CN214327643U - Energy-saving aromatic hydrocarbon extraction device - Google Patents
Energy-saving aromatic hydrocarbon extraction device Download PDFInfo
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- CN214327643U CN214327643U CN202121645403.3U CN202121645403U CN214327643U CN 214327643 U CN214327643 U CN 214327643U CN 202121645403 U CN202121645403 U CN 202121645403U CN 214327643 U CN214327643 U CN 214327643U
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The utility model discloses an energy-saving aromatic hydrocarbon extraction device, which comprises a reformate fractionating tower, a benzene tower and a toluene tower, wherein the steam outlet at the top of the toluene tower is connected with the material inlet of a first cooler, the material outlet of the first cooler is connected with the inlet of a recooler, the first material outlet of the recooler is connected with the reflux inlet of the toluene tower, and the second material outlet of the recooler is an extraction outlet; the outlet of a storage tank for storing the heat exchange working medium is connected with the refrigerant inlet of the first cooler, the refrigerant outlet of the first cooler is connected with the inlet of a compressor, the outlet of the compressor is connected with the heat source inlet of the benzene tower reboiler, and the heat source outlet of the benzene tower reboiler is connected with the inlet of the storage tank. The utility model discloses be used for benzene tower cauldron with the heat recovery of toluene tower's top of the tower steam, saved the quantity of tower cauldron heating steam greatly, saved toluene tower top of the tower recirculated cooling water's quantity simultaneously, not only energy-conservation but also environmental protection.
Description
Technical Field
The utility model belongs to the technical field of chemical industry is energy-conserving, concretely relates to energy-conserving aromatic hydrocarbon extraction device.
Background
The aromatic extraction is to obtain high-purity mixed aromatic hydrocarbon by using pyrolysis hydrogenated gasoline as a raw material and adopting an extraction separation method. Raw oil firstly enters a reformate fractionating tower, the tower kettle produced liquid is sent to a xylene tower, C6-C7 mixed aromatic hydrocarbon produced at the tower top is distilled by an extraction distillation system and then enters a benzene tower for rectification, the tower top steam of the benzene tower is condensed to produce benzene serving as a product, crude toluene produced at the tower kettle is sent to a toluene tower for rectification, the toluene product is produced from the tower top, and the C8 component produced at the tower kettle returns to the reformate fractionating tower.
In the prior art, the problems of large steam consumption, insufficient heat energy utilization and the like generally exist.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide an energy-saving aromatic hydrocarbon extraction device.
The utility model discloses a realize through following technical scheme:
an energy-saving aromatic hydrocarbon extraction device comprises a reformate fractionating tower, a benzene tower and a toluene tower, wherein a tower top production pipeline of the reformate fractionating tower is connected with a feeding hole of the benzene tower, a tower bottom production pipeline of the benzene tower is connected with a feeding hole of the toluene tower, and the energy-saving aromatic hydrocarbon extraction device is characterized in that a tower top steam outlet of the toluene tower is connected with a material inlet of a first cooler, a material outlet of the first cooler is connected with an inlet of a recooler, a first material outlet of the recooler is connected with a reflux port of the toluene tower, and a second material outlet of the recooler is a production port; the outlet of a storage tank for storing the heat exchange working medium is connected with the refrigerant inlet of the first cooler, the refrigerant outlet of the first cooler is connected with the inlet of a compressor, the outlet of the compressor is connected with the heat source inlet of the benzene tower reboiler, and the heat source outlet of the benzene tower reboiler is connected with the inlet of the storage tank.
In the above technical scheme, the heat exchange working medium is water.
In the above technical scheme, a second cooler is arranged between the reboiler heat source outlet of the benzene tower and the storage tank, and the refrigerant of the second cooler is circulating cooling water.
In the above technical solution, the first cooler and the reboiler are in a horizontal tube falling film type.
In the technical scheme, the compressor is a double-screw compressor, a roots compressor or a centrifugal compressor.
The utility model discloses an advantage and beneficial effect do:
1. the technical scheme of the utility model in, be used for benzene tower cauldron with the heat recovery of toluene tower's top of the tower steam, saved the quantity of tower cauldron heating steam greatly, saved toluene tower top of the tower recirculated cooling water's quantity simultaneously, not only energy-conservation but also environmental protection.
2. The technical scheme of the utility model in, because of the easy liquefaction of toluene compression, use the heat transfer working medium as the heat transfer medium, make the device can move safely and stably when retrieving the heat.
3. The technical scheme energy-conserving effect of the utility model is showing, compares with the conventional art, can save about 62% operation working costs each year under the equal operating mode.
Drawings
Fig. 1 is a flowchart of embodiment 1 of the present invention.
Wherein, 1 is a first cooler, 2 is a recooler, 3 is a compressor, 4 is a benzene tower reboiler, 5 is a second cooler, 6 is a toluene tower, 7 is a benzene tower, 8 is a reformate fractionating tower, and 9 is a storage tank.
Detailed Description
In order to make the technical field of the present invention better understand, the technical solutions of the present invention are further described below with reference to the accompanying drawings and specific embodiments.
Example 1
An energy-saving aromatic hydrocarbon extraction device comprises a reformate fractionating tower 8, a benzene tower 7 and a toluene tower 6, wherein a tower top extraction pipeline of the reformate fractionating tower is connected with a feed inlet of the benzene tower, a tower bottom extraction pipeline of the benzene tower is connected with a feed inlet of the toluene tower, a tower top steam outlet of the toluene tower is connected with a material inlet of a first cooler 1, a material outlet of the first cooler is connected with an inlet of a recooler 2, a first material outlet of the recooler is connected with a reflux port of the toluene tower, and a second material outlet of the recooler is an extraction port and is used for extracting a toluene product; an outlet of a storage tank 9 for storing water is connected with a refrigerant inlet of the first cooler, a refrigerant outlet of the first cooler is connected with an inlet of the double-screw compressor, an outlet of the compressor 3 is connected with a heat source inlet of the benzene tower reboiler 4, a heat source outlet of the benzene tower reboiler is connected with an inlet of the second cooler 5, and an outlet of the second cooler is connected with an inlet of the storage tank.
The heat exchanger in the form is high in heat exchange efficiency, and a cold medium enters the horizontal tube falling film reboiler or the shell pass of the cooler through the circulating pump and is partially evaporated. The heat medium enters from the tube side and is condensed, and the two media simultaneously undergo phase change. The reboilers of both the reformate fractionator and the toluene column are heated with steam.
In the aromatics extraction apparatus of this example, the total amount of overhead vapor from the toluene column was 75000kg/h, and it was calculated that the heat load demand of the benzene column bottom could be met by compressing only a portion of the overhead vapor, i.e., 62500 kg/h. The temperature of a tower kettle of the benzene tower is 138 ℃, the temperature of a toluene tower top is 140 ℃, the pressure of the tower top is 220kPa, the steam at the tower top enters a first cooler to be condensed into tower top liquid, then the steam enters a recooler to be further cooled to 135 ℃ (both the recooler and a second cooler are cooled by circulating cooling water), wherein 56000kg/h of tower top liquid is taken as a product, and the rest of the tower top liquid flows back to the toluene tower top. The water in the storage tank is 133 ℃ saturated water, the saturated water is sent into the first cooler through a circulating pump (not shown in the figure), the saturated water absorbs phase change heat of the toluene tower top steam, the phase change heat is evaporated into 133 ℃ water vapor, the water vapor enters a compressor for compression and temperature rise, the water vapor pressure at the outlet of the compressor is 415kPa, the temperature is 145 ℃, the water vapor enters a benzene tower reboiler for heat exchange with tower bottom liquid of a benzene tower and is condensed into 145 ℃ water, and the condensed water enters the second cooler for further cooling to 133 ℃ water and returns to the storage tank.
Because toluene is easy to liquefy and is not suitable to be directly compressed in a compressor, water is selected as a heat transfer medium to recover the heat at the top of the toluene tower to heat the bottom of the benzene tower.
Comparative example 1
An energy-saving aromatic hydrocarbon extracting apparatus is composed of reformed oil fractionating tower, benzene tower and toluene tower, the first cooler with water inlet and outlet connected to the water inlet and outlet of circulated cooling water, the reboiler of benzene tower heated by steam, no compressor, storage tank and the second cooler. The rest is the same as in example 1.
75000kg/h of overhead vapor of the toluene column was condensed in the first cooler and then cooled in the second cooler to 135 deg.C. Wherein 56000kg/h of the tower top liquid is taken out as a product, and the rest is refluxed to the top of the toluene tower. Reboilers of the reformate fractionator, benzene column and toluene column are all heated with steam.
In comparison with the operating costs of example 1: (depending on the particular situation at the site of the installation,according to the steam price of 150 yuan/ton, the electricity price of 0.8 yuan/degree and the cooling water price of 0.2 yuan/m3Running every year 8000 hours for calculation)
Through calculation, compared with the prior art, the aromatic hydrocarbon extraction device can save about 62 percent of production operation cost, the investment cost of the devices such as the increased compressor and the like can be recovered within 1-2 years, and the method meets the requirement of environmental protection, and is safe, reliable and energy-saving.
The invention has been described above by way of example, and it should be noted that any simple variants, modifications or other equivalent substitutions by a person skilled in the art without spending creative effort may fall within the scope of protection of the present invention without departing from the core of the present invention.
Claims (5)
1. An energy-saving aromatic hydrocarbon extraction device is characterized by comprising a reformate fractionating tower, a benzene tower and a toluene tower, wherein a tower top production pipeline of the reformate fractionating tower is connected with a feed inlet of the benzene tower, a tower bottom production pipeline of the benzene tower is connected with a feed inlet of the toluene tower, a tower top steam outlet of the toluene tower is connected with a material inlet of a first cooler, a material outlet of the first cooler is connected with an inlet of a recooler, a first material outlet of the recooler is connected with a reflux inlet of the toluene tower, and a second material outlet of the recooler is a production outlet; the outlet of a storage tank for storing the heat exchange working medium is connected with the refrigerant inlet of the first cooler, the refrigerant outlet of the first cooler is connected with the inlet of a compressor, the outlet of the compressor is connected with the heat source inlet of the benzene tower reboiler, and the heat source outlet of the benzene tower reboiler is connected with the inlet of the storage tank.
2. The energy-saving aromatic hydrocarbon extraction device according to claim 1, wherein the heat exchange working medium is water.
3. The energy-saving aromatics extraction plant of claim 2, wherein a second cooler is disposed between the outlet of the reboiler heat source of the toluene column and the storage tank, and the refrigerant of the second cooler is circulating cooling water.
4. An energy efficient aromatics extraction plant as claimed in claim 3, wherein the first cooler and reboiler are in the form of a horizontal tube falling film.
5. The energy-saving aromatic hydrocarbon extraction device as claimed in claim 4, wherein the compressor is a twin-screw compressor, a roots compressor or a centrifugal compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121645403.3U CN214327643U (en) | 2021-07-20 | 2021-07-20 | Energy-saving aromatic hydrocarbon extraction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121645403.3U CN214327643U (en) | 2021-07-20 | 2021-07-20 | Energy-saving aromatic hydrocarbon extraction device |
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| Publication Number | Publication Date |
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| CN214327643U true CN214327643U (en) | 2021-10-01 |
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| CN202121645403.3U Active CN214327643U (en) | 2021-07-20 | 2021-07-20 | Energy-saving aromatic hydrocarbon extraction device |
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| CN (1) | CN214327643U (en) |
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2021
- 2021-07-20 CN CN202121645403.3U patent/CN214327643U/en active Active
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