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You are right to expect corrosion on the flue gas side of the preheat exchanger if the acid gas dewpoint is high enough in the flue gas. Have you calculated the dewpoint yet? Using waste steam to preheat the cold air is a good approach in this case, if maximum heat recovery is needed. Steam...

Thank you for the idea. Typically the incinerator stack is isolated from the rest of the plant, so dilution with another hot stream is usually not available for cost reasons. We could reheat the stack gas using a separate burner at the stack, but I think calculating the minimum fuel needed to...

I am seeing a similar problem with Rosemount mag flowmeters on the circulating lines in an SO2/HCl caustic scrubber. Normal addition of NaOH for pH control has no bad effect, but sudden quick addition quickly drops the flow signal. When the NaOH pulse makes its way back down the scrubber we...

Historian: thanks for writing. I had found the catalytic effect you mentioned, but believe the amount of NOx present in most (or all) normal combustors may be enough to cause visible SO3 plumes. I'm still looking for someone's real-world experience about incinerator NOx vs. SO3 plume formation!

Yes, I've considered the "ultimate" solution.<br> 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...

It looks to me like SO3 formation in an NCG incinerator may depend in part on the NOx present in the furnace exhaust.<br> I'm looking for someone who has noticed an effect like that, maybe a lesser SO3 plume after changing to a low-NOx burner, or a change in the plume associated with a change in...

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.