SE463653B - Method for removing mercury from flue gases - Google Patents
Method for removing mercury from flue gasesInfo
- Publication number
- SE463653B SE463653B SE8802093A SE8802093A SE463653B SE 463653 B SE463653 B SE 463653B SE 8802093 A SE8802093 A SE 8802093A SE 8802093 A SE8802093 A SE 8802093A SE 463653 B SE463653 B SE 463653B
- Authority
- SE
- Sweden
- Prior art keywords
- flue gases
- sulfur
- line
- mercury
- selenium
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
2 463 653 Ett lämpligt sätt att tillföra svavlet resp selenet till bärgasen är att låta bärgasen i uppvärmt tillstånd passera genom en bädd av partiklar av svavel resp selen. Bärgasens temperatur skall för upptagning av ånga då ligga under smältpunkten för svavel resp selen. Lämplig temperatur vid upptagning av svavel resp selen är under men i närheten av smälttempera- turen. A suitable way of supplying the sulfur or selenium to the carrier gas is to allow the carrier gas in the heated state to pass through a bed of particles of sulfur or selenium. The temperature of the carrier gas must then be below the melting point for sulfur or selenium for the uptake of steam. Suitable temperature when absorbing sulfur or selenium is below but close to the melting temperature.
Pâ grund av att kvicksilverhalten i rökgaserna är mycket låg, av storleks- ordningen tusendels mg/Nm3 är den mängd svavel resp selen som behöver tillföras rökgaserna liten och synnerligen liten (av storleksordningen promille) jämfört med den mängd svavel i rökgaserna som härrör från bränslet. Även den bärgasmängd, som behöver tillföras är av samma skäl synnerligen liten i förhållande till rökgasmängden. Tillförd mängd svavel är företrädesvis så stor att molförhållandet S/Hg i den blandning som bringas att antaga den för reaktionen mellan kvicksilver och svavel erforderliga temperaturen uppgår till 10-1000. Motsvarande molförhâllande Se/Hg uppgår företrädesvis till 1-10. Det är en fördel att tillföra bärgasen med svavlet resp selenet till rökgaser med en lägre temperatur än den för reaktionen erforderliga för att sedan låta dessa rökgaser blandas med varmare rökgaser under åstadkommande av en blandning med den för reaktionen erforderliga temperaturen. Härigenom kan man åstadkomma en effektiv fördelning av svavlet resp selenet i rökgaserna innan de bringas till den för reaktionen erforderliga temperaturen.Due to the fact that the mercury content in the flue gases is very low, of the order of one thousand mg / Nm3, the amount of sulfur or selenium that needs to be added to the flue gases is small and extremely small (of the order of per mille) compared to the amount of sulfur in the flue gases derived from the fuel. The amount of carrier gas that needs to be supplied is also extremely small in relation to the amount of flue gas for the same reason. The amount of sulfur added is preferably so large that the molar ratio S / Hg in the mixture which is made to assume the temperature required for the reaction between mercury and sulfur amounts to 10-1000. The corresponding molar ratio Se / Hg is preferably 1-10. It is advantageous to supply the carrier gas with the sulfur or selenium to flue gases at a lower temperature than that required for the reaction and then to let these flue gases mix with hotter flue gases to provide a mixture with the temperature required for the reaction. In this way an efficient distribution of the sulfur or selenium in the flue gases can be achieved before they are brought to the temperature required for the reaction.
Uppfinningen skall förklaras närmare genom beskrivning av ett utförings- exempel under hänvisning till bifogade ritning som schematiskt visar en anordning för utförande av sättet enligt den föreliggande uppfinningen.The invention will be explained in more detail by describing an exemplary embodiment with reference to the accompanying drawing which schematically shows a device for carrying out the method according to the present invention.
I den i figuren illustrerade anordningen betecknar 1 en virvelbäddpanna.In the device illustrated in the figure, 1 denotes a fluidized bed boiler.
Ledningar för tillförsel av bränsle och luft och för uttag av aska som är av konventionellt slag, visas inte i figuren då de inte berör uppfinn- ingen. I pannan förbrännes kol som är förorenat med små mängder kvick- silver. Från pannan avledes rökgaser via ledningen 2. Rökgaserna har ett tryck som något överstiger atmosfärstryck och en temperatur av 700 OC.Lines for the supply of fuel and air and for the extraction of ash which are of a conventional type are not shown in the figure as they do not relate to the invention. Coal, which is contaminated with small amounts of mercury, is burned in the boiler. Flue gases are discharged from the boiler via line 2. The flue gases have a pressure that slightly exceeds atmospheric pressure and a temperature of 700 OC.
Rökgaserna i ledningen 2 mottager kallare rökgaser som skall beskrivas senare från ledningen 3 så att rökgaserna i ledningen 4 får en lägre temperatur, något under 600 °C. I ledningen 4 är anordnad en värme- växlare 5 för tillvaratagande av rökgasernas värme. Efter passagen av värmeväxlaren har rökgaserna i det exemplifierade fallet en temperatur av omkring 180 OC. En del av de rökgaser som passerat värmeväxlaren 5 inThe flue gases in line 2 receive colder flue gases which will be described later from line 3 so that the flue gases in line 4 have a lower temperature, slightly below 600 ° C. A heat exchanger 5 is arranged in the line 4 for utilizing the heat of the flue gases. After the passage of the heat exchanger, the flue gases in the exemplary case have a temperature of about 180 OC. Some of the flue gases that have passed the heat exchanger 5 in
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8802093A SE463653B (en) | 1988-06-06 | 1988-06-06 | Method for removing mercury from flue gases |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8802093A SE463653B (en) | 1988-06-06 | 1988-06-06 | Method for removing mercury from flue gases |
Publications (3)
Publication Number | Publication Date |
---|---|
SE8802093D0 SE8802093D0 (en) | 1988-06-06 |
SE8802093L SE8802093L (en) | 1989-12-07 |
SE463653B true SE463653B (en) | 1991-01-07 |
Family
ID=20372525
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE8802093A SE463653B (en) | 1988-06-06 | 1988-06-06 | Method for removing mercury from flue gases |
Country Status (1)
Country | Link |
---|---|
SE (1) | SE463653B (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991012877A1 (en) * | 1990-02-22 | 1991-09-05 | Platen Magnus H Von | Method and means for removing mercury from the fumes from an incinerator |
WO1992010240A1 (en) * | 1990-12-14 | 1992-06-25 | Platen Magnus H Von | A method for chemical destruction of heavy metals in toxic waste |
WO1995017240A1 (en) * | 1993-12-20 | 1995-06-29 | Niro A/S | Method for inproving the mercury removal capability of a flue gas purification system |
WO1999004913A1 (en) * | 1997-07-07 | 1999-02-04 | Bjästa Återvinning Ab | Method and arrangement for destruction of hazardous waste |
CN110681345A (en) * | 2019-09-10 | 2020-01-14 | 沈阳鑫迪环境技术有限公司 | Preparation method of selenium-loaded and sulfur-loaded demercuration material |
US11077425B2 (en) | 2016-09-02 | 2021-08-03 | Regents Of The University Of Minnesota | Systems and methods for body-proximate recoverable capture of mercury vapor during cremation |
-
1988
- 1988-06-06 SE SE8802093A patent/SE463653B/en not_active IP Right Cessation
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991012877A1 (en) * | 1990-02-22 | 1991-09-05 | Platen Magnus H Von | Method and means for removing mercury from the fumes from an incinerator |
WO1992010240A1 (en) * | 1990-12-14 | 1992-06-25 | Platen Magnus H Von | A method for chemical destruction of heavy metals in toxic waste |
WO1995017240A1 (en) * | 1993-12-20 | 1995-06-29 | Niro A/S | Method for inproving the mercury removal capability of a flue gas purification system |
WO1999004913A1 (en) * | 1997-07-07 | 1999-02-04 | Bjästa Återvinning Ab | Method and arrangement for destruction of hazardous waste |
US11077425B2 (en) | 2016-09-02 | 2021-08-03 | Regents Of The University Of Minnesota | Systems and methods for body-proximate recoverable capture of mercury vapor during cremation |
CN110681345A (en) * | 2019-09-10 | 2020-01-14 | 沈阳鑫迪环境技术有限公司 | Preparation method of selenium-loaded and sulfur-loaded demercuration material |
Also Published As
Publication number | Publication date |
---|---|
SE8802093L (en) | 1989-12-07 |
SE8802093D0 (en) | 1988-06-06 |
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