CN-122010218-A - Sewage steam stripping and solvent regeneration heat self-circulation system

Abstract

The application provides a sewage stripping and solvent regeneration heat self-circulation system which comprises a sewage stripping tower, a sewage stripping reboiler, a solvent regeneration tower, a solvent reboiler, a first steam stripping outlet, a second steam stripping steam outlet, a first steam generator and/or a second steam generator, wherein a purified water inlet of the sewage stripping reboiler is connected with a purified water outlet of the sewage stripping tower, a first steam outlet of the sewage stripping reboiler is connected with a first gas outlet of the sewage stripping tower, a solvent regeneration tower, a lean amine liquid inlet of the solvent reboiler is connected with a lean amine liquid outlet of the solvent regeneration tower, a second steam outlet of the solvent reboiler is connected with a second gas outlet of the solvent regeneration tower, a hot side inlet of the first steam generator and/or the second steam generator is connected with a purified water outlet/lean amine liquid outlet, a cold side inlet of the first steam generator is connected with a condensed water outlet, and a gas phase inlet of the steam compression unit is connected with a first gas outlet of the first steam generator and/or a second gas outlet of the second steam generator. The application can deeply recycle the waste heat of the materials in the tower and the waste heat of the condensation water of the reboiler, and reduce the steam consumption of the system.

Inventors

• YU JINSEN
• LIU JISHUN
• LI BO
• Du Yuetan
• MU JIE

Assignees

• 上海优华系统集成技术股份有限公司
• 广州优华过程技术有限公司

Dates

Publication Date

20260512

Application Date

20260408

Claims (10)

1. 1. A wastewater stripping and solvent regeneration thermal self-circulation system, comprising: a wastewater stripper configured to receive sour water, remove acid components by stripping steam, and output purified water and sour gas; The sewage stripping reboiler is provided with a first steam inlet, a purified water inlet, a first stripping steam outlet and a first condensed water outlet, wherein the purified water inlet is connected with the purified water outlet of the sewage stripping tower, and the first stripping steam outlet is connected with a first gas phase return port of the sewage stripping tower; a solvent regeneration column configured to receive the rich amine liquid, regenerate by stripping steam, and output a lean amine liquid and an acid gas; a solvent reboiler having a second steam inlet, a lean amine liquid inlet, a second stripping steam outlet and a second condensate outlet, the lean amine liquid inlet being connected to the lean amine liquid outlet of the solvent regenerator, the second stripping steam outlet being connected to the second vapor phase return port of the solvent regenerator; The first hot side inlet of the first steam generator is connected with the purified water outlet, the first cold side inlet of the first steam generator is connected with the first condensate outlet, the second hot side inlet of the second steam generator is connected with the lean amine liquid outlet, and the second cold side inlet of the second steam generator is connected with the second condensate outlet; the gas phase inlet of the vapor compression unit is connected with the first gas outlet of the first vapor generator and/or the second gas outlet of the second vapor generator, and the gas phase outlet of the vapor compression unit is connected with the first vapor inlet and the second vapor inlet.
2. 2. The system of claim 1, further comprising a first condensate pump and/or a second condensate pump, wherein: The first condensate pump is connected between a first cold side outlet of the first steam generator and a liquid phase inlet of the steam compression unit, and the second condensate pump is connected between a second cold side outlet of the second steam generator and a liquid phase inlet of the steam compression unit; And the outlet of the first condensate pump and/or the second condensate pump is also connected with an external outlet of the condensate.
3. 3. The system of claim 2, wherein the system further comprises: A first liquid level regulating valve connected in the pipeline from the first cold side outlet to the first condensate pump and/or A second liquid level regulating valve connected in the pipeline from the second cold side outlet to the second condensate pump and/or And the temperature-reducing water regulating valve is connected in a pipeline from the outlet of the first condensate pump and/or the second condensate pump to the liquid phase inlet.
4. 4. The system of claim 1, wherein the system further comprises: The first material inlet and outlet heat exchanger is provided with a first heat exchange pipeline and a second heat exchange pipeline, the first heat exchange pipeline is thermally coupled with the second heat exchange pipeline, the first heat exchange pipeline is connected between a first hot side outlet of the first steam generator and a purified water outlet, and the second heat exchange pipeline is connected between an acid water inlet and an acid water inlet of the sewage stripping tower; The second feeding and discharging heat exchanger is provided with a third heat exchange pipeline and a fourth heat exchange pipeline, the third heat exchange pipeline is in thermal coupling with the fourth heat exchange pipeline, the third heat exchange pipeline is connected between a second hot side outlet of the second steam generator and an outlet of the lean amine liquid, and the fourth heat exchange pipeline is connected between an outlet of the rich amine liquid and an inlet of the rich amine liquid of the solvent regeneration tower.
5. 5. The system of claim 4, wherein the system further comprises: a first feedstock preheating heat exchanger having a fifth heat exchange line thermally coupled to the sixth heat exchange line, the fifth heat exchange line being connected between the second heat exchange line and the sour water inlet, the sixth heat exchange line being connected between the first sour gas outlet and the first sour gas outlet of the dirty water stripper; The first reflux tank is connected with the sixth heat exchange pipeline, the first reflux pump is connected with a first reflux inlet of the sewage stripping tower, and the first reflux tank is also connected with a first acid gas external outlet.
6. 6. The system of claim 5, wherein the system further comprises: a first cooling device connected between the first heat exchange pipeline and the purified water outlet, and/or And the second cooling device is connected between the sixth heat exchange pipeline and the first reflux tank.
7. 7. The system of claim 4, wherein the system further comprises: a second feedstock preheating heat exchanger having a seventh heat exchange line thermally coupled to the eighth heat exchange line, the seventh heat exchange line being connected between the fourth heat exchange line and the rich amine liquid inlet, and an eighth heat exchange line being connected between a second acid gas outlet and a second acid gas outlet of the solvent regeneration tower; And the second reflux tank is connected with the eighth heat exchange pipeline, the second reflux pump is connected with a second reflux inlet of the solvent regeneration tower, and the second reflux tank is also connected with a second acid gas external outlet.
8. 8. The system of claim 7, wherein the system further comprises: a third cooling device connected between the third heat exchange pipeline and the lean amine liquid outlet and/or And the fourth cooling device is connected between the eighth heat exchange pipeline and the second reflux tank.
9. 9. The system of claim 1, wherein the system further comprises: A first condensate control valve connected in the pipeline from the first condensate outlet to the first cold side inlet, and/or A second condensate control valve connected in the pipeline from the second condensate outlet to the second cold side inlet, and/or A first flow regulating valve connected in the pipeline between the steam inlet and the steam outlet, and/or A second flow regulating valve connected in the pipeline between the steam external inlet and the second steam inlet, and/or A third flow regulating valve connected in the pipeline of the gas phase outlet and the first steam inlet, and/or And the fourth flow regulating valve is connected in a pipeline of the gas phase outlet and the second steam inlet.
10. 10. The system of claim 1 or 5, wherein the first sour gas outlet is located at the top of the dirty water stripper, the purified water outlet is located at the bottom of the dirty water stripper, the top operating temperature of the dirty water stripper is in the range of 105 ℃ to 125 ℃, the top operating pressure of the dirty water stripper is in the range of 0.1MPag to 0.2MPag, the bottom operating temperature of the dirty water stripper is in the range of 120 ℃ to 135 ℃, the bottom operating pressure of the dirty water stripper is in the range of 0.12MPag to 0.25MPag, and/or The second acid gas outlet is positioned at the top of the solvent regeneration tower, the lean amine liquid outlet is positioned at the bottom of the solvent regeneration tower, the top operating temperature of the solvent regeneration tower is positioned in the range of 95-110 ℃, the top operating pressure of the solvent regeneration tower is positioned in the range of 0.05-0.15 MPag, the bottom operating temperature of the solvent regeneration tower is positioned in the range of 115-130 ℃, the bottom operating pressure of the solvent regeneration tower is positioned in the range of 0.07-0.2 MPag, and/or The condensate temperature at the output of the dirty water stripping reboiler and the solvent reboiler is in the range of 130 ℃ to 150 ℃, and/or The steam generation temperature of the first steam generator and/or the second steam generator is in the range of 90 ℃ to 105 ℃.

Description

Sewage steam stripping and solvent regeneration heat self-circulation system Technical Field The application relates to the technical field of energy conservation and environmental protection, in particular to a sewage stripping and solvent regeneration heat self-circulation system. Background In petroleum refining and coal chemical production processes, a large amount of acidic water and rich amine liquid containing acidic components such as H 2 S (hydrogen sulfide), NH 3 (ammonia), CO 2 (carbon dioxide) and the like are generated. The sewage stripping device and the solvent regenerating device are core equipment for treating acidic water and rich amine liquid. The existing technology generally adopts reboiler input high-quality steam as a heat source, and stripping steam is generated by heating liquid in a tower and is transmitted to a sewage stripping device and a solvent regeneration device so as to realize the removal of acidic components. In the prior art, high-temperature condensed water discharged by a reboiler is directly cooled by flash evaporation and air cooling, heat is not deeply recycled, and meanwhile, high-temperature materials (purified water or lean amine liquid) in the tower still carry a large amount of waste heat after exchanging heat with raw materials, and cannot be fully recycled, so that the energy consumption of the prior art is high. Therefore, how to deeply recycle the waste heat of the materials in the tower and the waste heat of the condensed water of the reboiler and reduce the steam consumption becomes a technical problem to be solved in the field. It is noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art. Disclosure of Invention The application provides a sewage stripping and solvent regeneration heat self-circulation system which can deeply recover waste heat of materials in a tower and waste heat of condensation water of a reboiler and reduce steam consumption of the system. According to one aspect of the application, a wastewater stripping and solvent regeneration heat self-circulation system is provided, comprising a wastewater stripping tower, a wastewater stripping reboiler, a solvent regeneration tower, a solvent regeneration unit, a compression unit and a compression unit, wherein the wastewater stripping tower is configured to receive acidic water, remove acidic components through stripping steam and output purified water and acidic gas, the wastewater stripping reboiler is provided with a first steam inlet, a purified water inlet, a first stripping steam outlet and a first condensation water outlet, the purified water inlet is connected with the purified water outlet of the wastewater stripping tower, the first stripping steam outlet is connected with a first gas phase return port of the wastewater stripping tower, the solvent regeneration tower is configured to receive rich amine liquid, perform regeneration through stripping steam and output lean amine liquid and acidic gas, the solvent reboiler is provided with a second steam inlet, a lean amine liquid inlet, a second stripping steam outlet and a second condensation water outlet, the lean amine liquid inlet is connected with the lean amine liquid outlet of the solvent regeneration tower, the second stripping steam outlet is connected with a second gas phase return port of the solvent regeneration tower, a first steam generator and/or a second steam generator, wherein the first steam generator is connected with the first steam inlet and the first steam generator, the first steam generator is connected with the first steam inlet and the second steam generator, the first steam generator is connected with the first steam generator steam inlet and the second steam generator steam inlet and the first steam generator steam inlet and the second steam generator steam. In some embodiments, the wastewater stripping and solvent regeneration thermal self-circulation system further comprises a first condensate pump and/or a second condensate pump, wherein the first condensate pump is connected between a first cold side outlet of the first steam generator and a liquid phase inlet of the vapor compression unit, the second condensate pump is connected between a second cold side outlet of the second steam generator and a liquid phase inlet of the vapor compression unit, and an outlet of the first condensate pump and/or the second condensate pump is further connected to a condensate external outlet. In some embodiments, the wastewater stripping and solvent regeneration thermal self-circulation system further comprises a first liquid level regulating valve connected in a pipeline from a first cold side outlet to a first condensate pump, and/or a second liquid level regulating valve connected in a pipeline from a s