CN216755435U - Energy-saving transformation system for extraction regeneration tower - Google Patents
Energy-saving transformation system for extraction regeneration tower Download PDFInfo
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- CN216755435U CN216755435U CN202123309541.7U CN202123309541U CN216755435U CN 216755435 U CN216755435 U CN 216755435U CN 202123309541 U CN202123309541 U CN 202123309541U CN 216755435 U CN216755435 U CN 216755435U
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Abstract
The utility model relates to an energy-saving reconstruction system of an extraction regeneration tower, which comprises: one side of the extraction distillation tower is connected with a steam reboiler through a pipeline, the top end of the other side of the steam reboiler is connected through a steam pipeline, the bottom of the steam reboiler is connected to the top of a steam condensation water tank through a pipeline, the bottom of the steam condensation water tank is connected to a condensation water pipe network through an outlet pipeline, and an adjusting valve group is arranged on the outlet pipeline; a pilot shower valve is arranged at the low point of the regulating valve group, and the lower part of the pilot shower valve is connected with a hot water pipeline; a tower bottom solvent heat exchanger is arranged on the side wall of the lower part of the extraction distillation tower opposite to the steam reboiler, a solvent pipeline is arranged between the tower bottom solvent heat exchanger and the bottom of the recovery tower, and a solvent regeneration pipeline is arranged on the solvent pipeline; the hot water pipeline and the solvent regeneration pipeline are gathered and connected to the regeneration solvent tower; high-temperature high-pressure hot water is introduced into a regenerated solvent tower, the hot water is mixed with a regenerated solvent, and the aim of solvent regeneration is fulfilled by flash evaporation vaporization after the hot water enters a system.
Description
Technical Field
The utility model relates to an energy-saving reconstruction system of an extraction regeneration tower, and relates to the field of chemical engineering.
Background
The water separated from reflux tank of recovery tower is used as stripping medium, and then fed together with water from reflux tank of non-aromatic distillation tower into lean solvent/water heat exchanger under the condition of flow control to make heat exchange with lean solvent and make complete vaporization, then fed into bottom of solvent regeneration tower to make stripping regeneration of solvent. The lean solvent in the extraction tower is pumped out by a lean solvent pump to increase the pressure, most of the lean solvent is circulated to the extraction distillation tower after combined heat exchange, and a small part of the lean solvent is sent to the solvent regeneration tower to be subjected to reduced pressure distillation regeneration.
The solvent regeneration column operates under vacuum, essentially a vacuum evaporator, the top of which is connected to a recovery column. The tower bottom is provided with a reboiler. The small stream of lean solvent from the lean solvent pump enters a solvent regeneration tower for stripping to remove high molecular polymer and other mechanical impurities, and the gas phase distilled from the tower top directly enters the bottom of a recovery tower. And discharging the residue at the bottom of the solvent regeneration tower at irregular intervals. Meanwhile, the hydrocarbon content in the solvent can be reduced by a certain steam stripping steam-water ratio of the stripping steam to the circulating solvent, the adsorption capacity of the solvent is improved, and the amount of the circulating solvent is reduced under the same feeding condition, so that the aim of saving energy is fulfilled.
Because the stripping steam for stripping regeneration of the solvent regeneration tower comes from the cooling water separated from the reflux tank and still needs to continuously absorb heat and raise the temperature in the regeneration tower after the initial temperature rise of the lean solvent/water heat exchanger, if the problem that the steam can be kept stable and does not need to be continuously raised when the stripping water ratio is increased compared with the heating steam of the regeneration tower is solved, the aim of saving energy can be effectively achieved.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model aims to provide an energy-saving reforming system of an extraction regeneration tower, which reduces the heating steam of the solvent regeneration tower by introducing high-temperature stripping water to replace part of low-temperature stripping water, finally reduces the heating steam amount of the regeneration tower, and simultaneously reduces the hydrocarbon content in the circulating solvent by increased stripping steam.
In order to achieve the purpose, the utility model adopts the technical scheme that: an energy-saving reforming system of an extraction regeneration tower comprises: an extraction distillation tower, a steam reboiler, a steam condensate tank, a recovery tower, a regeneration solvent tower and a hot water pipeline; one side of the extraction distillation tower is connected with a steam reboiler through a pipeline, the pipeline is connected with one side of the steam reboiler, the top end of the other side of the steam reboiler is connected through a steam pipeline, the bottom of the steam reboiler is connected with the top of a steam condensation water tank through a pipeline, the bottom of the steam condensation water tank is connected to a condensation water pipe network through an outlet pipeline, and an adjusting valve group is arranged on the outlet pipeline; a pilot shower valve is arranged at the low point of the regulating valve group, and the lower part of the pilot shower valve is connected with one end of a hot water pipeline; a tower bottom solvent heat exchanger is arranged on the side wall of the lower part of the extraction distillation tower opposite to the steam reboiler, a solvent pipeline is arranged between the tower bottom solvent heat exchanger and the bottom of the recovery tower, and a solvent regeneration pipeline is connected to the solvent pipeline; the hot water pipeline and the solvent regeneration pipeline are gathered and connected into the regeneration solvent tower;
further, a steam pipeline connected with the top end of the other side of the steam reboiler is a 2.2MPa steam pipeline;
furthermore, the regulating valve group comprises a manual regulating valve and an electromagnetic regulating valve;
further, the upper end of the other side of the extractive distillation tower is connected with a feed line and a solvent circulation pipeline, one end of the feed line is connected into the extractive distillation tower, the other end of the feed line is connected with an extractive feed heat exchanger, and the solvent circulation pipeline is connected to the extractive feed heat exchanger and connected into the extractive distillation tower;
furthermore, a gate valve is arranged on the hot water pipeline close to the feed inlet of the regeneration solvent tower;
furthermore, the top of the regenerated solvent tower is connected to the bottom of the recovery tower through a pipeline, the top of the recovery tower is connected to a recovery tower air cooler through a pipeline, the outlet end of the recovery tower air cooler is connected to a recovery tower reflux tank, and the bottom of the reflux tank is connected back to the recovery tower through a recovery tower reflux pump;
furthermore, the bottom of the return tank of the recovery tower is connected with a condensed water circulating pump through a pipeline, the condensed water circulating pump is connected to external condensed water through a pipeline, and an external condensed water valve is arranged on the pipeline.
Furthermore, the condensed water circulating pump is also connected to a stripping water heat exchanger through a pipeline, and the stripping water heat exchanger is connected to the regenerated solvent tower through a pipeline.
Furthermore, a foam breaking net is arranged at the tower top of the regeneration solvent tower and used for intercepting colloidal substances in the solvent.
In the structure, a hot water pipeline is led out from a low point spray guiding position of a regulating valve of an outlet pipeline of a condensate tank connected with a steam reboiler of the extractive distillation tower, the hot water is connected to a regenerated solvent pipeline of a solvent regeneration tower, and is mixed with the solvent and then enters the regenerated solvent tower, because the temperature and pressure of the hot water are higher than the internal state of the tower, the hot water is vaporized by flash evaporation after entering the tower, part of the regenerated solvent is carried into a foam breaking net at the top of the tower in the vaporization process, the colloidal substances in the solvent are intercepted, and the rest of the regenerated solvent falls into the bottom of the tower and is flashed by original stripping steam at the bottom of the tower again; after hot water is introduced into the system, the stripping water is gradually reduced according to the balance of the system, the water drum boundary position of the recovery tower is increased, the water is discharged out of the system to the outside through a water discharge pipeline at the top of the tower in a small flow, the PH value of the discharged water and the PH value of the supplemented hot water are monitored in the water discharging process, if the PH value of the discharged water exceeds the PH value of the supplemented hot water, the supplementary amount of the hot water is reduced, and the PH value balance in the system is ensured.
The principle of the utility model is as follows:
the aim of solvent regeneration is achieved by introducing high-temperature high-pressure hot water into a regeneration solvent tower, mixing the hot water with a regeneration solvent and utilizing flash evaporation vaporization of the hot water after entering a system.
The utility model has the beneficial effects that:
the newly introduced high-temperature hot water is directly vaporized in a flash evaporation mode in the system by replacing a low-temperature steam stripping mode with a newly added hot water pipeline and operation change, so that the regenerated solvent is well flashed, heating steam at the bottom of the regeneration tower is saved, and the effect of saving energy is achieved. Because newly introduced hot water does not need heat absorption flash evaporation, heating steam at the bottom of the regenerated solvent tower can be saved; meanwhile, the newly added stripping steam can effectively reduce the content of the residual hydrocarbon in the solvent, thereby achieving the purpose of saving the circulating solvent.
Drawings
FIG. 1 is a block diagram of the present invention.
In the figure, 1, an extractive distillation tower, 2, a steam reboiler, 3, a steam condensate tank, 4, a regulating valve group, 5, a condensate regulating valve group pilot valve, 6, a gate valve, 7, a regenerated solvent tower, 8, a stripping water heat exchanger, 9, a recovery tower, 10, a recovery tower air cooler, 11, a recovery tower reflux tank, 12, a recovery tower reflux pump, 13, a condensed water circulating pump, 14, an external condensate valve, 15, an extraction feed heat exchanger, 16, an extractive distillation tower bottom solvent heat exchanger, 17, a hot water pipeline, 18, a solvent regeneration pipeline, 19, a feed line, 20 and a solvent circulation pipeline.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model.
An energy-saving reconstruction system of an extraction regeneration tower shown in fig. 1 comprises: an extraction distillation tower 1, a steam reboiler 2, a steam condensate tank 3, a recovery tower 9, a regeneration solvent tower 7 and a hot water pipeline 17; one side of the extractive distillation tower 1 is connected with a steam reboiler 2 through a pipeline and is connected with one side of the steam reboiler 2 through a pipeline, the top end of the other side of the steam reboiler 2 is connected through a steam pipeline, the bottom of the steam reboiler 2 is connected with the top of a steam condensate tank 3 through a pipeline, the bottom of the steam condensate tank 3 is connected to a condensate pipe network through an outlet pipeline, and an adjusting valve group 4 is arranged on the outlet pipeline; a pilot shower valve 5 is arranged at the low point of the regulating valve group 4, and the lower part of the pilot shower valve 5 is connected with one end of a hot water pipeline 17; a tower bottom solvent heat exchanger 16 is arranged on the side wall of the lower part of the extraction distillation tower 1 opposite to the steam reboiler 2, a solvent pipeline is arranged between the tower bottom solvent heat exchanger 16 and the bottom of the recovery tower 9, and a solvent regeneration pipeline 18 is connected to the solvent pipeline; a hot water line 17 and a solvent regeneration line 18 are gathered and connected into the regeneration solvent tower 7;
further, the upper end of the other side of the extractive distillation tower 1 is connected with a feed line 19 and a solvent circulation line 20, the end part of one end of the feed line 19 is connected into the extractive distillation tower 1, the other end of the feed line 19 is connected with the extractive feed heat exchanger 15, and the solvent circulation line 20 is connected to the extractive feed heat exchanger 15 and connected into the extractive distillation tower 1;
further, a gate valve 6 is arranged on the hot water pipeline 17 close to the feed inlet of the regenerated solvent tower 7;
further, the top of the regenerated solvent tower 7 is connected to the bottom of the recovery tower 9 through a pipeline, the top of the recovery tower 9 is connected to a recovery tower air cooler 10 through a pipeline, the outlet end of the recovery tower air cooler 10 is connected to a recovery tower reflux tank 11, and the bottom of the reflux tank 11 is connected back to the recovery tower 9 through a recovery tower reflux pump 12;
further, the bottom of the recovery tower reflux tank 11 is connected with a condensed water circulating pump 13 through a pipeline, the condensed water circulating pump 13 is connected to external condensed water through a pipeline, and an external condensed water valve 14 is arranged on the pipeline.
Further, the condensed water circulating pump 13 is connected to the stripping water heat exchanger 8 through a pipeline, and the stripping water heat exchanger 8 is connected to the regenerated solvent tower 7 through a pipeline.
And a foam breaking net is arranged at the top of the regeneration solvent tower 7 and used for intercepting colloidal substances in the solvent.
In the structure, a hot water pipeline 17 is led out from the low point spray guiding position of an outlet pipeline regulating valve group 4 of a condensate tank 3 connected with a steam reboiler 2 of an extractive distillation tower 1, the hot water is connected to a solvent regeneration pipeline 18 of a solvent regeneration tower 7, and enters the regeneration solvent tower 7 after being mixed by a solvent and hot water, and is subjected to flash evaporation after entering the tower due to the fact that the temperature and pressure of the hot water are higher than those in the tower, part of the regeneration solvent is carried in the evaporation process and enters a foam breaking net at the top of the tower to intercept colloidal substances in the solvent, and the rest of the regeneration solvent falls into the bottom of the tower and is subjected to flash evaporation again by original stripping steam at the bottom of the tower; after hot water is introduced into the system, the stripping water is gradually reduced according to the balance of the system, the water drum boundary level of the recovery tower 9 is increased, the stripping water is discharged out of the system to the outside through a water discharge pipeline on the top of the tower at a small flow rate, the PH value of the discharged water and the PH value of the supplementary hot water are monitored in the water re-discharging process, if the PH value of the discharged water exceeds the PH value of the supplementary hot water, the supplementary amount of the hot water is reduced, and the PH value balance in the system is ensured.
After the solvent regeneration process is carried out, high-temperature and high-pressure hot water is introduced into the regenerated solvent tower 7, the hot water and the regenerated solvent are mixed, the purpose of solvent regeneration is achieved by flash evaporation vaporization after the hot water enters a system, meanwhile, heating steam at the bottom of the regenerated solvent tower 7 is reduced, meanwhile, hydrocarbon content in the solvent at the bottom of the recovery tower 9 is reduced by increased stripping steam, and therefore, the solvent circulation amount is reduced, and the purpose of energy conservation is achieved.
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 (8)
1. An energy-saving transformation system for an extraction regeneration tower is characterized by comprising: an extraction distillation tower, a steam reboiler, a steam condensate tank, a recovery tower, a regeneration solvent tower and a hot water pipeline; one side of the extraction distillation tower is connected with a steam reboiler through a pipeline, the pipeline is connected with one side of the steam reboiler, the top end of the other side of the steam reboiler is connected through a steam pipeline, the bottom of the steam reboiler is connected with the top of a steam condensation water tank through a pipeline, the bottom of the steam condensation water tank is connected to a condensation water pipe network through an outlet pipeline, and an adjusting valve group is arranged on the outlet pipeline; a pilot shower valve is arranged at the low point of the regulating valve group, and the lower part of the pilot shower valve is connected with one end of a hot water pipeline; a tower bottom solvent heat exchanger is arranged on the side wall of the lower part of the extraction distillation tower opposite to the steam reboiler, a solvent pipeline is arranged between the tower bottom solvent heat exchanger and the bottom of the recovery tower, and a solvent regeneration pipeline is connected to the solvent pipeline; the hot water line and the solvent regeneration line are gathered and connected to the regeneration solvent tower.
2. The energy-saving reconstruction system for the extraction regeneration tower as claimed in claim 1, wherein: the steam pipeline connected with the top end of the other side of the steam reboiler is a 2.2MPa steam pipeline.
3. The energy-saving reconstruction system for the extraction regeneration tower as claimed in claim 1, wherein: the upper end of the other side of the extraction distillation tower is connected with a feed line and a solvent circulation line, one end of the feed line is connected into the extraction distillation tower, the other end of the feed line is connected with an extraction feed heat exchanger, and the solvent circulation line is connected to the extraction feed heat exchanger and connected into the extraction distillation tower.
4. The energy-saving reconstruction system for the extraction regeneration tower as claimed in claim 1, wherein: and a gate valve is arranged on the hot water pipeline close to the feed inlet of the regeneration solvent tower.
5. The energy-saving reconstruction system for the extraction regeneration tower as claimed in any one of claims 1 to 4, wherein: the top of the regeneration solvent tower is connected to the bottom of the recovery tower through a pipeline, the top of the recovery tower is connected with a recovery tower air cooler through a pipeline, the outlet end of the recovery tower air cooler is connected to a recovery tower reflux tank, and the bottom of the reflux tank is connected back to the recovery tower through a recovery tower reflux pump.
6. The energy-saving reconstruction system for the extraction regeneration tower as claimed in claim 5, wherein: the bottom of the return tank of the recovery tower is also connected with a condensed water circulating pump through a pipeline, the condensed water circulating pump is connected to external condensed water through a pipeline, and an external condensed water valve is arranged on the pipeline.
7. The energy-saving reconstruction system for the extraction regeneration tower as claimed in claim 6, wherein: the condensed water circulating pump is also connected to a stripping water heat exchanger through a pipeline, and the stripping water heat exchanger is connected to the regenerated solvent tower through a pipeline.
8. The energy-saving reconstruction system for the extraction regeneration tower as claimed in claim 5, wherein: and a foam breaking net is arranged at the top of the regeneration solvent tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123309541.7U CN216755435U (en) | 2021-12-27 | 2021-12-27 | Energy-saving transformation system for extraction regeneration tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123309541.7U CN216755435U (en) | 2021-12-27 | 2021-12-27 | Energy-saving transformation system for extraction regeneration tower |
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| Publication Number | Publication Date |
|---|---|
| CN216755435U true CN216755435U (en) | 2022-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123309541.7U Active CN216755435U (en) | 2021-12-27 | 2021-12-27 | Energy-saving transformation system for extraction regeneration tower |
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| Country | Link |
|---|---|
| CN (1) | CN216755435U (en) |
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2021
- 2021-12-27 CN CN202123309541.7U patent/CN216755435U/en active Active
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