CN211595460U - Energy-saving device based on aromatic extraction production flow optimization - Google Patents
Energy-saving device based on aromatic extraction production flow optimization Download PDFInfo
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- CN211595460U CN211595460U CN202020179447.0U CN202020179447U CN211595460U CN 211595460 U CN211595460 U CN 211595460U CN 202020179447 U CN202020179447 U CN 202020179447U CN 211595460 U CN211595460 U CN 211595460U
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Abstract
The utility model discloses an energy-saving device based on the optimization of aromatic extraction production flow, which comprises a benzene tower, a benzene tower bottom pump, a toluene tower top air cooler, a toluene/circulating water heat exchanger, a benzene tower bottom oil conveying pipeline and a control valve; the control valve includes first to fifth valves; the benzene tower bottom oil conveying pipeline comprises a benzene tower bottom conveying pipeline, an air cooling conveying pipeline, a cross-toluene tower top reflux tank reflux pump conveying pipeline, a water cooling conveying pipeline and a cross-toluene inspection tank conveying pipeline which are sequentially connected end to end. The utility model discloses a feasible production flow optimal design gives up the equipment of the unnecessary energy consumption of former flow, utilizes the usable equipment of indispensable former flow, increases necessary pipeline and valve simultaneously, has saved a large amount of electric energies to realize the zero loss of equipment, effectively improved comprehensive economic benefits.
Description
Technical Field
The utility model relates to a petrochemical industry energy utilization field, concretely relates to economizer based on production flow optimization is extracted to arene.
Background
In the case of the existing aromatics extraction plant, when a scheme for simultaneously producing benzene, toluene and mixed xylene is adopted, benzene bottom oil is pumped from the bottom of the benzene column to the toluene column. The toluene column has 66 float valve trays; the benzene bottoms entered the toluene column at tray 34. Condensing toluene steam at the top of the toluene tower through an air cooler at the top of the toluene tower, and allowing condensate to automatically flow into a toluene reflux tank; and the liquid phase at the bottom of the reflux tank is pressurized by a toluene reflux pump and then is analyzed and formed on line by an analyzer, one part of the liquid phase is returned to the top of the toluene tower as reflux, the rest of the toluene product is cooled by a water cooler and then is sent out of the device to a toluene product inspection tank, and the toluene product is sent out of the device by a pump after being inspected to be qualified. And distilling a small amount of xylene-containing components from the bottom of the toluene tower, pumping the xylene-containing components through a toluene tower bottom pump, pressurizing the xylene-containing components, returning the xylene-containing components to a reformate fractionating tower or sending the xylene-containing components to gasoline blending along with C9+ aromatic hydrocarbons. The reboiler at the bottom of the toluene tower adopts xylene tower overhead gas as a heat source, and the heating load is adjusted through the amount of xylene. However, when benzene and mixed xylene are produced or only benzene is produced, toluene is not produced, and if the toluene column and reflux facilities are continuously used, a large amount of electric energy is consumed by the pump. Therefore, the waste of energy utilization will affect the overall economic efficiency of the whole plant.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides an energy-saving device based on the optimization of the aromatic extraction production flow.
The technical scheme is as follows: the system comprises a benzene tower, a benzene tower bottom pump, a toluene tower top air cooler, a toluene/circulating water heat exchanger, a benzene tower bottom oil conveying pipeline and a control valve; the control valve comprises a first valve, a second valve, a third valve, a fourth valve and a fifth valve; the benzene tower bottom oil conveying pipeline comprises a benzene tower bottom conveying pipeline, an air cooling conveying pipeline, a cross-toluene tower top reflux tank reflux pump conveying pipeline, a water cooling conveying pipeline and a cross-toluene inspection tank conveying pipeline which are sequentially connected end to end; the initial end of the benzene tower bottom conveying pipeline is connected to the bottom of the benzene tower, and a benzene tower bottom pump and a first valve are sequentially connected in series on a circuit; a second valve and a toluene tower top air cooler are sequentially connected in series on the line of the air cooling conveying pipeline; a third valve is arranged on a line of a conveying pipeline of a reflux pump of the toluene-crossing tower top reflux tank; a toluene/circulating water heat exchanger and a fourth valve are sequentially connected in series on the line of the water-cooling conveying pipeline; and a fifth valve is arranged on the line of the transfer line of the cross-toluene inspection tank, and the tail end of the fifth valve is communicated with the product tank area.
The above technical solution can be further optimized as follows:
the toluene/circulating water heat exchanger adopts a U-shaped tubular heat exchanger.
And the benzene tower bottom pump adopts a shield pump.
And the air cooler at the top of the toluene tower adopts a forced ventilation air cooler.
The material of the benzene tower bottom oil conveying pipeline is carbon steel.
Compared with the prior art, the utility model discloses mainly have following beneficial technological effect:
1. when toluene is not produced, the toluene tower is cut off, the procedure that the bottom oil of the benzene tower enters the toluene tower is eliminated, and the toluene tower top reflux tank, the toluene tower top reflux pump, the toluene tower bottom pump and the toluene tower bottom reboiler are stopped, so that the equipment loss is reduced, a large amount of electric energy is saved, and the comprehensive economic benefit is effectively improved.
2. Through feasible production flow optimization design, equipment which is unnecessary in the original flow and consumes energy is abandoned, the indispensable available equipment in the original flow is utilized, and necessary conveying pipelines and valves are added, so that the bottom oil of the benzene tower directly enters a toluene tower top air cooler through a tower bottom pump, and enters a toluene/circulating water heat exchanger to a finished product tank area after being cooled, the energy consumption is successfully saved, and the cost reduction and the efficiency improvement are really realized.
3. Reasonable layout and convenient control.
4. The equipment type selection and material are emphasized, and the method is safe and reliable.
Drawings
FIG. 1 is a schematic view of the structure layout and the direction of fluid inside the pipeline of the present invention;
in the figure: the system comprises a 1-benzene tower, a 2-benzene tower bottom conveying pipeline, a 3-benzene tower bottom pump, a 4-first valve, a 5-air cooling conveying pipeline, a 6-second valve, a 7-toluene tower top air cooler, an 8-third valve, a 9-toluene tower top reflux tank reflux pump conveying pipeline, a 10-toluene/circulating water heat exchanger, an 11-water cooling conveying pipeline, a 12-fourth valve, a 13-fifth valve, a 14-toluene tower inspection tank conveying pipeline, a 15-toluene tower, a 16-toluene tower top reflux tank and a 17-toluene tower top reflux pump.
Detailed Description
The present invention will be described in detail with reference to the following embodiments and accompanying drawings.
Example 1
Refer to fig. 1. An energy-saving device based on optimization of an aromatic extraction production flow comprises a benzene tower 1, a benzene tower bottom pump 3, a toluene tower top air cooler 7, a toluene/circulating water heat exchanger 10, a benzene tower bottom oil conveying pipeline and a control valve. The control valves include a first valve 4, a second valve 6, a third valve 8, a fourth valve 12, and a fifth valve 13. The benzene tower bottom oil conveying pipeline comprises a benzene tower bottom conveying pipeline 2, an air cooling conveying pipeline 5, a cross-toluene tower top reflux tank reflux pump conveying pipeline 9, a water cooling conveying pipeline 11 and a cross-toluene inspection tank conveying pipeline 14 which are sequentially connected end to end. The beginning of the benzene tower bottom conveying pipeline 2 is connected to the bottom of the benzene tower 1, and a benzene tower bottom pump 3 and a first valve 4 are sequentially connected in series on the line. And a second valve 6 and a toluene tower overhead air cooler 7 are sequentially connected in series on the line of the air cooling conveying pipeline 5. And a third valve 8 is arranged on the line of a return pump conveying line 9 of the cross toluene tower top return tank. A toluene/circulating water heat exchanger 10 and a fourth valve 12 are connected in series on the line of the water-cooling conveying pipeline 11 in sequence. A fifth valve 13 is installed in line across the toluene inspection tank transfer line 14, the end of which leads to the product tank farm.
Example 2
Refer to fig. 1. An energy-saving device based on optimization of an aromatic extraction production flow comprises a benzene tower 1, a benzene tower bottom pump 3, a toluene tower top air cooler 7, a toluene/circulating water heat exchanger 10, a benzene tower bottom oil conveying pipeline and a control valve. The control valves include a first valve 4, a second valve 6, a third valve 8, a fourth valve 12, and a fifth valve 13. The benzene tower bottom oil conveying pipeline comprises a benzene tower bottom conveying pipeline 2, an air cooling conveying pipeline 5, a cross-toluene tower top reflux tank reflux pump conveying pipeline 9, a water cooling conveying pipeline 11 and a cross-toluene inspection tank conveying pipeline 14 which are sequentially connected end to end. The beginning of the benzene tower bottom conveying pipeline 2 is connected to the bottom of the benzene tower 1, and a benzene tower bottom pump 3 and a first valve 4 are sequentially connected in series on the line. And a second valve 6 and a toluene tower overhead air cooler 7 are sequentially connected in series on the line of the air cooling conveying pipeline 5. And a third valve 8 is arranged on the line of a return pump conveying line 9 of the cross toluene tower top return tank. A toluene/circulating water heat exchanger 10 and a fourth valve 12 are connected in series on the line of the water-cooling conveying pipeline 11 in sequence. A fifth valve 13 is installed in line across the toluene inspection tank transfer line 14, the end of which leads to the product tank farm.
The toluene/circulating water heat exchanger 10 is a U-shaped tubular heat exchanger having a simple structure, a low cost, a good heat transfer performance, and a strong pressure-bearing capacity.
Example 3
Refer to fig. 1. An energy-saving device based on optimization of an aromatic extraction production flow comprises a benzene tower 1, a benzene tower bottom pump 3, a toluene tower top air cooler 7, a toluene/circulating water heat exchanger 10, a benzene tower bottom oil conveying pipeline and a control valve. The control valves include a first valve 4, a second valve 6, a third valve 8, a fourth valve 12, and a fifth valve 13. The benzene tower bottom oil conveying pipeline comprises a benzene tower bottom conveying pipeline 2, an air cooling conveying pipeline 5, a cross-toluene tower top reflux tank reflux pump conveying pipeline 9, a water cooling conveying pipeline 11 and a cross-toluene inspection tank conveying pipeline 14 which are sequentially connected end to end. The beginning of the benzene tower bottom conveying pipeline 2 is connected to the bottom of the benzene tower 1, and a benzene tower bottom pump 3 and a first valve 4 are sequentially connected in series on the line. And a second valve 6 and a toluene tower overhead air cooler 7 are sequentially connected in series on the line of the air cooling conveying pipeline 5. And a third valve 8 is arranged on the line of a return pump conveying line 9 of the cross toluene tower top return tank. A toluene/circulating water heat exchanger 10 and a fourth valve 12 are connected in series on the line of the water-cooling conveying pipeline 11 in sequence. A fifth valve 13 is installed in line across the toluene inspection tank transfer line 14, the end of which leads to the product tank farm.
The toluene/circulating water heat exchanger 10 adopts a U-shaped tubular heat exchanger which has a simple structure, low manufacturing cost, good heat transfer performance and strong pressure bearing capacity; the benzene tower bottom pump 3 adopts a shield pump, and the pump can realize no leakage completely, thereby ensuring the safe reliability of the operation of the device.
Example 4
Refer to fig. 1. An energy-saving device based on optimization of an aromatic extraction production flow comprises a benzene tower 1, a benzene tower bottom pump 3, a toluene tower top air cooler 7, a toluene/circulating water heat exchanger 10, a benzene tower bottom oil conveying pipeline and a control valve. The control valves include a first valve 4, a second valve 6, a third valve 8, a fourth valve 12, and a fifth valve 13. The benzene tower bottom oil conveying pipeline comprises a benzene tower bottom conveying pipeline 2, an air cooling conveying pipeline 5, a cross-toluene tower top reflux tank reflux pump conveying pipeline 9, a water cooling conveying pipeline 11 and a cross-toluene inspection tank conveying pipeline 14 which are sequentially connected end to end. The beginning of the benzene tower bottom conveying pipeline 2 is connected to the bottom of the benzene tower 1, and a benzene tower bottom pump 3 and a first valve 4 are sequentially connected in series on the line. And a second valve 6 and a toluene tower overhead air cooler 7 are sequentially connected in series on the line of the air cooling conveying pipeline 5. And a third valve 8 is arranged on the line of a return pump conveying line 9 of the cross toluene tower top return tank. A toluene/circulating water heat exchanger 10 and a fourth valve 12 are connected in series on the line of the water-cooling conveying pipeline 11 in sequence. A fifth valve 13 is installed in line across the toluene inspection tank transfer line 14, the end of which leads to the product tank farm.
The toluene/circulating water heat exchanger 10 adopts a U-shaped tubular heat exchanger which has a simple structure, low manufacturing cost, good heat transfer performance and strong pressure bearing capacity; the benzene tower bottom pump 3 adopts a shield pump which can realize no leakage and ensure the safe reliability of the operation of the device; the toluene tower top air cooler 7 adopts a forced draft air cooler, and an axial flow fan is used for supplying air to the tube bundle, so that the electricity consumption is low, and the manufacturing cost is low.
Example 5
Refer to fig. 1. An energy-saving device based on optimization of an aromatic extraction production flow comprises a benzene tower 1, a benzene tower bottom pump 3, a toluene tower top air cooler 7, a toluene/circulating water heat exchanger 10, a benzene tower bottom oil conveying pipeline and a control valve. The control valves include a first valve 4, a second valve 6, a third valve 8, a fourth valve 12, and a fifth valve 13. The benzene tower bottom oil conveying pipeline comprises a benzene tower bottom conveying pipeline 2, an air cooling conveying pipeline 5, a cross-toluene tower top reflux tank reflux pump conveying pipeline 9, a water cooling conveying pipeline 11 and a cross-toluene inspection tank conveying pipeline 14 which are sequentially connected end to end. The beginning of the benzene tower bottom conveying pipeline 2 is connected to the bottom of the benzene tower 1, and a benzene tower bottom pump 3 and a first valve 4 are sequentially connected in series on the line. And a second valve 6 and a toluene tower overhead air cooler 7 are sequentially connected in series on the line of the air cooling conveying pipeline 5. And a third valve 8 is arranged on the line of a return pump conveying line 9 of the cross toluene tower top return tank. A toluene/circulating water heat exchanger 10 and a fourth valve 12 are connected in series on the line of the water-cooling conveying pipeline 11 in sequence. A fifth valve 13 is installed in line across the toluene inspection tank transfer line 14, the end of which leads to the product tank farm.
The toluene/circulating water heat exchanger 10 adopts a U-shaped tubular heat exchanger which has a simple structure, low manufacturing cost, good heat transfer performance and strong pressure bearing capacity; the benzene tower bottom pump 3 adopts a shield pump which can realize no leakage and ensure the safe reliability of the operation of the device; the toluene tower top air cooler 7 adopts a forced draft air cooler, and an axial flow fan is used for supplying air to the tube bundle, so that the electricity consumption is low and the manufacturing cost is low; the material of the benzene tower bottom oil conveying pipeline is carbon steel.
The utility model discloses a basic work flow as follows:
pumping the benzene tower bottom oil at 140 ℃ from the benzene tower 1 by a benzene tower bottom pump 3, and directly conveying the benzene tower bottom oil to a toluene tower top air cooler 7 through a benzene tower bottom conveying pipeline 2 and an air cooling conveying pipeline 5 to be cooled to 35 ℃; then the mixture is sent to a toluene/circulating water heat exchanger 10 through a return pump conveying pipeline 9 of a return tank on the top of the cross toluene tower for heat exchange and then is cooled to 25 ℃; finally, the oil product is delivered to a product tank area outlet device for oil product blending through a cross-toluene inspection tank delivery pipeline 14.
Claims (5)
1. An economizer based on aromatic extraction production flow is optimized which characterized in that: the system comprises a benzene tower, a benzene tower bottom pump, a toluene tower top air cooler, a toluene/circulating water heat exchanger, a benzene tower bottom oil conveying pipeline and a control valve; the control valve comprises a first valve, a second valve, a third valve, a fourth valve and a fifth valve; the benzene tower bottom oil conveying pipeline comprises a benzene tower bottom conveying pipeline, an air cooling conveying pipeline, a cross-toluene tower top reflux tank reflux pump conveying pipeline, a water cooling conveying pipeline and a cross-toluene inspection tank conveying pipeline which are sequentially connected end to end; the initial end of the benzene tower bottom conveying pipeline is connected to the bottom of the benzene tower, and a benzene tower bottom pump and a first valve are sequentially connected in series on a circuit; a second valve and a toluene tower top air cooler are sequentially connected in series on the line of the air cooling conveying pipeline; a third valve is arranged on a line of a conveying pipeline of a reflux pump of the toluene-crossing tower top reflux tank; a toluene/circulating water heat exchanger and a fourth valve are sequentially connected in series on the line of the water-cooling conveying pipeline; and a fifth valve is arranged on the line of the transfer line of the cross-toluene inspection tank, and the tail end of the fifth valve is communicated with the product tank area.
2. The energy-saving device based on the optimization of the aromatic extraction production flow according to claim 1, which is characterized in that: the toluene/circulating water heat exchanger adopts a U-shaped tubular heat exchanger.
3. The energy-saving device based on the optimization of the aromatic extraction production flow according to claim 2, which is characterized in that: and the benzene tower bottom pump adopts a shield pump.
4. The energy-saving device based on the optimization of the aromatic extraction production flow according to claim 3, which is characterized in that: and the air cooler at the top of the toluene tower adopts a forced ventilation air cooler.
5. The energy-saving device based on the optimization of the aromatic extraction production flow according to claim 4, which is characterized in that: the material of the benzene tower bottom oil conveying pipeline is carbon steel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020179447.0U CN211595460U (en) | 2020-02-18 | 2020-02-18 | Energy-saving device based on aromatic extraction production flow optimization |
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| CN202020179447.0U CN211595460U (en) | 2020-02-18 | 2020-02-18 | Energy-saving device based on aromatic extraction production flow optimization |
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