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COMPARISON OF MERCURY CAPTURE EFFICIENCIES OF THREE DIFFERENT IN SITU GENERATED SORBENTS
Citation:
Lee, T. G., E J. Hedrick, AND P. Biswas. COMPARISON OF MERCURY CAPTURE EFFICIENCIES OF THREE DIFFERENT IN SITU GENERATED SORBENTS. AMERICAN INSTITUTE OF CHEMICAL ENGINEERS JOURNAL 47(4):954-961, (2001).
Impact/Purpose:
To evaluate three different sorbent materials (Ti, Si and Ca based) for their mercury capture efficiencies in an entrained flow reactor.
Description:
Three different sorbent materials (Ti, Si and Ca based) were compared for their mercury capture efficiencies in an entrained flow reactor. Agglomerated particles with a high specific surface area were generated in situ by injecting gas phase sorbent precursors into a high temperature furnace reactor. Titania particles in the presence of uv irradiation were most effective at mercury capture (>98%). In situ generated CaO particles had a capture efficiency of 33% (without any uv irradiation), while SiO2 was completely ineffective at mercury capture. The efficiency of elemental mercury capture of both CaO and Tio2 particles decreased with increasing SO2 concentration. The increase in the feed rate of the Ti sorbent resulted in a recovery of the higher mercury capture efficiency due to the availability of more active sites. The in situ generated titania sorbents were also effective at mercury capture (>87%) at elevated temperatures (160oC).