Circulating heavy oil catalytic cracking reactor adopting cold regenerated catalyst

Abstract

The utility model discloses a circulating heavy oil catalytic cracking reactor adopting a cold regenerated catalyst, which relates to the technical field of heavy oil catalytic cracking reactors and comprises a reactor base, a reaction kettle and a control box, a passivator storage box is fixedly mounted on the top wall of one side of the control box, and a quantitative input cylinder is arranged at the top of the reaction kettle. A driving rod is rotatably installed in an inner cavity of the quantitative input cylinder, a spiral blade fixedly installed on the surface of a rod body of the driving rod is arranged in the inner cavity of the quantitative input cylinder, the top wall of one end of the quantitative input cylinder communicates with a feeding box, and an anti-blocking mechanism is arranged at the bottom of the quantitative input cylinder. According to the utility model, a passivator from the passivator storage box is added into the quantitative input cylinder through the feeding box, and the passivator can be quantitatively added into the reaction kettle under the action of the spiral blade, so that the passivator is added to react with vanadium impurities to generate a stable compound, the erosion of the passivator to a catalyst is reduced, and the service life of the catalyst is prolonged. And the service life of the catalyst is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of heavy oil catalytic cracking reactors, specifically a circulating heavy oil catalytic cracking reactor using a cold regeneration catalyst. Background Technology

[0002] Catalytic cracking is one of the most important processes in secondary petroleum processing. In heavy oil catalytic cracking, vanadium is typically present in the heavy oil feedstock, especially in the residue from high-sulfur crude oil. During catalytic cracking, vanadium deposits on the catalyst surface, leading to catalyst poisoning, reduced activity and selectivity, increased coke and gas production, and decreased yields of high-value products such as gasoline. Furthermore, vanadium can have synergistic effects with other metals (such as nickel and iron), exacerbating catalyst deactivation. Therefore, removing vanadium impurities is crucial for maintaining catalyst life and the economic efficiency of heavy oil catalytic cracking units.

[0003] Chinese Patent Publication No. CN208136168U discloses a circulating heavy oil catalytic cracking reactor using a cold-regenerated catalyst. The reactor includes a reactor, a riser, a mixing tank, a baffle plate, a catalyst injection pipe, a stirring motor, a connecting pipe, a cooler, a fluidizing ring, and a centrifuge. An inlet is located at the top of the reactor. A centrifuge is installed on one side of the reactor, and the other side of the reactor is connected to the cooler via a discharge pipe. A fluidizing ring is installed at the bottom of the cooler and is connected to the mixing tank via a connecting pipe. A baffle plate is fixedly installed in the middle of the mixing tank. One side wall of the mixing tank is fixedly connected to the catalyst injection pipe, and the bottom of the other side of the mixing tank is connected to the reactor interior via a riser. The beneficial effects of this invention are: it greatly improves the utilization rate of heavy oil; the cooled regenerated catalyst is mixed with the newly injected regenerated catalyst and then reintroduced into the reactor for catalytic action, thus improving catalytic efficiency.

[0004] However, the reactor disclosed in the above patent still has certain shortcomings in the process of heavy oil catalytic cracking. It does not have the function of removing vanadium impurities present in the heavy oil feedstock, which causes vanadium impurities to deposit on the catalyst surface, resulting in catalyst poisoning, reduced activity and selectivity, and thus affecting the service life of the catalyst. Summary of the Invention

[0005] The purpose of this invention is to provide a circulating heavy oil catalytic cracking reactor that uses a cold regeneration catalyst, in order to solve the problem mentioned in the background art that the existing circulating heavy oil catalytic cracking reactors do not have the function of removing vanadium impurities present in the heavy oil feedstock, which affects the service life of the catalyst.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a circulating heavy oil catalytic cracking reactor using a cold regeneration catalyst, comprising a reactor base and a reaction vessel and a control box respectively fixed to the top walls on both sides of the reactor base. A passivating agent storage box is fixedly installed on one side of the top wall of the control box. A metering input cylinder is provided on the top of the reaction vessel. A drive rod is rotatably installed in the inner cavity of the metering input cylinder. One end of the drive rod extends to the outside of the metering input cylinder. A helical blade is fixedly installed on the surface of the drive rod in the inner cavity of the metering input cylinder. A feeding cylinder is connected to the bottom wall of one end of the metering input cylinder. The bottom end of the feeding cylinder is connected to the inner cavity of the reaction vessel. A motor is connected to one end of the drive rod. A feeding box is connected to the top wall of one end of the metering input cylinder. An anti-clogging mechanism is provided at the bottom of the metering input cylinder.

[0007] Preferably, the anti-clogging mechanism includes a fixing block fixedly installed on the bottom wall of the quantitative input cylinder, and a transmission rod is installed through the body of the fixing block via a bearing. One end of the transmission rod passes through the wall of the feeding cylinder via a bearing and extends into the inner cavity of the feeding cylinder.

[0008] Preferably, the anti-clogging mechanism further includes an eccentric cam fixedly installed at the end of the transmission rod, the eccentric cam being located in the inner cavity of the feed cylinder, a second gear being fixedly installed at the other end of the transmission rod, and a first gear meshing with the second gear being fixedly installed at one end of the drive rod.

[0009] Preferably, four fixing plates are fixedly installed on the top wall of the reactor, and the top part of the fixing plates is fixedly connected to the bottom outer wall of the metering input cylinder.

[0010] Preferably, a support base is fixedly installed on the top wall of the control box, and the motor is fixed to the top wall of the support base.

[0011] Preferably, support rods are fixedly installed at the four corners of the bottom wall of the reactor and the control box.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention features a passivating agent storage box on the top wall of the control box. During the catalytic cracking reaction of circulating heavy oil in the reactor, passivating agent from the storage box is added to the metering cylinder via a feeding box. A motor drives a rotating drive rod, and the helical blades and the feeding cylinder ensure that the passivating agent is metered into the reactor. This passivating agent reacts with vanadium impurities to form stable compounds, reducing their erosion of the catalyst and extending its lifespan. Furthermore, the transmission between the first and second gears causes the rotating drive rod to rotate, which in turn causes the transmission rod to rotate, leading to the rotation of an eccentric cam in the feeding cylinder. During rotation, the eccentric cam disperses the falling passivating agent, preventing blockage during feeding. Attached Figure Description

[0014] Figure 1 This is a first-view structural schematic diagram of a circulating heavy oil catalytic cracking reactor using a cold regeneration catalyst according to this utility model.

[0015] Figure 2 This is a partial cross-sectional view of the structure of a circulating heavy oil catalytic cracking reactor using a cold regeneration catalyst according to the present invention.

[0016] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A;

[0017] Figure 4 This is a partial structural diagram of the drive rod of a circulating heavy oil catalytic cracking reactor using a cold regeneration catalyst, according to this utility model.

[0018] In the diagram: 1. Reactor base; 2. Reactor vessel; 3. Control box; 4. Passivating agent storage box; 5. Quantitative input cylinder; 6. Feeding box; 7. Support base; 8. Motor; 9. Drive rod; 10. First gear; 11. Transmission rod; 12. Second gear; 13. Support rod; 14. Fixing plate; 15. Feeding cylinder; 16. Spiral blade; 17. Fixing block; 18. Eccentric cam. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 This utility model provides a technical solution: a circulating heavy oil catalytic cracking reactor using a cold regeneration catalyst, comprising a reactor base 1, a reaction vessel 2 and a control box 3 respectively fixed to the top walls of the left and right sides of the reactor base 1, a passivating agent storage box 4 welded to the rear top wall of the control box 3, and a passivating agent, such as an antimony-based, tin-based or bismuth-based compound, contained in the passivating agent storage box 4. A metering input cylinder 5 is located on top of the reaction vessel 2, and a drive rod 9 is rotatably installed in the inner cavity of the metering input cylinder 5. The left end of the drive rod 9 is mounted on the left side wall of the inner cavity of the metering input cylinder 5 via a bearing, and the right end of the drive rod 9 passes through the right side wall of the metering input cylinder 5 via a bearing. The right end of the drive rod 9 extends to the outside of the metering input cylinder 5. A spiral blade 16 welded to the surface of the drive rod 9 is provided in the inner cavity of the metering input cylinder 5. A feed cylinder 15 is connected to the bottom wall of the left end of the metering input cylinder 5, and the bottom end of the feed cylinder 15 is connected to the inner cavity of the reaction vessel 2. The right end of the drive rod 9 is connected to the motor 8 via a coupling. The top wall of the right end of the quantitative input cylinder 5 is connected to the feeding box 6. The bottom of the quantitative input cylinder 5 is equipped with an anti-clogging mechanism.

[0021] The anti-clogging mechanism includes a fixing block 17 welded to the bottom wall of the metering input cylinder 5. A transmission rod 11 is mounted on the body of the fixing block 17 via a bearing. The left end of the transmission rod 11 passes through the wall of the feeding cylinder 15 via a bearing and extends into the inner cavity of the feeding cylinder 15. The anti-clogging mechanism also includes an eccentric cam 18 welded to the left end of the transmission rod 11, located within the inner cavity of the feeding cylinder 15. A second gear 12 is welded to the right end of the transmission rod 11. A first gear 10, meshing with the second gear 12, is welded to the right end of the drive rod 9. This is to allow the drive rod 9 to rotate, causing the transmission rod 11 to rotate as well. Four fixing plates 14 are welded to the top wall of the reactor 2. The top ends of the fixing plates 14 are welded to the bottom outer wall of the metering input cylinder 5, providing stable support for the metering input cylinder 5. A support base 7 is welded to the top wall of the control box 3, and the motor 8 is fixed to the top wall of the support base 7 with screws. Support rods 13 are welded at the four corners of the bottom wall of the reactor 2 and the control box 3 to provide stable support for the reactor 2 and the control box 3.

[0022] In operation, a passivating agent storage box 4 is installed on the top wall of the control box 3 to store the passivating agent. When the reactor 2 is carrying out the circulating heavy oil catalytic cracking reaction, the passivating agent from the passivating agent storage box 4 can be added to the metering input cylinder 5 through the feeding box 6. Under the action of the motor 8, the drive rod 9 is rotated. Under the action of the spiral blade 16 and the feeding cylinder 15, the passivating agent can be metered into the reactor 2. By adding the passivating agent, it reacts with vanadium impurities to generate stable compounds, reducing their corrosion of the catalyst and helping to extend the service life of the catalyst. Under the transmission action of the first gear 10 and the second gear 12, the rotating drive rod 9 drives the transmission rod 11 to rotate together, which in turn drives the eccentric cam 18 located in the feeding cylinder 15 to rotate together. During the rotation, the eccentric cam 18 can shake and disperse the falling passivating agent to avoid blockage during the feeding process.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A circulating heavy oil catalytic cracking reactor using a cold-regenerated catalyst, comprising a reactor base (1) and a reaction vessel (2) and a control box (3) respectively fixed to the top walls on both sides of the reactor base (1), characterized in that: A passivating agent storage box (4) is fixedly installed on one side of the top wall of the control box (3). A quantitative input cylinder (5) is provided on the top of the reactor (2). A drive rod (9) is rotatably installed in the inner cavity of the quantitative input cylinder (5). One end of the drive rod (9) extends to the outside of the quantitative input cylinder (5). A spiral blade (16) is fixedly installed on the surface of the drive rod (9) in the inner cavity of the quantitative input cylinder (5). A feeding cylinder (15) is connected to the bottom wall of one end of the quantitative input cylinder (5). The bottom end of the feeding cylinder (15) is connected to the inner cavity of the reactor (2). A motor (8) is connected to one end of the drive rod (9). A feeding box (6) is connected to the top wall of one end of the quantitative input cylinder (5). An anti-clogging mechanism is provided at the bottom of the quantitative input cylinder (5).

2. The circulating heavy oil catalytic cracking reactor using a cold-regenerated catalyst according to claim 1, characterized in that: The anti-clogging mechanism includes a fixed block (17) fixedly installed on the bottom wall of the quantitative input cylinder (5). The body of the fixed block (17) is connected to a transmission rod (11) through a bearing. One end of the transmission rod (11) is connected to the wall of the feed cylinder (15) through a bearing and extends into the inner cavity of the feed cylinder (15).

3. The circulating heavy oil catalytic cracking reactor using a cold-regenerated catalyst according to claim 2, characterized in that: The anti-clogging mechanism also includes an eccentric cam (18) fixedly installed at the end of the transmission rod (11). The eccentric cam (18) is located in the inner cavity of the feed cylinder (15). A second gear (12) is fixedly installed at the other end of the transmission rod (11). A first gear (10) that meshes with the second gear (12) is fixedly installed at one end of the drive rod (9).

4. The circulating heavy oil catalytic cracking reactor using a cold-regenerated catalyst according to claim 1, characterized in that: The top wall of the reactor (2) is fixedly equipped with four fixing plates (14), and the top of the fixing plates (14) is fixedly connected to the bottom outer wall of the quantitative input cylinder (5).

5. The circulating heavy oil catalytic cracking reactor using a cold-regenerated catalyst according to claim 1, characterized in that: The top wall of the control box (3) is fixedly equipped with a support base (7), and the motor (8) is fixed to the top wall of the support base (7).

6. The circulating heavy oil catalytic cracking reactor using a cold-regenerated catalyst according to claim 1, characterized in that: Support rods (13) are fixedly installed at the four corners of the bottom wall of the reactor (2) and the control box (3).

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