CN213609863U - Tower top heat taking device of toluene tower of aromatic hydrocarbon combination device - Google Patents
Tower top heat taking device of toluene tower of aromatic hydrocarbon combination device Download PDFInfo
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- CN213609863U CN213609863U CN202021728366.8U CN202021728366U CN213609863U CN 213609863 U CN213609863 U CN 213609863U CN 202021728366 U CN202021728366 U CN 202021728366U CN 213609863 U CN213609863 U CN 213609863U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The utility model discloses a tower top heat-taking device of a toluene tower of an aromatic hydrocarbon combination device, which is characterized by comprising a toluene tower reflux tank, a toluene tower reflux pump and a heat exchanger, wherein a pressure regulating and controlling pipe, a heat exchange branch pipe and a heating branch pipe are connected between a tower top gas outlet of the toluene tower and the toluene tower reflux tank; a differential pressure control valve is arranged on the pressure regulating and controlling pipe; the heat exchange branch pipes are connected in series on a heat medium channel of the heat exchanger, a refrigerant inlet pipe is connected to a refrigerant inlet of the heat exchanger, and a refrigerant outlet pipe is connected to a refrigerant outlet of the heat exchanger; the heating branch pipe is connected to the bottom of a toluene tower reflux tank after passing through a tower bottom heater of the benzene tower, a liquid outlet of the toluene tower reflux tank is communicated with an inlet of a toluene tower reflux pump, and an outlet of the toluene tower reflux pump is communicated with a reflux port at the top of the toluene tower through a reflux pipe. In the application, a heat exchanger is additionally arranged between the toluene column reflux tank and the gas outlet at the top of the toluene column, and heat energy in redundant gas discharged from the toluene column is recovered by using the heat exchanger.
Description
Technical Field
The utility model relates to a toluene tower top heat extraction device of aromatic hydrocarbon integrated device.
Background
The toluene tower of the aromatic hydrocarbon combination device supplies heat by a reboiling furnace at the bottom of the toluene tower, the air cooling and the water cooling are arranged at the top of the toluene tower to provide gas phase cooling power, the separation of toluene and heavy components with eight or more carbon atoms is realized in the toluene tower through the rectification process, the toluene is ejected out of the toluene tower, and the heavy components with eight or more carbon atoms are ejected out of the bottom of the toluene tower.
And after the top of the toluene tower is pressurized to 0.45MPa, the temperature of the top of the toluene tower is increased to 183 ℃, the operating temperature of the bottom of the benzene tower is 149 ℃, and the top gas of the toluene tower returns to the toluene tower reflux tank after the heat source is provided by the benzene tower. Meanwhile, a control valve is arranged between the top of the toluene tower and the reflux tank of the toluene tower to establish differential pressure so as to provide heat source driving force.
In order to meet the qualified separation performance of the top component and the bottom component of the toluene tower, the toluene tower needs to reach a certain reflux ratio under the pressurization working condition so as to be beneficial to the product quality reaching the standard.
According to the original design working condition, on the premise that the gas phase quantity at the top of the toluene tower meets the heat supply of the benzene tower, 183 ℃ high-temperature gas is still remained, and the gas is directly cooled through matched air cooling at the top of the toluene tower. In the process link of air cooling of the gas at the top of the crude toluene tower, the air cooling power consumption at the top of the toluene tower is increased, and most of high-temperature heat is directly lost, so that the cost reduction and the efficiency improvement of the device are not facilitated.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a toluene tower top heat-taking device of an aromatic hydrocarbon combination device, which is characterized by comprising a toluene tower reflux tank, a toluene tower reflux pump and a heat exchanger, wherein a pressure regulating and controlling pipe, a heat exchange branch pipe and a heating branch pipe are connected between a toluene tower top gas outlet and the toluene tower reflux tank;
a differential pressure control valve is arranged on the pressure regulating and controlling pipe; the heat exchange branch pipes are connected in series on a heat medium channel of the heat exchanger, a refrigerant inlet pipe is connected to a refrigerant inlet of the heat exchanger, and a refrigerant outlet pipe is connected to a refrigerant outlet of the heat exchanger; the heating branch pipe is connected to the bottom of a toluene tower reflux tank after passing through a tower bottom heater of the benzene tower, a liquid outlet of the toluene tower reflux tank is communicated with an inlet of a toluene tower reflux pump, and an outlet of the toluene tower reflux pump is communicated with a reflux port at the top of the toluene tower through a reflux pipe.
In the application, a heat exchanger is additionally arranged between the toluene column reflux tank and the gas outlet at the top of the toluene column, and heat energy in redundant gas discharged from the toluene column is recovered by using the heat exchanger. The tower top gas of the toluene tower is fully condensed while the heat energy is recovered. After the heat exchanger is newly added, the toluene tower is maintained on the basis of high yield, the differential pressure between the top of the toluene tower and the toluene tower reflux tank can be controlled through the opening of the differential pressure control valve, and the gas at the top of the toluene tower can be ensured to return to the toluene tower reflux tank after heat supply is finished.
Furthermore, in order to avoid the problem that the condensation amount of the tower top device of the toluene tower cannot meet the requirement when the heat exchanger fails, an air cooling pipe is connected between the tower top air outlet of the toluene tower and the toluene tower reflux tank, and an air cooler is connected in series on the air cooling pipe. When the heat exchanger breaks down, can condense tower overhead gas with the air cooler temporarily, guarantee the normal clear of production.
Further, in order to adjust the flow of the top gas entering the air cooler, a second adjusting valve is installed on an air cooling pipe between the top gas outlet of the toluene tower and the air cooler.
Further, in order to facilitate the continuous operation of the refrigerant when the heat exchanger is overhauled, switching valves are installed at the inlet and the outlet of a refrigerant channel of the heat exchanger, a short connecting pipe is connected between a refrigerant inlet pipe and a refrigerant outlet pipe, the short connecting pipe spans the heat exchanger and the switching valves, and a cut-off valve is installed on the short connecting pipe. When the heat exchanger is overhauled, the stop valve can be opened, the switching valve is closed, the heat exchange water inlet short-circuiting pipe continues to operate, and when the overhaul is completed, the switching valve is opened, the stop valve is closed, and the heat exchange water continues to flow through the refrigerant channel of the heat exchanger.
Furthermore, in order to adjust the flow of the tower top gas entering the heat exchanger, a first adjusting valve is arranged on a heat medium inlet of the heat exchanger, and an opening and closing valve is arranged on a heat medium outlet of the heat exchanger.
In order to facilitate monitoring of the leakage condition of the heat exchanger and avoid leakage of the heat exchanger, a large amount of heat exchange water enters the toluene condensate, and a moisture detector is arranged on a heat exchange branch pipe between the heat exchanger and the toluene tower reflux tank.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
Referring to fig. 1, an overhead heat removal device of a toluene column 14 of an aromatics complex comprises a toluene column reflux drum 50, a toluene column reflux pump 13 and a heat exchanger 2, wherein the heat exchanger 2 is a plate heat exchanger in this embodiment. A gas outlet 31 at the top of the toluene tower is connected with a main gas outlet pipe 30, and a pressure regulating and controlling pipe 20, a heat exchange branch pipe 24 and a heating branch pipe 18 are connected between the main gas outlet pipe 30 and a material inlet 51 at the top of a reflux tank of the toluene tower.
A differential pressure control valve 10 is mounted on the pressure regulating pipe. The heat exchange branch pipe 24 is connected in series to a heat medium channel of the heat exchanger 2, the refrigerant inlet pipe 4 is connected to a refrigerant inlet of the heat exchanger 2, and the refrigerant outlet pipe 5 is connected to a refrigerant outlet of the heat exchanger 2. The heat exchanger 2 divides the heat exchange branch pipe 24 into a feed pipe 27 and a discharge pipe 29, a first regulating valve 28 is installed on the feed pipe, an opening and closing valve 8 is installed on the discharge pipe, namely, the first regulating valve 28 is installed on a heat medium inlet of the heat exchanger, and the opening and closing valve is installed on a heat medium outlet of the heat exchanger.
A switching valve 25 is installed at the inlet and the outlet of the refrigerant channel for heat exchange, a short connecting pipe 6 is connected between the refrigerant inlet pipe 4 and the refrigerant outlet pipe 5, the short connecting pipe spans the heat exchanger and the switching valve, and a cut-off valve 61 is installed on the short connecting pipe 6. And a moisture detector 11 is installed on the discharging pipe 29, and the moisture detector 11 is an on-line analyzer for monitoring whether the heat exchanger leaks.
The heating branch pipe 18 is connected to the liquid inlet 52 at the bottom of the toluene column reflux tank after passing through the column bottom heater of the benzene column, and the connection mode between the heating branch pipe and the column bottom heater of the benzene column adopts the prior art and is not described again.
The liquid outlet 53 of the toluene column reflux tank is connected to the inlet of the toluene column reflux pump 13, and the outlet of the toluene column reflux pump 13 is connected to the reflux port 32 at the top of the toluene column via the reflux pipe 26. A valve set 40 is installed on the return pipe 26, the valve set 40 comprises a regulating valve 41 connected in series on the return pipe and a disconnecting valve 42 installed on both sides of the regulating valve, a bypass pipe 43 is connected to the return pipe 26 after crossing the disconnecting valve and the regulating valve, and a bypass valve 44 is installed on the bypass pipe 43.
A non-condensable gas discharge port 54 and a safety valve 55 are provided at the top of the toluene column reflux drum 50, the non-condensable gas discharge port 54 is connected to a torch, a third regulating valve 57 is installed at the non-condensable gas discharge port, and a gate valve 56 is installed at the outlet of the safety valve 55.
In this embodiment, an air cooling pipe 23 is connected between the total gas outlet pipe 30 and the material inlet 51 of the toluene column reflux drum, and an air cooler 9 is connected in series to the air cooling pipe. And a second regulating valve 3 is arranged on the air cooling pipe between the main air outlet pipe 30 and the air cooler.
A pressure gauge 33 is installed on the main outlet duct 30, the pressure gauge 33 is connected to a PLC board 34, and the first and second regulating valves 28 and 3 are connected to the PLC board 34, and the opening degrees of the first and second regulating valves 28 and 3 are adjusted according to the pressure detected by the pressure gauge.
The bottom discharge pipe of the toluene column is returned to the toluene column after passing through a bottom pump 17 and a heating furnace 16 in this order, and a bottom discharge pipe 15 is connected to the outlet of the bottom pump 17.
Claims (6)
1. A tower top heat-taking device of a toluene tower of an aromatic hydrocarbon combination device is characterized by comprising a toluene tower reflux tank, a toluene tower reflux pump and a heat exchanger, wherein a pressure regulating and controlling pipe, a heat exchange branch pipe and a heating branch pipe are connected between a tower top air outlet of the toluene tower and the toluene tower reflux tank;
a differential pressure control valve is arranged on the pressure regulating and controlling pipe; the heat exchange branch pipes are connected in series on a heat medium channel of the heat exchanger, a refrigerant inlet pipe is connected to a refrigerant inlet of the heat exchanger, and a refrigerant outlet pipe is connected to a refrigerant outlet of the heat exchanger; the heating branch pipe is connected to the bottom of a toluene tower reflux tank after passing through a tower bottom heater of the benzene tower, a liquid outlet of the toluene tower reflux tank is communicated with an inlet of a toluene tower reflux pump, and an outlet of the toluene tower reflux pump is communicated with a reflux port at the top of the toluene tower through a reflux pipe.
2. The overhead heat removal device of claim 1,
an air cooling pipe is connected between the outlet at the top of the toluene tower and the toluene tower reflux tank, and an air cooler is connected in series on the air cooling pipe.
3. The overhead heat removal device of claim 2,
and a second regulating valve is arranged on the air cooling pipe between the air outlet at the top of the toluene tower and the air cooler.
4. The tower top heat extraction device according to claim 1, wherein switching valves are installed at an inlet and an outlet of a refrigerant channel of the heat exchanger, a nipple is connected between the refrigerant inlet pipe and the refrigerant outlet pipe, the nipple spans the heat exchanger and the switching valves, and a shut-off valve is installed on the nipple.
5. The overhead heat removal device of claim 1,
a first regulating valve is arranged on a heat medium inlet of the heat exchanger, and an opening and closing valve is arranged on a heat medium outlet of the heat exchanger.
6. The overhead heat removal device of claim 1, wherein a moisture detector is installed on the heat exchange branch pipe between the heat exchanger and the toluene column reflux drum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021728366.8U CN213609863U (en) | 2020-08-18 | 2020-08-18 | Tower top heat taking device of toluene tower of aromatic hydrocarbon combination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021728366.8U CN213609863U (en) | 2020-08-18 | 2020-08-18 | Tower top heat taking device of toluene tower of aromatic hydrocarbon combination device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213609863U true CN213609863U (en) | 2021-07-06 |
Family
ID=76644652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021728366.8U Active CN213609863U (en) | 2020-08-18 | 2020-08-18 | Tower top heat taking device of toluene tower of aromatic hydrocarbon combination device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213609863U (en) |
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2020
- 2020-08-18 CN CN202021728366.8U patent/CN213609863U/en active Active
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