Supercritical edible oil extraction system

Abstract

The invention discloses a supercritical edible oil extraction system, and belongs to the field of edible oil extraction, the supercritical edible oil extraction system comprises a support frame, a separation kettle is fixedly installed on the support frame, a placing assembly is arranged in the separation kettle, a driving assembly is arranged in the separation kettle, and a temperature adjusting assembly is arranged in the separation kettle. The driving assembly comprises a servo motor fixedly installed on the separation kettle, a rotating shaft is fixedly installed at the driving end of the servo motor, and a connecting piece is fixedly installed on the rotating shaft. When the content of carbon dioxide gas generated in the separation kettle is too low, through cooperation of the pressure regulating assembly and the temperature regulating assembly, the separation speed of carbon dioxide and grease is increased, the separation effect of the carbon dioxide and the grease is ensured, meanwhile, if the content of the carbon dioxide gas is too high, the air draft speed of the multiple fan blades in the stage can be adaptively increased, and the efficiency is improved. And the purity of the recovered gas can be effectively ensured while the recovery rate of the gas in the separation kettle is ensured.

Description

Technical Field

[0001] The invention relates to the field of edible oil extraction, and more specifically to a supercritical edible oil extraction system. Background Art

[0002] Traditional edible oil extraction methods usually use leaching and pressing methods, but most of these methods have problems such as low oil yield and easy loss of nutrients. Therefore, with the continuous development of extraction technology, supercritical fluid extraction technology has gradually been widely promoted and applied through its outstanding advantages of efficient extraction of edible oil and effective maintenance of edible oil nutrition and quality during the extraction process.

[0003] In the process of extracting edible oil using supercritical fluid technology, supercritical carbon dioxide can effectively dissolve various components in edible oil under specific temperature and pressure conditions. The fluid obtained in this process is usually called "supercritical carbon dioxide fluid". Then, by changing the temperature and pressure of the separation equipment, the oil and carbon dioxide in the "supercritical carbon dioxide fluid" can be separated to complete the extraction of edible oil.

[0004] However, existing separation equipment usually sets the temperature and pressure inside the container to constant values. Different types of oils and fats require different temperatures and pressures for separation from carbon dioxide, and carbon dioxide exhibits different phases at different temperatures and pressures. This can easily lead to incomplete separation of carbon dioxide and oil in the "supercritical carbon dioxide fluid" at constant temperature and pressure. This incomplete separation will not only reduce the quality of the final oil, but also reduce the purity of the final recycled and reused carbon dioxide. Therefore, there is an urgent need to design a supercritical edible oil extraction system to solve the above problems. Summary of the invention

[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a supercritical edible oil extraction system.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A supercritical edible oil extraction system comprises a support frame, a separation kettle is fixedly mounted on the support frame, a placement component is arranged in the separation kettle, a driving component is arranged in the separation kettle, and a temperature adjustment component is arranged in the separation kettle;

[0008] The driving assembly includes a servo motor fixedly mounted on the separation kettle, a rotating shaft is fixedly mounted on the driving end of the servo motor, a fixing frame is fixedly mounted on the rotating shaft, a fixing ring is fixedly mounted on the fixing frame, a sealing ring is fixedly mounted on the fixing ring, and the sealing ring is sealingly rotatably mounted in the separation kettle, an exhaust assembly is arranged on the sealing ring, a carbon dioxide sensor is fixedly mounted on the fixing ring, a speed regulating assembly is arranged on the fixing ring, and a pressure regulating assembly is arranged on the fixing ring.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] (1) In the present scheme, during the separation process of the "supercritical carbon dioxide fluid" inside the separation kettle, the gas generated inside the separation kettle can be extracted in time through the cooperation of the speed regulating component and the exhaust component, which not only effectively improves the efficiency of recovering carbon dioxide gas in the gas storage tank, but also effectively reduces the contact time between grease or other impurities in the separation kettle and the gaseous carbon dioxide, which helps to improve the purity of the recovered and reused carbon dioxide gas. The recovered carbon dioxide gas can be filtered through the non-polar membrane, which helps to further improve the purity of the carbon dioxide gas recovered in the gas storage tank and ensure the subsequent extraction effect of the recycled carbon dioxide on oil.

[0011] (2) When the carbon dioxide sensor detects that the carbon dioxide concentration inside the separation kettle is low, this solution increases the separation speed of carbon dioxide and oil in the "supercritical carbon dioxide fluid" by coordinating the speed regulating component with the temperature regulating component and the pressure regulating component to ensure the separation effect of the two. At the same time, by coordinating the speed regulating component with the exhaust component, the speed of the exhaust of multiple fan blades at this stage can be effectively reduced, which helps to prevent the pressure inside the separation kettle from being too low, resulting in rapid gasification of carbon dioxide and insufficient separation from oil.

[0012] (3) When the carbon dioxide sensor detects that the carbon dioxide concentration inside the separation kettle is too high, this solution can effectively increase the speed of the multiple fan blades in coordination with the exhaust component at this stage through the cooperation of the speed control component and the exhaust component, thereby ensuring the timely recovery of the carbon dioxide gas generated inside the separation kettle. At the same time, it can also effectively reduce the safety accidents caused by the continuous increase in the internal pressure of the separation kettle. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention;

[0014] Figure 2 for Figure 1 The structural diagram of the separation kettle;

[0015] Figure 3 for Figure 2 Schematic diagram of the middle section;

[0016] Figure 4 for Figure 2 A cross-sectional schematic diagram of the separation kettle after being rotated at a certain angle;

[0017] Figure 5 for Figure 3 A schematic diagram of the structure of the internal components of the separation kettle;

[0018] Figure 6 for Figure 5 Schematic diagram of the connection structure between the servo motor, the fixing ring and the sealing ring;

[0019] Figure 7 for Figure 5 Schematic diagram of the structure of components on the middle fixed ring;

[0020] Figure 8 for Figure 7 Schematic diagram of the local structure after the middle fixing ring is turned over;

[0021] Fig. 9 for Figure 8 Structural diagram of the middle speed regulating mechanism;

[0022] Fig.10 for Fig. 9 A schematic diagram of the structure of the push component;

[0023] Fig.11 for Fig.10 A schematic diagram of the structure after removing the support plate and the electric telescopic rod;

[0024] Fig.12 for Figure 6 A cross-sectional view of the middle fixing ring and the sealing ring after they are rotated by a certain angle;

[0025] Fig.13 for Fig.12 A schematic diagram of the structure of the central exhaust assembly;

[0026] Fig.14 for Fig.13 Schematic diagram of the components structure on the middle round roller;

[0027] Fig.15 for Fig.14 A cross-sectional view of the middle push plate and the slider after they are rotated to a certain angle;

[0028] Fig.16 for Fig.13 A schematic diagram of the structure after multiple fan blades rotate at a certain angle;

[0029] Fig.17 for Figure 5 A schematic cross-sectional view of the middle fixing ring;

[0030] Fig.18 for Figure 1A partial cross-sectional schematic diagram of the separation kettle;

[0031] Fig.19 for Fig.17 Structural diagram of the middle voltage regulating assembly;

[0032] Fig. 20 for Fig.19 Schematic diagram of the structure after removing the one-way exhaust duct.

[0033] Description of the numbers in the figure:

[0034] 1. Support frame; 2. Gas storage tank; 3. Pressurizing equipment; 4. Extraction kettle; 5. Separation kettle;

[0035] 6. Recovery assembly; 61. Conduit; 62. Air return pipe; 63. Recovery cylinder;

[0036] 7. Placement component; 71. Cavity; 72. Groove; 73. Placement slot;

[0037] 8. Driving assembly; 81. Servo motor; 82. Rotating shaft; 83. Fixed frame; 84. Fixed ring; 85. Sealing ring; 86. Carbon dioxide sensor;

[0038] 9. Speed ​​regulating assembly; 91. Rotating shaft; 92. Rotating gear; 93. Ring rack; 94. Rotating rod; 95. Pulley 1; 96. Steel belt; 97. Pulley 2; 98. Bevel gear 1; 99. Support plate; 910. Limiting opening; 911. Electric telescopic rod; 912. Push rod; 913. Active connecting piece 1; 914. Active connecting piece 2; 915. Fixed piece; 916. Push piece 1; 917. Push piece 2;

[0039] 10. Exhaust assembly; 101. Electrodeless membrane; 102. Round roller; 103. Conveyor belt; 104. Shaft; 105. Eccentric wheel; 106. Spring rod; 107. Push plate; 108. Sleeve; 109. Slider; 110. Round rod; 111. Fan blade; 112. Block; 113. Slide; 114. Pusher; 115. Moving plate; 116. Slide groove;

[0040] 11. Sealing ring;

[0041] 12. Temperature adjustment component; 121. Sealing ring; 122. Fixing rod; 123. Drain port;

[0042] 13. Pressure regulating assembly; 131. One-way exhaust duct; 132. Transmission rod; 133. Fan; 134. Push rod; 135. Adjustment rod; 136. Block; 137. Fixed plate; 138. Straight plate; 139. Limiting frame; 1310. Air bag; 1311. Plate body. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0044] See also Figures 1 to 20 A supercritical edible oil extraction system comprises a support frame 1, a separation kettle 5 is fixedly mounted on the support frame 1, a placement component 7 is arranged in the separation kettle 5, a driving component 8 is arranged in the separation kettle 5, and a temperature adjustment component 12 is arranged in the separation kettle 5;

[0045] The driving assembly 8 includes a servo motor 81 fixedly mounted on the separation kettle 5, a rotating shaft 82 is fixedly mounted on the driving end of the servo motor 81, a fixing frame 83 is fixedly mounted on the rotating shaft 82, a fixing ring 84 is fixedly mounted on the fixing frame 83, a sealing ring 85 is fixedly mounted on the fixing ring 84, and the sealing ring 85 is sealingly rotatably mounted in the separation kettle 5, an exhaust assembly 10 is arranged on the sealing ring 85, a carbon dioxide sensor 86 is fixedly mounted on the fixing ring 84, a speed regulating assembly 9 is arranged on the fixing ring 84, and a pressure regulating assembly 13 is arranged on the fixing ring 84;

[0046] The speed regulating assembly 9 includes a rotating shaft 91 rotatably mounted on the lower end of the fixed ring 84, a rotating rod 94 is passed through and rotatably mounted on the fixed ring 84, and a speed regulating mechanism is fixedly mounted between the rotating shaft 91 and the rotating rod 94;

[0047] The pressure regulating assembly 13 includes a one-way exhaust pipe 131 fixedly installed on the upper end of the fixing ring 84, a support block is fixedly installed in the one-way exhaust pipe 131, a transmission rod 132 passes through and is slidably installed on the support block, a transmission component is installed between the transmission rod 132 and the rotating rod 94, and an adjustment component is installed between the transmission rod 132 and the fixing ring 84.

[0048] like Figure 1 As shown, the separation kettle 5 is provided with a recovery assembly 6, which includes a recovery cylinder 63 fixedly mounted on the support frame 1, and a drain pipe is fixedly connected between the recovery cylinder 63 and the separation kettle 5, a gas storage tank 2 is fixedly mounted on the support frame 1 (the gas stored in the gas storage tank 2 is carbon dioxide), an extraction kettle 4 is fixedly mounted on the support frame 1, and a gas transmission pipe (drawn but not marked in the figure, from the gas storage tank 2 to the extraction kettle 4) is fixedly connected between the gas storage tank 2 and the extraction kettle 4. Figure 1 As can be seen in the figure, a pressurizing device 3 is fixedly installed on the gas transmission pipe, a conduit 61 is fixedly connected between the extraction kettle 4 and the separation kettle 5, and a return gas pipe 62 is fixedly connected between the gas storage tank 2 and the separation kettle 5.

[0049] When the device is used to extract edible oil, the oil after pretreatment (such as cleaning, drying, crushing, etc. according to the type of oil selected) is first input into the extraction kettle 4, and then the pressurizing device 3 is started, and the two valves on the gas pipeline are opened (from Figure 1 As can be seen in the figure, two valves are installed on the gas pipeline and the conduit 61. The operation of the pressurizing device 3 can pressurize and heat the carbon dioxide flowing through the gas pipeline to form "supercritical carbon dioxide".

[0050] "Supercritical carbon dioxide" means that carbon dioxide is in a supercritical state. When the temperature and pressure exceed the critical temperature and critical pressure of carbon dioxide, carbon dioxide will enter a supercritical state. In this state, carbon dioxide has both gas-like diffusivity and low viscosity, and liquid-like high density and strong solubility. It can effectively dissolve oils in oil. At the same time, by changing the temperature and pressure, the solubility of supercritical carbon dioxide can be changed, thereby achieving selective extraction of different components in oil.

[0051] In addition, "supercritical carbon dioxide" is a non-toxic, odorless, non-combustible fluid that will not leave harmful residues during the extraction of edible oil. At the same time, "supercritical carbon dioxide" can be used at a relatively low temperature during the extraction of edible oil, effectively avoiding the destruction of heat-sensitive components in the edible oil by high temperature, which helps to improve the nutrition and quality of the extracted edible oil.

[0052] When the "supercritical carbon dioxide" enters the extraction kettle 4, it will begin to mix with the oil inside the extraction kettle 4. When the "supercritical carbon dioxide" inside the extraction kettle 4 is fully mixed with the oil, the fat in the oil is fully dissolved, and the "supercritical carbon dioxide fluid" is generated inside the extraction kettle 4, the temperature and pressure in the separation kettle 5 can be adaptively adjusted by cooperating with the temperature regulating component 12 and the existing pressure regulating equipment (under specific pressure and temperature, the carbon dioxide and fat in the "supercritical carbon dioxide fluid" will be effectively separated, and the "supercritical carbon dioxide fluid" composed of different fats and fats has different temperatures and pressures to separate carbon dioxide and fats. Therefore, the temperature and pressure inside the separation kettle 5 need to be adjusted according to the type of extracted fat), and then the two valves on the conduit 61 are opened to allow the "supercritical carbon dioxide fluid" to enter the separation kettle 5 along the conduit 61.

[0053] like Figure 1 - Fig.16 As shown, the placement assembly 7 includes a cavity 71 opened in the separation kettle 5 , a groove 72 communicating with the cavity 71 is opened in the separation kettle 5 , and a placement groove 73 is opened in the separation kettle 5 .

[0054] The speed regulating mechanism includes a rotating gear 92 fixedly mounted on a rotating shaft 91, a ring rack 93 meshing with the rotating gear 92 is fixedly mounted on the placement groove 73, a pulley 95 is slidably mounted on the rotating shaft 91, and two pulleys 95 are provided, a pulley 2 97 is slidably mounted on the rotating rod 94, and two pulleys 97 are provided, a steel belt 96 is jointly sleeved and installed between the two pulleys 1 95 and the two pulleys 2 97, and a pushing component is installed on the fixed ring 84.

[0055] The push component includes a support plate 99 fixedly mounted on the lower end of the fixed ring 84, an electric telescopic rod 911 is fixedly mounted on the support plate 99, a push rod 912 is fixedly mounted on the electric telescopic rod 911, a limited opening 910 is provided on the support plate 99, two limited openings 910 are provided, a fixing member 915 is slidably mounted on the right limited opening 910, two fixing members 915 are provided, and the two fixing members 915 are rotatably connected to the corresponding pulley 95, and a movable connecting member 913 is installed between the two fixing members 915 and the push rod 912, and a push member 916 is slidably mounted on the left limited opening 910 (the left and right here refer to Fig.10 , Fig.10 The position of the electric telescopic rod 911 in the figure is the left side, and the position of the push piece 1 916 in the figure is the right side), a push piece 2 917 is slidably installed on the left limit opening 910, and the push piece 1 916 and the push piece 2 917 are both rotatably connected to the corresponding pulley 2 97, and a movable connecting piece 2 914 is installed between the push rod 912 and the push piece 1 916 and the push piece 2 917.

[0056] The air extraction assembly 10 includes a vent hole (shown but not labeled) formed on the sealing ring 85. Fig.12 It can be seen in the figure), and one end of the one-way exhaust pipe 131 is sealed and penetrates the sealing ring 85 and extends into the ventilation hole, an electrodeless membrane 101 is fixedly installed in the ventilation hole, a positioning plate is fixedly installed in the ventilation hole, a round roller 102 is penetrated and rotatably installed on the positioning plate, a sleeve 108 is slidably installed on the round roller 102, and a circular rod 110 evenly distributed in an annular shape is fixedly installed on the sleeve 108, and fan blades 111 are rotatably installed on the round rod 110;

[0057] The sleeve 108 is provided with sliding grooves 116 which are evenly distributed in an annular shape, and movable plates 115 are slidably installed on the sliding grooves 116. Slide blocks 109 are fixedly installed between the movable plates 115. Blocks 112 which are evenly distributed in an annular shape are fixedly installed on the slide blocks 109. The blocks 112 are provided with sliding grooves 113. Pushing members 114 are slidably installed on the sliding grooves 113, and the pushing members 114 are fixedly connected to the corresponding fan blades 111. A driving component is installed between the round roller 102 and the rotating rod 94.

[0058] The driving component includes a bevel gear 1 98 fixedly mounted on the rotating rod 94, a bevel gear 2 meshing with the bevel gear 1 98 fixedly mounted on the round roller 102, a shaft 104 rotatably mounted in the ventilation hole, rotating wheels fixedly mounted on the rotating rod 94 and the shaft 104, a conveyor belt 103 is sleeved and mounted between the two rotating wheels, and an eccentric wheel 105 is fixedly mounted on the shaft 104;

[0059] A vertical plate is fixedly installed on the ventilation hole, and there are two vertical plates. A spring rod 106 is fixedly installed on the two vertical plates. A push plate 107 is fixedly installed between the two spring rods 106. The push plate 107 is provided with an annular groove, and spheres evenly distributed in an annular shape are slidably installed on the annular groove, and the spheres are fixedly connected to the slider 109.

[0060] When the "supercritical carbon dioxide fluid" enters the separation kettle 5, the lower pressure inside the separation kettle 5 will cause the carbon dioxide in the "supercritical carbon dioxide fluid" to gasify, reducing its ability to dissolve oils and fats, causing the oils and carbon dioxide in the "supercritical carbon dioxide fluid" to gradually separate (in the supercritical state, the distance between carbon dioxide molecules is smaller than that in the liquid state, but tighter than the gas state. At this time, carbon dioxide has a certain dissolving and wrapping ability for oils and fats. As the pressure drops, when the pressure inside the separation kettle 5 is lower than the saturated vapor pressure of carbon dioxide, the carbon dioxide will change from a supercritical fluid to a gas).

[0061] When the amount of carbon dioxide gas collected inside the separation kettle 5 gradually increases, the carbon dioxide sensor 86 and the servo motor 81 are started. The operation of the carbon dioxide sensor 86 can accurately detect the carbon dioxide concentration inside the separation kettle 5, and the operation of the servo motor 81 can drive the fixing ring 84, the carbon dioxide sensor 86 and the sealing ring 85 to rotate together through the cooperation of the rotating shaft 82 and the fixing frame 83, so that the carbon dioxide sensor 86 can achieve uniform detection of the carbon dioxide gas concentration inside the separation kettle 5, which helps to improve the accuracy of the detection result.

[0062] When the carbon dioxide sensor 86 is working, the infrared light source inside the sensor will emit infrared light. When the carbon dioxide gas flows through the carbon dioxide sensor 86, the molecules in the carbon dioxide gas will absorb infrared light of a specific wavelength, causing the light intensity to change. The carbon dioxide sensor 86 can detect the change in the intensity of the infrared light after the gas absorbs it, and thus obtain the concentration of the carbon dioxide gas inside the separation kettle 5 (the concentration of carbon dioxide can indirectly reflect the content of carbon dioxide gas). The specific working principle and internal structure of the carbon dioxide sensor 86 are existing mature technologies and will not be further elaborated here.

[0063] At the same time, when the fixed ring 84 is driven by the force to drive the carbon dioxide sensor 86 to rotate, the rotating shaft 91, the rotating rod 94 and the rotating gear 92 will also rotate together. During the rotation of the rotating gear 92, through the cooperation with the annular rack 93, the rotating shaft 91 can rotate while rotating, and through the cooperation of the two pulleys 1 95, the two pulleys 2 97 and the steel belt 96, the rotating rod 94 can rotate together with the rotating shaft 91 (from Fig. 9 It can be seen that in the initial state, the distance between the two pulleys 95 is equal to the distance between the two pulleys 97, and the contact area between the steel belt 96 and the two pulleys 95 and the two pulleys 97 is equal. Therefore, in the initial state, the rotation speed of the rotating shaft 91 and the rotating rod 94 is the same).

[0064] While the rotating rod 94 is rotated by force, the bevel gear 1 98 and the bevel gear 2 cooperate to drive the round roller 102 to rotate together. When the round roller 102 rotates, the sleeve 108 cooperates with the multiple round rods 110 to make the multiple fan blades 111 rotate to suck the carbon dioxide gas inside the separation kettle 5 into the ventilation hole, and finally flows into the gas return pipe 62 and enters the gas storage tank 2 for storage (from Figure 3 It can be seen that there is a certain gap between the left side of the sealing ring 85 and the separation kettle 5. When multiple fan blades 111 cooperate to suck the gas inside the separation kettle 5 into the ventilation hole, the gas will first enter the gap between the sealing ring 85 and the separation kettle 5, and then flow into the return air pipe 62).

[0065] And when the carbon dioxide gas inside the ventilation hole flows into the return air pipe 62, the non-polar membrane 101 inside the ventilation hole can filter the carbon dioxide gas flowing through (the carbon dioxide gas separated from the "supercritical carbon dioxide fluid" will gradually accumulate a small amount of impurities such as oil, pigment, etc. in the process of recycling, gradually reducing the purity of the carbon dioxide gas, and thus reducing the subsequent carbon dioxide cycle pressurization and heating. The extraction effect on the oil). This can help ensure the effect of carbon dioxide gas on oil extraction during the recycling process through the cooperation of the pressurizing equipment 3.

[0066] Moreover, by cooperating with a plurality of fan blades 111 to extract the carbon dioxide gas inside the separation kettle 5, the recovery efficiency of the carbon dioxide gas generated inside the separation kettle 5 can be effectively improved, while ensuring the stability of the internal pressure of the separation kettle 5 (when the carbon dioxide gas inside the separation kettle 5 gradually increases, the internal pressure will also increase accordingly. If the gas generated inside the separation kettle 5 is not discharged in time, the separation effect of the "supercritical carbon dioxide fluid" inside the separation kettle 5 will gradually decrease). In addition, by cooperating with a plurality of fan blades 111, the timeliness of extracting the gas inside the separation kettle 5 can be effectively reduced, thereby effectively reducing the contact time between grease or other impurities and gaseous carbon dioxide and reducing the probability of their mixing with gaseous carbon dioxide, thereby helping to improve the purity of the carbon dioxide gas recovered from the gas storage tank 2.

[0067] The electrodeless membrane 101 can be specifically made of a hydrophobic material, such as a polytetrafluoroethylene material. Since oils are usually hydrophobic and have similar surface properties to those of hydrophobic materials, hydrophobic materials have a natural repulsive effect on oil molecules, and oils are not easily adsorbed and penetrated on the surface of the electrodeless membrane 101 made of hydrophobic materials. At the same time, the electrodeless membrane 101 made of hydrophobic materials can effectively ensure its effect on filtering oils and fats in carbon dioxide gas during long-term use, as well as maintain the air permeability of the membrane, and can effectively avoid the situation in which the filtering performance of the electrodeless membrane 101 is reduced due to factors such as water vapor (the carbon dioxide gas separated from the "supercritical carbon dioxide fluid" inside the separation kettle 5 usually contains a certain amount of water vapor).

[0068] At the same time, when the rotating rod 94 drives the round roller 102 to rotate, the two rotating wheels and the conveyor belt 103 cooperate to make the shaft 104 drive the eccentric wheel 105 to rotate together. During the rotation process of the eccentric wheel 105, the push plate 107 will first push the slider 109 to drive the multiple blocks 112 thereon to move to the left (such as Fig.14 When the blocks 112 move, the pushers 114 thereon slide in the corresponding slots 113 and exert a certain rotational thrust on the corresponding blades 111, so that the blades 111 rotate counterclockwise (as shown) with the corresponding round rods 110 as the axis. Fig.15 direction shown).

[0069] When the left side of the slider 109 contacts the left end of the sleeve 108, the plurality of blades 111 rotate and splice into a circular plate (such as Fig.16 In the state shown, and the diameter of the circular plate formed by the rotation and splicing of multiple fan blades 111 is only slightly smaller than the diameter of the ventilation hole), the push plate 107 will push the sleeve 108 to move together through the slider 109. At this time, the sleeve 108 drives the movement of the multiple fan blades 111, which can squeeze the carbon dioxide gas between the multiple fan blades 111 and the non-polar membrane 101, thereby helping to increase the filtering speed of the non-polar membrane 101 for the gas entering the ventilation hole, thereby ensuring the efficiency of the gas discharge from the separation kettle 5.

[0070] In order to ensure the filtering effect of the electrodeless membrane 101 on other impurities such as grease in the carbon dioxide gas, the pore size on the electrodeless membrane 101 is usually set between 5 and 10 nanometers. The squeezing of the carbon dioxide gas in the ventilation holes by the coordinated movement of multiple fan blades 111 can effectively increase the flow rate and kinetic energy of the gas, increase the speed of gas molecules passing through the electrodeless membrane 101, and increase its movement flow rate by squeezing the gas, which can also effectively reduce the residence time of impurities such as grease on the surface of the electrodeless membrane 101, reduce the deposition of impurities such as grease, and reduce the risk of contamination of the electrodeless membrane 101 (high-speed flowing gas can flush out impurity particles such as grease, which helps to improve the cleanliness of the electrodeless membrane 101).

[0071] When the thrust of the eccentric wheel 105 on the push plate 107 disappears, the push plate 107 drives the slider 109 to move to the right side and reset (such as Fig.14 In the process of the slider 109 moving to the right relative to the sleeve 108, the corresponding blades 111 can be pushed to rotate and reset through the cooperation of the multiple blocks 112 and the pusher 114. When the multiple blades 111 rotate and cooperate to extract the gas inside the separation kettle 5 again, the slider 109 just contacts the right end of the sleeve 108 (as shown in FIG. Fig.14 The movement of the push plate 107 will push the slider 109 and the sleeve 108 to move together and reset, and then repeat the above operation to achieve the effect of intermittent air intake and intermittent gas squeezing of multiple fan blades 111, thereby accelerating the filtering speed of carbon dioxide gas by the electrodeless membrane 101.

[0072] like Figure 7 - Fig. 20 As shown, the transmission component includes an adjusting rod 135 fixedly mounted on the lower end of the transmission rod 132, two adjusting rods 135 are provided, a block 136 cooperating with the rotating rod 94 is fixedly mounted between the two adjusting rods 135, a fan 133 is fixedly mounted on the transmission rod 132, two fans 133 are provided, a pushing rod 134 is fixedly mounted between the transmission rod 132 and the pushing member 916, and the pushing rod 134 passes through and is slidably mounted on the fixing ring 84.

[0073] The adjustment component includes an elastic baffle fixedly mounted on the one-way exhaust pipe 131, a fixing plate 137 is fixedly mounted on the two adjustment rods 135, a limit frame 139 is fixedly mounted on the fixing ring 84, an air bag 1310 is fixedly mounted on the limit frame 139, a plate body 1311 is slidably mounted on the limit frame 139, and the lower end of the plate body 1311 is in contact with the upper surface of the air bag 1310 (such as Fig. 20 A straight plate 138 is fixedly mounted on the plate body 1311, and two straight plates 138 are provided, and both straight plates 138 penetrate and are fixedly mounted on the elastic baffle.

[0074] The temperature control component 12 includes a drain port 123 opened on the separation kettle 5, a fixed rod 122 is fixedly installed on the push piece 917, a sealing ring 11 is fixedly installed on the fixed rod 122, and the sealing ring 11 is sealed and rotatably installed on the groove 72, and a sealing ring 121 matching the drain port 123 is fixedly installed at the lower end of the fixed rod 122.

[0075] from Figure 2 It can be seen that before the "supercritical carbon dioxide fluid" enters the separation kettle 5, the hot fluid can be easily input into the cavity 71 through the liquid inlet pipe provided on the separation kettle 5, and the inside of the separation kettle 5 can be heated by the hot fluid. Fig.18 It can be seen that in the initial state, the gap between the sealing ring 121 and the bottom wall of the cavity 71 is small. At this time, the sealing ring 121 blocks a large area of ​​the drain port 123, and the drain speed of the drain port 123 is slow.

[0076] The rate of infusion of the liquid into the cavity 71 by the liquid inlet pipe is set to be constant. When the sealing ring 121 moves upward, the blocking area of ​​the liquid outlet 123 is reduced (e.g. Fig.18 When the flow velocity of the hot fluid flowing through the cavity 71 increases, the heat transfer velocity of the hot fluid to the inside of the separation kettle 5 will also increase, thereby achieving the effect of heating the inside of the separation kettle 5, and vice versa, the temperature inside the separation kettle 5 will be reduced.

[0077] At the same time, the upper end of the cavity 71 can be sealed by the sealing ring 11 (such as Figure 3 The direction shown in the figure) can effectively prevent the gas generated by the hot fluid from mixing with the carbon dioxide gas inside the separation kettle 5, thereby reducing the purity of the carbon dioxide gas. Figure 3 It can be seen that the groove 72 has a certain depth, which helps to ensure the sealing effect on the cavity 71 after the subsequent sealing ring 11 is forced to move upward.

[0078] If the carbon dioxide sensor 86 detects that the carbon dioxide gas content generated inside the separation kettle 5 is lower than the set value (a plurality of fan blades 111 are arranged to cooperate with the air extraction speed inside the separation kettle 5, which is the same as the gas generation speed inside the separation kettle 5, and the carbon dioxide gas content inside the separation kettle 5 will be relatively stable. If the carbon dioxide concentration inside the separation kettle 5 is detected to be low, it means that at this stage, the carbon dioxide and grease separation effect in the "supercritical carbon dioxide fluid" in the separation kettle 5 is poor), the carbon dioxide sensor 86 drives the electric telescopic rod 911 to operate. At this time, the operation of the electric telescopic rod 911 will push the push rod 912 to move to the left (such as Fig.10In the process of moving, the push rod 912 will cooperate with the corresponding limit opening 910 through the two movable connecting members 913, so that the two fixing members 915 drive the corresponding pulleys 95 to move away from each other. At this time, the gap between the two pulleys 95 will gradually increase, and the contact area between the steel belt 96 and the two pulleys 95 will gradually decrease;

[0079] At the same time, when the push rod 912 moves to the left (such as Fig.10 As shown in the direction, through the cooperation of the two movable connecting members 914 and the corresponding limit openings 910, the push members 1 916 and the push members 2 917 can drive the corresponding pulleys 2 97 to approach each other. At this time, the distance between the two pulleys 2 97 will gradually decrease, and the contact area between the steel belt 96 and the two pulleys 2 97 will gradually increase, thereby achieving the effect of gradually reducing the rotation speed of the rotating rod 94 (this part is mainly the "stepless speed change" principle. Under the premise that the rotation speed of the rotating shaft 91 is constant, the spacing between the two pulleys 1 95 is greater than the spacing between the two pulleys 2 97, and the effective contact area between the two pulleys 1 95 and the steel belt 96 gradually decreases. When the two pulleys 2 97 squeeze the steel belt 96 by moving to achieve a gradual increase in the effective contact area with the steel belt 96, the rotation speed of the rotating rod 94 will be lower than the rotation speed of the rotating shaft 91, thereby achieving the effect of reducing the rotation speed of the rotating rod 94).

[0080] When the rotation speed of the rotating rod 94 is reduced, the cooperation between the bevel gear 1 98 and the bevel gear 2 and the round roller 102 can reduce the speed of the multiple fan blades 111 rotating to exhaust air inside the separation kettle 5, thereby effectively avoiding the situation in which the pressure inside the separation kettle 5 is too low at this stage, resulting in the poor separation of carbon dioxide and grease in the "supercritical carbon dioxide fluid" (when the pressure inside the separation kettle 5 is too low, it is easy to cause the carbon dioxide to gasify rapidly and form a large number of bubbles, which are easy to entrain some grease, making the separation effect of carbon dioxide and grease in the "supercritical carbon dioxide fluid" worse).

[0081] When the pusher 1 916 and the pusher 2 917 are pushed by the force to push the corresponding pulley 2 97 to approach each other, the pusher 2 917 will drive the fixing rod 122, the blocking ring 11 and the sealing ring 121 to move upward (such as Fig.17 In the process of upward movement, the sealing ring 121 will gradually reduce the blocking area of ​​the drain port 123, so as to gradually accelerate the discharge speed of the drain port 123 to the hot fluid in the cavity 71, and gradually increase the heat exchange speed of the hot fluid in the cavity 71 to the inside of the separation kettle 5, thereby achieving the effect of heating the inside of the separation kettle 5.

[0082] As the temperature inside the separation kettle 5 increases, the diffusion capacity of the carbon dioxide in the "supercritical carbon dioxide fluid" will gradually increase, which will intensify the molecular movement inside the carbon dioxide and reduce its solubility in oils and fats, thereby helping to increase the separation rate of carbon dioxide and oils and fats in the "supercritical carbon dioxide fluid". As the temperature increases, the viscosity of the oils and fats in the "supercritical carbon dioxide fluid" will also decrease. The enhancement of the fluidity of the oils and fats will be more conducive to their separation from carbon dioxide.

[0083] At the same time, when the push member 1 916 and the push member 2 917 are close to each other, the push member 1 916 will drive the push rod 134 to move downward (such as Fig.11 When the push rod 134 drives the block 136 to move downward through the two adjustment rods 135, so that the lower end of the block 136 is engaged with the upper end of the rotating rod 94 (as shown in the direction of FIG. Fig.19 The rotating rod 94 will drive the transmission rod 132 to rotate together through the block 136, and the suction force generated when the transmission rod 132 drives the two fans 133 to rotate can suck the carbon dioxide gas inside the separation kettle 5 into the one-way exhaust pipe 131, thereby achieving the effect of reducing the internal pressure of the separation kettle 5, and the gas entering the one-way exhaust pipe 131 will flow into the ventilation hole along the one-way exhaust pipe 131, and after being filtered by the non-polar membrane 101, it will enter the gas storage tank 2 along the reflux pipe.

[0084] By reducing the internal pressure of the separation kettle 5, the density of the carbon dioxide in the "supercritical carbon dioxide fluid" can be reduced, further reducing its ability to dissolve oils and fats, thereby further increasing the rate at which the oil components originally dissolved in the carbon dioxide are separated, accelerating the separation rate of carbon dioxide and oils, and helping to improve the separation effect of carbon dioxide and oils and fats in the "supercritical carbon dioxide fluid" at this stage.

[0085] At the same time, if the separation speed of carbon dioxide and grease in the "supercritical carbon dioxide fluid" is increased by increasing the temperature and reducing the pressure inside the separation kettle 5, the speed of generating new carbon dioxide gas inside the separation kettle 5 is lower than the speed of exhausting the air inside the separation kettle 5 by the two fans 133 and the plurality of fan blades 111, when the pressure inside the separation kettle 5 is too low, the airbag 1310 will gradually expand under the action of the pressure difference. During the expansion process, the airbag 1310 will push the two fixed plates 137 upward (such as Fig.19When the two fixing plates 137 move upward, the corresponding adjusting rods 135 are compressed, so that the two adjusting rods 135 drive the block 136 to move out of the rotating rod 94, thereby achieving the effect of stopping the two fans 133 from rotating and sucking air, which can effectively ensure that during this stage, the separation of carbon dioxide and grease in the "supercritical carbon dioxide fluid" inside the separation kettle 5 is promoted by increasing temperature and reducing pressure, and the pressure inside the separation kettle 5 is prevented from being too low.

[0086] When the separation rate of carbon dioxide and oil in the "supercritical carbon dioxide fluid" in the separation kettle 5 is accelerated by increasing the temperature and reducing the pressure, so that the carbon dioxide gas concentration inside the separation kettle 5 is restored to the set value of the carbon dioxide sensor 86, at this time, through the cooperation of the electric telescopic rod 911 and the push rod 912, the two pulleys 1 95 and the two pulleys 2 97, the multiple fan blades 111 can restore the initial suction speed, and the discharge port 123 can restore the initial discharge speed.

[0087] If the carbon dioxide sensor 86 detects that the carbon dioxide gas concentration inside the separation kettle 5 is higher than the set value, the carbon dioxide sensor 86 drives the electric telescopic rod 911 to move, causing the push rod 912 to move to the right (such as Fig.10 In the process, the two fixing members 915 will drive the two pulleys 1 95 to gradually approach each other, the distance between the two pulleys 1 95 will gradually decrease, and the contact area with the steel belt 96 will gradually increase. The push member 1 916 and the push member 2 917 will cooperate to drive the two pulleys 2 97 to move away from each other, so that the distance between the two pulleys 2 97 will gradually decrease, and the contact area with the steel belt 96 will gradually decrease, thereby achieving the effect of accelerating the rotation speed of the rotating rod 94.

[0088] When the rotation speed of the rotating rod 94 increases, it can effectively increase the speed of the multiple fan blades 111 to intermittently extract the gas inside the separation kettle 5 through cooperation with the round roller 102, so as to effectively ensure that when the speed of generating carbon dioxide gas inside the separation kettle 5 is too fast, the multiple fan blades 111 cooperate to evacuate the gas inside the separation kettle 5 in a timely manner. If the exhaust speed is lower than the speed of generating carbon dioxide gas inside the separation kettle 5, the internal pressure of the separation kettle 5 will gradually increase, which will not only affect the separation effect of carbon dioxide and grease, but also increase the contact time between carbon dioxide gas and grease inside the separation kettle 5, reduce the purity of carbon dioxide, and when the internal pressure of the separation kettle 5 is too high, it is easy to cause a safety accident.

[0089] When the carbon dioxide and the oil in the "supercritical carbon dioxide fluid" entering the separation kettle 5 are separated, the oil collected in the separation kettle 5 can be input into the recovery cylinder 63 by opening the valve on the discharge pipe, so that the staff can centrally collect and process the oil extracted by the equipment.

[0090] Instructions for use: When the device is needed to extract edible oil, first put the pretreated oil into the extraction kettle 4, then pressurize and heat the carbon dioxide inside the gas storage tank 2 to a supercritical state through the pressurizing device 3, and input it into the extraction kettle 4 through the gas pipe. When the supercritical carbon dioxide and the oil are fully mixed, the resulting "supercritical carbon dioxide fluid" will enter the separation kettle 5 along the conduit 61. At this time, through the cooperation of the temperature regulating component 12 and the existing pressure regulating equipment, the temperature and pressure inside the separation kettle 5 can be adaptively adjusted according to the temperature and pressure required for the "supercritical carbon dioxide fluid" to separate carbon dioxide and oil.

[0091] When the carbon dioxide collected inside the separation kettle 5 gradually increases, the carbon dioxide sensor 86 and the servo motor 81 are started. The operation of the carbon dioxide sensor 86 will detect the concentration of carbon dioxide in the separation kettle 5, and the operation of the servo motor 81 will cooperate with the driving component 8, the speed regulating component 9, and the exhaust component 10 to drive the multiple fan blades 111 to rotate to suck the carbon dioxide gas inside the separation kettle 5 into the ventilation hole, and after being filtered by the non-polar membrane 101, it enters the gas storage tank 2 along the return air pipe 62, thereby effectively improving the recovery speed of the carbon dioxide gas and the purity of the recovered carbon dioxide gas.

[0092] If the carbon dioxide sensor 86 detects that the carbon dioxide concentration inside the separation kettle 5 is lower than the set value of the carbon dioxide sensor 86 (that is, the separation effect of carbon dioxide and grease in the "supercritical carbon dioxide fluid" inside the separation kettle 5 is poor at this time), the speed regulating component 9 and the exhaust component 10 can be used to reduce the speed of the plurality of fan blades 111 at this stage to cooperate with the exhaust speed of the separation kettle 5. At the same time, the speed regulating component 9 cooperates with the temperature regulating component 12 and the pressure regulating component 13 to increase the separation speed of carbon dioxide and grease in the "supercritical carbon dioxide fluid" by increasing the temperature and reducing the pressure inside the separation kettle 5, which helps to improve the separation effect of the two.

[0093] If the carbon dioxide sensor 86 detects that the carbon dioxide concentration in the separation kettle 5 is higher than the set value of the carbon dioxide sensor 86, the speed regulating component 9 and the exhaust component 10 can effectively speed up the exhaust speed of the multiple fan blades 111 inside the separation kettle 5, thereby achieving the effect of timely adjusting the exhaust speed of the multiple fan blades 111 according to the concentration of carbon dioxide gas inside the separation kettle 5.

[0094] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A supercritical edible oil extraction system, comprising a support frame (1), a separation kettle (5) being fixedly mounted on the support frame (1), a placement component (7) being arranged in the separation kettle (5), a driving component (8) being arranged in the separation kettle (5), and a temperature adjustment component (12) being arranged in the separation kettle (5); Features: The driving assembly (8) comprises a servo motor (81) fixedly mounted on the separation kettle (5); a rotating shaft (82) is fixedly mounted on the driving end of the servo motor (81); a fixing frame (83) is fixedly mounted on the rotating shaft (82); a fixing ring (84) is fixedly mounted on the fixing frame (83); a sealing ring (85) is fixedly mounted on the fixing ring (84); and the sealing ring (85) is sealingly rotatably mounted in the separation kettle (5); an exhaust assembly (10) is arranged on the sealing ring (85); a carbon dioxide sensor (86) is fixedly mounted on the fixing ring (84); a speed regulating assembly (9) is arranged on the fixing ring (84); and a pressure regulating assembly (13) is arranged on the fixing ring (84); The speed regulating assembly (9) comprises a rotating shaft (91) rotatably mounted on the lower end of a fixed ring (84); a rotating rod (94) passes through the fixed ring (84) and is rotatably mounted thereon; a speed regulating mechanism is fixedly mounted between the rotating shaft (91) and the rotating rod (94); The pressure regulating assembly (13) comprises a one-way exhaust pipe (131) fixedly mounted on the upper end of a fixing ring (84); a support block is fixedly mounted inside the one-way exhaust pipe (131); a transmission rod (132) passes through the support block and is slidably mounted; a transmission component is commonly mounted between the transmission rod (132) and the rotating rod (94); and an adjustment component is commonly fixedly mounted between the transmission rod (132) and the fixing ring (84).

2. A supercritical edible oil extraction system according to claim 1, characterized in that: The placement component (7) comprises a cavity (71) provided in the separation kettle (5), a groove (72) in communication with the cavity (71) is provided in the separation kettle (5), and a placement groove (73) is provided in the separation kettle (5).

3. A supercritical edible oil extraction system according to claim 2, characterized in that: The speed regulating mechanism comprises a rotating gear (92) fixedly mounted on a rotating shaft (91); a ring rack (93) meshing with the rotating gear (92) is fixedly mounted on the placement groove (73); a pulley 1 (95) is slidably mounted on the rotating shaft (91); two pulleys 1 (95) are provided; a pulley 2 (97) is slidably mounted on the rotating rod (94); two pulleys 2 (97) are provided; a steel belt (96) is sleeved and mounted between the two pulleys 1 (95) and the two pulleys 2 (97); and a pushing component is installed on the fixed ring (84).

4. A supercritical edible oil extraction system according to claim 3, characterized in that: The pushing component comprises a support plate (99) fixedly mounted on the lower end of the fixing ring (84); an electric telescopic rod (911) is fixedly mounted on the support plate (99); a push rod (912) is fixedly mounted on the electric telescopic rod (911); a limiting opening (910) is provided on the support plate (99); two limiting openings (910) are provided; a fixing member (915) is slidably mounted on the right limiting opening (910); two fixing members (915) are provided, and both fixing members (915) are connected to corresponding pulleys (95 ) are rotatably connected, a movable connecting member 1 (913) is installed between the two fixing members (915) and the push rod (912), a push member 1 (916) is slidably installed on the left limit opening (910), a push member 2 (917) is slidably installed on the left limit opening (910), and the push member 1 (916) and the push member 2 (917) are rotatably connected to the corresponding pulley 2 (97), and a movable connecting member 2 (914) is installed between the push rod (912) and the push member 1 (916) and the push member 2 (917).

5. The supercritical edible oil extraction system according to claim 1, characterized in that: The exhaust assembly (10) comprises a ventilation hole formed on a sealing ring (85), and one end of a one-way exhaust pipe (131) seals and penetrates the sealing ring (85) and extends into the ventilation hole. An electrodeless membrane (101) is fixedly installed in the ventilation hole. A positioning plate is fixedly installed in the ventilation hole. A round roller (102) is penetrated and rotatably installed on the positioning plate. A sleeve (108) is slidably installed on the round roller (102). Round rods (110) evenly distributed in an annular shape are fixedly installed on the sleeve (108). Fan blades (111) are rotatably installed on the round rods (110). The sleeve (108) is provided with sliding grooves (116) uniformly distributed in an annular shape, and movable plates (115) are slidably mounted on the sliding grooves (116). Slide blocks (109) are fixedly mounted between the movable plates (115). Blocks (112) uniformly distributed in an annular shape are fixedly mounted on the slide blocks (109). Sliding grooves (113) are provided on the blocks (112). Pushing members (114) are slidably mounted on the sliding grooves (113), and the pushing members (114) are fixedly connected to corresponding fan blades (111). A driving component is installed between the round roller (102) and the rotating rod (94).

6. A supercritical edible oil extraction system according to claim 5, characterized in that: The driving component comprises a bevel gear 1 (98) fixedly mounted on a rotating rod (94); a bevel gear 2 meshing with the bevel gear 1 (98) is fixedly mounted on the circular roller (102); a shaft (104) is rotatably mounted in the ventilation hole; rotating wheels are fixedly mounted on the rotating rod (94) and the shaft (104); a conveyor belt (103) is sleeved between the two rotating wheels; and an eccentric wheel (105) is fixedly mounted on the shaft (104); A vertical plate is fixedly mounted on the ventilation hole, and two vertical plates are provided. A spring rod (106) is fixedly mounted on the two vertical plates. A push plate (107) is fixedly mounted between the two spring rods (106). An annular groove is formed on the push plate (107). Balls evenly distributed in an annular shape are slidably mounted on the annular groove, and the balls are fixedly connected to the slider (109).

7. The supercritical edible oil extraction system according to claim 4, characterized in that: The transmission component comprises an adjusting rod (135) fixedly mounted on the lower end of the transmission rod (132), two adjusting rods (135) are provided, a clamping block (136) matched with the rotating rod (94) is fixedly mounted between the two adjusting rods (135), a fan (133) is fixedly mounted on the transmission rod (132), two fans (133) are provided, a push rod (134) is fixedly mounted between the transmission rod (132) and the push member 1 (916), and the push rod (134) passes through and is slidably mounted on the fixing ring (84).

8. The supercritical edible oil extraction system according to claim 1, characterized in that: The adjustment component comprises an elastic baffle fixedly mounted on the one-way exhaust pipe (131); a fixing plate (137) is fixedly mounted on the two adjustment rods (135); a limit frame (139) is fixedly mounted on the fixing ring (84); an air bag (1310) is fixedly mounted on the limit frame (139); a plate body (1311) is slidably mounted on the limit frame (139); and the lower end of the plate body (1311) is in contact with the upper surface of the air bag (1310); a straight plate (138) is fixedly mounted on the plate body (1311); two straight plates (138) are provided, and both straight plates (138) penetrate through and are fixedly mounted on the elastic baffle.

9. The supercritical edible oil extraction system according to claim 4, characterized in that: The temperature control component (12) includes a liquid discharge port (123) provided on the separation kettle (5); a fixing rod (122) is fixedly mounted on the second pusher (917); a sealing ring (11) is fixedly mounted on the fixing rod (122); and the sealing ring (11) is sealingly rotatably mounted on the groove (72); and a sealing ring (121) matching the liquid discharge port (123) is fixedly mounted on the lower end of the fixing rod (122).

10. The supercritical edible oil extraction system according to claim 1, characterized in that: The separation kettle (5) is provided with a recovery component (6), the recovery component (6) comprises a recovery cylinder (63) fixedly mounted on the support frame (1), a liquid discharge pipe is fixedly connected between the recovery cylinder (63) and the separation kettle (5), a gas storage tank (2) is fixedly mounted on the support frame (1), an extraction kettle (4) is fixedly mounted on the support frame (1), a gas transmission pipe is fixedly connected between the gas storage tank (2) and the extraction kettle (4), a pressurizing device (3) is fixedly mounted on the gas transmission pipe, a conduit (61) is fixedly connected between the extraction kettle (4) and the separation kettle (5), and a return air pipe (62) is fixedly connected between the gas storage tank (2) and the separation kettle (5).

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