Renewable Amine Flue Gas Desulfurization

Experimental studies of flue gas desulfurization process by renewable alnine were carried out through the establish of the simulated flue gas desulphurization devices. The experimental results indicated that the ethylenediamine had a good desulfuration performance. Experiment added acid as additives to reduce the volatilization of the ethylenediamine in the absorption and desorption process, and its also can improve the efficiency of desulfurization. The efficiency of desulfurization was better when added medium acid or weak acid. The ethylenediamine/phosphoric acid aqueous solution, ethylenediamine/boric acid aqueous solution and ethylenediamine/citric acid aqueous solution had the potentiality of industrial application. Take the cost of raw material in to consideration, experiment selected ethylenediamine/phosphoric acid aqueous solution as absorbent.Chosen the ethylenediamine/phosphoric acid aqueous solution as the absorbent, teachnology conditions of absorption and desbsorption were researched in theΦ250mm×360mm packed tower. The experimental results indicated that high iquid/gas ratio, low absorption temperature, high concentration of the barren solution and high pH could help to promote the efficiency of absorption. Optimization of condition under laboratory scale was fix as following: the liquid/gas ratio was 0.8L/m³ï½ž0.9L/m³, the absorption temperature was 50℃～55℃, the concentration of ethylenediamine was 0.3mol/L, initial pH value of the barren solution was 7.0. The reaction temperature of the desorption was 100℃～106℃, the initial value pH of the rich solution was about 5.5. The efficiency of desulphurization was about 99% and the desorption efficiency was about 90%, under this condition. The absorbent can be reused for many times and gain the byproducts SO₂.Based on the experimental results of lab experiment, chosen the power plant as a target, the designed condition were: gas treatment capacity was 6×10⁴Nm³/h, desulfurization effect was 98%, the concentration of SO₂ was 5000×10^-6. The diameters of the packed tower was 3400mm, the height of the tower was 1300mm.