific gravity while the crude oil is rotated by the rotation of the stirrer 121 is transferred to the centrifuge 12. It concentrates toward the inner wall and gradually descends along the inner wall, causing it to settle in the lower portion of the cone shape. The crude oil component 50 having a low specific gravity in the centrifuge 12 is transferred to the crude oil transfer line 15 through the crude oil outlet 123 (see FIG. 4) installed at the top of the centrifuge 12, and then the crude oil storage tank ( Up to 15).

On the other hand, the sludge 51 collected in the lower part of the centrifuge 12 is discharged into the sludge oil recovery means 17, the sludge oil recovery means 17 is preferably implemented as a decanter centrifuge. Do. However, since the oil recovery means 17 is for recovering oil by squeezing sludge containing a large amount of oil components, the oil recovery means 17 may not be a decanter type centrifuge illustrated in FIGS. 3 and 5. In other words, any type of crimping device may be used as long as the device can achieve the same effect of squeezing oil from the sludge 51.

When the sludge 51 enters into the sludge inlet of the sludge oil recovery means 17 shown in Fig. 3, the sludge 51 by the screw conveyor 176 (see Fig. 5) installed to rotate in the opposite direction in the rotating drum 172. The oil inside is compressed and comes out. The sludge 51 that has entered the sludge oil recovery means 17 has a significantly lower oil content after squeezing the oil component therein, thus becoming a sludge cake 51b, which is sludge cake 51b. The fuel and solidification means 19 may be used for the production of recycled fuel (20; refuse derived fuel) or may be incinerated in a high temperature incinerator to be ash to be regenerated into materials such as concrete and asphalt concrete. Can be.

On the other hand, the oil (51c) recovered by the sludge oil recovery means 17 is transported to the crude oil transfer line (15a) by the pump 178, meets the original crude oil transfer line (15) and the crude oil storage tank (16) To enter. In the present invention, the crude oil stored in the crude oil storage tank 16 is far less sludge than the crude oil stored in the oil field 11 without any pretreatment before, and the purity is high. It can be sold at a much higher price than conventional crude oil, and even from the point of view of a crude oil importer, high-purity crude oil can produce more gasoline, kerosene, diesel, etc., so that a higher price is beneficial. For importing countries, importing high quality crude oil is not only economically profitable due to higher production yields of high quality fuels, but also in the long run, which can reduce the cost of cleaning and maintaining crude oil tanks. The environmental benefits can also be enjoyed as environmentally hazardous substances do not have to be brought into the country.

Therefore, the crude oil pretreatment system and method according to the present invention has advantages in that both the oil producing country and the crude oil importing country have great benefits by supplying high quality crude oil to the market by removing sludge in the crude oil when installed and applied to the oil producing country.

4 shows the centrifuge portion 12 in FIG. 3 in more detail. 3 and 4, the centrifuge 12 has a different structure from the centrifuge applied to a general water treatment process. That is, in the present invention, the centrifuge 12 developed for pretreatment of crude oil has light gases, such as methane, ethane, propane, butane, which are contained in the crude oil in the process of stirring the crude oil, so that these hard gases come out. Gases must be prevented from contacting outside oxygen and causing explosion. To this end, the centrifuge 12 should be further provided with a facility for injecting the explosion-proof gas into the centrifuge, and together with a facility for safely removing and treating the light gas components generated in the centrifuge 12 to the outside. Must be provided. In the present invention, it is preferable to use nitrogen (N ₂ ), which can be easily obtained and easily handled as the explosion-proof gas.

Nitrogen is stored in the explosion-proof gas storage tank 13a, and the nitrogen gas in the explosion-proof gas storage tank 13a is pressurized by the pump 13b and then the gas injection pipe 13c and the gas injection nozzle 13d. Through the centrifuge (12). Although only one gas injection nozzle 13d is shown in FIG. 4, since it is judged that it is effective to inject explosion-proof gas in various places of the centrifuge 12, a plurality of positions inside the centrifuge 12 are provided. It is preferable to provide gas injection nozzles 13d in the air.

On the other hand, the light gas components generated in the centrifuge 12 are discharged through the air vent (vent) and collected first in the gas collection tank 14a, and then liquefied by the liquefier 14b to store the liquefied petroleum gas storage tank ( 14c). The liquefied petroleum gas stored in the liquefied petroleum gas storage tank 14c may be distributed as in the normal liquefied petroleum gas.

In FIG. 4, reference numeral 20 denotes a trapped gas discharge pipe connected to the

centrifuge

12, and 14d is an outlet valve of the liquefied petroleum gas storage tank 14c. In addition, the crude oil 5 present as a supernatant in the centrifuge 12 is discharged to the crude oil transfer line 15 through the crude oil outlet 123, and the sludge 51 is the sludge outlet 124 below the centrifuge 12. Through the sludge feed pipe 124a is discharged into the sludge oil recovery means 17.

Although only one sludge oil recovery means 17 is shown in FIG. 3, FIG. 5 shows two sludge oil recovery means as another embodiment of the present invention. That is, the sludge oil recovery means 17 using the decanter type centrifuge was used as a primary sludge oil recovery means, and the secondary sludge oil recovery means 18 of another system was arrange | positioned at the rear end. The structure of the primary sludge oil recovery means 17 is installed inside the rotating drum 172 concentrically installed screw conveyor 176 to rotate in the opposite direction to the drum 172, the screw conveyor ( The oil sludge 51 is introduced into the internal space of the 176. The oil 51c is compressed from the sludge 51 by the opposite rotational action of the screw conveyor 176 and the rotating drum 172, and extracted. The oil 51c is discharged through the oil outlet located at the right side of FIG.

The rotating drum 172 disposed in the casing 174 is rotated in the first direction by the drum driving motor 171, and the screw conveyor 176 installed in the inner space of the rotating drum 172 is the screw driving motor 173. Rotate in a second direction opposite to the first direction. The sludge 51 enters the inner space of the screw conveyor 176 through the sludge feed pipe 124a and the inlet 174b and then rotates through the oil sludge outlet 176b by the rotation of the screw conveyor 176. On the inner wall of the Then, the screws 176a continuously formed at the periphery of the screw conveyor 176 forcibly transfer the sludge 51a to the left side of the figure while scratching the inner wall surface of the rotating drum 172, and in this process, the oil component 51c. ) Is pressed out from the sludge 51a. The oily sludge is discharged in the form of sludge cake 51b and stored in the sludge reservoir 179.

In FIG. 5, reference numeral 174a is a bearing block for supporting the shaft of the screw conveyor 176 in the

casing

174, and 173a is a gearbox for transmitting the power of the screw drive motor 173 to the screw conveyor 176. Meanwhile, the casing 174 is supported on the frame 175, and the vibration of the frame 175 is such that shock is absorbed by the

vibration isolators

175a and 175b. On the other hand, the oil 51c extracted and recovered by the primary sludge oil recovery means 17 is transferred to the crude oil storage tank through the crude oil transfer line 15a.

In addition, the sludge 51b discharged from the primary sludge oil recovery means 17 may be treated by the secondary sludge oil recovery means 18 to reduce the content rate. Also transferred to crude oil storage tanks.

According to the experiment of the inventors, the content of the sludge 51 discharged from the centrifuge 12 is about 80%, and the content of the sludge 51b discharged from the primary sludge oil recovery means 17 is about 60%. %, The second sludge oil recovery means 18 once again has been found to reduce the sludge content to about 40%.

FIG. 6 shows the secondary sludge oil recovery means 18 of FIG. 5 and subsequent processes. The secondary sludge oil recovery means 18 may constitute a deoiling means 181 using microorganisms, or may be configured by applying the current commercially available electro-osmotic deoiling means 182 or distillation deoiling means 183. It may be. Deoiling means using microorganisms is to use the chemical mechanism of fermentation using a kind of microorganisms so that the oil in the sludge is decomposed and drawn out, whereas the electro-osmotic deoiling means 182 has a negatively charged drum and a negative charge. It is a principle to supply the sludge between the caterpillar to dehydrate the oil in the sludge. The distillation deoiling means 183 is a method of deoiling oil from the sludge by heating the sludge so that the oil component is evaporated and cooling the evaporated gas oil again to obtain oil.

The crude oil pretreatment system according to the present invention may be applied to any one of the three secondary sludge oil recovery means 181, 182, and 183 of FIG. 6, and these deoiling means may be applied in duplicate or in parallel. .

The oil recovered from the secondary sludge oil recovery means 18 is transferred to a crude oil storage tank, and the sludge is used to produce or solidify recycled fuel by the sludge fueling and solidification treatment facility 19.

In FIGS. 3 to 6, only one centrifuge 12 and one primary sludge oil recovery unit 17 are shown. However, only one centrifuge may be insufficient to simultaneously process a large amount of crude oil at the actual crude oil pretreatment site. Therefore, it is preferable that a plurality of centrifuges 12 for processing the crude oil transferred from the crude oil production equipment 10 and sludge oil recovery means 17 at the rear end thereof are provided in parallel as necessary according to their capacity. In FIG. 7, the centrifuge means 22 is composed of a plurality of centrifuges 12, and a plurality of primary sludge oil recovery means 17 is installed at the rear end of each centrifuge 12. Each primary sludge oil recovery means 17 constitutes the primary sludge oil recovery means 27 as a whole. A plurality of secondary sludge oil recovery means 28 may also be installed, and the recovered oil is transferred to the crude oil storage tank 16, and then to the oil even 30, the crude oil pipe line 31, or the oil tanker 3. By each supply.

8 is a flowchart in which the crude oil pretreatment system according to the present invention is applied and operated. Compared with FIG. 1, in the past, crude oil was extracted in a crude oil storage tank as it was mined without removing sludge of crude oil in the oil producing country, and then loaded on an oil tanker and transported to an importing country, but the crude oil pretreatment system 100 according to the present invention When constructed in conjunction with the production facility 10, the crude oil from the crude oil production facility 10 is first subjected to a pretreatment process to remove sludge in the crude oil before storing it in a crude oil storage tank or loading it on an oil tanker. After the sludge is removed by the crude oil pretreatment system 100, clean crude oil is stored in the crude oil tank, so the crude oil tank of the oil producing country is less sludge deposited, the maintenance cost of the crude oil tank is reduced, and above all, the high quality crude oil is expensive. Profitability can be significantly improved by being able to sell at.

In addition, the crude oil pretreatment system according to the present invention is not necessarily required only for the oil producing country, and can be applied to the crude oil storage tank before the crude oil importing country as shown on the right side of FIG. In other words, the crude oil in the tanker is of poor quality so that the sludge becomes about 5 to 10%. When the crude oil is received as it is and stored in the crude oil storage tank (2), a huge amount of sludge accumulates in the crude oil tank, thereby increasing the efficiency of the crude oil tank. This will put a heavy burden on the refinery's refinery process. However, if the crude oil pretreatment system 100 ′ according to the present invention is applied to the stage immediately before the crude oil storage tank of the crude oil importing country, the crude oil received from the oil tank 3a of the oil tanker 3 is pre-treated in real time to remove sludge and then clean. Since the crude oil can be stored in the crude oil tank (2), it is possible to prevent the sludge from accumulating in the crude oil tank (2), the refinery processing process of the refinery can be much easier to operate.

Crude oil pretreatment system and method for removing sludge contained in crude oil according to the present invention is to remove the sludge in the crude oil prior to entering the tank while the crude oil is loaded in the tanker to transfer to the tank to prevent secondary and tertiary pollution due to sludge There is an effect to prevent, in particular, there is an advantage that can be linked to the waste resource recycling system.

The effects of the crude oil pretreatment system according to the present invention are summarized as follows.

(1) The normal supply of crude oil will be smooth,

(2) By reducing the speed of sludge accumulation in the tank, it is possible to shorten the air during the tank opening inspection and to ensure the operational stability of the plant equipment.

(3) It has the effect of preventing the trouble of the process of crude oil processing, reducing the thermal efficiency caused by the sludge, and increasing the output of the final petroleum products such as gasoline and kerosene.

(4) It can reduce the burden of waste disposal due to sludge and achieve the effect of resource recycling.

(5) It can solve various problems in the tank cleaning work, greatly reduce the work period, ensure the safety of workers, and improve the productivity of refinery equipment and extend the life of equipment.

The crude oil pretreatment system and method according to the present invention is a system for removing sludge contained in crude oil in advance, and is fundamentally differentiated from, and different from, existing methods of removing sludge such as COW method, Supermax, Megamax, etc. You can get much better effect than these. In particular, unlike the existing COW method is merely a method for removing only the sludge accumulated in the crude oil tank, the present invention is introduced by operating the crude oil storage tank only by removing the sludge in the crude oil while introducing crude oil into the crude oil storage tank. By doing so, it is possible to solve the process problems caused by sludge, increase the production volume, reduce the need for refurbishment, secure the safety of equipment and reduce the sludge treatment cost, and recycled fuel business by resource recycling. There is an advantage that can be linked to.

Claims

Crude oil containing sludge composed of at least one material of clay, sand, gravel or stone is taken and stirred and rotated in the internal space to make a relatively high specific sludge component and a relatively specific gravity A centrifugal separator (12) for separating and discharging into the smaller crude oil component;

Sludge oil recovery means for compressing the sludge discharged from the centrifuge to recover the oil remaining in the sludge; And

Crude oil pre-treatment to remove the sludge contained in the crude oil, comprising: a crude oil storage tank for transporting and storing the crude oil discharged by the sludge is removed from the centrifuge and the oil recovered and discharged from the sludge oil recovery means system.
The sludge contained in the crude oil according to claim 1, further comprising: sludge fueling and solidification treatment means for producing recycled fuel using the sludge discharged from the sludge oil recovery means or solidifying the sludge. Crude oil pretreatment system to remove.
According to claim 1, Secondary sludge oil recovery means for lowering the sludge content by receiving the sludge discharged from the sludge oil recovery means to further recover the oil in the sludge; , Crude oil pretreatment system to remove sludge contained in crude oil.
The method of claim 3, wherein the secondary sludge oil recovery means, characterized in that using any one of the method of deoiling, microinfiltration or distillation using microorganisms. Crude Oil Pretreatment System to Remove Sludge.
The method of claim 1, wherein the centrifuge 12,

A crude oil inlet 122 for introducing crude oil containing sludge;

Agitator 121 for mixing the crude oil while rotating by the drive motor 120;

Sludge outlet 124 for discharging the sludge accumulated in the outer and lower parts of the centrifuge 12,

The centrifuge 12, explosion-proof gas injection means for injecting the explosion-proof gas into the centrifuge so that light gas generated by stirring the crude oil inside the centrifuge does not explode; And

Crude oil pre-treatment system for removing the sludge contained in the crude oil; characterized in that coupled; discharge gas liquefaction storage means for liquefying by discharging the light gases generated in the centrifuge (12) to the outside.
According to claim 5, The explosion-proof gas injection means,

Explosion-proof gas storage tank (13a) for storing the explosion-proof gas containing nitrogen;

A pump 136 for pressurizing the gas in the explosion-proof gas storage tank 13a; And

And a gas injection nozzle (13d) for injecting the explosion-proof gas pressurized by the pump (136) into the centrifuge (12). The crude oil pretreatment system for removing sludge contained in crude oil.
According to claim 5, The exhaust gas liquefaction storage means,

A collecting gas discharge pipe 20 for collecting light gas generated by stirring the crude oil in the centrifuge 12 and discharging it to the outside of the centrifuge;

A gas collecting tank 14a for storing the hard gas delivered by the collecting gas discharge pipe 20;

A liquefier (14b) for liquefying the gas of the gas collecting tank (14a); And

And a liquefied petroleum gas storage tank (14c) for storing the liquefied gas; crude oil pretreatment system for removing sludge contained in crude oil.
According to claim 1, The sludge oil recovery means,

A rotating drum 172 rotated by a drum driving motor; And

Installed in the rotary drum 172 and rotated by a screw drive motor 173, a plurality of screws (176a) is formed in the periphery to press the sludge continuously in one direction on the inner wall surface of the rotary drum 172 and Conveying screw conveyor 176; including,

While the sludge discharged from the centrifuge 12 is compressed and transported in one direction by the screw conveyor 176, the crude oil components are separated and discharged separately, and the sludge from which the crude oil is removed is reduced in content (함유). Crude oil pretreatment system for removing sludge contained in crude oil, characterized in that discharged in the form.
The crude oil pretreatment system according to any one of claims 1 to 8, wherein the crude oil pretreatment system is installed in association with a crude oil production facility of a crude oil production site, and immediately processes the crude oil transferred from the crude oil production facility to remove sludge in the crude oil. The crude oil pre-treatment system for removing sludge contained in crude oil, characterized in that the crude oil is reduced in the sludge content is stored in the crude oil storage tank or shipped to the tanker.
9. The crude oil pretreatment system according to any one of claims 1 to 8, wherein the crude oil pretreatment system is installed in connection with a refinery storage tank facility of a refinery located in a crude oil importing country, and immediately treats crude oil transferred from an oil tanker to sludge in crude oil. Removing and removing the sludge in the crude oil storage tank, characterized in that for storing the crude oil, crude oil pre-treatment system for removing the sludge contained in the crude oil.
Crude oil containing sludge composed of at least one material among soil, sand, gravel and stone is separated and discharged into a sludge component having a relatively high specific gravity and a crude oil component having a relatively low specific gravity using a centrifuge 12. Stage 1;

A second step of recovering the oil remaining in the sludge by compressing the sludge discharged from the centrifuge (12) using a decanter centrifuge;

And a third step of producing regenerated fuel or solidifying the sludge by using the sludge discharged in the second step. The crude oil pretreatment method of removing sludge contained in crude oil.