Reforming continuous regeneration unit dust recovery system

Abstract

The utility model belongs to the technical field of continuous reforming units, and particularly relates to a dust recovery system of a reforming continuous regeneration unit, which is characterized in that a lower hopper for containing a catalyst is arranged below a tail end reactor of the reforming regeneration unit, and a first nitrogen pipeline is connected above the lower hopper to carry out nitrogen sealing on the lower hopper; the bottom of the lower hopper is connected to a reactor lifter through a material returning pipeline, the reactor lifter is connected with a second nitrogen pipeline, the upper part of the reactor lifter is connected with a catalyst lifting pipeline, and an outlet of the catalyst lifting pipeline is connected into the regenerator; the material returning pipeline is connected with an inclined filter inlet pipeline, the filter inlet pipeline is connected with a filter used for separating gas and metal powder, and the filter is connected to the catalyst lifting pipeline through an emptying pipeline; and the filter and the Johnson screen are connected in the material returning pipeline, and part of catalyst metal powder is separated and recycled behind the tail-end reactor, so that the loss of platinum dust is avoided, and the oil quality is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of continuous reforming units of chemical plants, and in particular relates to a dust recovery system for a reforming continuous regeneration unit. Background Art

[0002] During the circulation process in the reactor of the reforming continuous regeneration unit, the catalyst is a round particle containing platinum and has fluidity. Through high-temperature catalytic reaction, carbon deposits are generated on the surface area. In order to ensure the activity of the catalyst, the carbon deposits need to be burned at a high temperature of more than 400 degrees, oxychlorinated (water and chlorine injection to maintain water-chlorine balance), roasted (burned dry), regenerated and reduced (reduced metal properties at high temperature with pure hydrogen), and then circulated in four reactors in turn. During the circulation process, a large amount of friction is generated with the catalyst mesh, generating dust, and platinum metal is contained in the dust. The dust is lost through the gap of the catalyst mesh into the oil, causing the loss of platinum metal. The regeneration unit has a dust recovery system. As the catalyst runs for a long time, the crushing strength decreases, resulting in more and more dust. A dust recovery system cannot completely recover the dust, and the catalyst dust loss phenomenon can still be found in the downstream oil products. Summary of the invention

[0003] In view of the defects of the prior art mentioned above, the purpose of the utility model is to provide a dust recovery system for a reforming continuous regeneration unit, so as to avoid the loss of catalyst dust and recover more catalyst dust.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a dust recovery system for a reforming continuous regeneration unit, wherein a lower hopper for holding a catalyst is arranged below the terminal reactor of the reforming regeneration unit, a first nitrogen pipeline is connected to the upper part of the lower hopper to nitrogen-seal the lower hopper, the bottom of the lower hopper is connected to a reactor lifter through a material withdrawal pipeline, the reactor lifter is connected to a second nitrogen pipeline, the upper part of the reactor lifter is connected to a catalyst lifting pipeline, the outlet of the catalyst lifting pipeline is connected to the regenerator; an inclined filter inlet pipeline is connected to the material withdrawal pipeline, the filter inlet pipeline is connected to a filter for separating gas and metal powder, the filter is connected to the catalyst lifting pipeline through a venting pipeline; a Johnson net is arranged at the interface connecting the filter inlet pipeline in the material withdrawal pipeline.

[0005] Furthermore, the filter inlet pipeline is arranged obliquely from top to bottom along the flow direction of the metal powder, and a double valve group is arranged on the filter inlet pipeline.

[0006] Furthermore, a dust discharge port is provided at the bottom of the filter.

[0007] Furthermore, a vent valve is provided on the vent pipeline.

[0008] Furthermore, the catalyst lifting pipeline is arranged to be inclined from bottom to top along the catalyst flow direction.

[0009] Furthermore, the material return pipeline is arranged longitudinally, and a material return valve is arranged on the material return pipeline, and the material return valve is arranged at the inlet front of the filter inlet pipeline.

[0010] Furthermore, the second nitrogen pipeline is connected to the reactor riser through two branches, and each branch is provided with a control valve.

[0011] Furthermore, the pressure of the first nitrogen pipeline is 0.8 MPa, and the pressure of the second nitrogen pipeline is 0.4 MPa.

[0012] Furthermore, the catalyst enters the terminal reactor from the lower hopper of the previous reactor through the upper hopper of the terminal reactor.

[0013] Furthermore, the feed pipeline of the terminal reactor is connected to the top inlet of the terminal reactor via the outlet of the heating furnace, and the bottom outlet of the terminal reactor is connected to the reforming plate heat exchanger via the discharge pipeline.

[0014] Furthermore, the reforming and regeneration unit has four-stage reactors, and the return pipeline of the lower hopper of the fourth reforming reactor is connected with an inclined filter inlet pipeline and a filter.

[0015] The beneficial effects of the utility model are as follows: the dust recovery system of the reforming continuous regeneration unit of the utility model connects a filter and a Johnson net on the catalyst withdrawal line of the terminal reactor, separates part of the catalyst metal powder for recovery, reduces the recovery pressure of the subsequent dust recovery system, avoids the loss of platinum dust and ensures the quality of downstream oil products. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the process flow chart of the dust recovery system of the reforming continuous regeneration unit of the utility model;

[0017] In the figure: 1, reforming fourth reactor, 2, reforming fourth reactor lower hopper, 3, first nitrogen pipeline, 4, withdrawal pipeline, 5, reforming fourth reactor riser, 6, second nitrogen pipeline, 7, catalyst lifting pipeline, 8, filter inlet pipeline, 9, filter inlet double valve group, 10, filter, 11, venting pipeline, 12, Johnson net, 13, withdrawal valve, 14, control valve, 15, reforming fourth reactor upper hopper, 16, reforming fourth reactor inlet heating furnace, 17, dust unloading port, 18 venting valve;

[0018] A. Regenerator, B. Lower hopper of the third reforming reactor, C. Reforming plate heat exchanger. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0020] See attached Figure 1 , a reforming continuous regeneration unit dust recovery system, the reforming regeneration unit has a total of four reactors, the four reactors are heated by a heating furnace, the reactions are all synchronous, a reforming fourth reactor lower hopper 2 for holding a catalyst is arranged below the terminal fourth reactor 1, the upper part of the reforming fourth reactor lower hopper 2 is connected to a first nitrogen pipeline 3 with a pressure of 0.8Mpa to nitrogen seal the lower hopper 2 of the fourth reactor, the bottom of the reforming fourth reactor lower hopper 2 is connected to the reforming fourth reactor riser 5 through a material return pipeline 4, the reforming fourth reactor riser 5 is connected to a second nitrogen pipeline 6 with a pressure of 0.4Mpa, the upper part of the reforming fourth reactor riser 5 is connected to a catalyst lifting pipeline 7, the catalyst lifting pipeline 7 is connected along the catalyst The flow direction of the catalyst is inclined from bottom to top, and the outlet of the catalyst lifting pipeline 7 is connected to the regenerator; the return pipeline 4 is connected with an inclined filter inlet pipeline 8, and the filter inlet pipeline 8 is inclined from top to bottom along the flow direction of the metal powder, so that the platinum powder can fall along the direction of nitrogen. The filter inlet pipeline 8 is provided with a filter inlet double valve group 9, and the filter inlet pipeline 8 is connected with a filter 10 for separating gas and metal powder. The top of the filter 10 sends the gas to the catalyst lifting pipeline 7 through the venting pipeline 11, and the venting pipeline 11 is provided with a vent valve 18. The bottom of the filter is provided with a dust unloading port 17 to recover the platinum powder; the return pipeline 4 is provided with a Johnson net 12 at the interface connected to the filter inlet pipeline 8. The filter 10 can adopt the non-standard customized Y-type sewage dust filter of Shanghai Hanyue Valve Co., Ltd., or other types of commercially available filters that can realize the functions of this system.

[0021] Furthermore, the material return pipeline 4 is arranged longitudinally, and a material return valve 13 is arranged on the material return pipeline 4 , and the material return valve 13 is arranged at the inlet front of the filter inlet pipeline 8 .

[0022] Furthermore, the second nitrogen pipeline 6 is connected to the reforming fourth reactor riser 5 through two branches, and a control valve 14 is respectively provided on each branch.

[0023] Furthermore, the catalyst of the fourth reforming reactor 1 enters the fourth reforming reactor 1 from the lower hopper of the third reforming reactor through the upper hopper 15 of the fourth reforming reactor.

[0024] Furthermore, the reaction materials of the inlet pipeline of the fourth reforming reactor 1 are heated by the fourth reforming reactor inlet heating furnace 16 and then sent to the top inlet of the fourth reforming reactor 1, and the bottom outlet of the fourth reforming reactor 1 is connected to the reforming plate heat exchanger through the discharge pipeline.

[0025] The dust recovery system transforms the return pipeline 4 of the lower hopper 2 of the fourth reforming reactor into an oblique tee, and adds a Johnson net at one end of the straight pipe mouth. When the catalyst flows through the tee, the intact catalyst will fall normally into the fourth reforming reactor lifter 5, and the catalyst will be transported to the regenerator for regeneration by the lifting nitrogen of the second nitrogen pipeline 6 at the bottom. The dust entrained in the catalyst will be sent to the filter 10, and the gas will meet the catalyst lifting pipeline 7 through the venting pipeline 11 from the bottom of the filter. The return pipeline 4 and the catalyst lifting pipeline 7 form a pressure difference, driving the dust into the filter. When a certain amount of dust accumulates, the filter inlet double valve group 9 is closed, the outlet double valves are closed, and the dust unloading port 17 is slowly opened to discharge the dust into the recovery barrel for recovery. There is a dust recovery system in the prior art. As the catalyst runs for a long time, the crushing strength decreases, resulting in more and more dust, and a dust recovery system cannot be completely recovered. Catalyst dust loss can still be found in downstream oil products. The technical solution of the utility model cannot completely recover the platinum powder, but it can partially separate and recover the platinum powder in the catalyst before the catalyst enters the regeneration system without changing the original operating route of the catalyst, thereby effectively reducing the pressure on the dust recovery system in the regeneration unit.

[0026] There are four reactors in total for reforming, and the catalyst at the end is also the most seriously worn, so the dust recovery system of this embodiment is installed at the outlet of the fourth reactor. Compared with adding a set or expanding the dust collector system in the system, which requires the entire device to be shut down for construction and is expensive, the cost of transformation is higher than the lost platinum dust. This invention can shut down the regeneration alone without affecting the normal operation of other units, and the construction is simple and the investment is low.

[0027] The present invention does not disclose some common knowledge in the art.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] The above examples are only the best embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations. All variations that can be directly derived or associated with the contents disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A reforming continuous regeneration unit dust recovery system, characterized in that: A lower hopper for holding catalyst is arranged below the terminal reactor of the reforming and regeneration unit, a first nitrogen pipeline is connected to the upper part of the lower hopper to nitrogen-seal the lower hopper, a bottom of the lower hopper is connected to the reactor lifter through a material withdrawal pipeline, the reactor lifter is connected to a second nitrogen pipeline, the upper part of the reactor lifter is connected to a catalyst lifting pipeline, the outlet of the catalyst lifting pipeline is connected to the regenerator; an inclined filter inlet pipeline is connected to the material withdrawal pipeline, a filter for separating gas and metal powder is connected to the filter inlet pipeline, the filter is connected to the catalyst lifting pipeline through a venting pipeline; a Johnson net is arranged at the interface of the material withdrawal pipeline connected to the filter inlet pipeline.

2. A reforming continuous regeneration unit dust recovery system according to claim 1, characterized in that: The filter inlet pipeline is arranged obliquely from top to bottom along the flow direction of the metal powder, and a double valve group is arranged on the filter inlet pipeline; a dust discharge port is arranged at the bottom of the filter.

3. A reforming continuous regeneration unit dust recovery system according to claim 1, characterized in that: The first nitrogen pipeline pressure is 0.8 MPa.

4. A reforming continuous regeneration unit dust recovery system according to claim 1, characterized in that: The vent pipeline is provided with a vent valve.

5. The dust recovery system of the reforming continuous regeneration unit according to claim 1 is characterized in that: The catalyst lifting pipeline is arranged inclined from bottom to top along the catalyst flow direction.

6. A reforming continuous regeneration unit dust recovery system according to claim 1, characterized in that: The material return pipeline is arranged longitudinally, and a material return valve is arranged on the material return pipeline, and the material return valve is arranged at the inlet front of the filter inlet pipeline.

7. The dust recovery system of the reforming continuous regeneration unit according to claim 1, characterized in that: The second nitrogen pipeline is connected to the reactor riser through two branches, and each branch is provided with a control valve; the pressure of the second nitrogen pipeline is 0.4Mpa.

8. The dust recovery system of the reforming continuous regeneration unit according to claim 1, characterized in that: The catalyst enters the terminal reactor from the lower hopper of the previous reactor through the upper hopper of the terminal reactor.

9. The dust recovery system of the reforming continuous regeneration unit according to claim 1, characterized in that: The feed pipeline of the terminal reactor is connected to the top inlet of the terminal reactor via the outlet of the heating furnace, and the bottom outlet of the terminal reactor is connected to the reforming plate heat exchanger via the discharge pipeline.

10. The dust recovery system of the reforming continuous regeneration unit according to claim 1, characterized in that: The reforming and regeneration unit has four-stage reactors, and a filter inlet pipeline and a filter which are arranged obliquely are connected to the material return pipeline of the lower hopper of the fourth reforming reactor.

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