公开(公告)号：US20210170334A1

公开(公告)日：2021-06-10

申请号：US16768716

申请日：2018-03-20

申请人： INSTITUTE OF PROCESS ENGINEERING, CHINESE ACADEMY OF SCIENCES

发明人： Tingyu Zhu ,  Xiaolong Liu ,  Xue Wang ,  Ruliang Ning

IPC分类号： B01D53/86 ,  B01D53/90 ,  B01D53/18 ,  B01D53/75 ,  B01D53/80 ,  B01D53/14

摘要： Disclosed are a system and a method for desulfurization and denitrification of an alumina calcination flue gas, and a use. The system comprises an ozone generator (1), a red mud pre-impregnation slurry scrubbing tower (3), and a red mud pre-impregnation tank (5) and a red mud pre-impregnation clear liquid scrubbing tower (10). NOx in a flue gas is oxidized into a high valence oxynitride by ozone, and with the red mud as an absorbent, the synergistic absorption of SO2 and NOx in the flue gas is achieved, while the dealkalization of the red mud is achieved. By means of the synergistic catalytic oxidation of metal ions such as Fe3+ in a red mud slurry and ozone, the synergistic absorption of sulfur and oxynitride is prompted and the material consumption of the subsequent desulfurization and denitrification is reduced; and the use of a structure of staged absorption in two towers overcomes the problem of the difficulty in absorbing NO2 with a low O3/NOx molar ratio by enhancing absorption with sodium alkali in a second stage tower, while decreasing the consumption of and risk of escape of the ozone, wherein same has the advantages of a high purification efficiency and a low operation cost, and has a stronger applicability to the alumina calcination flue gas.

公开(公告)号：US11090608B2

公开(公告)日：2021-08-17

申请号：US16768716

申请日：2018-03-20

申请人： INSTITUTE OF PROCESS ENGINEERING, CHINESE ACADEMY OF SCIENCES

发明人： Tingyu Zhu ,  Xiaolong Liu ,  Xue Wang ,  Ruliang Ning

IPC分类号： B01D53/14 ,  B01D53/18 ,  B01D53/75 ,  B01D53/80 ,  B01D53/86 ,  B01D53/90

摘要： Disclosed are a system and a method for desulfurization and denitrification of an alumina calcination flue gas, and a use. The system comprises an ozone generator, a red mud pre-impregnation slurry scrubbing tower, and a red mud pre-impregnation tank and a red mud pre-impregnation clear liquid scrubbing tower. NOx in a flue gas is oxidized into a high valence oxynitride by ozone, and with the red mud as an absorbent, the synergistic absorption of SO2 and NOx in the flue gas is achieved, while the dealkalization of the red mud is achieved. By means of the synergistic catalytic oxidation of metal ions such as Fe3+ in a red mud slurry and ozone, the synergistic absorption of sulfur and oxynitride is prompted; and the use of a structure of staged absorption in two towers overcomes the problem of the difficulty in absorbing NO2 with a low O3/NOx molar ratio.