Long-period operation system for atmospheric tower of boiling bed residual oil hydrocracking unit

Abstract

The utility model provides an atmospheric tower long-period operation system of a boiling bed residual oil hydrocracking unit. The atmospheric tower long-period operation system comprises an atmospheric tower and a reflux pipeline, a second side line outlet of the atmospheric tower is connected to a first inlet of the atmospheric tower through a reflux pipeline, and the reflux pipeline is sequentially connected with a reflux pipeline valve, a first pump inlet filter, a first reflux pump, a reflux flowmeter and a reflux valve group; the reflux pipeline is connected with an external reflux pipeline, the inlet end of the external reflux pipeline is connected to a front path of the reflux valve group, and the outlet end of the external reflux pipeline is connected to a No.2 inlet of the atmospheric tower; the external reflux pipeline is sequentially connected with an external reflux flowmeter and an external reflux valve group; the washing effect of the lower tray of the atmospheric tower can be improved, and the product quality is ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of fluidized bed residue oil hydrogenation process, and in particular, it is a long-cycle operation system for the atmospheric tower of a fluidized bed residue oil hydrocracking unit. Background Technology

[0002] In recent years, with the increasing trend of heavy and inferior crude oil, the growing market demand for light oil products, and increasingly stringent environmental regulations, the efficient conversion and clean utilization of heavy oil, especially residue oil, has become a focus of the global refining industry. The fluidized bed residue hydrotreating process, with its advantages of a wide range of feedstocks, low reactor pressure drop, and good heat and mass transfer, has gained increasing recognition from major refineries. However, due to the poor properties of the feedstocks, high operating temperatures, and high conversion rates, a series of problems such as coking and blockage of equipment and pipelines can occur during operation. Among these, coking and blockage at the bottom of the atmospheric distillation tower and high asphaltenes content in atmospheric wax oil have become major problems limiting the long-term, safe, and stable operation of fluidized bed residue hydrotreating units. Utility Model Content

[0003] In view of the above problems, the purpose of this application is to provide a long-cycle operation system for the atmospheric tower of a fluidized bed residue hydrocracking unit, so as to improve the washing effect of the lower tray of the atmospheric tower and ensure product quality.

[0004] To achieve some or all of the above objectives or other objectives, this application provides the following technical solution: a long-cycle operation system for an atmospheric pressure tower in a fluidized bed residue hydrocracking unit, comprising an atmospheric pressure tower and a reflux pipeline; the second outlet of the atmospheric pressure tower is connected to the first inlet of the atmospheric pressure tower via the reflux pipeline, and the reflux pipeline is sequentially connected to a reflux pipeline valve, a first pump inlet filter, a first reflux pump, a reflux flow meter, and a reflux valve assembly; an external reflux pipeline is connected to the reflux pipeline, the inlet end of the external reflux pipeline is connected to the front of the reflux valve assembly, and the outlet end of the external reflux pipeline is connected to the second inlet of the atmospheric pressure tower; an external reflux flow meter and an external reflux valve assembly are sequentially connected to the external reflux pipeline.

[0005] Furthermore, a filter branch line is connected to the return pipeline, the inlet end of the filter branch line is connected to the front of the inlet filter of the first pump, and the outlet end of the filter branch line is connected to the rear of the first return pump; the filter branch line is sequentially connected to the inlet filter of the second pump and the second return pump.

[0006] Furthermore, the return pipeline is connected to the extraction pipeline, the inlet end of the extraction pipeline is connected to the front of the valve in the return pipeline, and the outlet end of the extraction pipeline is connected to the product tower; the extraction pipeline is sequentially connected to a first double valve, a first extraction filter, a second double valve, and an extraction flow meter.

[0007] Furthermore, the extraction pipeline is connected to an extraction branch pipeline, the inlet end of which is connected to the front of the No. 1 double valve, and the outlet end of which is connected to the rear of the No. 2 double valve; the No. 3 double valve, the No. 2 extraction filter, and the No. 4 double valve are connected sequentially on the extraction branch pipeline.

[0008] Furthermore, a second return pipeline is connected to the return pipeline, and the inlet end of the second return pipeline is connected to the downstream path of the return flow meter.

[0009] Furthermore, the reflux valve assembly includes a first valve and a second valve, which are sequentially connected to the reflux pipeline; the reflux valve assembly also includes a first branch pipeline, the inlet end of which is connected between the first valve and the second valve, and the outlet end of which is connected to a third valve.

[0010] Furthermore, the external reflux valve assembly includes valve number four and valve number five, which are sequentially connected to the external reflux pipeline; the external reflux valve assembly also includes a branch pipeline number two, the inlet end of which is connected between valve number four and valve number five, and the outlet end of which is connected to valve number six.

[0011] Furthermore, layers 36-38 of the atmospheric pressure tower are herringbone trays, and layers 30-35 of the atmospheric pressure tower are solid valve trays.

[0012] Furthermore, the outlet end of the external reflux pipeline is connected between the 35th and 36th layers of the atmospheric pressure tower.

[0013] Compared with the prior art, the beneficial effects of this utility model are: the atmospheric pressure tower layers 36-38 are designed as herringbone trays, the atmospheric pressure tower layers 30-35 are designed as solid valve trays, and an external reflux pipeline is added to the top of layer 36 to improve the washing effect of the lower trays of the atmospheric pressure tower and ensure product quality. Attached Figure Description

[0014] Figure 1 This is a flowchart of the present invention;

[0015] In the diagram: 1. Atmospheric pressure tower; 2. Reflux line; 3. Reflux pump No. 1; 4. Reflux valve assembly; 5. External reflux line; 6. External reflux flow meter; 7. External reflux valve assembly; 8. Extraction line; 9. Extraction flow meter; 10. Product tower; 11. Filter branch line; 12. Reflux pump No. 2; 13. Valve No. 1; 14. Valve No. 2; 15. Branch line No. 1; 16. Valve No. 3; 17. Valve No. 4; 18. 19. No. 5 valve, 20. No. 6 valve, 21. No. 1 pump inlet filter, 22. No. 2 pump inlet filter, 23. No. 1 extraction filter, 24. No. 2 extraction filter, 25. Return flow meter, 26. Return pipeline valve, 27. No. 1 double valve, 28. No. 2 double valve, 29. No. 3 double valve, 30. No. 4 double valve, 31. Extraction branch pipeline, 32. No. 2 return pipeline. 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.

[0017] See appendix Figure 1 A long-cycle operation system for an atmospheric distillation tower in a fluidized bed residue hydrocracking unit includes an atmospheric distillation tower 1 and a reflux pipeline 2. The second outlet of the atmospheric distillation tower 1 is connected to the first inlet of the atmospheric distillation tower 1 via the reflux pipeline 2. A reflux pipeline valve 26, a first pump inlet filter 21, a first reflux pump 3, a reflux flow meter 25, and a reflux valve assembly 4 are sequentially connected to the reflux pipeline 2. An external reflux pipeline 5 is connected to the reflux pipeline 2. The inlet end of the external reflux pipeline 5 is connected to the front of the reflux valve assembly 4, and the outlet end of the external reflux pipeline 5 is connected to the second inlet of the atmospheric distillation tower 1. An external reflux flow meter 6 and an external reflux valve assembly 7 are sequentially connected to the external reflux pipeline 5.

[0018] The return line 2 is connected to the filter branch line 11. The inlet end of the filter branch line 11 is connected to the front of the inlet filter 21 of the first pump, and the outlet end of the filter branch line 11 is connected to the rear of the first return pump 3. The filter branch line 11 is connected in sequence to the inlet filter 22 of the second pump and the second return pump 12.

[0019] The return line 2 is connected to the extraction line 8. The inlet end of the extraction line 8 is connected to the front of the return line valve 26, and the outlet end of the extraction line 8 is connected to the product tower 10. The extraction line 8 is connected in sequence to 27, extraction filter 23, double valve 28, and extraction flow meter 9.

[0020] The extraction pipeline 8 is connected to the extraction branch pipeline 31. The inlet end of the extraction branch pipeline 31 is connected to the front of the first double valve 27, and the outlet end of the extraction branch pipeline 31 is connected to the rear of the second double valve 28. The extraction branch pipeline 31 is connected in sequence to the third double valve 29, the second extraction filter 24, and the fourth double valve 30.

[0021] The return line 2 is connected to the second return line 32, and the inlet end of the second return line 32 is connected to the downstream path of the return flow meter 25.

[0022] The reflux valve assembly 4 includes a first valve 13 and a second valve 14, which are sequentially connected to the reflux line 2. The reflux valve assembly 4 also includes a first branch line 15, the inlet end of which is connected between the first valve 13 and the second valve 14, and the outlet end of which is connected to the third valve 16.

[0023] The external return valve assembly 7 includes valve 17 (number 4) and valve 18 (number 5), which are sequentially connected to the external return pipeline 5. The external return valve assembly 7 also includes branch pipeline 19 (number 2), whose inlet end is connected between valve 17 and valve 18, and whose outlet end is connected to valve 20 (number 6).

[0024] The trays are arranged from top to bottom; the atmospheric pressure tower has herringbone trays in layers 36-38, and solid valve trays in layers 30-35.

[0025] The outlet end of the external reflux pipeline 5 is connected between the 35th and 36th layers of the atmospheric pressure tower 1.

[0026] 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. A long-cycle operation system for an atmospheric pressure tower in a fluidized bed residue hydrocracking unit, characterized in that: It includes an atmospheric pressure tower (1) and a reflux line (2); the second outlet of the atmospheric pressure tower (1) is connected to the first inlet of the atmospheric pressure tower (1) through the reflux line (2), and the reflux line (2) is connected in sequence to the reflux line valve (26), the first pump inlet filter (21), the first reflux pump (3), the reflux flow meter (25) and the reflux valve group (4); the reflux line (2) is connected to an external reflux line (5), the inlet end of the external reflux line (5) is connected to the front of the reflux valve group (4), and the outlet end of the external reflux line (5) is connected to the second inlet of the atmospheric pressure tower (1); the external reflux line (5) is connected in sequence to the external reflux flow meter (6) and the external reflux valve group (7).

2. The long-cycle operation system of the atmospheric pressure tower of a fluidized bed residue hydrocracking unit according to claim 1, characterized in that: The return line (2) is connected to the filter branch line (11). The inlet end of the filter branch line (11) is connected to the front of the first pump inlet filter (21), and the outlet end of the filter branch line (11) is connected to the rear of the first return pump (3). The filter branch line (11) is connected to the second pump inlet filter (22) and the second return pump (12) in sequence.

3. The long-cycle operation system of the atmospheric pressure tower of a fluidized bed residue hydrocracking unit according to claim 1, characterized in that: The return line (2) is connected to the extraction line (8). The inlet end of the extraction line (8) is connected to the front of the return line valve (26), and the outlet end of the extraction line (8) is connected to the product tower (10). The extraction line (8) is connected in sequence to the first double valve (27), the first extraction filter (23), the second double valve (28), and the extraction flow meter (9).

4. The long-cycle operation system of the atmospheric pressure tower of a fluidized bed residue hydrocracking unit according to claim 3, characterized in that: The extraction pipeline (8) is connected to the extraction branch pipeline (31). The inlet end of the extraction branch pipeline (31) is connected to the front of the first double valve (27), and the outlet end of the extraction branch pipeline (31) is connected to the rear of the second double valve (28). The extraction branch pipeline (31) is connected in sequence to the third double valve (29), the second extraction filter (24), and the fourth double valve (30).

5. The long-cycle operation system of the atmospheric pressure tower of a fluidized bed residue hydrocracking unit according to claim 1, characterized in that: The return line (2) is connected to the second return line (32), and the inlet end of the second return line (32) is connected to the downstream path of the return flow meter (25).

6. The long-cycle operation system of the atmospheric pressure tower of a fluidized bed residue hydrocracking unit according to claim 1, characterized in that: The reflux valve group (4) includes a first valve (13) and a second valve (14), which are connected sequentially to the reflux line (2); the reflux valve group (4) also includes a first branch line (15), the inlet end of which is connected between the first valve (13) and the second valve (14), and the outlet end of which is connected to the third valve (16).

7. The long-cycle operation system of the atmospheric pressure tower of a fluidized bed residue hydrocracking unit according to claim 1, characterized in that: The external return valve assembly (7) includes valve No. 4 (17) and valve No. 5 (18), which are connected sequentially to the external return pipeline (5); the external return valve assembly (7) also includes branch pipeline No. 2 (19), the inlet end of which is connected between valve No. 4 (17) and valve No. 5 (18), and the outlet end of which is connected to valve No. 6 (20).

8. The long-cycle operation system of the atmospheric pressure tower of a fluidized bed residue hydrocracking unit according to claim 1, characterized in that: The atmospheric pressure tower has herringbone trays on layers 36-38, and solid valve trays on layers 30-35.

9. The long-cycle operation system of the atmospheric pressure tower of a fluidized bed residue hydrocracking unit according to claim 1, characterized in that: The outlet end of the external reflux line (5) is connected between the 35th and 36th layers of the atmospheric pressure tower (1).

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