CN218187951U - Crude benzol noncondensable gas recovery system - Google Patents
Crude benzol noncondensable gas recovery system Download PDFInfo
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- CN218187951U CN218187951U CN202222672104.XU CN202222672104U CN218187951U CN 218187951 U CN218187951 U CN 218187951U CN 202222672104 U CN202222672104 U CN 202222672104U CN 218187951 U CN218187951 U CN 218187951U
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Abstract
The utility model discloses a crude benzol noncondensable gas recovery system, which comprises a debenzolization tower, wherein the top of the debenzolization tower is provided with a steam exhaust pipeline; be provided with crude benzene cooler on the exhaust steam pipe way in debenzolization tower rear, be provided with vapour and liquid separator on the exhaust steam pipe way in crude benzene cooler rear, the liquid outlet pipe way of vapour and liquid separator bottom is connected with crude benzene oil water separator, the play steam pipe way at vapour and liquid separator top is connected with the scrubbing tower, the play liquid end of scrubbing tower bottom is connected with rich oil groove, scrubbing tower top exhaust steam pipe way has circulating water tank through vacuum pump connection, circulating water tank's top is connected with on the negative pressure gas pipeline, negative pressure gas pipeline's rear is connected with the air-blower. The utility model discloses to take off benzene tower exhaust crude benzol steam and carry out heat transfer, separation, washing back, retrieve the crude benzol in the crude benzol steam, improved the output of crude benzol to control from the pollutant source, avoided crude benzol noncondensable gas excessive, improved the environment around the factory greatly.
Description
Technical Field
The utility model relates to the technical field, more specifically relate to a crude benzol noncondensable gas recovery system.
Background
The crude benzene is one of the products in the crude gas generated by coal pyrolysis, and the deaminated coke oven gas contains benzene compounds, wherein the benzene content is the main content and is called as the crude benzene.
In the crude benzene recovery production process, a debenzolization tower is mostly used to make the benzene hydrocarbon dissolved in a washing oil solvent release through a direct contact heat transfer surface of a heat carrier, a heating agent is adopted during recovery to make the equilibrium vapor pressure of the crude benzene on the liquid level of the washing oil greater than the partial pressure of the crude benzene in the heat carrier, vapor-liquid countercurrent contact is carried out to carry out mass transfer and heat transfer, so that the crude benzene is released from rich oil, a mixture of benzene vapor and steam is obtained at the tower top, and purer lean oil is obtained at the tower bottom.
However, in the process of crude benzene recovery production, the recovery rate of crude benzene is often influenced due to the instability of system pressure, and meanwhile, a part of crude benzene non-condensable gas can be directly discharged into air at the top end of the debenzolization tower, so that the environmental impact is serious.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that needs to solve provides a crude benzol noncondensable gas recovery system, improves crude benzol output, avoids crude benzol noncondensable gas excessive, avoids environmental pollution.
In order to solve the technical problem, the utility model adopts the following technical proposal.
A crude benzene noncondensable gas recovery system comprises a debenzolization tower, wherein a steam exhaust pipeline for exhausting crude benzene steam is arranged at the top of the debenzolization tower; the system is characterized in that a crude benzene cooler used for cooling discharged crude benzene steam is arranged on a steam exhaust pipeline behind the debenzolization tower, a steam-liquid separator used for separating the crude benzene steam is arranged on the steam exhaust pipeline behind the crude benzene cooler, a liquid outlet pipeline at the bottom of the steam-liquid separator is connected with a crude benzene oil-water separator used for separating oil and water from the crude benzene, a steam outlet pipeline at the top of the steam-liquid separator is connected with a washing tower used for washing the crude benzene in the crude benzene steam, a liquid outlet end at the bottom of the washing tower is connected with an oil rich tank, the steam exhaust pipeline at the top of the washing tower is connected with a circulating water tank through a vacuum pump, the top of the circulating water tank is connected with a negative pressure gas pipeline for recovering steam of non-condensable gas, and an air blower used for extracting the non-condensable gas in the circulating water tank is connected to the rear side of the negative pressure gas pipeline.
Further optimizing the technical scheme, an oil-gas heat exchanger for recovering the waste heat of the crude benzene steam is arranged on a steam exhaust pipeline between the debenzolization tower and the crude benzene cooler.
According to the technical scheme, the vapor-liquid separator comprises a first vapor-liquid separator connected to the crude benzene cooler and a second vapor-liquid separator connected to a vapor outlet pipeline of the first vapor-liquid separator, liquid outlet ends of the bottoms of the first vapor-liquid separator and the second vapor-liquid separator are connected to the crude benzene oil-water separator, and a vapor outlet pipeline of the second vapor-liquid separator is connected to the washing tower.
According to the technical scheme, the crude benzene oil-water separator comprises a crude benzene separator and a separation water tank, the crude benzene separator is connected to liquid outlet pipelines at the bottoms of the first vapor-liquid separator and the second vapor-liquid separator, the separation water tank is connected to the crude benzene separator, and the separation water tank is connected to the circulating water tank through a pipeline.
Further optimizing the technical scheme, the washing tower is connected with a lean oil pipe.
Due to the adoption of the technical scheme, the utility model has the following technical progress.
The utility model discloses to take off benzene tower exhaust crude benzol steam and carry out heat transfer, separation, washing back, retrieve the crude benzol in the crude benzol steam, improved the output of crude benzol to control from the pollutant source, avoided crude benzol noncondensable gas excessive, improved the environment around the factory greatly, still recycle the heat in the crude benzol steam simultaneously, improved resource utilization.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein: 1. the system comprises a debenzolization tower, 2 oil-gas heat exchangers, 3 crude benzene coolers, 4 first gas-liquid separators, 5 second gas-liquid separators, 6 washing towers, 7 lean oil pipes, 8 oil-rich tanks, 9 vacuum pumps, 10 circulating water tanks, 11 negative pressure gas pipelines, 12 crude benzene separators and 13 separating water tanks.
Detailed Description
The present invention will be described in further detail with reference to the drawings and specific embodiments.
A crude benzene noncondensable gas recovery system is shown in figure 1 and comprises a debenzolization tower 1, a crude benzene cooler 3, a gas-liquid separator, a crude benzene oil-water separator, a washing tower 6 and an oil-rich tank 8. The top of the debenzolization tower 1 is provided with a steam exhaust pipeline, and the crude benzene cooler 3 is arranged on the steam exhaust pipeline behind the debenzolization tower 1 and is used for cooling the high-temperature crude benzene steam discharged from the debenzolization tower 1; the vapor-liquid separator is arranged behind the crude benzene cooler 3 and is used for separating crude benzene steam; the crude benzene oil-water separator is arranged on a liquid outlet pipeline at the bottom of the vapor-liquid separator and is used for separating oil from water in crude benzene; the washing tower 6 is arranged on a steam outlet pipeline at the top of the steam-liquid separator of the control group and is used for washing crude benzene in the crude benzene steam; the rich oil groove 8 is connected to the liquid outlet end at the bottom of the washing tower 6 and is used for collecting the rich oil after washing; the top steam exhaust pipeline of the washing tower 6 is connected with a circulating water tank 10 through a vacuum pump 9, the top of the circulating water tank is connected with a negative pressure gas pipeline 11 and used for recovering the treated non-condensable gas, and the rear part of the negative pressure gas pipeline 11 is connected with an air blower and used for pumping the non-condensable gas in the circulating water tank 10.
Because the temperature ratio of the crude benzene steam of debenzolization tower 1 exhaust is higher, in order to avoid the heat waste in the crude benzene steam, be provided with oil vapour heat exchanger 2 on the exhaust steam pipe between debenzolization tower 1 and crude benzene cooler 3, carry out the heat transfer and recycle to the heat in the crude benzene steam, can also carry out preliminary cooling to crude benzene steam.
The crude benzene steam after heat exchange by the oil-gas heat exchanger 2 enters the crude benzene cooler 3, is cooled again, and then enters the gas-liquid separator for steam-liquid separation.
The vapor-liquid separator includes first vapor-liquid separator 4 and second vapor-liquid separator 5, the height that first vapor-liquid separator 4 and second vapor-liquid separator 5 set up is different, first vapor-liquid separator 4 is connected on the play steam conduit of crude benzole cooler, second vapor-liquid separator 5 is connected on the play steam conduit of first vapor-liquid separator 4, the play liquid end of first vapor-liquid separator 4 and second vapor-liquid separator 5 bottom all is connected on crude benzole water oil separator, second vapor-liquid separator's play steam conduit coupling is on scrubbing tower 6.
The crude benzene is separated step by step through a first vapor-liquid separator 4 and a second vapor-liquid separator 5, and the separated liquid enters the crude benzene oil-water separation to separate oil and water in the liquid.
The crude benzene oil-water separation device comprises a crude benzene separator 12 and a separation water tank 13, wherein the crude benzene separator 12 is connected to liquid outlet pipelines at the bottoms of the first vapor-liquid separator 4 and the second vapor-liquid separator 5 and used for separating oil and water in liquid, the separation water tank 13 is connected to the crude benzene separator 12, the circulating water tank 10 is connected to the separation water tank through a pipeline, and non-condensable gas in the separation water tank 13 enters the circulating water tank 10 and is discharged through a negative pressure gas pipeline 11.
On noncondensable gas that separates out through first vapour and liquid separator 4 and second vapour and liquid separator 5 got into scrubbing tower 6 at rear, be connected with lean oil pipe 7 on the scrubbing tower 6, get into the lean oil in the scrubbing tower 6, wash the noncondensable gas in the scrubbing tower through the lean oil, absorb the crude benzole in the noncondensable gas, the rich oil that has absorbed the crude benzole flows into rich oil groove 8 through the pipeline and stores, has realized the crude benzole recovery in the crude benzole steam.
The noncondensable gas at the top of the washing tower 6 is sent into the circulating water tank 10 by the vacuum pump through a pipeline and then passes through the negative pressure gas pipeline, so that the crude benzol noncondensable gas is prevented from overflowing, the environmental pollution is avoided, and the environment around a plant area is improved.
Claims (5)
1. A crude benzene noncondensable gas recovery system comprises a debenzolization tower (1), wherein the top of the debenzolization tower (1) is provided with a steam exhaust pipeline for exhausting crude benzene steam; the method is characterized in that: the system is characterized in that a crude benzene cooler (3) used for cooling and cooling discharged crude benzene steam is arranged on a steam exhaust pipeline behind the debenzolization tower (1), a steam-liquid separator used for separating the crude benzene steam is arranged on the steam exhaust pipeline behind the crude benzene cooler (3), a liquid outlet pipeline at the bottom of the steam-liquid separator is connected with a crude benzene oil-water separator used for separating crude benzene oil and water, a steam outlet pipeline at the top of the steam-liquid separator is connected with a washing tower (6) used for washing crude benzene in the crude benzene steam, a liquid outlet end at the bottom of the washing tower (6) is connected with an oil-rich tank (8), a steam exhaust pipeline at the top of the washing tower (6) is connected with a circulating water tank (10) through a vacuum pump (9), the top of the circulating water tank (10) is connected with a negative pressure gas pipeline (11) for recovering steam of non-condensable gas, and an air blower used for extracting the non-condensable gas in the circulating water tank (10) is connected to the rear of the negative pressure gas pipeline (11).
2. The crude benzene noncondensable gas recovery system according to claim 1, wherein: an oil-gas heat exchanger (2) for recovering the residual heat of the crude benzene steam is arranged on a steam exhaust pipeline between the debenzolization tower (1) and the crude benzene cooler (3).
3. The crude benzene noncondensable gas recovery system of claim 1, wherein: the vapor-liquid separator comprises a first vapor-liquid separator (4) connected to the crude benzene cooler (3) and a second vapor-liquid separator (5) connected to a vapor outlet pipeline of the first vapor-liquid separator (4), liquid outlet ends of the bottoms of the first vapor-liquid separator (4) and the second vapor-liquid separator (5) are connected to the crude benzene oil-water separator, and a vapor outlet pipeline of the second vapor-liquid separator (5) is connected to the washing tower (6).
4. The system for recovering the non-condensable gas of crude benzene as claimed in claim 3, wherein: the crude benzene oil-water separator comprises a crude benzene separator (12) connected to liquid outlet pipelines at the bottoms of the first vapor-liquid separator (4) and the second vapor-liquid separator (5) and a separation water tank (13) connected to the crude benzene separator (12), and the separation water tank (13) is connected to the circulating water tank (10) through a pipeline.
5. The crude benzene noncondensable gas recovery system according to claim 1, wherein: and the washing tower (6) is connected with a lean oil pipe (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222672104.XU CN218187951U (en) | 2022-10-11 | 2022-10-11 | Crude benzol noncondensable gas recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222672104.XU CN218187951U (en) | 2022-10-11 | 2022-10-11 | Crude benzol noncondensable gas recovery system |
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| Publication Number | Publication Date |
|---|---|
| CN218187951U true CN218187951U (en) | 2023-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222672104.XU Active CN218187951U (en) | 2022-10-11 | 2022-10-11 | Crude benzol noncondensable gas recovery system |
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| CN (1) | CN218187951U (en) |
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2022
- 2022-10-11 CN CN202222672104.XU patent/CN218187951U/en active Active
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