CN214512779U - Vacuum system for extracting three-mixed fraction reduced pressure tar distillation tower - Google Patents
Vacuum system for extracting three-mixed fraction reduced pressure tar distillation tower Download PDFInfo
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- CN214512779U CN214512779U CN202023335676.6U CN202023335676U CN214512779U CN 214512779 U CN214512779 U CN 214512779U CN 202023335676 U CN202023335676 U CN 202023335676U CN 214512779 U CN214512779 U CN 214512779U
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Abstract
The utility model relates to a metallurgical coking technical field especially relates to a vacuum system for adopting three to mix fraction decompression tar distillation towers. Comprises a reflux tank, a vacuum catcher and a vacuum cooler; the reflux tank is divided into two independent first and second chambers by a partition board, the first and second chambers are directly connected with a vacuum catcher, the first and second chambers are connected with a vacuum cooler through pipelines, and the vacuum catcher is connected with the vacuum cooler and a diffusing system through pipelines; the tower top of the reduced pressure tar distillation tower is connected with the first chamber through a pipeline, the first chamber and the second chamber are both connected with a reflux pump through pipelines, and the reflux pump is connected with the tower top of the reduced pressure tar distillation tower through a pipeline. The condensed oil gas content similar to the washing oil in the vacuum air is reduced, the quality of the washing oil of the vacuum circulating liquid is ensured, the running time is increased, and the replacement period is shortened; the temperature of the vacuum air entering the liquid ring vacuum pump is reduced, the normal air pumping capacity of the liquid ring vacuum pump is ensured, and the air pumping capacity of the vacuum pump is not reduced due to overhigh temperature of the entering vacuum air.
Description
Technical Field
The utility model relates to a metallurgical coking technical field especially relates to a vacuum system for adopting three to mix fraction decompression tar distillation towers.
Background
Distillation of tar during coal tar processing is the most basic conventional method for splitting tar under industrial conditions. At present, the domestic tar distillation process is divided into a normal pressure distillation process, an atmospheric-vacuum distillation process and a vacuum distillation process according to pressure; the process is divided into a narrow fraction process and a three-mixed fraction process according to cut fractions, and the narrow fraction process and the three-mixed fraction process are combined to combine different process flows.
Under the premise of determining a narrow-cut or three-mixed-cut product scheme, a tar normal-vacuum continuous distillation process and a tar vacuum continuous distillation process are development trends of tar processing at present and should be preferred. The purpose of the pressure reduction is to reduce the distillation temperature, accelerate the distillation speed and prevent the heating system from coking. And the quality of cut fraction can be improved, and the extraction rate of naphthalene can be improved.
At present, three-mixed oil gas coming out from the top of a reduced pressure tar distillation tower in a three-mixed fraction tar reduced pressure continuous distillation process exchanges heat with raw material tar, then automatically flows to a reflux tank through a three-mixed fraction cooler, the gas at the top of the reflux tank is directly pumped by a liquid ring vacuum pump, gas-liquid mixed liquid at the outlet of the liquid ring vacuum pump is sent to a gas-liquid separation tank, the liquid returns to the vacuum pump through the vacuum liquid cooler and is recycled, the gas is discharged into a diffusing system from the top of the gas-liquid separation tank for treatment, and the negative pressure at the top of the reduced pressure tar distillation tower is adjusted through a vacuum pump traffic pipe adjusting valve.
In the process of adopting the three-mixed fraction tar and carrying out the reduced pressure continuous distillation, a vacuum system is a very important part in the whole process device, and plays a vital role in the whole tar distillation device and the product quality if the vacuum system can be normally, continuously, stably and safely operated. From the problems of feedback from the site, vacuum systems always have more or less such problems, the main ones being as follows:
1) the vacuum contains condensed oil gas with different components, the properties of the oil gas are similar to those of washing oil, and according to the similar compatibility principle, the oil gas similar to the washing oil in the vacuum is absorbed by the washing oil of the vacuum circulating liquid, so that the washing oil quality of the vacuum circulating liquid is reduced quickly, the washing oil of the vacuum circulating liquid needs to be replaced frequently and periodically, and the continuous and stable operation of tar production is seriously influenced.
2) The working temperature of the reflux tank is 80-100 ℃, meanwhile, in order to prevent naphthalene from being separated out in vacuum gas, the accompanying design of a vacuum gas pipeline is adopted, the temperature of the vacuum gas is basically 80-100 ℃, the high temperature is directly introduced into a liquid ring vacuum pump, the temperature of vacuum circulation liquid washing oil is increased, the air extraction capacity of the vacuum pump is insufficient, and the quality of the three-mixed fraction is reduced and even unqualified.
In conclusion, in the process of adopting the three-mixed fraction tar and carrying out the vacuum continuous distillation, the two problems need to be solved urgently so as to ensure the continuous, stable and safe operation of a tar device.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a vacuum system for adopting a three-mixed fraction decompression tar distillation tower, which firstly reduces the condensed oil gas content similar to the washing oil in the vacuum, ensures the quality of the vacuum circulation liquid washing oil, increases the operation time and reduces the replacement period; and secondly, the temperature of the vacuum air entering the liquid ring vacuum pump is reduced, the normal air exhaust capacity of the liquid ring vacuum pump is ensured, and the air exhaust capacity of the vacuum pump is not reduced due to overhigh temperature of the entering vacuum air.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a vacuum system for adopting three-mixed fraction decompression tar distillation tower comprises a reflux tank, a vacuum catcher and a vacuum cooler; the reflux tank is divided into two independent first and second chambers by a partition plate, the first and second chambers are directly connected with a vacuum trap, the first and second chambers are connected with a vacuum cooler through pipelines, and the vacuum trap is connected with the vacuum cooler and a diffusion system through pipelines; the tower top of the reduced pressure tar distillation tower is connected with the first chamber through a pipeline, the first chamber and the second chamber are both connected with a reflux pump through pipelines, and the reflux pump is connected with the tower top of the reduced pressure tar distillation tower through a pipeline.
A mist catcher is arranged on a pipeline connecting the first chamber and the vacuum cooler.
And a regulating valve, a self-operated regulating valve, a liquid ring vacuum pump, a vacuum liquid cooler and a gas-liquid separation tank are arranged on a pipeline connecting the vacuum catcher and the diffusing system, and the liquid ring vacuum pump is connected with the gas-liquid separation tank through a pipeline.
And a heat exchanger and a three-mixed fraction cooler are arranged on a pipeline connected with the first chamber at the top of the reduced pressure tar distillation tower.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the condensed oil gas in the vacuum is separated by the mist catcher, the vacuum cooler and the vacuum cyclone catcher for three times, the content of condensed gas mist drops in the vacuum is reduced to the maximum extent, the content of components similar to washing oil components in the vacuum is greatly reduced, and the circulating washing oil absorbs the components less, so that the pollution to the circulating washing oil is reduced, the quality of the circulating washing oil is effectively ensured, the replacement period of the circulating washing oil is greatly increased, and the strong guarantee is provided for the continuous and stable operation of the vacuum.
2) The vacuum air from the first chamber of the double-chamber reflux tank is cooled by the vacuum cooler, so that the temperature of the vacuum air is reduced to be almost the same as that of the circulating washing oil, and the temperature of the circulating washing oil is hardly increased, so that the temperature of the circulating washing oil is ensured to be stable, the temperature of the circulating washing oil is not influenced due to the high temperature of the vacuum air, and the air suction capacity of the vacuum pump is effectively ensured.
Drawings
Fig. 1 is a schematic structure and a schematic process diagram of the present invention.
In the figure: 1-reduced pressure tar distillation tower 2-raw material tar/three-mixed oil heat exchanger 3-three-mixed fraction cooler 4-double-chamber reflux tank 5-reflux pump 6-mist catcher 7-vacuum cyclone catcher 8-vacuum cooler 9-liquid ring vacuum pump 10-gas-liquid separation tank 11-vacuum liquid cooler 12-partition plate 13-regulating valve 14-self-operated regulating valve 41-first chamber 42-second chamber
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in figure 1, a vacuum system for a vacuum distillation tower for collecting three-mixed fraction and reducing tar comprises a double-chamber reflux tank 4, a vacuum cyclone catcher 7 and a vacuum cooler 8.
The double-chamber reflux groove 4 is divided into two independent first chamber 41 and second chamber 42 by the clapboard 12, the second chamber 42 is directly connected with the vacuum cyclone catcher 7, the first chamber 41 and the second chamber 42 are connected with the vacuum cooler 8 through pipelines, the vacuum cyclone catcher 7 is connected with the vacuum cooler 8 through pipelines, and the vacuum cyclone catcher 7 is connected with the diffusing system through pipelines. The top of the reduced pressure tar distillation tower 1 is connected with the first chamber 41 through a pipeline, and a raw material tar/three-mixed oil heat exchanger 2 and a three-mixed fraction cooler 3 are arranged on the pipeline connecting the top of the reduced pressure tar distillation tower 1 with the first chamber 41.
The first chamber 41 and the second chamber 42 are both connected with a reflux pump 5 through pipelines, and the reflux pump 5 is connected with the top of the reduced pressure tar distillation tower 1 through a pipeline.
A mist trap 6 is provided on the conduit connecting the chamber 41 to the vacuum cooler 8. A self-operated adjusting valve 14, a liquid ring vacuum pump 9, a vacuum liquid cooler 11 and a gas-liquid separation tank 10 are sequentially arranged on a pipeline connecting the vacuum cyclone catcher 7 and the diffusing system, the liquid ring vacuum pump 9 is connected with the gas-liquid separation tank 10 through a pipeline, and an adjusting valve 13 is arranged on a branch pipeline connecting the vacuum cyclone catcher 7 and the diffusing system.
The utility model discloses a theory of operation and working process, including following step:
1) the three-mixed oil gas from the top of the reduced pressure tar distillation tower 1 enters a raw material tar/three-mixed oil heat exchanger 2 for condensation and cooling, then enters a three-mixed fraction cooler 3 for cooling, and the three-mixed oil cooled to 80-100 ℃ enters a first chamber 41 of a double-chamber reflux tank 4; the third mixed oil is pumped out by a reflux pump 5, one part of the third mixed oil is sent back to the top of the vacuum tar distillation tower 1, and the other part of the third mixed oil is sent out;
2) vacuum gas at the top of one chamber 41 of the double-chamber reflux tank 4 sequentially passes through a mist catcher 6, a vacuum cooler 8 and a vacuum cyclone catcher 7 and finally enters a liquid ring vacuum pump 9, gas-liquid mixed liquid is sent into a gas-liquid separation tank 10 by the liquid ring vacuum pump 9, gas-liquid separation is carried out at the gas-liquid separation tank, and the gas enters a diffusion system for unified treatment;
the mist catcher 6 catches oil mist carried in high-temperature vacuum air, then the oil mist enters the vacuum cooler 8 for further cooling, the oil mist which is not caught is changed into oil drops, the oil drops automatically flow to the two chambers 42 of the double-chamber backflow groove 4, and the gas enters the vacuum cyclone catcher 7;
gas from the upper part of the vacuum cooler 8 enters a vacuum cyclone catcher 7, the vacuum gas is finally and thoroughly separated from condensed oil mist, the gas is subjected to cyclone separation and then enters a liquid ring vacuum pump 9 from the top of the middle of the vacuum cyclone catcher 7, and oil drops automatically flow to a second chamber 42 of the double-chamber reflux groove 4 along the side wall of the vacuum cyclone catcher 7;
3) washing oil is selected as circulating liquid of a liquid ring vacuum pump 9 for distilling the reduced pressure tar, enters a vacuum liquid cooler 8 from a gas-liquid separation tank 10, is cooled, and then returns to the liquid ring vacuum pump 9 for recycling;
4) the negative pressure at the top of the reduced pressure tar distillation tower 1 is regulated by a gas traffic pipe regulating valve 13 at the inlet and the outlet of a liquid ring vacuum pump 9, and if the vacuum is not condensed and the gas amount is not enough, nitrogen gas is supplemented by a self-operated regulating valve 14.
The condensed oil gas in the vacuum is separated by the mist catcher 6, the vacuum cooler 8 and the vacuum cyclone catcher 7 for three times, the content of condensed gas mist drops in the vacuum is reduced to the maximum extent, the content of components similar to washing oil components in the vacuum is greatly reduced, and the absorption of the circulating washing oil to the components is reduced, so that the pollution to the circulating washing oil is reduced, the quality of the circulating washing oil is effectively ensured, the replacement period of the circulating washing oil is greatly increased, and the strong guarantee is provided for the continuous and stable operation of the vacuum.
The vacuum air from the first chamber 41 of the double-chamber reflux tank 4 is cooled by the vacuum cooler 8, so that the temperature of the vacuum air is reduced to be almost the same as that of the circulating washing oil, and the temperature of the circulating washing oil is hardly increased, thereby ensuring the stable temperature of the circulating washing oil, not influencing the temperature of the circulating washing oil due to the high temperature of the vacuum air, and effectively ensuring the air exhaust capacity of the vacuum pump.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (4)
1. A vacuum system for adopting a three-mixed fraction decompression tar distillation tower is characterized by comprising a reflux tank, a vacuum catcher and a vacuum cooler; the reflux tank is divided into two independent first and second chambers by a partition plate, the first and second chambers are directly connected with a vacuum trap, the first and second chambers are connected with a vacuum cooler through pipelines, and the vacuum trap is connected with the vacuum cooler and a diffusion system through pipelines; the tower top of the reduced pressure tar distillation tower is connected with the first chamber through a pipeline, the first chamber and the second chamber are both connected with a reflux pump through pipelines, and the reflux pump is connected with the tower top of the reduced pressure tar distillation tower through a pipeline.
2. The vacuum system for the vacuum distillation tower for the recovery of the three-mixed fraction vacuum tar as claimed in claim 1, wherein: a mist catcher is arranged on a pipeline connecting the first chamber and the vacuum cooler.
3. The vacuum system for the vacuum distillation tower for the recovery of the three-mixed fraction vacuum tar as claimed in claim 1, wherein: and a regulating valve, a self-operated regulating valve, a liquid ring vacuum pump, a vacuum liquid cooler and a gas-liquid separation tank are arranged on a pipeline connecting the vacuum catcher and the diffusing system, and the liquid ring vacuum pump is connected with the gas-liquid separation tank through a pipeline.
4. The vacuum system for the vacuum distillation tower for the recovery of the three-mixed fraction vacuum tar as claimed in claim 1, wherein: and a heat exchanger and a three-mixed fraction cooler are arranged on a pipeline connected with the first chamber at the top of the reduced pressure tar distillation tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023335676.6U CN214512779U (en) | 2020-12-30 | 2020-12-30 | Vacuum system for extracting three-mixed fraction reduced pressure tar distillation tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023335676.6U CN214512779U (en) | 2020-12-30 | 2020-12-30 | Vacuum system for extracting three-mixed fraction reduced pressure tar distillation tower |
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| CN214512779U true CN214512779U (en) | 2021-10-29 |
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| CN202023335676.6U Active CN214512779U (en) | 2020-12-30 | 2020-12-30 | Vacuum system for extracting three-mixed fraction reduced pressure tar distillation tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112691400A (en) * | 2020-12-30 | 2021-04-23 | 中冶焦耐(大连)工程技术有限公司 | Vacuum system and process for distillation tower for collecting three-mixed fraction vacuum tar |
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2020
- 2020-12-30 CN CN202023335676.6U patent/CN214512779U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112691400A (en) * | 2020-12-30 | 2021-04-23 | 中冶焦耐(大连)工程技术有限公司 | Vacuum system and process for distillation tower for collecting three-mixed fraction vacuum tar |
| CN112691400B (en) * | 2020-12-30 | 2023-09-19 | 中冶焦耐(大连)工程技术有限公司 | Vacuum system and process for three-mixed fraction decompression tar distillation tower |
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