为了增加燃煤烟气中氯化物的含量、提高选择性催化还原脱硝装置催化剂对零价汞(Hg⁰)的氧化效率,将模拟脱硫废水电解产物回喷至烟道内。将不同浓度HCl溶液(0~0.5 mol/L)添加到模拟脱硫废水中,随着HCl溶液浓度的增加,氯离子脱除量和脱除率均先增大后减小,在0.3 mol/L达到最大值;Cl₂在电解产物中所占比例也是先增大后减小,在0.4 mol/L达到最佳值。将模拟脱硫废水电解产物回喷至烟道内,选择性催化还原脱硝装置催化剂对Hg⁰的氧化效率均有很大程度的提高,当将加入0.3 mol/L HCl溶液模拟脱硫废水电解产物回喷至烟道内时,Hg⁰氧化效率达到最大值94.9%。

The electrolytic products of simulated desulfurization wastewater is sprayed back into flue gas to increase the content of chlorides in the flue gas and improve the oxidation efficiency of Hg⁰ over selective catalytic reduction catalysts.Firstly,different concentrations of HCl solution (0 mol·L^-1-0.5 mol·L^-1) is added into the simulated desulfurization wastewater to study the impacts of HCl concentrations.As the concentrations of HCl solution increases from 0 mol·L^-1 to 0.5 mol·L^-1,both the removal amount and rate of Cl^- increase firstly and decreases then,and reach the maximum values when the concentrations of HCl solution is 0.4 mol·L^-1.The catalyst in the selective catalytic reduction denitrification unit exhibits a great improved oxidation efficiency for zero valent mercury when the electrolytic products of simulated desulfurization wastewater are sprayed back into the flue.The oxidation efficiency of Hg⁰ reaches 94.9% as the maximum when the simulated desulfurization wastewater added with 0.3 mol·L^-1 of HCl solution is sprayed back into the flue.

刘世念(1971-),男,博士,正高级工程师,研究方向为水污染控制与给水净化,lsn23433@163.com