基于水力空化强化的ClO2脱硝研究

Study on denitrification using ClO2 based on hydrodynamic cavitation strengthening

为提高湿法氧化脱硝的效率,提出了使用水力空化强化脱硝的方法.水力空化强化ClO2脱硝的试验结果发现:使用水力空化反应器能够产生大量含有NO混合气的空化气泡,单个气泡的直径约为鼓泡脱硝试验产生气泡的1/37.4,大量空化气泡的产生极大扩展了气液接触面积;使用质量分数为1.0×10-6的ClO2进行水力空化脱硝,脱硝率超过90%以上的时间为90 s,而鼓泡脱硝则为0 s;提高ClO2质量分数能够延长高效脱硝的时间,但同时会导致更多NO2产生,脱硝率降低.该试验方法极大提高了湿法脱硝的效率.

To improve the efficiency of wet oxidation method denitration,a hydrodynamic cavitation enhanced denitrification method was proposed.Experimental results of hydrodynamic cavitation strengthening chlorine dioxide denitrification show that hydrodynamic cavitation reactor could produce a large number of cavitation bubbles containing a mixture of nitric oxide,and the diameter of a single bubble is about 1/37.4 of that generated by the bubbling denitration experiment.Large amount of cavitation bubbles greatly expands the gas-liquid contact area.Using chlorine dioxide with a mass fraction of 1.0×10-6,the duration for denitrification rate over 90%is 90 s for hydrodynamic cavitation reactor,while for the bubbling reactor is 0 s.Increasing the mass fraction of chlorine dioxide could prolong the duration of efficient denitrification,but lead to more nitrogen dioxide production and lower denitrification rate meanwhile.The proposed method dramatically improves the efficiency of wet denitration.