A swirl sorting device and sorting method based on high-pressure liquid CO2

Abstract

The present invention discloses a cyclone separation device and a separation method based on high-pressure liquid CO2 in the field of cyclone separation technology, comprising: a separation chamber for cyclone separating heterogeneous materials, enabling the heavy phase to migrate downward along the inner wall of the separation chamber and the light phase to migrate upward from the center of the separation chamber; a receiving bin connected to the lower part of the separation chamber through a receiving pipe for collecting the heavy phase migrating downward in the separation chamber; a tailing bin connected to the center of the top of the separation chamber through a tailing pipe for collecting the light phase migrating upward in the separation chamber; a CO2 input pipe connected to the separation chamber for inputting high-pressure liquid CO2 into the separation chamber to reduce the resistance of the separation medium to the materials, and a liquid inlet valve is installed on the CO2 input pipe; a feeding bin communicated with the separation chamber through a feeding pipe, and a feeding valve is arranged on the feeding pipe; the top of the feeding bin is also 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 particularly relates 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 separates a heterogeneous mixture using the principle of centrifugal sedimentation. As a typical non-thermal physical separation method, cyclone separation mainly utilizes 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-phase or multi-phase with density differences at different positions in the radial direction of the cyclone. The heavy phase migrates towards the sidewall of the cyclone and finally discharges from the underflow port, while the light phase migrates towards the center of the cyclone and finally discharges from the overflow pipe, thereby realizing the separation of the heterogeneous mixture.

[0003] However, when the shape of the material particles is irregular, especially flaky, the resistance of the material particles in water will become larger, increasing the difficulty of separation. Summary of the Invention

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

[0005] To solve the above technical problem, a cyclone separation device based on high-pressure liquid CO2 includes:

[0006] A separation chamber for cyclone separating a heterogeneous material, enabling the heavy phase to migrate downward along the inner wall of the separation chamber and the light phase to migrate upward from the center of the separation chamber;

[0007] A material receiving chamber connected to the lower part of the separation chamber through a material receiving pipe for collecting the heavy phase migrating downward in the separation chamber;

[0008] A tailing chamber connected to the center of the top of the separation chamber through a tailing pipe for collecting the light phase migrating upward in the separation chamber;

[0009] A CO2 input pipe connected to the separation chamber for inputting 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 chamber communicated with the separation chamber through a feeding pipe, and a feeding valve is provided on the feeding pipe;

[0011] The top of the feeding bin is also communicated with the CO2 input pipe through a feeding pipe, and a feeding valve is arranged on the feeding pipe. The feeding pipe can introduce high-pressure liquid CO2 into the feeding bin to help the materials 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 includes a high-pressure chamber, which is used to apply high pressure to the feeding bin and the separation bin arranged therein 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 a funnel located outside the high-pressure chamber through a replenishing pipe, and a replenishing valve is installed at one end of the replenishing pipe close to the feeding bin;

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

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

[0016] As a preferred embodiment of the present invention, the CO2 input pipe, the high-pressure chamber and the tailing pipe are connected through a three-way pressure equalizing pipe. The end of the branch pipe of the pressure equalizing pipe connected to the high-pressure chamber is located at the top of the high-pressure chamber;

[0017] A first balance valve and a second balance valve are respectively arranged at one end of the pressure equalizing pipe close to the CO2 input pipe and the tailing pipe;

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

[0019] Opening the liquid inlet valve, the first balance valve and the second balance valve alone can balance the pressures among the high-pressure chamber, the separation chamber and the feeding chamber;

[0020] Opening the second balance valve and the second working valve alone can release the high pressure in the pressure equalizing pipe and the separation chamber.

[0021] As a preferred embodiment of the present invention, the high-pressure chamber, the separation chamber, the receiving chamber, the feeding chamber and each pipeline are all arranged in a safety water pool, and the tailing bin is arranged in a blowdown water pool.

[0022] As a preferred embodiment 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 embodiment of the present invention, the feed pipe of the feed bin is connected to one end of the CO2 input pipe close to the separation bin, and the feed pipe is connected to the other end of the CO2 input pipe far from the separation bin.

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

[0025] As a preferred embodiment of the present invention, two branch pipes are provided in the middle of the tailing pipe, a gas flowmeter is installed on the higher branch pipe, and a water flowmeter is installed on the lower branch pipe.

[0026] The present invention also provides a sorting method using the above cyclone sorting device, which includes the following steps:

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

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

[0029] Open the liquid inlet valve, the first working valve and the second working valve, inject high-pressure liquid CO2 into the separation bin, and start the cyclone separation work of the separation bin;

[0030] Open the feeding valve and the feed valve, so that the high-pressure liquid CO2 enters the feed bin from the feed pipe, and flushes the materials in the feed bin into the CO2 input pipe to help the materials enter the separation bin;

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

[0032] When the materials in the feed bin are used up, close the feeding valve and the feed valve successively, empty the high-pressure liquid CO2 in the feed pipe and the feed bin, then open the replenishing valve to replenish materials into the feed bin. After the replenishment is completed, close the replenishing valve, and reopen the feeding valve and the feed valve;

[0033] When the material separation is completed, close all valves except the second balance valve and the second working valve, and release the high pressure in the pressure equalizing pipe and the separation bin.

[0034] The present invention has the following beneficial effects compared with the prior art:

[0035] Input high-pressure liquid CO2 into the separation chamber through the CO2 input pipe, and start the separation chamber to carry out cyclone separation work; then inject high-pressure liquid CO2 into the feeding chamber through the feeding pipe, and flush the material into the separation chamber to prevent the material from being unable to enter the separation chamber due to excessive pressure in the separation chamber. The present invention uses high-pressure liquid CO2 as the separation medium, which has low viscosity and small resistance, and can reduce the sorting difficulty of irregularly shaped material particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0037] Figure 1 It is a schematic structural diagram of the cyclone separation device in the embodiment of the present invention;

[0038] Figure 2 It is a schematic diagram of the opening and closing states of the valves corresponding to each sorting step of the present invention.

[0039] The reference numerals in the drawings are respectively represented as follows:

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

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

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

[0043] A separation chamber 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 chamber 1, and the light phase migrates upward from the center of the separation chamber 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 the funnel 13 located outside the high-pressure bin 5 through a replenishing pipe 12, and a replenishing valve 14 is installed at one end of the replenishing pipe 12 close to the feeding bin 4;

[0054] When the materials in the feeding bin 4 are exhausted, first close the feeding valve 9 and the feeding inlet valve 11, empty the high-pressure liquid CO2 in the feeding pipe 8 and the feeding bin 4, then open the replenishing valve 14 to replenish materials into the feeding bin 4. After the replenishment is completed, close the replenishing valve 14 again, and reopen the feeding valve 9 and the feeding inlet valve 11, so that replenishment can be carried out during the working process, improving the efficiency of the separation work;

[0055] A water injection pipe 15 is provided at the top of the high-pressure bin 5, and a water injection valve 16 is provided on the water injection pipe 15. Before the separation bin 1 starts to work, first inject water into the high-pressure bin 5 through the water injection pipe 15 to create an external high-pressure environment, which offsets the internal high pressure of the subsequent separation bin 1 and the feeding bin 4, maintaining the internal and external pressure balance. And the pressure of the high-pressure bin 5 can be transmitted to the feeding bin 4 and the separation bin 1 to ensure that the CO2 in the two bins is in a liquid state;

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

[0057] Further, the CO2 input pipe 6, the high-pressure bin 5 and the tailing pipe are connected through a three-way equalizing pipe 17. The end of the branch pipe of the equalizing pipe 17 connected to the high-pressure bin 5 is located at the top of the high-pressure bin 5;

[0058] A first balance valve 18 and a second balance valve 19 are respectively arranged at one end of the equalizing pipe 17 close to the CO2 input pipe 6 and the tailing pipe;

[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 balance valve 18 and the second balance valve 19 separately can balance the pressures among the high-pressure bin 5, the separation bin 1 and the feeding bin 4;

[0061] Opening the second balance valve 19 and the second working valve 21 separately can empty the high pressure in the equalizing pipe 17 and the separation bin 1.

[0062] Further, the high-pressure chamber 5, the separation chamber 1, the material receiving chamber 2, the feeding chamber 4 and each pipeline are arranged in the safety water pool 22, and the tailing chamber 3 is arranged in the venting water pool 23.

[0063] Further, a second pressure gauge 24 is installed on the high-pressure chamber 5 for monitoring the water pressure in the high-pressure chamber 5.

[0064] Further, the feed pipe 10 of the feeding chamber 4 is connected to one end of the CO2 input pipe 6 close to the separation chamber 1, and the feeding pipe 8 is connected to the other end of the CO2 input pipe 6 far from the separation chamber 1.

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

[0066] Further, two branch pipelines are arranged in the middle of the tailing pipe, a gas flowmeter is installed on the higher branch pipeline, and a water flowmeter is installed on the lower branch pipeline.

[0067] The present invention also provides a sorting method, using the above-mentioned cyclone sorting device, as Figure 2 shown (the blank ones indicate closed), including the following steps:

[0068] Adding 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 9 MPa, and close the water injection valve 16;

[0069] Balancing pressure: Open the liquid inlet valve 7, the first balancing valve 18 and the second balancing valve 19 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 7, the first balancing valve 18 and the second balancing valve 19 after balancing;

[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 cyclone separation operation of the separation chamber 1;

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

[0072] Adjust the opening 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] Refilling the feeding chamber (this process is not shown in Figure 2 ): When the materials in the feeding chamber 4 are used up, close the feeding valve 9 and the feed valve 11 successively, and empty the high-pressure liquid CO2 in the feeding pipe 8 and the feeding chamber 4;

[0074] Then open the feeding valve 14 again to supplement materials into the feeding bin 4. After the feeding is completed, close the feeding valve 14, and then reopen the feeding valve 9 and the inlet valve 11.

[0075] Emptying: When the material separation is completed, close all valves except the second balance valve 19 and the second working valve 21 to empty the high pressure in the pressure equalizing pipe 17 and the separation chamber 1.

[0076] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling 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) is connected to the bottom of the separation bin (1) via a material receiving pipe and is used to collect the heavy phase migrating downward in the separation bin (1); A tailings bin (3) connected to the top center 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 separation bin (1) in a high-pressure state; The cyclone separation device further comprises a high-pressure chamber (5), wherein the high-pressure chamber (5) is used to apply high pressure to the feeding chamber (4) and the separation chamber (1) arranged therein, so as to maintain a balance between the internal and external pressures of the feeding chamber (4) and the separation chamber (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 at 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; 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).

2. A cyclone separation device based on high pressure liquid CO2 according to claim 1, 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 chamber (5), the separation chamber (1) and the feeding chamber (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.

3. A cyclone separation device based on high pressure liquid CO2 according to claim 1, characterized in that: The high-pressure chamber (5) is provided with a second pressure gauge (24) for monitoring the water pressure in the high-pressure chamber (5).

4. A cyclone separation device based on high pressure liquid CO2 according to claim 1, characterized in that: The feed pipe (10) of the feed 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).

5. 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.

6. 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.

7. A sorting method, characterized in that: Using the cyclone separation device according to claim 2 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 chamber (5), the separation chamber (1) and the feeding chamber (4); and closing the liquid inlet valve (7), the first balancing valve (18) and the second balancing valve (19) after the pressures are balanced; Opening the liquid inlet valve (7), the first working valve (20) and the second working valve (21), injecting high-pressure liquid CO2 into the separation chamber (1), and starting 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 in turn, the high-pressure liquid CO2 in the feeding pipe (8) and the feeding bin (4) is vented, and 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, and the high pressure in the equalizing pressure pipe (17) and the separation bin (1) is vented.

Images