Device and system for treating discharged catalyst of fluidized bed reactor

Abstract

The invention discloses fluidized bed reactor discharged catalyst treatment equipment and a fluidized bed reactor discharged catalyst treatment system. The fluidized bed reactor discharged catalyst treatment equipment comprises a tank body, and a centrifugal coupling filtering unit and a conical filtering unit which are sequentially arranged in the tank body from top to bottom, the centrifugal coupling filtering unit consists of a plurality of filtering pipes which are connected in parallel; each filtering pipe is sequentially provided with a rotational flow concentration section and a centrifugal filtering section from top to bottom; the conical filter unit comprises a conical filter screen of which the upper end is equal to the inner wall of the tank body in diameter, and a conical bottom support which is fixedly connected with the lower end of the conical filter screen. According to the equipment, rotational flow concentration and centrifugal filtration are combined through the centrifugal coupling filtration unit, preliminary deoiling concentration is performed through the rotational flow concentration section before centrifugal filtration, the load of the centrifugal filtration section can be reduced, the treatment capacity and the treatment precision of the equipment are improved, deoiling recovery of an oil-containing catalyst can be realized only through single static equipment, and the cost is reduced. The operation cost is low, the continuous operation period is long, and the safety is high.

Description

Technical Field

[0001] The present invention belongs to the field of treatment of discharged catalysts from petrochemical reactors, and particularly relates to a device and a system for treating discharged catalysts from a fluidized bed reactor. Background Art

[0002] With the continuous development of petrochemical industry, the output of high-quality crude oil shows a continuous downward trend. The overall direction of the hydrogenation process begins to develop towards more inferior oil products. In order to ensure a wider raw material adaptability, the fluidized bed reactor hydrogenation technology has emerged. The biggest advantage of the fluidized bed reactor hydrogenation technology is its ability to load and unload catalysts online. The online addition and discharge of catalysts are important measures to ensure the stable product quality, avoiding the problem of frequent shutdowns for catalyst replacement in fixed bed reactors and greatly extending the operation cycle of the unit.

[0003] Since the catalyst used in the fluidized bed reactor is boiling rapidly with the oil and gas in the reactor and is relatively evenly dispersed, the catalyst discharged daily has a high activity. The catalyst has a high cost due to the presence of a certain amount of active metal, and the daily online replacement of the catalyst results in a large discharge amount. Therefore, it is particularly important to regenerate the discharged catalyst outside the reactor, and it has great economic significance.

[0004] Generally, the catalyst in a hydrogenation reactor can be directly regenerated after reducing the oil content therein through hot hydrogen stripping or hot nitrogen stripping during the shutdown process. However, the waste catalyst discharged online from the fluidized bed reactor is in a slurry state, and the catalyst is discharged from the reactor mixed with the reaction materials without going through the processes of hot hydrogen stripping and hot nitrogen stripping, and the oil content is very high. If the high-oil-content catalyst is directly regenerated by the traditional coking regeneration method, there is likely to be a violent combustion of oil and gas, resulting in catalyst fragmentation or deactivation. At the same time, the waste gas generated by combustion is highly harmful to the environment and organisms. Using a filter screen to remove oil from the catalyst is an effective and economical physical separation method. However, traditional filters have low catalytic particle deoiling efficiency, and are prone to precipitation, accumulation and fouling on the filter element, clogging valves and mesh holes, and corroding metals, seriously affecting the operation safety and efficiency of the filter.

[0005] CN113122318A discloses a fluidized bed hydrogenation reaction system and a hydrogenation method, which use two stripping tanks as the waste catalyst treatment unit and embed the waste catalyst treatment unit in the hydrogenation reaction system. This method has a simple process, good cleaning effect, and low oil content of the obtained waste catalyst. However, the stripping equipment relies on the high temperature of the first gas-phase material in the hot high-pressure separator to vaporize the oil phase entrained by the waste catalyst, so as to remove oil from the waste catalyst. This method has a long operation time, low efficiency, large heat loss, and the temperature of the waste catalyst after deoiling is relatively high. Therefore, there is a lack of rapid cooling treatment measures;

[0006] CN105498860A discloses a method for removing oil from waste catalysts. First, the waste catalysts are crushed to a particle size less than 1000 microns, and the waste catalysts are washed with water added with NaOH and surfactant and then subjected to solid-liquid separation. This method can remove oil thoroughly, but the catalysts lose their value for reuse after being crushed and are only suitable for treating waste catalysts that do not need to be regenerated for use;

[0007] CN202447098U discloses a catalyst oil removal device, including an oil removal tank, a gas-liquid separator, a circulating nitrogen compressor, an oil-gas water cooler, a circulating nitrogen heater, an oil-nitrogen heat exchanger, a liquid separation tank at the compressor inlet, and a waste oil collection tank, etc. The catalyst is intercepted in the oil removal tank by the filter element in the oil removal tank, and the oil phase remaining in the oil removal tank is vaporized by hot nitrogen. The oil-nitrogen mixed gas is de-liquefied after heat exchange and cooling. At the same time, a nitrogen pressurization circulation system and a detection unit are provided. This method has a high oil removal efficiency, but the system is relatively complex. The oil remaining on the catalyst after being intercepted by the filter element is vaporized by heating with hot nitrogen, so the operating cost is relatively high;

[0008] CN103920541A discloses a fluidized bed hydrotreating catalyst oil removal system and method thereof, including a catalyst oil removal unit, an oil-gas separation unit, and a gas post-treatment unit. The catalyst oil removal unit relies on circulating gas to remove the oil phase in the catalyst. In this method, the circulating gas passes through the catalyst layer from top to bottom, with a relatively high pressure drop and a long time required to reach the required oil removal rate.

[0009] CN208406314U discloses a new type of catalyst filter for recovering catalysts in chemical production, including a primary filter layer, a screening column, a precision filter disc, and a high-frequency micro-vibration cavity column structure. This filter performs multi-stage filtration on the catalyst with a high filtration accuracy, but the attached oil remaining on the catalyst cannot be efficiently removed, and the inside of the precision filter disc with a cavity network structure separation is prone to catalyst blockage problems.

[0010] CN102527448A discloses a catalyst oil removal device and an oil removal method. This device mainly uses hot nitrogen to heat and remove oil from the oil-containing catalyst, and the catalyst particles are intercepted and recovered by the filter element. It includes an oil removal tank, a gas-liquid separator, an oil-gas pipeline, a circulating nitrogen compressor, a nitrogen pipeline, an oil-gas water cooler, a circulating nitrogen heater, and an oil-gas-nitrogen heat exchanger. The nitrogen escaping from the gas-liquid separator is boosted by the circulating nitrogen compressor and then transported to the oil removal tank after heat exchange in the oil-gas-nitrogen heat exchanger and heating in the circulating nitrogen heater. However, the stripping process of the device and method of this invention is complex, with risks such as high energy consumption and pipeline leakage.

[0011] CN213172500U discloses a wet recovery device for oil-containing waste catalysts, which uses the relative high-speed movement of the electrolyte and the electrode to carry out an electrochemical reaction to catalytically electrolyze and separate the oil-containing waste catalysts; there is an obvious polarization difference between the oil substances on the surface of the waste catalysts and the electrolyte, and they will gradually be displaced from the surface of the waste catalysts. By setting up a filtering device, the recovery of the catalysts after oil removal is realized. However, this electrolytic recovery catalyst device has problems such as a large amount of impurities in the electrolytically recovered catalysts, generation of harmful gases, and high personal safety risks. Summary of the Invention

[0012] To overcome the problems of high operating costs and low efficiency of the existing boiling bed discharged catalyst treatment equipment, the present invention provides a boiling bed reactor discharged catalyst treatment equipment and system that is structurally compact, operates reliably, and can efficiently and deeply remove the oil phase in the catalysts.

[0013] The technical solution adopted by the present invention is as follows:

[0014] In the first aspect of the present invention, there is provided a boiling bed reactor discharged catalyst treatment equipment, which is characterized in that it includes a tank body, and a centrifugal coupling filtration unit and a conical filtration unit sequentially arranged from top to bottom inside the tank body; a catalyst inlet and a first oil phase outlet are provided at the upper section of the tank body, a second oil phase outlet is provided at the middle section thereof, and a catalyst outlet, a cooling oil inlet and a cooling oil outlet are provided at the bottom thereof;

[0015] The centrifugal coupling filtration unit is composed of a plurality of parallel filtration tubes, and the filtration tubes are sequentially a swirl concentration section and a centrifugal filtration section from top to bottom; the swirl concentration section includes a cylindrical section with an open lower end, and a tangential inlet and an overflow port respectively arranged at the upper end and the top of the cylindrical section; the tangential inlet and the overflow port are respectively communicated with the catalyst inlet and the first oil phase outlet on the tank body;

[0016] The centrifugal filtration section sequentially includes a cylindrical inner layer filter screen, a spiral blade, a cylindrical outer layer filter screen and a sleeve from inside to outside, and an inner layer support ring and an outer layer support ring with the same diameter as them respectively arranged at the bottoms of the inner layer filter screen and the outer layer filter screen; the bottom of the inner layer support ring is sealed to form an inner layer oil collection area, and the outer layer support ring and the sleeve form an outer layer oil collection area sealed at the bottom; the centrifugal filtration section further includes an oil phase pipeline communicating the inner layer oil collection area and the outer layer oil collection area, and the oil phase pipeline is communicated with the second oil phase outlet on the tank body; the upper end of the outer layer filter screen of the centrifugal filtration section is fixedly connected with the lower end of the cylindrical section of the swirl concentration section;

[0017] The conical filtration unit includes a conical filter screen with the same diameter as the inner wall of the tank body at the upper end, and a conical bottom support fixedly connected with the lower end of the conical filter screen, and the bottom outlet of the conical bottom support is communicated with the catalyst outlet on the tank body.

[0018] According to an embodiment of the present invention, the conical filter screen is formed by splicing a plurality of filter plates fixed with bolts; the conical angle β of the conical filter screen is 35° to 75°.

[0019] According to an embodiment of the present invention, the left and right sides of the spiral blade are respectively fixedly connected to the inner filter screen and the outer filter screen, and are at the same height as the two; the spiral angle γ of the spiral blade is 35° to 65°; the angle α between the tangential inlet of the cyclone concentration section and the axis of the cyclone concentration section is 35° to 90°.

[0020] According to an embodiment of the present invention, the external catalyst treatment equipment for the fluidized bed reactor further includes a measurement unit, and the measurement unit includes a support and weighing unit and a density measurement port located in the middle section of the tank body, as well as a first liquid level measurement port located in the upper section of the tank body, a second liquid level measurement port and a third liquid level measurement port located in the lower section of the tank body.

[0021] According to an embodiment of the present invention, a nitrogen pressure stabilizing port is further provided at the top of the tank body, and it is externally connected to a nitrogen tank; a cone cap is further provided at the top of the inner filter screen.

[0022] According to an embodiment of the present invention, the angle α between the tangential inlet of the cyclone concentration section and the axis of the cyclone concentration section is 35° to 90°.

[0023] According to an embodiment of the present invention, the inner filter screen and the outer filter screen are wedge-shaped nets, and the mesh aperture of the inner filter screen and the outer filter screen is 100 to 500 microns.

[0024] The second aspect of the present invention lies in providing a treatment system for the external catalyst of a fluidized bed reactor, and the treatment system includes a fluidized bed reactor, a catalyst external discharge tank, an external catalyst treatment equipment for the fluidized bed reactor, and a catalyst discharge hopper connected in sequence.

[0025] According to an embodiment of the present invention, when the oil-containing catalyst material from the fluidized bed reactor is a non-uniform solid-liquid material, the treatment system further includes a hydraulic stirring buffer tank, and a hydraulic stirrer provided at the bottom of the catalyst external discharge tank, and the inlet and outlet of the hydraulic stirring buffer tank are respectively connected to the middle part of the catalyst external discharge tank and the hydraulic stirrer at the bottom of the tank through pipelines.

[0026] The third aspect of the present invention lies in providing a treatment method using the above-mentioned treatment system for the external catalyst of a fluidized bed reactor, including the following steps:

[0027] (1) Swirl concentration: The oil-containing catalyst material discharged from the fluidized bed reactor first enters the catalyst discharge tank for buffering. Then, the uniformly mixed oil-containing catalyst material in the catalyst discharge tank enters the tank through the catalyst inlet of the tank body of the fluidized bed reactor external catalyst treatment equipment, and enters the swirl concentration section through the tangential inlet. The oil-containing catalyst material rotates at a high speed in the swirl concentration section for oil removal and concentration. The separated oil phase is discharged from the first oil phase outlet on the tank body through the overflow port at the top of the swirl concentration section;

[0028] (2) Centrifugal filtration: The oil-containing catalyst after preliminary oil removal and concentration enters between the inner filter screen and the outer filter screen of the centrifugal filtration section, and performs spiral centrifugal separation along the spiral blades while carrying out deep filtration for oil removal. The separated oil phase penetrates through the inner filter screen and the outer filter screen and converges in the inner oil collection area and the outer oil collection area, and is discharged from the second oil phase outlet through the oil phase pipeline;

[0029] (3) Cooling and discharging: Cooling diesel is input into the tank from the cooling oil inlet of the tank body. The oil-containing catalyst processed by the centrifugal coupling filtration unit is static in the cooling diesel to cool down; the catalyst and the cooling diesel are separated through the conical filtration unit. The separated catalyst is discharged from the catalyst outlet and transported to the catalyst discharge hopper; the separated cooling diesel is discharged from the cooling oil outlet and recycled to the dirty recovered oil filter.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. The fluidized bed reactor external catalyst treatment equipment of the present invention combines swirl concentration and centrifugal filtration through the centrifugal coupling filtration unit, so the equipment structure is more compact, the floor area is small, and the operation is safer and more reliable.

[0032] 2. The present invention first performs preliminary oil removal and concentration through the swirl concentration section before centrifugal filtration, which can reduce the load of the centrifugal filtration section and improve the processing capacity and processing accuracy of the equipment.

[0033] 3. The penetration direction of the conical filter screen in the conical filtration unit of the present invention is perpendicular to the material flow direction, effectively avoiding the problem of filter screen blockage and extending the service life of the equipment.

[0034] 4. The fluidized bed reactor external catalyst treatment equipment of the present invention can realize the oil removal and recovery of the oil-containing catalyst only through a single static equipment, without the participation of equipment such as compressors, heat exchangers, and gas circulation treatment. It has low operating costs, a long continuous operation cycle, and high safety.

[0035] 5. The fluidized bed reactor external catalyst treatment system of the present invention can perform safe and long-term treatment, has the characteristics of being simple, reliable, safe, environmentally friendly, and highly automated, can meet the high-efficiency and safe treatment requirements of the fluidized bed reactor external catalyst, and has great application value. Description of the Drawings

[0036] Figure 1 It is a schematic structural diagram of the equipment for treating the catalyst discharged from the fluidized bed reactor.

[0037] Figure 2 It is a schematic structural diagram of the centrifugal coupling filtration unit.

[0038] Figure 3 It is a three-dimensional structural diagram of the centrifugal coupling filtration unit.

[0039] Figure 4 It is a three-dimensional structural diagram of the swirl concentration section in the centrifugal coupling filtration unit.

[0040] Figure 5 It is a sectional view along the axis of the oil phase pipeline at the bottom of the centrifugal filtration section.

[0041] Figure 6A and Figure 6B are respectively the top view and the side view of the three-dimensional structure at the bottom of the centrifugal filtration section.

[0042] Figure 7A and Figure 7B are respectively the top view and the side view of the conical filter mesh in the conical filtration unit.

[0043] Figure 8A and Figure 8B are respectively the top view and the side view of the three-dimensional structure of the centrifugal filtration section.

[0044] Figure 9 It is a schematic flow diagram of the catalyst treatment system for the fluidized bed reactor of the present invention.

[0045] Figure 10 It is a schematic flow diagram of the catalyst treatment system for the fluidized bed reactor of the present invention (excluding the hydraulic stirrer and the hydraulic stirring buffer tank).

[0046] Figure 11 It is a schematic diagram of the connection relationship between the catalyst discharge tank and the hydraulic stirring buffer tank.

[0047] In the figure: 1 - tank body; 101 - catalyst inlet; 102 - first oil phase outlet; 103 - second oil phase outlet; 104 - catalyst outlet; 105 - cooling oil outlet; 106 - cooling oil inlet; 107 - support and weighing unit; 108 - density measurement port; 109 - first liquid level measurement port; 110 - second liquid level measurement port; 111 - third liquid level measurement port; 112 - nitrogen pressure stabilizing port;

[0048] 2 - Centrifugal coupling filtration unit; 21 - Cyclone concentration section; 22 - Centrifugal filtration section; 23 - Filter tube; 211 - Tangential inlet; 212 - Overflow port; 213 - Cylindrical section; 221 - Inner filter screen; 222 - Spiral blade; 223 - Outer filter screen; 224 - Sleeve; 225 - Inner support ring; 226 - Outer support ring; 227 - Oil phase pipeline; 228 - Cone cap;

[0049] 3 - Conical filtration unit; 301 - Conical filter screen; 302 - Conical bottom support; 303 - Filter plate; 304 - Bolt;

[0050] 4 - Fluidized bed reactor; 5 - Catalyst discharge tank; 51 - Hydraulic agitator; 52 - Hydraulic agitation buffer tank; 6 - Equipment for treating discharged catalyst from fluidized bed reactor; 7 - Catalyst discharge hopper; 8 - Pressure control system. Detailed implementation manners

[0051] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings through specific embodiments. It should be understood that the following embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of the present invention.

[0052] Embodiment 1. An equipment for treating discharged catalyst from fluidized bed reactor

[0053] As Figure 1 and Figure 2 shown, the equipment for treating discharged catalyst from fluidized bed reactor includes a tank body 1, and a centrifugal coupling filtration unit 2 and a conical filtration unit 3 which are sequentially arranged from top to bottom inside the tank body;

[0054] The upper section of the tank body 1 is provided with a catalyst inlet 101 and a first oil phase outlet 102, the middle section thereof is provided with a second oil phase outlet 103, and the bottom thereof is provided with a catalyst outlet 104, a cooling oil outlet 105 and a cooling oil inlet 106;

[0055] Combined with Figure 3 shown, the centrifugal coupling filtration unit 2 is composed of a plurality of parallel filter tubes 23, and the filter tubes 23 are sequentially a cyclone concentration section 21 and a centrifugal filtration section 22 from top to bottom; Combined with Figure 4 shown, the cyclone concentration section 21 includes a cylindrical section 213 with an open lower end, and a tangential inlet 211 and an overflow port 212 which are respectively arranged at the upper end and the top of the cylindrical section 213; The tangential inlet 211 and the overflow port 212 are respectively communicated with the catalyst inlet 101 and the first oil phase outlet 102 on the tank body 1 (as Figure 1 shown).

[0056] Combined with Figure 5As shown, the centrifugal filtration section 22 from the inside to the outside is successively a cylindrical inner filter net 221, a spiral blade 222, a cylindrical outer filter net 223 and a sleeve 224, and an inner support ring 225 and an outer support ring 226 which are respectively arranged at the bottom of the inner filter net 221 and the outer filter net 223 and have the same diameter as them; the bottom of the inner support ring 225 is sealed to form an inner oil collection area, and the outer support ring 226 and the sleeve 224 form a bottom-sealed outer oil collection area; combined with Figure 6A and Figure 6B As shown, the centrifugal filtration section 22 further includes an oil-phase pipeline 227 communicating the inner oil collection area and the outer oil collection area; the oil-phase pipeline 227 communicates with the second oil-phase outlet 103 of the tank body 1;

[0057] The upper end of the outer filter net 223 of the centrifugal filtration section 22 is fixedly connected to the lower end of the cylindrical section 213 of the cyclone concentration section 21;

[0058] The conical filtration unit 3 includes a conical filter net 301 with the same diameter as the inner wall of the tank body 1 at the upper end, and a conical bottom support 302 fixedly connected to the lower end of the conical filter net 301, and the bottom outlet of the conical bottom support 302 communicates with the catalyst outlet 104 of the tank body 1.

[0059] Furthermore, combined with Figure 7A and Figure 7B As shown, the conical filter net 301 is fixedly spliced by a plurality of filter plates 303 through bolts 304; the conical angle β of the conical filter net 301 is 35° to 75°, and the use of the conical filter net 301 can effectively avoid the deposition of the catalyst in the tank, and at the same time is convenient for the unloading and loading of the catalyst after oil removal, improving the processing efficiency.

[0060] Furthermore, combined with Figure 8A and Figure 8B As shown, the left and right sides of the spiral blade 222 are respectively fixedly connected to the inner filter net 221 and the outer filter net 223, and are at the same height as the two; the spiral angle γ of the spiral blade 222 is 35° to 65°.

[0061] Furthermore, a cone cap 228 (as shown in Figure 2 ) is further arranged at the top of the inner filter net 221 to guide the oil-containing catalyst material from the cyclone concentration section 21 to enter between the inner filter net 221 and the outer filter net 223 for spiral centrifugal separation.

[0062] Furthermore, as shown in Figure 1As shown, the external discharged catalyst treatment equipment of the fluidized bed reactor further includes a measurement unit. The measurement unit includes a support and weighing unit 107 and a density measurement port 108 located in the middle section of the tank body 1. The support and weighing unit 107 is used to detect the weight of the catalyst in the tank, facilitating unloading and loading. The density measurement port 108 is used to detect the material height in the tank body. And a first liquid level measurement port 109 located in the upper section of the tank body 1, a second liquid level measurement port 110 and a third liquid level measurement port 111 located in the lower section, which are used to detect the cooling oil liquid level in the tank.

[0063] Further, a nitrogen pressure stabilizing port 112 is also provided at the top of the tank body 1, which is externally connected to a nitrogen tank (not shown in the figure) to maintain the stability of the pressure in the tank.

[0064] Further, as Figure 2 shown, the included angle α between the tangential inlet 211 of the cyclone concentration section 21 and the axis of the cyclone concentration section 21 is 35° - 90°.

[0065] Further, the inner filter screen 221 and the outer filter screen 223 are wedge-shaped meshes. The mesh aperture of the inner filter screen 221 and the outer filter screen 223 can be adjusted according to the particle size of the oil-containing catalyst to be treated. Preferably, the mesh aperture of the inner filter screen 221 and the outer filter screen 223 is 100 - 500 microns, which is suitable for treating catalysts with a particle size of 500 - 1000 microns.

[0066] Example 2. A fluidized bed reactor external discharged catalyst treatment system

[0067] The fluidized bed reactor external discharged catalyst treatment system adopting the fluidized bed reactor external discharged catalyst treatment equipment described in the above Example 1 is as Figure 9 shown, including a fluidized bed reactor 4, a catalyst external discharge tank 5, a fluidized bed reactor external discharged catalyst treatment equipment 6 and a catalyst unloading hopper 7 connected in sequence.

[0068] Further, as Figure 10 shown, when the oil-containing catalyst material from the fluidized bed reactor 4 is a non-uniform solid-liquid material, the treatment system further includes a hydraulic stirring buffer tank 52 and a hydraulic stirrer 51 arranged at the bottom of the catalyst external discharge tank 5. The inlet and outlet of the hydraulic stirring buffer tank 52 are respectively connected to the middle part of the catalyst external discharge tank 5 and the hydraulic stirrer 51 at the bottom of the tank through pipelines. The top of the hydraulic stirring buffer tank 52 is communicated with the top of the catalyst external discharge tank 5 through a pipeline to balance the pressure in the tank.

[0069] Combined with Figure 11As shown, part of the material in the catalyst discharge tank 5 is transported to the hydraulic agitation buffer tank 52, and then pumped from the hydraulic agitation buffer tank 52 to the hydraulic agitator 51 at the bottom of the catalyst discharge tank 5. The material in the tank is jet agitated by the hydraulic agitator 51 to make the solid-liquid material in the tank mix evenly without deposition.

[0070] Furthermore, a pressure control system 8 is provided at the tops of the catalyst discharge tank 5 and the fluidized bed discharged catalyst treatment equipment 6 to maintain the stability of the pressure in the tank.

[0071] Example 3: A method for treating discharged catalyst

[0072] Adopt the treatment method of the fluidized bed reactor discharged catalyst treatment system described in Example 2, including the following steps:

[0073] (1) Cyclone concentration: The oil-containing catalyst material discharged from the fluidized bed reactor 4 first enters the catalyst discharge tank 5 for buffering. Then, the evenly mixed oil-containing catalyst material in the catalyst discharge tank 5 enters the tank through the catalyst inlet 101 of the tank body 1 of the fluidized bed reactor discharged catalyst treatment equipment 6, and enters the cyclone concentration section 21 through the tangential inlet 211. The oil-containing catalyst material rotates at a high speed in the cyclone concentration section 21 for oil removal and concentration. The separated oil phase is discharged from the first oil phase outlet 102 on the tank body 1 through the overflow port 212 at the top of the cyclone concentration section 21;

[0074] (2) Centrifugal filtration: The oil-containing catalyst after preliminary oil removal and concentration enters between the inner filter screen 221 and the outer filter screen 223 of the centrifugal filtration section 22, and performs spiral centrifugal separation along the spiral blade 222 while performing deep filtration for oil removal. The separated oil phase penetrates the inner filter screen 221 and the outer filter screen 223 and converges in the inner oil collection area and the outer oil collection area, and is discharged from the second oil phase outlet 103 through the oil phase pipeline 227;

[0075] (3) Cooling and discharging: Cooling diesel is input into the tank from the cooling oil inlet 106 of the tank body 1. The oil-containing catalyst after being treated by the centrifugal coupling filtration unit 2 stands in the cooling diesel for 4 - 12 hours to cool down; The catalyst and the cooling diesel are separated by the conical filtration unit 3. The separated catalyst is discharged from the catalyst outlet 104 and transported to the catalyst discharge hopper 7; The separated cooling diesel is discharged from the cooling oil outlet 105 and recycled to the dirty recovered oil filter (not shown in the figure).

[0076] Furthermore, the oil content of the catalyst after cyclone concentration is less than 25 wt%, and the oil content of the catalyst after centrifugal filtration treatment is less than 15 wt%; The temperature of the catalyst after cooling is not higher than 50 °C; The operating pressure of the fluidized bed reactor discharged catalyst treatment equipment 6 is not greater than 0.3 MPa

[0077] Application Example:

[0078] During the catalyst discharging process of the ebullated bed reactor in a certain petrochemical refinery's residue hydrotreating unit, raw oil was used as the conveying oil for catalyst discharging. When the catalyst was transported from the catalyst discharge tank to the catalyst cooling tank, due to the high temperature and incomplete removal of the raw oil, the catalyst agglomerated after cooling, and it was impossible to smoothly discharge the catalyst to the catalyst loading tank. Therefore, it was necessary to perform in-depth oil removal treatment before the catalyst was cooled.

[0079] The ebullated bed external catalyst treatment equipment described in Example 1 was used to replace the conventional catalyst cooling tank to perform in-depth oil removal treatment on the oil-containing catalyst. After the oil removal treatment, the oil content in the catalyst was reduced from more than 35 wt% to less than 15 wt%, reducing the cooling time required and improving the efficiency of the external catalyst discharge treatment.

[0080] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An external discharged catalyst treatment device for a fluidized bed reactor, characterized in that It includes a tank body, and a centrifugal coupling filtration unit and a conical filtration unit which are arranged in sequence from top to bottom inside the tank body; a catalyst inlet and a first oil phase outlet are provided at the upper section of the tank body, a second oil phase outlet is provided at the middle section thereof, and a catalyst outlet, a cooling oil inlet and a cooling oil outlet are provided at the bottom thereof; The centrifugal coupling filtration unit is composed of a number of parallel filtration tubes, and the filtration tubes are successively a swirl concentration section and a centrifugal filtration section from top to bottom; the swirl concentration section includes a cylindrical section with an open bottom end, and a tangential inlet and an overflow port which are respectively arranged at the upper end and the top of the cylindrical section; the tangential inlet and the overflow port are respectively communicated with the catalyst inlet and the first oil phase outlet on the tank body; The centrifugal filtration section is successively a cylindrical inner filter screen, a spiral blade, a cylindrical outer filter screen and a sleeve from inside to outside, and an inner support ring and an outer support ring with the same diameter as them are respectively arranged at the bottoms of the inner filter screen and the outer filter screen; the bottom of the inner support ring is sealed to form an inner oil collecting area, and the outer support ring and the sleeve form an outer oil collecting area sealed at the bottom; the centrifugal filtration section further includes an oil phase pipeline communicating the inner oil collecting area and the outer oil collecting area, and the oil phase pipeline is communicated with the second oil phase outlet of the tank body; the upper end of the outer filter screen of the centrifugal filtration section is fixedly connected with the lower end of the cylindrical section of the swirl concentration section; The conical filtration unit includes a conical filter screen with the same diameter as the inner wall of the tank body at the upper end, and a conical bottom support fixedly connected with the lower end of the conical filter screen, and the bottom outlet of the conical bottom support is communicated with the catalyst outlet of the tank body.

2. The catalyst discharging treatment equipment for a fluidized bed reactor according to claim 1, wherein The conical filter screen is fixedly spliced by a number of filter plates through bolts; the conical angle β of the conical filter screen is 35° - 75°.

3. The catalyst discharging treatment equipment for a fluidized bed reactor according to claim 1, characterized in that, The left and right sides of the spiral blade are respectively fixedly connected to the inner filter screen and the outer filter screen, and are at the same height as them; the spiral angle γ of the spiral blade is 35° - 65°; the angle α between the tangential inlet of the swirl concentration section and the axis of the swirl concentration section is 35° - 90°.

4. The catalyst discharge treatment equipment for a fluidized bed reactor according to claim 1, characterized in that, The external discharged catalyst treatment equipment of the fluidized bed reactor further includes a measurement unit, and the measurement unit includes a support and weighing unit and a density measurement port located in the middle section of the tank body, and a first liquid level measurement port located in the upper section of the tank body, a second liquid level measurement port and a third liquid level measurement port located in the lower section of the tank body respectively.

5. The catalyst treatment equipment for discharging outside the fluidized bed reactor according to claim 1, wherein, A nitrogen pressure stabilizing port is further provided at the top of the tank body, and it is externally connected to a nitrogen tank; a cone cap is further arranged at the top of the inner filter screen.

6. The catalyst discharge treatment equipment for a fluidized bed reactor according to claim 1, wherein The angle α between the tangential inlet of the swirl concentration section and the axis of the swirl concentration section is 35° - 90°.

7. The catalyst discharge treatment equipment for a fluidized bed reactor according to claim 1, characterized in that The inner filter screen and the outer filter screen are wedge-shaped nets, and the mesh aperture of the inner filter screen and the outer filter screen is 100 - 500 microns.

8. A fluidized bed reactor discharged catalyst treatment system for a fluidized bed reactor discharged catalyst treatment device according to any one of claims 1-7, characterized in that The treatment system includes a fluidized bed reactor, a catalyst external discharge tank, an external discharged catalyst treatment equipment of the fluidized bed reactor and a catalyst discharging hopper which are connected in sequence.

9. The catalyst discharge treatment system for the fluidized bed reactor according to claim 8, characterized in that, When the oil-containing catalyst material from the fluidized bed reactor is a non-uniform solid-liquid material, the treatment system further includes a hydraulic agitation buffer tank and a hydraulic agitator provided at the bottom of the catalyst discharge tank. The inlet and outlet of the hydraulic agitation buffer tank are respectively connected to the middle of the catalyst discharge tank and the hydraulic agitator at the bottom of the tank through pipelines.

10. A treatment method using the treatment system for the externally discharged catalyst of the fluidized bed reactor according to any one of claims 1-9, characterized in that, It includes the following steps: (1) Cyclone concentration: The oil-containing catalyst material discharged from the fluidized bed reactor first enters the catalyst discharge tank for buffering. Then, the uniformly mixed oil-containing catalyst material in the catalyst discharge tank enters the tank through the catalyst inlet of the tank body of the fluidized bed reactor external discharge catalyst treatment equipment and enters the cyclone concentration section through the tangential inlet. The oil-containing catalyst material rotates at a high speed in the cyclone concentration section for oil removal and concentration. The separated oil phase is discharged from the first oil phase outlet on the tank body through the overflow port at the top of the cyclone concentration section. (2) Centrifugal filtration: The oil-containing catalyst after preliminary oil removal and concentration enters between the inner filter screen and the outer filter screen of the centrifugal filtration section and performs spiral centrifugal separation along the spiral blades while undergoing deep filtration for oil removal. The separated oil phase penetrates the inner filter screen and the outer filter screen and converges in the inner oil collection area and the outer oil collection area, and is discharged from the second oil phase outlet through the oil phase pipeline. (3) Cooling and discharging: Cooling diesel is input into the tank from the cooling oil inlet of the tank body. The oil-containing catalyst treated by the centrifugal coupling filtration unit is left standing in the cooling diesel for cooling and temperature reduction. The catalyst and the cooling diesel are separated by the conical filtration unit. The separated catalyst is discharged from the catalyst outlet and transported to the catalyst discharge hopper. The separated cooling diesel is discharged from the cooling oil outlet and recovered to the dirty recovered oil filter.

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