添加剂强化煤浆法烟气脱硫实验研究
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摘要
煤浆法烟气脱硫基于液相催化氧化的原理,通过烟气中二氧化硫、氧气与煤中黄铁矿作用以达到脱除烟气中二氧化硫的目的,同时能够降低煤系黄铁矿硫含量。在烟气脱硫工艺中,添加剂的利用可以提高脱硫剂的脱硫性能,提高烟气脱硫效率,降低脱硫系统投资成本以及运行费用。
本研究以鼓泡反应器为主要实验设备,以N2、02和S02气体模拟烟气进行实验,筛选考察了不同添加剂对煤浆法烟气脱硫的影响。
随着反应的进行,烟气脱硫率,浆液pH值不断降低,浆液铁浸出率逐渐升高。实验表明,二氧化硅的添加量越大,对烟气脱硫的抑制作用越明显,而对铁的浸出率则影响不大；添加剂T0对煤泥和高硫原煤反应过程中烟气脱硫率变化趋势影响不同,但对pH值都有明显的缓冲作用,对铁的浸出率的影响也相同,随着加入量越大,煤中铁的浸出率越高；添加剂T1加入后初始pH值降低,离子强度的增大抑制了脱硫反应速率,使得脱硫率下降加速,而铁的浸出率由于T1中M元素的存在而得到提高；T2,T3和T4是较为合适的添加剂,它们的加入可以明显的提高脱硫效率,对浆液pH值及铁浸出率都有一定影响,同时实验得出了不同添加剂的合适添加浓度。
Coal slurry flue gas desulphurization (FGD) is based on aqueous catalytic oxidation. SO2 is removed from flue gas through the reaction with oxygen and coal pyrite. Fe2+/Fe3+ ions leached from pyrite served as catalyst and oxidant in the SO2 removal. At the same time, the content of sulfur in coal pyrite is reduced. In the flue gas desulphurization process, the use of additive can improve the performance of desulfurizer, enhance flue gas desulfurization efficiency, and reduce the investment and running costs of desulfurization system.
The flue gas was simulated by mixing N2, O2 and SO2. The influences of different additives on coal slurry FGD process were studied in a bubbling reactor and the enhancing additives were chosen.
As the reaction proceeding, the SO2 removal efficiency and the slurry pH value decreased, while the iron leaching rate of slurry increased constantly. The research showed that the more SiO2 used, the smaller desulphurization rate was, but the amount of SiO2 had little influence on the leaching of pyrite. For the coal slime and the high-sulfur coal, additive T0 had different influences on the flue gas desulphurization rates. Additive T0 played a very good buffer role to pH value. Whatever coal slime or the high-sulfur coal, the amount of additive T0 could enhance the leaching rate of iron from coal pyrite. Initial pH value decreased when additive T1 was used. The desulphurization rate was restrained by the increase of ionic strength. M element of T1 enhanced the iron leaching rate. T2, T3 and T4 were all appropriate additives, which could increase the desulphurization rate obviously. They also had some influence on the coal slurry pH value and iron leaching rate. Through experiments, the appropriate concentrations of different additives were determined.
本研究以鼓泡反应器为主要实验设备,以N2、02和S02气体模拟烟气进行实验,筛选考察了不同添加剂对煤浆法烟气脱硫的影响。
随着反应的进行,烟气脱硫率,浆液pH值不断降低,浆液铁浸出率逐渐升高。实验表明,二氧化硅的添加量越大,对烟气脱硫的抑制作用越明显,而对铁的浸出率则影响不大；添加剂T0对煤泥和高硫原煤反应过程中烟气脱硫率变化趋势影响不同,但对pH值都有明显的缓冲作用,对铁的浸出率的影响也相同,随着加入量越大,煤中铁的浸出率越高；添加剂T1加入后初始pH值降低,离子强度的增大抑制了脱硫反应速率,使得脱硫率下降加速,而铁的浸出率由于T1中M元素的存在而得到提高；T2,T3和T4是较为合适的添加剂,它们的加入可以明显的提高脱硫效率,对浆液pH值及铁浸出率都有一定影响,同时实验得出了不同添加剂的合适添加浓度。
Coal slurry flue gas desulphurization (FGD) is based on aqueous catalytic oxidation. SO2 is removed from flue gas through the reaction with oxygen and coal pyrite. Fe2+/Fe3+ ions leached from pyrite served as catalyst and oxidant in the SO2 removal. At the same time, the content of sulfur in coal pyrite is reduced. In the flue gas desulphurization process, the use of additive can improve the performance of desulfurizer, enhance flue gas desulfurization efficiency, and reduce the investment and running costs of desulfurization system.
The flue gas was simulated by mixing N2, O2 and SO2. The influences of different additives on coal slurry FGD process were studied in a bubbling reactor and the enhancing additives were chosen.
As the reaction proceeding, the SO2 removal efficiency and the slurry pH value decreased, while the iron leaching rate of slurry increased constantly. The research showed that the more SiO2 used, the smaller desulphurization rate was, but the amount of SiO2 had little influence on the leaching of pyrite. For the coal slime and the high-sulfur coal, additive T0 had different influences on the flue gas desulphurization rates. Additive T0 played a very good buffer role to pH value. Whatever coal slime or the high-sulfur coal, the amount of additive T0 could enhance the leaching rate of iron from coal pyrite. Initial pH value decreased when additive T1 was used. The desulphurization rate was restrained by the increase of ionic strength. M element of T1 enhanced the iron leaching rate. T2, T3 and T4 were all appropriate additives, which could increase the desulphurization rate obviously. They also had some influence on the coal slurry pH value and iron leaching rate. Through experiments, the appropriate concentrations of different additives were determined.
引文
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