C10 crude aromatic hydrocarbon tower production system

Abstract

The utility model relates to the technical field of chemical production, in particular to a C10 crude aromatic hydrocarbon tower production system, which is characterized in that an aromatic hydrocarbon incoming pipeline of a self-xylene separation unit is connected with a feed port, and a first valve is arranged on the aromatic hydrocarbon incoming pipeline of the self-xylene separation unit; a tube pass outlet of the feeding heat exchanger is connected with an aromatic hydrocarbon incoming pipeline from the xylene separation unit, a shell pass inlet of the feeding heat exchanger is connected with a 3.5 Mpa saturated steam pipeline, and a shell pass outlet of the feeding heat exchanger is connected with a 3.5 Mpa steam condensate pipeline; and an industrial C9 aromatic hydrocarbon feeding pipeline is connected with a tube pass inlet of the feeding heat exchanger. According to the utility model, the industrial C9 aromatic hydrocarbon feeding pipeline is heated by the feeding heat exchanger and then is introduced into the feeding hole of the industrial C10 crude aromatic hydrocarbon tower, and after the valve in front of the head point of the industrial C9 aromatic hydrocarbon feeding pipeline and the aromatic hydrocarbon incoming pipeline of the xylene separation unit is closed, the industrial C9 aromatic hydrocarbon can directly cross over the xylene unit; therefore, the energy consumption of xylene unit separation and the consumption of pump electric energy are saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of chemical production, specifically to a carbon ten crude aromatic hydrocarbon column production system. BACKGROUND

[0002] The carbon ten crude aromatic hydrocarbon column for industrial use of the aromatic hydrocarbon device is an ordinary rectifying column, the raw material is aromatic hydrocarbon reforming reaction generated oil, which is C9 aromatic hydrocarbon, C10 aromatic hydrocarbon and a small amount of C11 aromatic hydrocarbon after separation in a xylene unit, and a small amount of C8A aromatic hydrocarbon enters the carbon ten crude aromatic hydrocarbon column for industrial use. The operating parameters are: feed temperature 196 DEG C, feed pressure 0.08 Mpa, column top pressure 0.05 Mpa, column bottom pressure 0.11 Mpa, reflux tank pressure 0.02 Mpa, column bottom temperature 244 DEG C, reflux tank temperature 166 DEG C, and the design is bubble point two-phase flow feed. All C9 aromatic hydrocarbons and most C10 aromatic hydrocarbons are separated at the column top and used as raw materials for toluene disproportionation reaction, and the carbon ten crude aromatic hydrocarbon for industrial use (carbon ten crude aromatic hydrocarbon SH / T 1804-2016) is separated at the column bottom and sold as a product.

[0003] Because the processing raw materials of each refinery are complex, some refineries have no aromatic hydrocarbon device, and the carbon nine aromatic hydrocarbon components are often used for blending diesel oil, and the carbon nine aromatic hydrocarbon for industrial use SH / T 1825-2019 is also sold, which is used in the aromatic hydrocarbon disproportionation unit. In the prior art, the feed of the industrial carbon ten crude aromatic hydrocarbon column is the aromatic hydrocarbon reforming reaction generated oil, that is, C9 aromatic hydrocarbon, C10 aromatic hydrocarbon and a small amount of C11 aromatic hydrocarbon after separation in a xylene unit. This part of the feed will cause energy consumption and pump power consumption of the xylene unit separation. UTILITY MODEL CONTENT

[0004] In view of the defects of the prior art, the utility model provides a carbon ten crude aromatic hydrocarbon column production system, which introduces the feed inlet of the industrial carbon ten crude aromatic hydrocarbon column through the industrial carbon nine aromatic hydrocarbon feed pipeline after heating by a feed heat exchanger. When the valve before the intersection point of the industrial carbon nine aromatic hydrocarbon feed pipeline and the aromatic hydrocarbon feed pipeline from the xylene separation unit is closed, the xylene unit can be directly crossed, thereby saving the energy consumption and pump power consumption of the xylene unit separation.

[0005] In order to achieve the above object, the utility model provides a technical scheme for a C10 crude aromatic column production system, which comprises an industrial C10 crude aromatic column, a feed heat exchanger, and an industrial C9 aromatic feed pipeline; the industrial C10 crude aromatic column is provided with a top gas phase outlet, a feed inlet, a bottom outlet, and a reflux inlet; a self-xylene separation unit aromatic feed pipeline is connected to the feed inlet, and a first valve is arranged on the self-xylene separation unit aromatic feed pipeline; the tube side outlet of the feed heat exchanger is connected to the self-xylene separation unit aromatic feed pipeline, the shell side inlet is connected to a 3.5Mpa saturated steam pipeline, and the shell side outlet is connected to a 3.5Mpa steam condensate pipeline; the industrial C9 aromatic feed pipeline is connected to the tube side inlet of the feed heat exchanger.

[0006] Further, a first orifice plate flowmeter and a first flow control regulating valve group are arranged on the industrial C9 aromatic feed pipeline in sequence along the feed direction.

[0007] Further, the first orifice plate flowmeter and the first flow control regulating valve group are electrically connected.

[0008] Further, a second orifice plate flowmeter and a second valve are arranged on the 3.5Mpa saturated steam pipeline in sequence along the feed direction.

[0009] Further, a second flow control regulating valve group is arranged on the 3.5Mpa steam condensate pipeline.

[0010] Further, a second valve is arranged upstream of the second orifice plate flowmeter on the 3.5Mpa saturated steam pipeline; and a third valve is arranged downstream of the second flow control regulating valve group on the 3.5Mpa steam condensate pipeline.

[0011] Further, the second flow control regulating valve group is electrically connected to the second orifice plate flowmeter.

[0012] Further, the top gas phase outlet is connected to an air cooler, the air cooler is connected to an industrial C10 crude aromatic column reflux tank, and the industrial C10 crude aromatic column reflux tank is connected to the reflux inlet through a reflux pipeline.

[0013] Further, the industrial C10 crude aromatic column reflux tank is connected to a nitrogen supplement pipeline and a flare gas discharge pipeline, the nitrogen supplement pipeline is provided with a nitrogen supplement regulating valve group, and the flare gas discharge pipeline is provided with a flare gas discharge regulating valve group.

[0014] Further, the nitrogen supplement regulating valve group comprises a second regulating valve front gate valve, a nitrogen supplement pressure regulating valve, and a second regulating valve rear gate valve arranged in sequence along the feed direction, and a second bypass valve is arranged across the second regulating valve front gate valve and the second regulating valve rear gate valve.

[0015] The flare regulating valve group comprises a third regulating valve front gate valve, a flare pressure regulating valve and a third regulating valve rear gate valve arranged in sequence along a feeding direction, and a third bypass valve is arranged across the third regulating valve front gate valve and the third regulating valve rear gate valve.

[0016] The utility model discloses beneficial effect: the industrial carbon nine aromatic hydrocarbon feed pipeline is introduced into the feed inlet of the industrial carbon ten crude aromatic hydrocarbon column after heating through the feed heat exchanger, when the valve before the collision point of the industrial carbon nine aromatic hydrocarbon feed pipeline and the aromatic hydrocarbon incoming pipeline of the xylene separation unit is closed, then can directly cross the xylene unit, and further save the energy consumption and the consumption of pump electric energy of xylene unit separation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the process flow diagram of a carbon ten crude aromatic hydrocarbon column production system in an embodiment of the utility model;

[0018] Figure 2 It is the structure schematic diagram of the position of the second flow control regulating valve group in an embodiment of the utility model;

[0019] Figure 3 It is the process flow diagram of a carbon ten crude aromatic hydrocarbon column production system in another embodiment of the utility model;

[0020] Figure 4 It is the raw material component table of the feed of the aromatic hydrocarbon incoming pipeline of the xylene separation unit;

[0021] In the drawing:

[0022] 100, industrial carbon ten crude aromatic hydrocarbon column, 110, column top gas phase outlet, 111, air cooler, 112, industrial carbon ten crude aromatic hydrocarbon column reflux tank, 113, reflux pipeline, 114, toluene disproportionation reaction incoming pipeline connection, 120, feed inlet, 130, column bottom outlet, 131, industrial carbon ten crude aromatic hydrocarbon production pipeline, 140, reflux port,

[0023] 200, feed heat exchanger,

[0024] 400, aromatic hydrocarbon incoming pipeline of xylene separation unit, 410, first valve, 420, flow regulating valve group, 421, fifth regulating valve front gate valve, 422, fifth pressure regulating valve, 423, fifth regulating valve rear gate valve, 424, fifth bypass valve, 425, fifth guide valve,

[0025] 500, 3.5Mpa saturated steam pipeline connection, 510, second orifice plate flowmeter, 520, fourth valve, 530, second valve,

[0026] 600, 3.5Mpa steam condensate pipeline, 610, second flow control regulating valve group, 611, fourth regulating valve front gate valve, 612, fourth pressure regulating valve, 613, fourth regulating valve rear gate valve, 614, fourth bypass valve, 615, second pilot valve, 620, third valve,

[0027] 700, industrial carbon nine aromatic hydrocarbon feed pipeline, 710, first orifice plate flowmeter, 720, first flow control regulating valve group, 721, first regulating valve front gate valve, 722, first pressure regulating valve, 723, first regulating valve rear gate valve, 724, first bypass valve, 725, first pilot valve, 730, fifth valve,

[0028] 800, nitrogen supplement pipeline, 810, nitrogen supplement regulating valve group, 811, second regulating valve front gate valve, 812, nitrogen supplement pressure regulating valve, 813, second regulating valve rear gate valve, 814, second bypass valve,

[0029] 900, flare gas discharge pipeline, 910, flare gas discharge regulating valve group, 911, third regulating valve front gate valve, 912, flare gas discharge pressure regulating valve, 913, third regulating valve rear gate valve, 914, third bypass valve. DETAILED DESCRIPTION

[0030] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific details set forth herein without departing from the scope of the present application. It will be apparent to one of ordinary skill in the art that the present application can be practiced without some or all of these specific details. In other instances, well known structures have not been described in detail in order not to unnecessarily obscure the present application.

[0031] Referring to Figure 1The system for producing a C10 crude aromatic column comprises an industrial C10 crude aromatic column 100, a feed heat exchanger 200, and an industrial C9 aromatic feed pipeline 700; the industrial C10 crude aromatic column 100 is provided with a top gas phase outlet 110, a feed inlet 120, a bottom product outlet 130, and a reflux inlet 140; a xylene separation unit aromatic feed pipeline 400 is connected to the feed inlet 120, and a first valve 410 is arranged on the xylene separation unit aromatic feed pipeline 400; a tube side outlet of the feed heat exchanger 200 is connected to the xylene separation unit aromatic feed pipeline 400, a shell side inlet is connected to a 3.5 MPa saturated steam pipeline 500, and a shell side outlet is connected to a 3.5 MPa steam condensate pipeline 600; the industrial C9 aromatic feed pipeline 700 is connected to a tube side inlet of the feed heat exchanger 200. The top gas phase outlet 110 is connected to a toluene disproportionation reaction feed pipeline 114. The bottom product outlet 130 is connected to an industrial C10 crude aromatic product pipeline 131.

[0032] The system for producing a C10 crude aromatic column comprises an industrial C10 crude aromatic column 100, a feed heat exchanger 200, and an industrial C9 aromatic feed pipeline 700; the industrial C10 crude aromatic column 100 is provided with a top gas phase outlet 110, a feed inlet 120, a bottom product outlet 130, and a reflux inlet 140; a xylene separation unit aromatic feed pipeline 400 is connected to the feed inlet 120, and a first valve 410 is arranged on the xylene separation unit aromatic feed pipeline 400; a tube side outlet of the feed heat exchanger 200 is connected to the xylene separation unit aromatic feed pipeline 400, a shell side inlet is connected to a 3.5 MPa saturated steam pipeline 500, and a shell side outlet is connected to a 3.5 MPa steam condensate pipeline 600; the industrial C9 aromatic feed pipeline 700 is connected to a tube side inlet of the feed heat exchanger 200. The top gas phase outlet 110 is connected to a toluene disproportionation reaction feed pipeline 114. The bottom product outlet 130 is connected to an industrial C10 crude aromatic product pipeline 131.

[0033] As shown in the figure, after the modification, the industrial C9 aromatic is directly introduced into the industrial C10 crude aromatic column 100 for separation, the whole C9 aromatic and most of the C10 aromatic are separated from the top for use as raw materials for toluene disproportionation reaction, and the industrial C10 crude aromatic is separated from the bottom as a product for sale. Figure 1

[0034] ​In one embodiment, an orifice plate flow meter 710 and a first flow control regulating valve assembly 720 are sequentially installed along the feed direction on the industrial C9 aromatics feed line 700. The first orifice plate flow meter 710 is positioned upstream of the first flow control regulating valve assembly 720, measuring the flow rate at the front end and feeding feedback to the DCS control system, which then controls the valve position of the first flow control regulating valve assembly 720 through a single loop. Specifically, the first orifice plate flow meter 710 is a BB50-100 manufactured by Dalian Jinggong Automation Instrument Complete Set Technology Development Co., Ltd.

[0035] In one embodiment, the first orifice flow meter 710 is electrically connected to the first flow control regulating valve assembly 720. Specifically, the first flow control regulating valve assembly 720 includes a first regulating valve pre-gate valve 721, a first pressure regulating valve 722, and a first regulating valve post-gate valve 723, with a first bypass valve 724 positioned between the first regulating valve pre-gate valve 721 and the first regulating valve post-gate valve 723. The first pressure regulating valve 722 is electrically connected to the first orifice flow meter 710. A first drain valve 725 is positioned between the first regulating valve pre-gate valve 721 and the first pressure regulating valve 722. In this embodiment, the function of the first drain valve 725 is to allow for drainage of the pipeline when maintenance is required on the first flow control regulating valve assembly 720 or adjacent pipelines.

[0036] In one embodiment, a second orifice flow meter 510 and a second valve 520 are sequentially arranged along the feed direction on a 3.5 MPa saturated steam pipeline 500.

[0037] In one embodiment, a second flow control regulating valve assembly 610 is installed on the 3.5 MPa steam condensate pipeline 600. Specifically, the second flow control regulating valve assembly 610 includes a fourth regulating valve pre-gate valve 611, a fourth pressure regulating valve 612, and a fourth regulating valve post-gate valve 613, with a fourth bypass valve 614 installed between the fourth regulating valve pre-gate valve 611 and the fourth regulating valve post-gate valve 613. Further, a second drain valve 615 is installed between the fourth pressure regulating valve 612 and the fourth regulating valve post-gate valve 613.

[0038] In one embodiment, a second valve 530 is provided upstream of the second orifice plate flow meter 510 on the 3.5 MPa saturated steam pipeline 500; a third valve 620 is provided downstream of the second flow control regulating valve group 610 on the 3.5 MPa steam condensate pipeline 600.

[0039] In an embodiment, the second flow control regulating valve group 610 is electrically connected with the second orifice flow meter 510. The second orifice flow meter 510 is arranged upstream of the second flow control regulating valve group 610, and the valve position of the second flow control regulating valve group 610 is controlled by the DCS system single loop according to the measured flow at the front end. In a specific arrangement, the second orifice flow meter 510 is a BB50-80 produced by Dalian Jinggong Automatic Control Instrument Technology Development Company.

[0040] In an embodiment, the overhead vapor outlet 110 is connected to an air cooler 111, which is connected to an industrial carbon ten crude aromatic reflux tank 112, which is connected to the reflux port 140 through a reflux pipeline 113.

[0041] Continuing to refer to Figure 1 In an embodiment, the industrial carbon ten crude aromatic reflux tank 112 is connected with a nitrogen supplement pipeline 800 and a flare gas discharge pipeline 900. The nitrogen supplement pipeline 800 is provided with a nitrogen supplement regulating valve group 810, and the flare gas discharge pipeline 900 is provided with a flare gas discharge regulating valve group 910.

[0042] In a specific arrangement, in an embodiment, the nitrogen supplement regulating valve group 810 includes a second regulating valve front gate valve 811, a nitrogen supplement pressure regulating valve 812, and a second regulating valve rear gate valve 813 arranged in sequence along the feed direction, and a second bypass valve 814 is arranged across the second regulating valve front gate valve 811 and the second regulating valve rear gate valve 813. In this way, the second regulating valve front gate valve 811 and the second regulating valve rear gate valve 813 can isolate the nitrogen supplement pressure regulating valve 812. When the nitrogen supplement pressure regulating valve 812 needs to be replaced or repaired, the second bypass valve 814 is used to avoid the phenomenon of shutdown caused by the isolation of the nitrogen supplement pressure regulating valve 812, facilitating maintenance and having high flexibility.

[0043] The flare gas discharge regulating valve group 910 includes a third regulating valve front gate valve 911, a flare gas discharge pressure regulating valve 912, and a third regulating valve rear gate valve 913 arranged in sequence along the feed direction, and a third bypass valve 914 is arranged across the third regulating valve front gate valve 911 and the third regulating valve rear gate valve 913. In this way, the third regulating valve front gate valve 911 and the third regulating valve rear gate valve 913 can isolate the flare gas discharge pressure regulating valve 912. When the flare gas discharge pressure regulating valve 912 needs to be replaced or repaired, the third bypass valve 914 is used to avoid the phenomenon of shutdown caused by the isolation of the flare gas discharge pressure regulating valve 912, facilitating maintenance and having high flexibility.

[0044] Referring to Figure 3Further, in another embodiment, a flow regulating valve group 420 is provided on the paraffin feedstock pipeline 400 of the xylene separation unit, the flow regulating valve group 420 comprising a fifth regulating valve front gate valve 421, a fifth pressure regulating valve 422, a fifth regulating valve rear gate valve 423, and a fifth bypass valve 424 provided across the fifth regulating valve front gate valve 421 and the fifth regulating valve rear gate valve 423. A fifth control valve 425 is provided between the fifth regulating valve front gate valve 421 and the fifth pressure regulating valve 422.

[0045] Correspondingly, in the above embodiment, a fifth valve 730 is provided on the industrial carbon nine aromatic hydrocarbon feedstock pipeline 700 near the junction of the industrial carbon nine aromatic hydrocarbon feedstock pipeline 700 and the paraffin feedstock pipeline 400 of the xylene separation unit.

[0046] The above-mentioned carbon ten crude aromatic hydrocarbon column production system is provided with the fifth valve 730, when the feed heat exchanger 200 fails and needs to be repaired, the fifth valve 730 can be closed, the flow regulating valve group 420 is gradually opened, and the paraffin feedstock pipeline 400 of the xylene separation unit is reused for feeding, Figure 4 The material composition of the paraffin feedstock pipeline 400 of the xylene separation unit is shown in the table, which can be switched more flexibly, and the feed pipeline can be selectively switched according to the working condition.

[0047] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot 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" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can pass through intermediate medium indirectly connect, can be two element internal communication or two element mutual action relation, unless another definite limitation.For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific situation.

[0050] In the utility model, unless another definite provision and limitation, first feature is "on" or "under" second feature can be first and second features direct contact, or first and second features indirectly contact through intermediate medium.Moreover, first feature is "on", "above" and "on" second feature can be first feature is directly above or obliquely above second feature, or just indicate that the horizontal height of first feature is higher than second feature.First feature is "under", "below" and "under" second feature can be first feature is directly below or obliquely below second feature, or just indicate that the horizontal height of first feature is less than second feature.It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or an intervening element can be present. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used herein are used for illustrative purposes only and are not intended to be limiting.

Claims

1. A Cio crude aromatic column production system characterized by: comprising The industrial carbon ten crude aromatic column is provided with a top gas phase outlet, a feed inlet, a bottom outlet, and a reflux inlet; The self-xylene separation unit aromatic feed pipeline is connected with the feed inlet, and a first valve is arranged on the self-xylene separation unit aromatic feed pipeline; The feed heat exchanger is connected with the self-xylene separation unit aromatic feed pipeline at the tube side outlet, connected with the 3.5Mpa saturated steam pipeline at the shell side inlet, and connected with the 3.5Mpa steam condensate pipeline at the shell side outlet; The industrial carbon nine aromatic feed pipeline is connected with the tube side inlet of the feed heat exchanger.

2. A Cio crude aromatic column production system according to claim 1, characterized by: The first orifice flow meter and the first flow control adjusting valve group are arranged in the industrial carbon nine aromatic feed pipeline in sequence along the feed direction.

3. A Cio crude aromatic column production system according to claim 2, characterized by: The first orifice flow meter and the first flow control adjusting valve group are electrically connected.

4. A Cio crude aromatic column production system according to claim 1, characterized by: The second orifice flow meter and the second valve are arranged in the 3.5Mpa saturated steam pipeline in sequence along the feed direction.

5. A Cio crude aromatic column production system according to claim 4, characterized by: The second flow control adjusting valve group is arranged on the 3.5Mpa steam condensate pipeline.

6. A Cio crude aromatic column production system according to claim 5, characterized by: The second valve is arranged upstream of the second orifice flow meter on the 3.5Mpa saturated steam pipeline, and the third valve is arranged downstream of the second flow control adjusting valve group on the 3.5Mpa steam condensate pipeline.

7. A Cio crude aromatic column production system according to claim 5, characterized by: The second flow control adjusting valve group and the second orifice flow meter are electrically connected.

8. A Cio crude aromatic column production system according to any one of claims 1-7, characterized by: The top gas phase outlet is connected to an air cooler, the air cooler is connected with an industrial carbon ten crude aromatic column reflux tank, and the industrial carbon ten crude aromatic column reflux tank is connected to the reflux inlet through a reflux pipeline.

9. A Cio crude aromatic column production system according to claim 8, characterized by: The industrial carbon ten crude aromatic column reflux tank is connected with a nitrogen supplement pipeline and a flare gas discharge pipeline, the nitrogen supplement pipeline is provided with a nitrogen supplement adjusting valve group, and the flare gas discharge pipeline is provided with a flare gas discharge adjusting valve group.

10. A Cio crude aromatic column production system according to claim 9, characterized in that: The nitrogen supplement adjusting valve group comprises a second adjusting valve front gate valve, a nitrogen supplement pressure adjusting valve, and a second adjusting valve rear gate valve arranged in sequence along the feed direction, and a second bypass valve is arranged across the second adjusting valve front gate valve and the second adjusting valve rear gate valve; The flare gas discharge adjusting valve group comprises a third adjusting valve front gate valve, a flare gas discharge pressure adjusting valve, and a third adjusting valve rear gate valve arranged in sequence along the feed direction, and a third bypass valve is arranged across the third adjusting valve front gate valve and the third adjusting valve rear gate valve.

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