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CN-121988172-A - Rolling type membrane assembly, gas-liquid separation equipment and gas-liquid separation method

CN121988172ACN 121988172 ACN121988172 ACN 121988172ACN-121988172-A

Abstract

The application discloses a coiled membrane assembly, gas-liquid separation equipment and a gas-liquid separation method, wherein the coiled membrane assembly comprises a membrane unit and a central tube, one side of the membrane unit is connected with the central tube, the membrane unit sequentially comprises a first membrane, a first flow guide net, a second membrane and a second flow guide net from one surface, which is attached to the central tube, outwards, a gas flow channel is formed between the first membrane and the second flow guide net, a raw water flow channel is formed between the second membrane and the second flow guide net, a collecting hole is formed in the peripheral surface of the central tube, the collecting hole is communicated with the gas flow channel, and a spiral groove is formed in the inner peripheral wall of the central tube along the axial direction. The liquid to be treated flows through the raw water flow channel from the water inlet, the gas in the liquid to be treated enters the gas flow channel through the first membrane, the second membrane and the first flow guide net under the drive of the pressure difference at the gas phase side, and the gas enters the central tube through the collecting hole and is discharged. The coiled membrane component reduces the side flow resistance of permeation and improves the permeation flux and the separation efficiency.

Inventors

  • HUANG SIYUAN
  • YIN JING

Assignees

  • 上海电气集团股份有限公司

Dates

Publication Date
20260508
Application Date
20260313

Claims (10)

  1. 1. A rolled membrane assembly is characterized by comprising a membrane unit and a central tube, wherein one side of the membrane unit is connected with the central tube, the membrane unit sequentially comprises a first membrane, a first guide net, a second membrane and a second guide net from one surface attached to the central tube to the outside, and the other three sides of the membrane unit except one side connected with the central tube are in sealing joint, so that three sides of the first membrane, the first guide net, the second membrane and the second guide net are mutually connected into a whole; The collecting hole is formed in the outer peripheral surface of the central tube and is communicated with the gas flow channel, a spiral groove is formed in the inner peripheral wall of the central tube along the axis direction, the collecting hole is located on the spiral groove, the section of the spiral groove is rectangular or circular, the groove depth is 1/3-1/2 of the thickness of the wall of the ungrooved portion of the central tube, and the screw pitch is 1-2 times of the inner diameter of the central tube.
  2. 2. The rolled membrane module according to claim 1, wherein the first guide mesh is composed of a mesh and a guide cloth, the guide cloth being disposed on an outer periphery of the mesh and being in sealing engagement with edges of three sides of the mesh, one side not provided with the guide cloth being connected to the center tube.
  3. 3. The roll film assembly of claim 1, wherein the second flow-directing mesh is a mesh, the mesh is polypropylene, and the mesh has a mesh size of 80 mesh.
  4. 4. The roll film assembly of claim 2, wherein the material of the mesh and the cloth in the first guide mesh is polypropylene, the mesh number of the mesh in the first guide mesh is 10-40 mesh, the mesh number of the cloth is 100-200 mesh, and the gram weight of the cloth is 80g/m2.
  5. 5. The roll film assembly of claim 2, wherein the junction of the mesh and the cloth of the first guide web has a thickness equal to the thickness of the mesh in the first guide web.
  6. 6. The roll film assembly of claim 1, wherein the film unit has a film sheet length perpendicular to the center tube direction of no greater than 50cm.
  7. 7. The roll film assembly of claim 1, wherein the first film sheet and the second film sheet are polydimethylsiloxane composite films.
  8. 8. The roll-type membrane module according to claim 1, wherein the central tube is a stainless steel tube, the outer diameter of the central tube is 30-60 mm, the wall thickness of the central tube is 3-6 mm, and the aperture of the collecting hole is 4-8 mm.
  9. 9. A gas-liquid separation apparatus comprising a roll membrane module as claimed in any one of claims 1 to 8.
  10. 10. A gas-liquid separation method, characterized in that it is carried out using the gas-liquid separation apparatus according to claim 9, comprising the steps of: s1, flowing the liquid to be treated through the raw water flow channel from a water inlet port; S2, under the drive of a gas phase side pressure difference, gas in the liquid to be treated penetrates through the first membrane, the second membrane and the first flow guide net and enters the gas flow channel; s3, the gas enters the central tube through the collecting hole and is discharged.

Description

Rolling type membrane assembly, gas-liquid separation equipment and gas-liquid separation method Technical Field The invention relates to a coiled membrane assembly, gas-liquid separation equipment and a gas-liquid separation method. Background The liquid phase feeding gas phase separation is a typical separation form of a pervaporation membrane, is an efficient and energy-saving membrane separation process, and is particularly suitable for separating azeotropic and near-boiling mixtures. The separation is realized in a common flat membrane module form, and the coiled membrane module is a target form for realizing industrial application by pervaporation due to the advantages of high filling density, compact structure, relatively low manufacturing cost and the like. However, conventional pervaporation roll-to-roll membrane modules face several technical bottlenecks in long-term operation: The uneven distribution and pressure drop of the fluid are obvious, and when the raw material liquid flows in the flow channel of the membrane bag, the flow deflection, channeling or dead zone is easy to generate due to the unreasonable structure of the flow guide grid. This can result in higher local pressures at the membrane diffusion surface, creating severe pressure drops, significantly reducing the effective mass transfer driving force and separation efficiency of the module. The interface problem between the membrane and the diversion layer is that the traditional component generally adopts an adhesive to bond the membrane and the diversion net (diversion cloth). The adhesive may clog the membrane pores or the flow net, introducing additional mass transfer resistance. Meanwhile, under the conditions of swelling, temperature change and long-term operation involved in the pervaporation process, an adhesive interface is easy to age and crack, so that the sealing of a membrane bag is invalid or the performance of a component is attenuated. Center tube collection efficiency-permeate vapors need to be efficiently collected into and directed out of the center tube after they are generated in the membrane bag. When the traditional single-channel central tube collects the permeate produced in a large area, the back pressure is possibly increased due to long flow path and large resistance, and the effective maintenance of the vacuum degree of the permeate side is affected, so that the separation flux is reduced. Disclosure of Invention The invention aims to overcome the defects of large mass transfer resistance, low membrane flux and low gas-liquid separation efficiency of a coiled membrane assembly in the prior art, and provides the coiled membrane assembly, gas-liquid separation equipment and a gas-liquid separation method. The invention solves the technical problems by the following technical scheme: The invention provides a rolled membrane assembly, which comprises a membrane unit and a central tube, wherein one side of the membrane unit is connected with the central tube, the membrane unit sequentially comprises a first membrane, a first guide net, a second membrane and a second guide net from one surface attached to the central tube to the outside, and the other three sides of the membrane unit except the side connected with the central tube are in sealing joint, so that three sides of the first membrane, the first guide net, the second membrane and the second guide net are mutually connected into a whole; The collecting hole is formed in the outer peripheral surface of the central tube and is communicated with the gas flow channel, a spiral groove is formed in the inner peripheral wall of the central tube along the axis direction, the collecting hole is located on the spiral groove, the section of the spiral groove is rectangular or circular, the groove depth is 1/3-1/2 of the thickness of the wall of the ungrooved portion of the central tube, and the screw pitch is 1-2 times of the inner diameter of the central tube. In this scheme, through above-mentioned roll-type membrane module, effectively realized liquid phase feeding gas phase separation effect, wherein, in this scheme, with improving the center tube structure, set up the helicla flute in the center tube, make the center tube in integrate a water conservancy diversion rib that forms spiral channel with center tube wall internal surface. The guide rib extends spirally from the first collecting hole to the last collecting hole of the central tube to divide the inner cavity of the central tube into a continuous spiral flow passage. The separated permeate steam enters the central tube from the collecting hole and moves towards the outlet end along the spiral flow channel. The structure converts the traditional axial direct current into the spiral flow which advances in a rotating way, generates a slight centrifugal effect, is beneficial to the rapid collection of the permeation steam to the outlet end, avoids the disordered turbulence and the backflow of the steam in