CN210845338U - Reflux system at top of distillation tower - Google Patents
Reflux system at top of distillation tower Download PDFInfo
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- CN210845338U CN210845338U CN201921431143.2U CN201921431143U CN210845338U CN 210845338 U CN210845338 U CN 210845338U CN 201921431143 U CN201921431143 U CN 201921431143U CN 210845338 U CN210845338 U CN 210845338U
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Abstract
The utility model relates to a reflux system at the top of a distillation tower, which comprises a distillation tower, a reflux pump and an air cooler; the top of the distillation tower is provided with a first temperature display and control device, the upper part of the distillation tower is sequentially provided with a spraying device, a tower plate and a tower breaking plate from top to bottom, one side of the tower body above a liquid drainage channel of the tower breaking plate is provided with a condensate liquid extraction port, the tower body is connected with a spraying liquid pipeline through a condensate liquid pipeline outside the distillation tower, and a reflux pump and an air cooler are sequentially arranged on the condensate liquid pipeline along the flowing direction of the condensate liquid; a reflux inlet is arranged on the tower body below the tower breaking disc, the reflux inlet is connected with a condensate pipeline at the downstream of the reflux pump through a reflux pipeline outside the distillation tower, and the condensate pipeline at the downstream of the air cooler is additionally connected with a product extraction pipeline at the top of the tower. The utility model discloses can enough avoid the internal reflux mode because of the too big problem that is unfavorable for the support of circulation water pipe diameter, again can the accurate control top of the tower backward flow volume, the large-scale distillation's of specially adapted process system.
Description
Technical Field
The utility model relates to a distillation purification technical field in tar processing, benzene hydrogenation technology especially relates to a reflux system at distillation tower top.
Background
At present, the small-scale distillation process flow adopts an external reflux mode, namely, a gas-phase material evaporated from the top of a distillation tower enters a reflux tank after being cooled in a condensation cooler, the gas-phase material is pumped out by a reflux pump, one part of the material returns to the top of the tower as reflux, and the other part of the material is extracted. Controlling the reflux amount according to the temperature at the top of the tower, and controlling the extraction amount according to the liquid level of the reflux tank.
Along with the increase of the distillation scale, the pipe diameter of a gas phase outlet pipeline at the top of the distillation tower is increased, and the expansion amount of the gas phase pipeline is increased due to higher temperature at the top of the distillation tower if the pipe diameter of the gas phase pipeline is too large, so that the stress analysis and the structural design at the supporting position are not facilitated; for the construction, the installation is not facilitated, and the construction cost is high.
Therefore, the existing large-scale distillation process basically adopts a control mode of internal reflux, namely, a tower top condenser is directly arranged at the top of a distillation tower, and gas-phase materials at the tower top are condensed and then automatically flow back into the distillation tower.
Disclosure of Invention
The utility model provides a reflux system at distillation tower top can enough avoid the internal reflux mode because of the too big problem that is unfavorable for supporting of circulating water pipe diameter, again can the accurate control top of the tower backward flow volume, the large-scale distillation's of specially adapted process systems.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a reflux system at the top of a distillation tower comprises the distillation tower, wherein a non-condensable gas outlet is arranged at the top of the distillation tower, a raw material inlet is arranged at the middle part of the distillation tower, a tower bottom reboiler and a tower bottom product extraction outlet are arranged at the bottom of the distillation tower, the tower bottom product extraction outlet is connected with a tower bottom product pipeline, and a tower bottom product extraction pump is arranged on the tower bottom product pipeline; the device also comprises a reflux pump and an air cooler; the top of the distillation tower is provided with a first temperature display and control device, the upper part of the distillation tower is sequentially provided with a spraying device, a tower plate and a tower breaking plate from top to bottom, the spraying device is connected with a spraying liquid pipeline outside the distillation tower, a regulating valve is arranged on the spraying liquid pipeline close to the distillation tower, and the regulating valve and the first temperature display and control device are controlled in an interlocking manner; a condensate extraction outlet is arranged on one side of the tower body above the tower breaking disc liquid drainage channel, the condensate extraction outlet is connected with a spraying liquid pipeline through a condensate pipeline outside the distillation tower, and a reflux pump and an air cooler are sequentially arranged on the condensate pipeline along the flowing direction of the condensate; a reflux liquid inlet and a temperature display and control device II are arranged on the tower body below the tower breaking disc, the reflux liquid inlet is connected with a condensate liquid pipeline at the downstream of the reflux pump through a reflux liquid pipeline outside the distillation tower, a flow regulating valve and a flow display and control device I are arranged on the reflux liquid pipeline, and the flow display and control device I, the temperature display and control device II and the flow regulating valve are controlled in an interlocking manner; and a second flow display and control device is arranged on the condensate pipeline at the downstream of the reflux pump, the condensate pipeline at the downstream of the air cooler is additionally connected with a tower top product extraction pipeline, a tower top product extraction valve is arranged on the tower top product extraction pipeline, and the tower top product extraction valve and the flow display and control device are controlled in a dual-lock mode.
The tower plates are arranged in 2 layers in a staggered mode.
The middle part of the broken tower tray is provided with a lifting hole, and one side of the broken tower tray is provided with a liquid drainage channel.
Compared with the prior art, the beneficial effects of the utility model are that:
1) compared with the conventional external reflux mode, the utility model avoids the adverse factors caused by the direct standing of a large-diameter high-temperature pipeline on the top of the tower; the design and construction difficulty and cost are effectively reduced;
2) compared with the conventional internal reflux mode, the utility model can avoid the problems of installation, fixation and the like of the circulating water pipeline of the condenser at the tower top, and can accurately control the reflux quantity at the tower top;
3) the utility model utilizes the direct heat exchange of liquid and gas to condense the gas phase at the top of the tower, thereby omitting a condenser and a reflux tank at the top of the tower, reducing the equipment cost, and being beneficial to reducing the energy consumption by adopting an air cooler for cooling;
4) system easy operation, operation are stable, rational in infrastructure, take up an area of for a short time, easy control, product quality are good.
Drawings
FIG. 1 is a schematic structural diagram of a reflux system at the top of a distillation tower of the present invention.
In the figure: 1. distillation tower 2, reflux pump 3, air cooler 4, tower bottom reboiler 5, tower bottom product extraction pump 6, tower breaking tray 7, tower plate 8, spraying device 9, temperature display and control device I10, regulating valve 11, temperature display and control device II 12, flow regulating valve 13, flow display and control device I14, flow display and control device II 15, tower top product extraction valve
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, the reflux system of the distillation tower top of the utility model comprises a distillation tower 1, wherein the top of the distillation tower 1 is provided with a non-condensable gas outlet, the middle part is provided with a raw material inlet, the bottom is provided with a tower bottom reboiler 4 and a tower bottom product extraction outlet, the tower bottom product extraction outlet is connected with a tower bottom product pipeline, and the tower bottom product pipeline is provided with a tower bottom product extraction pump 5; the device also comprises a reflux pump 2 and an air cooler 3; the top of the distillation tower 1 is provided with a first temperature display and control device 9, the upper part of the distillation tower 1 is sequentially provided with a spraying device 8, a tower plate 7 and a tower breaking plate 6 from top to bottom, the spraying device 8 is connected with a spraying liquid pipeline outside the distillation tower 1, a regulating valve 10 is arranged on the spraying liquid pipeline close to the distillation tower 1, and the regulating valve 10 and the first temperature display and control device 9 are controlled in an interlocking manner; a condensate extraction outlet is arranged on one side of the tower body above a liquid discharge channel of the tower breaking plate 6 and is connected with a spray liquid pipeline through a condensate pipeline outside the distillation tower 1, and a reflux pump 2 and an air cooler 3 are sequentially arranged on the condensate pipeline along the flowing direction of the condensate; a reflux liquid inlet and a temperature display and control device II 11 are arranged on the tower body below the tower breaking tray 6, the reflux liquid inlet is connected with a condensate liquid pipeline at the downstream of the reflux pump 2 through a reflux liquid pipeline outside the distillation tower 1, a flow regulating valve 12 and a flow display and control device I13 are arranged on the reflux liquid pipeline, and the flow display and control device I13 is in interlocking control with the temperature display and control device II 11 and the flow regulating valve 12; a second flow display and control device 14 is arranged on the condensate pipeline at the downstream of the reflux pump 2, the condensate pipeline at the downstream of the air cooler 3 is additionally connected with a tower top product extraction pipeline, a tower top product extraction valve 15 is arranged on the tower top product extraction pipeline, and the tower top product extraction valve 15 and the second flow display and control device 14 are in interlocking control.
The tower plates 7 are arranged in 2 layers in a staggered mode.
The middle part of the tower breaking tray 6 is provided with a lifting hole, and one side of the tower breaking tray is provided with a liquid drainage channel.
The working method of the reflux system at the top of the distillation tower comprises the following steps:
1) raw material liquid is continuously added into the distillation tower 1 from the middle part of the distillation tower 1, a heat source generated by a reboiler 4 at the bottom of the distillation tower continuously supplies heat, and ascending gas flow and descending liquid flow in the distillation tower 1 are in mass transfer and heat transfer contact;
2) liquid phase materials led out from a tower breaking tray 6 at the upper part of the distillation tower 1 are pumped out by a reflux pump 2, one part of the liquid phase materials returns to the distillation tower 1 to be heated and refluxed, and the other part of the liquid phase materials is sent to an air cooler 3;
3) one part of the liquid cooled by the air cooler 3 returns to the top of the distillation tower for spraying, the gas phase at the top of the distillation tower is condensed through direct gas-liquid contact, and the other part of the liquid is extracted as a product at the top of the distillation tower; the liquid spraying amount at the top of the distillation tower is controlled according to the temperature at the top of the distillation tower, the thermal reflux amount is controlled by the temperature at the middle part of the distillation tower 1 and the flow linkage of reflux liquid, and the extraction amount of products at the top of the distillation tower is controlled according to the total extraction amount of a reflux pump 2;
4) the non-condensable gas which is not condensed at the top of the distillation tower enters a subsequent exhaust cleaning system, and if the non-condensable gas is a negative pressure tower, the non-condensable gas enters a vacuum pump system.
In the utility model, the upper part of the distillation tower 1 is provided with a broken tower tray 6; 2 tower plates 7 are arranged above the tower breaking tray 6 and used for gas mist catching; a reflux liquid inlet and a second temperature display and control device 11 are arranged on the tower wall of the distillation tower 1 below the tower breaking disc 6; the center of the tower breaking disc 6 is provided with a lifting hole, one side of the tower breaking disc is provided with a liquid drainage channel, the side wall of the distillation tower 1 at one side of the liquid drainage channel is provided with a condensate liquid extraction port, the condensate liquid extraction port is connected with an inlet of the reflux pump 2, an outlet of the reflux pump 2 is connected with a heat exchange medium inlet of the air cooler 3, and an outlet of the reflux pump 2 is simultaneously connected with a reflux liquid inlet on the distillation tower 1 through a reflux liquid pipeline; a first flow display and control device 13 and a flow regulating valve 12 are arranged on the reflux pipeline at the upstream of the reflux inlet, and the first flow display and control device 13 is in interlocking control with the flow regulating valve 12 and a second temperature display and control device 11; an outlet of a heat exchange medium of the air cooler 3 is connected with a spraying device at the top of the distillation tower through a spraying liquid pipeline, the spraying liquid pipeline is provided with an adjusting valve 10, the top of the distillation tower 1 is provided with a first temperature display and control device 9, a top product extraction pipeline is provided with a top product extraction valve 15, and a second flow display and control device 14 adjusts the opening degree of the top product extraction valve 15; the bottom of the distillation tower 1 is provided with a tower bottom reboiler 4 and a tower bottom material extraction outlet, the tower bottom material extraction outlet is connected with a tower bottom material extraction pipeline, and a tower bottom product extraction pump 5 is arranged on the tower bottom material extraction pipeline.
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 (3)
1. A reflux system at the top of a distillation tower comprises the distillation tower, wherein a non-condensable gas outlet is arranged at the top of the distillation tower, a raw material inlet is arranged at the middle part of the distillation tower, a tower bottom reboiler and a tower bottom product extraction outlet are arranged at the bottom of the distillation tower, the tower bottom product extraction outlet is connected with a tower bottom product pipeline, and a tower bottom product extraction pump is arranged on the tower bottom product pipeline; it is characterized by also comprising a reflux pump and an air cooler; the top of the distillation tower is provided with a first temperature display and control device, the upper part of the distillation tower is sequentially provided with a spraying device, a tower plate and a tower breaking plate from top to bottom, the spraying device is connected with a spraying liquid pipeline outside the distillation tower, a regulating valve is arranged on the spraying liquid pipeline close to the distillation tower, and the regulating valve and the first temperature display and control device are controlled in an interlocking manner; a condensate extraction outlet is arranged on one side of the tower body above the tower breaking disc liquid drainage channel, the condensate extraction outlet is connected with a spraying liquid pipeline through a condensate pipeline outside the distillation tower, and a reflux pump and an air cooler are sequentially arranged on the condensate pipeline along the flowing direction of the condensate; a reflux liquid inlet and a temperature display and control device II are arranged on the tower body below the tower breaking disc, the reflux liquid inlet is connected with a condensate liquid pipeline at the downstream of the reflux pump through a reflux liquid pipeline outside the distillation tower, a flow regulating valve and a flow display and control device I are arranged on the reflux liquid pipeline, and the flow display and control device I, the temperature display and control device II and the flow regulating valve are controlled in an interlocking manner; and a second flow display and control device is arranged on the condensate pipeline at the downstream of the reflux pump, the condensate pipeline at the downstream of the air cooler is additionally connected with a tower top product extraction pipeline, a tower top product extraction valve is arranged on the tower top product extraction pipeline, and the tower top product extraction valve and the flow display and control device are controlled in a dual-lock mode.
2. The reflux system for the top of distillation tower as set forth in claim 1, wherein said trays are 2-layer and staggered.
3. The reflux system at the top of distillation tower as claimed in claim 1, wherein said broken tray has a central rising hole and a side drain channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921431143.2U CN210845338U (en) | 2019-08-30 | 2019-08-30 | Reflux system at top of distillation tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921431143.2U CN210845338U (en) | 2019-08-30 | 2019-08-30 | Reflux system at top of distillation tower |
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| CN210845338U true CN210845338U (en) | 2020-06-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110433519A (en) * | 2019-08-30 | 2019-11-12 | 中冶焦耐(大连)工程技术有限公司 | A kind of return-flow system and method for distilling tower top |
-
2019
- 2019-08-30 CN CN201921431143.2U patent/CN210845338U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110433519A (en) * | 2019-08-30 | 2019-11-12 | 中冶焦耐(大连)工程技术有限公司 | A kind of return-flow system and method for distilling tower top |
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