Dry cooling cycle continuous reformer on-line catalyst replacement system

Abstract

The utility model provides a dry cold circulation continuous reforming device on -line agent replacement system, including dry cold circulation continuous reforming device and on -line agent replacement system, on -line agent replacement system connects on dry cold circulation continuous reforming device, dry cold circulation continuous reforming device includes first reactor, second reactor, third reactor, fourth reactor and regenerator, forms circulation loop, the lower part of regenerator sets regenerator lower section hopper and elevator in proper order, on -line agent replacement system includes temporary feeding pipeline and temporary discharge pipeline, set up temporary agent hopper on temporary feeding pipeline, the top of temporary agent hopper is connected nitrogen gas supplement and discharge pipeline, can realize the device on -line to complete the replacement catalyst without stopping operation, greatly improves the benefit.

Description

Technical Field

[0001] This invention belongs to the field of chemical technology, specifically the online refrigerant exchange system for a dry-cooled continuous reforming unit. Background Technology

[0002] Continuous reforming units are core units and "profit growth points" in modern integrated refining and chemical enterprises. Their most significant characteristic is "continuous": the catalyst can continuously circulate between reaction and regeneration throughout its lifespan, ensuring long-term uninterrupted operation. Currently, widely used technologies in domestic continuous reforming units include UOP, Axens, and domestically produced technologies. This invention is the first to apply online catalyst replacement in Axens and domestically produced reforming units. When the catalyst reaches the end of its lifespan and needs replacement, the traditional method involves shutting down the unit for cooling, and then replacing the catalyst after the reaction system has passed the replacement test. This process is costly and reduces unit efficiency. Utility Model Content

[0003] In view of the above problems, the purpose of this application is to provide an online catalyst replacement system for a dry-cooled continuous reforming unit, which enables the catalyst to be replaced online without stopping the unit, thereby greatly improving efficiency.

[0004] To achieve some or all of the above objectives or other objectives, this application provides the following technical solution: an online refrigerant exchange system for a dry-cooled continuous reforming unit, comprising a dry-cooled continuous reforming unit and an online refrigerant exchange system, wherein the online refrigerant exchange system is connected to the dry-cooled continuous reforming unit; the dry-cooled continuous reforming unit comprises a first reactor, a second reactor, a third reactor, a fourth reactor, and a regenerator, forming a circulation loop; a regenerator lower hopper and an elevator are sequentially arranged at the lower part of the regenerator; the online refrigerant exchange system comprises a temporary feeding pipeline and a temporary unloading pipeline; a temporary refrigerant hopper is provided on the temporary feeding pipeline, and the top of the temporary refrigerant hopper is connected to nitrogen injection and discharge pipelines.

[0005] The temporary feeding pipeline is equipped with a replenishing valve and a discharging valve. The replenishing valve is located in front of the temporary feeding hopper, and the discharging valve is located in the rear of the temporary feeding hopper.

[0006] The online refrigerant replacement system also includes a nitrogen inlet pipeline and a nitrogen outlet pipeline; the nitrogen inlet pipeline is connected to the nitrogen inlet and outlet pipelines, and a nitrogen inlet valve is installed on the nitrogen inlet pipeline; the outlet pipeline is connected to the nitrogen inlet and outlet pipelines, and an outlet valve is installed on the outlet pipeline.

[0007] The dry-cold cycle continuous reforming unit is a dry-cold cycle continuous reforming unit in Axens technology, which includes a lift line; the lifter is connected to the upper hopper of the first reactor via the lift line, the lower hopper of the first reactor is connected to the upper hopper of the second reactor, the lower hopper of the second reactor is connected to the upper hopper of the third reactor, the lower hopper of the third reactor is connected to the upper hopper of the fourth reactor, and the lower hopper of the fourth reactor is connected to the top hopper of the regenerator; the first reactor is provided with an upper hopper, and the temporary feed line is connected to the top of the upper hopper of the first reactor.

[0008] A lifting valve is installed on the lifting pipeline, and the lifting valve is located close to the lifting device.

[0009] The temporary unloading pipeline is connected to the bottom of the elevator; valve No. 3 is installed between the lower hopper of the regenerator and the elevator.

[0010] The dry-cooled continuous reforming unit is a domestically produced dry-cooled continuous reforming unit, which includes a lift pipeline; the lifter is connected to the upper hopper of the first reactor via the lift pipeline, the lower hopper of the first reactor is connected to the upper hopper of the second reactor, the lower hopper of the second reactor is connected to the upper hopper of the third reactor, the lower hopper of the third reactor is connected to the upper hopper of the fourth reactor, and the lower hopper of the fourth reactor is connected to the upper hopper of the regenerator.

[0011] The regenerator's lower hopper and the elevator are connected by a No. 1 pipeline. A temporary feeding pipeline and a temporary unloading pipeline are connected to the No. 1 pipeline, with the temporary unloading pipeline located upstream of the temporary feeding pipeline. A No. 1 valve and a No. 2 valve are connected to the No. 1 pipeline. The No. 1 valve is located between the regenerator's lower hopper and the temporary unloading pipeline, while the No. 2 valve is located between the elevator and the feeding pipeline.

[0012] The temporary unloading pipeline is equipped with an unloading valve and a temporary unloading hopper in sequence.

[0013] Compared with the prior art, the beneficial effects of this utility model are: when the catalyst reaches the end of its life and needs to be replaced, the traditional method of catalyst replacement is to shut down the unit, cool it down, and replace it after the reaction system is qualified. This process has high costs and reduces the efficiency of the unit. With this invention, the catalyst can be replaced online without stopping the unit, which greatly improves efficiency.

[0014] Prior to this invention, changing the reactant required a shutdown, with a single reforming unit needing to be shut down for 7 days, or 168 hours. Online reactant changing can save this time. Using this invention, the unit can be changed reactant without stopping operation. The efficiency of refining is calculated based on the difference between the conversion of each component of the unit into aromatics and other high-value-added products and the difference in processing heavy naphtha (taking the break-even price of light naphtha cracking), minus the processing cost of 600 yuan. The calculation result is that the increased benefit per ton of raw material is 663 yuan. The hourly processing capacity is calculated as 440 tons, and the revenue is calculated as (440*168) tons * (663) yuan * 3 sets = 147 million yuan. Among them, the current large-scale reforming unit design is at least dual-series (2 sets) or triple-series (3 sets). Attached Figure Description

[0015] Figure 1 Diagram showing the online refrigerant exchange technology upgrade for the Axens dry-cooling cycle continuous reforming unit; Figure 2 This is a diagram illustrating the online refrigerant exchange technology modification of a domestically produced dry-cooled continuous reforming unit (excluding the second and third reactors); In the diagram: 1. First reactor, 2. Second reactor, 3. Third reactor, 4. Fourth reactor, 5. Regenerator, 6. Temporary feed line, 7. Temporary discharge line, 8. Temporary additive hopper, 9. Nitrogen inlet and outlet lines, 10. Temporary discharge hopper, 11. Additive valve, 12. Discharge valve, 13. Nitrogen inlet line, 14. Nitrogen inlet valve, 15. Discharge line, 16. Discharge valve, 17. Discharge valve, 18. Lifting line, 19. Lifting valve, 20. Upper hopper of the first reactor, 21. Lower hopper of the regenerator, 22. Lifter, 23. Line 1, 24. Valve 1, 25. Valve 2, 26. Valve 3. Detailed Implementation

[0016] To make the structure and function of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Example 1

[0017] See appendix Figure 1 The online refrigerant exchange system for a dry-cooled continuous reforming unit includes a dry-cooled continuous reforming unit and an online refrigerant exchange system, wherein the online refrigerant exchange system is connected to the dry-cooled continuous reforming unit. The dry-cooled continuous reforming unit includes a first reactor 1, a second reactor 2, a third reactor 3, a fourth reactor 4, and a regenerator 5, forming a circulation loop. The lower part of the regenerator 5 is sequentially provided with a lower refrigerant hopper 21 and an elevator 22. The online refrigerant exchange system includes a temporary feeding pipeline 6 and a temporary unloading pipeline 7. A temporary refrigerant hopper 8 is provided on the temporary feeding pipeline 6, and the top of the temporary refrigerant hopper 8 is connected to a nitrogen inlet and outlet pipeline 9.

[0018] The temporary feeding pipeline 6 is equipped with a replenishing valve 11 and a discharging valve 12. The replenishing valve 11 is located in front of the temporary feeding hopper 8, and the discharging valve 12 is located in the rear of the temporary feeding hopper 8.

[0019] The online refrigerant replacement system also includes a nitrogen inlet pipeline 13 and an outlet pipeline 15; the nitrogen inlet pipeline 13 is connected to the nitrogen inlet and outlet pipelines 9, and a nitrogen inlet valve 14 is installed on the nitrogen inlet pipeline 13; the outlet pipeline 15 is connected to the nitrogen inlet and outlet pipelines 9, and an outlet valve 16 is installed on the outlet pipeline 15.

[0020] The dry-cold cycle continuous reforming device is a dry-cold cycle continuous reforming device in Axens technology. The dry-cold cycle continuous reforming device in Axens technology includes a riser line 18. The riser 22 is connected to the upper hopper of the first reactor 1 through the riser line 18. The lower hopper of the first reactor 1 is connected to the upper hopper of the second reactor 2. The lower hopper of the second reactor 2 is connected to the upper hopper of the third reactor 3. The lower hopper of the third reactor 3 is connected to the upper hopper of the fourth reactor 4. The lower hopper of the fourth reactor 4 is connected to the top hopper of the regenerator 5. The first reactor 1 is provided with a first reactor upper hopper 20. The temporary feeding line 6 is connected to the top of the first reactor upper hopper 20.

[0021] A lifting valve 19 is provided on the lifting pipeline 18, and the lifting valve 19 is located near the lifting device 22.

[0022] The temporary unloading pipeline 7 is connected to the bottom of the elevator 22; valve 26 is installed between the lower hopper 21 of the regenerator and the elevator 22.

[0023] Axens Technology: A temporary dosing hopper 8 is added to the top of the upper hopper 20 of the first reactor. The temporary dosing hopper 8 has a capacity of at least 2-3 tons of replenishment per hour. A formal pipeline connects the temporary dosing hopper 8 to the upper hopper 20 of the first reactor, and a discharge valve 12 is installed. The pipe diameter is kept consistent with the original riser pipeline diameter. A formal pipeline connects the new agent inlet and the inlet of the temporary dosing hopper 8, and a replenishment valve 11 is added. The pipe diameter is kept consistent with the original riser pipeline diameter. Nitrogen inlet and outlet pipelines are added to the temporary dosing hopper 8. New agent is added to the temporary dosing hopper at atmospheric pressure, pressurized to the same pressure as the upper hopper of the first reactor, and the agent in the temporary hopper is discharged into the upper hopper of the first reactor, completing one batch of new agent replenishment. A temporary discharge hopper is added to the bottom of the regenerator, with a capacity of 2-3 tons of discharge per hour. The old agent is discharged and recovered after cooling to low temperature.

[0024] Through technological upgrades, the Axens unit can incorporate a feeding hopper at the top of the hopper above the first reactor to add fresh catalyst for replacement. A discharge pipeline and discharge tank are added between the lower hopper of the regenerator and the elevator to discharge the old catalyst. The discharge process fully utilizes the regenerator to perform shallow coking and thorough cooling of the old catalyst, ensuring its safe discharge. The alternating and continuous loading and unloading of the new catalyst allows for uninterrupted, online catalyst replacement. Example 2

[0025] See appendix Figure 2 The online refrigerant exchange system for a dry-cooled continuous reforming unit includes a dry-cooled continuous reforming unit and an online refrigerant exchange system, wherein the online refrigerant exchange system is connected to the dry-cooled continuous reforming unit. The dry-cooled continuous reforming unit includes a first reactor 1, a second reactor 2, a third reactor 3, a fourth reactor 4, and a regenerator 5, forming a circulation loop. The lower part of the regenerator 5 is sequentially provided with a lower refrigerant hopper 21 and an elevator 22. The online refrigerant exchange system includes a temporary feeding pipeline 6 and a temporary unloading pipeline 7. A temporary refrigerant hopper 8 is provided on the temporary feeding pipeline 6, and the top of the temporary refrigerant hopper 8 is connected to a nitrogen inlet and outlet pipeline 9.

[0026] The temporary feeding pipeline 6 is equipped with a replenishing valve 11 and a discharging valve 12. The replenishing valve 11 is located in front of the temporary feeding hopper 8, and the discharging valve 12 is located in the rear of the temporary feeding hopper 8.

[0027] The online refrigerant replacement system also includes a nitrogen inlet pipeline 13 and an outlet pipeline 15; the nitrogen inlet pipeline 13 is connected to the nitrogen inlet and outlet pipelines 9, and a nitrogen inlet valve 14 is installed on the nitrogen inlet pipeline 13; the outlet pipeline 15 is connected to the nitrogen inlet and outlet pipelines 9, and an outlet valve 16 is installed on the outlet pipeline 15.

[0028] The dry-cooled continuous reforming device is a domestically produced dry-cooled continuous reforming device, which includes a lift line 18. The lifter 22 is connected to the upper hopper of the first reactor 1 through the lift line 18. The lower hopper of the first reactor 1 is connected to the upper hopper of the second reactor 2. The lower hopper of the second reactor 2 is connected to the upper hopper of the third reactor 3. The lower hopper of the third reactor 3 is connected to the upper hopper of the fourth reactor 4. The lower hopper of the fourth reactor 4 is connected to the upper hopper of the regenerator 5.

[0029] The regenerator's lower hopper 21 and the elevator 22 are connected by a first pipeline 23. The first pipeline 23 is connected to a temporary feeding pipeline 6 and a temporary unloading pipeline 7. The temporary unloading pipeline 7 is located upstream of the temporary feeding pipeline 6. The first pipeline 23 is connected to a first valve 24 and a second valve 25. The first valve 24 is located between the regenerator's lower hopper 21 and the temporary unloading pipeline 7, and the second valve 25 is located between the elevator 22 and the feeding pipeline 6.

[0030] The temporary unloading pipeline 7 is equipped with an unloading valve 17 and a temporary unloading hopper 10 in sequence.

[0031] Domestic technology: At the top of the booster 22 at the bottom of the regenerator, the two valves (valve 24 and valve 25) are disconnected for modification. A pipeline for adding fresh catalyst and a temporary additive hopper 8 are connected to the valve (valve 25) at the top of the booster. The temporary additive hopper 8 has a capacity of at least 2-3 tons of additive per hour. The diameter of the inlet pipeline of the temporary additive hopper 8 is kept consistent with the original booster pipeline diameter, and a additive valve 11 is added. A nitrogen inlet and outlet pipeline 9 is added to the temporary additive hopper. New catalyst is added to the temporary hopper at atmospheric pressure, pressurized to match the booster pressure, and the catalyst in the temporary hopper is unloaded into the booster, completing one batch of new catalyst addition. An unloading pipeline and a temporary unloading hopper 10 are added below the shut-off valve of the lower hopper of the regenerator, with a capacity of 2-3 tons of unloading per hour. The old catalyst is unloaded and recycled after cooling to low temperature.

[0032] The domestically produced equipment can add a temporary unloading pipeline 7 and a temporary unloading hopper 10 between the lower hopper of the regenerator and the elevator to unload the old catalyst. The old catalyst unloading process makes full use of the regenerator to perform shallow coking and sufficient cooling of the old catalyst to ensure the safe unloading of the old catalyst. A replenishing hopper is added at the top of the elevator to add the fresh catalyst that needs to be replaced. This can ensure the continuity of the replacement of old and new catalysts.

[0033] The modified catalyst can be replaced online, allowing the unit to operate continuously without shutdown. Conventional catalyst replacement requires approximately 7 days of downtime, significantly increasing operating costs and reducing efficiency. With this online catalyst replacement scheme, new catalyst loading and old catalyst unloading are separated, with an expected rate of 2-3 t / h. Based on the catalyst reserves in the system, the replacement time is estimated at approximately 4-6 days, greatly improving replacement efficiency. Existing equipment is fully utilized, reducing investment expenditure. Unloading is achieved at a temporary hopper added at the bottom of the regenerator. By adjusting the regenerator's operating parameters, the regenerator can be used to perform shallow coking of the old catalyst, followed by thorough cooling in the oxychlorination and roasting zones, ensuring the old catalyst is discharged as a low-temperature white agent, thus improving the safety of old catalyst unloading.

[0034] Table 1: Typical Catalyst Loading Data for a Processing Capacity of 3 Million Tons

[0035] Calculated from the data in the table above: The catalyst reserves are 265 tons, and the replacement rate is expected to reach about 2-3 t / h. Based on the amount of catalyst in the system, the replacement time is estimated to be about 4-6 days, which greatly improves the replacement efficiency.

[0036] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. An online refrigerant exchange system for a dry-cooled continuous reforming unit, characterized in that: The system includes a dry-cooled continuous reforming unit and an online exchange system, wherein the online exchange system is connected to the dry-cooled continuous reforming unit; the dry-cooled continuous reforming unit includes a first reactor (1), a second reactor (2), a third reactor (3), a fourth reactor (4) and a regenerator (5) to form a circulation loop; the lower part of the regenerator (5) is provided with a regenerator lower hopper (21) and an elevator (22); the online exchange system includes a temporary feeding pipeline (6) and a temporary unloading pipeline (7); a temporary additive hopper (8) is provided on the temporary feeding pipeline (6), and the top of the temporary additive hopper (8) is connected to a nitrogen inlet and outlet pipeline (9).

2. The online refrigerant exchange system for the dry-cooled continuous reforming unit according to claim 1, characterized in that: The temporary feeding pipeline (6) is equipped with a replenishing valve (11) and a discharging valve (12). The replenishing valve (11) is located in front of the temporary feeding hopper (8), and the discharging valve (12) is located in the rear of the temporary feeding hopper (8).

3. The online refrigerant exchange system for the dry-cooled continuous reforming unit according to claim 1, characterized in that: The online refrigerant replacement system also includes a nitrogen inlet pipeline (13) and an outlet pipeline (15); the nitrogen inlet pipeline (13) is connected to the nitrogen inlet and outlet pipeline (9), and a nitrogen inlet valve (14) is provided on the nitrogen inlet pipeline (13); the outlet pipeline (15) is connected to the nitrogen inlet and outlet pipeline (9), and an outlet valve (16) is provided on the outlet pipeline (15).

4. The online refrigerant exchange system for a dry-cooled continuous reforming unit according to any one of claims 1-3, characterized in that: The dry-cold cycle continuous reforming device is a dry-cold cycle continuous reforming device in Axens technology. The dry-cold cycle continuous reforming device in Axens technology includes a lift line (18). The lifter (22) is connected to the upper hopper of the first reactor (1) through the lift line (18). The lower hopper of the first reactor (1) is connected to the upper hopper of the second reactor (2). The lower hopper of the second reactor (2) is connected to the upper hopper of the third reactor (3). The lower hopper of the third reactor (3) is connected to the upper hopper of the fourth reactor (4). The lower hopper of the fourth reactor (4) is connected to the top hopper of the regenerator (5). The first reactor (1) is provided with a first reactor upper hopper (20). The temporary feeding line (6) is connected to the top of the first reactor upper hopper (20).

5. The online refrigerant exchange system for the dry-cooled continuous reforming unit according to claim 4, characterized in that: A lifting valve (19) is provided on the lifting pipeline (18), and the lifting valve (19) is located near the lifting device (22).

6. The online refrigerant exchange system for the dry-cooled continuous reforming unit according to claim 4, characterized in that: The temporary unloading pipeline (7) is connected to the bottom of the elevator (22); valve No. 3 (26) is installed between the lower hopper (21) of the regenerator and the elevator (22).

7. The online refrigerant exchange system for a dry-cooled continuous reforming unit according to any one of claims 1-3, characterized in that: The dry-cold cycle continuous reforming device is a domestically produced dry-cold cycle continuous reforming device. The domestically produced dry-cold cycle continuous reforming device includes a lift line (18). The lifter (22) is connected to the upper hopper of the first reactor (1) through the lift line (18). The lower hopper of the first reactor (1) is connected to the upper hopper of the second reactor (2). The lower hopper of the second reactor (2) is connected to the upper hopper of the third reactor (3). The lower hopper of the third reactor (3) is connected to the upper hopper of the fourth reactor (4). The lower hopper of the fourth reactor (4) is connected to the upper hopper of the regenerator (5).

8. The online refrigerant exchange system for a dry-cooled continuous reforming unit according to claim 7, characterized in that: The regenerator's lower hopper (21) and the elevator (22) are connected by a first pipeline (23), which connects a temporary feeding pipeline (6) and a temporary unloading pipeline (7). The temporary unloading pipeline (7) is located in front of the temporary feeding pipeline (6). The first pipeline (23) connects a first valve (24) and a second valve (25), which is located between the regenerator's lower hopper (21) and the temporary unloading pipeline (7), and the second valve (25) is located between the elevator (22) and the feeding pipeline (6).

9. The online refrigerant exchange system for a dry-cooled continuous reforming unit according to claim 7, characterized in that: The temporary unloading pipeline (7) is equipped with an unloading valve (17) and a temporary unloading hopper (10) in sequence.

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