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研究报告

The removal of SO₂ in flue gas with pulsed corona discharge using wastewater from a blast furnace

摘要：采用自行设计的针-针式电极结构的等离子体反应器装置,在脉冲电晕放电作用下利用武汉钢铁(集团)公司2^#焦炉的高炉煤气洗涤水进行了烟气脱硫模拟试验.考察了喷淋水种类、循环次数、液气比、电压峰值对SO₂去除效果的影响,并对脱硫的产物进行了分析;考察了脉冲放电、SO₂对氰化物去除效果的影响.研究结果表明:高炉煤气洗涤水具有较好的脱硫效果,脱硫效率随着高炉煤气洗涤水循环次数的增加而降低,液气比存在最佳值;脉冲电晕放电有助于提高脱硫效果;脱硫产物硫酸根的含量随着脉冲电压峰值、循环次数以及模拟烟气流量的增加而增加.在通入SO₂和空气的条件下,高炉煤气洗涤水在脉冲电晕区域停留时间约为2.1s时,氰化物去除率最高可达99.9%.

Abstract：Laboratory tests were conducted for removal of SO₂ from simulated flue gas and simultaneous treatment of wastewater from a blast furnace,by pulsed corona discharge specifically from 2^# Blast Furnace of Wuhan Iron and Steel (Group) Corporation. Pulsed corona discharge was conducted using a new kind of reactor with a needle-needle electrode designed for this research. The influence of spray water,cycle index,L/G ratio (the ratio between wastewater spay quantity and flue gas flow) and applied pulsed voltage on the removal ratio of sulphur dioxide are considered. The effects of pulsed corona discharge and SO₂ on the removal ratio of cyanide were also studied. Results showed that the wastewater from the blast furnace has excellent desulphurization ability and the pulsed corona discharge plasma can enhance the desulphurization efficiency. It was also observed that the SO₂ removal ratio decreased along with increased cycle index. There is an optimal value of L/G for the SO₂ removal ratio. The content of sulphate ion produced in the wastewater increased with the increment of applied pulsed voltage,cycle index,and the flux of flue gas. Furthermore,the removal rate of cyanide in the wastewater from the blast furnace can reach 99.9% with a residence time of 2.1s in the pulsed corona zone during the desulphurization process.