Drying device and drying method for hollow fiber membranes
View Patent ↗Disclosed is a drying device for a hollow fiber membrane, including: a tubular drying member that is formed with an opening portion through which a hollow fiber membrane is input and output at at least one end thereof in a length direction, the hollow fiber membrane passing inside the tubular drying member while forming a gap between the hollow fiber membrane and an inner circumferential surface of the tubular drying member; and a gas supply unit that is formed on a side surface of the tubular drying member and supplies a drying gas into the tubular drying member. Thus, it is possible to dry the hollow fiber membrane in a short time at a low cost without the necessity of large equipment.
1. A drying method comprising:
supplying a drying gas from a gas supply unit into a tubular drying member, wherein the gas supply unit is disposed on a side surface of the tubular drying member, and the tubular drying member comprises an opening portion through which a hollow fiber membrane is input and output at at least one end thereof in a length direction, the hollow fiber membrane passing inside the tubular drying member while forming a gap between the hollow fiber membrane and an inner circumferential surface of the tubular drying member;
injecting part of the drying gas into a hollow portion of the hollow fiber membrane from an outside of the hollow fiber membrane; and
discharging moisture present in the hollow fiber membrane from an outer surface of the hollow fiber membrane by a pressure difference, between the outside of the hollow fiber membrane and the hollow portion thereof, that occurs outside the tubular drying member.
2. The method of claim 1 ,
wherein a portion of the tubular drying member where the gas supply unit is disposed is a diameter expansion portion that is expanded in diameter with respect to a different portion thereof.
3. The method of claim 2 ,
wherein a gas dispersing element that disperses the drying gas from the gas supply unit is disposed in the diameter expansion portion.
4. The method of claim 1 ,
wherein the tubular drying member is capable of passing a plurality of hollow fiber membranes therethrough.
5. The method of claim 1 ,
wherein the tubular drying member is vertically disposed.
6. The method of claim 1 , wherein the drying gas is air.
7. The method of claim 1 , wherein the drying gas is an inert gas.
8. The method of claim 1 , wherein a temperature of the drying gas is 90 to 110° C.
9. The method of claim 1 , wherein a temperature of the drying gas is 95 to 105° C.
10. The method of claim 1 , wherein a gauge pressure of the drying gas is 0.1 to 0.3 MPa.
11. The method of claim 1 , wherein a gauge pressure of the drying gas is 0.1 to 0.2 MPa.
12. The method of claim 1 , wherein the gap is 0.4 to 1.6 mm.
13. The method of claim 1 , wherein the gap is 0.6 to 1.2 mm.
14. The method of claim 1 , wherein a ratio of a length of the tubular drying member and the gap is in a range of 2000:1 to 1000:1.
15. The method of claim 1 , wherein a ratio of a length of the tubular drying member and the gap is in a range of 1800:1 to 1200:1.
16. The method of claim 1 , wherein the drying gas has a residence time of 20 to 40 seconds.
17. A drying method comprising:
supplying a drying gas from a gas supply unit into a tubular drying member, wherein the gas supply unit is disposed on a side surface of the tubular drying member, and the tubular drying member comprises an opening portion through which a hollow fiber membrane is input and output at at least one end thereof in a length direction, the hollow fiber membrane passing inside the tubular drying member while forming a gap between the hollow fiber membrane and an inner circumferential surface of the tubular drying member;
injecting part of the drying gas into a hollow portion of the hollow fiber membrane from an outside of the hollow fiber membrane; and
discharging the drying gas injected in the hollow portion to the outside of the hollow fiber membrane from the hollow portion thereof by a pressure difference, between the outside of the hollow fiber membrane and the hollow portion thereof, that occurs outside the tubular drying member.
18. The method of claim 17 ,
wherein a portion of the tubular drying member where the gas supply unit is disposed is a diameter expansion portion that is expanded in diameter with respect to a different portion thereof.
19. The method of claim 18 ,
wherein a gas dispersing element that disperses the drying gas from the gas supply unit is disposed in the diameter expansion portion.
20. The method of claim 17 ,
wherein the tubular drying member is capable of passing a plurality of hollow fiber membranes therethrough.
21. The method of claim 17 ,
wherein the tubular drying member is vertically disposed.
22. The method of claim 17 , wherein the drying gas is air.
23. The method of claim 17 , wherein the drying gas is an inert gas.
24. The method of claim 17 , wherein a temperature of the drying gas is 90 to 110° C.
25. The method of claim 17 , wherein a temperature of the drying gas is 95 to 105° C.
26. The method of claim 17 , wherein a gauge pressure of the drying gas is 0.1 to 0.3 MPa.
27. The method of claim 17 , wherein a gauge pressure of the drying gas is 0.1 to 0.2 MPa.
28. The method of claim 17 , wherein the gap is 0.4 to 1.6 mm.
29. The method of claim 17 , wherein the gap is 0.6 to 1.2 mm.
30. The method of claim 17 , wherein a ratio of a length of the tubular drying member and the gap is in a range of 2000:1 to 1000:1.
31. The method of claim 17 , wherein a ratio of a length of the tubular drying member and the gap is in a range of 1800:1 to 1200:1.
32. The method of claim 17 , wherein the drying gas has a residence time of 20 to 40 seconds.