On-line spent catalyst filling system for propane dehydrogenation device
By designing an online filling system for spent catalyst, the problem of online catalyst filling in the propane dehydrogenation unit was solved, the recycling and regeneration of the catalyst was realized, the production cost was reduced, and the stable operation of the unit was ensured.
Patent Information
- Application Number
- CN202422637390.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-30
AI Technical Summary
During the shutdown period of existing propane dehydrogenation units, the catalyst to be regenerated cannot be added online, resulting in a decrease in catalyst reserves, an increase in the use of fresh catalyst and production costs, and an inability to ensure the smooth operation of the unit.
An online filling system for spent catalyst for propane dehydrogenation unit was designed. The spent catalyst filling device was installed through the reserved equipment port of No. 4 riser. The spent catalyst was filled into the regeneration reactor for regeneration. After the activity was restored, it was returned to the reaction unit for use, reducing the use of fresh catalyst and realizing the recycling of catalyst.
The online filling and regeneration of the spent catalyst is realized, the catalyst reserve in the reaction system is maintained, the use of fresh catalyst is reduced, the production cost is reduced, and the stable operation of the device is ensured.
Smart Images
Figure CN223381558U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of propane dehydrogenation devices, and particularly relates to an online filling system for spent catalysts used in propane dehydrogenation devices. Background Art
[0002] Currently, propane dehydrogenation technology typically utilizes UOP's Oleflex catalytic dehydrogenation process, which utilizes four moving bed reactors. This process primarily utilizes the DEH-16 platinum-based precious metal catalyst, which features high selectivity, high thermal stability, low wear rate, and the ability to operate under harsh conditions. Due to the impact of propane feedstock prices and the construction of new propane dehydrogenation units, profit margins for propane dehydrogenation units have continued to decline, leading to increasing downtime and frequency.
[0003] Since the Oleflex catalytic dehydrogenation reaction system operates in a catalyst circulation mode, during the standby period of the unit (the system has not been discharged), it is necessary to remove part of the catalyst from the bottom of the four reactors every week to loosen the catalyst bed of the reactor to maintain the flow state of the catalyst and protect the inner and outer nets of the reactor so that the reactor system can be put into operation at any time. However, the removed catalyst has not been regenerated, and its catalytic activity has not been restored. It has a high carbon content and low activity. It cannot be directly added in the same way as fresh catalyst. It can only be stored separately and reused after the unit is overhauled and discharged. It cannot be added when the unit is in operation or when the unit is shut down without discharging materials. This easily leads to a decrease in the catalyst reserves in the system, and it can only be replenished by adding a large amount of fresh catalyst, which greatly increases the operating cost of the unit.
[0004] Therefore, it is necessary to design the propane dehydrogenation unit so that the used catalyst can be regenerated and recycled. Utility Model Content
[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide an online filling system for spent catalyst for a propane dehydrogenation device, so as to realize online filling of spent catalyst, complete the recycling of spent catalyst, avoid the backlog and waste of spent catalyst, reduce the additional filling of fresh catalyst on the basis of ensuring the catalyst reserve in the reaction system, reduce production costs, and realize the smooth operation of the device.
[0006] The utility model discloses an online filling system for regenerated catalyst for a propane dehydrogenation device, comprising a No. 1 reactor, wherein the bottom end of the No. 1 reactor is connected to a No. 1 catalyst collector, which is connected to a No. 1 riser, which is connected to a No. 2 reactor, the top end of the No. 1 reactor is connected to a No. 5 riser, which is connected to a No. 2 lock hopper, which is connected to a regeneration collector, which is connected to a regeneration separator, which is connected to a regeneration reactor, and the regeneration reactor is connected to an intermediate separation hopper via an L valve group.
[0007] Preferably, the No. 2 reactor is connected to the No. 2 catalyst collector, and the No. 2 catalyst collector is connected to the No. 2 riser.
[0008] Preferably, the No. 2 riser is connected to the No. 3 reactor, the No. 3 reactor is connected to the No. 3 catalyst collector, and the No. 3 catalyst collector is connected to the No. 3 riser.
[0009] Preferably, the No. 3 lifter is connected to the No. 4 reactor, the No. 4 reactor is connected to the No. 4 catalyst collector, and the No. 4 catalyst collector is connected to the No. 4 lifter through the No. 1 lock hopper.
[0010] Preferably, the No. 4 elevator is connected to the intermediate separation hopper.
[0011] Preferably, the No. 4 riser is connected to the catalyst buffer pipe through a catalyst filling pipeline, and a lower filling ball valve is provided on the catalyst filling pipeline.
[0012] Preferably, the catalyst buffer tube is connected to the filling hopper via a pipeline, an upper filling ball valve is provided on the pipeline, and a rainproof cover is provided on the filling hopper.
[0013] Specifically, the propane dehydrogenation unit of the present invention uses an online regenerated catalyst filling system. This system utilizes the reserved equipment port of lifter No. 4, with a regenerated catalyst filling device installed above the reserved port to complete the filling of the regenerated catalyst. The regenerated catalyst is lifted by lifter No. 4 into the intermediate separation hopper, and then into the regeneration reactor for regeneration. After regaining activity, it is returned to the reaction unit via lifter No. 5 for continued use. Lifter No. 5 is connected to reactor No. 1 in the reaction unit, which is connected to catalyst collector No. 1 for collecting the catalyst. The catalyst is then transferred from lifter No. 1 to reactor No. 2. The reaction unit is provided with four sections for completing the propane dehydrogenation reaction. Except for the fourth section, which is provided with a lock hopper No. 1, the remaining sections operate in the same manner. The catalyst filling facility for to-be-generated catalyst consists of two filling ball valves, a catalyst buffer pipe, a catalyst filling pipeline, a filling hopper and a stainless steel rainproof cover. The two filling ball valves are located at both ends of the catalyst buffer pipe and use DN100 carbon steel ball valves. The catalyst buffer pipe uses a 0.5-meter-long DN200 straight pipe section, which can temporarily store and buffer the to-be-generated catalyst. The two filling ball valves are normally in a closed state. During the actual filling process, the to-be-generated catalyst is first filled into the filling hopper, and then the upper filling ball valve is opened to allow the catalyst to enter the catalyst buffer pipe. After all the catalyst has entered, the upper filling ball valve is closed, and the lower filling ball valve at the bottom of the buffer section is opened. The to-be-generated catalyst enters the No. 4 riser through the inclined catalyst filling pipeline. One of the two filling ball valves is always in a closed state, and the catalyst filling pipeline enters the No. 4 riser at an angle, which effectively prevents abnormal operating conditions such as the catalyst not falling and the catalyst backblowing.
[0014] Compared with the prior art, the utility model has the following beneficial effects: it solves the operational problem of the propane dehydrogenation device in which the spent catalyst cannot be added online, realizes the recycling of the spent catalyst, reduces the use of fresh catalyst, and saves production costs; it effectively guarantees the catalyst circulation storage in the reaction system, thereby ensuring the operational effect of the propane dehydrogenation device reaction system, reduces the addition of fresh catalyst, and is of great significance to maintaining the stable operation of the reaction system. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a structural schematic diagram of an online filling system for spent catalyst used in a propane dehydrogenation unit of the present invention.
[0016] In the figure: 1, Reactor No. 1; 2, Catalyst collector No. 1; 3, Elevator No. 1; 4, Reactor No. 2; 5, Catalyst collector No. 2; 6, Elevator No. 2; 7, Reactor No. 3; 8, Catalyst collector No. 3; 9, Elevator No. 3; 10, Reactor No. 4; 11, Catalyst collector No. 4; 12, Lock hopper No. 1; 13, Elevator No. 4; 14, Catalyst filling pipeline; 15, Lower filling ball valve; 16, Catalyst buffer pipe; 17, Upper filling ball valve; 18, Filling hopper; 19, Intermediate separation hopper; 20, L valve group; 21, Regeneration reactor; 22, Regeneration separator; 23, Regeneration collector; 24, Lock hopper No. 2; 25, Elevator No. 5; 26, Rain cover. DETAILED DESCRIPTION
[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0018] like Figure 1 As shown, the online filling system for the spent catalyst for the propane dehydrogenation unit includes a No. 1 reactor 1 and a No. 4 riser 13. The bottom end of the No. 1 reactor 1 is connected to the No. 1 catalyst collector 2, the No. 1 catalyst collector 2 is connected to the No. 1 riser 3, the No. 1 riser 3 is connected to the No. 2 reactor 4, the No. 4 riser 13 is connected to the intermediate separation hopper 19, the intermediate separation hopper 19 is connected to the regeneration reactor 21 through the L valve group 20, the regeneration reactor 21 is connected to the regeneration separator 22, the regeneration separator 22 is connected to the regeneration collector 23, the regeneration collector 23 is connected to the No. 2 lock hopper 24, the No. 2 lock hopper 24 is connected to the No. 5 riser 25, and the No. 5 riser 25 is connected to the top of the No. 1 reactor 1.
[0019] The No. 2 reactor 4 is connected to the No. 2 catalyst collector 5 , and the No. 2 catalyst collector 5 is connected to the No. 2 riser 6 .
[0020] The No. 2 riser 6 is connected to the No. 3 reactor 7 , the No. 3 reactor 7 is connected to the No. 3 catalyst collector 8 , and the No. 3 catalyst collector 8 is connected to the No. 3 riser 9 .
[0021] The No. 3 lifter 9 is connected to the No. 4 reactor 10 , the No. 4 reactor 10 is connected to the No. 4 catalyst collector 11 , and the No. 4 catalyst collector 11 is connected to the No. 4 lifter 13 via the No. 1 lock hopper 12 .
[0022] The No. 4 lifter 13 is connected to the catalyst buffer pipe 16 via a catalyst filling pipeline 14 , and a lower filling ball valve 15 is provided on the catalyst filling pipeline 14 .
[0023] The catalyst buffer tube 16 is connected to the filling hopper 18 through a pipeline. An upper filling ball valve 17 is provided on the pipeline. A rainproof cover 26 is provided on the filling hopper 18.
[0024] Specifically, the propane dehydrogenation unit of the present invention uses an online regenerated catalyst filling system, which utilizes the reserved equipment port of the No. 4 lifter 13. A regenerated catalyst filling device is installed on the upper portion of the reserved equipment port to complete the filling of the regenerated catalyst. The regenerated catalyst is lifted by the No. 4 lifter 13 and enters the intermediate separation hopper 19, and then enters the regeneration reactor 21 for regeneration. After regaining activity, it is returned to the reaction unit through the No. 5 lifter for continued use. The No. 5 lifter is connected to the No. 1 reactor 1 in the reaction unit, and the No. 1 reactor 1 is connected to the No. 1 catalyst collector 2 for collecting the catalyst. The catalyst passes through the No. 1 lifter 3 to the No. 2 reactor 4. The reaction unit is provided with a total of four sections for completing the propane dehydrogenation reaction. Except for the fourth section provided with the No. 1 lock hopper 12, the operation process of the remaining sections is the same. The facilities for filling the catalyst to be generated are composed of an upper filling ball valve 17, a lower filling ball valve 15, a catalyst buffer pipe 16, a catalyst filling pipeline 14, a filling hopper 18 and a stainless steel rainproof cover 26. Two of the filling ball valves are located at both ends of the catalyst buffer pipe 16, and are DN100 carbon steel ball valves. The catalyst buffer pipe 16 uses a 0.5-meter-long DN200 straight pipe section, which can temporarily store and buffer the added catalyst to be generated; the two filling ball valves are normally in a closed state. During the actual filling process, the catalyst to be generated is first filled into the filling hopper 18, and then the upper filling ball valve 17 is opened to allow the catalyst to enter the catalyst buffer pipe 16. After all the catalyst has entered, the upper filling ball valve 17 is closed, and the lower filling ball valve 15 at the bottom of the buffer section is opened. The catalyst to be generated enters the No. 4 lifter 13 through the catalyst filling pipeline 14. One of the two filling ball valves is always in a closed state.
Claims
1. An online filling system for spent catalyst for a propane dehydrogenation unit, characterized in that: The invention comprises a No. 1 reactor (1) and a No. 4 lifter (13), wherein the bottom end of the No. 1 reactor (1) is connected to the No. 1 catalyst collector (2), the No. 1 catalyst collector (2) is connected to the No. 1 lifter (3), the No. 1 lifter (3) is connected to the No. 2 reactor (4), the No. 4 lifter (13) is connected to the intermediate separation hopper (19), the intermediate separation hopper (19) is connected to the regeneration reactor (21) through the L valve group (20), the regeneration reactor (21) is connected to the regeneration separator (22), the regeneration separator (22) is connected to the regeneration collector (23), the regeneration collector (23) is connected to the No. 2 lock hopper (24), the No. 2 lock hopper (24) is connected to the No. 5 lifter (25), and the No. 5 lifter (25) is connected to the top end of the No. 1 reactor (1).
2. The online filling system for spent catalyst for propane dehydrogenation device according to claim 1, characterized in that: The No. 2 reactor (4) is connected to the No. 2 catalyst collector (5), and the No. 2 catalyst collector (5) is connected to the No. 2 riser (6).
3. The online filling system for spent catalyst for a propane dehydrogenation device according to claim 2, characterized in that: The No. 2 riser (6) is connected to the No. 3 reactor (7), the No. 3 reactor (7) is connected to the No. 3 catalyst collector (8), and the No. 3 catalyst collector (8) is connected to the No. 3 riser (9).
4. The online filling system for spent catalyst for a propane dehydrogenation unit according to claim 3, characterized in that: The No. 3 lifter (9) is connected to the No. 4 reactor (10), the No. 4 reactor (10) is connected to the No. 4 catalyst collector (11), and the No. 4 catalyst collector (11) is connected to the No. 4 lifter (13) through the No. 1 lock hopper (12).
5. The online filling system for spent catalyst for a propane dehydrogenation unit according to claim 1, characterized in that: The No. 4 lifter (13) is connected to the catalyst buffer pipe (16) via a catalyst filling pipeline (14), and a lower filling ball valve (15) is provided on the catalyst filling pipeline (14).
6. The online filling system for spent catalyst for a propane dehydrogenation unit according to claim 5, characterized in that: The catalyst buffer tube (16) is connected to the filling hopper (18) through a pipeline, an upper filling ball valve (17) is provided on the pipeline, and a rainproof cover (26) is provided on the filling hopper (18).