Efficient cyclone separator for gas-liquid separation

Abstract

When the efficient cyclone separator for gas-liquid separation is used, liquid-containing gas enters the cyclone separator from the gas inlet pipe, airflow is changed into a rotating state from a direct-current state, and under the action of centrifugal force, large liquid drops in the gas are thrown to the inner side wall of the cylinder body and flow downwards, so that the liquid drops in the cylinder body flow downwards. The entrainment flows to a drain outlet to be discharged through gaps between the inner side wall of the lower cone and the lower end of the anti-backmixing cone and between the connecting pieces, the entrainment penetrates through the annular liquid containing disc from the lower end of the center pipe along with center airflow to enter the center pipe, is secondarily separated in the center pipe, is thrown to the surface of the fiber filter material barrel and is adsorbed and coalesced through the fiber filter material barrel, and the entrainment is discharged. The formed liquid drops are discharged downwards, are discharged into the liquid falling main pipe through the liquid discharging holes in the annular liquid containing disc and the liquid falling branch pipes and then flow to the sewage draining outlet from the lower end of the liquid falling main pipe to be discharged, and separated gas is discharged upwards from the gas outlet. According to the utility model, the entrainment trapping efficiency can be improved, and the gas-liquid separation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas-liquid separation, in particular to the technical field of cyclone separators, and specifically refers to an efficient cyclone separator for gas-liquid separation. Background Art

[0002] Cyclone separators can not only be used for gas-solid separation, but are also effective for gas-liquid separation. Moreover, when used for gas-liquid separation, there is no risk of blockage. It is an important gas-liquid separation device, which has the advantages of simple structure, high cost performance, simple operation, convenient maintenance, and can work under high temperature and high pressure. It is widely used in industrial fields such as chemical industry, petroleum, environmental protection, and food.

[0003] At present, for liquid droplets larger than 5μm, the cyclone separator can separate them well, but the separation efficiency for mist (defined as ultrafine liquid droplets with a size of 0.1μm - 5μm) needs to be improved. The main reasons are as follows:

[0004] (1) Compared with large liquid droplets, the mass of mist is much smaller, so the centrifugal force it receives at the same rotational air flow velocity is much smaller. At the normal cyclone inlet velocity (generally 15m / s - 20m / s), the centrifugal field force generated by the air flow is weak and not sufficient to separate the mist from the air flow.

[0005] (2) In addition to the main swirl flow inside the cyclone separator, there are also local secondary eddy currents, including: ① A local eddy current (top ash ring) is formed between the top cover of the cyclone separator, outside the central pipe and the inner wall of the cylinder due to the existence of radial velocity and axial velocity, which carries a considerable amount of particles flowing towards the center and descends along the outer surface of the middle air pipe, and finally escapes from the central pipe along with the central upward air flow, affecting the separation efficiency; ② Since the effective flow cross-section inside the central pipe is smaller than the effective flow cross-section of the inner swirl flow below the lower end of the central pipe, a throttling effect will occur at the lower end of the central pipe, forming a short-circuit flow, which will carry a large number of particles into the central pipe through a short circuit, which is very unfavorable for separation; ③ The center of the air flow rotation deviates from the geometric center of the equipment, resulting in a deviation flow, which throws the particles separated to the wall surface back into the inner swirl flow; ④ When the outer swirl flow turns upward at the bottom of the cone, bottom entrainment occurs due to "tail wagging", rolling up the particles that have settled to the bottom of the cone again. The existence of these secondary eddy currents will all reduce the droplet capture efficiency of the cyclone separator.

[0006] To improve the efficiency of cyclone separators in collecting droplets, a common industrial practice is to increase the centrifugal force on the droplets by increasing the cyclone's inlet velocity. This increases the probability of droplet collision and coalescence, thereby improving the collection efficiency of the droplets. However, increasing the flow rate brings new problems: ① As the airflow velocity increases, although the centrifugal force field increases accordingly, the turbulence intensity within the cyclone also increases significantly. Under the strong shear force of the rotating airflow, the droplets may be broken into smaller droplets, making separation more difficult. ② When the inlet velocity is too high, the large droplets formed by collision and coalescence collide with the cylinder wall and produce a rebound effect, which may cause the separated droplets to re-mix with the airflow, which also reduces the separation efficiency.

[0007] Therefore, if you want to improve the cyclone separator's collection efficiency of mist and droplets, it is not enough to just increase the cyclone separator's inlet velocity. You must also try to eliminate or suppress these local secondary vortices in the cyclone separator that are unfavorable to separation through structural optimization, and give full play to the favorable rotational flow.

[0008] Therefore, it is hoped to provide a high-efficiency cyclone separator for gas-liquid separation, which can improve the capture efficiency of mist and improve the gas-liquid separation efficiency. Utility Model Content

[0009] In order to overcome the shortcomings of the above-mentioned prior art, one purpose of the present invention is to provide a high-efficiency cyclone separator for gas-liquid separation, which can improve the capture efficiency of mist and improve the gas-liquid separation efficiency, and is suitable for large-scale promotion and application.

[0010] Another object of the present invention is to provide a high-efficiency cyclone separator for gas-liquid separation, which has an ingenious design, a simple structure, is easy to manufacture, has a low manufacturing cost, and is suitable for large-scale promotion and application.

[0011] The evaporation nozzle is fixed on the top of the air filter, and the evaporation nozzle is fixed on the top of the air filter, and the evaporation nozzle is installed on the bottom of the air filter.

[0012] The fiber filter cartridge is vertically arranged and located inside the central pipe and abuts against the inner side wall of the central pipe. The annular liquid storage tray is horizontally arranged and located inside the lower end of the central pipe and is connected to the lower end of the central pipe. The lower end of the fiber filter cartridge is arranged on the annular liquid storage tray. The annular liquid storage tray is vertically provided with liquid discharge holes, and the liquid discharge holes are located below the lower end of the fiber filter cartridge. The main liquid descending pipe is vertically arranged and coaxially arranged with the cylinder body. The upper end of the main liquid descending pipe is closed and located inside the cylinder body and lower than the liquid discharge holes. The liquid descending branch pipe is arranged obliquely relative to the vertical direction. The upper end of the liquid descending branch pipe is located below the liquid discharge holes and is connected to the liquid discharge holes. The lower end of the liquid descending branch pipe is connected to the upper end of the main liquid descending pipe. The lower end of the main liquid descending pipe is not closed and is located inside the lower part of the lower cone and above the sewage discharge port. The number of the liquid discharge holes is multiple, and the multiple liquid discharge holes are arranged at intervals along the circumferential direction of the annular liquid storage tray. The number of the liquid descending branch pipes is the same as the number of the liquid discharge holes, and the liquid descending branch pipes and the liquid discharge holes are arranged in one-to-one correspondence.

[0013] Preferably, the fiber filter cartridge is a glass fiber filter cartridge or a synthetic fiber filter cartridge.

[0014] Preferably, an annular groove is provided on the top surface of the annular liquid storage tray. The lower end of the fiber filter cartridge is vertically inserted into the annular groove and abuts against the bottom of the annular groove. The liquid discharge holes are vertically arranged in the bottom of the annular groove.

[0015] Preferably, the distance between two adjacent liquid discharge holes in the circumferential direction of the annular liquid storage tray in the circumferential direction of the annular liquid storage tray ≤ 400 mm.

[0016] Preferably, the diameter of the main liquid descending pipe is 0.2 times to 0.5 times the diameter of the cylinder body.

[0017] Preferably, the high-efficiency cyclone separator for gas-liquid separation further includes an anti-backmixing cone and a connecting member. The anti-backmixing cone is vertically arranged with a smaller upper part and a larger lower part. The anti-backmixing cone is located inside the lower cone and coaxially arranged with the lower cone. The upper end of the anti-backmixing cone is sleeved outside the lower end of the main liquid descending pipe. The upper end of the anti-backmixing cone is higher than the sewage discharge port and is arranged at intervals with the inner side wall of the lower cone. The connecting member is located between the lower end of the anti-backmixing cone and the inner side wall of the lower cone and is respectively connected to the lower end of the anti-backmixing cone and the inner side wall of the lower cone. The number of the connecting members is multiple, and the multiple connecting members are horizontally arranged at intervals around the lower end of the anti-backmixing cone.

[0018] More preferably, the cone angle θ of the anti-backmixing cone is 45° to 100°.

[0019] Preferably, the high-efficiency cyclone separator for gas-liquid separation further includes an outer sleeve pipe. The outer sleeve pipe is vertically arranged and sleeved outside the central pipe and coaxially arranged with the central pipe. The upper end of the outer sleeve pipe is located below the upper head and connected to the upper head. The lower end of the outer sleeve pipe is located inside the cylinder body and higher than the lower end of the central pipe. Exhaust holes are arranged along the radial direction of the side wall of the central pipe. The exhaust holes are located inside the outer sleeve pipe. The number of the exhaust holes is multiple. The multiple exhaust holes are arranged around the axis of the central pipe and are spaced from each other.

[0020] More preferably, the diameter of the outer sleeve pipe is 1.05 to 1.30 times the diameter of the central pipe.

[0021] More preferably, the diameter of the exhaust holes is 2 mm to 10 mm.

[0022] The beneficial effects of the present utility model mainly lie in:

[0023] 1. When the high-efficiency cyclone separator for gas-liquid separation of the present utility model is in use, the liquid-containing gas enters the cyclone separator from the inlet pipe. The air flow changes from a direct current state to a rotating state. Under the action of centrifugal force, the larger liquid droplets in the gas are thrown towards the inner side wall of the cylinder body and flow down along the inner side wall of the cylinder body. It flows through the gap between the inner side wall of the lower cone and the lower end of the anti-backmixing cone and between the connecting parts to the sewage outlet for discharge. The mist and foam enter the central pipe from the lower end of the central pipe through the annular liquid holding tray along with the central air flow. The mist and foam are secondarily separated in the central pipe and thrown towards the surface of the fiber filter cartridge. Through the adsorption and coalescence of the fiber filter cartridge, the formed liquid droplets are discharged downward. They are discharged through the liquid discharge holes in the annular liquid holding tray to the liquid downcomer branch pipe and then flow to the liquid downcomer main pipe 8, and then flow to the sewage outlet from the lower end of the liquid downcomer main pipe for discharge. The separated gas is discharged upward from the air outlet. Therefore, it can improve the trapping efficiency of the mist and foam, improve the gas-liquid separation efficiency, and is suitable for large-scale popularization and application.

[0024] 2. When the high-efficiency cyclone separator for gas-liquid separation of the present utility model is in use, the liquid-containing gas enters the cyclone separator from the inlet pipe. The air flow changes from a direct current state to a rotating state. Under the action of centrifugal force, the larger liquid droplets in the gas are thrown towards the inner side wall of the cylinder body and flow down along the inner side wall of the cylinder body. It flows through the gap between the inner side wall of the lower cone and the lower end of the anti-backmixing cone and between the connecting parts to the sewage outlet for discharge. The mist and foam enter the central pipe from the lower end of the central pipe through the annular liquid holding tray along with the central air flow. The mist and foam are secondarily separated in the central pipe and thrown towards the surface of the fiber filter cartridge. Through the adsorption and coalescence of the fiber filter cartridge, the formed liquid droplets are discharged downward. They are discharged through the liquid discharge holes in the annular liquid holding tray to the liquid downcomer branch pipe and then flow to the liquid downcomer main pipe 8, and then flow to the sewage outlet from the lower end of the liquid downcomer main pipe for discharge. The separated gas is discharged upward from the air outlet. Therefore, it is ingeniously designed, has a simple structure, is easy to manufacture, has a low manufacturing cost, and is suitable for large-scale popularization and application.

[0025] These and other objects, features, and advantages of the present utility model are fully embodied by the following detailed description and the accompanying drawings, and can be achieved by the means, devices, and their combinations specifically pointed out in the content of the utility model. Description of the Drawings

[0026] Figure 1 is a front sectional view schematic diagram of the first specific embodiment of the high-efficiency cyclone separator for gas-liquid separation of the present utility model.

[0027] Figure 2 is Figure 1 a sectional view schematic diagram at the A-A position in

[0028] Figure 3 is Figure 1 an enlarged schematic diagram of area F in

[0029] Figure 4 is Figure 1 a sectional view schematic diagram at the B-B position in

[0030] Figure 5 is Figure 1 a sectional view schematic diagram at the C-C position in

[0031] Figure 6 is a sectional view schematic diagram of the same position as the B-B position in the second specific embodiment of the high-efficiency cyclone separator for gas-liquid separation of the present utility model and Figure 1 in

[0032] (Symbol Explanation)

[0033] 1 Cylinder body; 2 Upper head; 3 Lower cone; 4 Inlet pipe; 5 Central pipe; 6 Fiber filter cartridge; 7 Annular liquid holding tray; 8 Main liquid discharge pipe; 9 Liquid discharge branch pipe; 10 Drain port; 11 Outlet; 12 Liquid discharge hole; 13 Annular groove; 14 Anti-backmixing cone; 15 Connector; 16 Outer sleeve; 17 Exhaust hole; 18 Mounting support. Detailed Embodiment

[0034] In order to be able to more clearly understand the technical content of the present utility model, the following embodiments are specifically given for detailed description.

[0035] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0036] Please refer to Figures 1 to 5 As shown, in the first specific embodiment of the present utility model, the high-efficiency cyclone separator for gas-liquid separation of the present utility model includes a cylinder body 1, an upper head 2, a lower cone 3, an air inlet pipe 4, a central pipe 5, a fiber filter cartridge 6, an annular liquid holding tray 7, a main liquid discharge pipe 8, and a liquid discharge branch pipe 9, where:

[0037] The cylinder body 1, the lower cone 3, and the central pipe 5 are all vertically arranged and coaxially arranged with each other. The upper head 2 is arranged at the upper end of the cylinder body 1. The lower cone 3 is thick at the top and thin at the bottom. The lower end of the cylinder body 1 is arranged at the upper end of the lower cone 3. A sewage discharge port 10 is arranged at the lower end of the lower cone 3. The central pipe 5 is vertically inserted into the upper head 2. The upper end of the central pipe 5 is exposed on the upper head 2 and an air outlet 11 is arranged thereon. The lower end of the central pipe 5 is located inside the cylinder body 1. The air inlet pipe 4 is arranged in the front-rear direction. The rear end of the air inlet pipe 4 is located on the side of the upper end of the cylinder body 1 and is tangentially connected to the upper end of the cylinder body 1 in a volute shape (i.e., a volute air inlet is formed, which can effectively improve the separation efficiency of the cyclone separator);

[0038] The fiber filter cartridge 6 is vertically arranged and located inside the central pipe 5 and abuts against the inner side wall of the central pipe 5. The annular liquid holding tray 7 is horizontally arranged and located inside the lower end of the central pipe 5 and is connected to the lower end of the central pipe 5. The lower end of the fiber filter cartridge 6 is arranged on the annular liquid holding tray 7. The annular liquid holding tray 7 is vertically provided with liquid discharge holes 12. The liquid discharge holes 12 are located below the lower end of the fiber filter cartridge 6. The main liquid discharge pipe 8 is vertically arranged and coaxially arranged with the cylinder body 1. The upper end of the main liquid discharge pipe 8 is closed and located inside the cylinder body 1 and is lower than the liquid discharge holes 12. The liquid discharge branch pipe 9 is arranged obliquely relative to the vertical direction. The upper end of the liquid discharge branch pipe 9 is located below the liquid discharge holes 12 and is connected to the liquid discharge holes 12. The lower end of the liquid discharge branch pipe 9 is connected to the upper end of the main liquid discharge pipe 8. The lower end of the main liquid discharge pipe 8 is not closed and is located inside the lower part of the lower cone 3 and above the sewage discharge port 10. The number of the liquid discharge holes 12 is multiple. The multiple liquid discharge holes 12 are arranged at intervals along the circumferential direction of the annular liquid holding tray 7. The number of the liquid discharge branch pipes 9 is the same as the number of the liquid discharge holes 12. The liquid discharge branch pipes 9 and the liquid discharge holes 12 are arranged in one-to-one correspondence.

[0039] The fiber filter cartridge 6 is made of a fiber filter material, which can be a fiber material such as glass fiber or synthetic fiber that has a filtering and coalescing effect on droplets. The fiber filter cartridge 6 is used to adsorb and coalesce the droplets separated by the central tube 5, solve the problem of "secondary entrainment" of droplets, and improve the separation efficiency of the cyclone separator. The fiber filter cartridge 6 can be a fiber filter cartridge made of any suitable material. Preferably, the fiber filter cartridge 6 is a glass fiber filter cartridge or a synthetic fiber filter cartridge. In the first specific embodiment of the present invention, the fiber filter cartridge 6 is a glass fiber filter cartridge.

[0040] The lower end of the fiber filter cartridge 6 is arranged on the annular liquid receiving tray 7, and any suitable structure can be adopted. Please refer to Figure 3 As shown, in the first specific embodiment of the present invention, an annular groove 13 is provided on the top surface of the annular liquid receiving tray 7. The lower end of the fiber filter cartridge 6 is vertically inserted into the annular groove 13 and abuts against the bottom of the annular groove 13. The drain hole 12 is vertically arranged at the bottom of the annular groove 13.

[0041] The distance between two adjacent drain holes 12 in the circumferential direction of the annular liquid receiving tray 7 can be determined as needed. Preferably, the distance between two adjacent drain holes 12 in the circumferential direction of the annular liquid receiving tray 7 ≤ 400 mm, that is, the circumferential arc length distance between any two adjacent drain holes 12 ≤ 400 mm. In the first specific embodiment of the present invention, the distance between two adjacent drain holes 12 in the circumferential direction of the annular liquid receiving tray 7 is 400 mm.

[0042] The number of the downcomer branch pipes 9 can be determined as needed. Please refer to Figure 4 As shown, in the first specific embodiment of the present invention, the number of the downcomer branch pipes 9 is 2.

[0043] The multiple relationship between the diameter of the downcomer main pipe 8 and the diameter of the cylinder body 1 can be determined as needed. Preferably, the diameter of the downcomer main pipe 8 is 0.2 to 0.5 times the diameter of the cylinder body 1. In the first specific embodiment of the present invention, the diameter of the downcomer main pipe 8 is 0.5 times the diameter of the cylinder body 1.

[0044] The high-efficiency cyclone separator for gas-liquid separation may further include any other suitable components. Please refer to Figure 5As shown, in the first specific embodiment of the present utility model, the high-efficiency cyclone separator for gas-liquid separation also includes an anti-backmixing cone 14 and a connecting piece 15, the anti-backmixing cone 14 is vertically arranged and thin at the top and thick at the bottom, the anti-backmixing cone 14 is located in the lower cone 3 and is coaxially arranged with the lower cone 3, the upper end of the anti-backmixing cone 14 is sleeved on the outside of the lower end of the downcomer main pipe 8, the lower end of the anti-backmixing cone 14 is higher than the sewage outlet 10 and is spaced apart from the inner side wall of the lower cone 3, the connecting piece 15 is located between the lower end of the anti-backmixing cone 14 and the inner side wall of the lower cone 3 and respectively connects the lower end of the anti-backmixing cone 14 and the inner side wall of the lower cone 3, the number of the connecting pieces 15 is multiple, and the multiple connecting pieces 15 are horizontally arranged around the lower end of the anti-backmixing cone 14 and spaced apart from each other. With the above arrangement, the anti-backmixing cone 14 can effectively prevent the liquid discharged from the downcomer main 8 from being drawn into the central airflow again, thus preventing the backmixing phenomenon from occurring, greatly reducing the tail pot swing, and improving the separation efficiency of the cyclone separator.

[0045] The number of the connecting members 15 can be determined as needed. The above "multiple" means more than 2. Figure 5 As shown, in the first specific embodiment of the present invention, the number of the connecting members 15 is 3.

[0046] The connecting member 15 may have any suitable shape. Figure 1 and Figure 5 As shown, in the first specific embodiment of the present utility model, the connecting member 15 is a connecting rod.

[0047] The cone angle θ of the anti-backmixing cone 14 can be determined as needed. More preferably, the cone angle θ of the anti-backmixing cone 14 is 45° to 100°. In the first embodiment of the present invention, the cone angle θ of the anti-backmixing cone 14 is 100°.

[0048] The high efficiency cyclone separator for gas-liquid separation may also include any other suitable components, see Figure 1 and Figure 3As shown, in the first specific embodiment of the present utility model, the high-efficiency cyclone separator for gas-liquid separation further includes an outer sleeve 16. The outer sleeve 16 is vertically arranged and sleeved outside the central tube 5 and is coaxially arranged with the central tube 5. The upper end of the outer sleeve 16 is located below the upper head 2 and is connected to the upper head 2. The lower end of the outer sleeve 16 is located inside the cylinder body 1 and is higher than the lower end of the central tube 5. An exhaust hole 17 is arranged on the side wall of the central tube 5 along the radial direction of the central tube 5. The exhaust hole 17 is located inside the outer sleeve 16. The number of the exhaust holes 17 is multiple, and the multiple exhaust holes 17 are arranged around the axis of the central tube 5 and are spaced apart from each other. With the above arrangement, the gas passes through the exhaust hole 17, which can increase the flow area of the central tube 5 and reduce the operating resistance of the cyclone separator.

[0049] The multiple relationship between the diameter of the outer sleeve 16 and the diameter of the central tube 5 can be determined as needed. More preferably, the diameter of the outer sleeve 16 is 1.05 times to 1.30 times the diameter of the central tube 5. In the first specific embodiment of the present utility model, the diameter of the outer sleeve 16 is 1.05 times the diameter of the central tube 5.

[0050] The diameter of the exhaust hole 17 can be determined as needed. More preferably, the diameter of the exhaust hole 17 is 2 mm to 10 mm. In the first specific embodiment of the present utility model, the diameter of the exhaust hole 17 is 10 mm.

[0051] The size of the opening area of the multiple exhaust holes 17 can be determined as needed. More preferably, the opening area of the multiple exhaust holes 17 is 10% to 50% of the cross-sectional area of the central tube 5. In the first specific embodiment of the present utility model, the opening area of the multiple exhaust holes 17 is 10% of the cross-sectional area of the central tube 5.

[0052] The high-efficiency cyclone separator for gas-liquid separation may further include any other suitable components. Please refer to Figure 1 As shown, in the first specific embodiment of the present utility model, the high-efficiency cyclone separator for gas-liquid separation further includes a mounting support 18. The mounting support 18 is located outside the side wall of the lower part of the cylinder body 1 and is connected to the side wall of the lower part of the cylinder body 1. The number of the mounting supports 18 is multiple, and the multiple mounting supports 18 are horizontally arranged around the lower part of the cylinder body 1 and are spaced apart from each other. With the above arrangement, through the mounting support 18, it is convenient to install the present utility model.

[0053] The number of the mounting supports 18 can be determined as needed. In the first specific embodiment of the present utility model, the number of the mounting supports 18 is 4, and the 4 mounting supports 18 are respectively located at the front, rear, left and right of the lower part of the cylinder body 1.

[0054] Please refer to Figure 6 As shown, in the second specific embodiment of the present invention, different from Figures 1 to 5 the first specific embodiment shown, the number of the downcomer branch pipes 9 is three. There are also the following differences: the fiber filter cartridge 6 is a synthetic fiber filter cartridge. The distance between two adjacent drain holes 12 in the circumferential direction of the annular liquid holding tray 7 in the circumferential direction of the annular liquid holding tray 7 is 200 mm. The diameter of the downcomer main pipe 8 is 0.2 times the diameter of the cylinder body 1. The number of the connecting members 15 is four. The cone angle θ of the anti-backmixing cone 14 is 45°. The diameter of the outer sleeve 16 is 1.30 times the diameter of the central pipe 5. The diameter of the exhaust hole 17 is 2 mm. The opening area of the plurality of exhaust holes 17 is 50% of the cross-sectional area of the central pipe 5.

[0055] The working principle of the present invention is as follows: The liquid-containing gas enters the cyclone separator from the inlet pipe 4, and the air flow changes from a direct current state to a rotating state. Under the action of centrifugal force, the larger liquid droplets in the gas are thrown towards the inner side wall of the cylinder body 1 and flow down along the inner side wall of the cylinder body 1, and flow out through the gap between the inner side wall of the lower cone 3 and the lower end of the anti-backmixing cone 14 and between the connecting members 15 to the sewage outlet 10; the mist and foam pass through the annular liquid holding tray 7 from the lower end of the central pipe 5 and enter the central pipe 5. The mist and foam are secondarily separated in the central pipe 5 and thrown towards the surface of the fiber filter cartridge 6. Through the adsorption and coalescence of the fiber filter cartridge 6, the formed liquid droplets are discharged downward, and are discharged to the downcomer main pipe 8 through the drain holes 12 in the annular liquid holding tray 7 via the downcomer branch pipes 9, and then flow from the lower end of the downcomer main pipe 8 to the sewage outlet 10 and discharged; the anti-backmixing cone 14 can prevent the liquid discharged from the lower end of the downcomer main pipe 8 from being involved in the central air flow again, and prevent the occurrence of backmixing; the separated gas is discharged upward from the air outlet 11; the short-circuit flow formed by the top ash ring carries a considerable amount of liquid droplets and flows towards the center, and descends along the outer surface of the outer sleeve 16, and then enters the annular space formed between the outer sleeve 16 and the central pipe 5, passes through the exhaust holes 17 and enters the central pipe 5 after being filtered by the fiber filter cartridge 6, and then is discharged from the air outlet 11 out of the cyclone separator. Almost all the liquid droplets entrained in the short-circuit flow are filtered by the fiber filter cartridge 6.

[0056] Compared with the prior art, the beneficial effects of the present invention mainly lie in:

[0057] (1) The entrained liquid droplets are secondarily separated in the central pipe of the cyclone separator and thrown towards the surface of the fiber filter cartridge arranged on the inner side wall of the central pipe. Due to the strong "adsorption" and "coalescence" functions of the fiber filter cartridge for the entrained liquid droplets, once the entrained liquid droplets fall on the surface of the fiber filter cartridge, they are adsorbed by the fiber filter and gradually coalesce into large liquid droplets, which are firmly adsorbed by the fiber filter. When the fiber filter is saturated with adsorption, a liquid drainage channel will be formed inside the fiber filter, and the enriched liquid will be drained by gravity settlement to the annular liquid holding tray under the fiber filter cartridge, and then discharged to the bottom of the cyclone separator through the drainage holes, the liquid drainage branch pipe and the liquid drainage main pipe. This structural design creatively solves the contradiction between the separation of entrained liquid droplets from the gas and their movement following the gas flow. As long as the entrained liquid droplets can be separated, they can be smoothly drained away, perfectly solving the problem of "secondary entrainment" and significantly improving the entrained liquid droplet capture efficiency of the cyclone separator.

[0058] (2) An outer sleeve pipe is arranged outside the central pipe of the cyclone separator. The short-circuit flow formed by the top ash ring carries a considerable amount of liquid droplets and flows towards the center, and then descends along the outer surface of the outer sleeve pipe. Since the lower end of the outer sleeve pipe is higher than the lower end of the central pipe, this short-circuit flow will enter the annular space formed between the outer sleeve pipe and the central pipe, and then enter the central pipe through the multiple exhaust holes opened on the central pipe after being filtered by the fiber filter cartridge, and then be discharged from the cyclone separator. At this time, almost all the liquid droplets entrained in the short-circuit flow are filtered out by the fiber filter cartridge. This structural design not only eliminates the influence of the short-circuit flow on the separation efficiency of the cyclone separator, but also increases the flow area of the central pipe, effectively reducing the operating resistance of the cyclone separator.

[0059] (3) Near the sewage discharge port of the cyclone separator, when the outer swirl flow reverses to the inner swirl flow, the turbulence is extremely strong, and the swirl tail vortex will exhibit a wagging phenomenon, which is extremely likely to entrain the separated liquid droplet particles at the wall surface into the inner swirl flow, resulting in the backmixing and entrainment of the liquid droplets and reducing the separation efficiency of the cyclone separator. The utility model adds an anti-backmixing cone above the sewage discharge port, which can well reduce the swing of the tail vortex and improve the separation efficiency of the cyclone separator. In addition, the upper end of the anti-backmixing cone is sleeved outside the lower end of the liquid drainage main pipe, and the anti-backmixing cone can effectively prevent the liquid discharged from the liquid drainage main pipe from being involved in the central air flow again, eliminating the occurrence of backmixing.

[0060] (4) The liquid drainage main pipe not only functions as liquid drainage, but also can be used as a flow stabilizing column. The flow stabilizing column can guide the flow of the fluid, making the flow pattern of the flow field more regular, enhancing the axisymmetry of the tangential and axial velocity components, weakening the mutual disturbance between the inner and outer swirl flows, reducing the turbulence intensity, enhancing the stability of the flow field, and being beneficial to improving the separation efficiency of fine particles.

[0061] In the prior art, the mist that is not captured by the main swirling flow finally escapes through the central pipe of the cyclone separator. Reducing the amount of mist escaping from the central pipe is the most effective measure to improve the mist capture efficiency of the cyclone separator. Since the airflow in the central pipe also makes a strong swirling motion, the central pipe can be used to perform secondary separation on the mist to achieve the purpose of improving the separation efficiency. The capture efficiency of the mist can be further improved by reducing the diameter of the central pipe. However, the main problem in the design is not whether the central pipe can separate the mist again, but how to reasonably discharge the liquid phase that is thrown to the side wall by the centrifugal force smoothly. The reason is that the followability of the mist is very strong. Under the action of the huge aerodynamic force and shear force of the swirling airflow in the central pipe, even if the mist is separated and adheres to the inner wall of the central pipe, it is easily carried away by the airflow again. Even if it is not carried away by the airflow, it coalesces into large droplets on the inner wall of the central pipe and drips to the lower end of the central pipe under the action of gravity. However, due to the existence of a short-circuit flow here, the droplets will be blown into the central airflow by the short-circuit flow and carried out of the central pipe again. Therefore, in view of the above problems, the present utility model achieves the structural optimization of the cyclone separator through a clever design of the central pipe, which can not only eliminate or suppress the local secondary eddies that are unfavorable to separation in the cyclone separator, greatly improve the mist capture efficiency, but also solve the problem of how to smoothly discharge the liquid separated by the central pipe.

[0062] Therefore, the present utility model improves its separation efficiency by optimizing the structure of the cyclone separator, especially improving the capture efficiency of the mist. The liquid removal efficiency is significantly improved compared with that of the cyclone separator with a common structure.

[0063] In summary, the high-efficiency cyclone separator for gas-liquid separation of the present utility model can improve the capture efficiency of the mist, improve the gas-liquid separation efficiency, has a clever design, a simple structure, is easy to manufacture, has a low manufacturing cost, and is suitable for large-scale popularization and application.

[0064] Thus, the object of the present utility model has been fully and effectively achieved. The function and structural principle of the present utility model have been demonstrated and explained in the embodiments. Without departing from the said principle, the embodiments can be modified arbitrarily. Therefore, the present utility model includes all modified embodiments based on the spirit and scope of the claims.

Claims

1. An efficient cyclone separator for gas-liquid separation, comprising a cylinder body, an upper head, a lower cone, an air inlet pipe and a central pipe. The cylinder body, the lower cone and the central pipe are all vertically arranged and coaxially arranged with each other. The upper head is arranged at the upper end of the cylinder body. The lower cone is thick at the top and thin at the bottom. The lower end of the cylinder body is arranged at the upper end of the lower cone. A sewage discharge port is arranged at the lower end of the lower cone. The central pipe is vertically inserted into the upper head. The upper end of the central pipe is exposed on the upper head and an air outlet is arranged thereon. The lower end of the central pipe is located inside the cylinder body. The air inlet pipe is arranged in the front-rear direction. The rear end of the air inlet pipe is located on the side of the upper end of the cylinder body and is tangentially connected to the upper end of the cylinder body through a volute. It is characterized in that, The high-efficiency cyclone separator for gas-liquid separation further includes a fiber filter cartridge, an annular liquid storage tray, a main liquid discharge pipe, and liquid discharge branch pipes, where: The fiber filter cartridge is vertically arranged and located inside the central pipe and abuts against the inner side wall of the central pipe. The annular liquid storage tray is horizontally arranged and located inside the lower end of the central pipe and is connected to the lower end of the central pipe. The lower end of the fiber filter cartridge is arranged on the annular liquid storage tray. The annular liquid storage tray is vertically provided with liquid discharge holes, and the liquid discharge holes are located below the lower end of the fiber filter cartridge. The main liquid discharge pipe is vertically arranged and coaxially arranged with the cylinder body. The upper end of the main liquid discharge pipe is closed and located inside the cylinder body and lower than the liquid discharge holes. The liquid discharge branch pipes are arranged obliquely relative to the vertical direction. The upper ends of the liquid discharge branch pipes are located below the liquid discharge holes and are connected to the liquid discharge holes. The lower ends of the liquid discharge branch pipes are connected to the upper end of the main liquid discharge pipe. The lower end of the main liquid discharge pipe is not closed and is located inside the lower part of the lower cone and above the sewage discharge port. The number of the liquid discharge holes is multiple, and the multiple liquid discharge holes are arranged at intervals along the circumferential direction of the annular liquid storage tray. The number of the liquid discharge branch pipes is the same as the number of the liquid discharge holes, and the liquid discharge branch pipes and the liquid discharge holes are arranged in one-to-one correspondence.

2. The high-efficiency cyclone separator for gas-liquid separation according to claim 1, wherein, The fiber filter cartridge is a glass fiber filter cartridge or a synthetic fiber filter cartridge.

3. The high-efficiency cyclone separator for gas-liquid separation according to claim 1, characterized in that, The top surface of the annular liquid storage tray is provided with an annular groove. The lower end of the fiber filter cartridge is vertically inserted into the annular groove and abuts against the bottom of the annular groove. The liquid discharge holes are vertically arranged in the bottom of the annular groove.

4. The high-efficiency cyclone separator for gas-liquid separation according to claim 1, characterized in that, The distance between two adjacent liquid discharge holes along the circumferential direction of the annular liquid storage tray in the circumferential direction of the annular liquid storage tray ≤ 400 mm.

5. The high-efficiency cyclone separator for gas-liquid separation according to claim 1, wherein The diameter of the main liquid discharge pipe is 0.2 times to 0.5 times the diameter of the cylinder body.

6. The high-efficiency cyclone separator for gas-liquid separation according to claim 1, wherein, The high-efficiency cyclone separator for gas-liquid separation further includes an anti-backmixing cone and a connecting piece. The anti-backmixing cone is vertically arranged with a smaller upper part and a larger lower part. The anti-backmixing cone is located inside the lower cone and is coaxially arranged with the lower cone. The upper end of the anti-backmixing cone is sleeved outside the lower end of the main liquid discharge pipe. The upper end of the anti-backmixing cone is higher than the sewage discharge port and is spaced from the inner side wall of the lower cone. The connecting piece is located between the lower end of the anti-backmixing cone and the inner side wall of the lower cone and is respectively connected to the lower end of the anti-backmixing cone and the inner side wall of the lower cone. The number of the connecting pieces is multiple, and the multiple connecting pieces are horizontally arranged at intervals around the lower end of the anti-backmixing cone.

7. The high-efficiency cyclone separator for gas-liquid separation according to claim 6, wherein, The cone angle θ of the anti-backmixing cone = 45° to 100°.

8. The high-efficiency cyclone separator for gas-liquid separation according to claim 1, wherein The efficient cyclone separator for gas-liquid separation further includes an outer sleeve pipe. The outer sleeve pipe is vertically arranged and sleeved outside the central pipe and coaxially arranged with the central pipe. The upper end of the outer sleeve pipe is located under the upper head and connected to the upper head. The lower end of the outer sleeve pipe is located inside the cylinder body and higher than the lower end of the central pipe. Exhaust holes are arranged on the side wall of the central pipe along the radial direction of the central pipe. The exhaust holes are located inside the outer sleeve pipe. The number of the exhaust holes is multiple, and the multiple exhaust holes are arranged around the axis of the central pipe and spaced from each other.

9. The high-efficiency cyclone separator for gas-liquid separation according to claim 8, characterized in that, The diameter of the outer sleeve pipe is 1.05 to 1.30 times the diameter of the central pipe.

10. The high-efficiency cyclone separator for gas-liquid separation according to claim 8, characterized in that, The diameter of the exhaust hole is 2 mm to 10 mm.

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