DK201170105A - External mixing pressurized two-fluid nozzle and a spray drying method - Google Patents
External mixing pressurized two-fluid nozzle and a spray drying method Download PDFInfo
- Publication number
- DK201170105A DK201170105A DKPA201170105A DKPA201170105A DK201170105A DK 201170105 A DK201170105 A DK 201170105A DK PA201170105 A DKPA201170105 A DK PA201170105A DK PA201170105 A DKPA201170105 A DK PA201170105A DK 201170105 A DK201170105 A DK 201170105A
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- DK
- Denmark
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- gas
- pipe
- feed liquid
- processing method
- nozzle
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Glanulating (AREA)
- Freezing, Cooling And Drying Of Foods (AREA)
Abstract
Disclosed herein is an external mixing pressurized two-fluid nozzle for atomising a liquid by means of liquid pressure and gas, comprising an inner feed liquid pipe (1) extending axially between an upstream end and a downstream end, having a feed liquid conduit (2), a feed liquid inlet (3) positioned at the upstream end and a feed orifice (4) positioned at the downstream end, and a co-axial first gas pipe (5) extending radially outside the inner feed liquid pipe (1) and forming a first gas conduit (6) between the first gas pipe (5) and the inner feed liquid pipe (1), the first gas pipe (5) having a gas outlet slit (7) positioned at the downstream end. Said external mixing two-fluid nozzle provides a swirling motion of the gas, which combined with a pressurized feed Iiquid enables the production of spray dried powder at industrially applicable capacities with low energy consumption and a small particle size.
Claims (26)
1. An external mixing pressurized two-fluid nozzle for atomising a liquid by means of a liquid pressure and a gas, comprising an inner feed liquid pipe (1) extending axially between an upstream end and a downstream end, having a feed liquid conduit (2), a feed liquid inlet (3) positioned at the upstream end and a feed orifice (4) positioned at the downstream end, and a co-axial first gas pipe (5) extending radially outside the inner feed liquid pipe (1) and forming a first gas conduit (6) between the first gas pipe (5) and the inner feed liquid pipe (1), the first gas pipe (5) having a gas outlet slit (7) positioned at the downstream end characterized by a co-axial second gas pipe (8) extending radially outside the first gas pipe (5) and forming a second gas conduit (9) between the second gas pipe (8) and the first gas pipe (5), the first gas conduit (6) being closed at the upstream end and the second gas conduit (9) being closed at the downstream end, wherein the first gas conduit (6) and the second gas conduit (9) are connected by one or more slot(s) (10) being adapted for providing a swirling motion of a gas flow.
2. The nozzle according to claim 1, wherein the gas outlet slit (7) and the feed orifice (4) essentially are in the same horizontal position.
3. The nozzle according to claims 1 or 2, wherein the inner feed liquid pipe (1), the first gas pipe (5) and the second gas pipe (8) are concentric and tubular.
4. The nozzle according to claims 1 to 3, wherein the gas outlet slit (7) is annular.
5. The nozzle according to any of the preceding claims, wherein the one or more slot(s) (10) connecting the first gas conduit (6) and the second gas conduit (9) extend tangentially to the outer surface of the inner feed liquid pipe (1).
6. The nozzle according to any of the preceding claims, wherein the one or more slots are directed at an upwards or downwards angle relative to the horizontal plane.
7. The nozzle according to any of the preceding claims, wherein the inner feed liquid pipe (1) and the first gas pipe (5) converge radially towards the centre at the downstream end.
8. The nozzle according to any of the preceding claims, wherein the wear parts of the inner feed liquid pipe (1) are of a wear resistant ceramic material.
9. The nozzle according to any of the preceding claims, wherein the inner feed liquid pipe and/or the first gas pipe are exchangeable and/or adapted for receiving one or more inserts, and/or the second gas pipe outer wall is adapted for mounting in a lance.
10. A spray processing method for producing a spray dried powder comprising the steps of: a. providing a spray drying apparatus comprising an external mixing pressurized two-fluid nozzle having an inlet for feed liquid and atomization gas, a drying chamber having a drying gas inlet, and exits for spent drying gas/atomising gas and produced powder, b. spraying in the drying chamber the feed liquid through the external mixing two-fluid nozzle by means of liquid pressure and the atomisation gas into droplets, c. drying the droplets to powder d. discharging the powder trough the exit for produced powder and the spent gas through the exit for spent gas, wherein e. the feed liquid is supplied to the nozzle with a pressure at or above 8 bar(g), f. the atomisation gas is supplied to the nozzle with a pressure in the range of 0.2 to 10 bar(g), g. the entire amount of atomisation gas in the nozzle is provided with a swirling motion, and h. the weight ratio of atomisation gas flow to feed liquid flow is in the range of 0.1 to 10.
11. The spray processing method according to claim 10, wherein the swirling motion is provided by one or more slots, which connects a second gas conduit and a first gas conduit, said second conduit being connected to a gas supply and formed between a first gas pipe and a second gas pipe (8) extending radially outside the first gas pipe (5) and said first gas conduit being formed between an inner feed liquid pipe and the first gas pipe, said second gas conduit (9) being closed at the downstream end, said first gas conduit (6) being closed at the upstream end and connected to a gas outlet slit in the downstream end.
12. The spray processing method according to claims 10 or 11, wherein the one or more slot(s) (10) connecting the first gas conduit (6) and the second gas conduit (9) extend tangentially to the outer surface of the inner feed liquid pipe (1).
13. The spray processing method according to any of the claims 10 to 12, wherein the entire amount of gas for atomising the liquid flows through the one or more slots, which are adapted for providing a swirling motion of the gas flow.
14. The spray processing method according to any of the claims 10 to 13, wherein the liquid is supplied to the nozzle with a pressure of 10-150 bar(g).
15. The spray processing method according to any of the claims 10 to 14, wherein the gas is supplied with a pressure of 0.5-5 bar (g).
16. The spray processing method according to any of the claims 10 to 15, wherein the atomisation gas is ejected from the nozzle at a rotational speed of 50-400 m/s.
17. The spray processing method according to any of the claims 10 to 16, wherein the atomisation gas is ejected from the nozzle at a rotational speed of 100-200 m/s.
18. The spray processing method according to any of the claims 10 to 17, wherein the weight ratio of atomisation gas flow to feed liquid flow is from 0.5 to 5.
19. The spray processing method according to any of the claims 10 to 18, wherein the mean size of the droplets is less than 30pm.
20. The spray processing method according to any of the claims 10 to 19, wherein the mean size of the powder particles is less than 25pm.
21. The spray processing method according to any of the claims 10 to 20, wherein the mean size of the powder particles is less than 10pm.
22. The spray processing method according to any of the claims 10 to 19, wherein the liquid flow capacity of the external mixing two-fluid nozzle is 100 kg/h or above.
23. The spray processing method according to claim 10 to 20, wherein the external mixing two-fluid nozzle is according to any of the claims 1 to 9.
24. The spray processing method according to claim 10 to 21, wherein two or more external mixing two-fluid nozzles are provided in the spray drying apparatus.
25. The spray processing method according to any of the claims 10 to 22, wherein the spray dried powder is selected from the group consisting of powder for lithium ion batteries, powder for batteries, polymer powders, starch or gelatine powders, coffee powder, powders from abrasive feeds, inorganic powders, hard metal powders, pharmaceutical powders and congealed powders.
26. Use of an external mixing two-fluid nozzle according to any of the claims 1 to 9 for producing a spray dried powder selected from the group consisting of powder for lithium ion batteries, powder for batteries, polymer powders, starch or gelatine powders, coffee powder, powders from abrasive feeds, inorganic powders, hard metal powders, pharmaceutical powders and congealed powders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA201170105A DK201170105A (en) | 2011-02-28 | 2011-02-28 | External mixing pressurized two-fluid nozzle and a spray drying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA201170105A DK201170105A (en) | 2011-02-28 | 2011-02-28 | External mixing pressurized two-fluid nozzle and a spray drying method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DK201170105A true DK201170105A (en) | 2011-03-07 |
Family
ID=43754849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DKPA201170105A DK201170105A (en) | 2011-02-28 | 2011-02-28 | External mixing pressurized two-fluid nozzle and a spray drying method |
Country Status (1)
| Country | Link |
|---|---|
| DK (1) | DK201170105A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018154180A1 (en) * | 2017-02-21 | 2018-08-30 | Metabar Technology Oy | Nozzle, nozzle arrangement and liquid distribution system |
-
2011
- 2011-02-28 DK DKPA201170105A patent/DK201170105A/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018154180A1 (en) * | 2017-02-21 | 2018-08-30 | Metabar Technology Oy | Nozzle, nozzle arrangement and liquid distribution system |
| US11511296B2 (en) | 2017-02-21 | 2022-11-29 | Metabar Technology Oy | Nozzle, nozzle arrangement and liquid distribution system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AHS | Application shelved for other reasons than non-payment |