An aromatization production device for improving the quality of aromatic hydrocarbons

Abstract

The utility model discloses a kind of aromatization production devices for improving aromatic quality, the production device is connected by external diesel pipeline, and is interlocked with diesel flow controller by heavy tower bottom temperature transmitter, realizes according to operating condition change control diesel pipe feed quantity, solves the problem of unqualified quality of heavy aromatic hydrocarbon caused by aromatization due to aromatic raw material change.

Description

Technical Field

[0001] This utility model relates to the field of heavy aromatic hydrocarbon extraction technology, specifically to an aromatization production device for improving the quality of aromatic hydrocarbons. Background Technology

[0002] Heavy aromatics are important raw materials in the petrochemical industry. Heavy aromatics refer to mixed aromatics with a molecular weight greater than xylene. They mainly originate from reformed heavy aromatics, cracked gasoline heavy aromatics, and coal tar. They are a type of mixed aromatics with C9 aromatics as the main component, exhibiting good stability and containing almost no olefins, thus possessing high processing potential.

[0003] Reforming heavy aromatics is an important industrial source of heavy aromatics. However, during the operation of reforming units, the fluctuating properties of the feedstock in aromatization units significantly affect the aromatization process and product quality. The feedstock components entering the unit become lighter, with lower levels of heavy components. However, to supply heat to the stripping and de-heavy-hydrogenation towers, the bottom temperature of the de-heavy-hydrogenation tower must be raised to approximately 344°C, very close to the design value. But after this temperature increase, virtually no heavy aromatics are produced at the bottom of the de-heavy-hydrogenation tower; only a small amount circulates at the bottom, and the quality of these heavy aromatics is substandard.

[0004] Therefore, it is necessary to design an aromatization production unit to improve the quality of aromatics and overcome the defect of unqualified heavy aromatics caused by changes in aromatic feedstock. Utility Model Content

[0005] The purpose of this invention is to provide an aromatization production apparatus that improves the quality of aromatics and overcomes the defect of unqualified heavy aromatics due to changes in aromatic feedstock.

[0006] To achieve the above objectives, the solution of this utility model is as follows:

[0007] An aromatization production apparatus for improving the quality of aromatics includes a deweighting tower, with an aromatics pipe and a diesel pipe at the feed end of the deweighting tower; the diesel pipe is equipped with an interlocked valve and a flow controller; and the bottom of the deweighting tower is equipped with a temperature transmitter interlocked with the flow controller.

[0008] As a preferred embodiment of the present invention, the aromatization production apparatus further includes a diesel tank, and the diesel pipeline is connected to the lower part of the diesel tank via a pump.

[0009] As a preferred embodiment of this utility model, the diesel pipeline is provided with a secondary line, which is located at both ends of valve one, and valve three is provided on the secondary line.

[0010] As a preferred embodiment of this utility model, the aromatic hydrocarbon pipe is provided with a second valve, and the diesel fuel pipe is connected to the front end of the second valve.

[0011] As a more preferred embodiment of the present invention, the second valve is provided with a secondary line, which is disposed at both ends of the second valve, and the fourth valve is disposed on the secondary line.

[0012] As a preferred embodiment of this utility model, the bottom of the heavy aromatics removal tower is provided with a heavy aromatics pipe, and a second pump is connected to the heavy aromatics pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] The production device described in this utility model connects to an external diesel pipeline and is interlocked with a diesel flow controller via a temperature transmitter at the bottom of the de-heavy tower. This allows for control of the diesel feed rate based on changes in operating conditions, thus solving the problem of substandard quality of aromatic heavy aromatics caused by changes in aromatic raw materials. Attached Figure Description

[0015] Figure 1 This utility model provides an overall schematic diagram of an aromatization production apparatus for improving the quality of aromatics.

[0016] The attached figures are labeled as follows:

[0017] FT1, Flow controller; K1, Valve 1; K2, Valve 2; K3, Valve 3; K4, Valve 4; L1, Aromatics pipe; L2, Diesel pipe; L3, Heavy aromatics pipe; P1, Pump 1; P2, Pump 2; T1, De-weighting tower; TT1, Temperature transmitter; V1, Diesel tank. Detailed Implementation

[0018] 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.

[0019] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0021] In one embodiment, such as Figure 1 As shown, an aromatization production device for improving the quality of aromatics is proposed, including a deweighting tower T1, with an aromatics pipe L1 and a diesel pipe L2 at the feed end of the deweighting tower T1; a valve K1 and a flow controller FT1 are installed on the diesel pipe L2; and a temperature transmitter TT1, which is interlocked with the flow controller FT1, is installed at the bottom of the deweighting tower T1.

[0022] In the above embodiment, since the quality of aromatics transported by aromatics pipe L1 is unstable, it will cause the temperature at the bottom of the de-heavy tower T1 to drop and the quality of heavy aromatics to be unqualified. By connecting an external diesel pipe L2, the bottom temperature transmitter TT1 of the de-heavy tower T1 is interlocked with the diesel flow controller FT1 to realize the control of the feed rate of diesel pipe L2 according to the changes in operating conditions. By introducing diesel containing a certain content of heavy aromatics, the problem of unqualified quality of aromatized heavy aromatics caused by changes in aromatic raw materials is solved.

[0023] In a preferred embodiment, the aromatization production apparatus further includes a diesel tank L2, and the diesel pipeline L2 is connected to the lower part of the diesel tank L2 via a pump P1. The external diesel tank L2, connected to a power pump, stabilizes the diesel feed source and improves the stability of feed control.

[0024] It is understandable that the diesel fuel used in diesel tank L2 can be either light diesel fuel or heavy diesel fuel. The amount of diesel fuel entering the de-weighting tower T1 can be controlled according to its content, thereby achieving normal operation under the preset de-weighting conditions.

[0025] In a preferred embodiment, the diesel fuel pipe L2 has a secondary line located at both ends of valve one K1, and valve three K3 is installed on the secondary line. Valve two K2 is installed on the aromatic hydrocarbon pipe L1, and the diesel fuel pipe L2 connects to the front end of valve two K2. Valve two K2 also has a secondary line located at both ends of valve two K2, and valve four K4 is installed on the secondary line. Valve three K3 works in conjunction with valve one K1, and valve four K4 works in conjunction with valve two K2. Furthermore, by each having a front and rear valve, a regulating valve assembly can be formed, improving control stability.

[0026] In a preferred embodiment, the bottom of the heavy aromatics removal tower T1 is equipped with a heavy aromatics pipe L3, which is connected to a pump P2. The heavy aromatics produced at the bottom of the heavy aromatics removal tower T1 are collected through the heavy aromatics pipe L3. The heavy aromatics removal tower T1 can be a commonly used heavy aromatics removal tower, consisting of a series of trays or packing, which utilizes the difference in volatility of substances to remove heavy components from the mixture.

[0027] It is understood that the terms "front end" and "rear end" are relative to the direction of material flow in and out. For example, the front end of a valve is the inlet, and the rear end is the outlet. This is a common way of describing things in this field.

[0028] It is understood that the pipeline material used in the aromatization production device can be selected according to the requirements of heat resistance and corrosion resistance, and the type of instruments or valves used can be selected according to the requirements of automation. All of these are within the design scope of this solution and will not be elaborated here.

[0029] 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. An aromatization production apparatus for improving the quality of aromatics, characterized in that, It includes a de-weighting tower (T1), with an aromatics pipe (L1) and a diesel pipe (L2) at the feed end of the de-weighting tower (T1); the diesel pipe (L2) is equipped with an interlocked valve (K1) and a flow controller (FT1); the bottom of the de-weighting tower (T1) is equipped with a temperature transmitter (TT1) interlocked with the flow controller (FT1).

2. The aromatization production apparatus according to claim 1, characterized in that, The aromatization production unit also includes a diesel tank (L2), and the diesel pipe (L2) is connected to the lower part of the diesel tank (L2) via a pump (P1).

3. The aromatization production apparatus according to claim 1, characterized in that, The diesel pipeline (L2) is equipped with a branch line, which is located at both ends of valve one (K1), and valve three (K3) is installed on the branch line.

4. The aromatization production apparatus according to claim 1, characterized in that, The aromatics pipe (L1) is equipped with valve two (K2), and the diesel pipe (L2) is connected to the front end of valve two (K2).

5. The aromatization production apparatus according to claim 4, characterized in that, The valve two (K2) is provided with a secondary line, which is located at both ends of the valve two (K2), and the secondary line is provided with valve four (K4).

6. The aromatization production apparatus according to claim 1, characterized in that, The bottom of the heavy aromatics removal tower (T1) is equipped with a heavy aromatics pipe (L3), and a second pump (P2) is connected to the heavy aromatics pipe (L3).

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