Sample separation device

Abstract

The present invention relates to a material separation device and discloses a sample separation device, comprising a separation tank (1) and a demisting device (2) arranged on the upper part of the separation tank (1); the separation tank (1) comprises a separation tank shell (11) formed with a separation cavity, a feeding device (12) arranged on the separation tank side wall of the separation tank shell (11), and a discharge port (13) arranged at the bottom of the separation tank shell (11); the separation tank side wall is a curved surface structure, and the discharge direction of the feeding device (12) is tangent to the separation tank side wall; the upper part of the separation tank shell (11) is connected to the demisting device (2); the demisting device (2) comprises a demisting pipe (21) and a demisting structure (22) arranged in the demisting pipe (21); a ventilation gap is formed in the demisting structure, and the ventilation gap gradually decreases from the air inlet end to the air outlet end of the demisting device (2). The sample separation device of the present invention has low energy consumption and high sample separation purity.

Description

Technical Field

[0001] The present invention relates to a substance separation device, in particular to a sample separation device. Background Art

[0002] With the continuous improvement of process production technology requirements in the chemical industry, online analytical instruments are being used more and more widely in the modern petrochemical industry, coal chemical industry and fine chemical industry. At the same time, with the gradual improvement of the automation level of chemical production processes, production operators are becoming more and more dependent on online analytical data, which requires online analytical instruments to operate stably and the analytical data to be true and reliable.

[0003] However, due to the particularity of most process media (high temperature, high pressure, oil, water, impurities, etc.), the measuring sensor elements of most online analyzers are not directly installed in the process pipelines and equipment. The samples to be analyzed need to be extracted from the process pipelines or process equipment and transmitted to the matching sample processing system for impurity removal before sample analysis and measurement.

[0004] The sample separation devices in the prior art often need to use external force to separate the samples, so more enabling devices are required, which makes the structure of the entire sample separation device complex, which not only increases the manufacturing cost of the sample separation device, but also increases the overall failure rate of the sample separation device, making the maintenance cycle of the sample separation device shorter and the maintenance cost higher; in addition, the sample separation devices in the prior art are usually only equipped with a primary separation device, which has a poor separation effect on the sample, and is still easy to make the subsequent monitoring device contaminated and interfered by impurities in the sample, resulting in low monitoring accuracy, and the monitoring device needs to be cleaned or replaced regularly, and the maintenance and use costs are high.

[0005] In view of this, it is necessary to provide a sample separation device. Summary of the Invention

[0006] The present invention provides a sample separation device with low energy consumption and high purity of separated samples.

[0007] To achieve the above-mentioned purpose of the invention, the present invention provides a sample separation device, comprising a separation tank and a defogger device provided on the upper part of the separation tank; the separation tank comprises a separation tank shell forming a separation chamber, a feeding device provided on the separation tank side wall of the separation tank shell, and a discharge port provided at the bottom of the separation tank shell, the separation tank side wall is a curved structure, and the discharge direction of the feeding device is tangent to the separation tank side wall, the upper part of the separation tank shell is connected to the defogger device, the defogger device comprises a defogger pipe and a defogger structure provided in the defogger pipe, a ventilation gap is formed in the defogger structure, and the ventilation gap gradually decreases from the air inlet end to the air outlet end of the defogger device.

[0008] Preferably, the separation tank shell is configured as a cylindrical structure or a conical structure that is wide at the top and narrow at the bottom; or the upper part of the separation tank shell is configured as a cylindrical structure, and the lower part is configured as a conical structure that is wide at the top and narrow at the bottom.

[0009] Specifically, a spiral downward separation chamber guide structure is provided on the inner side of the separation tank shell. The separation chamber guide structure is a guide plate. One side of the guide plate is connected to the separation tank shell, and the other side is inclined upward to form a separation chamber guide groove structure with the separation tank shell.

[0010] Preferably, the feeding device is a feeding pipe, the cross section of the feeding pipe is set to be smaller as it is closer to the discharge end of the feeding pipe, and the cross section of the feeding pipe at the discharge end is set to be larger in the vertical direction than in the horizontal direction.

[0011] Further preferably, the upper end of the guide plate is connected to the upper part of the discharge end, the spacing of the spiral arrangement of the guide plate is consistent with the vertical dimension of the discharge end of the pipe, and the horizontal distance between the side of the guide plate away from the side wall of the separation chamber and the side wall of the chamber is greater than or equal to the horizontal dimension of the discharge end of the pipe.

[0012] Furthermore, the separation tank shell also includes a separation chamber top plate connected to the side wall of the separation tank, and a demister connection port is provided in the middle of the separation chamber top plate to connect to the demister through the demister connection port.

[0013] Preferably, the inner surface of the connection between the defogger device connection port and the defogger device is formed into a conical surface structure that is narrow at the top and wide at the bottom.

[0014] Furthermore, the demisting structure is a metal demisting device.

[0015] Specifically, the metal demisting structure is a wire braider, and the wire braiding structure includes a U-shaped structural unit and a V-shaped structural unit. The U-shaped structural unit is connected to the V-shaped structural unit by connecting any U-shaped structural unit connection end on the upper part with any V-shaped structural unit connection end on the upper part of the V-shaped structural unit. Multiple U-shaped structural units and V-shaped structural units are arranged to be alternately connected to form a wire braiding chain, and multiple U-shaped structural units and V-shaped structural units are arranged to be staggered and inclined in front and back so as to form multiple hanging structures in the wire braiding chain; each V-shaped structural unit in the wire braiding chain of the second layer and each U-shaped structural unit in the wire braiding chain of the first layer are hung on the U-shaped structural unit of the first layer through a hanging structure, and multiple layers of the wire braiding chains are hung to form a wire braiding mesh; the wire braiding mesh is curled with the hanging direction of multiple wire braiding chains as the curling axis to form a multi-layer tubular demisting structure with the ventilation gap.

[0016] Preferably, the demisting structure in the demisting device is provided with a plurality of structures, and the sizes of the U-shaped structural unit and the V-shaped structural unit in the demisting structure closer to the outlet end of the demisting pipe are smaller, so that the ventilation gap of the demisting structure closer to the outlet end of the demisting pipe is smaller.

[0017] The sample separation device provided by the present invention includes a separation tank and a demisting device, wherein the separation tank side wall of the separation tank is set to a curved surface structure, and the discharge direction of the feed port is set to be tangent to the separation tank side wall. This design enables the sample entering the separation chamber to spirally rotate along the separation tank side wall to form a vortex, thereby automatically generating a centrifugal force that can be used to separate impurities, so that in the sample separation tank of the present invention, there is no need to add an energizing device to provide power for the sample rotation. Therefore, the sample separation device of the present invention can be simple in structure and low in manufacturing cost, and the overall failure rate of the sample separation device of the present invention can be low; and the demisting device set in the demisting device The mist structure can separate the liquid phase substances in the gas-liquid mixture entering the demisting device, so that the final gas phase sample is of higher purity and drier, thereby reducing the interference and pollution of the gas phase sample to the monitoring device, and the ventilation gap in the demisting structure is set to gradually decrease from the air inlet end to the air outlet end of the demisting device. Since solid phase and liquid phase impurities with a large viscosity coefficient are generally separated first during the demisting process, this design can make the ventilation gap of the demisting structure at the air inlet end absorb more solid phase and liquid phase impurities with a large viscosity coefficient, thereby not easily causing the demisting structure to be blocked and fail, and extending the maintenance cycle of the demisting structure. The combination of the above designs can realize multi-stage separation of the sample input into the sample separation device, thereby obtaining a gas phase sample with higher purity, so that when the subsequent monitoring device monitors the gas phase sample, the amount of impurities in the gas phase sample that can adhere to the monitoring device is extremely small, thereby reducing the interference and wear of the impurities on the monitoring device, making the measurement data of the monitoring device more accurate, and greatly extending the maintenance cycle and service life of the monitoring device.

[0018] Other features and advantages of the embodiments of the present invention will be described in detail in the following specific embodiment section. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a front view of the sample separation device of the present invention;

[0020] Figure 2 It is a left side view of the sample separation device of the present invention;

[0021] Figure 3 is a top view of the sample separation device of the present invention;

[0022] Figure 4 yes Figure 3 Cross-sectional view along the AA direction (excluding the demisting structure);

[0023] Figure 5 is a top view of the internal structure of the separation chamber in the sample separation device of the present invention;

[0024] Figure 6yes Figure 4 A schematic diagram of the structure of part B in the middle;

[0025] Figure 7 It is a schematic structural diagram of a metal wire braided chain in a sample separation device of the present invention;

[0026] Figure 8 is a schematic structural diagram of a metal wire braided chain in a sample separation device of the present invention from another perspective;

[0027] Figure 9 This is a schematic structural diagram of a metal wire mesh in the sample separation device of the present invention;

[0028] Figure 10 This is another structural schematic diagram of the metal wire mesh in the sample separation device of the present invention.

[0029] Description of Reference Numerals

[0030] 1-Separation tank 11-Separation tank shell

[0031] 111-Separation chamber guide structure 112-Separation chamber guide groove structure

[0032] 113-Separation chamber top plate 12-Feeding device

[0033] 13-Discharge port 2-Demisting device

[0034] 21-Discharge pipe 211-Discharge pipe diversion structure

[0035] 22- Demisting structure 221- U-shaped structural unit

[0036] 2211-U-shaped structural unit connection end 222-V-shaped structural unit

[0037] 2221-V-shaped structural unit connection end 223-hook structure DETAILED DESCRIPTION

[0038] The following describes the specific implementation of the embodiment of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiment of the present invention and is not used to limit the embodiment of the present invention.

[0039] First, it should be noted that, unless otherwise specified or limited, the terms "installed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0040] like Figure 1 As shown, in an embodiment of the sample separation device provided by the present invention, the sample separation device includes a separation tank 1 and a demisting device 2 provided on the upper part of the separation tank 1; the separation tank 1 includes a separation tank shell 11 forming a separation chamber, a feeding device 12 provided on the separation tank side wall of the separation tank shell 11, and a discharge port 13 provided at the bottom of the separation tank shell 11, the separation tank side wall is a curved structure, and the discharge direction of the feeding device 12 is tangent to the separation tank side wall, the upper part of the separation tank shell 11 is connected to the demisting device 2, the demisting device 2 includes a demisting pipe 21 and a demisting structure 22 provided in the demisting pipe 21, a ventilation gap is formed in the demisting structure, and the ventilation gap gradually decreases from the air inlet end to the air outlet end of the demisting device 2; the sample enters the separation chamber through the feeding device 12, the sample rotates in the separation chamber 11 to separate the gas phase sample and impurities, the impurities are discharged through the discharge port 13, the gas phase sample forms an ascending vortex and enters the demisting device 2, and is discharged after being demisted by the demisting structure 22.

[0041] The above technical solution is to set the side wall of the separation tank 1 to a curved surface structure, and set the discharge direction of the feed port 12 to be tangent to the side wall of the separation tank. This design can make the sample entering the separation chamber spirally rotate along the side wall of the separation tank to form a vortex, thereby generating centrifugal force that can be used to separate impurities. Therefore, in the sample separation tank 1 of the present invention, there is no need to set an energizing device to provide power for the sample rotation, so that the sample separation device of the present invention can be simple in structure and low in manufacturing cost, and the overall failure rate of the sample separation device of the present invention can be low; and the demisting structure 22 provided in the demisting device 2 can enter the demisting device 2 The liquid phase substances in the gas-liquid mixture are separated, so that the final gas phase sample is of higher purity and drier, so that the gas phase sample can interfere with and pollute the subsequent monitoring device less, and the ventilation gap in the demisting structure 22 is set to gradually decrease from the air inlet end to the air outlet end of the demisting device. Since solid phase and liquid phase impurities with a large viscosity coefficient are generally separated out first during the demisting process, this design can make the ventilation gap of the demisting structure 22 at the air inlet end absorb more solid phase and liquid phase impurities with a large viscosity coefficient, so that it is not easy to cause the demisting structure 22 to be blocked and fail, and extend the maintenance cycle of the demisting structure 22. The combination of the above designs can realize multi-stage separation of the sample input into the sample separation device, so as to obtain a gas phase sample with higher purity, so that when the subsequent monitoring device monitors the gas phase sample, the amount of impurities in the gas phase sample that can adhere to the monitoring device is extremely small, thereby reducing the interference and wear of the impurities on the monitoring device, and greatly extending the maintenance cycle and service life of the monitoring device.

[0042] Specifically, in one embodiment of the sample separation device provided by the present invention, the separation tank shell 11 is configured as a cylindrical structure or a conical structure that is wide at the top and narrow at the bottom; or as shown in the figure, the upper part of the separation tank shell 11 is preferably configured as a cylindrical structure, and the lower part is configured as a conical structure that is wide at the top and narrow at the bottom. Setting the separation tank shell 11 to a cylindrical structure can facilitate the sample to spiral downward along the side wall of the separation tank, and can ensure that the direction of the sample changes smoothly during the spiral downward process, and turbulence is not easily generated, thereby ensuring the stability of the rotational separation; and in the process of rotational separation, the more the sample moves toward the lower part of the separation chamber, the less the content of effective gas phase sample therein. Therefore, the separation tank shell 11 can be set to a conical structure that is wide at the top and narrow at the bottom, so that when the sample rotates downward and the overall volume (content of gas phase sample) gradually decreases, it can also ensure a speed (flow rate) that is basically consistent with the initial speed of entering the separation chamber, so that the sample has sufficient centrifugal force to separate impurities when it reaches the bottom of the separation chamber, so as to ensure the effect of sample separation; of course, it is understandable that it is also preferred to set the upper part of the separation tank shell 11 to a cylindrical structure and the lower part to a conical structure that is wide at the top and narrow at the bottom, so as to ensure both the stability of the rotational separation and the good effect of sample separation.

[0043] Furthermore, in one embodiment of the sample separation device provided by the present invention, a spiral downward separation chamber guide structure 111 may be provided on the inner side of the separation tank shell 11. The separation chamber guide structure 111 may be a spiral downward groove structure embedded in the side wall of the separation tank (the inner side of the separation tank shell 11) to guide the separated impurities and facilitate the impurities to flow quickly to the discharge port 13 for discharge; or Figures 4 to 6As shown, the separation chamber guide structure 111 can be preferably designed as a guide plate, one side of which is connected to the separation tank shell 11, and the other side is preferably tilted upward to form a separation chamber guide groove structure 112 with the separation tank shell 11. Setting a spiral downward separation chamber guide structure 111 can guide the sample entering the separation chamber, and can facilitate the sample to rotate downward along the set path, that is, the number of turns (number of turns) set by the guide plate can be controlled to ensure that the sample has sufficient rotational separation time, thereby ensuring the effect of rotational separation; and the other side of the guide plate is tilted upward so that the connection between the guide plate and the separation tank shell 11 forms a separation chamber guide groove structure 112. On the one hand, setting the other side of the guide plate tilted upward can facilitate the gas phase sample to flow upward into the demisting device 2, thereby facilitating the separation of the gas phase sample and impurities, and the separated impurities can flow to the discharge port 13 more quickly and discharge the separation chamber through the drainage effect of the separation chamber guide groove structure 112 and the blowing effect of the sample itself, and this design can make the impurities stay on the side wall of the separation tank (inner wall of the separation chamber) for a shorter time, which is better than preventing impurities, especially some liquid phase impurities that are more volatile, from entering the sample again, thereby improving the separation effect of impurities.

[0044] Furthermore, in one embodiment of the sample separation device provided by the present invention, Figure 2 As shown, the feeding device 12 can be a feeding pipe, and the cross-section of the feeding pipe can preferably be set to be smaller the closer to the discharge end of the feeding pipe, and the cross-section of the feeding pipe at the discharge end can be further preferably set to have a vertical dimension larger than a horizontal dimension. The cross-section of the feed pipe is preferably set to a smaller area the closer to the discharge end of the feed pipe. This design can make the speed of the sample when entering the separation chamber greater than the speed of the sample when entering the feed pipe, so that the initial velocity of the sample when entering the separation chamber is higher, thereby making the centrifugal force generated during rotational separation greater, and achieving better rotational separation effect; and the cross-section of the feed pipe at the discharge end is set to a vertical dimension larger than a horizontal dimension, so that the distance between the sample entering the separation chamber and the side wall of the separation tank (inner wall of the separation chamber) as a whole can be relatively small, so that the side wall of the separation tank can have a better guiding effect on the sample, and it is not easy for some samples to move away from the side wall of the separation tank and be less affected by the guidance of the side wall of the separation tank, so that the flow velocity decreases rapidly, and effective rotational separation cannot be carried out, resulting in an unsatisfactory rotational separation effect; it can be understood that the cross-section of the feed pipe can be further preferably designed to be rectangular, so that the sample entering the separation chamber can better flow close to the side wall of the separation tank.

[0045] Furthermore, in one embodiment of the sample separation device provided by the present invention, the upper end of the guide plate is connected to the upper part of the discharge end, and the spacing of the spiral arrangement of the guide plate is preferably designed to be consistent with the size of the pipe discharge end in the vertical direction, and as Figure 5 As shown, the horizontal distance between the side of the guide plate away from the side wall of the separation chamber and the side wall of the chamber is preferably set to be greater than or equal to the horizontal dimension of the pipe discharge end. This design enables the guide plate to not only guide the sample being guided, but also has a certain restraining and gathering effect, so that the sample can be better rotated and separated against the side wall of the separation chamber, thereby preventing the sample from escaping away from the side wall of the separation chamber, rapidly reducing the flow rate, resulting in unseparated or incomplete separation, and entering the demisting device 2 driven by the rising vortex, thereby seriously affecting the separation effect.

[0046] Furthermore, in one embodiment of the sample separation device provided by the present invention, the separation tank shell 11 also includes a separation chamber top plate 113 connected to the side wall of the separation tank, and a demister connection port is provided in the middle of the separation chamber top plate 113 to connect to the demister 2 through the demister connection port. After the sample enters the separation chamber, the unseparated or incompletely separated samples are subjected to rotational separation on the outside of the separation chamber (i.e., the part close to the side wall of the separation tank), and the fully separated samples (i.e., gaseous samples) will form an ascending vortex in the middle of the separation chamber. Therefore, the demister connection port is provided in the middle of the separation chamber top plate 113, which can facilitate the spirally ascending gaseous samples to enter the demister 2, and can block the unseparated or incompletely separated samples flowing on the outside of the separation chamber to prevent them from entering the demister 2; and as Figure 1 and Figure 4 As shown, the inner surface of the connection between the defogger device connection port and the defogger device 2 is formed into a conical surface structure that is narrow at the top and wide at the bottom. This structure can reasonably expand the collection range of the gaseous samples, making it convenient for the gaseous samples to enter the defogger 2. The conical surface structure that is narrow at the top and wide at the bottom can make the process of the gaseous samples gathering and shrinking when entering the defogger 2 smoother, and is less likely to cause turbulence or even the gaseous samples to flow back into the separation chamber, bringing the unseparated or incompletely separated samples in the separation chamber into the defogger 2, thereby ensuring the separation effect.

[0047] Furthermore, in one embodiment of the sample separation device provided by the present invention, the demisting structure 22 is a metal demisting device. Since the metal material has a fast heat conduction, it is convenient for small droplets suspended in the gas phase sample or substances with a higher boiling point to contact or adhere to the metal demisting structure, and then condense or further converge to form larger droplets, so as to separate liquid phase impurities. The metal material has good stability, which can make the demisting structure 22 have a long service life, and the metal demisting device can preferably be set as a metal wire braided structure, specifically, as Figure 7As shown, the wire braided structure includes a U-shaped structure unit 221 and a V-shaped structure unit 222. The U-shaped structure unit 221 is connected to the V-shaped structure unit 222 by connecting any U-shaped structure unit connection end 2211 on the upper part of the U-shaped structure unit 221 with any V-shaped structure unit connection end 2221 on the upper part of the V-shaped structure unit 222. The U-shaped structure unit 221 and the V-shaped structure unit 222 are arranged to be alternately connected to form a wire braided chain, and as shown in FIG. Figure 8 As shown, a plurality of U-shaped structural units 221 and V-shaped structural units 222 are arranged in a staggered and tilted manner in front and back, so as to form a plurality of hanging structures 223 in the metal wire braided chain. Each V-shaped structural unit 222 in the second layer of the metal wire braided chain and each U-shaped structural unit 221 in the first layer of the metal wire braided chain are hung on the U-shaped structural unit 221 of the first layer through the hanging structure 223, and the multi-layer metal wire braided chain is hung to form a plurality of U-shaped structural units 221 and V-shaped structural units 222 in the second layer of the metal wire braided chain. Figure 9 or Figure 10 The wire mesh is formed by curling the wire mesh in the direction of the multiple wire braiding chains as the curling axis. Figure 3 The multi-layer tubular demisting structure 22 with ventilation gaps is shown. The design of the V-shaped structural unit 222 is convenient, and the liquid impurities can condense and gather on the inclined metal wires on both sides of the V-shaped structural unit 222 to form larger droplets, and then gather at the bottom tip of the V-shaped structural unit 222 to drip from there, thereby realizing automatic flushing and cleaning of the V-shaped structural unit 222; the U-shaped structural unit 221 can be as shown. Figure 9 or Figure 10 The size of the closed end is preferably designed to be slightly larger than the open end, so that the V-shaped structural unit 222 can be easily attached, and the connection with the V-shaped structural unit 222 can facilitate the condensation and convergence of the droplets formed on the metal wires on both sides of the U-shaped structural unit 221. When the droplets flow to the bottom of the U-shaped structural unit 221, they can further flow to the metal wires on both sides of the V-shaped structural unit 222, and finally converge to the bottom tip of the V-shaped structural unit 222 and drip, and as shown in FIG. Figure 10As shown, the size of the V-shaped structure unit 222 in the up and down directions can be set to more than twice the size of the U-shaped structure unit 221 in the up and down directions (for example, it can be preferably set to 3 times), so that the bottom tip of the V-shaped structure unit 222 in the upper layer of the metal wire braided chain can overlap with the bottom of the U-shaped structure unit 221 in the lower layer of the metal wire braided chain, so that the liquid-phase impurities condensed and gathered on the U-shaped structure unit 221 can be drained to the metal wires on both sides of the V-shaped structure unit 222, so as to facilitate the liquid-phase impurities at the bottom of the U-shaped structure unit 221 to flow downward. Therefore, the design of the above-mentioned metal wire braided structure can facilitate the downward flow of liquid-phase impurities, so that the liquid-phase impurities can realize automatic cleaning of the metal wire braided structure during the downward flow, so that it is not easy for liquid-phase impurities with a large viscosity coefficient to form sedimentation in the metal wire braided structure, and when the metal wire braided structure is manually flushed, it only needs to be flushed in one direction, which is more convenient and has a good flushing effect.

[0048] Furthermore, in an embodiment of the sample separation device provided by the present invention, the demisting structure 22 in the demisting device 2 is set to multiple (multi-stage), and in the multi-stage demisting structure 22, the closer to the outlet end of the demisting pipe 21, the smaller the size of the U-shaped structure unit 221 and the V-shaped structure unit 222 in the demisting structure 22, so that the ventilation gap of the demisting structure 22 closer to the outlet end of the demisting pipe 21 can be smaller, thereby achieving multi-level demisting, and liquid phase impurities with a larger viscosity coefficient will usually be separated first. Therefore, setting the demisting structure 22 with a larger ventilation gap at the inlet end of the demisting device 2 can make the demisting structure 22 at the inlet end less likely to be blocked, thereby extending the effective time of a single use of the demisting structure 22 (that is, the interval time between two flushings), and also making it convenient to flush the demisting structure 22 at the inlet end.

[0049] The above describes in detail the optional implementation methods of the embodiments of the present invention in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation methods. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the scope of protection of the embodiments of the present invention.

[0050] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0051] In addition, various implementations of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A sample separation device, characterized in that: The invention comprises a separation tank (1) and a demisting device (2) provided on the upper part of the separation tank (1); the separation tank (1) comprises a separation tank shell (11) formed with a separation chamber, a feeding device (12) provided on the separation tank side wall of the separation tank shell (11), and a discharge port (13) provided at the bottom of the separation tank shell (11); the separation tank side wall is a curved structure, and the discharge direction of the feeding device (12) is tangent to the separation tank side wall; the upper part of the separation tank shell (11) is connected to the demisting device (2); the demisting device (2) comprises a demisting pipe (21) and a demisting structure (22) provided in the demisting pipe (21); a ventilation gap is formed in the demisting structure, and the ventilation gap gradually decreases from the air inlet end to the air outlet end of the demisting device (2); The demisting structure (22) is a metal demisting device; The metal demister is a metal wire braided structure, and the metal wire braided structure includes a U-shaped structure unit (221) and a V-shaped structure unit (222). The U-shaped structure unit (221) is connected to the V-shaped structure unit (222) by connecting any U-shaped structure unit connection end (2211) on the upper part of the U-shaped structure unit (221) with any V-shaped structure unit connection end (2221) on the upper part of the V-shaped structure unit (222). A plurality of the U-shaped structure units (221) and the V-shaped structure units (222) are arranged to be alternately connected to form a metal wire braided chain, and a plurality of the U-shaped structure units (221) and the V-shaped structure units (222) are connected to each other. The V-shaped structural units (222) are arranged in a staggered and tilted arrangement in a front-to-back manner so as to form a plurality of hanging structures (223) in the metal wire braided chain; each of the V-shaped structural units (222) in the metal wire braided chain of the second layer and each of the U-shaped structural units (221) in the metal wire braided chain of the first layer are hung on the U-shaped structural units (221) of the first layer through the hanging structures (223), and the multiple layers of the metal wire braided chains are hung to form a metal wire braided mesh; the metal wire braided mesh is curled with the hanging direction of the multiple metal wire braided chains as a curling axis to form a multi-layer tubular demisting structure (22) having the ventilation gap; The size of the V-shaped structural unit (222) in the vertical direction is twice the size of the U-shaped structural unit (221) in the vertical direction, so that the bottom tip of the V-shaped structural unit (222) of the upper layer can overlap with the bottom of the U-shaped structural unit (221) of the lower layer.

2. The sample separation device according to claim 1, characterized in that The separation tank shell (11) is configured as a cylindrical structure or a conical structure that is wide at the top and narrow at the bottom; or the upper portion of the separation tank shell (11) is configured as a cylindrical structure, and the lower portion is configured as a conical structure that is wide at the top and narrow at the bottom.

3. The sample separation device according to claim 2, characterized in that A spiral downward separation chamber flow guide structure (111) is provided on the inner side of the separation tank shell (11), and the separation chamber flow guide structure (111) is a flow guide plate, one side of the flow guide plate is connected to the separation tank shell (11), and the other side is inclined upward to form a separation chamber flow guide groove (112) with the separation tank shell (11).

4. The sample separation device according to claim 3, characterized in that The cross section of the feeding device (12) is configured such that the area becomes smaller the closer to the discharge end of the feeding device (12), and the cross section of the feeding device (12) at the discharge end is configured such that the dimension in the vertical direction is larger than the dimension in the horizontal direction.

5. The sample separation device according to claim 4, characterized in that The upper end of the guide plate is connected to the upper part of the discharge end, the spacing of the spiral arrangement of the guide plates is consistent with the vertical dimension of the discharge end of the pipe, and the horizontal distance between the side of the guide plate away from the side wall of the separation chamber and the side wall of the chamber is greater than or equal to the horizontal dimension of the discharge end of the pipe.

6. The sample separation device according to any one of claims 1 to 5, characterized in that The separation tank shell (11) further comprises a separation chamber top plate (113) connected to the side wall of the separation tank, and a demister connection port is provided in the middle of the separation chamber top plate (113) for connection to the demister (2) via the demister connection port.

7. The sample separation device according to claim 6, characterized in that The inner surface of the connection between the demisting device connection port and the demisting device (2) is formed into a conical surface structure that is narrow at the top and wide at the bottom.

8. The sample separation device according to claim 1, wherein: The demisting structure (22) in the demisting device (2) is provided in a plurality, and the sizes of the U-shaped structural unit (221) and the V-shaped structural unit (222) in the demisting structure (22) are smaller as they are closer to the outlet end of the demisting pipe (21), so that the ventilation gap of the demisting structure (22) closer to the outlet end of the demisting pipe (21) can be smaller.

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