Search

CN-224199310-U - Dynamic single-screw devolatilizer with forced flow distribution

CN224199310UCN 224199310 UCN224199310 UCN 224199310UCN-224199310-U

Abstract

The utility model discloses a dynamic single-screw devolatilizer with forced flow distribution, which is sequentially provided with a driving motor, a reduction gearbox, a rear exhaust section, a feeding section, a first-stage stripping, a first-stage devolatilization, a second-stage stripping, a second-stage devolatilization, a third-stage stripping, a third-stage devolatilization and a conveying/mixing section from the tail end to the head end. Wherein the rear exhaust section, the third-stage stripping and the third-stage devolatilization can be omitted according to the requirement. Due to the blocking effect of the reverse spiral structure or the damping ring arranged on the screw rod of the stripping section, the material flowing out of the stripping section enters a space formed by the flow dividing ring and the pressing block thereof in the forced flow dividing region of the shell of the devolatilization section, and then flows out into the spiral groove of the screw rod. The flow divider ring forcedly divides the melt to generate a large amount of melt surface area to provide a devolatilization gas-liquid phase interface, and the phase interface generated by the forceful flow division is constantly updated. Therefore, the devolatilizer can perform continuous dynamic and efficient devolatilization on the polymer/volatile system.

Inventors

  • CHEN ZHIQIANG
  • XIA TIAN
  • SONG JUNQUAN
  • CHANG JUNFENG
  • CHEN XUEJIE
  • CHEN YANFEI

Assignees

  • 江苏越升科技股份有限公司
  • 镇江越升智能装备制造有限公司

Dates

Publication Date
20260505
Application Date
20241223

Claims (18)

  1. 1. A dynamic single-screw devolatilizer with forced split flow can perform continuous dynamic and efficient devolatilization on a polymer/volatile component system, and is characterized by comprising the following components: The driving motor and the reduction gearbox (1) are arranged at the tail end of the dynamic single-screw devolatilizer; The rear exhaust section (2), the rear exhaust section (2) is fixedly connected with the driving motor and the reduction gearbox (1); The feeding section (3), the feeding section (3) is fixedly connected with the rear exhaust section (2); a first-stage stripping (4), the first-stage stripping (4) being connected to the feed section (3); a first stage devolatilization (5), the first stage devolatilization (5) being connected to the first stage stripping (4); a second-stage stripping (6), the second-stage stripping (6) being fixedly connected to the first-stage devolatilization (5); a second-stage devolatilization (7), the second-stage devolatilization (7) being fixedly connected to the second-stage stripping (6); A third stage stripping (8), said third stage stripping (8) being connected to the second stage devolatilization (7); A third-stage devolatilization (9), the third-stage devolatilization (9) being fixedly connected to the third-stage stripping (8); And the conveying/mixing section (10) is arranged at the tail end of the dynamic single-screw devolatilizer, and one end of the conveying/mixing section (10) is connected with the third-stage devolatilizer (9).
  2. 2. The dynamic single screw devolatilizer with forced split flow according to claim 1, characterized in that the length L2 of the rear exhaust section (2) is 3-15D, the lead of the screw thread is 0.5-4D, the depth of the screw groove is 0.05-0.4D, the depth of the screw groove is gradually reduced or kept unchanged from the feeding section to the side groove depth of the speed reducer.
  3. 3. The dynamic single screw devolatilizer with forced flow separation according to claim 1, wherein the length L2 of the rear exhaust section (2) is 4-6D, single or multi-start threads are adopted, the lead of the threads is 0.9-1.5D, and the depth of the screw grooves is 0.08-0.20D.
  4. 4. A dynamic single-screw devolatilizer with forced split flow can perform continuous dynamic and efficient devolatilization on a polymer/volatile component system, and is characterized by comprising the following components: The driving motor and the reduction gearbox (1) are arranged at the tail end of the dynamic single-screw devolatilizer; the feeding section (3), the feeding section (3) is fixedly connected with the driving motor and the reduction gearbox (1); a first-stage stripping (4), the first-stage stripping (4) being connected to the feed section (3); a first stage devolatilization (5), the first stage devolatilization (5) being connected to the first stage stripping (4); a second-stage stripping (6), the second-stage stripping (6) being fixedly connected to the first-stage devolatilization (5); a second-stage devolatilization (7), the second-stage devolatilization (7) being fixedly connected to the second-stage stripping (6); A third stage stripping (8), said third stage stripping (8) being connected to the second stage devolatilization (7); A third-stage devolatilization (9), the third-stage devolatilization (9) being fixedly connected to the third-stage stripping (8); And the conveying/mixing section (10) is arranged at the tail end of the dynamic single-screw devolatilizer, and one end of the conveying/mixing section (10) is connected with the third-stage devolatilizer (9).
  5. 5. The dynamic single screw devolatilizer with forced flow separation as claimed in claim 2, characterized in that the screw of the third stage stripping (8) is provided with mixing elements comprising pin blocks or slotted flights, the end of the stripping section is provided with a reverse helical structure or dampening ring having a diameter of 0.9-1.0D, the dampening ring has a width of 0.01-1D, and the length of the third stage stripping (8) is 1.5-5D.
  6. 6. The dynamic single screw devolatilizer with forced flow separation as claimed in claim 2, characterized in that the screw of the third stage stripping (8) is provided with mixing elements comprising pin blocks or slotted screw flights, the end of the stripping section is provided with a reverse helical structure or dampening ring having a diameter of 0.96-0.99D, the dampening ring has a width of 0.05-0.2D, and the length of the third stage stripping (8) is 2-3D.
  7. 7. The dynamic single screw devolatilizer with forced flow separation according to claim 2, characterized in that the forced flow separation zone in the shell of the third stage devolatilization (9) is composed of a space formed by a flow separation ring and a pressing block thereof, and the length of the forced flow separation zone is 0.1-5D; The split ring comprises, but is not limited to, slit type and porous type, wherein the slit width of the slit type split ring is 0.1-5mm, the slit length is 10-200mm, the slit distance is 1-10mm, the inlet of the slit is chamfered to avoid dead zone on the outer surface of the split ring, the slits are aligned or staggered in the axial direction, and the slits can be distributed along a straight line or spiral line in the axial direction; The pore diameter of the tail end of the porous flow dividing ring is 0.2-10mm, the pore spacing in the radial direction is 1-10mm, the pore spacing in the axial direction is 1-10mm, chamfering treatment is carried out at the inlet of the pore, and the porous flow dividing ring can be distributed along a straight line or a spiral line in the axial direction.
  8. 8. The dynamic single screw devolatilizer with forced flow separation according to claim 2, characterized in that the forced flow separation zone in the shell of the third stage devolatilization (9) is composed of a space formed by a flow separation ring and a pressing block thereof, and the length of the forced flow separation zone is 0.5-2D; The split ring comprises, but is not limited to, slit type and porous type, wherein the slit width of the slit type split ring is 0.5-2mm, the slit length is 20-80mm, the slit distance is 2-3mm, the inlet of the slit is chamfered to avoid dead zone on the outer surface of the split ring, the slits are aligned or staggered in the axial direction, and the slits can be distributed along a straight line or spiral line in the axial direction; The pore diameter of the tail end of the porous flow dividing ring is 0.5-3mm, the pore spacing in the radial direction is 2-5mm, the pore spacing in the axial direction is 2-5mm, chamfering treatment is carried out at the inlet of the pore, and the porous flow dividing ring can be distributed along a straight line or a spiral line in the axial direction.
  9. 9. The dynamic single screw devolatilizer with forced split flow as claimed in claim 2, characterized in that the screws at the forced split flow zone and the exhaust zone of the third stage devolatilization (9) are composed of multi-start screw threads with a length of 1-10D, a lead of 1-10D and a number of screw threads of 2-20.
  10. 10. The dynamic single screw devolatilizer with forced flow separation according to claim 2, characterized in that the screws at the forced flow separation zone and the exhaust zone of the third stage devolatilization (9) are composed of multi-start screw threads with a length of 5-8D, a lead of 2-6D and a number of screw threads of 4-12.
  11. 11. A dynamic single-screw devolatilizer with forced split flow can perform continuous dynamic and efficient devolatilization on a polymer/volatile component system, and is characterized by comprising the following components: The driving motor and the reduction gearbox (1) are arranged at the tail end of the dynamic single-screw devolatilizer; The rear exhaust section (2), the rear exhaust section (2) is fixedly connected with the driving motor and the reduction gearbox (1); The feeding section (3), the feeding section (3) is fixedly connected with the rear exhaust section (2); a first-stage stripping (4), the first-stage stripping (4) being connected to the feed section (3); a first stage devolatilization (5), the first stage devolatilization (5) being connected to the first stage stripping (4); a second-stage stripping (6), the second-stage stripping (6) being fixedly connected to the first-stage devolatilization (5); a second-stage devolatilization (7), the second-stage devolatilization (7) being fixedly connected to the second-stage stripping (6); And the conveying/mixing section (10) is arranged at the tail end of the dynamic single-screw devolatilizer, and one end of the conveying/mixing section (10) is connected with the second-stage devolatilizer (7).
  12. 12. The dynamic single-screw devolatilizer with forced split flow according to claim 11, wherein the length L3 of the feeding section (3) is 3-15D, the screw at the feeding port position is single-head or multi-head, deep groove threads, the lead is 0.5-4D, and the screw groove depth is 0.05-0.4D.
  13. 13. The dynamic single-screw devolatilizer with forced split flow according to claim 11, wherein the length L3 of the feeding section (3) is 6-8D, the screw at the feeding port position is single-head or multi-head, deep groove threads, the lead is 0.6-1.5D, and the screw groove depth is 0.1-0.2D.
  14. 14. The dynamic single screw devolatilizer with forced flow separation as claimed in claim 11, wherein the feed port position screw is single or multi-start, deep groove thread and the lead is 0.9-1.5D.
  15. 15. The dynamic single screw devolatilizer with forced flow separation according to claim 11, characterized in that the screw of the first stage stripping (4) is provided with mixing elements comprising pin blocks or slotted flights, the end of the stripping section is provided with a reverse helical structure or dampening ring with a diameter of 0.9-1.0D, the dampening ring has a width of 0.01-1D, the length of the first stage stripping (4) is 1.5-5D; the screw of the second-stage stripping (6) is provided with a mixing element comprising pin blocks or slotted screw edges, the tail end of the stripping section is provided with a reverse spiral structure or a damping ring, the diameter of the damping ring is 0.9-1.0D, the width of the damping ring is 0.01-1D, and the length of the second-stage stripping (6) is 1.5-5D.
  16. 16. The dynamic single screw devolatilizer with forced flow separation according to claim 11, characterized in that the screw of the first stage stripping (4) is provided with mixing elements comprising pin blocks or slotted screw flights, the end of the stripping section is provided with a reverse screw structure or a damping ring with a diameter of 0.96-0.99D, the width of the damping ring is 0.05-0.2D, the length of the first stage stripping (4) is 2-3D; The screw of the second-stage stripping (6) is provided with a mixing element comprising pin blocks or slotted screw flights, the tail end of the stripping section is provided with a reverse spiral structure or a damping ring, and the length of the second-stage stripping (6) is 2-3D.
  17. 17. The dynamic single screw devolatilizer with forced flow separation according to claim 11, characterized in that the forced flow separation zone in the shell of the first stage devolatilization (5) is composed of a space formed by a flow separation ring and its pressing block, the length of the forced flow separation zone is 0.1-5D; The split ring comprises, but is not limited to, slit type and porous type, wherein the slit width of the slit type split ring is 0.1-5mm, the slit length is 10-200mm, the slit distance is 1-10mm, the inlet of the slit is chamfered to avoid dead zone on the outer surface of the split ring, the slits are aligned or staggered in the axial direction, and the slits can be distributed along a straight line or spiral line in the axial direction; The pore diameter of the tail end of the porous flow dividing ring is 0.2-10mm, the pore spacing in the radial direction is 1-10mm, the pore spacing in the axial direction is 1-10mm, chamfering treatment is carried out at the inlet of the pore, and the porous flow dividing ring can be distributed along a straight line or in a spiral line in the axial direction; The forced flow distribution area in the shell of the second-stage devolatilization (7) is composed of a space formed by a flow distribution ring and a pressing block thereof, and the length of the forced flow distribution area is 0.1-5D; The split ring comprises, but is not limited to, slit type and porous type, wherein the slit width of the slit type split ring is 0.1-5mm, the slit length is 10-200mm, the slit distance is 1-10mm, the inlet of the slit is chamfered to avoid dead zone on the outer surface of the split ring, the slits are aligned or staggered in the axial direction, and the slits can be distributed along a straight line or spiral line in the axial direction; The pore diameter of the tail end of the porous flow dividing ring is 0.2-10mm, the pore spacing in the radial direction is 1-10mm, the pore spacing in the axial direction is 1-10mm, chamfering treatment is carried out at the inlet of the pore, and the porous flow dividing ring can be distributed along a straight line or in a spiral line in the axial direction; The screw rods at the positions of the forced diversion area and the exhaust area of the first-stage devolatilization (5) are composed of multi-head threads with the length of 1-10D, the lead of the threads of 1-10D and the number of heads of the threads of 2-20; the screw rods at the forced diversion area and the exhaust area of the second-stage devolatilization (7) are composed of multi-headed screw threads with the length of 1-10D, the lead of the screw threads of 1-10D and the number of the screw threads of 2-20.
  18. 18. The dynamic single screw devolatilizer with forced flow separation according to claim 11, characterized in that the forced flow separation zone in the shell of the first stage devolatilization (5) is composed of a space formed by a flow separation ring and its pressing block, the length of the forced flow separation zone is 0.5-2D; The split ring comprises, but is not limited to, slit type and porous type, wherein the slit width of the slit type split ring is 0.5-2mm, the slit length is 20-80mm, the slit distance is 2-3mm, the inlet of the slit is chamfered to avoid dead zone on the outer surface of the split ring, the slits are aligned or staggered in the axial direction, and the slits can be distributed along a straight line or spiral line in the axial direction; The aperture of the tail end of the porous flow dividing ring is 0.5-3mm, the radial upper hole spacing is 2-5mm, and the axial upper hole spacing is 2-5mm; The forced flow distribution area in the shell of the second-stage devolatilization (7) is composed of a space formed by a flow distribution ring and a pressing block thereof, and the length of the forced flow distribution area is 0.5-2D; The screw rods at the positions of the forced diversion area and the exhaust area of the first-stage devolatilization (5) are composed of multi-head threads with the length of 5-8D, the lead of the threads is 2-6D, and the number of heads of the threads is 4-12; The screws at the forced diversion area and the exhaust area of the second-stage devolatilization (7) are composed of multi-headed threads, and the length is 5-8D.

Description

Dynamic single-screw devolatilizer with forced flow distribution Technical Field The utility model relates to the technical field of polymer production and processing, in particular to a dynamic single-screw devolatilizer with forced split flow. Background During the synthesis of polymers, most of the polymer systems exiting the reactor contain components of low relative molecular mass, such as monomers, solvents, water and reaction by-products, collectively referred to as volatiles. These volatiles may be present in amounts up to tens of percents. The process of removing the above-mentioned volatiles from the bulk of the polymer is called devolatilization, which improves the degree of polymerization and the properties of the polymer, recovers the residual monomers and solvents, removes off-flavors, and meets health and environmental requirements. Depending on the field of application of the polymer product, the target volatile concentration in the devolatilization process may be several thousands to several tens ppm (parts per million), and the energy consumption in the devolatilization process may be as high as 60% or more in the whole polymer synthesis process. Therefore, efficient devolatilization is an important means for reducing the production cost of the polymer and improving the quality of the product. Patent CN11076524a invented a static devolatilizer comprising an upper phase separation chamber and a bottom distributor subunit, performing two-step devolatilization to increase the phase boundary area of the devolatilization, and to extend the residence time of the devolatilization process. However, the static devolatilizer cannot quickly update the surface, so that the polymer system with high viscosity and low volatile concentration cannot be treated. The residual volatile concentration of the polymer/volatile component system subjected to devolatilization treatment by the static devolatilizer of the invention is as high as thousands ppm, which is higher than the requirement of most application fields on the polymer residual volatile concentration. The devolatilizer of the twin-screw extruder disclosed in patent EP 2168743 and patent US 2020/0215738 is provided with a kneading section, and the kneading elements are used for exerting shearing action on the polymer melt to split the melt bundles in the screw grooves, so that the mass transfer interface area required by the devolatilization is generated, and the surface renewal is promoted. However, high shear stress can lead to degradation and color change of the polymer, affect the quality of the polymer product and limit the application field of the polymer product. In addition, compared with a single-screw extruder, the double-screw extruder has a complex structure and higher manufacturing and maintenance costs. Disclosure of Invention The present utility model aims to provide a dynamic single screw devolatilizer with forced split, solving one or more of the above-mentioned prior art problems. In a first aspect, the utility model provides a dynamic single screw devolatilizer with forced split flow, which can perform continuous dynamic and efficient devolatilization on a polymer/volatile system, comprising: The driving motor and the reduction gearbox are arranged at the tail end of the dynamic single-screw devolatilizer; the rear exhaust section is fixedly connected with the driving motor and the reduction gearbox; The feeding section is fixedly connected to the rear exhaust section; a first stage of stripping, the first stage of stripping being connected to the feed section; a first stage devolatilization connected to the first stage stripping; The second-stage stripping is fixedly connected with the first-stage devolatilization; A second stage devolatilization fixedly connected to the second stage stripping; a third stage stripping, said third stage stripping being coupled to the second stage devolatilization; The third-stage devolatilization is fixedly connected with the third-stage stripping; and the conveying/mixing section is arranged at the tail end of the dynamic single-screw devolatilizer, and one end of the conveying/mixing section is connected with the third-stage devolatilization. Wherein the dynamic single screw devolatilizer with forced split may also be referred to as Continuous Devolatilizer with Forced Distribution, CDFD. In a second aspect, the utility model provides a dynamic single screw devolatilizer with forced split flow, which can perform continuous dynamic and efficient devolatilization on a polymer/volatile system, comprising: The driving motor and the reduction gearbox (1) are arranged at the tail end of the dynamic single-screw devolatilizer; the feeding section (3), the feeding section (3) is fixedly connected with the driving motor and the reduction gearbox (1); a first-stage stripping (4), the first-stage stripping (4) being connected to the feed section (3); a first stage devolatilization (5), the first stage devol