Oil slurry purification system and method

Abstract

The invention relates to the technical field of oil slurry purification, in particular to an oil slurry purification system and method. The purification system comprises a pretreatment box body and a raw material tank which are communicated with each other, the pretreatment box body is provided with an oil delivery pump, and the purification system further comprises a low-speed centrifuge communicated with the raw material tank; the primary buffer oil tank is communicated with the low-speed centrifugal machine; the high-speed centrifugal machine is communicated with the primary buffer oil tank; the buffering oil cleaning tank is communicated with the high-speed centrifugal machine; the operation liquid centrifugal machine is communicated with the buffer oil cleaning tank; the operation oil tank communicates with the operation liquid centrifugal machine, and the purification method is achieved based on the system. The oil slurry purification efficiency can be improved, meanwhile, the oil slurry purification cost can be well reduced, the good purification effect is achieved, and high economical efficiency is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil slurry purification, and in particular to an oil slurry purification system and method. Background Art

[0002] FCC is one of the most important processes in modern oil refineries, which converts heavy crude oil into high-octane gasoline, cracked gas, diesel and other light oil products. A large amount of slurry oil is produced during the catalytic cracking of heavy crude oil. The slurry oil is mainly used as fuel. Since a large amount of heavy oil catalyst powder is added during the catalytic cracking process, the slurry oil has the characteristics of high density, high aromatic content, low hydrogen content and high sulfur content. Direct use as industrial heavy fuel is prone to burner wear and furnace ash accumulation. Therefore, it is necessary to purify the catalyst powder and other solids in the slurry oil.

[0003] Currently, the commonly used methods for oil slurry purification mainly adopt natural sedimentation method, filtration separation method, centrifugal separation method or electrostatic separation method. However, due to the high viscosity and density of oil slurry at room temperature, the speed and purification efficiency of natural sedimentation method are not good. Due to the large number of solid particles in the oil slurry, the filter element is easily blocked and damaged when using filtration separation method. During the use of centrifugal separation method, the centrifuge needs to consume a large amount of operating fluid, resulting in a high cost of oil slurry purification. Summary of the invention

[0004] The present invention provides an oil slurry purification system and method, which can overcome certain or some defects of the prior art.

[0005] According to the oil slurry purification system of the present invention, it includes a pretreatment box and a raw material tank that are interconnected. The pretreatment box is used to store the oil slurry to be treated. An oil delivery pump is provided at the pretreatment box. The oil delivery pump is used to deliver the oil slurry to be treated to the raw material tank. The system also includes: a low-speed centrifuge, which is connected to the raw material tank and is used to separate large-size particles in the oil slurry to be treated to produce a first oil phase and a first slag phase; a primary buffer oil tank, which is connected to the low-speed centrifuge and is used to receive and heat the first oil phase; a high-speed centrifuge, which is connected to the primary buffer oil tank and is used to separate small-size particles in the first oil phase to produce a second oil phase and a second slag phase; a buffer clean oil tank, which is connected to the high-speed centrifuge and is used to receive the second oil phase and deliver it to an oil storage tank; an operating liquid centrifuge, which is connected to the buffer clean oil tank and is used to separate tiny particles in the second oil phase to produce a third oil phase; and an operating oil tank, which is connected to the operating liquid centrifuge and is used to receive the third oil phase and deliver it to the high-speed centrifuge and the low-speed centrifuge.

[0006] Furthermore, it also includes a circulation component, which includes a buffer slag box connected to the low-speed centrifuge and the high-speed centrifuge, and a horizontal screw machine connected to the buffer slag box, the buffer slag box is used to connect the first slag phase and the second slag phase, the horizontal screw machine is used to receive the contents in the buffer slag box and separate the fourth oil phase and the waste slag phase, and also includes a buffer circulation oil tank for receiving the fourth oil phase and transporting it to the pretreatment box.

[0007] Furthermore, a first heating device is provided in the buffer slag box, and a first conveying branch connected to the horizontal screw machine is provided at the buffer slag box. The first conveying branch is provided with a first gear pump, a first flow meter, a first temperature sensor and a first electric three-way valve in sequence along the conveying direction. The first electric three-way valve has a first reflux port, and the first reflux port is used to communicate with the buffer slag box.

[0008] Furthermore, a reflux branch is provided at the buffer circulation oil tank, the reflux branch is used to communicate with the pretreatment box, and a second gear pump is provided at the reflux branch; a first overflow port is provided at the top of the buffer circulation oil tank, and the first overflow port is used to communicate with the buffer slag box.

[0009] Furthermore, a second heating device and a stirring device are provided in the raw material tank, a second conveying branch connected to the low-speed centrifuge is provided at the bottom, and the second conveying branch is provided with a first double filter, a third gear pump, a second flow meter, a second temperature sensor and a second electric three-way valve in sequence along the conveying direction. The second electric three-way valve has a second reflux port, and the second reflux port is used to connect with the raw material tank; a second overflow port is provided on the top of the raw material tank, and the second overflow port is used to connect with the pretreatment box.

[0010] Furthermore, a first tubular radiator is connected between the second temperature sensor and the second electric three-way valve. A first temperature control valve is provided at the first tubular radiator. The first temperature control valve is used to output steam. The first temperature control valve is electrically connected to the second temperature sensor.

[0011] Furthermore, a third heating device is provided in the first-level buffer oil tank, and a third conveying branch connected to the high-speed centrifuge is provided at the bottom. The third conveying branch is provided with a fourth gear pump, a third flow meter, a third temperature sensor and a third electric three-way valve in sequence along the conveying direction. The third electric three-way valve has a third reflux port, and the third reflux port is used to connect with the first-level buffer oil tank; a third overflow port is provided at the top of the first-level buffer oil tank, and the third overflow port is connected to the buffer slag box.

[0012] Furthermore, a second tubular radiator is provided between the third flowmeter and the third temperature sensor, a second temperature control valve is provided at the second tubular radiator, the second temperature control valve is used to output steam, and the second temperature control valve is electrically connected to the third temperature sensor.

[0013] Furthermore, a fourth delivery branch connected to the operating liquid centrifuge is provided at the buffer clean oil tank, and a fifth gear pump is provided on the fourth delivery branch; a fifth delivery branch is also provided at the buffer clean oil tank, and the fifth delivery branch is connected to an oil storage tank, and a sixth gear pump and a precision filter are provided on the fifth delivery branch in sequence, and there are multiple precision filters that are connected in parallel.

[0014] Furthermore, a sixth delivery branch connected to the low-speed centrifuge and a seventh delivery branch connected to the high-speed centrifuge are provided at the operating oil tank; The sixth delivery branch is provided with a seventh gear pump, a second duplex filter and a first operating liquid valve group in sequence, and a fourth reflux port is correspondingly provided at the low-speed centrifuge, and the fourth reflux port is used to communicate with the operating oil tank; the seventh delivery branch is provided with an eighth gear pump, a third duplex filter and a second operating liquid valve group in sequence, and a fifth reflux port is correspondingly provided at the high-speed centrifuge, and the fifth reflux port is used to communicate with the operating oil tank; an overflow port, a fourth overflow port, is provided on the top of the operating oil tank, and the fourth overflow port is used to communicate with the buffer clean oil tank.

[0015] The present invention also provides a method for purifying oil slurry, which comprises the following steps: Step S1: The oil slurry to be treated is transported from the pretreatment box to the raw material tank, stirred and heated to 120-130° C., and transported to a low-speed centrifuge for separation to obtain the first oil phase; Step S2: transporting the first oil phase to a buffer oil tank, heating it to 120-130° C., and then transporting it to a high-speed centrifuge to separate and obtain a second oil phase; Step S3: transporting a portion of the second oil phase to a buffer clean oil tank, and transporting the rest to an oil storage tank for storage; Step S4: transporting the material in the buffer clean oil tank to the operating liquid centrifuge for centrifugal separation to obtain a third oil phase, and transporting it to the operating oil tank; Step S5: The operating oil tank continuously supplies the substances in the operating oil tank to the low-speed centrifuge and the high-speed centrifuge for recycling.

[0016] Furthermore, the rotation speed of the low-speed centrifuge is 8000 rpm, the rotation speed of the high-speed centrifuge is 10000 rpm, and the rotation speed of the operating liquid centrifuge is 12000 rpm. Beneficial Effects

[0017] 1. The oil slurry is graded and separated by a low-speed centrifuge and a high-speed centrifuge, thereby improving the separation efficiency of solid particles in the oil slurry and reducing the use cost compared with the existing technology.

[0018] 2. By using the oil slurry purification system itself to produce operating fluid to supply high-speed centrifuges and low-speed centrifuges, there is no need for an external operating fluid supply system, which not only improves the utilization efficiency of the oil slurry, but also reduces the operating cost of the oil slurry purification system.

[0019] 4. The oil slurry purification system can operate continuously and has strong stability.

[0020] 3. By collecting and separating the slag phase, it is convenient to recycle the waste slag phase later. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the oil slurry purification system; Figure 2 It is a schematic diagram of the structure of the loop component; Figure 3 This is a structural diagram of the raw material barrel; Figure 4 This is a structural diagram of the first-level buffer oil tank; Figure 5 This is a schematic diagram of the structure of the buffer clean oil tank and the operating oil tank; Figure 6 The flowchart of the oil slurry purification method is shown in FIG. DETAILED DESCRIPTION

[0022] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0023] See Figure 1-5 The present embodiment provides an oil slurry purification system, which includes a pretreatment box (not shown in the figure) and a raw material tank 1 which are interconnected. The pretreatment box is used to store the oil slurry to be treated. The pretreatment box is provided with an oil pump (not shown in the figure). The oil pump is used to transport the oil slurry to be treated to the raw material tank 1. The above-mentioned oil slurry to be treated is a product after catalytic cracking of heavy oil.

[0024] Alternatively, a second heating device and a stirring device are provided in the raw material tank 1. The second heating device is a coil, and the stirring device is a stirring shaft with fan blades, which is rotatably arranged in the raw material tank 1 and rotated by the flow of fluid, or driven by a motor. By stirring and heating the oil slurry in the raw material tank 1, the fluidity of the oil slurry can be better improved to prevent the oil slurry from being blocked during transportation. A second conveying branch 12 connected to the low-speed centrifuge 2 is provided at the bottom of the raw material tank 1. The second conveying branch 12 is provided with a first double filter 1201, a third gear pump 1202, a second flow meter 1203, a second temperature sensor 1204 and a second electric three-way valve 1205 in sequence along the conveying direction. The second electric three-way valve 1205 has a second reflux port 1206, and the second reflux port 1206 is used to connect to the raw material tank 1.

[0025] Specifically, the first double filter 1201 can prevent the second delivery branch 12 from being blocked. The third gear pump 1202 is a 6T gear pump, which is used to deliver the material in the raw material tank 1 to the low-speed centrifuge 2. The second flow meter 1203 is used to monitor the flow of the second delivery branch 12. The second temperature sensor 1204 can monitor the temperature of the fluid out of the second delivery branch 12. When the temperature reaches the set value, the second electric three-way valve 1205 delivers the fluid to the low-speed centrifuge 2, otherwise it flows back to the raw material tank 1 to continue heating.

[0026] In some specific embodiments, a first tubular radiator 1207 is connected between the second temperature sensor 1204 and the second electric three-way valve 1205 . A first temperature control valve 1208 is provided at the first tubular radiator 1207 . The first temperature control valve 1208 is used to output steam, and the first temperature control valve 1208 is electrically connected to the second temperature sensor 1204 .

[0027] Specifically, the first tubular heat exchanger is used to further heat the fluid in the second delivery branch 12 to compensate for the heat loss when the second delivery branch 12 delivers the fluid. The heating is used to control the steam volume of the first temperature control valve 1208 through the second temperature sensor 1204. When the second temperature sensor 1204 senses that the fluid temperature reaches the set value, the second electric three-way valve 1205 delivers the fluid to the low-speed centrifuge 2.

[0028] Furthermore, a second overflow port 101 is provided on the top of the raw material tank 1, and the second overflow port 101 is used to communicate with the pretreatment box. Therefore, when there is too much oil slurry to be treated in the raw material tank 1, it can be returned to the pretreatment box through the second overflow port 101, thereby avoiding oil slurry leakage caused by excessive pressure in the raw material tank 1.

[0029] The oil slurry purification system further comprises a low-speed centrifuge 2 which is connected to the raw material tank 1 and is used for separating large-size particles in the oil slurry to be processed to produce a first oil phase and a first slag phase.

[0030] Specifically, the rotation speed of the low-speed centrifuge 2 is 8000rpm, the diameter range of the above-mentioned large-size particles is 20-80μm, the low-speed centrifuge 2 is a self-draining centrifuge, and the first-level buffer oil tank 3 can improve the fluidity of the first oil phase by heating the first oil phase, thereby facilitating the centrifugal separation of the small-size particles therein.

[0031] Furthermore, the oil slurry purification system also includes a high-speed centrifuge 4 connected to the primary buffer oil tank 3, which is used to separate small-size particles in the first oil phase to produce a second oil phase and a second slag phase, wherein the rotation speed of the high-speed centrifuge 4 is 10000rpm, and the diameter range of the above-mentioned small-size particles is 0-20μm. By removing large-size particles and small-size particles, the oil slurry is purified and the treated oil slurry is output. Through the above-mentioned two centrifugal separations, solid particles of two different particle size ranges can be separated respectively. Compared with direct separation according to small particle size, this structure can better protect the centrifuge and reduce the separation pressure of the centrifuge, thereby improving the separation efficiency of solids. Moreover, through this structure, the solid content of the oil slurry can be controlled within 50ppm without using electrostatic separation, which better reduces the use cost.

[0032] The oil slurry purification system further comprises a buffer clean oil tank 5, which is connected to the high-speed centrifuge 4 and is used to receive the second oil phase and transport it to an oil storage tank; Specifically, a fifth delivery branch 15 is also provided at the buffer clean oil tank 5, and the fifth delivery branch 15 is connected to an oil storage tank (not shown in the figure). A sixth gear pump 1501 and a precision filter 1502 are provided on the fifth delivery branch 15 in sequence. There are multiple precision filters 1502 and they are connected in parallel with each other. The oil tank in the buffer clean oil tank 5 is finally precisely filtered and transported through the fifth delivery branch 15, which better facilitates the storage of the purified oil slurry.

[0033] In a certain embodiment, the oil slurry purification system also includes an operating liquid centrifuge 6, which is connected to the buffer clean oil tank 5 and is used to separate tiny particles in the second oil phase, where the tiny particles are solid particles below 5 μm, thereby producing a third oil phase. The third oil phase can meet the standards of the operating liquid and can be used as the operating liquid of the high-speed centrifuge 4 and the low-speed centrifuge 2. Therefore, the third oil phase is transported to an operating oil tank 7, which is connected to the operating liquid centrifuge 6 and is used to receive the third oil phase and transport it to the high-speed centrifuge 4 and the low-speed centrifuge 2. This can achieve the production of operating liquid for consumption by the high-speed centrifuge 4 and the low-speed centrifuge 2 while purifying the oil slurry, thereby eliminating the need to provide additional operating liquid, saving the cost of use, and because the operating liquid can be recycled in the high-speed centrifuge 4 and the low-speed centrifuge 2, it also avoids the use of two sets of oil supply systems, thereby saving space and having a higher degree of integration.

[0034] Furthermore, a sixth delivery branch 16 connected to the low-speed centrifuge 2 and a seventh delivery branch 17 connected to the high-speed centrifuge 4 are provided at the operating oil tank 7, and a seventh gear pump 1601, a second duplex filter 1602 and a first operating liquid valve group 1603 are provided on the sixth delivery branch 16 in sequence, and a fourth reflux port 1604 is correspondingly provided at the low-speed centrifuge 2, and the fourth reflux port 1604 is used to communicate with the operating oil tank 7, and an eighth gear pump 1701, a third duplex filter 1702 and a second operating liquid valve group 1703 are provided on the seventh delivery branch 17 in sequence, and a fifth reflux port 1704 is correspondingly provided at the high-speed centrifuge 4, and the fifth reflux port 1704 is used to communicate with the operating oil tank 7.

[0035] Among them, the seventh gear pump 1601 and the eighth gear pump 1701 are both 1T gear pumps, the sixth gear pump 1501 can transport the operating fluid to the low-speed centrifuge 2, and the seventh gear pump 1601 can transport the operating fluid to the high-speed centrifuge 4, thereby facilitating the consumption of the high-speed centrifuge 4 and the low-speed centrifuge 2. The above structure can ensure the continuous and stable operation of the high-speed centrifuge 4 and the low-speed centrifuge 2.

[0036] An overflow port, a fourth overflow port 701, is provided on the top of the operating oil tank 7. The fourth overflow port 701 is used to communicate with the buffer clean oil tank 5. The fourth overflow port 701 can prevent excessive operating fluid in the operating oil tank 7 from causing excessive pressure.

[0037] In addition, the oil slurry purification system further comprises a primary buffer oil tank 3, which is connected to the low-speed centrifuge 2 and is used to receive the first oil phase and heat it.

[0038] Specifically, a third heating device is provided in the first-level buffer oil tank 3, and the third heating device is a coil. A third conveying branch 13 connected to the high-speed centrifuge 4 is provided at the bottom of the first-level buffer oil tank 3. The third conveying branch 13 is provided with a fourth gear pump 1301, a third flow meter 1302, a third temperature sensor 1303 and a third electric three-way valve 1304 in sequence along the conveying direction. The third electric three-way valve 1304 has a third reflux port 1305, and the third reflux port 1305 is used to connect with the first-level buffer oil tank 3; the fourth gear pump 1301 is a 6T gear pump, which is used to convey the substance in the first buffer oil tank to the high-speed centrifuge 4.

[0039] Furthermore, a second tubular radiator 1306 is provided between the third flow meter 1302 and the third temperature sensor 1303 , and a second temperature control valve 1307 is provided at the second tubular radiator 1306 . The second temperature control valve 1307 is used to output steam, and the second temperature control valve 1307 is electrically connected to the third temperature sensor 1303 .

[0040] Specifically, the second tubular heat exchanger is used to further heat the fluid in the third delivery branch 13 to compensate for the heat loss during transportation in the third delivery branch 13. The steam volume of the second temperature control valve 1307 is controlled by the third temperature sensor 1303. The third electric three-way valve 1304 is used to return the fluid to the buffer oil tank for circulation heating when the temperature in the third delivery branch 13 does not reach the set value.

[0041] In some specific embodiments, the oil slurry purification system also includes a circulation component, which includes a buffer slag box 8 connected to the low-speed centrifuge 2 and the high-speed centrifuge 4, and a horizontal screw machine 9 connected to the buffer slag box 8, the buffer slag box 8 is used to connect the first slag phase and the second slag phase, the horizontal screw machine 9 is used to receive the contents in the buffer slag box 8 and separate the fourth oil phase and the waste slag phase, and also includes a buffer circulation oil tank 10, which is used to receive the fourth oil phase and transport it to the pretreatment box.

[0042] Specifically, the buffer slag box 8 can receive the first slag phase and the second slag phase, and transport them to the horizontal screw machine 9 for separation. The horizontal screw machine 9 can produce a fourth oil phase and a waste slag phase. The waste slag phase is output through the horizontal screw machine 9 and packaged for recycling.

[0043] Among them, a first heating device is provided in the buffer slag box 8, and a first conveying branch 11 connected to the horizontal screw machine 9 is provided at the buffer slag box 8. The first conveying branch 11 is provided with a first gear pump 1101, a first flow meter 1102, a first temperature sensor 1103 and a first electric three-way valve 1104 in sequence along the conveying direction. The first electric three-way valve 1104 has a first reflux port 1105, and the first reflux port 1105 is used to communicate with the buffer slag box 8.

[0044] Furthermore, a reflux branch 1001 is provided at the buffer circulation oil tank 10 , and the reflux branch 1001 is used to communicate with the pretreatment tank body. A second gear pump 1002 is provided at the reflux branch 1001 .

[0045] The buffer circulation oil tank 10 can transport the fourth oil phase to the pretreatment box, in which the oil slurry to be treated is stored. By inputting the fourth oil phase, the fluidity of the oil slurry to be treated can be improved to facilitate the continuous and stable operation of the oil slurry purification system.

[0046] In some specific embodiments, a first overflow port 1003 is provided on the top of the buffer circulation oil tank 10 , and the first overflow port 1003 is used to communicate with the buffer slag box 8 .

[0047] The first overflow port 1003 can overflow when the buffer circulation oil tank 10 is full, and the overflowing fourth oil phase can flush the buffer slag box 8 to avoid blockage in the buffer slag box 8.

[0048] Furthermore, a third overflow port 301 is provided on the top of the primary buffer oil tank 3 , and the third overflow port 301 is connected to the buffer slag box 8 .

[0049] The third overflow port 301 can overflow when the primary buffer oil tank 3 is full, and the overflowing first oil phase can also flush the buffer slag box 8, further improving the fluidity of the material in the buffer slag box 8.

[0050] See Figure 6 In some specific embodiments, the present application also provides an oil slurry purification method, which specifically includes the following steps: Step S1: The oil slurry to be treated is transported from the pretreatment box to the raw material tank 1, stirred and heated to 120-130° C., and transported to the low-speed centrifuge 2 for separation to obtain the first oil phase; Step S2: transporting the first oil phase to a buffer oil tank, heating it to 120-130° C., and then transporting it to a high-speed centrifuge 4 to separate and obtain a second oil phase; Step S3: transporting a portion of the second oil phase to the buffer clean oil tank 5, and transporting the rest to the oil storage tank for storage; Step S4: transporting the material in the buffer clean oil tank 5 to the operating liquid centrifuge 6 for centrifugal separation to obtain a third oil phase, which is then transported to the operating oil tank 7; Step S5: the operating oil tank 7 continuously provides the substances in the operating oil tank 7 to the low-speed centrifuge 2 and the high-speed centrifuge 4 for recycling.

[0051] Among them, the rotation speed of the low-speed centrifuge 2 is 8000 rpm, the rotation speed of the high-speed centrifuge 4 is 10000 rpm, and the rotation speed of the operating liquid centrifuge 6 is 12000 rpm.

[0052] Through practice, in the purification system using the above method, the oil slurry processing capacity is 4 m³ / h, the solid content of the treated oil slurry can be controlled within 50ppm, the oil slurry recovery rate is greater than 99%, and the solid removal rate in the oil slurry reaches more than 95%, which meets the subsequent use requirements. In addition, the system has the characteristics of intelligent and automatic operation and can operate continuously.

[0053] Working principle: When using the oil slurry purification system, the oil slurry to be treated is stored in a pretreatment box, and is input into a raw material tank 1 through an oil pump. In the raw material tank 1, the oil slurry is stirred and heated by a second heating device and a stirring device to reduce the viscosity of the oil slurry to be treated and improve its fluidity. Thereafter, the oil slurry to be treated is circulated and heated along the second conveying branch 12 and conveyed to a low-speed centrifuge 2 for separation of large-size solid particles to produce a first oil phase and a first slag phase.

[0054] Among them, the first oil phase enters the primary buffer oil tank 3, is heated by the third heating device, and then circulates and heats through the third conveying branch 13 and is conveyed to the high-speed centrifuge 4 for separation of small-size solid particles to produce a second oil phase and a second slag phase.

[0055] Furthermore, the first slag phase and the second slag phase are both transported to the buffer slag box 8, and after being heated by the first heating device in the buffer slag box 8, they are transported to the horizontal screw machine 9 for solid-liquid separation to produce a fourth oil phase and a waste slag phase. The fourth oil phase is transported to the pretreatment box for circulation, and the waste slag phase is packaged after being output by the horizontal screw machine 9 for subsequent recycling.

[0056] In addition, the second oil phase is transported to the buffer clean oil tank 5, most of the second oil phase passes through the fifth transport branch 15, is filtered by the precision filter 1502, and then transported to the oil storage tank for storage, and a small part of the second oil phase is transported to the operating liquid centrifuge 6 by the fifth gear pump 1401 through the fourth transport branch 14, and is further separated by the operating liquid centrifuge 6 to produce the third oil phase. The third oil phase is transported to the operating liquid tank for use as the operating liquid, and the operating liquid is transported to the high-speed centrifuge 4 and the low-speed centrifuge 2 respectively through the sixth transport branch 16 and the seventh transport branch 17 for consumption and circulation.

[0057] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on one or several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0058] The present invention and its implementation methods are described schematically above, and the description is not restrictive. The embodiments shown in the embodiments are only part of the implementation methods of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the embodiments and designs a structure and an implementation method similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. An oil slurry purification system, comprising a pretreatment box and a raw material tank (1) which are interconnected, wherein the pretreatment box is used to store the oil slurry to be treated, and an oil delivery pump is provided at the pretreatment box, and the oil delivery pump is used to deliver the oil slurry to be treated to the raw material tank (1), characterized in that: Also includes: A low-speed centrifuge (2) is connected to the raw material tank (1) and is used to separate large-size particles in the oil slurry to be processed to produce a first oil phase and a first slag phase; A primary buffer oil tank (3), which is in communication with the low-speed centrifuge (2) and is used to receive the first oil phase and heat it; A high-speed centrifuge (4) is connected to the primary buffer oil tank (3) and is used to separate small-size particles in the first oil phase to produce a second oil phase and a second slag phase; A buffer clean oil tank (5), which is connected to the high-speed centrifuge (4) and is used to receive the second oil phase and transport it to an oil storage tank; An operating liquid centrifuge (6), which is connected to the buffer clean oil tank (5) and is used to separate tiny particles in the second oil phase to produce a third oil phase; The operating oil tank (7) is connected to the operating liquid centrifuge (6) and is used to receive the third oil phase and transport it to the high-speed centrifuge (4) and the low-speed centrifuge (2).

2. The oil slurry purification system according to claim 1, characterized in that: It also includes a circulation component, which includes a buffer slag box (8) connected to the low-speed centrifuge (2) and the high-speed centrifuge (4), and a horizontal screw machine (9) connected to the buffer slag box (8), the buffer slag box (8) is used to receive the first slag phase and the second slag phase, and the horizontal screw machine (9) is used to receive the content in the buffer slag box (8) and separate a fourth oil phase and a waste slag phase; it also includes a buffer circulation oil tank (10) for receiving the fourth oil phase and conveying it to the pretreatment box.

3. The oil slurry purification system according to claim 2, characterized in that: A first heating device is provided in the buffer slag box (8); a first conveying branch (11) connected to the horizontal screw machine (9) is provided at the buffer slag box (8); a first gear pump (1101), a first flow meter (1102), a first temperature sensor (1103) and a first electric three-way valve (1104) are provided in sequence along the conveying direction of the first conveying branch (111); the first electric three-way valve (1104) has a first reflux port (1105); and the first reflux port (1105) is used to communicate with the buffer slag box (8).

4. The oil slurry purification system according to claim 2, characterized in that: A return branch (1001) is provided at the buffer circulation oil tank (10), the return branch (1001) is used to communicate with the pretreatment tank, and a second gear pump (1002) is provided at the return branch (1001); A first overflow port (1003) is provided at the top of the buffer circulation oil tank (10), and the first overflow port (1003) is used to communicate with the buffer slag tank (8).

5. The oil slurry purification system according to claim 1, characterized in that: A second heating device and a stirring device are provided in the raw material tank (1), and a second conveying branch (12) connected to the low-speed centrifuge (2) is provided at the bottom. The second conveying branch (12) is provided with a first duplex filter (1201), a third gear pump (1202), a second flow meter (1203), a second temperature sensor (1204) and a second electric three-way valve (1205) in sequence along the conveying direction. The second electric three-way valve (1205) has a second reflux port (1206), and the second reflux port (1206) is used for connecting to the raw material tank (1); A second overflow port (101) is provided on the top of the raw material tank (1), and the second overflow port (101) is used to communicate with the pretreatment box.

6. The oil slurry purification system according to claim 5, characterized in that: A first tubular radiator (1207) is connected between the second temperature sensor (1204) and the second electric three-way valve (1205), and a first temperature control valve (1208) is provided at the first tubular radiator (1207). The first temperature control valve (1208) is used to output steam, and the first temperature control valve (1208) is electrically connected to the second temperature sensor (1204).

7. The oil slurry purification system according to claim 2, characterized in that: A third heating device is provided in the primary buffer oil tank (3), and a third delivery branch (13) connected to the high-speed centrifuge (4) is provided at the bottom. The third delivery branch (13) is provided with a fourth gear pump (1301), a third flow meter (1302), a third temperature sensor (1303) and a third electric three-way valve (1304) in sequence along the delivery direction. The third electric three-way valve (1304) has a third reflux port (1305), and the third reflux port (1305) is used to communicate with the primary buffer oil tank (3); A third overflow port (301) is provided on the top of the primary buffer oil tank (3), and the third overflow port (301) is connected to the buffer slag tank (8).

8. The oil slurry purification system according to claim 7, characterized in that: A second tubular radiator (1306) is provided between the third flow meter (1302) and the third temperature sensor (1303), and a second temperature control valve (1307) is provided at the second tubular radiator (1306). The second temperature control valve (1307) is used to output steam, and the second temperature control valve (1307) is electrically connected to the third temperature sensor (1303).

9. The oil slurry purification system according to claim 1, characterized in that: A fourth delivery branch (14) connected to the operating fluid centrifuge (6) is provided at the buffer clean oil tank (5), and a fifth gear pump (1401) is provided on the fourth delivery branch (14); A fifth delivery branch (15) is also provided at the buffer clean oil tank (5), the fifth delivery branch (15) being connected to an oil storage tank, and a sixth gear pump (1501) and a precision filter (1502) are sequentially provided on the fifth delivery branch (15), wherein a plurality of the precision filters (1502) are connected in parallel.

10. The oil slurry purification system according to claim 1, characterized in that: A sixth delivery branch (16) connected to the low-speed centrifuge (2) and a seventh delivery branch (17) connected to the high-speed centrifuge (4) are provided at the operating oil tank (7); The sixth delivery branch (16) is provided with a seventh gear pump (1601), a second duplex filter (1602) and a first operating fluid valve group (1603) in sequence, and a fourth reflux port (1604) is provided at the low-speed centrifuge (2) correspondingly, and the fourth reflux port (1604) is used to communicate with the operating oil tank (7); An eighth gear pump (1701), a third duplex filter (1702) and a second operating fluid valve group (1703) are sequentially arranged on the seventh delivery branch (17); a fifth reflux port (1704) is correspondingly arranged at the high-speed centrifuge (4); the fifth reflux port (1704) is used to communicate with the operating oil tank (7); A fourth overflow port (701) is provided at the top of the operating oil tank (7), and the fourth overflow port (701) is used to communicate with the buffer clean oil tank (5).

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