DK200970062A - Spray dryer absorption process for flue gas with entrained coarse particles - Google Patents
Spray dryer absorption process for flue gas with entrained coarse particles Download PDFInfo
- Publication number
- DK200970062A DK200970062A DK200970062A DKPA200970062A DK200970062A DK 200970062 A DK200970062 A DK 200970062A DK 200970062 A DK200970062 A DK 200970062A DK PA200970062 A DKPA200970062 A DK PA200970062A DK 200970062 A DK200970062 A DK 200970062A
- Authority
- DK
- Denmark
- Prior art keywords
- particles
- spray dryer
- absorption apparatus
- flue gas
- dryer absorption
- Prior art date
Links
Claims (32)
1. A method for reducing the amount of coarser particles from a stream of flue gas prior to treatment by a spray dryer absorption process, comprising the steps of: directing a stream of flue gas containing entrained particles of varying sizes through a curve, thereby subjecting the particles to a centrifugal effect, collecting the particles predominately of the coarser size at a particles collecting means provided in the outer circumference of the curve, dispersing the flue gas reduced in particles of coarse particle sizes into the chamber of a spray dryer absorption apparatus, wherein the particles content of the original flue gas stream is above 20 g/Nm3.
2. The method according to claim 1, wherein the flue gas stream is directed through a curve of at least 90 degrees.
3. The method according to claim 1 or 2, wherein particles are collected at two or more particles collecting means positioned along the curve.
4. The method according to any of the preceding claims wherein the particle sizes entering the curve is distributed such that 10 vol% of the particles are of a size above lOOpm.
5. The method according to any of the preceding claims, wherein the flue gas stream originates from a plant combusting fossil fuel.
6. The method according to any of the preceding claims, wherein 50 % or more of particles having a size of 150pm and above is collected.
7. A spray dryer absorption apparatus for treating a stream of flue gas containing entrained coarse particles, comprising a gas disperser for entering the flue gas into a spray dryer absorber chamber containing an atomizer for spraying an absorbent slurry, and an outlet for the treated flue gas, wherein the gas disperser comprises a curved conduit through which the stream of flue gas is guided, thereby affecting the entrained particles with a centrifugal effect, a particles collecting means positioned at the outer perimeter of the curved conduit for collecting the particles, and one or more particles positioning means for assisting in conveying the particles to the particles collecting means.
8. The spray dryer absorption apparatus according to claim 7, wherein the curved conduit is curved at least 90 degrees.
9. The spray dryer absorption apparatus according to claims 7 or 8, wherein the curved conduit is part of a scroll having a cross-sectional area diminishing along the path of the flue gas stream.
10. The spray dryer absorption apparatus according to any of the claims 7 to 9, wherein two or more particles collecting means are positioned along the perimeter of the curved conduit.
11. The spray dryer absorption apparatus according to any of the claims 7 to 10, wherein the particles collecting means comprises a slot in the outer perimeter and a duct for conveying the collected particles.
12. The spray dryer absorption apparatus according to any of the claims 7 to 11, wherein the particles collecting means comprises a deflector in the outer perimeter and a duct for conveying the collected particles.
13. The spray dryer absorption apparatus according to any of the claims 7 to 12, wherein the collected particles are conveyed to the top of the spray dryer absorber chamber,
14. The spray dryer absorption apparatus according to any of the claims 7 to 12, wherein the collected particles are conveyed to the bottom of the spray dryer absorption chamber.
15. The spray dryer absorption apparatus according to any of the claims 7 to 12, wherein the collected particles are conveyed out of the spray dryer absorption apparatus.
16. The spray dryer absorption apparatus according to any of the claims 7 to 15, wherein particles positioning means is provided in the gas disperser main inlet or upstream hereof.
17. The spray dryer absorption apparatus according to claim 16, wherein the particles positioning means is a diverter plate positioned at the gas disperser main inlet for directing the inlet flue gas in the direction of the outer perimeter.
18. The spray dryer absorption apparatus according to any of the claims 7 to 17, wherein the particles collecting means are accessible for service from the outside of the spray dryer absorption apparatus.
19. The spray dryer absorption apparatus according to any of the claims 7 to 18, wherein the particles positioning means is an additional curved conduit positioned immediately upstream on the inlet of the scroll.
20. The spray dryer absorption apparatus according to any of the claims 7 to 19, wherein the particles positioning means is a floor guide track, in which a rod is attached to the bottom of the curved conduit to assist the movement of the particles towards the outer perimeter of the curved conduit.
21. The spray dryer absorption apparatus according to claim 20, wherein the rod is convexly curved in the flow direction of the stream of flue gas.
22. The spray dryer absorption apparatus according to any of the claims 20 or 21, wherein the rod is at least partly hollow.
23. The spray dryer absorption apparatus according to claim 7, wherein the particles positioning means is of an annular shape surrounding the gas disperser.
24. The spray dryer absorption apparatus according to any of the claims 7 to 23, wherein the particles positioning means is a wall guide track in which a rod is attached to the outer perimeter of the curved conduit, said rod being essentially perpendicular to the stream of flue gas.
25. The spray dryer absorption apparatus according to any of the claims 7 to 24, wherein two or more particles positioning means are selected.
26. A gas disperser unit for reducing the amount of coarser particles from a stream of flue gas prior to treatment by a spray dryer absorption process, comprising a curved conduit through which the stream of flue gas is guided, thereby affecting the entrained particles with a centrifugal effect, a particles collecting means positioned at the outer perimeter of the curved conduit for collecting the particles, and particles positioning means for assisting in the conveying the particles to the particles collecting means.
27. The disperser according to claim 26, wherein the curved conduit is curved at least 90 degrees.
28. The gas disperser according to claims 26 or 27, wherein two or more particles collecting means are positioned along the perimeter of the curved conduit.
29. The gas disperser according to any of the claims 26 to 28, wherein the particles collecting means comprises a slot in the outer perimeter and a duct for conveying the collected particles.
30. The gas disperser according to any of the claims 26 to 29, wherein the particles collecting means comprises a deflector in the outer perimeter and a duct for conveying the collected particles.
31. The gas disperser according to any of the claims 26 to 30, wherein the particle positioning means is provided in the gas disperser main inlet or upstream hereof.
32. The gas disperser according to any of the claims 26 to 31, wherein the particles positioning means is selected among one or more of the group consisting of (a) a diverter plate positioned at the gas disperser main inlet, (b) an additional curved conduit positioned immediately upstream on the inlet, (c) one or more floor guide tracks, (d) an annular shaped rod surrounding the gas disperser, and (e) one or more wall guide tracks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK200970062A DK200970062A (en) | 2009-07-14 | 2009-07-14 | Spray dryer absorption process for flue gas with entrained coarse particles |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK200970062 | 2009-07-14 | ||
| DK200970062A DK200970062A (en) | 2009-07-14 | 2009-07-14 | Spray dryer absorption process for flue gas with entrained coarse particles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DK200970062A true DK200970062A (en) | 2009-07-14 |
Family
ID=41077841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK200970062A DK200970062A (en) | 2009-07-14 | 2009-07-14 | Spray dryer absorption process for flue gas with entrained coarse particles |
Country Status (1)
| Country | Link |
|---|---|
| DK (1) | DK200970062A (en) |
-
2009
- 2009-07-14 DK DK200970062A patent/DK200970062A/en not_active Application Discontinuation
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AHS | Application shelved for other reasons than non-payment |