胺类吸收剂模拟烟气脱硫

以醇胺和乙二胺为原料，配制0.3 mol/L的水溶液，用于实验室模拟烟气脱硫的研究。通过碘量法测定脱硫率，采用离子色谱测定SO₂吸收容量、吸收液中SO₂的氧化率和解吸率，同时探讨了循环次数对脱硫率和富液中SO₂含量的影响。结果表明，吸收进行30 min时，吸收液的脱硫率均保持在99 %以上，60 min时，乙二胺类溶液的脱硫率仍达99 %，醇胺吸收液脱硫效果明显下降。乙二胺溶液对SO₂ 的吸收容量为455 mg/L，远远高于醇胺类吸收液。若乙二胺溶液中加入硼酸，则其对SO₂的吸收容量略低(450 mg/L)，但提高了溶液的抗氧化性，吸收液中SO₂的氧化率由1.14 %减至0.29 %，同时解吸率由38.0 %增至59.0 %。10次吸收-解吸循环实验数据显示，乙二胺/硼酸溶液的平均脱硫率均在99 %以上，富胺液中SO₂含量由0.44 mol/L减至0.40 mol/L，表明吸收液的脱硫性能良好，可以作为烟气脱硫剂。

Desulfurization of Flue Gas Simulated with Amine Solution

Experimental research on the desulfurization of flue gas simulated with 0.3 mol/L amine solutions prepared with ethanolamine, ethylenediamine and so on. Desulfurization efficiency was studied by iodometry titration. Absorption capacity of SO₂, oxidation of absorbed SO₂ and desorption efficiency of SO₂ were researched via ion chromatography. Meantime, cycles on the desulfurization efficiency and SO₂ content of rich absorbent were studied. The results show that the desulfurization efficiency of all the absorbents were maintained 99 % for 30 min. After 60 min, the desulfurization efficiency of ethylenediamine solutions reached 99 %, but the desulfurization efficiency of alcohol amine solutions decreased significantly. The absorption capacity of the ethylenediamine solution for SO₂ was 455 mg/L, much higher than that of the alcohol amine solution. Boric acid was added to the ethylenediamine solution, the absorption capacity of the solution for SO₂ was slightly lower(450 mg/L), but oxidation efficiency of absorbed SO₂ reduced from 1.14 % to 0.29 %. At the same time, the desorption efficiency of SO₂ increased from 38.0 % to 59.0 %. Absorption-desorption cycle experimentals indicated that the average desulfurization efficiency of the ethylenediamine/boric acid solution reached above 99 %, and SO₂ content of rich absorbents decreased from 0.44 mol/L to 0.40 mol/L. The results suggest the desulfurization effect of the ethylenediamine/boric acid solution is excellent as the flue gas absorbent.