Scrubber plume
Scrubber plume
(OP)
I am interested in the formation of SO3 aerosol plumes from combustion operations involving sulfur in the material being burned. Particularly I'd like to find some way to influence the SO2 / SO3 conversion ratio in order to minimize the plume.





RE: Scrubber plume
RE: Scrubber plume
In many cases, however, the plume is just slightly more prominent than allowed by law. If a process change can nudge it back over the line, lots of money can be saved by the plant operator. I'd like to hear from anyone, but preferably someone who has tried and succeeded.
RE: Scrubber plume
RE: Scrubber plume
With regards to influencing the SO2/SO3 ratio it is impossible. With 1.5% excess O2 there will always be 1.5 mole% SO3 and 98.5 mole% SO2 at 1800 F. I ran a sinulation and had to go oxygen deficient inorder to eliminate the SO3. At this point I had incomplete combustion.
RE: Scrubber plume
RE: Scrubber plume
RE: Scrubber plume
RE: Scrubber plume
RE: Scrubber plume
Is there any ammonia in the surrounding air? That will give you a lovely blue plume!
RE: Scrubber plume
yes they are injecting ammonia for contro; of Nox i believe. Why does ammomnia cause a blue plume? ANd this unit has the SCR's on it also, but there hasnt been any high levels at SO3 at this plant, as thought. There has been no testing to see what ammonia is coming out of the stack and i believe there will be testing for this soon, but the SCR will be out of service until next March probably. Thats what i do, go around testing the plants for SO3 after the SCR's are in service. Thnx for the replies.
Easel,
We have saw a rise in SO3 with some plants with SCR's, but at this one there has been no increase, the other plant that did increase is scrubbed and has put in three systems to decrease the SO3. MAg, Water and Lime.
RE: Scrubber plume
Ammonia will react with any SO2/SO3 in the exhaust gas to form solid ammonium sulphite/sulphate. The blue colour is due to the extremely small (sub-micron) particle size, which also makes such fumes fairly difficult to arrest. It sounds as if the SCR unit needs tuning up a bit; in most "environmentally advanced" countries the permitted ammonia emission levels from SCR are very low.
RE: Scrubber plume
RE: Scrubber plume
I would review the NH3 slip on the SCR before adding additional equipment.
mstainbrook
stainbrook@angelfire.com
IT/Controls/Environmental Equip Eng