Separating device for removing solid particles in catalytic slurry oil

Abstract

The utility model discloses a separating device for removing solid particles in catalytic slurry oil. The separating device comprises a barrel body, a hollow shaft, a filtering membrane plate, a motor, a feeding pipe, a discharging pipe and a filtrate discharging pipe A, the hollow shaft is arranged in the barrel, the upper end of the hollow shaft is fixed at the top of the barrel through a sealing piece A and extends out of the top of the barrel to be connected with the motor, the lower end of the hollow shaft is fixed at the bottom of the barrel through a sealing piece B and extends out of the bottom of the barrel, and the bottom of the barrel is connected with a filtrate discharging pipe A through a flange; a plurality of layers of filtering membrane plates are arranged on the hollow shaft in sequence and are fixed through a sealing piece C; by adopting a rotary structure of the multiple layers of filtering membrane plates and the hollow shaft, solid particulate matters can be effectively prevented from depositing on the membrane surface and blocking membrane holes, the continuous and stable operation time is long, and the backwashing is easy; the device is simple in structure, easy to operate, high in separation efficiency, good in separation precision, low in production cost and good in economic benefit.

Description

Technical Field

[0001] This utility model relates to the field of catalytic oil slurry purification and treatment technology, and more specifically to a separation device for removing solid particles from catalytic oil slurry. Background Technology

[0002] Catalytic cracking is one of the most important and widely used technologies in the refining industry. However, a certain amount of slurry oil is generated during the production process. If hydrotreated residue oil or wax oil blended with residue oil is used as raw material for catalytic cracking, the slurry oil yield is high, and the oil has a high density, high relative molecular mass, high viscosity and contains a lot of particulate catalyst, which limits its utilization. Therefore, the disposal of catalytic slurry oil has always been a long-standing problem for petrochemical companies.

[0003] Catalytic slurry oil is rich in polycyclic aromatic hydrocarbons and can be used as a raw material for the production of marine fuel, carbon black, needle coke, carbon fiber, etc. However, due to the presence of catalyst solid particles in the slurry oil, it is difficult for catalytic slurry oil to meet the raw material requirements of marine fuel, carbon black, needle coke, carbon fiber, etc. Therefore, catalytic slurry oil has not yet been widely used and has failed to realize its application value.

[0004] To improve the utilization value of catalytic oil slurry, it is essential to first remove solid particles from the slurry. Conventional methods for removing solid particles, such as sedimentation, flocculation, and centrifugation, are ineffective. In recent years, cross-flow membrane filtration has become widely used in industry. While cross-flow membrane filtration effectively removes solid particles from catalytic oil slurry with high precision and good removal efficiency, it also presents challenges. The slurry contains a large amount of colloids and asphaltenes, which have high molecular weight and viscosity, making them prone to depositing solid particles on the membrane surface. These particles are difficult to clean, leading to membrane pore blockage and decreased membrane flux. This not only severely affects filtration efficiency but also causes a rapid decline in membrane flux, necessitating frequent backwashing of the cross-flow membrane filtration system. This not only disrupts the stable operation of the unit but also poses safety risks. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a separation device for removing solid particles from catalytic oil slurry. This device can prevent solid particles from depositing on the membrane surface and slow down membrane pore blockage. The membrane flux decreases slowly, the number of backwashing cycles is reduced, the device operates stably for a long time, and the operation is simple with low safety risks.

[0006] The technical solution adopted in this utility model is:

[0007] A separation device for removing solid particles from catalytic oil slurry includes a cylinder, a hollow shaft, filter membranes, a motor, a feed pipe, a discharge pipe, and a filtrate discharge pipe A. The hollow shaft is arranged inside the cylinder, with its upper end fixed to the top of the cylinder by a seal A and extending from the top of the cylinder to connect with the motor. Its lower end is fixed to the bottom of the cylinder by a seal B and extends from the bottom of the cylinder. The bottom of the cylinder is connected to the filtrate discharge pipe A by a flange. The filter membranes are multi-layered and sequentially installed on the hollow shaft, and fixed by a seal C.

[0008] Furthermore, a circular pipe surrounds both the upper and lower parts of the cylinder, and several membrane tubes arranged in an upward and downward direction are distributed between the two circular pipes, with the lower circular pipe connected to the filtrate outlet pipe B.

[0009] The sealing element connecting the hollow shaft to the cylinder is a conventional transmission sealing element. The function of the sealing element is to fix the hollow shaft to the cylinder on the one hand, and to seal it on the other hand to prevent liquid from leaking out of the cylinder.

[0010] The motor is a variable frequency motor, which adjusts its speed according to the properties of the material.

[0011] The filter membrane plate consists of a frame and a membrane sheet. The membrane sheet is divided into upper and lower parts and is fixed to the frame with bolts.

[0012] The number of filter membranes can be determined according to the material processing volume.

[0013] The membrane can be a ceramic membrane, a metal membrane, or an organic membrane, etc.

[0014] The filter template is a whole circle, or a circle composed of two semicircles, or a circle composed of four fan-shaped parts.

[0015] The method for removing solid particulate matter from catalytic oil slurry using this invention is as follows:

[0016] The catalytic slurry is injected into the inner cavity of the cylinder through the feed pipe. An external power source starts the motor, which drives the hollow shaft to rotate. This rotation of the hollow shaft, in turn, causes several filter membrane plates to rotate. As the filter membrane plates rotate, the catalytic slurry flows turbulently within the cylinder; the faster the rotation speed, the stronger the turbulence. Due to the turbulent flow of the catalytic slurry within the cylinder, catalyst solid particles are less likely to deposit on the template and membrane tube surfaces. Simultaneously, under pressure, the catalytic slurry passes through the membrane pores into the hollow shaft and membrane tubes, flowing out from the corresponding filtrate outlet pipes. The material containing catalyst solid particles flows out from the discharge pipe.

[0017] As the filter template rotates at high speed, the catalytic slurry continuously washes the surface of the membrane plate and membrane tube, preventing catalyst particles from remaining on the surface of the membrane plate and membrane tube. This effectively prevents catalyst particles from depositing on the membrane surface and slows down membrane pore blockage, thus achieving long-term operation.

[0018] This utility model has the following beneficial effects:

[0019] (1) The multi-layer filter membrane plate and hollow shaft rotation structure can effectively prevent catalyst particles from depositing on the membrane surface and slow down membrane pore blockage. The membrane flux decreases slowly and the continuous stable operation time is long.

[0020] (2) The use of rotating multi-layer filter membrane plates makes backwashing easy, greatly reduces the amount of backwash liquid used, and significantly reduces the number of backwashing cycles.

[0021] (3) Simple structure, easy operation, low energy consumption, high separation efficiency, good separation accuracy, significantly reduced production cost, and good economic benefits. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a schematic diagram of the structure of the filter membrane plate of this utility model.

[0024] In the diagram: 1. Cylinder; 2. Hollow shaft; 3. Filter membrane plate; 4. Motor; 5. Feed pipe; 6. Discharge pipe; 7. Filtrate outlet pipe A; 8. Seal A; 9. Seal B; 10. Seal C; 11. Flange; 12. Frame; 13. Membrane; 14. Membrane tube; 15. Circular pipe; 16. Filtrate outlet pipe B; 17. Motor frame; 18. Coupling. Detailed Implementation

[0025] The specific embodiments of this utility model are described in detail below. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0026] from Figure 1As can be seen, this utility model is a liquid-solid separation device for removing catalyst particles from catalytic slurry, including a cylinder 1, a hollow shaft 2, filter membrane plates 3, a motor 4, a feed pipe 5, a discharge pipe 6, and a filtrate outlet pipe A7. The hollow shaft 2 is arranged inside the cylinder 1, with its upper end fixed to the top of the cylinder 1 by a seal A8 and extending from the top of the cylinder 1 to connect with the motor 4. The lower end of the hollow shaft 2 is fixed to the bottom of the cylinder 1 by a seal B9 and extends from the bottom of the cylinder 1. The bottom of the cylinder 1 is connected to the filtrate outlet pipe A7 by a flange 11. The hollow shaft 2 and the motor 4 are connected by conventional connectors. To increase the separation capacity and effect, a circular pipe 15 surrounds both the upper and lower parts of the cylinder 1, with several membrane tubes 14 arranged in an upward and downward direction distributed between the two circular pipes. The lower circular pipe 15 is connected to the filtrate outlet pipe B16. The filter membrane plates 3 are sequentially installed on the hollow shaft 2 and fixed by seals C10.

[0027] The sealing elements A8 and B9 connecting the hollow shaft 2 to the cylinder 1 adopt conventional transmission seals. The function of the sealing elements is to fix the hollow shaft 2 to the cylinder 1 and to seal it to prevent liquid from leaking out of the cylinder.

[0028] The motor 4 is preferably a variable frequency motor. Materials with different viscosities require different speeds. The variable frequency motor can adjust the speed according to the properties of the material, thereby controlling the speed of the hollow shaft and achieving a better solid-liquid separation effect.

[0029] The filter membrane plate 3 is composed of a frame 12 and a membrane 13. The membrane 13 is divided into upper and lower parts and is fixed to the frame 12 by bolts. The filter template 3 is a whole circle, or a circle composed of two semicircles, or a circle composed of four fan-shaped parts.

[0030] The number of filter membrane plates 3 can be determined according to the material processing volume.

[0031] The membrane 13 can be a ceramic membrane, a metal membrane, or an organic membrane, etc.

[0032] The method for removing solid particles from catalytic slurry using this invention involves injecting the catalytic slurry into the inner cavity of the cylinder 1 via the feed pipe 5. An external power source starts the motor 4, which drives the hollow shaft 2 to rotate. The rotation of the hollow shaft 2 causes several filter membrane plates 3 to rotate. The catalytic slurry moves within the cylinder along with the rotation of the filter membrane plates 3. Under pressure, the catalytic slurry passes through the membrane pores and enters the hollow shaft 2 and membrane tube 14, flowing out from the filtrate outlet pipe A7 and filtrate outlet pipe B16 respectively. Material containing catalyst particles flows out from the discharge pipe 6.

[0033] The liquid-solid separation device using the structure of this utility model can effectively remove solid particles from the catalyst slurry, thereby obtaining a catalyst slurry with low solid particle content, which meets the application requirements of catalyst slurry in high-end fields.

[0034] The liquid-solid separation device of this invention can also be used for liquid-solid separation of other materials with large molecular weight or high viscosity.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A separation device for removing solid particles from catalytic oil slurry, characterized in that: It includes a cylinder, a hollow shaft, filter membrane plates, a motor, a feed pipe, a discharge pipe, and a filtrate discharge pipe A; the hollow shaft is arranged inside the cylinder, with its upper end fixed to the top of the cylinder by a seal A and extending from the top of the cylinder to connect with the motor, and its lower end fixed to the bottom of the cylinder by a seal B and extending from the bottom of the cylinder, with the bottom of the cylinder connected to the filtrate discharge pipe A by a flange; the filter membrane plates are multi-layered, sequentially installed on the hollow shaft, and fixed by a seal C.

2. The separation device for removing solid particles from catalytic oil slurry according to claim 1, characterized in that: The upper and lower parts of the cylinder are surrounded by a circular pipe, and several membrane tubes are distributed between the two circular pipes in an upward and downward direction. The lower circular pipe is connected to the filtrate outlet pipe B.

3. The separation device for removing solid particles from catalytic oil slurry according to claim 1, characterized in that: The filter membrane plate consists of a frame and a membrane sheet. The membrane sheet is divided into upper and lower parts and is fixed to the frame with bolts.

4. The separation device for removing solid particles from catalytic oil slurry according to claim 3, characterized in that: The membrane is a ceramic membrane, a metal membrane, or an organic membrane.

5. The separation device for removing solid particles from catalytic oil slurry according to claim 1, characterized in that: The motor is a variable frequency motor, which adjusts its speed according to the properties of the material.

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