A system for controlling the end point of gasoline blending components

Abstract

The utility model relates to a system of controlling gasoline blending component end boiling point superhigh relates to the technical field of reducing gasoline blending component end boiling point, including xylene tower, the middle part of xylene tower is provided with the oil inlet pipeline that C8 + fraction oil enters, the top of xylene tower is provided with the first oil outlet that xylene fraction flows out, the bottom of xylene tower is provided with the second oil outlet that heavy component flows out, the lower part of xylene tower is provided with the third oil outlet that gasoline blending component flows out, the third oil outlet is connected with the aromatic buffer tank that sets up outside xylene tower, and the third oil outlet and aromatic buffer tank between along gasoline blending component flowing direction are sequentially provided with gasoline steam generator, first heat exchanger, aromatic heat exchanger, air cooler and aromatic after cooler, the bottom of xylene tower is provided with second heat exchanger and heavy component after cooler, the utility model discloses, and gasoline blending component is removed heavy component in xylene tower, and the dry point of gasoline meets the standard.

Description

Technical Field

[0001] This utility model relates to the technical field of reducing the final boiling point of gasoline blending components, specifically a system for controlling excessively high final boiling points of gasoline blending components. Background Technology

[0002] Currently, catalytic reformed gasoline is virtually olefin-free, with extremely low sulfur and nitrogen content, low vapor pressure, and high octane rating, making it a high-quality, clean gasoline component. Specifically, reformed gasoline, after removing C6, C7, and C8 components, contains C8... + Distillate oil enters a xylene tower, where it is separated into xylene fraction and gasoline blending component. The xylene fraction flows out from the top of the xylene tower, while the gasoline blending component flows out from the bottom. However, due to upstream feedstock adjustments, the final boiling point at the bottom of the xylene tower is higher, causing a change in the gasoline blending component. Specifically, the gasoline blending component contains excessive heavy components, resulting in gasoline with an excessively high dry point. Utility Model Content

[0003] To address the problem of high final boiling points in existing gasoline blending components, this invention provides a system for controlling excessively high final boiling points of gasoline blending components. The gasoline blending components are decomposed into heavy components within a xylene tower, ensuring that the gasoline's dry point meets the standard.

[0004] To achieve the above objectives, the specific solution adopted by this utility model is as follows: a system for controlling excessively high final boiling points of gasoline blending components, comprising a xylene tower, wherein a C8 supply is provided in the middle of the xylene tower. + The inlet pipeline for distillate oil has a first outlet at the top of the xylene tower for xylene fraction to flow out, a second outlet at the bottom for heavy components to flow out, and a third outlet at the bottom for gasoline blending components to flow out. The third outlet is connected to an aromatics buffer tank located outside the xylene tower. Between the third outlet and the aromatics buffer tank, along the flow direction of the gasoline blending components, a gasoline vapor generator, a first heat exchanger, an aromatics heat exchanger, an air cooler, and an aromatics aftercooler are arranged in sequence. This allows the gasoline blending components in the xylene tower to flow sequentially through the gasoline vapor generator, the first heat exchanger, the aromatics heat exchanger, the air cooler, and the aromatics aftercooler before finally flowing into the aromatics buffer tank. The bottom of the xylene tower has a second heat exchanger and a heavy components aftercooler. The heavy components flow out of the xylene tower from the second outlet and then sequentially through the second heat exchanger and the heavy components aftercooler before flowing out.

[0005] As an optimized solution for the above-mentioned system for controlling the excessively high final boiling point of gasoline blending components: a xylene reflux tank is provided outside the xylene, the inlet of the xylene reflux tank is connected to the first oil outlet, and the outlet of the xylene reflux tank is connected to the xylene tower through the first reflux pipeline.

[0006] As another optimized solution for the above-mentioned system for controlling the excessively high final boiling point of gasoline blending components: the first oil outlet is connected to the first oil outlet pipeline, and the inlet of the xylene reflux tank is connected to the first oil outlet pipeline through the first branch pipeline.

[0007] As another optimization scheme for the above-mentioned system for controlling the excessively high final boiling point of gasoline blending components: a fractionation tower reboiler is provided outside the xylene tower. The inlet of the fractionation tower reboiler is connected to the first oil outlet pipeline through a second branch pipeline, and the outlet of the fractionation tower reboiler is connected to the xylene reflux tank.

[0008] As another optimization scheme for the above-mentioned system for controlling the excessively high final boiling point of gasoline blending components: a toluene tower reboiler is installed outside the xylene tower. The inlet of the toluene tower reboiler is connected to the first oil outlet pipeline through a third branch pipeline, and the outlet of the toluene tower reboiler is connected to the xylene reflux tank.

[0009] As another optimization scheme for the above-mentioned system for controlling the excessively high final boiling point of gasoline blending components: the second oil outlet is connected to the inlet of the second heat exchanger through the second oil outlet pipeline, a heating furnace is connected to the upper side of the second oil outlet pipeline, and the inlet of the heating furnace is connected to the second oil outlet pipeline. The outlet of the heating furnace is connected to the xylene tower through the second reflux pipeline.

[0010] As another optimization scheme for the above-mentioned system for controlling the excessively high final boiling point of gasoline blending components: a pump for extracting heavy components is installed on the second oil outlet line.

[0011] As another optimization scheme for the above-mentioned system for controlling the excessively high final boiling point of gasoline blending components: the third oil outlet is provided with a third oil outlet pipeline, and the end of the third oil outlet pipeline away from the xylene tower is connected to the inlet of the gasoline vapor generator.

[0012] As another optimization scheme for the above-mentioned system for controlling the excessively high final boiling point of gasoline blending components: the outlet of the aromatics buffer tank is connected to a gasoline blending device via an external pipeline.

[0013] As another optimization scheme for the above-mentioned system for controlling the excessively high final boiling point of gasoline blending components: an aromatic hydrocarbon delivery pump is installed on the delivery pipeline.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a system for controlling the excessively high final boiling point of gasoline blending components. A third oil outlet is provided at the bottom of the xylene tower to discharge C9 from the xylene tower. +Aromatics are extracted, and heavy components are removed, ensuring that the gasoline dry point meets the standard. At the same time, the heavy components flow out from the bottom of the xylene tower and then flow out after passing through the second heat exchanger and the heavy component aftercooler, making full use of the heat source and achieving thermal integration, thus reducing the system's energy consumption. This system also has the advantages of low investment cost and high yield of gasoline blending components. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention.

[0016] Figure reference numerals: 1. Xylene tower; 101. Inlet pipeline; 102. First outlet pipeline; 103. Second outlet pipeline; 2. Gasoline vapor generator; 4. First heat exchanger; 5. Aromatic heat exchanger; 6. Air cooler; 7. Aromatic aftercooler; 8. Aromatic buffer tank; 801. Aromatic external pump; 9. Xylene reflux tank; 901. First branch pipeline; 902. First reflux pipeline; 10. Fractionation tower reboiler; 1001. Second branch pipeline; 11. Toluene tower reboiler; 1101. Third branch pipeline; 12. Second heat exchanger; 13. Heavy component aftercooler; 14. Heating furnace. Detailed Implementation

[0017] The technical solution of this utility model will be further described in detail below with reference to specific embodiments. Parts not described or disclosed in detail in the following embodiments of this utility model should be understood as prior art known or should be known by those skilled in the art.

[0018] Example A system for controlling excessively high final boiling points of gasoline blending components, such as Figure 1 As shown, it includes a xylene tower 1, and a C8 supply is provided in the middle of the xylene tower 1. + Distillate oil enters through inlet line 101, C8 + The distillate oil enters the xylene tower 1 through the inlet pipeline 101 for separation into xylene fraction, gasoline blending components, and heavy components, of which C8... + The distillate oils come from the bottom of the reformate distillation column and the bottom of the toluene column. The xylene fraction is located at the top of xylene column 1, the gasoline blending components are located at the bottom of xylene column 1, and the heavy components are located at the bottom of xylene column 1.

[0019] The top of the xylene tower 1 is provided with a first oil outlet for xylene fraction to flow out, and the first oil outlet is connected to a first oil outlet pipeline 102. The xylene tower is provided with a xylene reflux tank 9, a fractionation tower reboiler 10 and a toluene tower reboiler 11. Specifically, the inlet of the xylene reflux tank 9 is connected to the first oil outlet. In this embodiment, the inlet of the xylene reflux tank 9 is connected to the first oil outlet pipeline 102 through a first branch pipeline 901, and the outlet of the xylene reflux tank 9 is connected to the xylene tower 1 through the first reflux pipeline 902. A pump is provided on the first reflux pipeline 902. The inlet of the fractionation tower reboiler 10 is connected to the first oil outlet line 102 via the second branch line 1001, and the outlet of the fractionation tower reboiler 10 is connected to the xylene reflux tank 9. The inlet of the toluene tower reboiler 11 is connected to the first oil outlet line 102 via the third branch line 1101, and the outlet of the toluene tower reboiler 11 is connected to the xylene reflux tank 9. In this embodiment, the xylene fraction flows out of the xylene tower 1 and is divided into three parts. One part enters the xylene reflux tank 9 via the first branch line 901; one part flows into the fractionation tower reboiler 10 via the second branch line 1001 and finally flows into the xylene reflux tank 9; the remaining part flows into the toluene tower reboiler 11 via the third branch line 1101 and finally flows into the xylene reflux tank 9. The xylene fraction in the xylene reflux tank 9 re-enters the xylene tower 1 via the first reflux line 902.

[0020] The bottom of the xylene tower 1 is provided with a second oil outlet for the heavy component to flow out. A second heat exchanger 12 and a heavy component aftercooler 13 are also provided at the bottom of the xylene tower 1. The heavy component flows out of the xylene tower 1 from the second oil outlet and flows sequentially through the second heat exchanger 12 and the heavy component aftercooler 13 before exiting. Specifically, the second oil outlet is connected to the inlet of the second heat exchanger 12 via a second oil outlet pipeline 103. A pump for extracting the heavy component is installed on the second oil outlet pipeline 103. The outlet of the second heat exchanger 12 is connected to the inlet of the heavy component aftercooler 13. A heater 14 is connected to the upper side of the second oil outlet pipeline 103, and the inlet of the heater 14 is connected to the second oil outlet pipeline 103. The outlet of the heater 14 is connected to the xylene tower via a second reflux pipeline. In this embodiment, the heavy component flows out from the second oil outlet into the second oil outlet pipeline 103 and is divided into two parts. One part flows out of the system after passing through the second heat exchanger 12 and the heavy component aftercooler 13 in sequence from the second oil outlet pipeline 103; the other part flows into the heating furnace 14 from the second oil outlet pipeline 103 and is used as fuel oil, and finally flows back into the xylene tower 1.

[0021] The lower part of the xylene tower 1 is provided with a third oil outlet for the gasoline blending components to flow out. The third oil outlet is connected to an aromatics buffer tank 8 located outside the xylene tower 1. Between the third oil outlet and the aromatics buffer tank 8, along the flow direction of the gasoline blending components, a gasoline vapor generator 2, a first heat exchanger 4, an aromatics heat exchanger 5, an air cooler 6, and an aromatics aftercooler 7 are arranged in sequence. This allows the gasoline blending components in the xylene tower 1 to flow sequentially through the gasoline vapor generator 2, the first heat exchanger 4, the aromatics heat exchanger 5, the air cooler 6, and the aromatics aftercooler 7, and finally flow into the aromatics buffer tank 8. Specifically, a third oil outlet is provided with a third oil outlet pipeline, one end of which is connected to the third oil outlet of xylene tower 1, and the end of the third oil outlet pipeline away from xylene tower 1 is connected to the inlet of gasoline vapor generator 2. The inlet of the first heat exchanger 4 is connected to the outlet of gasoline vapor generator 2. The outlet of the first heat exchanger 4 is connected to the inlet of aromatic heat exchanger 5. The outlet of aromatic heat exchanger 5 is connected to the inlet of air cooler 6. The inlet of aromatic aftercooler 7 is connected to the outlet of air cooler 6. The outlet of aromatic aftercooler 7 is connected to the inlet of aromatic buffer tank 8. The outlet of aromatic buffer tank 8 is connected to a gasoline blending device through an external delivery pipeline, and an aromatic external delivery pump 801 is provided on the external delivery pipeline. The gasoline blending components at the bottom of the xylene tower 1 flow sequentially through the gasoline vapor generator 2, the first heat exchanger 4, the aromatics heat exchanger 5, the air cooler 6, and the aromatics aftercooler 7, and finally flow into the aromatics buffer tank 8. Then, the gasoline blending components in the aromatics buffer tank 8 are pumped into the gasoline blending device by the aromatics external pump 801.

[0022] The above system's third oil outlet will allow C9 in xylene tower 1 to be discharged. + Aromatics are extracted to remove heavy components, ensuring the gasoline's dry point meets the standard. Simultaneously, the heavy components flow out from the bottom of xylene tower 1, and after passing through the second heat exchanger 12 and the heavy component aftercooler 13, making full use of the heat source and achieving thermal integration, thus reducing the system's energy consumption. This system also has the advantages of low investment cost and high yield of gasoline blending components.

[0023] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system for controlling excessively high final boiling points of gasoline blending components, comprising a xylene tower (1), wherein the middle section of the xylene tower (1) is provided with a C8 supply... + The inlet pipeline (101) into which the distillate oil enters, the top of the xylene tower (1) is provided with a first outlet for the xylene fraction to flow out, and the bottom of the xylene tower (1) is provided with a second outlet for the heavy fraction to flow out, characterized in that: The lower part of the xylene tower (1) is provided with a third oil outlet for the gasoline blending components to flow out. The third oil outlet is connected to an aromatics buffer tank (8) located outside the xylene tower (1). A gasoline vapor generator (2), a first heat exchanger (4), an aromatics heat exchanger (5), an air cooler (6), and an aromatics aftercooler (7) are arranged sequentially between the third oil outlet and the aromatics buffer tank (8) along the flow direction of the gasoline blending components. This allows the gasoline blending components in the xylene tower (1) to flow sequentially through the gasoline vapor generator (2), the first heat exchanger (4), the aromatics heat exchanger (5), the air cooler (6), and the aromatics aftercooler (7), and finally flow into the aromatics buffer tank (8). The bottom of the xylene tower (1) is provided with a second heat exchanger (12) and a heavy component aftercooler (13). The heavy components flow out of the xylene tower (1) from the second oil outlet and flow sequentially through the second heat exchanger (12) and the heavy component aftercooler (13) before flowing out.

2. The system for controlling excessively high final boiling points of gasoline blending components as described in claim 1, characterized in that: The xylene is provided with a xylene reflux tank (9) outside. The inlet of the xylene reflux tank (9) is connected to the first oil outlet, and the outlet of the xylene reflux tank (9) is connected to the xylene tower (1) through the first reflux pipeline (902).

3. The system for controlling excessively high final boiling points of gasoline blending components as described in claim 2, characterized in that: The first oil outlet is connected to the first oil outlet pipeline (102), and the inlet of the xylene reflux tank (9) is connected to the first oil outlet pipeline (102) through the first branch pipeline (901).

4. The system for controlling excessively high final boiling points of gasoline blending components as described in claim 3, characterized in that: The xylene tower (1) is equipped with a fractionation tower reboiler (10) outside. The inlet of the fractionation tower reboiler (10) is connected to the first oil outlet pipeline (102) through the second branch pipeline (1001), and the outlet of the fractionation tower reboiler (10) is connected to the xylene reflux tank (9).

5. The system for controlling excessively high final boiling points of gasoline blending components as described in claim 3, characterized in that: The xylene tower (1) is equipped with a toluene tower reboiler (11). The inlet of the toluene tower reboiler (11) is connected to the first oil outlet pipeline (102) through the third branch pipeline (1101), and the outlet of the toluene tower reboiler (11) is connected to the xylene reflux tank (9).

6. The system for controlling excessively high final boiling points of gasoline blending components as described in claim 1, characterized in that: The second oil outlet is connected to the inlet of the second heat exchanger (12) through the second oil outlet pipeline (103). A heating furnace (14) is connected to the upper side of the second oil outlet pipeline (103), and the inlet of the heating furnace (14) is connected to the second oil outlet pipeline (103). The outlet of the heating furnace (14) is connected to the xylene tower (1) through the second reflux pipeline.

7. The system for controlling excessively high final boiling points of gasoline blending components as described in claim 6, characterized in that: The second oil outlet pipeline (103) is equipped with an extraction pump for extracting heavy components.

8. The system for controlling excessively high final boiling points of gasoline blending components as described in claim 1, characterized in that: The third oil outlet is equipped with a third oil outlet pipeline, and the end of the third oil outlet pipeline away from the xylene tower (1) is connected to the inlet of the gasoline vapor generator (2).

9. The system for controlling excessively high final boiling points of gasoline blending components as described in claim 1, characterized in that: The outlet of the aromatics buffer tank (8) is connected to a gasoline blending device via an external pipeline.

10. The system for controlling excessively high final boiling points of gasoline blending components as described in claim 9, characterized in that: An aromatic hydrocarbon delivery pump (801) is installed on the delivery pipeline.

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