Abstract:

In the process of Flue Gas Desulfurization (FGD) with sodium citrate buffer , the absorbed SO₂ is much easy to be oxidized to form sodium sulfate , thus resulting in the great consumption of sodium cÏtrate and the heavy plugging of facilities by sodium .sulfate. In order to effectively decrease the production of sodium sulfate effectively in the absorption solution , some measures are presented , such as , adjusting the pH value in the absorption solution , shortening the operation time per absorption period , adopting the liquid Claus reaction and minimizing the O₂ fugivity in flue gas. It is revealed that , given the condition that the Ci^3- concentration is 0. 1 moVL, the pH value is 4. 50 - 4. 00 , the operation time is 4 h and the fugivity η₀₂ is 8% , the SO₄^2- concentration gradient in the absorption solution decreases to0. 09 g/ (L•h).

Key words: Flue Gas Desulfurization, sodium citrate buffer, sodium sulfate, control