臭氧氧化法应用于燃煤烟气同时脱硫脱硝脱汞的实验研究

EXPERIMENTAL RESEARCH FOR THE APPLICATION OF O_3 OXIDATION IN SIMULTANEOUS REMOVAL OF SO_2,NO AND Hg IN COAL-FIRED FLUE GAS

在固定床反应器上,以模拟烟气为对象研究了O3对NO和Hg0的去除作用。结果表明:温度低于150℃时O3对NO氧化效率几乎不随温度变化,高于150℃时由于O3分解导致NO氧化效率随温度升高而降低;O3对NO氧化效率随n(O3)/n(NO)增大而升高,当n(O3)/n(NO)超过1.0时增加放缓。O3对Hg0氧化效率随温度升高先增后降,在150℃时效率最高,可达近90%;随n(O3)/n(Hg0)增大而升高,当n(O3)/n(Hg0)超过30000后氧化效率几乎不再增加。当三种污染物同时存在时,O3对Hg0的氧化作用受到一定程度的抑制,但对NO氧化效率与单独被O3氧化时无明显差异。

Simultaneous removal of NOxand Hg in simulated flue gas was studied in a quartz reactor within an electrical heated furnace. Results show that the oxidation efficiency of NO nearly has no change when the temperature is lower than 150 ℃,and it decreases with temperature higher than 150 ℃ because of O3 decomposition. The oxidation efficiency first increases in proportion to O3/NO mole ratio,while it increases slowly when O3/NO mole ratio is larger than 1. 0. The oxidation efficiency of Hg0 first increases with temperature and then falls down,and the efficiency under the optical temperature,150 ℃,is nearly90%. The oxidation efficiency first increases with O3/Hg0 mole ratio and then becomes stabilized when O3/Hg0 mole ratio is larger than 30000. When the three pollutants exist together,the oxidation efficiency of Hg0 by O3was inhibited to some extent,but that of NO has no obvious difference by O3 separately.