CN217230591U

CN217230591U - Extraction and transformation system of benzene hydrogenation pre-distillation tower

Info

Publication number: CN217230591U
Application number: CN202221048339.5U
Authority: CN
Inventors: 王显; 贾德策; 李梦年; 郭青龙; 闫军
Original assignee: Linhuan Coking and Chemical Co Ltd
Current assignee: Linhuan Coking and Chemical Co Ltd
Priority date: 2022-05-05
Filing date: 2022-05-05
Publication date: 2022-08-19
Anticipated expiration: 2032-05-05

Abstract

The utility model provides a benzene hydrogenation is tower extraction transformation system in advance, relates to benzene hydrogenation technical field, including tower in advance, reboiler and heavy benzol extraction pump, the tower bottom of tower in advance is connected with the three-way pipe, and the below output of three-way pipe is connected with first pipeline, the other end of first pipeline is connected with one side circulation mouth of tower in advance, the reboiler intercommunication is on first pipeline, one side output of three-way pipe is connected with the second pipeline; the input end of the heavy benzene extraction pump is connected with the output end of the second pipeline; the utility model discloses with the bottom of the access connection of first pipeline rectification tower in advance, exit linkage rectification tower circulation mouth in advance sets up the reboiler and circulates the processing to the material on first pipeline, owing to exit lug connection, so the bottom of the tower circulation can utilize the siphon principle, regards as the heating source with middling pressure steam, and heavy benzol extraction pump does not participate in the circulation, only at circulation processing back discharge heavy benzol, is difficult for taking gas in the pump, and the operation is stable, starts convenient and reliable.

Description

Extraction and transformation system of benzene hydrogenation pre-distillation tower

Technical Field

The utility model relates to a benzene hydrogenation technical field especially relates to a benzene hydrogenation is tower extraction in advance reforms distillation and is reformed transform system.

Background

In the benzene hydrogenation device, a pre-distillation tower is used for pre-treating and removing heavy benzene, the heavy benzene is extracted from the bottom of the pre-distillation tower as a product, and in order to prevent the tower bottom from being operated under the condition of over-high temperature and under the negative pressure, as shown in figure 1, a tower bottom pump (P-102) uses an 18.5KW magnetic pump, the pipeline communicated with a reboiler is communicated through the tower bottom pump, the pipeline communicated with a heavy benzene cooler is firstly closed, the pipeline communicated with the reboiler is circularly treated by utilizing the power provided by the tower bottom pump, then the material enters the pre-distillation tower, after treatment, the pipeline communicated with the reboiler is closed, the pipeline communicated with the heavy benzene cooler is opened, and the heavy benzene at the bottom of the pre-distillation tower is discharged.

However, the tower bottom pump is expensive, require highly to the import material, the operation easily takes gas to fall to press under the negative pressure circulation condition, tower bottom pump operation is unstable in actual operation, because the tower of rectifying in advance is the negative pressure tower, former tower bottom pump often can fall to press when the operation, need often clear up the import filter of tower bottom pump, taste is big when clearing import filter, the heavy benzol that gives off glues on the clothing and stays the time length extremely unfavorable to field operation and maintainer healthy, also influence operational environment, and the normal operating of tower and the stable extraction of heavy benzol are in advance influenced, therefore, the utility model provides a benzene hydrogenation is extracted in advance the rectifying column and is reformed transform the system in order to solve the problem that exists among the prior art.

Disclosure of Invention

To the problem, the utility model provides a benzene hydrogenation is rectification tower in advance and is adopted transformation system, this benzene hydrogenation is rectification tower in advance and is adopted difficult area gas in the transformation system pump, and the operation is stable, starts convenient and reliable.

For realizing the purpose of the utility model, the utility model discloses a following technical scheme realizes: a benzene hydrogenation prefractionator extraction transformation system comprises a prefractionator, a reboiler and a heavy benzene extraction pump, wherein the tower bottom of the prefractionator is connected with a three-way pipe, the output end of the lower part of the three-way pipe is connected with a first pipeline, the other end of the first pipeline is connected with a side circulation port of the prefractionator, the reboiler is communicated with the first pipeline, and the output end of one side of the three-way pipe is connected with a second pipeline;

the input end of the heavy benzene extraction pump is connected with the output end of the second pipeline, a third pipeline is arranged at the output end of the heavy benzene extraction pump, and the output end of the third pipeline is connected with a heavy benzene cooler.

The further improvement is that: and a feeding pipeline is arranged above one side of the prefractionation tower, a gas phase outlet is arranged above the prefractionation tower, and the output end of the heavy benzene cooler is connected with a heavy benzene extraction pipeline.

The further improvement is that: the heavy benzene recovery device comprises a feeding pipeline, a reboiler, a gas phase outlet and a heavy benzene extraction pipeline, wherein the feeding pipeline is used for inputting materials to be processed into the pre-distillation tower, the reboiler is used for separating the materials into a gas phase and a liquid phase and enabling the gas phase and the liquid phase to circulate into the pre-distillation tower through a first pipeline, the gas phase outlet is used for discharging a gas phase, and the heavy benzene extraction pipeline is used for discharging liquid phase heavy benzene to a storage tank.

The further improvement is that: the heavy benzene extraction pipeline is provided with a regulating valve and a second valve.

The further improvement lies in that: the input end of the first pipeline is provided with a third valve, the input end of the reboiler is provided with a fourth valve on the first pipeline, and the output end of the reboiler is provided with a fifth valve on the first pipeline.

The further improvement lies in that: and the second pipeline is connected with a sixth valve, and the third pipeline is connected with a seventh valve.

The further improvement lies in that: and the upper part and the lower part of one side of the reboiler are respectively provided with a heat source inlet and a heat source outlet, and the heat source inlet is used for introducing medium-pressure steam into the reboiler as a heating source.

The utility model has the advantages that:

1. the utility model discloses with the bottom of the access connection of first pipeline distillation column in advance, exit linkage distillation column circulation mouth in advance sets up the reboiler and circulates the processing to the material on first pipeline, owing to import and export lug connection, so the siphon principle can be utilized in the circulation at the bottom of the tower, regards as the heating source with middling pressure steam, and the heavy benzol extraction pump does not participate in the circulation, only in circulation processing back discharge heavy benzol, is difficult for taking gas in the pump, and the operation is stable, starts convenient and reliable.

2. The utility model discloses need not the tower bottom pump, increase the heavy benzol and extract the pump can, the heavy benzol is extracted the pump and is airtight canned motor pump, and is safe high-efficient, has practiced thrift energy resource consumption, promotes economic benefits.

Drawings

FIG. 1 is a schematic diagram of the prior art;

fig. 2 is a front view of the present invention.

Wherein: 1. a prefractionation column; 2. a reboiler; 3. a heavy benzene extraction pump; 4. a three-way pipe; 5. a first pipeline; 6. a second pipeline; 7. a third pipeline; 8. a heavy benzene cooler; 9. a feed line; 10. a gas phase outlet; 11. a heavy benzene production pipeline; 12. a first valve; 13. adjusting a valve; 14. a second valve; 15. a third valve; 16. a fourth valve; 17. a fifth valve; 18. a sixth valve; 19. a seventh valve; 20. a prefractionation column of the prior art; 21. a prior art reboiler; 22. a prior art tower bottom pump; 23. heavy benzene coolers of the prior art.

Detailed Description

In order to deepen the understanding of the present invention, the following embodiments will be combined to make the present invention do further details, and the present embodiment is only used for explaining the present invention, and does not constitute the limitation of the protection scope of the present invention.

Example one

According to the illustration in fig. 2, the embodiment provides a benzene hydrogenation prefractionator extraction and transformation system, which comprises a prefractionator 1, a reboiler 2 and a heavy benzene extraction pump 3, wherein a three-way pipe 4 is connected to the bottom of the prefractionator 1, a first pipeline 5 is connected to the lower output end of the three-way pipe 4, the other end of the first pipeline 5 is connected with a side circulation port of the prefractionator 1, the reboiler 2 is communicated with the first pipeline 5, and a second pipeline 6 is connected to the output end of one side of the three-way pipe 4; the heavy benzene extraction pump 3 is a closed shield pump;

the input end of the heavy benzene extraction pump 3 is connected with the output end of the second pipeline 6, the output end of the heavy benzene extraction pump 3 is provided with a third pipeline 7, and the output end of the third pipeline 7 is connected with a heavy benzene cooler 8. When the device is used, materials to be processed are discharged into the pre-distillation tower 1, the three-way pipe 4 is firstly closed to be communicated with the second pipeline 6, the three-way pipe 4 is communicated with the first pipeline 5, the materials circulate in the first pipeline 5 through siphoning, the materials are separated into gas phase and liquid phase through the reboiler 2 and circulate into the pre-distillation tower 1 through the first pipeline 5, the gas phase is discharged upwards, the liquid phase heavy benzene falls to the bottom of the tower, the liquid level of the evaporated part is continuously supplemented at the bottom of the tower due to the static pressure difference, the heavy benzene extraction pump 3 does not participate in circulation, the second pipeline 6 is opened after the reboiler 2 is circularly processed, the first pipeline 5 is closed, the heavy benzene extraction pump 3 extracts the heavy benzene at the bottom of the tower, and one part of the heavy benzene is cooled by the heavy benzene cooler 8 and then is sent into the storage tank.

A feeding pipeline 9 is arranged above one side of the prefractionation tower 1, a gas phase outlet 10 is arranged above the prefractionation tower 1, and the output end of the heavy benzene cooler 8 is connected with a heavy benzene extraction pipeline 11. The feeding pipeline 9 is used for inputting materials to be processed into the pre-distillation tower 1, the reboiler 2 is used for separating the materials into a gas phase and a liquid phase and circulating the gas phase and the liquid phase into the pre-distillation tower 1 through the first pipeline 5, the gas phase outlet 10 is used for discharging a gas phase, and the heavy benzene extraction pipeline 11 is used for discharging liquid phase heavy benzene to a storage tank.

The feeding pipeline 9 is provided with a first valve 12 for closing or opening the feeding pipeline 9, and the heavy benzene extraction pipeline 11 is provided with a regulating valve 13 and a second valve 14. The second valve 14 is used for opening or closing the heavy benzene production pipeline 11, and the regulating valve 13 is used for controlling the flow rate of heavy benzene production.

Example two

the input end of the heavy benzene extraction pump 3 is connected with the output end of the second pipeline 6, the output end of the heavy benzene extraction pump 3 is provided with a third pipeline 7, and the output end of the third pipeline 7 is connected with a heavy benzene cooler 8. When the device is used, materials to be processed are discharged into the prefractionation tower 1, the communication between the three-way pipe 4 and the second pipeline 6 is firstly closed, the communication between the three-way pipe 4 and the first pipeline 5 is communicated, the materials circulate in the first pipeline 5 through siphonage, the materials are separated into gas phase and liquid phase through the reboiler 2 and circulate into the prefractionation tower 1 through the first pipeline 5, the gas phase is discharged upwards, liquid phase heavy benzol falls off at the tower bottom, the liquid level of the evaporated part is continuously supplemented at the tower bottom due to the static pressure difference, the heavy benzol extraction pump 3 does not participate in circulation, the second pipeline 6 is opened after the reboiler 2 is circularly treated, the first pipeline 5 is closed, the heavy benzol extraction pump 3 extracts the heavy benzol at the tower bottom, and one path of the heavy benzol is cooled by the heavy benzol cooler 8 and then is sent into the storage tank.

The input end of the first pipeline 5 is provided with a third valve 15, the input end of the reboiler 2 is provided with a fourth valve 16 on the first pipeline 5, and the output end of the reboiler 2 is provided with a fifth valve 17 on the first pipeline 5. A third valve 15 is used to open or close the first line 5 and a fourth valve 16 and a fifth valve 17 are used to open or close the reboiler 2.

The second pipeline 6 is connected with a sixth valve 18, and the third pipeline 7 is connected with a seventh valve 19. The sixth valve 18 is used to open or close the second line 6. The seventh valve 19 is used to open or close the third line 7.

And a heat source inlet and a heat source outlet are respectively arranged above and below one side of the reboiler 2, and the heat source inlet is used for introducing medium-pressure steam into the reboiler 2 to serve as a heating source. The reboiler 2 is a special heat exchanger that can exchange heat while having a vaporization space. The level of the feed in reboiler 2 and the level of prefractionator 1 are at the same height. The liquid phase is supplied from the bottom of the column into the reboiler 2, the material is expanded and even vaporized by the heat of the medium pressure steam in the reboiler 2, the density is reduced, so that it leaves the vaporization space, usually 25-30% of the liquid phase is vaporized in the reboiler 2, the vaporized two-phase flow is sent back to the prefractionator 1, the gas phase passes upwards through the gas phase outlet 10, and the liquid phase falls to the bottom of the column.

This benzene hydrogenation is fractionating tower in advance 1 bottoms of fractionating tower with the access connection of first pipeline 5, the exit linkage is fractionating tower 1 circulation mouth in advance, it carries out circulation treatment to the material to set up reboiler 2 on first pipeline 5, in this in-process, import and export lug connection, cyclic utilization siphon principle at the bottom of the tower, regard medium pressure steam as the heating source, heavy benzol extraction pump 3 does not participate in the circulation, only discharge heavy benzol after circulation treatment, be difficult for taking gas in the pump, the operation is stable, start-up is convenient and reliable, continuous operation has been realized, the condition has been created for the continuous operation of production. And this device need not tower bottom pump 22, increase heavy benzol extraction pump 3 can, heavy benzol extraction pump 3 is airtight canned shield pump, and is safe high-efficient, has practiced thrift the energy resource consumption, promotes economic benefits. Meanwhile, the operation is simplified, and the risk is reduced.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a benzene hydrogenation is distillation column in advance and is adopted transformation system, includes distillation column (1), reboiler (2) and heavy benzol extraction pump (3) in advance, its characterized in that: the tower bottom of the pre-distillation tower (1) is connected with a three-way pipe (4), the output end of the lower part of the three-way pipe (4) is connected with a first pipeline (5), the other end of the first pipeline (5) is connected with a side circulation port of the pre-distillation tower (1), the reboiler (2) is communicated on the first pipeline (5), and the output end of one side of the three-way pipe (4) is connected with a second pipeline (6);

the input end of the heavy benzene extraction pump (3) is connected with the output end of the second pipeline (6), the output end of the heavy benzene extraction pump (3) is provided with a third pipeline (7), and the output end of the third pipeline (7) is connected with a heavy benzene cooler (8).

2. The extraction and modification system of the benzene hydrogenation prefractionator of claim 1, characterized in that: the device is characterized in that a feeding pipeline (9) is arranged above one side of the pre-distillation tower (1), a gas phase outlet (10) is arranged above the pre-distillation tower (1), and the output end of the heavy benzene cooler (8) is connected with a heavy benzene extraction pipeline (11).

3. The extraction and modification system of the benzene hydrogenation prefractionator of claim 2, characterized in that: the heavy benzene recovery system comprises a pre-distillation tower (1), a reboiler (2), a feeding pipeline (9), a gas-liquid outlet (10), a heavy benzene extraction pipeline (11), a pre-distillation tower (1), a gas-liquid outlet (5), a heavy benzene storage tank and a reboiler, wherein the feeding pipeline (9) is used for inputting materials to be processed into the pre-distillation tower (1), the reboiler (2) is used for separating the materials into a gas phase and a liquid phase and circulating the gas phase into the pre-distillation tower (1) through the first pipeline (5), and the heavy benzene extraction pipeline (11) is used for discharging liquid phase heavy benzene to the storage tank.

4. The extraction and modification system of the benzene hydrogenation prefractionator of claim 3, characterized in that: the heavy benzene recovery device is characterized in that a first valve (12) is arranged on the feeding pipeline (9), and a regulating valve (13) and a second valve (14) are arranged on the heavy benzene recovery pipeline (11).

5. The extraction and modification system of the benzene hydrogenation prefractionator as claimed in claim 4, wherein: the input end department of first pipeline (5) is equipped with third valve (15), reboiler (2) input end department be equipped with fourth valve (16) on first pipeline (5), reboiler (2) output end department be equipped with fifth valve (17) on first pipeline (5).

6. The extraction and modification system of the benzene hydrogenation prefractionator of claim 5, characterized in that: and a sixth valve (18) is connected to the second pipeline (6), and a seventh valve (19) is connected to the third pipeline (7).

7. The extraction and modification system of the benzene hydrogenation prefractionator of claim 6, characterized in that: and the upper part and the lower part of one side of the reboiler (2) are respectively provided with a heat source inlet and a heat source outlet, and the heat source inlet is used for introducing medium-pressure steam into the reboiler (2) to serve as a heating source.