液相生化法烟气脱硫实验研究

Experimental Study of Flue Gas Desulfuration by Using a Liquid-Phase Biochemical Method

将过渡金属（Fe^3＋／Fe^2＋电对）催化氧化与微生物代谢功能结合，利用铁离子昭’的强氧化性，将S（Ⅳ）氧化为S（Ⅵ），本身还原为Fe^2＋；利用微生物（DYBI）的代谢作用迅速将略’转化为Fe^3＋，二者协同作用完成脱硫循环。室内试验在液气比L／G：2．70～8．40L／m^3，输灰量：16-30g／min，湍球塔内风速：4—15m／s，铁离子浓度（以№03计算）：1．60～3．00g／L，prt：2．7～5．0．s02浓度：2574～5434mg／m^3下进行，结果表明，Fe^3＋浓度对于反应有明显控制作用，生成物Fe^2＋、SO4^2＋对反应有抑制作用，特别是Fe^2＋，由于其可与HS戗生成内界配合物，影响SO3^--自由基的产生，从而导致氧化还原反应的终止。加入DYBI后，可以有效地将Fe^2＋转化为Fe^3＋．使氧化还原反应得以持续．脱硫率在同等条件下和不加DYB1时相比高19～49个百分点。

By combining the transition metal(Fe3+/Fe2+ galvanic couple) catalytic oxidation with microbic metabolism function and making use of the strong oxidation of iron ion Fe3+,S(Ⅳ) can be oxidized to S(Ⅵ) with the iron ion Fe3+ being reduced to Fe2+ while the microbe(hereinafter referred to as DYB1 for short) metabolism function can be used to quickly convert Fe2+ to Fe3+.By a synergism of the latter two a desulfuration cycle can be completed.An indoor experiment was performed under the following parameter conditions:liquid/gas ratio,2.70～8.40 L/m3,amount of ash conveyed,16～30 g/min,wind speed inside the turbulence ball tower,4～15 m/s,concentration of iron ion,1.60～3.00 g/L(calculated on the basis of Fe2O3),pH value,2.7～5.0,concentration of SO2,2574～5434 mg/m3.The test results show that the concentration of Fe3+ plays an obvious role of controlling the reaction and the products generated Fe2+ and SO2-4 exercise an inhibitive role to the reaction,especially Fe2+,because the latter can react with HSO3 to produce an internal complex and affect the generation of SO·ˉ3 free radical,putting an end to the reduction reaction of oxidization.After DYB1 has been added,Fe2+ can be effectively converted to Fe3+,enabling the above-cited reduction reaction of oxidization to sustain and continue.The desulfuration rate can be 19～49 percentage points higher than that under same conditions and when no DYB1 has been added.