Rotational flow separation device and separation method based on high-pressure liquid CO2

Abstract

The invention discloses a cyclone separation device and method based on high-pressure liquid CO2 in the technical field of cyclone separation, and the cyclone separation device comprises a separation bin which is used for carrying out cyclone separation on heterogeneous materials, so that a heavy phase moves downwards along the inner wall of the separation bin, and a light phase moves upwards from the center of the separation bin; the material receiving bin is connected to the lower part of the separation bin through a material receiving pipe and is used for collecting the heavy phase moving downwards from the separation bin; the tailing bin is connected with the center of the top of the separation bin through a tailing pipe and used for collecting the light phase moving upwards in the separation bin; the CO2 input pipe is connected with the separation bin and is used for inputting high-pressure liquid CO2 into the separation bin so as to reduce the resistance of the separation medium to the material, and a liquid inlet valve is mounted on the CO2 input pipe; the feeding bin is communicated with the separation bin through a feeding pipe, and a feeding valve is arranged on the feeding pipe; the top of the feeding bin is further communicated with the CO2 input pipe through a feeding pipe, and a feeding valve is arranged on the feeding pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of cyclone separation, and in particular to a cyclone separation device and a separation method based on high-pressure liquid CO2. Background Art

[0002] A cyclone separator is a mechanical device that uses the principle of centrifugal sedimentation to separate heterogeneous mixtures. As a typical non-thermal physical separation method, cyclone separation mainly uses the centrifugal force generated by the high-speed revolution of dispersed phase particles and continuous phase fluid around the central axis of the cyclone to achieve the distribution of two or more phases with density difference at different positions in the radial direction of the cyclone. The heavy phase migrates to the side wall of the cyclone and is finally discharged from the bottom flow port, while the light phase migrates to the center of the cyclone and is finally discharged from the overflow pipe, thereby achieving the separation of heterogeneous mixtures.

[0003] However, when the material particles are irregular in shape, especially flaky, the resistance of the material particles in water will become greater, increasing the difficulty of sorting. Summary of the invention

[0004] The purpose of the present invention is to provide a cyclone sorting device and a sorting method based on high-pressure liquid CO2 to solve the technical problem in the prior art that when the shape of material particles is irregular, especially flaky, the resistance of the material particles in water becomes larger, increasing the difficulty of sorting.

[0005] In order to solve the above technical problems, a cyclone separation device based on high pressure liquid CO2 is provided, comprising:

[0006] A separation bin, which is used to perform cyclone separation on heterogeneous materials, so that the heavy phase migrates downward along the inner wall of the separation bin and the light phase migrates upward from the center of the separation bin;

[0007] A material receiving bin, connected to the bottom of the separation bin through a material receiving pipe, and used for collecting the heavy phase migrating downward in the separation bin;

[0008] A tailings bin connected to the center of the top of the separation bin through a tailings pipe, and used to collect the light phase migrating upward in the separation bin;

[0009] A CO2 input pipe is connected to the separation chamber and is used to input high-pressure liquid CO2 into the separation chamber to reduce the resistance of the separation medium to the material, and a liquid inlet valve is installed on the CO2 input pipe;

[0010] A feeding bin is connected to the separation bin through a feeding pipe, and a feeding valve is provided on the feeding pipe;

[0011] The top of the feeding bin is also connected to the CO2 input pipe through a feeding pipe, and a feeding valve is provided on the feeding pipe. The feeding pipe can introduce high-pressure liquid CO2 into the feeding bin to help the material in the feeding bin enter the separation bin in a high-pressure state.

[0012] As a preferred embodiment of the present invention, the cyclone separation device further comprises a high-pressure bin, which is used to apply high pressure to the feeding bin and the separation bin arranged therein, so as to maintain the internal and external pressure balance of the feeding bin and the separation bin;

[0013] The upper end of the feeding bin is connected to the funnel outside the high-pressure bin through a feeding pipe, and a feeding valve is installed on one end of the feeding pipe close to the feeding bin;

[0014] A water injection pipe is provided on the top of the high-pressure chamber, and a water injection valve is provided on the water injection pipe;

[0015] The material receiving bin and the tailing bin are both arranged outside the high-pressure bin, the material receiving pipe and the tailing pipe both pass through the bin wall of the high-pressure bin, and the connection parts are sealed.

[0016] As a preferred solution of the present invention, the CO2 input pipe, the high-pressure chamber and the tailing pipe are connected by a three-branched equalization pipe, and the branch pipe end of the equalization pipe connected to the high-pressure chamber is located at the top of the high-pressure chamber;

[0017] The equalizing pipe is provided with a first balancing valve and a second balancing valve at one end close to the CO2 input pipe and the tailing pipe respectively;

[0018] A first working valve is installed on the CO2 input pipe between the equalizing pipe and the feeding pipe, and a second working valve is installed on the tailing pipe downstream of the equalizing pipe;

[0019] Opening the liquid inlet valve, the first balancing valve and the second balancing valve separately can balance the pressure between the high-pressure bin, the separation bin and the feeding bin;

[0020] The second balancing valve and the second working valve are opened separately to release the high pressure in the equalizing pipe and the separation chamber.

[0021] As a preferred solution of the present invention, the high-pressure bin, the separation bin, the material receiving bin, the material adding bin and the pipelines are all arranged in a safety water tank, and the tailings bin is arranged in a draining water tank.

[0022] As a preferred solution of the present invention, a second pressure gauge is installed on the high-pressure chamber to monitor the water pressure in the high-pressure chamber.

[0023] As a preferred solution of the present invention, the feed pipe of the feeding bin is connected to one end of the CO2 input pipe close to the separation bin, and the feeding pipe is connected to one end of the CO2 input pipe away from the separation bin.

[0024] As a preferred solution of the present invention, the CO2 input pipe is connected to a first pressure gauge for monitoring the pressure of the liquid CO2 input during operation.

[0025] As a preferred solution of the present invention, two branch pipes are arranged in the middle of the tailing pipe, an air flow meter is installed on the higher branch pipe, and a water flow meter is installed on the lower branch pipe.

[0026] The present invention also provides a separation method, using the above-mentioned cyclone separation device, comprising the following steps:

[0027] Open the water injection valve and inject water into the high-pressure chamber through the water injection pipe. When the water pressure reaches 9MPa, stop injecting water and close the water injection valve;

[0028] Open the liquid inlet valve, the first balancing valve and the second balancing valve to balance the pressures among the high-pressure chamber 5, the separation chamber (1) and the feeding chamber 4, and close the liquid inlet valve, the first balancing valve and the second balancing valve after the pressures are balanced;

[0029] Open the liquid inlet valve, the first working valve and the second working valve, inject high-pressure liquid CO2 into the separation chamber, and start the separation chamber to perform cyclone separation;

[0030] Open the feeding valve and the feed valve to allow high-pressure liquid CO2 to enter the feeding bin from the feeding pipe, flush the material in the feeding bin into the CO2 input pipe, and help the material enter the separation bin;

[0031] Adjust the opening and closing degree of the feeding valve to control the feeding rate and balance the separation efficiency and separation quality of the separation chamber;

[0032] When the material in the feeding bin is used up, close the feeding valve and the feed valve in turn, vent the high-pressure liquid CO2 in the feeding pipe and the feeding bin, and then open the refilling valve to add material to the feeding bin. After the refilling is completed, close the refilling valve and reopen the feeding valve and the feed valve.

[0033] When the material separation is completed, the other valves except the second balancing valve and the second working valve are closed to vent the high pressure in the equalizing pressure pipe and the separation bin.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] High-pressure liquid CO2 is input into the separation bin through the CO2 input pipe, and the separation bin is started to perform cyclone separation; then high-pressure liquid CO2 is injected into the feeding bin through the feeding pipe to flush the material into the separation bin to avoid the material being unable to enter the separation bin due to excessive pressure in the separation bin. The present invention uses high-pressure liquid CO2 as a separation medium, which has low viscosity and small resistance, and can reduce the difficulty of sorting irregularly shaped material particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0037] Figure 1 This is a schematic diagram of the structure of a cyclone separation device in an embodiment of the present invention;

[0038] Figure 2 Schematic diagram of the valve opening and closing status corresponding to each sorting step of the present invention.

[0039] The numbers in the figure represent the following:

[0040] 1-separation bin, 2-collecting bin, 3-tailing bin, 4-feeding bin, 5-high-pressure bin, 6-CO2 input pipe, 7-liquid inlet valve, 8-feeding pipe, 9-feeding valve, 10-feeding pipe, 11-feeding valve, 12-feeding pipe, 13-funnel, 14-feeding valve, 15-water injection pipe, 16-water injection valve, 17-equalizing pipe, 18-first balancing valve, 19-second balancing valve, 20-first working valve, 21-second working valve, 22-safety water tank, 23-draining water tank, 24-second pressure gauge, 25-first pressure gauge. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The present invention specifically provides a cyclone separation device based on high-pressure liquid CO2, comprising:

[0043] A separation bin 1, which is used to perform cyclone separation on heterogeneous materials, so that the heavy phase migrates downward along the inner wall of the separation bin 1, and the light phase migrates upward from the center of the separation bin 1;

[0044] A material receiving bin 2, connected to the bottom of the separation bin 1 through a material receiving pipe, and used for collecting the heavy phase migrating downward in the separation bin 1;

[0045] A tailings bin 3, connected to the top center of the separation bin 1 through a tailings pipe, and used to collect the light phase migrating upward in the separation bin 1;

[0046] A CO2 input pipe 6 is connected to the separation chamber 1 and is used to input high-pressure liquid CO2 into the separation chamber 1 to reduce the resistance of the separation medium to the material, and a liquid inlet valve 7 is installed on the CO2 input pipe 6;

[0047] A feeding bin 4 is connected to the separation bin 1 through a feeding pipe 10, and a feeding valve 11 is provided on the feeding pipe 10;

[0048] The top of the feeding bin 4 is also connected to the CO2 input pipe 6 through a feeding pipe 8, and a feeding valve 9 is provided on the feeding pipe 8. The feeding pipe 8 can introduce high-pressure liquid CO2 into the feeding bin 4 to help the material in the feeding bin 4 enter the separation bin 1 in a high-pressure state.

[0049] During operation, the liquid inlet valve 7 is opened, and high-pressure liquid CO2 is input into the separation bin 1 through the CO2 input pipe 6, and the separation bin 1 is started to perform cyclone separation; then the feed valve 11 and the feeding valve 9 are opened, and high-pressure liquid CO2 is injected into the feeding bin 4 through the feeding pipe 8 to flush the material into the separation bin 1, so as to avoid the material being unable to enter the separation bin 1 due to excessive pressure in the separation bin 1. The present invention uses high-pressure liquid CO2 as a separation medium, which has low viscosity and small resistance, and can reduce the difficulty of sorting irregularly shaped material particles.

[0050] In addition, the cyclone separation technology is realized based on the density difference, which is generally applicable to the density difference greater than 0.3kg / m 3 When the density difference between the two materials is within 0.3, cyclone separation is more difficult.

[0051] Using high pressure liquid CO2 as separation medium helps to optimize the density difference between the two materials within 0.3 kg / m 3 The sorting effect within .

[0052] Furthermore, the cyclone separation device further comprises a high-pressure bin 5, and the high-pressure bin 5 is used to apply high pressure to the feeding bin 4 and the separation bin 1 arranged therein, so as to maintain the internal and external pressure balance of the feeding bin 4 and the separation bin 1;

[0053] The upper end of the feeding bin 4 is connected to a funnel 13 located outside the high-pressure bin 5 through a feeding pipe 12, and a feeding valve 14 is installed on one end of the feeding pipe 12 close to the feeding bin 4;

[0054] When the material in the feeding bin 4 is used up, the feeding valve 9 and the feed valve 11 are closed successively, the high-pressure liquid CO2 in the feeding pipe 8 and the feeding bin 4 is emptied, and then the refilling valve 14 is opened to refill the material into the feeding bin 4. After the refilling is completed, the refilling valve 14 is closed again, and the feeding valve 9 and the feed valve 11 are reopened, so that the refilling can be realized during the working process, thereby improving the efficiency of the separation work;

[0055] A water injection pipe 15 is provided on the top of the high-pressure chamber 5, and a water injection valve 16 is provided on the water injection pipe 15. Before the separation chamber 1 starts working, water is first injected into the high-pressure chamber 5 through the water injection pipe 15 to create an external high-pressure environment, which offsets the internal high pressure of the subsequent separation chamber 1 and the feeding chamber 4, maintains the internal and external pressure balance, and the pressure of the high-pressure chamber 5 can be transmitted to the feeding chamber 4 and the separation chamber 1, ensuring that the CO2 in the two chambers is liquid;

[0056] The material receiving bin 2 and the tailing bin 3 are both arranged outside the high-pressure bin 5, the material receiving pipe and the tailing pipe both pass through the bin wall of the high-pressure bin 5, and the connections are sealed, and the pipelines inside and outside the high-pressure bin 5 can be connected to the corresponding through holes opened on the high-pressure bin 5 through flanges to achieve sealing.

[0057] Furthermore, the CO2 input pipe 6, the high-pressure chamber 5 and the tailing pipe are connected by a three-branched equalizing pipe 17, and the branch pipe end of the equalizing pipe 17 connected to the high-pressure chamber 5 is located at the top of the high-pressure chamber 5;

[0058] The equalizing pipe 17 is provided with a first balancing valve 18 and a second balancing valve 19 at one end close to the CO2 input pipe 6 and the tailing pipe respectively;

[0059] A first working valve 20 is installed on the CO2 input pipe 6 between the equalizing pipe 17 and the feeding pipe 8, and a second working valve 21 is installed on the tailing pipe downstream of the equalizing pipe 17;

[0060] Opening the liquid inlet valve 7, the first balancing valve 18 and the second balancing valve 19 separately can balance the pressure between the high-pressure bin 5, the separation bin 1 and the feeding bin 4;

[0061] By opening the second balancing valve 19 and the second working valve 21 separately, the high pressure in the equalizing pipe 17 and the separation chamber 1 can be vented.

[0062] Furthermore, the high-pressure bin 5 , the separation bin 1 , the material receiving bin 2 , the material adding bin 4 and the pipelines are all arranged in a safety water pool 22 , and the tailings bin 3 is arranged in a draining water pool 23 .

[0063] Furthermore, a second pressure gauge 24 is installed on the high-pressure chamber 5 to monitor the water pressure in the high-pressure chamber 5 .

[0064] Furthermore, the feeding pipe 10 of the feeding bin 4 is connected to one end of the CO2 input pipe 6 close to the separation bin 1 , and the feeding pipe 8 is connected to one end of the CO2 input pipe 6 away from the separation bin 1 .

[0065] Furthermore, the CO2 input pipe 6 is connected to a first pressure gauge 25 for monitoring the pressure of the liquid CO2 input during operation.

[0066] Furthermore, two branch pipes are arranged in the middle of the tailing pipe, an air flow meter is installed on the higher branch pipe, and a water flow meter is installed on the lower branch pipe.

[0067] The present invention also provides a separation method, using the above-mentioned cyclone separation device, such as Figure 2 As shown (blank means closed), it includes the following steps:

[0068] Add water: open the water injection valve 16, inject water into the high-pressure chamber 5 through the water injection pipe 15, stop injecting water when the water pressure reaches 9MPa, and close the water injection valve 16;

[0069] Balance pressure: open the liquid inlet valve 7, the first balancing valve 18 and the second balancing valve 19 to balance the pressure among the high-pressure bin 5, the separation bin 1 and the feeding bin 4, and close the liquid inlet valve 7, the first balancing valve 18 and the second balancing valve 19 after the pressure is balanced;

[0070] Separation chamber operation: open the liquid inlet valve 7, the first working valve 20 and the second working valve 21, inject high-pressure liquid CO2 into the separation chamber 1, and start the separation chamber 1 to perform cyclone separation;

[0071] Feeding the feeding bin: Open the feeding valve 9 and the feed valve 11 to allow the high-pressure liquid CO2 to enter the feeding bin 4 from the feeding pipe 8, flush the material in the feeding bin 4 into the CO2 input pipe 6, and help the material enter the separation bin 1;

[0072] Adjust the opening and closing degree of the feeding valve 9 to control the feeding rate and balance the separation efficiency and separation quality of the separation chamber 1;

[0073] Feeding bin refilling (this process is not in Figure 2 When the material in the feeding bin 4 is exhausted, the feeding valve 9 and the feed valve 11 are closed successively to discharge the high-pressure liquid CO2 in the feeding pipe 8 and the feeding bin 4;

[0074] Then open the feeding valve 14 to add materials to the feeding bin 4. After the feeding is completed, close the feeding valve 14 and reopen the feeding valve 9 and the feed valve 11.

[0075] Venting: After the separation of materials is completed, close the other valves except the second balancing valve 19 and the second working valve 21 to vent the high pressure in the equalizing pressure pipe 17 and the separation bin 1.

[0076] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A cyclone separation device based on high pressure liquid CO2, characterized in that: include: A separation bin (1), the separation bin (1) being used to perform cyclone separation on heterogeneous materials, so that the heavy phase migrates downward along the inner wall of the separation bin (1) and the light phase migrates upward from the center of the separation bin (1); A material receiving bin (2) connected to the bottom of the separation bin (1) via a material receiving pipe, and used for collecting the heavy phase migrating downward in the separation bin (1); A tailings bin (3), connected to the center of the top of the separation bin (1) via a tailings pipe, and used to collect the light phase migrating upward in the separation bin (1); A CO2 input pipe (6) connected to the separation chamber (1) and used for inputting high-pressure liquid CO2 into the separation chamber (1) to reduce the resistance of the separation medium to the material, and a liquid inlet valve (7) is installed on the CO2 input pipe (6); A feeding bin (4) is connected to the separation bin (1) via a feeding pipe (10), and a feeding valve (11) is provided on the feeding pipe (10); The top of the feeding bin (4) is also connected to the CO2 input pipe (6) via a feeding pipe (8), and a feeding valve (9) is provided on the feeding pipe (8). The feeding pipe (8) can introduce high-pressure liquid CO2 into the feeding bin (4) to help the material in the feeding bin (4) enter the high-pressure separation bin (1).

2. A cyclone separation device based on high pressure liquid CO2 according to claim 1, characterized in that: The cyclone separation device further comprises a high-pressure bin (5), wherein the high-pressure bin (5) is used to apply high pressure to the feeding bin (4) and the separation bin (1) arranged therein, so as to maintain the internal and external pressure balance of the feeding bin (4) and the separation bin (1); The upper end of the feeding bin (4) is connected to a funnel (13) located outside the high-pressure bin (5) via a feeding pipe (12), and a feeding valve (14) is installed on one end of the feeding pipe (12) close to the feeding bin (4); A water injection pipe (15) is provided on the top of the high-pressure chamber (5), and a water injection valve (16) is provided on the water injection pipe (15); The material receiving bin (2) and the tailing bin (3) are both arranged outside the high-pressure bin (5), the material receiving pipe and the tailing pipe both pass through the bin wall of the high-pressure bin (5), and the connection is sealed.

3. A cyclone separation device based on high pressure liquid CO2 according to claim 2, characterized in that: The CO2 input pipe (6), the high-pressure chamber (5) and the tailing pipe are connected via a three-branched equalizing pipe (17), and the branch pipe end on the equalizing pipe (17) connected to the high-pressure chamber (5) is located at the top of the high-pressure chamber (5); The equalizing pipe (17) is provided with a first balancing valve (18) and a second balancing valve (19) at one end close to the CO2 input pipe (6) and the tailing pipe respectively; A first working valve (20) is installed on the CO2 input pipe (6) between the equalizing pipe (17) and the feeding pipe (8), and a second working valve (21) is installed on the tailing pipe downstream of the equalizing pipe (17); Opening the liquid inlet valve (7), the first balancing valve (18) and the second balancing valve (19) individually can balance the pressure between the high-pressure bin (5), the separation bin (1) and the feeding bin (4); By opening the second balancing valve (19) and the second working valve (21) separately, the high pressure in the equalizing pipe (17) and the separation chamber (1) can be vented.

4. A cyclone separation device based on high pressure liquid CO2 according to claim 3, characterized in that: The high-pressure bin (5), the separation bin (1), the material collection bin (2), the material feeding bin (4) and the pipelines are all arranged in a safety water pool (22), and the tailing bin (3) is arranged in a draining water pool (23).

5. A cyclone separation device based on high pressure liquid CO2 according to claim 2, characterized in that: A second pressure gauge (24) is installed on the high-pressure chamber (5) for monitoring the water pressure in the high-pressure chamber (5).

6. A cyclone separation device based on high pressure liquid CO2 according to claim 1, characterized in that: The feed pipe (10) of the feeding bin (4) is connected to one end of the CO2 input pipe (6) close to the separation bin (1), and the feed pipe (8) is connected to one end of the CO2 input pipe (6) away from the separation bin (1).

7. A cyclone separation device based on high pressure liquid CO2 according to claim 1, characterized in that: The CO2 input pipe (6) is connected to a first pressure gauge (25) for monitoring the pressure of the liquid CO2 input during operation.

8. A cyclone separation device based on high pressure liquid CO2 according to claim 1, characterized in that: Two branch pipes are arranged in the middle of the tailing pipe, an air flow meter is installed on the higher branch pipe, and a water flow meter is installed on the lower branch pipe.

9. A sorting method, characterized in that: Using the cyclone separation device according to any one of claims 3 to 8 comprises the following steps: Open the water injection valve (16), inject water into the high-pressure chamber (5) through the water injection pipe (15), stop injecting water when the water pressure reaches 9 MPa, and close the water injection valve (16); Opening the liquid inlet valve (7), the first balancing valve (18) and the second balancing valve (19) to balance the pressures among the high-pressure bin (5), the separation bin (1) and the feeding bin (4); and closing the liquid inlet valve (7), the first balancing valve (18) and the second balancing valve (19) after the pressures are balanced; Open the liquid inlet valve (7), the first working valve (20) and the second working valve (21), inject high-pressure liquid CO2 into the separation chamber (1), and start the separation chamber (1) to perform cyclone separation; Open the feeding valve (9) and the feed valve (11) to allow the high-pressure liquid CO2 to enter the feeding bin (4) from the feeding pipe (8), flush the material in the feeding bin (4) into the CO2 input pipe (6), and help the material enter the separation bin (1); Adjusting the opening and closing degree of the feeding valve (9) to control the feeding rate and balance the separation efficiency and separation quality of the separation chamber (1); When the material in the feeding bin (4) is exhausted, the feeding valve (9) and the feed valve (11) are closed successively, the high-pressure liquid CO2 in the feeding pipe (8) and the feeding bin (4) is emptied, and then the refilling valve (14) is opened to refill the material in the feeding bin (4). After the refilling is completed, the refilling valve (14) is closed again, and the feeding valve (9) and the feed valve (11) are reopened; When the material separation is completed, all valves except the second balancing valve (19) and the second working valve (21) are closed to discharge the high pressure in the equalizing pressure pipe (17) and the separation bin (1).

Images