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CN-117000159-B - Fluid mass transfer device and method for strengthening bubbles by utilizing multistage reverse single cyclone

CN117000159BCN 117000159 BCN117000159 BCN 117000159BCN-117000159-B

Abstract

The invention relates to a fluid mass transfer device and a method for strengthening bubbles by utilizing multistage reverse single cyclone, comprising at least two reverse cyclone units which are connected in series, wherein each reverse cyclone unit comprises a reverse cyclone and a cyclone liquid storage cavity, each reverse cyclone comprises a cylindrical cavity part and a cyclone cavity part, a liquid inlet and a reverse cyclone gas channel are arranged on the cylindrical cavity part, a gas outlet, a liquid tangential outlet and a gas axial inlet are arranged on the cyclone cavity part, liquid to be transferred enters from the liquid inlet of the uppermost cyclone unit, and gas is discharged from the gas outlet after mass transfer. Compared with the prior art, the invention has the advantages of prolonging the gas-liquid contact time by connecting the reverse cyclone units in series, improving the mass transfer efficiency, sucking the gas by adopting the negative pressure effect of the fluid, reversely contacting and mixing the gas, crushing the gas to a smaller scale, improving the mass transfer area and the mass transfer coefficient, along with low energy consumption, high gas-liquid mass transfer efficiency, small occupied area of the whole device and the like.

Inventors

  • XU XIAO
  • LI SIYI
  • YANG QIANG
  • ZHANG YINGCHUN
  • Gong Chunkai
  • WANG SHUO

Assignees

  • 华东理工大学

Dates

Publication Date
20260512
Application Date
20230914

Claims (8)

  1. 1. The fluid mass transfer device for strengthening bubbles by utilizing multistage reverse single cyclone is characterized by comprising at least two reverse cyclone units which are mutually connected in series in the vertical direction to form a multistage structure, wherein each reverse cyclone unit comprises a reverse cyclone (10) and a cyclone liquid storage cavity (20), each reverse cyclone (10) comprises a cylindrical cavity part (100) and a cyclone cavity part (101), each cylindrical cavity part (100) is provided with a liquid inlet (1000) and a reverse cyclone gas channel (1001), each cyclone cavity part (101) is provided with a gas outlet (1010), a liquid tangential outlet (1015) and a gas axial inlet (1016), and in the reverse cyclone units which are mutually connected in series, the reverse cyclone (10) of the lower-stage reverse cyclone unit is positioned in the cyclone liquid storage cavity (20) of the upper-stage reverse cyclone unit, liquid to be transferred enters from the liquid inlet (1000) of the uppermost cyclone unit, and gas after mass transfer is discharged from the gas outlet (1010); in the reverse cyclone unit, the reverse cyclone (10) is connected with a cyclone liquid storage cavity (20), the cylindrical cavity body (100) is positioned in the cavity of the cyclone cavity body (101), and one end provided with a liquid inlet (1000) penetrates out of the cyclone cavity body (101); the cyclone cavity (101) is integrally formed by stacking an upper cylinder and a lower cylinder, a cavity in the lower cylinder is a gas-liquid reverse cyclone cavity (1017), a gas outlet (1010) is formed in the side wall of the upper cylinder, a liquid tangential outlet (1015) is formed in the side wall of the lower cylinder, and a gas axial inlet (1016) is formed in the bottom surface of the lower cylinder.
  2. 2. A fluid mass transfer device utilizing multistage reverse single cyclone enriched gas bubbles according to claim 1, wherein the cyclone liquid storage chamber (20) comprises a side wall (200) and a bottom plate (201), the side wall (200) being connected to the reverse cyclone (10).
  3. 3. The fluid mass transfer device utilizing multi-stage reverse single cyclone enhanced gas bubbles of claim 1 wherein the cyclone characteristic parameter K of the fluid mass transfer device is set: , Setting K to be in a range of 25 to 150, wherein Is the diameter of a gas-liquid reverse cyclone cavity (1017); is the equivalent diameter of the gas axial inlet (1016); Is the equivalent diameter of the liquid inlet (1000); Is the velocity of the m-th stage liquid inlet (1000); A velocity of the gas axial inlet (1016) for the first stage reverse cyclone unit; the series of the reverse rotational flow units are connected in series.
  4. 4. A fluid mass transfer device utilizing multistage reverse single cyclone enhanced gas bubbles as defined in claim 3, wherein each stage of said reverse cyclone units connected in series each other has a gas circulation function, and structural characteristic parameters of the reverse cyclone units for characterizing mass transfer effect are set : , Setting up In the range of 5 to 15, In the range of 320 to 420mm, And (3) with The ratio ranges from 0.7 to 1.0, And (3) with The ratio is in the range of 0.01 to 0.1, And (3) with The ratio is in the range of 0.2 to 0.8, wherein, Is the pressure value of the liquid inlet (1000), Is the pressure value of the gas-liquid reverse cyclone cavity (1017).
  5. 5. The fluid mass transfer device utilizing multi-stage reverse single cyclone enriched gas bubbles according to claim 1, wherein the dissolved oxygen mass transfer coefficient of the device ranges from 0.01 to 0.05, and the ratio of the volume flow rates of liquid and gas in the cyclone chamber portion (101) ranges from 1 to 50.
  6. 6. A fluid mass transfer method employing the multi-stage reverse single cyclone enhanced bubble fluid mass transfer device of claim 1, comprising the steps of: step S1, liquid enters a reverse cyclone (10) through a liquid inlet (1000); S2, enabling gas to enter into mixed contact with liquid through a gas axial inlet (1016), and generating a cyclone field consisting of bubble groups at a gas-liquid reverse cyclone cavity (1017); S3, in the gas-liquid reverse cyclone cavity (1017), liquid makes cyclone flow from the center to the side wall (200), a centrifugal field is generated, bubbles move to the center under the action of the centrifugal field, and a state of gas-liquid reverse flow is formed in which the liquid cyclone flow to the side wall (200) and the bubbles cyclone flow to the center; Step S4, discharging the gas after swirling through a gas outlet (1010), and detecting the discharged gas by using equipment, wherein if the liquid after swirling reaches the reverse swirling unit of the last stage, the step S5 is executed, otherwise, the step S1 is returned; in step S5, the swirling liquid is discharged through the liquid outlet (2010) of the last stage reverse swirling unit, and the discharged liquid is detected using the apparatus.
  7. 7. The fluid mass transfer method according to claim 6, wherein the rotational acceleration of the liquid in the gas-liquid reverse cyclone chamber (1017) is 40 to 1000 times the gravitational acceleration, the pressure drop of the liquid is in the range of 0.01 to 0.25MPa, and the separation efficiency of the gas and the liquid is 70 to 95%.
  8. 8. The fluid mass transfer method of claim 6, wherein in each stage of reverse cyclone units, the average velocity of the liquid injection liquid inlet (1000) is 4 to 20m/s, the velocity of the liquid discharge liquid outlet (2010) is 1 to 10m/s, the average velocity of the gas at the gas axial inlet (1016) is within 1 to 8m/s, and the average velocity of the gas at the gas outlet (1010) is within 1 to 5 m/s.

Description

Fluid mass transfer device and method for strengthening bubbles by utilizing multistage reverse single cyclone Technical Field The invention relates to the technical field of chemical reaction and gas-liquid mass transfer, in particular to a fluid mass transfer device and method for strengthening bubbles by utilizing multistage reverse single cyclone. Background In many industrial processes, the phenomenon that liquid entrains tiny bubbles and dissolved gas exists, and the cyclone reinforced gas-liquid mass transfer method has the advantages of compactness, high efficiency and low operation and maintenance cost and is applied to various gas-liquid mass transfer processes. However, the current research depth for the cyclone reinforced gas-liquid mass transfer is insufficient, the migration and coalescence rules of bubbles in cyclone degassing are not emphasized, and the research on the influence of centrifugal action and a pressure gradient field on the mass transfer of dissolved gas is lacking. Only the mechanism of the swirl field for strengthening the gas-liquid mass transfer is deeply known, the size and the structure of the more reasonable and efficient swirl strengthening gas-liquid mass transfer device can be designed, and the development of the liquid economic and efficient mass transfer technology is promoted. The application publication number CN115845423A discloses a device and a method for strengthening gas-liquid mass transfer by utilizing local circulation and bubble cyclone, and specifically discloses a device and a method for strengthening gas-liquid mass transfer by utilizing local circulation and bubble cyclone, wherein each stage of mass transfer unit comprises a cyclone negative pressure cavity and a bubble cyclone cavity which are mutually connected and axially perpendicular, a liquid inlet is arranged in the cyclone negative pressure cavity in a tangential direction, a gas inlet is arranged at one axial end, and a jet orifice which is tangentially communicated with the bubble cyclone cavity is arranged at the other axial end; the tangential direction of bubble whirl chamber sets up the liquid export, and the axial sets up the gas outlet, just the gas outlet with the gas inlet passes through circulation pipeline and links to each other. But the device occupies a larger area and has high energy consumption. The authorized bulletin number CN201342249Y discloses a disk type gas-liquid mass transfer device, and in particular discloses a disk type gas-liquid mass transfer device which comprises a gas-liquid distribution disk, a liquid sealing disk, a cylinder body, an upper sealing head, a lower sealing head, a gas phase inlet and outlet, a liquid phase inlet and outlet and the like. The gas-liquid distribution plate consists of an annular gas distribution box and a plurality of gas inlet pipes, the annular gas distribution box consists of a cylinder body, a conical guide plate and an annular bottom plate, a plurality of zigzag tooth grooves are formed in the upper edge of the cylinder body of the annular gas distribution box, an annular gap is formed between the conical guide plate of the annular gas distribution box and the annular bottom plate, and the gas-liquid distribution plate can be manufactured into a vertical multistage serial structure. But the equipment has the advantages of higher gas coalescence degree, uneven dispersion, smaller gas-liquid contact time, larger resistance and small mass transfer area. The authorization bulletin number CN102350294B discloses a countercurrent mass transfer, heat transfer and reaction device based on an ejector, and particularly discloses an upper separator, a unit device and a power flow inlet, wherein the upper separator is connected in a sealing way from top to bottom, the mass transfer, heat transfer or reaction device passes through the unit device, the top of the upper separator is provided with a light medium outlet, the bottom end of the lower separator is provided with a heavy medium outlet, the unit device is divided into a plurality of sections connected in series, the connection part of every two adjacent sections is provided with an ejector on a partition plate for separating fluid, a suction chamber of the ejector is connected with an ejector suction pipe, the other end of the ejector suction pipe passes through the partition plate and is connected with a front-stage unit device, and the power flow inlet is positioned at the top or the bottom of the unit device and is connected with a nozzle of the ejector through a pipeline. However, most of the mass transfer area of the device only occurs in the mixed central area, the gravity sedimentation principle is still adopted in the gas-liquid separation area, the heavy medium and the light medium are separated in a layered manner, the space of the required separation area is overlarge, and the separation area still has the action of a gravity field and does not have the action of intense c