Millet grease removal and recovery device and method

Abstract

The invention discloses a millet grease removal and recovery device and method, and relates to the technical field of millet deep processing devices.The millet grease removal and recovery device comprises a CO2 high-pressure storage tank, and a pressure reducing valve is installed at a tank opening of the CO2 high-pressure storage tank; a rice barrel inlet and outlet is formed in the oil removing tank; an outlet of the pressure reducing valve is connected with an inlet of the deoiling tank through a first conveying pipe to convey a CO2 solvent to an inner cavity of the deoiling tank; the supercritical rice containing barrel is arranged into the inner cavity of the oil removing tank from the rice barrel inlet and outlet; an inlet of the oil collecting tank is connected with an outlet of the oil removing tank through a second conveying pipe so as to collect millet grease; a first pressure controller and a second pressure controller; the first pressure controller is mounted on the first conveying pipe to control the extraction pressure of the inner cavity of the oil removing tank; the second pressure controller is installed on the second conveying pipe so that the mixed liquid can be conveyed into the oil collecting tank under reduced pressure. According to the method, grease in millet can be effectively removed and recycled in a centralized manner, so that rancidity of the instant millet congee due to fat oxidation is prevented, and the storage period of the instant millet congee is effectively prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of millet deep processing devices, and in particular to a millet grease removal and recovery device and method. Background Art

[0002] As a major millet producer, China has abundant millet production. As a kind of grain, millet does not need excessive fine processing when eaten, thus avoiding the harm caused by fine processing. Moreover, millet has high nutritional value, comprehensive and balanced nutrition, and contains many main nutrients needed by the human body, which has been constantly concerned by scientists. The traditional way of cooking porridge takes a long time to cook, which is incompatible with the current fast-paced life and the trend of saving. However, the convenient millet porridge is cooked in advance, which greatly shortens the time for consumers. However, because millet contains 2.0-3.0% fat, the main fatty acids in millet are linoleic acid, oleic acid, linolenic acid, palmitic acid, stearic acid, and arachidonic acid, and unsaturated fatty acids account for 85.54% of the total fatty acids. Therefore, during the storage of convenient millet porridge, fat oxidation is prone to occur, resulting in rancid taste and a short shelf life.

[0003] Therefore, how to design a millet oil removal and recovery device and method, which can effectively remove the oil in millet and recover it in a centralized manner to prevent the instant millet porridge from having a rancid smell due to fat oxidation, effectively extend the storage period of the instant millet porridge, and improve the liquidity of the product is an urgent problem that technicians in this field need to solve. Summary of the invention

[0004] In view of this, the present invention proposes a millet oil removal and recovery device and method, aiming to solve the technical problems of the above-mentioned traditional instant millet porridge products being prone to rancidity, short storage period and poor product circulation.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The present invention provides a millet oil removal and recovery device, comprising:

[0007] A CO2 high-pressure storage tank, wherein a pressure reducing valve is installed at the tank mouth of the CO2 high-pressure storage tank;

[0008] A de-oiling tank, wherein the de-oiling tank is provided with a rice barrel inlet and outlet; the outlet of the pressure reducing valve is connected to the inlet of the de-oiling tank through a first delivery pipe to deliver CO2 solvent to the inner cavity of the de-oiling tank;

[0009] A supercritical rice loading barrel, wherein the supercritical rice loading barrel is loaded into the inner cavity of the de-oiling tank from the rice barrel inlet and outlet;

[0010] An oil collecting tank, the inlet of which is connected to the outlet of the de-oiling tank via a second delivery pipe to collect millet oil;

[0011] Pressure controller one and pressure controller two; the pressure controller one is installed on the first delivery pipe to control the extraction pressure of the inner cavity of the de-oiling tank; the pressure controller two is installed on the second delivery pipe to reduce the pressure of the CO2 solvent and millet oil mixture and deliver it to the oil collecting tank.

[0012] When the millet oil removal and recovery device of the present invention is used, CO2 solvent is stored in the CO2 high-pressure storage tank, and the pressure reducing valve is used to control the output of the CO2 solvent. The extraction pressure of the inner cavity of the de-oiling tank can be adjusted by the pressure controller 1 to stabilize the CO2 solvent at the supercritical pressure. The supercritical rice barrel is used to fill the millet particles. In the de-oiling tank, the millet particles in the supercritical rice barrel are fully contacted with the CO2 solvent for extraction and de-oiling; the pressure controller 2 is used to control the CO2 solvent and the millet oil mixed liquid to be decompressed and transported to the oil collecting tank through the second conveying pipe. After decompression, the CO2 solvent can be separated from the millet oil, so that the millet oil can be centrally recovered and stored in the oil collecting tank. The present invention can effectively remove and centrally recover the oil in millet, which can avoid the situation that the convenient millet porridge has a rancid taste due to fat oxidation, so as to extend the storage period of the convenient millet porridge; at the same time, the recovered millet oil can be individually sealed and packaged as a material bag to extend its storage period and improve the circulation of the product.

[0013] As a further improvement of the above technical solution, the de-oiling tank is provided with a sealing cover for sealing the inlet and outlet of the rice barrel.

[0014] The beneficial effect of the above technical solution is that the sealing cover is used to seal the inlet and outlet of the rice barrel to ensure the stability of the high-pressure environment for extraction and deoiling in the deoiling tank.

[0015] As a further improvement of the above technical solution, it also includes flowmeter 1 and flowmeter 2; the flowmeter 1 is installed on the first delivery pipe to measure the output of CO2 solvent; the outlet of the oil collecting tank is connected to the pipeline between the first delivery pipe corresponding to the flowmeter 1 and the pressure controller 1 through the third delivery pipe; the flowmeter 2 is installed on the third delivery pipe to measure the return amount of CO2 solvent.

[0016] The beneficial effects of the above technical scheme are: the first delivery pipe, the deoiling tank, the second delivery pipe, the oil collecting tank and the third delivery pipe are connected in series in sequence to form a CO2 solvent circulation loop; the flow meter 1 is used to measure the output of the CO2 solvent; in the actual extraction process, the pressure controller 1 stabilizes the high-pressure CO2 solvent in the deoiling tank at a supercritical pressure. After the extraction is completed, the pressure controller 2 opens the second delivery pipe to decompress the CO2 solvent and the millet oil mixture and transport it to the oil collecting tank. The decompressed CO2 solvent becomes gas and is separated from the millet oil, and the millet oil remains in the oil collecting tank. The gaseous CO2 solvent returns to the first delivery pipe through the third delivery pipe, and the flow meter 2 is used to measure the return amount of the CO2 solvent; according to the loss of the CO2 solvent, the pressure reducing valve can be opened to replenish the CO2 solvent for the next deoiling process.

[0017] As a further improvement of the above technical solution, the pressure reducing valve is an electrically controlled pressure reducing valve.

[0018] As a further improvement of the above technical solution, it also includes a controller, which is electrically connected to flow meter 1, flow meter 2 and the pressure reducing valve.

[0019] The beneficial effect of the above technical solution is that flow meter 1 and flow meter 2 can feed back the measured CO2 solvent flow conditions to the controller, and the controller can control the opening and closing state of the pressure reducing valve according to the CO2 solvent output and return amount.

[0020] As a further improvement of the above technical solution, the pressure controller 1 and the pressure controller 2 are both pressure regulating valves.

[0021] As a further improvement of the above technical solution, it also includes a heating sleeve, which is arranged on the outside of the deoiling tank to control the extraction temperature of the inner cavity of the deoiling tank.

[0022] The beneficial effect of the above technical solution is that the heating jacket is used to control the extraction temperature, and the supercritical state of the CO2 solvent can be regulated by using the heating jacket, pressure controller 1, pressure controller 2 and pressure reducing valve in combination.

[0023] As a further improvement of the above technical solution, a grease outlet is provided on the oil collecting tank.

[0024] The beneficial effect of the above technical solution is that the oil removal outlet can conveniently take out the extracted millet oil from the oil collecting tank.

[0025] Another aspect of the present invention provides a method for removing and recovering millet grease, comprising the millet grease removal and recovery device; the specific steps include:

[0026] Step 1: Place the supercritical rice barrel containing millet grains into the inner cavity of the de-oiling tank, and seal the de-oiling tank;

[0027] Step 2: Open the pressure reducing valve to output the CO2 solvent in the CO2 high-pressure storage tank to the de-oiling tank for millet oil extraction; the flow rate of the CO2 solvent is 5-7 kg / h; the extraction temperature in the inner cavity of the de-oiling tank is 38-46°C, and the extraction pressure is 15-18 MPa;

[0028] Step 3: After deoiling for 75 to 90 minutes, the mixture of CO2 solvent and grease is introduced into the oil collecting tank through the second delivery pipe, and the pressure in the inner cavity of the oil collecting tank is controlled at 8 to 10 MPa by the second pressure controller.

[0029] As a further improvement of the above technical solution, the method further includes step 4: taking out the millet oil in the oil collecting tank and independently sealing and packaging it as a convenient millet porridge material bag.

[0030] The beneficial effect of the above technical solution is: the millet oil is centrally recovered and independently sealed and packaged as a convenient millet porridge material package, which can improve the circulation of the millet porridge product.

[0031] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a millet oil removal and recovery device and method, which has the following advantages and beneficial effects:

[0032] 1. The present invention adopts a physical method of supercritical CO2 solvent extraction to remove the grease in millet, which can be used in the production of instant millet porridge to prevent the finished instant millet porridge from generating a rancid smell due to oxidation during storage. By independently packaging the grease as an instant millet material bag, the nutrients of the millet are retained and the long-term storage of the instant millet porridge is achieved.

[0033] 2. The millet oil removal and recovery device of the present invention can realize the recycling of CO2 solvent and reduce the use cost of CO2 solvent. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the overall structure of a millet oil removal and recovery device of the present invention;

[0036] Figure 2 A schematic diagram of the structure of a supercritical rice barrel of a millet oil removal and recovery device of the present invention;

[0037] In the figure: 1. CO2 high-pressure storage tank; 11. Pressure reducing valve; 2. De-oiling tank; 21. Sealing cover; 22. First delivery pipe; 23. Second delivery pipe; 24. Third delivery pipe; 3. Supercritical rice barrel; 31. Barrel body; 32. Support hoop; 4. Oil collecting tank; 5. Pressure controller 1; 6. Pressure controller 2; 7. Flow meter 1; 8. Flow meter 2; 9. Heating jacket. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] According to an embodiment of the present invention, Figure 1 to Figure 2 As shown, a millet oil removal and recovery device includes: a CO2 high-pressure storage tank 1, an oil removal tank 2, a supercritical rice barrel 3, an oil collecting tank 4, a pressure controller 1 5 and a pressure controller 2 6.

[0043] A pressure reducing valve 11 is installed at the tank mouth of the CO2 high-pressure storage tank 1. A rice barrel inlet and outlet are provided on the de-oiling tank 2; the outlet of the pressure reducing valve 11 is connected and communicated with the inlet of the de-oiling tank 2 through the first delivery pipe 22 to deliver the CO2 solvent to the inner cavity of the de-oiling tank 2. The supercritical rice barrel 3 is loaded into the inner cavity of the de-oiling tank 2 from the rice barrel inlet and outlet. The inlet of the oil collecting tank 4 is connected and communicated with the outlet of the de-oiling tank 2 through the second delivery pipe 23 to collect millet oil. The pressure controller 1 5 is installed on the first delivery pipe 22 to control the extraction pressure of the inner cavity of the de-oiling tank 2; the pressure controller 2 6 is installed on the second delivery pipe 23 to decompress the CO2 solvent and the millet oil mixture and deliver it to the oil collecting tank 4.

[0044] When a millet oil removal and recovery device of the present embodiment is used, CO2 solvent is stored in the CO2 high-pressure storage tank 1, and the pressure reducing valve 11 is used to control the output of the CO2 solvent. The extraction pressure of the inner cavity of the de-oiling tank 2 can be adjusted by the pressure controller 1 5 to stabilize the CO2 solvent at the supercritical pressure. The supercritical rice barrel 3 is used to fill the millet particles. In the de-oiling tank 2, the millet particles in the supercritical rice barrel 3 are fully contacted with the CO2 solvent for extraction and de-oiling; the pressure controller 2 6 is used to control the CO2 solvent and the millet oil mixed liquid to be decompressed and transported to the oil collecting tank 4 through the second conveying pipe 23. After decompression, the CO2 solvent can be separated from the millet oil, so that the millet oil can be concentratedly recovered and stored in the oil collecting tank 4. The present invention can effectively remove and concentrate the oil from millet, avoid the situation that the convenient millet porridge has a rancid taste due to fat oxidation, and prolong the storage period of the convenient millet porridge; at the same time, the recovered millet oil can be individually sealed and packaged as a material bag to prolong its storage period and improve the circulation of the product.

[0045] In some embodiments, the supercritical rice barrel 3 includes a barrel body 31 and a support hoop 32; the support hoop 32 is fixedly installed on the peripheral wall of the barrel body 31 to support and reinforce the barrel body 31 to prevent the barrel body 31 from deforming under the action of changing pressure.

[0046] Specifically, the barrel body 31 is in a non-sealed state; an opening or through hole can be opened on the wall of the barrel body 31 to facilitate full contact between the CO2 solvent and the millet particles; the size of the through hole is smaller than the size of the millet particles.

[0047] In some embodiments, the de-oiling tank 2 is provided with a sealing cover 21 for sealing the inlet and outlet of the rice barrel.

[0048] The sealing cover 21 is used to seal the inlet and outlet of the rice barrel to ensure that the high-pressure environment for extraction and deoiling in the deoiling tank 2 is stable.

[0049] In some embodiments, flowmeter 1 7 and flowmeter 2 8 are also included; flowmeter 1 7 is installed on the first delivery pipe 22 to measure the output of CO2 solvent from the CO2 high-pressure storage tank 1; the outlet of the oil collecting tank 4 is connected to the pipeline between the flowmeter 1 7 and the pressure controller 1 5 corresponding to the first delivery pipe 22 through the third delivery pipe 24; flowmeter 2 8 is installed on the third delivery pipe 24 to measure the return amount of CO2 solvent.

[0050] The first delivery pipe 22, the de-oiling tank 2, the second delivery pipe 23, the oil collecting tank 4 and the third delivery pipe 24 are connected in series in sequence to form a CO2 solvent circulation loop; the flow meter 7 is used to measure the output of the CO2 solvent; in the actual extraction process, the pressure controller 5 stabilizes the high-pressure CO2 solvent in the de-oiling tank 2 at a supercritical pressure. After the extraction is completed, the pressure controller 2 6 opens the second delivery pipe 23 to decompress the CO2 solvent and the millet oil mixture and transport it to the oil collecting tank 4. The CO2 solvent after decompression becomes gas and is separated from the millet oil, and the millet oil remains in the oil collecting tank 4. The gaseous CO2 solvent returns to the first delivery pipe 22 through the third delivery pipe 24. The flow meter 2 8 is used to measure the return amount of the CO2 solvent; according to the loss of the CO2 solvent, the pressure reducing valve 11 can be opened to replenish the CO2 solvent for the next de-oiling process.

[0051] Specifically, one end of the first delivery pipe 22 is connected to and communicated with the outlet of the pressure reducing valve 11, and the other end is connected to and communicated with the inlet of the de-oiling tank 2; one end of the second delivery pipe 23 is connected to and communicated with the outlet of the de-oiling tank 2, and the other end is connected to and communicated with the inlet of the oil collecting tank 4; one end of the third delivery pipe 24 is connected to and communicated with the outlet of the oil collecting tank 4, and the other end is connected to and communicated with the first delivery pipe 22. The outlet of the de-oiling tank 2 can be opened at the lower part of the de-oiling tank 2 to facilitate the outflow of the CO2 solvent and the millet oil mixture.

[0052] In some embodiments, the pressure reducing valve 11 is an electrically controlled pressure reducing valve.

[0053] In some embodiments, a controller is also included, which is electrically connected to flow meter 1 7 , flow meter 2 8 and pressure reducing valve 11 .

[0054] Flowmeter 1 7 and flowmeter 2 8 can feed back the measured CO2 solvent flow conditions to the controller, and the controller can control the opening and closing state of the pressure reducing valve 11 according to the output and return amounts of the CO2 solvent.

[0055] In some embodiments, pressure controller 1 5 and pressure controller 2 6 are both pressure regulating valves.

[0056] Specifically, pressure controller 1 5 and pressure controller 2 6 can use electronically controlled pressure regulating valves; the controller electrically connects pressure controller 1 5 and pressure controller 2 6 to control the opening and closing and opening size of pressure controller 1 5 and pressure controller 2 6.

[0057] In some embodiments, a heating jacket 9 is further included, and the heating jacket 9 is mounted on the outside of the de-oiling tank 2 to control the extraction temperature of the inner cavity of the de-oiling tank 2 .

[0058] The heating jacket 9 is used to control the extraction temperature. The heating jacket 9 is coaxially sleeved on the outer periphery of the de-oiling tank 2 to make the extraction temperature in the inner cavity of the de-oiling tank 2 more uniform. The supercritical state of the CO2 solvent can be regulated by using the heating jacket 9, the pressure controller 1 5, the pressure controller 2 6 and the pressure reducing valve 11 in combination.

[0059] Specifically, the heating sleeve 9 is an electric heating sleeve, and the controller is electrically connected to the heating sleeve 9 to control its heating power; a temperature sensor for detecting the temperature of the inner cavity of the deoiling tank 2 is installed, and the controller is electrically connected to the temperature sensor to receive the temperature signal fed back by the temperature sensor, and regulate the extraction temperature of the inner cavity of the deoiling tank 2.

[0060] In some embodiments, a grease outlet is provided on the oil collecting tank 4 .

[0061] The grease outlet can be used to conveniently take out the millet grease obtained by extraction from the oil collecting tank 4 .

[0062] Specifically, a valve is installed at the grease outlet of the oil collecting tank 4 to facilitate opening and closing the grease outlet.

[0063] Another embodiment of the present invention provides a method for removing and recovering millet grease, including a millet grease removal and recovery device; the specific steps include:

[0064] Step 1: Place the supercritical rice barrel 3 containing millet grains into the inner cavity of the de-oiling tank 2, and seal the de-oiling tank 2;

[0065] Step 2: Open the pressure reducing valve 11 to output the CO2 solvent in the CO2 high-pressure storage tank 1 to the de-oiling tank 2 for millet oil extraction; the flow rate of the CO2 solvent is 5-7 kg / h; the extraction temperature in the inner cavity of the de-oiling tank 2 is 38-46°C, and the extraction pressure is 15-18 MPa;

[0066] Step 3: After deoiling for 75 to 90 minutes, the mixture of CO2 solvent and grease is fed into the oil collecting tank 4 through the second delivery pipe 23, and the pressure in the inner cavity of the oil collecting tank 4 is controlled by the pressure controller 26 to be 8 to 10 MPa.

[0067] In some embodiments, the method further includes step 4: taking out the millet oil in the oil collecting tank 4 and sealing and packaging the oil independently to serve as a convenient millet porridge material package.

[0068] Centralized collection and independent sealed packaging of millet oil as convenient millet porridge material packages can improve the circulation of millet porridge products.

[0069] Specifically, the experimental research process of oil removal is as follows:

[0070] (1) Determination of extraction time

[0071] The study found that as the extraction time increased, the fat content in millet decreased. Through comparison, it was found that most of the oil was extracted within 75 minutes, so 75 to 90 minutes were chosen to process millet.

[0072] (2) Effect of extraction temperature on millet oil yield

[0073] Under the conditions of extraction pressure of 20MPa and CO2 flow rate of 5kg / h, the relationship between millet oil yield and temperature change at extraction temperatures of 38℃, 40℃, 42℃, 44℃, 46℃, 48℃ and 50℃ was studied experimentally. Temperature has a significant effect on the oil yield of millet oil. Within the research range, the oil yield is the largest at 38℃ and drops sharply at 46℃. Therefore, 38-46℃ was selected to process millet.

[0074] (3) Effect of extraction pressure on millet oil yield

[0075] Under the conditions of extraction temperature of 38°C and CO2 flow rate of 5kg / h, the extraction amount of millet oil at extraction pressures of 10MPa, 20MPa, 25MPa, 30MPa and 35MPa was studied. The extraction amount was not much different at 15MPa-30MPa. Although the extraction amount increased at 35MPa, the increase was only about 5%. Therefore, considering the energy consumption, the extraction pressure was selected to be 15-18MPa.

[0076] (4) Effect of CO2 flow rate on millet oil yield

[0077] The millet oil output and CO2 flow rate are when the extraction temperature is 38°C, the extraction pressure is 15MPa, and the CO2 flow rate is 3kg / h, 5kg / h, 7kg / h, and 9kg / h. As the flow rate increases, the oil output of millet increases. Considering that increasing the flow rate increases the production cost, the CO2 flow rate of 5-7kg / h is selected.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0079] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A millet oil removal and recovery device, characterized in that: include: A CO2 high-pressure storage tank (1), wherein a pressure reducing valve (11) is installed at the tank opening of the CO2 high-pressure storage tank (1); The de-oiling tank (2) is provided with a rice barrel inlet and outlet; the outlet of the pressure reducing valve (11) is connected to the inlet of the de-oiling tank (2) through a first delivery pipe (22) to deliver CO2 solvent to the inner cavity of the de-oiling tank (2); A supercritical rice loading barrel (3), wherein the supercritical rice loading barrel (3) is loaded into the inner cavity of the de-oiling tank (2) from the rice barrel inlet and outlet; An oil collecting tank (4), the inlet of which is connected to the outlet of the de-oiling tank (2) via a second delivery pipe (23) to collect millet oil; Pressure controller one (5) and pressure controller two (6); the pressure controller one (5) is installed on the first delivery pipe (22) to control the extraction pressure in the inner cavity of the de-oiling tank (2); the pressure controller two (6) is installed on the second delivery pipe (23) to reduce the pressure of the CO2 solvent and millet oil mixture and deliver it to the oil collecting tank (4).

2. A millet oil removal and recovery device according to claim 1, characterized in that: The de-oiling tank (2) is provided with a sealing cover (21) for sealing the inlet and outlet of the rice barrel.

3. A millet oil removal and recovery device according to claim 1, characterized in that: It also includes a flow meter 1 (7) and a flow meter 2 (8); the flow meter 1 (7) is installed on the first delivery pipe (22) to measure the output of the CO2 solvent; the outlet of the oil collecting tank (4) is connected to the pipeline between the first delivery pipe (22) corresponding to the flow meter 1 (7) and the pressure controller 1 (5) through the third delivery pipe (24); the flow meter 2 (8) is installed on the third delivery pipe (24) to measure the return amount of the CO2 solvent.

4. A millet oil removal and recovery device according to claim 3, characterized in that: The pressure reducing valve (11) is an electrically controlled pressure reducing valve.

5. A millet oil removal and recovery device according to claim 4, characterized in that: It also includes a controller, which is electrically connected to flow meter 1 (7), flow meter 2 (8) and the pressure reducing valve (11).

6. A millet oil removal and recovery device according to claim 5, characterized in that: The pressure controller 1 (5) and the pressure controller 2 (6) are both pressure regulating valves.

7. A millet oil removal and recovery device according to claim 1, characterized in that: It also comprises a heating jacket (9), wherein the heating jacket (9) is sleeved on the outside of the deoiling tank (2) to control the extraction temperature of the inner cavity of the deoiling tank (2).

8. A millet oil removal and recovery device according to claim 1, characterized in that: The oil collecting tank (4) is provided with a grease outlet.

9. A method for removing and recovering millet oil, characterized in that: The invention comprises a millet oil removal and recovery device as described in any one of claims 1 to 8; the specific steps include: Step 1: placing a supercritical rice barrel (3) containing millet grains into the inner cavity of the de-oiling tank (2), and sealing the de-oiling tank (2); Step 2: Open the pressure reducing valve (11) to output the CO2 solvent in the CO2 high-pressure storage tank (1) to the de-oiling tank (2) for millet oil extraction; the flow rate of the CO2 solvent is 5 to 7 kg / h; the extraction temperature in the inner cavity of the de-oiling tank (2) is 38 to 46° C., and the extraction pressure is 15 to 18 MPa; Step 3: After deoiling for 75 to 90 minutes, the mixture of CO2 solvent and grease is introduced into the oil collecting tank (4) through the second delivery pipe (23), and the pressure in the inner cavity of the oil collecting tank (4) is controlled to 8 to 10 MPa by the second pressure controller (6).

10. A millet oil removal and recovery method according to claim 9, characterized in that: The method also includes step 4: taking out the millet oil in the oil collecting tank (4) and sealing and packaging the oil independently to form a convenient millet porridge material package.

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