Cold hydrogen disc structure for up-flow fluidized bed reactor
By designing a cold hydrogen disk structure in the upstream boiling bed reactor and evenly distributing cold hydrogen by using a cold hydrogen distributor, the problem of uneven temperature distribution of the catalyst bed is solved, and the effect of effective cooling and preventing catalyst powdering is achieved.
Patent Information
- Application Number
- CN202421660261.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-07-15
AI Technical Summary
In the upstream boiling bed reactor, the catalyst bed has uneven distribution of pores and surface impurities, resulting in inconsistent activity, local hot spots, resulting in uneven temperature distribution, which leads to catalyst powdering, inactivation and equipment damage.
A cold hydrogen disk structure is designed to be installed on the lower part of the raw material distribution plate in the reactor shell, including a reinforced vertical pipe with a top seal, a cold hydrogen delivery pipe, a cold hydrogen ring pipe and a cold hydrogen distributor. The cold hydrogen is evenly distributed through the distributor, mixed with the raw materials, reducing the temperature and avoiding local quenching.
Through the use of the cold hydrogen disk structure, the raw material temperature can be effectively reduced, evenly cooled, avoid catalyst powdering and inactivation, prolong the catalyst life and prevent equipment damage.
Smart Images
Figure CN222829603U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fluidized bed reactors, in particular to a cold hydrogen plate structure for an upflow fluidized bed reactor. Background Art
[0002] In the chemical production process, in order to improve the yield and product quality of light oil, hydrogenation is often used to remove impurities such as S, N, O and metals in the oil and improve product quality. This process needs to be carried out in a hydrogenation reactor.
[0003] Upflow fluidized bed reactors are widely used in catalytic reactions and adsorption processes. Their working principle is to evenly mix, distribute, and pass through the catalyst bed through a distribution plate. High-speed oil and gas move upward while being evenly mixed with hydrogen, and the oil and gas are separated from the catalyst particles. The catalyst particles remain in the reactor, and the oil and gas enter the next stage. In this process, as the catalyst life cycle increases, the impurities adsorbed in the catalyst pores and on the surface are unevenly distributed, resulting in inconsistent catalyst activity. Local hot spots will also occur during operation, resulting in uneven bed temperature distribution. In order to suppress the development of this situation, cold hydrogen injection can be used for intervention. Summary of the invention
[0004] In order to overcome the shortcomings and deficiencies in the prior art, the utility model aims to provide a cold hydrogen tray structure for an upflow fluidized bed reactor.
[0005] The purpose of the utility model is achieved through the following technical solutions: a cold hydrogen plate structure for an upflow fluidized bed reactor, the cold hydrogen plate structure is installed at the lower part of the raw material distribution plate in the reactor shell, the cold hydrogen plate structure includes a reinforced vertical pipe with a closed top, a cold hydrogen delivery pipe transversely fixed to the upper part of the reinforced vertical pipe, a cold hydrogen ring pipe fixed to the bottom of the reinforced vertical pipe, and a plurality of cold hydrogen distributors fixed to the top of the cold hydrogen ring pipe, the cold hydrogen delivery pipe, the reinforced vertical pipe and the cold hydrogen ring pipe are connected in sequence, each cold hydrogen distributor includes an air inlet pipe connected to the cold hydrogen ring pipe, a first distribution network transversely fixed to the middle part of the air inlet pipe, a one-way valve plate hinged to the inner side wall of the middle part of the air inlet pipe, a head fixed to the top of the air inlet pipe and a bumper cover arranged on the outside of the head, a second distribution network is fixed to the inner side of the upper side wall of the air inlet pipe corresponding to the bumper cover, and a hydrogen outlet is arranged at the bottom of the bumper cover.
[0006] Furthermore, a tear hole is provided on the upper side wall of the air inlet pipe.
[0007] Furthermore, the cold hydrogen plate structure is fixed to the lower part of the raw material distribution plate by bolts.
[0008] Furthermore, the cold hydrogen ring pipe is composed of multiple sections of arc-shaped pipes connected in sequence.
[0009] Furthermore, the connection points of two adjacent arc-shaped tubes are fixedly connected by a flange.
[0010] The beneficial effects of the utility model are as follows: when the cold hydrogen plate structure of the utility model is used, cold hydrogen enters through the air inlet pipe, is evenly distributed for the first time in the first distribution network, and the one-way valve plate is pushed open by the upward driving force of the hydrogen, and the hydrogen is evenly distributed for the second time through the second distribution network and enters the anti-impact shield. The hydrogen outlet at the bottom of the anti-impact shield is evenly distributed and then evenly mixed with the system feed; the excessively high temperature of the raw materials or the raw materials that have not been completely reacted can be reduced, and at the same time, the problem of excessive temperature difference between the upper and lower layers and the left and right layers of the catalyst bed caused in this process, which ultimately leads to catalyst pulverization, deactivation, shortened life, and equipment damage, can be solved.
[0011] The cold hydrogen plate structure of the utility model is installed at the lower part of the raw material distribution plate in the reactor shell. By changing the installation position of the cold hydrogen plate, it is more suitable for the upflow fluidized bed reactor, and the raw materials entering the reaction can be mixed with cold hydrogen alone first, and the temperature can be evenly reduced, avoiding the catalyst rupture and pulverization caused by the local rapid cooling phenomenon in the cooling process. The one-way valve plate is in an open state when hydrogen flows from bottom to top. When there is no fluid flowing from bottom to top, its own gravity automatically closes it. The one-way valve plate also plays a role in blocking the backflow of fluid to the hydrogen system; the anti-impact cover prevents the external fluid from directly flowing back into the distributor, and also slows down the flushing effect of the injected cold hydrogen on other internal parts, so that the hydrogen can be evenly and gently mixed into the raw materials to play a cooling role.
[0012] The cold hydrogen plate structure of the utility model is applied to the internal parts of the reactor, which can effectively suppress the local hot spots of the bed layer, and will not cause the catalyst to be pulverized due to the sudden injection of low-temperature medium into the bed layer, which will eventually cause the catalyst to run away; and a special cold hydrogen distributor is used on the cold hydrogen plate to prevent blockage and prevent liquid from entering the hydrogen pipeline. The cold hydrogen plate structure of the utility model can be used alone with the raw material distributor, connected by bolts, and is simple and convenient to disassemble and clean, avoiding welding problems with the inside of the equipment during the entire use process. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the utility model.
[0014] Figure 2 It is a top view of the utility model.
[0015] Figure 3 It is a structural schematic diagram of the cold hydrogen distributor of the utility model.
[0016] The accompanying drawings are marked as: reinforced vertical pipe 1, cold hydrogen delivery pipe 2, cold hydrogen ring pipe 3, arc pipe 31, support 32, flange 33, cold hydrogen distributor 4, air inlet pipe 41, first distribution network 42, one-way valve plate 43, head 44, anti-impact cover 45, second distribution network 46, hydrogen outlet 47, rotating shaft 48, tear hole 49. DETAILED DESCRIPTION
[0017] In order to facilitate the understanding of those skilled in the art, the following embodiments and attached Figure 1-3 To further illustrate the present invention, the contents mentioned in the implementation modes are not intended to limit the present invention.
[0018] See Figure 1-3 A cold hydrogen plate structure for an upflow fluidized bed reactor, the cold hydrogen plate structure is installed at the lower part of a raw material distribution plate in a reactor shell, the cold hydrogen plate structure comprises a reinforced vertical pipe 1 with a closed top, a cold hydrogen delivery pipe 2 transversely fixed to the upper part of the reinforced vertical pipe 1, a cold hydrogen ring pipe 3 fixed to the bottom of the reinforced vertical pipe 1, and a plurality of cold hydrogen distributors 4 fixed to the top of the cold hydrogen ring pipe 3, the cold hydrogen delivery pipe 2, the reinforced vertical pipe 1 and the cold hydrogen ring pipe 3 are connected in sequence, each cold hydrogen distributor 4 comprises an air inlet pipe 41 connected to the cold hydrogen ring pipe 3, a first distribution net 42 transversely fixed to the middle part of the air inlet pipe 41, a one-way valve plate 43 hinged to the inner side wall of the middle part of the air inlet pipe 41, a head 44 fixed to the top of the air inlet pipe 41 and a shockproof cover 45 covered on the outside of the head 44, a second distribution net 46 is fixed to the inner side of the upper side wall of the air inlet pipe 41 corresponding to the shockproof cover 45, and a hydrogen outlet 47 is arranged at the bottom of the shockproof cover 45. The cold hydrogen distributor 4 and the cold hydrogen ring pipe 3 can be connected by a double connection of thread and bayonet to prevent falling off and uneven hydrogen distribution. Strengthening the vertical pipe 1 can reduce the flow rate of cold hydrogen and prevent impact on the cold hydrogen ring pipe 3. The one-way valve plate 43 rotates with the rotating shaft 48 as the center point. When the fluid flows from bottom to top, the valve plate is pushed to rotate and open. When there is no fluid flowing, the valve plate rotates in the opposite direction due to its own gravity. When the fluid flows from top to bottom, the valve plate will rotate and close under the push of the fluid.
[0019] When the cold hydrogen plate structure of the utility model is used, cold hydrogen enters through the air inlet pipe 41, is evenly distributed for the first time in the first distribution network 42, and the one-way valve plate 43 is pushed open by the upward driving force of the hydrogen, and the hydrogen is evenly distributed for the second time through the second distribution network 46 and enters the anti-impact cover 45. The hydrogen outlet 47 at the bottom of the anti-impact cover 45 is evenly distributed and then evenly mixed with the system feed. The excessively high temperature of the raw materials or the raw materials that have not reacted completely can be reduced, and at the same time, the problem of excessive temperature difference between the upper and lower layers and the left and right layers of the catalyst bed caused in this process, which ultimately leads to catalyst pulverization, deactivation, shortened life, and equipment damage, can be solved.
[0020] In this embodiment, a tear hole 49 is provided on the upper side wall of the air inlet pipe 41. The tear hole 49 can be used to assist exhaust.
[0021] In this embodiment, the cold hydrogen plate structure is fixed to the lower part of the raw material distribution plate by bolts. The above structure is convenient for disassembly and assembly of the cold hydrogen plate structure. A plurality of support members 32 for supporting the cold hydrogen plate structure are fixed on the cold hydrogen ring pipe 3.
[0022] In this embodiment, the cold hydrogen ring pipe 3 is composed of multiple arc-shaped pipes 31 connected in sequence. The above structure is convenient for disassembly and assembly of the cold hydrogen ring pipe 3. Specifically, the connection between two adjacent arc-shaped pipes 31 is fixedly connected by a flange 33.
[0023] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.
Claims
1. A cold hydrogen plate structure for an upflow fluidized bed reactor, the cold hydrogen plate structure being installed at the lower part of a raw material distribution plate in a reactor shell, characterized in that: The cold hydrogen disk structure includes a reinforced vertical pipe with a closed top, a cold hydrogen delivery pipe transversely fixed to the upper part of the reinforced vertical pipe, a cold hydrogen ring pipe fixed to the bottom of the reinforced vertical pipe, and a plurality of cold hydrogen distributors fixed to the top of the cold hydrogen ring pipe. The cold hydrogen delivery pipe, the reinforced vertical pipe and the cold hydrogen ring pipe are connected in sequence. Each cold hydrogen distributor includes an intake pipe connected to the cold hydrogen ring pipe, a first distribution network transversely fixed to the middle part of the intake pipe, a one-way valve plate hinged to the inner side wall of the middle part of the intake pipe, a head fixed to the top of the intake pipe, and a shockproof cover arranged on the outside of the head. A second distribution network is fixed to the inner side of the upper side wall of the intake pipe corresponding to the shockproof cover, and a hydrogen outlet is arranged at the bottom of the shockproof cover.
2. The cold hydrogen tray structure for an upflow ebullating bed reactor according to claim 1, characterized in that: The upper side wall of the air inlet pipe is provided with a tear hole.
3. The cold hydrogen tray structure for an upflow ebullating bed reactor according to claim 1, characterized in that: The cold hydrogen plate structure is fixed to the lower part of the raw material distribution plate by bolts.
4. The cold hydrogen tray structure for an upflow ebullating bed reactor according to claim 1, characterized in that: The cold hydrogen ring pipe is composed of a plurality of arc-shaped pipes connected in sequence.
5. The cold hydrogen tray structure for an upflow ebullating bed reactor according to claim 4, characterized in that: The connection points of two adjacent arc-shaped tubes are fixedly connected by flanges.