[mosesdapoet]

What is an FB unit ? Is that the scrubber system to reduce CO2 or whatever gasses from coal fired electric generation ?

At the end of this article which dwells on the consumers woes and ills dwelling on the stuff comming from China.
But not on the sources which would have been helfull,

The article concluds after umpteen paragraphs with finnally mentioning Knauf Plasterboard (a German plasterboard manufacturer) of Tiayin China as the source of the questionable gypsum. But were they the co-owners of the plant making the stuff or a was this a subcontracted deal with the plant which manufactured the stuff under their label. In either case Knauf is responsible for the products quality but it got off lightly in this report...must have been a big Obama contributer (sarc)

[Eric in the Ozarks]

Fluidized Bed. In the 1970s and 80s, it was the big solution to SO2. Coal is pulverized and injected, similarly to a big utility boiler and along with the coal, about 10 percent ground limestone is also injected into the mass. Looking in through a peek hole, the fire looks like its fluid or even molten. The claim is the FB technology collects 95 percent of the SO2 from the coal. Much of the coal from the Illinois Basin, where I was active, has a high sulfur content. Typically, the coal releases about 5 to 6 pounds of sulfur dioxide per million BTUs of burning coal. 95 percent reduction allows high sulfur coal to be used in new installations (per the Clean Air Act) which mandate no more than 1.2 pounds of SO2/MM BTUs.
Of course, now that this hurdle has been met, the kooks in Washington have come up with the fake bogeyman called CO2. Good luck collecting that.