Quantitative K-Cl-S chemistry in thermochemical conversion processes using in situ optical diagnostics

The sulfation of gas-phase KOH and KCl was investigated in both oxidizing reducing atmospheres at temperatures 1120 K, 1260 1390 1550 K. Well-defined gas environments were generated a laminar flame burner fuelled with CH4/air/O2/N2. Atomized K2CO3 water solution fog SO2 introduced into the hot as sources potassium, chlorine, sulfur, respectively. situ concentrations KOH, KCl, OH radicals measured using broadband UV absorption spectroscopy, concentration K atom TDLAS 769.9 nm 404.4 nm. nucleated condensed K2SO4 aerosols visualized illuminated by green laser sheet. With addition, reduced gas. more significant for low temperature cases. sulfated rapidly than KCl. aerosols, formed homogeneous nucleation, observed below At no formed, indicating that consumed transformed gaseous KHSO4 or K2SO4. atoms flue addition enhanced consumption except high-temperature case seeding atom, resulting less radical consumption. Studies also conducted environment 1140 an equivalence ratio 1.31. Similar to observation atmosphere, decreased dramatically seeding. An unknown spectrum attributed KOSO. experimental results used evaluate detailed K-Cl-S reaction mechanism, reasonable agreement obtained.