Ca系およびNa系吸収剤による塩化水素吸収特性に及ぼすH₂O, CO₂の影響

抄録

For effective HCl gas removal from waste incineration, the effect of H₂O and CO₂ on HCl sorption with CaO and Na₂CO₃ was studied. Experiments of HCl sorption were conducted in a gas flow-type tubular reactor packed with CaO and Na₂CO₃ fine particles under 5 μm in the diameter, at the temperatures 473-1073 K. The mixed gas of HCl (1000 ppm), H₂O (10 vol%) or CO₂ (10 vol%) and N₂ (balance), was introduced into the reactor at a flow rate of 3.00×10^-4m³·min^-1.
As the results, a maximum conversion value of 0.69 for HCI sorption by CaO was obtained at 873 K in N₂ atmosphere. With the presence of H₂O and CO₂, the conversions decreased to 0.49 and 0.40, respectively. It was found that H₂O was influential on HCl sorption in whole reaction period, while the influence of CO₂ appeared after the conversion attained 0.18 A maximum conversion value of 0.76 for HCl sorption by Na₂CO₃ was obtained at 673 K in N₂ atmosphere. With the presence of H₂O, the conversion decreased to 0.64. The influence of H₂O 0n HCl sorption by Na₂CO₃ was smaller than that by CaO. Moreover, HCl sorption by Na₂CO₃ was not appreciably affected by CO₂.