CN210186474U - System for controlling tower top reflux amount in tar processing and benzene hydrogenation processes - Google Patents
System for controlling tower top reflux amount in tar processing and benzene hydrogenation processes Download PDFInfo
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- CN210186474U CN210186474U CN201920773791.XU CN201920773791U CN210186474U CN 210186474 U CN210186474 U CN 210186474U CN 201920773791 U CN201920773791 U CN 201920773791U CN 210186474 U CN210186474 U CN 210186474U
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Abstract
The utility model relates to a system for controlling the reflux quantity at the top of a tower in the processes of tar processing and benzene hydrogenation, which comprises a distillation tower, a condenser at the top of the tower, a cooler at the top of the tower, a reflux tank and a reflux pump; the tower top condenser is directly arranged at the top of the distillation tower, a condensate outlet at the bottom of the tower top condenser is communicated with the tower body above the liquid breaking disc, and a condensate extraction outlet is arranged on the side wall of the distillation tower at one side of the liquid breaking disc liquid drainage channel and is connected with a reflux groove through a tower top cooler; the reflux tank is connected with a reflux inlet on the distillation tower through a reflux pipeline; the reflux liquid pipeline is provided with a flow display and control device and a flow regulating valve, and the flow display and control device is interlocked with the flow regulating valve and the temperature display and control device on the distillation tower. The utility model discloses can enough avoid because of the too big design difficulty, the difficult problem of construction that leads to of top of the tower gas phase pipeline pipe diameter, again can the accurate control tower reflux volume, the extensive distillation process system of specially adapted.
Description
Technical Field
The utility model relates to a distillation purification technical field in tar processing, benzene hydrogenation technology especially relates to a system of control top of tower backward flow volume in tar processing, benzene hydrogenation technology
Background
At present, the small-scale distillation process flow adopts an external reflux mode, gas-phase materials distilled from the top of a distillation tower enter a reflux tank after being cooled in a condensation cooler, the gas-phase materials are pumped out by a reflux pump, one part of the materials return to the top of the tower as reflux, and the other part of the materials are 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.
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, for example: in a 20-kiloton/year tar distillation unit of a certain plant, the pipe diameter of an outlet at the top of a main distillation tower is DN 500; in 15 ten thousand tons/year benzene hydrogenation projects of a certain plant, the diameters of the top outlets of a stripping tower, a benzene/toluene distillation tower and a xylene distillation tower are DN500, DN400 and DN350 respectively. Because the temperature of the outlet at the top of the tower is higher, if the pipe diameter of the gas phase pipeline is too large, the expansion amount of the gas phase pipeline is also increased, which is not beneficial to the stress analysis and the structural design of the supporting part; for the construction, the installation is not facilitated, and the construction cost is high.
The control mode of internal reflux is that the top condenser is directly arranged on the top of the distillation tower, and the gas-phase material on the top of the tower flows back into the tower automatically after being condensed.
Disclosure of Invention
The utility model provides a system for control top of tower backward flow volume in tar processing, benzene hydrogenation technology can enough avoid difficult, the difficult problem of construction of design because of the too big leading to of top of tower gas phase pipeline pipe diameter, again can accurate control tower backward flow volume, the large-scale distillation process systems of specially adapted.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the system for controlling the reflux amount at the top of the tower in the processes of tar processing and benzene hydrogenation comprises a distillation tower, a tower top condenser, a tower top cooler, a reflux tank and a reflux pump; the tower top condenser is directly arranged at the top of the distillation tower; a liquid breaking disc is arranged in the distillation tower below the tower top condenser and above the tower plate or the filler, and a reflux liquid inlet and a temperature display and control device are arranged on the tower wall of the distillation tower below the liquid breaking disc; the top of the tower top condenser is provided with a non-condensable gas outlet, and a condensate outlet at the bottom of the tower top condenser is communicated with the tower body above the liquid breaking disc; the center of the liquid breaking disc is provided with a lifting hole, one side of the liquid breaking disc is provided with a liquid drainage channel, the side wall of the distillation tower at one side of the liquid drainage channel is provided with a condensate liquid extraction port, the condensate liquid extraction port is connected with a heat exchange medium inlet of the tower top cooler, and the heat exchange medium outlet of the tower top cooler is connected with a condensate liquid inlet at the top of the reflux groove; a reflux liquid outlet is arranged at the bottom of the reflux tank, the reflux liquid outlet is connected with a reflux liquid inlet on the distillation tower through a reflux liquid pipeline, and a reflux pump and a material extraction outlet are arranged on the reflux liquid pipeline; the material extraction port is connected with a material delivery pipeline; a liquid level display and control device is arranged on the reflux tank, a material extraction valve is arranged on the material delivery pipeline, and the liquid level display and control device and the material extraction valve are controlled in an interlocking manner; a flow display and control device and a flow regulating valve are arranged on the reflux pipeline at the upstream of the reflux inlet, and the flow display and control device is interlocked with the flow regulating valve and the temperature display and control device for control; the bottom of the distillation tower is provided with a tower bottom reboiler 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 extraction pump is arranged on the tower bottom material extraction pipeline.
The cross-sectional area of the lifting hole is 40-50% of the cross-sectional area of the distillation tower.
The cross-sectional area of the liquid drainage channel is 4-8% of the cross-sectional area of the distillation tower.
An overflow plate is arranged in the reflux groove, a condensate inlet and a reflux outlet are arranged on the reflux groove on one side of the overflow plate, and a wastewater outlet is arranged at the bottom of the reflux groove on the other side of the overflow plate.
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 accurately control the reflux quantity at the top of the tower;
3) 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 system for controlling the amount of reflux at the top of a tower in the tar processing and benzene hydrogenation processes of the present invention.
In the figure: 1. distillation tower 2, tower top condenser 3, tower top cooler 4, reflux tank 5, reflux pump 6, tower bottom reboiler 7, tower bottom extraction pump 8, liquid break disc 9, liquid level display and control device 10, material extraction valve 11, flow display and control device 12, flow control valve 13, temperature display and control device
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 system for controlling the reflux amount at the top of the tower in the tar processing and benzene hydrogenation processes of the present invention comprises a distillation tower 1, a tower top condenser 2, a tower top cooler 3, a reflux tank 4 and a reflux pump 5; the tower top condenser 2 is directly arranged at the top of the distillation tower 1; a liquid breaking disc 8 is arranged in the distillation tower 1 below the tower top condenser 2 and above the tower plate or the filler, and a reflux liquid inlet and a temperature display and control device 13 are arranged on the tower wall of the distillation tower 1 below the liquid breaking disc 8; the top of the tower top condenser 2 is provided with a non-condensable gas outlet, and a condensate outlet at the bottom is communicated with the tower body above the liquid breaking disc 8; the center of the liquid breaking disc 8 is provided with a lifting hole, one side of the liquid 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 a heat exchange medium inlet of the tower top cooler 3, and the heat exchange medium outlet of the tower top cooler 3 is connected with a condensate liquid inlet at the top of the reflux groove 4; a reflux liquid outlet is arranged at the bottom of the reflux tank 4, the reflux liquid outlet is connected with a reflux liquid inlet on the distillation tower 1 through a reflux liquid pipeline, and a reflux pump 5 and a material extraction outlet are arranged on the reflux liquid pipeline; the material extraction port is connected with a material delivery pipeline; a liquid level display and control device 9 is arranged on the reflux tank 4, a material extraction valve 10 is arranged on the material delivery pipeline, and the liquid level display and control device 9 and the material extraction valve 10 are controlled in an interlocking manner; a flow display and control device 11 and a flow regulating valve 12 are arranged on the reflux pipeline at the upstream of the reflux inlet, and the flow display and control device 11, the flow regulating valve 12 and the temperature display and control device 13 are controlled in an interlocking way; the bottom of the distillation tower 1 is provided with a tower bottom reboiler 6 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 extraction pump 7 is arranged on the tower bottom material extraction pipeline.
The cross-sectional area of the lifting hole is 40-50% of the cross-sectional area of the distillation tower 1.
The cross-sectional area of the liquid drainage channel is 4-8% of the cross-sectional area of the distillation tower 1.
An overflow plate is arranged in the reflux groove 4, a condensate inlet and a reflux outlet are arranged on the reflux groove 4 on one side of the overflow plate, and a wastewater outlet is arranged at the bottom of the reflux groove 4 on the other side of the overflow plate.
The temperature display and control device 13 is one type of temperature controller, and the flow display and control device 11 is one type of flow controller.
The technical process of the system for controlling the reflux quantity at the top of the tower in the tar processing and benzene hydrogenation processes is as follows:
1) raw material liquid is continuously added into the distillation tower 1 at the middle part of the tower, a heat source at the bottom of the tower continuously supplies heat, and ascending gas flow and descending liquid flow in the tower are in mass transfer and heat transfer contact;
2) the top of the distillation tower 1 is provided with a tower top condenser 2, and gas phase materials at the top of the distillation tower 1 directly enter the tower top condenser 2 for condensation through a rising hole at the center of the liquid breaking disc 8 after leaving the tower plate at the uppermost layer or the filler at the uppermost layer;
3) the non-condensable gas which is not condensed by the tower top condenser 2 enters an exhaust cleaning system, and enters a vacuum pump system if the non-condensable gas is in a negative pressure tower; the liquid condensed by the tower top condenser 2 is led out of the tower from a liquid drainage channel at one side of the liquid breaking disc 8, enters the tower top cooler 3, and enters the reflux tank 4 after being cooled;
4) the material in the reflux tank 4 is pumped out by a reflux pump 5, one part of the material is returned to the top of the distillation tower 1 as reflux, and the other part of the material is extracted; the reflux quantity is regulated by a temperature and flow cascade control system, namely, the output value of a temperature controller at the top of the distillation tower 1 is used as the set value of a flow controller, and the opening of a flow regulating valve 12 is controlled by the output of the flow controller, so that the reflux quantity is regulated.
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 (4)
1. The system for controlling the reflux quantity at the top of the tower in the processes of tar processing and benzene hydrogenation is characterized by comprising a distillation tower, a tower top condenser, a tower top cooler, a reflux tank and a reflux pump; the tower top condenser is directly arranged at the top of the distillation tower; a liquid breaking disc is arranged in the distillation tower below the tower top condenser and above the tower plate or the filler, and a reflux liquid inlet and a temperature display and control device are arranged on the tower wall of the distillation tower below the liquid breaking disc; the top of the tower top condenser is provided with a non-condensable gas outlet, and a condensate outlet at the bottom of the tower top condenser is communicated with the tower body above the liquid breaking disc; the center of the liquid breaking disc is provided with a lifting hole, one side of the liquid breaking disc is provided with a liquid drainage channel, the side wall of the distillation tower at one side of the liquid drainage channel is provided with a condensate liquid extraction port, the condensate liquid extraction port is connected with a heat exchange medium inlet of the tower top cooler, and the heat exchange medium outlet of the tower top cooler is connected with a condensate liquid inlet at the top of the reflux groove; a reflux liquid outlet is arranged at the bottom of the reflux tank, the reflux liquid outlet is connected with a reflux liquid inlet on the distillation tower through a reflux liquid pipeline, and a reflux pump and a material extraction outlet are arranged on the reflux liquid pipeline; the material extraction port is connected with a material delivery pipeline; a liquid level display and control device is arranged on the reflux tank, a material extraction valve is arranged on the material delivery pipeline, and the liquid level display and control device and the material extraction valve are controlled in an interlocking manner; a flow display and control device and a flow regulating valve are arranged on the reflux pipeline at the upstream of the reflux inlet, and the flow display and control device is interlocked with the flow regulating valve and the temperature display and control device for control; the bottom of the distillation tower is provided with a tower bottom reboiler 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 extraction pump is arranged on the tower bottom material extraction pipeline.
2. The system for controlling reflux at the top of a column in a tar processing and benzene hydrogenation process of claim 1, wherein the cross-sectional area of the lifting hole is 40-50% of the cross-sectional area of the distillation column.
3. The system for controlling the amount of overhead reflux in a tar processing and benzene hydrogenation process of claim 1, wherein the cross-sectional area of the drainage channel is 4-8% of the cross-sectional area of the distillation column.
4. The system for controlling the tower top reflux amount in the tar processing and benzene hydrogenation process according to claim 1, wherein an overflow plate is arranged in the reflux tank, the condensate inlet and the reflux outlet are arranged on the reflux tank on one side of the overflow plate, and the bottom of the reflux tank on the other side of the overflow plate is provided with a wastewater outlet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920773791.XU CN210186474U (en) | 2019-05-27 | 2019-05-27 | System for controlling tower top reflux amount in tar processing and benzene hydrogenation processes |
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| CN201920773791.XU CN210186474U (en) | 2019-05-27 | 2019-05-27 | System for controlling tower top reflux amount in tar processing and benzene hydrogenation processes |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110141884A (en) * | 2019-05-27 | 2019-08-20 | 中冶焦耐(大连)工程技术有限公司 | The method and system of tower top regurgitant volume are controlled in tar production, benzene hydrogenation process |
| CN111939584A (en) * | 2020-09-04 | 2020-11-17 | 中冶焦耐(大连)工程技术有限公司 | Process and system for evaporating crude benzene in benzene hydrogenation reaction system |
| CN112595133A (en) * | 2020-12-24 | 2021-04-02 | 中冶焦耐(大连)工程技术有限公司 | Industrial naphthalene vaporization and condensation cooler and working method thereof |
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2019
- 2019-05-27 CN CN201920773791.XU patent/CN210186474U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110141884A (en) * | 2019-05-27 | 2019-08-20 | 中冶焦耐(大连)工程技术有限公司 | The method and system of tower top regurgitant volume are controlled in tar production, benzene hydrogenation process |
| CN111939584A (en) * | 2020-09-04 | 2020-11-17 | 中冶焦耐(大连)工程技术有限公司 | Process and system for evaporating crude benzene in benzene hydrogenation reaction system |
| CN111939584B (en) * | 2020-09-04 | 2023-09-15 | 中冶焦耐(大连)工程技术有限公司 | Crude benzene evaporation process and system in benzene hydrogenation reaction system |
| CN112595133A (en) * | 2020-12-24 | 2021-04-02 | 中冶焦耐(大连)工程技术有限公司 | Industrial naphthalene vaporization and condensation cooler and working method thereof |
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