CN215781600U - System for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt - Google Patents
System for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt Download PDFInfo
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- CN215781600U CN215781600U CN202121841599.3U CN202121841599U CN215781600U CN 215781600 U CN215781600 U CN 215781600U CN 202121841599 U CN202121841599 U CN 202121841599U CN 215781600 U CN215781600 U CN 215781600U
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Abstract
The utility model relates to the technical field of coking heavy benzene flash evaporation, in particular to a system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt. An outlet pipeline of the tar fraction tower is connected with a heavy benzene asphalt heat exchanger, the heavy benzene pipeline is connected with the heavy benzene asphalt heat exchanger, the heavy benzene asphalt heat exchanger is connected with a medium temperature asphalt delivery pipeline, and an outlet pipeline of the heavy benzene asphalt heat exchanger is connected with a heavy benzene flash tower; heavy benzene flash column bottom export links to each other with heavy residual oil outward delivery pipeline, and heavy benzene flash column top outlet line links to each other with the miscella reflux drum, and miscella reflux drum outlet line links to each other with heavy benzene flash column upper portion entry, and miscella reflux drum outlet line links to each other with the miscella outward delivery pipeline. The utility model utilizes the residual heat of the asphalt to heat the heavy benzene, and then the heavy benzene is sent to the heavy benzene flash tower to be flashed, and the light components of the phenol oil, the naphthalene oil and the wash oil fraction in the heavy benzene are recovered, thereby improving the product yield of the corresponding fraction and greatly improving the benefit of enterprises.
Description
Technical Field
The utility model relates to the technical field of coking heavy benzene flash evaporation, in particular to a system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt.
Background
At present, a gas purification device in the coking industry generally comprises a crude benzene distillation unit, and the crude benzene distillation unit conventionally produces light benzene and heavy benzene products. And a part of heavy benzene is produced in the benzene hydrogenation unit although the main products are pure benzene, toluene, xylene, etc. The heavy benzene produced in the crude benzene distillation unit or the benzene hydrogenation device contains a large amount of light components, the light components mainly comprise phenol oil, naphthalene oil, wash oil and the like, the content of the light components is about 40-75%, the light components are not well utilized at present, and the fraction is urgently needed to be recycled as the raw material of the industrial naphthalene device, so that the value of the product is maximally improved.
Medium-temperature asphalt with the temperature of about 370 ℃ is generally produced at the bottom of a tar fractionating tower of the tar processing device, the asphalt with the temperature is generally directly cooled and formed, and the heat is wasted.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt. The heavy benzene is heated by the waste heat of the asphalt and then sent to a heavy benzene flash tower for flash evaporation, and light components of phenol oil, naphthalene oil and wash oil fractions in the heavy benzene are recovered, so that the product yield of corresponding fractions is improved, and the benefit of enterprises is greatly improved.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt comprises a tar fraction tower, a heavy benzene asphalt heat exchanger, a heavy benzene flash tower and a mixed oil reflux tank; an outlet pipeline of the tar fraction tower is connected with a heavy benzene asphalt heat exchanger, the heavy benzene pipeline is connected with the heavy benzene asphalt heat exchanger, the heavy benzene asphalt heat exchanger is connected with a medium temperature asphalt delivery pipeline, and an outlet pipeline of the heavy benzene asphalt heat exchanger is connected with a heavy benzene flash tower; heavy benzene flash column bottom export links to each other with heavy residual oil outward delivery pipeline, and the lateral pipeline of heavy residual oil outward delivery pipeline links to each other with heavy benzene flash column bottom entry, and heavy benzene flash column top outlet pipe line links to each other with the miscella reflux drum, and miscella reflux drum outlet pipe line links to each other with heavy benzene flash column upper portion entry, and miscella reflux drum outlet pipe line links to each other with the miscella outward delivery pipeline.
And a medium-temperature pitch delivery pump is arranged on an outlet pipeline of the tar fraction tower.
And a heavy residual oil delivery pump is arranged on the heavy residual oil delivery pipeline.
And a heavy residual oil cooler is arranged on the heavy residual oil delivery pipeline.
And a mixed oil reflux pump is arranged on an outlet pipeline of the mixed oil reflux groove.
And a mixed oil cooler is arranged on an outlet pipeline at the top of the heavy benzene flash tower.
The lower part of the heavy benzene flash tower is thick and the upper part of the heavy benzene flash tower is thin, and the bottom of the heavy benzene flash tower is conical.
Compared with the prior art, the utility model has the beneficial effects that:
1) the waste heat of the medium-temperature asphalt at the bottom of the tar fraction tower is used as a heat source, a heating furnace is not needed, fuel gas is not needed, and a good energy-saving effect is achieved;
2) the mixed fractions of the phenol oil, the naphthalene oil and the wash oil are directly recovered from the top of the heavy benzene flash tower without being respectively collected from a lateral line, the cooling equipment and the process pipeline are simple, and the total investment of the device is greatly reduced;
3) the heavy benzene is low in price as a product, the phenol oil, the naphthalene oil and the washing oil fraction are recovered, the product yield of the corresponding fraction is increased, and the product benefit is maximized;
4) the shape of the bottom of the heavy benzene flash tower is thick at the bottom and thin at the top, which is beneficial to the flash evaporation of light components, and the tower bottom cone section is provided with a heavy residual oil circulation pipeline, thereby effectively preventing the problem of tower bottom blockage;
5) the process flow has less equipment, simple operation and convenient maintenance and management.
Drawings
FIG. 1 is a schematic diagram of the structure and process of the present invention.
In the figure: 1-tar fractionating tower 2-medium temperature asphalt delivery pump 3-heavy benzene/asphalt heat exchanger 4-heavy benzene flash tower 5-heavy residual oil delivery pump 6-heavy residual oil cooler 7-mixed oil cooler 8-mixed oil reflux tank 9-mixed oil reflux pump
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1, a system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt comprises a tar fractionating tower 1, a medium-temperature asphalt delivery pump 2, a heavy benzene/asphalt heat exchanger 3, a heavy benzene flash tower 4, a heavy residual oil delivery pump 5, a heavy residual oil cooler 6, a mixed oil cooler 7, a mixed oil reflux tank 8 and a mixed oil reflux pump 9.
The outlet pipeline of the tar fractionating tower is provided with a medium temperature pitch delivery pump 2 and is connected with the inlet of a heavy benzene/pitch heat exchanger 3. The heavy benzene pipeline is connected with the inlet of the heavy benzene/asphalt heat exchanger 3, the outlet pipeline of the heavy benzene/asphalt heat exchanger 3 is connected with the middle part of the heavy benzene flash tower 4, and the outlet of the heavy benzene/asphalt heat exchanger 3 is connected with the medium-temperature asphalt delivery pipeline.
An outlet at the bottom of the heavy benzene flash tower 4 is connected with a heavy residual oil delivery pipeline, and a heavy residual oil delivery pump 5 and a heavy residual oil cooler 6 are sequentially arranged on the heavy residual oil delivery pipeline. A pipeline is led from the outlet of the heavy residual oil delivery pump 5 to the bottom of the heavy benzene flash tower 4, namely a branch pipeline of the heavy residual oil delivery pipeline is connected with the inlet at the bottom of the heavy benzene flash tower 4.
An outlet pipeline at the top of the heavy benzene flash tower 4 is connected with a mixed oil reflux tank 8, and a mixed oil cooler 7 is arranged on the outlet pipeline at the top of the heavy benzene flash tower. The lower part of the heavy benzene flash tower 4 is thick and the upper part is thin, and the bottom is conical.
An outlet pipeline at the bottom of the mixed oil reflux tank 8 is connected with an inlet at the upper part of the heavy benzene flash tower 4, and a mixed oil reflux pump 9 is arranged on the outlet pipeline at the bottom of the mixed oil reflux tank 8. The outlet pipeline of the mixed oil return tank is connected with a mixed oil delivery pipeline.
The process principle and the working process of the utility model are as follows:
the medium temperature pitch at the bottom of the tar fraction tower 1 exchanges heat with the heavy benzene sent out. The medium temperature pitch at the bottom of the tar fractionating tower 1 is pumped into a heavy benzene/pitch heat exchanger 3 through a medium temperature pitch delivery pump 2, heat exchange is carried out between the medium temperature pitch and external heavy benzene, and the heated heavy benzene is directly sent to the lower section of a heavy benzene flash tower 4 for flash evaporation. And (5) conveying the medium-temperature asphalt outwards for continuous cooling.
And (3) carrying out flash evaporation on the heavy benzene, and recovering the mixed fraction of the phenol oil, the naphthalene oil and the wash oil in the heavy benzene. The heated heavy benzene enters the lower section of a heavy benzene flash tower 4, light components such as phenol oil, naphthalene oil and wash oil fraction in the heavy benzene are separated from heavy residual oil due to pressure change, the light components enter the upper section of the heavy benzene flash tower 4 due to light density, the heavy components such as the heavy residual oil in the heavy benzene continuously sink at the lower section of the heavy benzene flash tower 4, the heavy residual oil can accumulate to a certain liquid level along with the increase of the feeding amount, and then the heavy residual oil is cooled by a heavy residual oil cooler 6 by a heavy residual oil conveying pump 5 and then is sent out. In order to prevent the heavy residual oil accumulated at the bottom of the heavy benzene flash tower 4 from being deposited and blocked, a pipeline is led from the outlet of the heavy residual oil delivery pump 5 to return to the bottom of the heavy benzene flash tower 4 for circulation, so that the blockage of the heavy benzene residual oil is effectively prevented. The heavy residual oil can be distributed to fuel oil for sale or added to the raw material for producing delayed coking.
The mixed fraction of phenol oil, naphthalene oil and wash oil extracted from the top of the heavy benzene flash tower 4 is cooled by a mixed oil cooler 7, then automatically flows to a mixed oil reflux tank 8, is pumped out by a mixed oil reflux pump 9, and one part of the mixed oil is returned to the heavy benzene flash tower 4 as reflux and the other part of the mixed oil is sent out. The mixed oil can be added into the raw material of industrial naphthalene production equipment to further extract phenol oil, industrial naphthalene and wash oil, so that the product yield of corresponding fractions is increased, and the benefit of enterprises is greatly increased.
The heat source of the process is to heat heavy benzene by using the waste heat of the asphalt, then send the heavy benzene to a heavy benzene flash tower for flash evaporation, and recover light components of phenol oil, naphthalene oil and wash oil fractions in the heavy benzene, thereby improving the product yield of corresponding fractions and greatly improving the benefit of enterprises.
The heavy benzene flash tower 4 directly recovers the mixed fraction of the phenol oil, the naphthalene oil and the wash oil from the top of the tower without adopting the mixed fraction from a lateral line, has simple cooling equipment and process pipelines, and greatly reduces the total investment of the device. The heavy benzene is low in price as a product, the phenol oil, the naphthalene oil and the washing oil fraction are recovered, the product yield of the corresponding fraction is increased, and the product benefit is maximized;
the heavy benzene flash tower 4 has a shape of a thick lower part and a thin upper part, so that light components can be flashed, and a tower bottom conical section is provided with a heavy residual oil circulating pipeline, so that the problem of tower bottom blockage is effectively prevented; the process flow has less equipment, simple operation and convenient maintenance and management.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (7)
1. A system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt is characterized by comprising a tar fraction tower, a heavy benzene asphalt heat exchanger, a heavy benzene flash tower and a mixed oil reflux tank; an outlet pipeline of the tar fraction tower is connected with a heavy benzene asphalt heat exchanger, the heavy benzene pipeline is connected with the heavy benzene asphalt heat exchanger, the heavy benzene asphalt heat exchanger is connected with a medium temperature asphalt delivery pipeline, and an outlet pipeline of the heavy benzene asphalt heat exchanger is connected with a heavy benzene flash tower; heavy benzene flash column bottom export links to each other with heavy residual oil outward delivery pipeline, and the lateral pipeline of heavy residual oil outward delivery pipeline links to each other with heavy benzene flash column bottom entry, and heavy benzene flash column top outlet pipe line links to each other with the miscella reflux drum, and miscella reflux drum outlet pipe line links to each other with heavy benzene flash column upper portion entry, and miscella reflux drum outlet pipe line links to each other with the miscella outward delivery pipeline.
2. The system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt as claimed in claim 1, wherein a medium-temperature asphalt delivery pump is arranged on an outlet pipeline of the tar fractionating tower.
3. The system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt according to claim 1, wherein a heavy residual oil delivery pump is arranged on the heavy residual oil delivery pipeline.
4. The system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt according to claim 1, wherein a heavy residual oil cooler is arranged on the heavy residual oil delivery pipeline.
5. The system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt as claimed in claim 1, wherein a mixed oil reflux pump is arranged on an outlet pipeline of the mixed oil reflux tank.
6. The system for recovering the light components in the heavy benzene by using the afterheat of the medium-temperature asphalt as claimed in claim 1, wherein a mixed oil cooler is arranged on an outlet pipeline at the top of the heavy benzene flash tower.
7. The system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt as claimed in claim 1, wherein the bottom of the heavy benzene flash tower is thick and the top is thin, and the bottom is conical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121841599.3U CN215781600U (en) | 2021-08-09 | 2021-08-09 | System for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121841599.3U CN215781600U (en) | 2021-08-09 | 2021-08-09 | System for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt |
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| CN215781600U true CN215781600U (en) | 2022-02-11 |
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| CN202121841599.3U Active CN215781600U (en) | 2021-08-09 | 2021-08-09 | System for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113559541A (en) * | 2021-08-09 | 2021-10-29 | 中冶焦耐(大连)工程技术有限公司 | Process and system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt |
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2021
- 2021-08-09 CN CN202121841599.3U patent/CN215781600U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113559541A (en) * | 2021-08-09 | 2021-10-29 | 中冶焦耐(大连)工程技术有限公司 | Process and system for recovering light components in heavy benzene by using waste heat of medium-temperature asphalt |
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