新型高活性吸收剂脱硫脱硝实验及机理研究

Experimental Studies on Desulfurization and Denitrification with a New Type of Highly Reactive Absorbent and the Effective Mechanism

以粉煤灰、石灰、添加剂为原料,采用干法工艺制备了具有氧化能力的高活性吸收剂。在烟气管道进行了同时脱硫脱硝的实验,研究了影响脱除效率的若干因素。探讨了高活性吸收剂脱硫脱硝的机理。试验结果表明,在Ca/(S+N)克分子比为1.2时,SO2和NOx的脱除效率分别为84%和61%。产生的废物为干粉状。最佳的烟气温度为60°C,烟气湿度为5%。与传统的干法FGD相比,该工艺具有费用低、设备简单、废物易于处置等优点,可为工业化应用提供有益参考。

The employed highly reactive absorbent with oxidizing capability was prepared in an anhydrous process by using fly ash, lime and some additives as the raw materials. Simultaneous desulfurization and denitrification tests were carried out in a flue duct, with the object of detecting the factors that effect the efficiency of purification. The purification mechanism of highly reactive absorbents is being discussed. Test results show that with a Ca/（S ＋ N） molar ratio of 1.2, the purification efficiencies of SO2 and NOx removal are 84% and 61% respectively. The waste left over appeared in the form of dry powder. The optimal gas temperature is 60℃, and the optimal humidity is 5 %. Compared with traditional dry FGD methods, this technology has the advantage of lower expenses, simpler equipment and facile disposal of wastes. It may serve as a valuable reference for industrial application. Figs 8 and refs 10.