臭氧氧化—钙法吸收同时脱硫脱硝的试验研究

SIMULTANEOUS DESULFURIZATION AND DENITRIFICATION BY OZONE OXIDATION AND CA(OH)_2 ABSORPTION-STUDY ON NO_x REMOVAL

针对国内某石化企业CFB锅炉烟气特点,进行实验室烟气模拟,采用臭氧氧化—钙法吸收同时脱硫脱硝工艺进行小试研究。实验采用臭氧将NO氧化为NO2,再通入鼓泡反应器中与Ca(OH)2浆液发生吸收反应,达到同时脱硫脱硝的目的。实验结果表明:NOx脱除率与臭氧投加量成正比,当臭氧投加量为1.1时,NOx脱除率可达到90%以上;SO2初始浓度的变化对NOx脱除率影响不大;NO初始浓度和烟气含氧量对SO2脱除率影响效果均不显著;烟气含氧量的增大有利于NOx的脱除。

According to the characteristic of the flue gas from a refinery company, simulated flue gas was prepared and ozone oxidation combining with Ca（OH）2 absorption was studied in a laboratory scale. The experiment adopted ozone to convert NO into NO2, which was then introduced into bubble reactor to react with Ca（OH）： slurry as an absorption reaction to achieve desulphurization and denitration simultaneously. Be- sides, flue gas flow, ozone dosages （O3/NO mole ratio）and NO initial concentration were investigated, The re- suits showed that NOx removal was proportional to ozone dosage. When OyNO molar rate was 1.1 ,NOx re- moval efficiency increased to above 90%. SO2 initial content slightly influenced the removal of NOx. NO initial content and flue gas content influenced NOx removal slightly. More oxygen in flue gas was good for NOx re- moval. The experimental results provide the basis for commercial application.