臭氧氧化—湿式钙法吸收工艺对烟气的同时脱硫脱硝

采用臭氧氧化—湿式钙法吸收工艺对模拟烟气进行同时脱硫脱硝处理。O₃于150 ℃下具有较高的热稳定性,可将NO氧化为高价态氮氧化物,且NO氧化率随n（O₃）∶n（NO）的增大而逐渐提高。烟气中SO₂和H₂O的存在对NO氧化率的影响不大。O₃对SO₂的氧化率较低,约为5%。3%（w）石灰石浆液对SO₂的吸收率接近100%,NO_x吸收率随n（O₃）∶n（NO）的增大而逐渐提高,当n（O₃）∶n（NO）为1.6时NO_x吸收率可达约65%。SO₂能促进吸收液对NO_x的脱除。石灰石浆液中加入0.2%（w）的（NH₄）₂SO₃或Na₂SO₃后NO_x吸收率可达约85%或82%,且吸收率随添加剂加入量的增加而提高,添加（NH₄）₂SO₃的NO_x吸收率略高于添加Na₂SO₃。

Simultaneous desulfurization and denitration of flue gas by ozone oxidation-wet calcium absorption process

The simulated flue gas was treated by simultaneous desulfurization and denitration process of ozone oxidation-wet calcium absorption. The results indicated that O₃ was stable under 150 ℃ and could oxidize NO to nitrogen oxides with higher valence,and the NO oxidation rate was increased with the increasing of n（O₃）∶n（NO）. The present of SO₂ and H₂O in the flue gas had a slight effect on NO oxidation rate. The oxidation rate of SO₂ by O₃ was low（about 5%）. The SO₂ absorption rate reached nearly 100% by 3%（w）CaCO₃ slurry. The NO_x absorption rate was increased with the increase of n（O₃）∶n（NO）and reached 65% when the n（O₃）∶n（NO）was 1.6. SO₂ could facilitate the removal of NO_x in absorption solution. Adding 0.2%（w）（NH₄）₂SO₃ or Na₂SO₃ into the CaCO₃ slurry,the NO_x absorption rate reached about 85% or 82%,and was increased with the increasing of addictive amount. The NO_x absorption rate with（NH₄）₂SO₃ was slightly higher than that of Na₂SO₃.