CN215517291U - System for removing hydrogen sulfide from liquefied petroleum gas - Google Patents
System for removing hydrogen sulfide from liquefied petroleum gas Download PDFInfo
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- CN215517291U CN215517291U CN202121201533.8U CN202121201533U CN215517291U CN 215517291 U CN215517291 U CN 215517291U CN 202121201533 U CN202121201533 U CN 202121201533U CN 215517291 U CN215517291 U CN 215517291U
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Abstract
The utility model discloses a system for removing hydrogen sulfide from liquefied petroleum gas, which comprises a primary desulfurization mixer group, a primary settling separation tank, a secondary desulfurization mixer group and a secondary settling separation tank; the inlet of the primary desulfurization mixer group is respectively connected with a liquefied petroleum gas and lean amine liquid conveying pipeline, and the outlet of the primary desulfurization mixer group is connected with the liquid inlet of the primary settling separation tank; the liquefied petroleum gas outlet of the primary settling separation tank is respectively connected with the inlet of the secondary desulfurization mixer group and the purified gas collecting pipeline, and the rich amine liquid outlet is connected with the rich amine liquid regeneration pipeline; the outlet of the secondary desulfurization mixer group is connected with the liquid inlet of the secondary sedimentation separation tank; and a liquefied petroleum gas outlet of the secondary sedimentation separation tank is connected with a purified gas collection pipeline, and an amine-rich liquid outlet is connected with an amine-rich liquid regeneration pipeline. The utility model combines the two-stage desulfurization mixer and the settling separation tank to remove the hydrogen sulfide, the device is not easy to block and the flow is flexible and changeable in the desulfurization process, thereby ensuring the quality of the desulfurized liquefied petroleum gas.
Description
Technical Field
The utility model relates to the technical field of liquefied petroleum gas purification devices, in particular to a system for removing hydrogen sulfide from liquefied petroleum gas.
Background
With the economic development, the demand of liquefied petroleum gas in various countries in the world is gradually rising, and particularly, the demand of the liquefied petroleum gas as a chemical raw material is rapidly increasing, but the liquefied petroleum gas contains H2S and CO2Equal impurities, H2S and CO2The presence of such acidic components can have a very adverse effect on downstream product processing, environmental protection, and equipment corrosion protection. Therefore, the desulfurization of the liquefied petroleum gas and the detection of sulfides thereof are important links in the production and detection of the liquefied petroleum gas.
In the prior art, the liquefied petroleum gas desulfurization method mainly comprises a wet method and a dry method, and the wet method desulfurization has high efficiency and simple operation, so the wet method desulfurization is widely applied to industry. The wet method for removing hydrogen sulfide from liquefied petroleum gas mainly adopts an amine elution sulfur method, and the amine elution sulfur of the existing liquefied petroleum gas is generally carried out in a desulfurizing tower, for example, the publication of the Chinese patent document, "a device and a method for removing hydrogen sulfide from liquefied petroleum gas", discloses a device for removing hydrogen sulfide from liquefied petroleum gas with the publication of CN102757832A, and comprises a liquid film absorption tower and an amine liquid output system. The method comprises the following steps: respectively inputting fresh amine liquid or regenerated lean amine liquid from the top end and the upper side end of the liquid membrane absorption tower, and obtaining separated primary refined liquefied petroleum gas and primary amine-rich liquid in a first separation tank; obtaining separated secondary refined liquefied petroleum gas and secondary amine-rich liquid; secondly, obtaining the separated tertiary refined liquefied petroleum gas and tertiary amine-rich liquid, and enabling the tertiary refined liquefied petroleum gas to enter a mercaptan removal unit for treatment after the tertiary refined liquefied petroleum gas is subjected to amine removal; and entering an amine liquid regeneration system for regeneration.
However, when the desulfurizing tower is used for removing hydrogen sulfide in the liquefied petroleum gas, if the liquefied petroleum gas contains more impurities, the blocking probability of the desulfurizing tower is greatly improved, the desulfurizing effect is influenced, and the quality of the desulfurized liquefied petroleum gas is reduced.
Disclosure of Invention
The utility model provides a system for removing hydrogen sulfide from liquefied petroleum gas, which aims to overcome the problems that when a desulfurizing tower is adopted to remove hydrogen sulfide from the liquefied petroleum gas in the prior art, if the liquefied petroleum gas contains more impurities, the blocking probability of the desulfurizing tower is greatly improved, the desulfurizing effect is influenced, and the quality of the desulfurized liquefied petroleum gas is reduced.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a system for removing hydrogen sulfide from liquefied petroleum gas comprises a primary desulfurization mixer group, a primary settling separation tank, a secondary desulfurization mixer group and a secondary settling separation tank which are sequentially arranged; a liquid inlet, a liquefied petroleum gas outlet and an amine-rich liquid outlet are respectively arranged on the primary sedimentation separating tank and the secondary sedimentation separating tank; the inlet of the primary desulfurization mixer group is respectively connected with a liquefied petroleum gas conveying pipeline and a lean amine liquid conveying pipeline, and the outlet of the primary desulfurization mixer group is connected with the liquid inlet of the primary settling separation tank through a pipeline; the liquefied petroleum gas outlet of the primary settling separation tank is respectively connected with the inlet of the secondary desulfurization mixer group and the purified gas collecting pipeline, and the rich amine liquid outlet of the primary settling separation tank is connected with the rich amine liquid regeneration pipeline; the inlet of the second-stage desulfurization mixer group is respectively connected with the liquefied petroleum gas outlet of the first-stage settling separation tank, a liquefied petroleum gas conveying pipeline and an amine-poor liquid conveying pipeline, and the outlet of the second-stage desulfurization mixer group is connected with the liquid inlet of the second-stage settling separation tank through a pipeline; and a liquefied petroleum gas outlet of the secondary sedimentation separation tank is connected with a purified gas collection pipeline, and an amine-rich liquid outlet of the secondary sedimentation separation tank is connected with an amine-rich liquid regeneration pipeline.
The hydrogen sulfide in the liquefied petroleum gas is removed by combining a desulfurization mixer group and a settling separation tank, the liquefied petroleum gas and the lean amine liquid are mixed in the desulfurization mixer group, and the lean amine liquid is used for absorbing the hydrogen sulfide in the liquefied petroleum gas; and then the mixed solution enters a settling separation tank, settling separation is carried out by utilizing the density difference between the amine solution and the liquefied petroleum gas, finally the desulfurized liquefied petroleum gas is obtained at the upper part of the settling separation tank, and the amine-rich solution is obtained at the lower part of the settling separation tank. The device is not easy to be blocked in the desulfurization process, and the quality of the desulfurized liquefied petroleum gas is ensured.
In addition, the system is provided with a two-stage desulfurization mixer group and a settling separation tank, and the two stages can work independently or in series: firstly, respectively conveying liquefied petroleum gas and lean amine liquid to a primary desulfurization mixer group through a liquefied petroleum gas conveying pipeline and a lean amine liquid conveying pipeline for mixing, pre-desulfurizing the liquefied petroleum gas, and then, feeding the mixed liquid into a primary settling separation tank for separation; the separated rich amine liquid enters a subsequent regeneration procedure through a rich amine liquid regeneration pipeline for regeneration, and the pre-desulfurized liquefied petroleum gas obtained by separation enters a secondary desulfurization mixer group and is mixed with the lean amine liquid conveyed to the secondary desulfurization mixer group through a lean amine liquid conveying pipeline for further desulfurization; and then the mixed liquor enters a secondary sedimentation separation tank for separation, the separated rich amine liquid enters a subsequent regeneration process for regeneration through a rich amine liquid regeneration pipeline, and the desulfurized liquefied petroleum gas obtained by separation enters a collection device for collection through a purified gas collection pipeline or continues to enter a subsequent purification treatment process for removing other impurities.
Therefore, the working modes of the two-stage desulfurization mixer group and the settling separation tank can be selected according to the flow of the liquefied petroleum gas and the desulfurization requirement, the flexibility of the desulfurization process of the liquefied petroleum gas is greatly improved, the device is not easy to block in the desulfurization process, and the quality of the desulfurized liquefied petroleum gas is ensured.
Preferably, the first-stage desulfurization mixer group and the second-stage desulfurization mixer group respectively comprise three desulfurization mixers which are connected with each other.
Preferably, the three desulfurization mixers include a second desulfurization mixer and a third desulfurization mixer which are connected in parallel, and a first desulfurization mixer which is connected in series with the second desulfurization mixer and the third desulfurization mixer which are connected in parallel.
Preferably, the outlet end of the first desulfurization mixer is respectively connected with the inlet ends of the second desulfurization mixer and the third desulfurization mixer; the inlet of the first-stage and second-stage desulfurization mixer groups is the inlet end of the first desulfurization mixer, and the outlet of the first-stage and second-stage desulfurization mixer groups is the outlet end of the second desulfurization mixer and the outlet end of the third desulfurization mixer.
The method comprises the steps that three desulfurization mixers are respectively arranged in a two-stage desulfurization mixer group, a second desulfurization mixer and a third desulfurization mixer are connected in parallel, and a first desulfurization mixer is connected with the second desulfurization mixer and the third desulfurization mixer which are connected in parallel in series; by adopting the connection mode, the liquefied petroleum gas and the lean amine liquid firstly enter the first desulfurization mixer for preliminary mixed desulfurization, then the mixed liquid after uniform mixing enters the second and third desulfurization mixers for continuous mixed desulfurization, so that the sufficient desulfurization time is ensured, and the system can have higher working efficiency while the desulfurization effect is ensured.
Preferably, the first-stage settling separation tank adopts a horizontal settling separation tank, and the second-stage settling separation tank adopts a vertical settling separation tank. The horizontal settling separation tank has longer retention time, so that the separation effect of the liquefied petroleum gas and the amine liquid can be improved; the vertical settling separation tank has shorter retention time, and can improve the working efficiency of the system.
Preferably, a control valve is arranged on the liquefied petroleum gas conveying pipeline in front of the inlets of the primary desulfurization mixer group and the secondary desulfurization mixer group. The control valves are arranged on the liquefied petroleum gas conveying pipeline in front of the inlets of the first-stage desulfurization mixer group and the second-stage desulfurization mixer group, and the operation mode of the two-stage desulfurization mixer group can be controlled through the opening and closing of the two control valves, so that the desulfurization flow of the system is controlled.
Preferably, the rich amine liquid regeneration pipelines at the rich amine liquid outlets of the primary and secondary sedimentation separation tanks are provided with control valves.
Preferably, a heat exchanger is arranged on the lean amine liquid conveying pipeline, and the heat exchanger is connected with a circulating water pipeline. According to the utility model, the heat exchanger is arranged on the lean amine liquid conveying pipeline, and the lean amine liquid is cooled by circulating water, so that the desulfurization effect of the system is improved.
Preferably, the heat exchanger is provided with a circulating water control valve.
Therefore, the utility model has the following beneficial effects:
(1) the desulfurization mixer is combined with the settling separation tank to remove the hydrogen sulfide, so that the device is not easy to block in the desulfurization process, and the quality of the desulfurized liquefied petroleum gas is ensured;
(2) the two-stage desulfurization mixer group and the settling separation tank are arranged in the system, the two stages can work independently and in series, the working modes of the two-stage desulfurization mixer group and the settling separation tank can be selected according to the flow and desulfurization requirements of the liquefied petroleum gas, and the flexibility of the liquefied petroleum gas desulfurization process is greatly improved.
Drawings
Fig. 1 is a schematic view of a connection structure of the present invention.
In the figure: 1 first-stage desulfurization mixer group, 1-1 first desulfurization mixer, 1-2 second desulfurization mixer, 1-3 third desulfurization mixer, 2 first-stage settling separation tank, liquid inlet of 2-1 first-stage settling separation tank, liquefied petroleum gas outlet of 2-2 first-stage settling separation tank, amine-rich liquid outlet of 2-3 first-stage settling separation tank, 3 second-stage desulfurization mixer group, 4 second-stage settling separation tank, liquid inlet of 4-1 second-stage settling separation tank, liquefied petroleum gas outlet of 4-2 second-stage settling separation tank, amine-rich liquid outlet of 4-3 second-stage settling separation tank, 5 liquefied petroleum gas conveying pipeline, 6 lean amine liquid conveying pipeline, 7 purified gas collecting pipeline, 8 amine-rich liquid regeneration pipeline, 9 control valve, 10 heat exchanger, 11 circulating water lines, 12 circulating water control valves.
Detailed Description
The utility model is further described with reference to the following detailed description and accompanying drawings.
Example (b):
as shown in fig. 1, a system for removing hydrogen sulfide from liquefied petroleum gas includes a primary desulfurization mixer group 1, a primary settling separation tank 2, a secondary desulfurization mixer group 3, and a secondary settling separation tank 4, which are sequentially disposed.
The first-stage desulfurization mixer group and the second-stage desulfurization mixer group respectively comprise three desulfurization mixers which are connected with each other, wherein the three desulfurization mixers comprise a second desulfurization mixer 1-2 and a third desulfurization mixer 1-3 which are connected in parallel and a first desulfurization mixer 1-1 which is connected with the second desulfurization mixer and the third desulfurization mixer which are connected in parallel in series; the outlet end of the first desulfurization mixer is respectively connected with the inlet ends of the second desulfurization mixer and the third desulfurization mixer; the inlet of the first-stage and second-stage desulfurization mixer groups is the inlet end of the first desulfurization mixer, and the outlet of the first-stage and second-stage desulfurization mixer groups is the outlet end of the second desulfurization mixer and the outlet end of the third desulfurization mixer.
The primary sedimentation separating tank and the secondary sedimentation separating tank are respectively provided with a liquid inlet, a liquefied petroleum gas outlet and an amine-rich liquid outlet, the primary sedimentation separating tank adopts a horizontal sedimentation separating tank, and the secondary sedimentation separating tank adopts a vertical sedimentation separating tank. The inlet of the primary desulfurization mixer group is respectively connected with a liquefied petroleum gas conveying pipeline 5 and a lean amine liquid conveying pipeline 6, and the outlet of the primary desulfurization mixer group is connected with a liquid inlet 2-1 of the primary settling separation tank through a pipeline; and a liquefied petroleum gas outlet 2-2 of the primary settling separation tank is respectively connected with an inlet of the secondary desulfurization mixer group and a purified gas collecting pipeline 7, and an amine-rich liquid outlet 2-3 of the primary settling separation tank is connected with an amine-rich liquid regeneration pipeline 8.
The inlet of the secondary desulfurization mixer group is respectively connected with the liquefied petroleum gas outlet of the primary settling separation tank, a liquefied petroleum gas conveying pipeline 5 and an lean amine liquid conveying pipeline 6, and the outlet of the secondary desulfurization mixer group is connected with the liquid inlet 4-1 of the secondary settling separation tank through a pipeline; and a liquefied petroleum gas outlet 4-2 of the secondary sedimentation separation tank is connected with a purified gas collection pipeline 7, and an amine-rich liquid outlet 4-3 of the secondary sedimentation separation tank is connected with an amine-rich liquid regeneration pipeline.
A heat exchanger 10 is arranged on the lean amine liquid conveying pipeline, the heat exchanger is connected with a circulating water pipeline 11, and a circulating water control valve 12 is arranged on the heat exchanger; control valves 9 are respectively arranged on the liquefied petroleum gas conveying pipelines in front of the inlets of the primary and secondary desulfurization mixer groups, and control valves are respectively arranged on the rich amine liquid regeneration pipelines at the rich amine liquid outlets of the primary and secondary settling separation tanks.
When the system operates, the two-stage desulfurization mixer group and the settling separation tank can work independently or in series. The liquefied petroleum gas with hydrogen sulfide content of about 3 percent and large flow (30 t/h) can be desulfurized through two stages of series connection: firstly, respectively conveying the liquefied petroleum gas and the MDEA lean amine liquid cooled by the heat exchanger to a primary desulfurization mixer group through a liquefied petroleum gas conveying pipeline and a lean amine liquid conveying pipeline for mixing, and pre-desulfurizing the liquefied petroleum gas, wherein the hydrogen sulfide content of the liquefied petroleum gas after pre-desulfurization can be reduced to 100-200 ppm; then the mixed liquid enters a primary settling separation tank for separation, the separated rich amine liquid enters a subsequent regeneration process through a rich amine liquid regeneration pipeline for regeneration, the liquefied petroleum gas obtained after pre-desulfurization through separation enters a secondary desulfurization mixer group, and is mixed with lean amine liquid conveyed to the secondary desulfurization mixer group through a lean amine liquid conveying pipeline for further desulfurization, and the content of hydrogen sulfide in the liquefied petroleum gas desulfurized by the secondary desulfurization mixer can be further reduced to be below 10 ppm; and then the mixed liquor enters a secondary sedimentation separation tank for separation, the separated rich amine liquid enters a subsequent regeneration process for regeneration through a rich amine liquid regeneration pipeline, and the desulfurized liquefied petroleum gas obtained by separation enters a collection device for collection through a purified gas collection pipeline or continues to enter a subsequent purification treatment process for removing other impurities. Three desulfurization mixers are respectively arranged in the primary desulfurization mixer group and the secondary desulfurization mixer group, liquefied petroleum gas and lean amine liquid firstly enter the first desulfurization mixer to be primarily mixed and desulfurized during working, then the uniformly mixed liquid enters the second desulfurization mixer and the third desulfurization mixer to be continuously mixed and desulfurized, and sufficient desulfurization time is ensured, so that the desulfurization effect is ensured, and meanwhile, the system has higher working efficiency.
The small flow (less than 10 t/h) liquefied petroleum gas can be desulfurized independently by a first-stage desulfurization mixer group and a first-stage settling separation tank, and the content of hydrogen sulfide in the desulfurized liquefied petroleum gas is below 10 ppm.
The utility model can select the working modes of the two-stage desulfurization mixer group and the settling separation tank according to the flow of the liquefied petroleum gas and the desulfurization requirement, greatly improves the flexibility of the desulfurization process of the liquefied petroleum gas, ensures that the device is not easy to block in the desulfurization process, and ensures the quality of the desulfurized liquefied petroleum gas.
Claims (9)
1. A system for removing hydrogen sulfide from liquefied petroleum gas is characterized by comprising a primary desulfurization mixer group (1), a primary settling separation tank (2), a secondary desulfurization mixer group (3) and a secondary settling separation tank (4) which are sequentially arranged; a liquid inlet, a liquefied petroleum gas outlet and an amine-rich liquid outlet are respectively arranged on the primary sedimentation separating tank and the secondary sedimentation separating tank; the inlet of the primary desulfurization mixer group is respectively connected with a liquefied petroleum gas conveying pipeline (5) and a lean amine liquid conveying pipeline (6), and the outlet of the primary desulfurization mixer group is connected with a liquid inlet (2-1) of the primary settling separation tank through a pipeline; a liquefied petroleum gas outlet (2-2) of the primary settling separation tank is respectively connected with an inlet of the secondary desulfurization mixer group and a purified gas collecting pipeline (7), and an amine-rich liquid outlet (2-3) of the primary settling separation tank is connected with an amine-rich liquid regeneration pipeline (8); the inlet of the secondary desulfurization mixer group is respectively connected with the liquefied petroleum gas outlet of the primary settling separation tank, a liquefied petroleum gas conveying pipeline and an amine-poor liquid conveying pipeline, and the outlet of the secondary desulfurization mixer group is connected with the liquid inlet (4-1) of the secondary settling separation tank through a pipeline; and a liquefied petroleum gas outlet (4-2) of the secondary sedimentation separation tank is connected with a purified gas collection pipeline, and an amine-rich liquid outlet (4-3) of the secondary sedimentation separation tank is connected with an amine-rich liquid regeneration pipeline.
2. The system of claim 1, wherein the first and second desulfurization mixer sets each include three desulfurization mixers connected to each other.
3. The system for removing hydrogen sulfide from liquefied petroleum gas as claimed in claim 2, wherein said three desulfurization mixers include a second desulfurization mixer (1-2) and a third desulfurization mixer (1-3) connected in parallel and a first desulfurization mixer (1-1) connected in series with the second and third desulfurization mixers connected in parallel.
4. The system for removing hydrogen sulfide from liquefied petroleum gas as claimed in claim 3, wherein the outlet end of said first desulfurization mixer is connected to the inlet ends of the second and third desulfurization mixers, respectively; the inlet of the first-stage and second-stage desulfurization mixer groups is the inlet end of the first desulfurization mixer, and the outlet of the first-stage and second-stage desulfurization mixer groups is the outlet end of the second desulfurization mixer and the outlet end of the third desulfurization mixer.
5. The system for removing hydrogen sulfide from liquefied petroleum gas as claimed in claim 1, wherein the primary settling separation tank is a horizontal settling separation tank, and the secondary settling separation tank is a vertical settling separation tank.
6. The system for removing hydrogen sulfide from liquefied petroleum gas as claimed in claim 1, wherein a control valve (9) is provided on the liquefied petroleum gas delivery line before the inlets of said primary and secondary desulfurization mixer groups.
7. The system for removing hydrogen sulfide from liquefied petroleum gas as claimed in claim 1 or 6, wherein a control valve is provided on the rich amine liquid regeneration line at the rich amine liquid outlet of said primary and secondary settling separation tanks.
8. The system for removing hydrogen sulfide from liquefied petroleum gas as claimed in claim 1, wherein said lean amine liquid transfer line is provided with a heat exchanger (10), and said heat exchanger is connected to a circulating water line (11).
9. The system for removing hydrogen sulfide from liquefied petroleum gas as claimed in claim 8, wherein said heat exchanger is provided with a circulating water control valve (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121201533.8U CN215517291U (en) | 2021-05-31 | 2021-05-31 | System for removing hydrogen sulfide from liquefied petroleum gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121201533.8U CN215517291U (en) | 2021-05-31 | 2021-05-31 | System for removing hydrogen sulfide from liquefied petroleum gas |
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