Control system for separating heavy components and light components of naphtha

Abstract

The utility model relates to a system for cutting naphtha components in a reforming device, in particular to a control system for separating heavy components and light components of naphtha, which comprises a naphtha feeding unit, a pre-hydrogenation device and an aromatization separation tower unit, the aromatization separation tower unit is arranged in front of the pre-hydrogenation device, and the naphtha feeding unit is connected with the pre-hydrogenation device through a pipeline; the naphtha feeding unit is used for feeding materials to the system, the aromatization separation tower unit is used for cutting naphtha, then heavy naphtha components are returned to the pre-hydrogenation device, and light components are conveyed to a plant tank area and reach a wharf ship loading line; a set of tower separation system is additionally arranged in front of a pre-hydrogenation device, heavy components and light components are separated, and the purposes of enlarging loads, increasing operation flexibility and maximizing benefits are achieved; flexible application can be realized, and when market benefits are beneficial to processing of the full-fraction naphtha, the full-fraction naphtha can be completely processed.

Description

Technical Field

[0001] The utility model relates to a system for cutting naphtha components in a reforming device, in particular to a control system for separating naphtha heavy components and light components, and belongs to the field of petrochemical industry. Background Art

[0002] When the market price difference between full-fraction naphtha and heavy naphtha increases and the benefits of fully processing full-fraction naphtha are greater, full-fraction naphtha can be fully processed. Because the current aromatics unit cannot fully process full-fraction naphtha, it must be processed together with heavy naphtha in a certain proportion. Therefore, a tower separation system is added before the pre-hydrogenation system to achieve the purpose of cutting naphtha components. The heavy components are pre-hydrogenated and processed, and the light components are sold to maximize profits.

[0003] At present, when the reforming unit is in normal production, the pre-hydrogenation unit cannot process all the full-fraction naphtha, and the existing tower of the aromatization unit must be modified to separate the heavy components and light components. The existing device only increases the processing capacity of the tower in the existing pre-hydrogenation process to process full-fraction naphtha and heavy naphtha. Utility Model Content

[0004] In view of the above technical problems, the purpose of the utility model is to provide a control system for separating the heavy components and light components of naphtha. By adding a tower separation system before the pre-hydrogenation device, the heavy components and light components are separated, so as to expand the load, increase the operating flexibility and achieve the purpose of maximizing benefits.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: a control system for separating naphtha heavy components and light components, comprising: a naphtha feeding unit, a pre-hydrogenation device and an aromatization separation tower unit; an aromatization separation tower unit is arranged before the pre-hydrogenation device, and the naphtha feeding unit is connected to the pre-hydrogenation device through a pipeline; the system is fed through the naphtha feeding unit, and the heavy naphtha component is returned to the pre-hydrogenation device after the naphtha is cut by the aromatization separation tower unit, and the light component is sent to the plant tank area and reaches the dock loading line;

[0006] Furthermore, the naphtha feeding unit includes a wharf naphtha tank area and a naphtha storage tank; the material from the wharf naphtha tank area reaches the naphtha storage tank through a pipeline, and the naphtha storage tank is connected to the pre-hydrogenation device through a pipeline;

[0007] Furthermore, the aromatization separation tower unit comprises: a separation tower, a feed process arranged in the separation tower, a bottom discharge process of the separation tower and a top discharge process of the separation tower; the feed process of the separation tower is connected from the boundary position of the naphtha feeding unit, and is finally connected to the separation tower through the feed process of the separation tower through the feed pump at the front end of the separation tower;

[0008] Furthermore, the feed process of the separation tower includes: a first pipeline, a second pipeline and a third pipeline, a feed filter, and a feed heat exchanger; a control valve is arranged on the first pipeline and connected to the feed filter, the outlet end of the feed filter is connected to the feed heat exchanger through the second pipeline, and the bottom of the feed heat exchanger is connected to the separation tower through the third pipeline;

[0009] Furthermore, the first pipeline, the second pipeline and the third pipeline are all DN250 pipelines;

[0010] Furthermore, the bottom discharge process of the separation tower includes: a bottom extraction pump, a feed heat exchanger, and a cooler; the bottom discharge pipeline is led out from the outlet end of the bottom extraction pump, connected to the feed heat exchanger and then connected to the cooler, and the cooler is connected to the external equipment through a pipeline;

[0011] The tower bottom discharge pipeline includes a fourth pipe section from the outlet end of the tower bottom extraction pump to the feed heat exchanger, a fifth pipe section from the feed heat exchanger to the cooler, and a sixth pipe section from the cooler to the external equipment;

[0012] Furthermore, the fourth pipe section, the fifth pipe section and the sixth pipe section are all DN150 pipelines;

[0013] Furthermore, a control valve is provided at a position of the fourth pipe section close to the feed heat exchanger.

[0014] Furthermore, the top discharge process of the separation tower includes: a top extraction pump, an air cooler, a newly added discharge line, and a newly added heat exchanger; the top of the separation tower is connected to the air cooler through a pipeline, the air cooler is connected to the top extraction pump through a pipeline, the outlet end of the top extraction pump leads to a newly added discharge line and is connected to the newly added heat exchanger, the newly added heat exchanger is connected to the plant tank area through a pipeline after heat exchange, and the plant tank area is connected to the loading line through a newly added pipeline;

[0015] Furthermore, the newly added pipeline is a DN350 pipeline.

[0016] By adopting the above process, the aromatization separation tower is used to cut the naphtha, and the heavy naphtha after cutting is returned to the pre-hydrogenation unit; the top oil is sent to the plant tank area and sold as ethylene feedstock.

[0017] The utility model adds a tower separation system before the pre-hydrogenation system to achieve the purpose of separating the light components and heavy components of naphtha, so that the proportion of processed full-fraction naphtha is increased, the operation flexibility is increased, and the proportion of processed full-fraction naphtha can be adjusted according to the market prices of full-fraction naphtha and heavy naphtha to maximize profits.

[0018] The beneficial effects of the utility model are as follows: by adding a tower separation system before the pre-hydrogenation device, the heavy component and the light component are separated, so as to expand the load, increase the operation flexibility and achieve the purpose of maximizing benefits; flexible use can be achieved, and when the market benefits are conducive to processing full-fraction naphtha, all full-fraction naphtha can be processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model.

[0020] In the figure, 1, wharf naphtha tank area, 2, naphtha storage tank, 3, separation tower, 4, feed pump, 5, first pipeline, 6, second pipeline, 7, third pipeline, 8, feed filter, 9, feed heat exchanger, 10, bottom production pump, 11, cooler, 12, fourth pipe section, 13, fifth pipe section, 14, sixth pipe section, 15, top production pump, 16, air cooler, 17, newly added discharge line, 18, newly added heat exchanger, 19, plant tank area, 20, newly added pipeline. DETAILED DESCRIPTION

[0021] 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.

[0022] like Figure 1 The control system for separating heavy components and light components of naphtha shown in the figure comprises: a naphtha feeding unit, a pre-hydrogenation device and an aromatization separation tower unit; an aromatization separation tower unit is arranged before the pre-hydrogenation device, and the naphtha feeding unit is connected to the pre-hydrogenation device through a pipeline; the system is fed through the naphtha feeding unit, and the heavy naphtha component is returned to the pre-hydrogenation device after the naphtha is cut by the aromatization separation tower unit, and the light component is sent to the plant tank area 19 and reaches the dock loading line;

[0023] The naphtha feeding unit includes a wharf naphtha tank area 1 and a naphtha storage tank 2; the material from the wharf naphtha tank area 1 reaches the naphtha storage tank 2 through a pipeline, and the naphtha storage tank 2 is connected to the pre-hydrogenation device through a pipeline;

[0024] The aromatization separation tower unit comprises: a separation tower 3, a feed flow arranged in the separation tower 3, a bottom discharge flow of the separation tower 3 and a top discharge flow of the separation tower 3; the feed flow of the separation tower 3 is connected from the boundary position of the naphtha feeding unit, and is finally connected to the separation tower 3 through the feed flow of the separation tower 3 through the feed pump 4 at the front end of the separation tower 3;

[0025] The feed process of the separation tower includes: a first pipeline 5, a second pipeline 6 and a third pipeline 7, a feed filter 8, and a feed heat exchanger 9; a control valve is provided on the first pipeline 5 and connected to the feed filter 8, the outlet end of the feed filter 8 is connected to the feed heat exchanger 9 through the second pipeline 6, and the bottom of the feed heat exchanger 9 is connected to the separation tower 3 through the third pipeline 7;

[0026] The bottom discharge process of the separation tower 3 includes: a bottom extraction pump 10, a feed heat exchanger 9, and a cooler 11; the bottom discharge pipeline is led out from the outlet end of the bottom extraction pump 10, connected to the feed heat exchanger 9 and then connected to the cooler 11, and the cooler 11 is connected to the external device D101 through a pipeline;

[0027] The tower bottom discharge pipeline includes a fourth pipe section 12 from the outlet end of the tower bottom extraction pump 10 to the feed heat exchanger 9, a fifth pipe section 13 from the feed heat exchanger 9 to the cooler 11, and a sixth pipe section 14 from the cooler 11 to the external equipment;

[0028] The top discharge process of the separation tower 3 includes: a top extraction pump 15, an air cooler 16, a newly added discharge line 17, and a newly added heat exchanger 18; the top of the separation tower 3 is connected to the air cooler 16 through a pipeline, the air cooler 16 is connected to the top extraction pump 15 through a pipeline, the outlet end of the top extraction pump 15 leads to a newly added discharge line 17 and is connected to the newly added heat exchanger 18, the newly added heat exchanger 18 is connected to the plant tank area 19 through a pipeline after heat exchange, and the plant tank area 19 is connected to the loading line through a newly added pipeline 20;

[0029] In the above structure, the first pipeline 5, the second pipeline 6 and the third pipeline 7 are all DN250 pipelines; the fourth pipe section 12, the fifth pipe section 13 and the sixth pipe section 14 are all DN150 pipelines; and the newly added pipeline 20 is a DN350 pipeline.

[0030] By adopting the above process, the aromatization separation tower is used to cut the naphtha, and the heavy naphtha after cutting is returned to the pre-hydrogenation unit; the top oil is sent to the plant tank area 19 and sold as ethylene raw material.

[0031] The processing flow of the control system of the utility model is as follows: 200t / h naphtha is cut at a ratio of 50% through the aromatization C2F05 tower, 100t / h heavy oil goes to the pre-hydrogenation device, and 100t / h light oil goes to the internal floating roof atmospheric pressure tank for sale.

[0032] Processing capacity: 200t / h Light oil production: about 100t / h.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, 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.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

Claims

1. A control system for separating naphtha heavy components and light components, characterized in that: include: A naphtha feeding unit, a pre-hydrogenation device and an aromatization separation tower unit; an aromatization separation tower unit is arranged before the pre-hydrogenation device, and the naphtha feeding unit is connected to the pre-hydrogenation device through a pipeline; after the naphtha is cut by the aromatization separation tower unit, the heavy naphtha component is returned to the pre-hydrogenation device, and the light component is sent to the plant tank area and reaches the dock loading line.

2. A control system for separating heavy components and light components of naphtha according to claim 1, characterized in that: The naphtha feeding unit comprises a wharf naphtha tank area and a naphtha storage tank; the material from the wharf naphtha tank area reaches the naphtha storage tank through a pipeline, and the naphtha storage tank is connected to the pre-hydrogenation device through a pipeline.

3. A control system for separating heavy components and light components of naphtha according to claim 1, characterized in that: The aromatization separation tower unit comprises: a separation tower, a feed process arranged in the separation tower, a bottom discharge process of the separation tower and a top discharge process of the separation tower; the feed process of the separation tower is connected from the boundary position of the naphtha feeding unit, and is finally connected to the separation tower through the feed process of the separation tower through the feed pump at the front end of the separation tower.

4. A control system for separating heavy components and light components of naphtha according to claim 3, characterized in that: The feed process of the separation tower includes: a first pipeline, a second pipeline and a third pipeline, a feed filter, and a feed heat exchanger; a control valve is arranged on the first pipeline and connected to the feed filter, the outlet end of the feed filter is connected to the feed heat exchanger through the second pipeline, and the bottom of the feed heat exchanger is connected to the separation tower through the third pipeline.

5. A control system for separating heavy components and light components of naphtha according to claim 4, characterized in that: The first pipeline, the second pipeline and the third pipeline are all DN250 pipelines.

6. A control system for separating heavy components and light components of naphtha according to claim 3, characterized in that: The bottom discharge process of the separation tower includes: a bottom extraction pump, a feed heat exchanger, and a cooler; the bottom discharge pipeline is led out from the outlet end of the bottom extraction pump, connected to the feed heat exchanger and then connected to the cooler, and the cooler is connected to external equipment through a pipeline.

7. A control system for separating heavy components and light components of naphtha according to claim 6, characterized in that: The tower bottom discharge pipeline includes a fourth pipe section from the outlet end of the tower bottom extraction pump to the feed heat exchanger, a fifth pipe section from the feed heat exchanger to the cooler, and a sixth pipe section from the cooler to the external equipment.

8. A control system for separating heavy components and light components of naphtha according to claim 7, characterized in that: The fourth pipe section, the fifth pipe section and the sixth pipe section are all DN150 pipelines.

9. A control system for separating heavy components and light components of naphtha according to claim 3, characterized in that: The top discharge process of the separation tower includes: a top extraction pump, an air cooler, a newly added discharge line, and a newly added heat exchanger; the top of the separation tower is connected to the air cooler through a pipeline, the air cooler is connected to the top extraction pump through a pipeline, the outlet end of the top extraction pump leads to a newly added discharge line and is connected to the newly added heat exchanger, the newly added heat exchanger is connected to the plant tank area through a pipeline after heat exchange, and the plant tank area is connected to the loading line through a newly added pipeline.

10. A control system for separating heavy components and light components of naphtha according to claim 9, characterized in that: The newly added pipeline is a DN350 pipeline.

Images