CN115814458A - Enhanced extraction system and method for recovering edible oil from edible oil residues - Google Patents
Enhanced extraction system and method for recovering edible oil from edible oil residues Download PDFInfo
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- CN115814458A CN115814458A CN202211437464.XA CN202211437464A CN115814458A CN 115814458 A CN115814458 A CN 115814458A CN 202211437464 A CN202211437464 A CN 202211437464A CN 115814458 A CN115814458 A CN 115814458A
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- 238000000605 extraction Methods 0.000 title claims abstract description 81
- 239000008157 edible vegetable oil Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims description 10
- 239000003921 oil Substances 0.000 claims abstract description 62
- 239000007787 solid Substances 0.000 claims abstract description 59
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 238000000926 separation method Methods 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 238000005191 phase separation Methods 0.000 claims description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 5
- 239000013589 supplement Substances 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 4
- 230000005674 electromagnetic induction Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 claims description 2
- 239000000779 smoke Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 abstract description 22
- 235000019198 oils Nutrition 0.000 description 50
- 238000011084 recovery Methods 0.000 description 10
- 238000005265 energy consumption Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 238000010907 mechanical stirring Methods 0.000 description 7
- 239000012071 phase Substances 0.000 description 7
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000007790 solid phase Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 244000105624 Arachis hypogaea Species 0.000 description 1
- 235000010777 Arachis hypogaea Nutrition 0.000 description 1
- 235000018262 Arachis monticola Nutrition 0.000 description 1
- 240000002791 Brassica napus Species 0.000 description 1
- 235000004977 Brassica sinapistrum Nutrition 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 240000006240 Linum usitatissimum Species 0.000 description 1
- 235000004431 Linum usitatissimum Nutrition 0.000 description 1
- 244000000231 Sesamum indicum Species 0.000 description 1
- 235000003434 Sesamum indicum Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
- 235000012343 cottonseed oil Nutrition 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000004426 flaxseed Nutrition 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 235000020238 sunflower seed Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/74—Recovery of fats, fatty oils, fatty acids or other fatty substances, e.g. lanolin or waxes
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- Extraction Or Liquid Replacement (AREA)
- Fats And Perfumes (AREA)
Abstract
The invention relates to an integrated system for extracting and recovering edible oil from edible oil residues, which comprises an oil residue feeding unit, a mechanical mixer, a liquid-solid settling and separating unit, an internal circulation extracting unit, a two-phase separating unit, an edible oil collecting unit, an extractant and oil residue circulating unit and an oil residue circulating unit. The invention uses the mechanical mixer and the internal circulation extractor to carry out step-by-step mixing and extraction on the edible oil residue and the extracting agent, fully utilizes the mechanical mixing and the reinforced mixing mechanism of the internal circulation fluidized bed to realize high-efficiency edible oil extraction, adopts two-stage liquid-solid settling separation to improve the liquid-solid separation efficiency, adopts two-stage heating for the extracting agent and the edible oil separation unit, and ensures the temperature uniformity and the stability of the separation unit, thereby improving the separation efficiency.
Description
Technical Field
The invention relates to a system and a method for strengthening extraction of edible oil recovered from edible oil residues, in particular to a system and a method for strengthening extraction by internal circulation and separating an extracting agent from edible oil.
Background
China is an economic and large-population country, and grain and oil food is a traditional and dominant industry in China all the time, wherein the sales income of the grain and oil industry accounts for 2% of GDP in China, and the grain and oil safety is a basic industry which is related to the welfare of people and the economic development of China. In the grain and oil industry, the main raw materials are soybean, rapeseed, peanut, cottonseed, sunflower seed, sesame, linseed, etc. With the rapid development of the grain and oil industry, the disposal and utilization of oil residues, including the recovery of edible oil from the oil residues, are paid more and more attention, and the improper disposal and low-value utilization of the oil residues not only pollute the environment, but also waste resources and energy. The recovery of edible oil from oil residue is an important field of oil residue resource utilization, the main technical means at present is mechanical extrusion, the energy consumption is high, the oil yield is low, extraction and separation are common technologies in the field of oil product refining, but for the extraction and recovery of the edible oil from oil residue, the literature has few reports, especially the integrated technology of mechanical stirring and mixing and internal circulation enhanced extraction, and the literature at present has no report.
The development of an efficient oil residue disposal and resource utilization technology has important significance for reducing pollutant emission, reducing energy consumption and cost and improving economic and environmental benefits of grain and oil production enterprises.
Disclosure of Invention
The invention aims to solve the problem of edible oil recovery of edible oil residues, overcome the problems of low mechanical extrusion efficiency, high energy consumption, low grain and oil yield, high noise and the like, and provide an efficient oil residue disposal and resource utilization technology, in particular to a mechanical stirring mixing and internal circulation enhanced extraction integrated system and method, which optimize the process, improve the structural style, improve the oil quality, reduce the energy consumption and effectively reduce the pollutant emission.
The technical scheme for realizing the purpose of the invention is as follows: the invention relates to an enhanced extraction system and a method for recovering edible oil from edible oil residues, which comprises an oil residue feeding unit, a mechanical mixer, a liquid-solid settling unit, a liquid-solid separation unit, an internal circulation extraction unit, an extractant and edible oil two-phase separation unit, an edible oil collection unit, an extractant circulation unit and an oil residue circulation unit, wherein the oil residue feeding unit comprises a conveyor and a feeding bin, the extractant circulation unit comprises a circulation stream 1, an extractant supplement stream, a circulation stream 2 and an extractant circulation pump (22), the conveyor and the feeding bin of the oil residue feeding unit are communicated and connected, the feeding bin, the mechanical mixer and the circulation stream 2 are communicated and connected, the mechanical reboiler mixer, the liquid-solid settling unit, the oil residue circulation unit and the feeding bin are communicated and connected, the liquid-solid settling unit and the liquid-solid separation unit are communicated and connected, the liquid-solid settling unit, the liquid-solid separation unit (23) and the internal circulation extraction unit are communicated and connected through an internal circulation feeding pump, the liquid-solid separation unit and the internal circulation extraction unit are communicated and connected through a pipeline and a condenser, the internal circulation stream and the extraction unit, the liquid-solid separation unit and the extraction unit are communicated through a pipeline and a condenser.
A further optimized scheme is that the reinforced extraction system for recovering edible oil from edible oil residues comprises an internal circulation section, a settling section, an internal circulation extraction unit heating jacket and an internal circulation barrel, wherein the internal circulation barrel and the internal circulation section are coaxial and are arranged at the symmetrical position of a central line, the diameter of the internal circulation barrel is smaller than that of the internal circulation section, the heating medium of the heating jacket is water vapor, flue gas, electric heating, electromagnetic induction heating and microwave heating, and the diameter of the settling section is larger than that of the internal circulation section.
The further optimized scheme is that the reinforced extraction system for recovering the edible oil from the edible oil residues is characterized in that an internal circulation feed pump is communicated and connected with the bottom of an internal circulation section of an internal circulation extraction unit through a pipeline pipe fitting and is communicated and connected with the tops of a liquid-solid settling unit and a liquid-solid separation unit, an outlet pipe of the internal circulation feed pump enters the bottom of an internal circulation barrel at the bottom of the internal circulation extraction unit, the outlet pipe of the internal circulation feed pump is coaxial with the internal circulation barrel, and the outlet pipe of the internal circulation feed pump enters the bottom of the internal circulation barrel at the center line position of the internal circulation barrel.
The further optimized scheme is that the reinforced extraction system for recovering edible oil from edible oil residues is characterized in that the mechanical mixer is a single-screw, multi-screw or stirring kettle mixer, the mechanical mixer is communicated and connected with the oil residue circulation unit and the liquid-solid settling unit and is communicated and connected with the circulation stream 2 through a feeding bin, the mixture of the edible oil residues and the extracting agent is stirred and mixed by the mechanical mixer and is conveyed to the liquid-solid settling unit, the bottom of the liquid-solid settling unit is communicated and connected with the liquid-solid separation unit, and the bottom of the liquid-solid separation unit is communicated and connected with a solid output pipeline.
The further optimized scheme is that the reinforced extraction system for recovering the edible oil from the edible oil residues comprises a two-phase separation unit, an extraction separator, a two-phase separation unit feeding unit, a two-phase separation unit heating jacket, a reboiler and a condenser, wherein the two-phase separation unit feeding unit is a coil pipe or a coil pipe which extends into the extraction separator, the coil pipe or the coil pipe and the extraction separator are coaxially arranged, holes are formed in the coil pipe or the coil pipe, and heat sources of the two-phase separation unit heating jacket and the reboiler are steam, smoke, electric heating, electromagnetic induction heating and microwave heating.
The further optimized scheme is that the reinforced extraction system for recovering the edible oil from the edible oil residue is characterized in that the oil residue circulation unit is communicated and connected with the bottom of an internal circulation section of the internal circulation extraction unit and is also communicated and connected with the front end of a mechanical mixer, and the oil residue reflux pump is communicated and connected with the mechanical mixer through a pipeline pipe fitting and the internal circulation extraction unit.
The invention relates to a system and a method for integrating mechanical stirring, mixing and internal circulation enhanced extraction, which utilize the stirring, mixing and conveying functions of a mechanical mixer and the advantages of low energy consumption, simple operation and easy amplification to efficiently mix edible oil residues and an extracting agent, after liquid-solid separation, part of the oil residues carried by an oil phase are conveyed to an internal circulation extraction unit through an internal circulation feed pump, the oil residues enter an internal circulation cylinder at the central line position of the bottom of the internal circulation cylinder, the liquid-solid flows upwards from the internal circulation cylinder, the liquid-solid outside the internal circulation cylinder flows downwards to form a vigorously mixed internal circulation fluidized state, a heating jacket preheats the internal circulation extraction unit, the oil phase flows upwards gradually, the solid phase is gradually accumulated to the bottom of the internal circulation extraction unit and is reversely conveyed to the front end of the mechanical mixer by the oil residue reflux pump, the oil phase is further subjected to liquid-solid separation through the settling section, the solid phase is gradually settled, the light oil phase and the extracting agent are moved out from the top of the settling section, the oil phase and the extracting agent are conveyed into the two-phase separation unit, the reboiler heats the bottom of the two-phase separation unit, and the heating jacket heats the upper part of the two-phase separation unit to form an even temperature field.
The invention has the positive effects that:
(1) The system combines mechanical stirring, mixing and conveying and internal circulation fluidization enhanced extraction to realize step-by-step mixing and extraction and separation and recovery of an extracting agent and edible oil, has low energy consumption of mechanical stirring, mixing and conveying, simple operation and easy amplification, has good gas-solid mixing of an internal circulation fluidized bed, uniform bed layer temperature, good extraction effect and high system efficiency, and improves the edible oil recovery rate of oil residues, reduces pollutant emission, reduces energy consumption and improves economic and social benefits by step-by-step arrangement of mixers, optimization of extractor structures, circulation of the extracting agent, circulation and extraction of the oil residues and cascade utilization of energy.
(2) The invention adopts the internal circulating fluidized bed mixing extraction technology, liquid-solid mixture enters the bottom of the internal circulating extraction unit and enters the internal circulating cylinder from the bottom of the internal circulating cylinder along the central axis of the internal circulating cylinder, liquid-solid flow in the internal circulating cylinder flows upwards, liquid-solid flow moves downwards in the space outside the internal circulating cylinder to form turbulent flow for vigorously mixing liquid and solid, and the liquid-solid mixing and extraction efficiency is greatly promoted.
(3) The invention adopts an integrated technology of combining mechanical stirring and mixing and internal circulation enhanced mixing extraction to realize step-by-step mixing and extraction, and adopts the recycling of an extracting agent and the circulating extraction of oil residue, thereby improving the extraction efficiency, reducing the extraction cost and improving the recovery rate of the edible oil of the oil residue.
(4) The two-phase separation unit adopts a coil pipe or coil pipe feeding technology, is beneficial to the atomization of an extracting agent and edible oil, and improves liquid-liquid contact and heat and mass transfer. The separation efficiency of the extracting agent and the edible oil is improved, the upper section and the lower section are adopted for segmented heating, the lower section of heat source is from the reboiler, the upper section of heat source is from the heating jacket, the temperature is controllable, the separation efficiency and the product purity are controllable, and the product quality and the system efficiency are improved.
(5) The invention utilizes the energy cascade utilization technology, the temperatures of the reboiler, the heating jacket of the two-phase separation unit and the heating jacket of the internal circulation extraction unit are sequentially decreased, a heat source (such as steam) can enter the system from the reboiler, then the steam/hot water enters the heating jacket of the two-phase separation unit, and the condensed hot water then enters the heating jacket of the internal circulation extraction unit, thereby realizing the cascade utilization of energy, ensuring the temperature uniformity and gradient arrangement, and improving the product quality and the system thermal efficiency.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic structural view of the present invention;
reference numerals: 1. the system comprises an internal circulation extraction unit, 2, an internal circulation section, 3, a settling section, 4, an internal circulation extraction unit heating jacket, 5, an internal circulation cylinder, 6, a two-phase separation unit, 7, a two-phase separation unit feeding unit, 8, a two-phase separation unit heating jacket, 9, a reboiler, 10, an edible oil collecting unit, 11, an internal circulation feeding pump, 12, an oil residue reflux pump, 13, a mechanical mixer, 14, a liquid-solid settling unit, 15, a conveyor, 16, a feeding bin, 17, a circulation stream 1, 18, an extractant supplement stream, 19, a circulation stream 2, 20, an oil residue circulation unit, 21, a condenser, 22, an extractant circulation pump, 23, a liquid-solid separation unit, 24 and a solid output pipeline.
Detailed Description
(example 1)
Referring to fig. 1, the present invention provides an enhanced extraction system and method for recovering edible oil from edible oil residue, which comprises an oil residue feeding unit, a mechanical mixer 13, a liquid-solid settling unit 14, a liquid-solid separation unit 23, an internal circulation extraction unit 1, an extractant and edible oil two-phase separation unit, an edible oil collection unit 10, an extractant circulation unit, and an oil residue circulation unit 20, wherein the oil residue feeding unit comprises a conveyor 15 and a feeding bin 16, the oil residue is conveyed to the feeding bin 16 by the conveyor 15 and then enters the mechanical mixer 13, the present embodiment adopts single-screw stirring mixing conveying, the extractant recovered by the two-phase separation unit passes through a condenser 21, a circulation stream 1 and a circulation stream 2 and enters the feeding bin 16, the circulating extractant and the oil residue are mixed in the single-screw stirring mixer, the liquid-solid enters the liquid-solid settling unit 14 and then enters the liquid-solid separation unit 23, the solid is output by the liquid-solid separation unit 23, the liquid-solid mixture at the upper part of the liquid-solid settling unit 14 and the liquid-solid separation unit 23 are conveyed to the bottom of the internal circulation extraction unit 1 by an internal circulation pump, the internal circulation column 5 is fluidized, and the internal circulation stream 5 is formed by upward turbulent flow, and the turbulent flow is greatly improved.
In the embodiment, n-hexane is used as an extracting agent, solids accumulated at the bottom of the internal circulation extraction unit 1 are returned to the front end of the mechanical mixer 13 by the oil residue reflux pump 12, and raw oil residue, circulating oil residue, a circulating extracting agent and a fresh extracting agent from an extracting agent supplement stream 18 are mixed in the mechanical mixer 13, wherein an extracting agent circulating stream 2 is merged with a circulating stream 117 and the extracting agent supplement stream 18 and then directly enters the feeding bin 16, the flushing effect is provided for the raw oil residue in the feeding bin 16, the flowing of the raw oil residue and the conveying to the mechanical mixer 13 are promoted, the gathering of multi-phase streams in the mechanical mixer 13 and the mechanical stirring and mixing conveying function of a screw are improved, and the liquid-solid mixing and extracting efficiency are improved.
After the upper part of the internal circulation extraction unit 1 is settled by the settling section 3, the upper liquid phase is purified, the solid phase tends to settle, a heating jacket 4 of the internal circulation extraction unit is preheated to 50-60 ℃ by hot water, the hot water comes from a heating jacket 8 of the two-phase separation unit, the hot water/steam of the heating jacket 8 of the two-phase separation unit comes from a reboiler 9 of the two-phase separation unit, a normal hexane circulation stream 1 flowing out of the top of the two-phase separation unit 6 is condensed by a condenser 21, and the temperature is regulated to 20-30 ℃, so that the recovery rate of normal hexane is ensured, the mixing temperature of a mechanical mixer 13 is also ensured, the preheating of the internal circulation extraction unit 1 promotes the floating of the oil phase of light components and the settling of the solid phase, the liquid-solid separation efficiency is improved, the energy gradient utilization technology reduces the energy consumption, and the recovery rate of edible oil and the system efficiency are improved.
The liquid phase which is discharged from the top of the settling section 3 enters a two-phase separation unit feeding unit 7, the two-phase separation unit feeding unit 7 is a transverse coil which extends into the two-phase separation unit 6, the coil and the two-phase separation unit 6 are coaxially arranged, holes are formed in the coil, the aperture is 2mm, and the liquid phase is sprayed out through the aperture of 2mm to form an atomization state, so that liquid-liquid mixing and mass and heat transfer are promoted, and the extraction efficiency is improved; the two-phase separation unit 6 adopts an upper section and a lower section for heating, the lower section adopts the reboiler 9 for providing a heat source, the low-pressure steam is adopted for providing heat for the reboiler in the embodiment, the upper section is heated by the heating jacket, the heating medium is hot water output from the reboiler 9, the temperature of the upper section is controlled at 70 ℃, the temperature of the lower section is controlled at 75-80 ℃, the temperature uniformity and stability are improved, the recovery rate of normal hexane and edible oil is improved, the pollutant discharge is reduced, and the system energy consumption is reduced.
(example 2)
The mechanical mixer (13) adopts a double-screw structure, the extracting agent adopts petroleum ether, the upper section of the two-phase separation unit 6 is controlled at 80-85 ℃, the lower section is controlled at 90-95 ℃, the feeding unit of the two-phase separation unit is a vertical coil, the aperture on the coil is 3mm, and the rest is the same as that in the embodiment 1.
(example 3)
The mechanical mixer (13) adopts a stirring kettle structure, and the extracting agent adopts normal hexane, and the rest is the same as that of the embodiment 1.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An enhanced extraction system and method for recovering edible oil from edible oil residues are characterized in that: the oil residue extraction device comprises an oil residue feeding unit, a mechanical mixer (13), a liquid-solid settling unit (14), a liquid-solid separation unit (23), an internal circulation extraction unit (1), an extractant and edible oil two-phase separation unit, an edible oil collection unit (10), an extractant circulation unit and an oil residue circulation unit (20), wherein the oil residue feeding unit comprises a conveyor (15) and a feeding bin (16), the extractant circulation unit comprises a circulation stream 1 (17), an extractant supplement stream (18), a circulation stream 2 (19) and an extractant circulation pump (22), the conveyor (15) and the feeding bin (16) of the oil residue feeding unit are communicated and connected, the feeding bin (16) and the mechanical mixer (13) and the circulation stream 2 (19) are communicated and connected, the mechanical mixer (13) and the liquid-solid settling unit (14), the oil residue circulation unit (20) and the feeding bin (16) are communicated and connected, the liquid-solid settling unit (14) and the liquid-solid separation unit (23) are communicated with the internal circulation unit (11) and the extraction unit (1) through an internal circulation pipeline (24), and the extraction unit (13) and the internal circulation pump (24), and the extraction unit (13) are communicated and the extraction unit (24), and the internal circulation pump (13) and the extraction unit (24), and the extraction unit (13) are communicated and the internal circulation pump, the liquid-solid settling unit (14) and the liquid-solid separation unit (23) are communicated and connected, the two-phase separation unit is communicated and connected with the reboiler (9), the condenser (21) and the internal circulation extraction unit (1) through pipeline pipes, the reboiler (9) is communicated and connected with the edible oil collection unit (10), and the condenser (21) is communicated and connected with the circulation stream 1 (17) and the two-phase separation unit.
2. The system for the enhanced extraction of the edible oil recovered from the edible oil residues as claimed in claim 1, wherein: the inner circulation extraction unit (1) comprises an inner circulation section (2), a settling section (3), an inner circulation extraction unit heating jacket (4) and an inner circulation barrel (5), wherein the inner circulation barrel (5) and the inner circulation section (2) are coaxial and are arranged at the symmetrical positions of a central line, the diameter of the inner circulation barrel (5) is smaller than that of the inner circulation section (2), a heating medium of the two-phase separation unit heating jacket (4) is water vapor, smoke, electric heating, electromagnetic induction heating and microwave heating, and the diameter of the settling section (3) is larger than that of the inner circulation section (2).
3. The system for the enhanced extraction of the edible oil recovered from the edible oil residues as claimed in claim 1, wherein: the internal circulation feed pump (11) is communicated and connected with the bottom of the internal circulation section (2) of the internal circulation extraction unit (1) through a pipeline pipe fitting, and is communicated and connected with the top of the liquid-solid settling unit (14) and the top of the liquid-solid separation unit (23), the outlet pipe of the internal circulation feed pump (11) enters the bottom of the internal circulation cylinder (5) at the bottom of the internal circulation extraction unit (1), the outlet pipe of the internal circulation feed pump (11) is coaxial with the internal circulation cylinder (5), and the outlet pipe of the internal circulation feed pump (11) enters the bottom of the internal circulation cylinder (5) at the center line position of the internal circulation cylinder (5).
4. The system for the enhanced extraction of the edible oil recovered from the edible oil residues as claimed in claim 1, wherein: the mechanical mixer (13) is a single-screw, multi-screw or stirring kettle mixer, is communicated and connected with the oil residue circulating unit (20) and the liquid-solid settling unit (14) and is communicated and connected with the circulating stream 2 (19) through the feeding bin (16), the mixture of the edible oil residue and the extracting agent is stirred, mixed and conveyed to the liquid-solid settling unit (14) through the mechanical mixer (13), the bottom of the liquid-solid settling unit (14) is communicated and connected with the liquid-solid separating unit (23), and the bottom of the liquid-solid separating unit (23) is communicated and connected with the solid output pipeline (24).
5. The system for the enhanced extraction of the edible oil recovered from the edible oil residues as claimed in claim 1, wherein: the two-phase separation unit comprises an extraction separator (6), a two-phase separation unit feeding unit (7), a two-phase separation unit heating jacket (8), a reboiler (9) and a condenser (21), wherein the two-phase separation unit feeding unit (7) is a coil pipe or a coil pipe which extends into the extraction separator (6), the coil pipe or the coil pipe and the extraction separator (6) are coaxially arranged, holes are formed in the coil pipe or the coil pipe, and heat sources of the two-phase separation unit heating jacket (8) and the reboiler (9) are steam, flue gas, electric heating, electromagnetic induction heating and microwave heating.
6. The system for enhanced extraction of edible oil from edible oil residue according to claim 1, wherein the system comprises: the oil residue circulation unit (20) is communicated and connected with the bottom of the internal circulation section (2) of the internal circulation extraction unit (1) and is also communicated and connected with the front end of the mechanical mixer (13), and the oil residue reflux pump (12) is communicated and connected with the mechanical mixer (13) through a pipeline and a pipe fitting and the internal circulation extraction unit (1).
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