NO REMOVAL AND NITROGEN CONVERSION PERFORMANCE BY O<sub>3</sub> OXIDATION COMBINED WITH WET ABSORPTION

SUN Ye; LI Shuaishuai; PANG Linlin; HU Xiaotu; LI Jie; LIU Yong; ZHONG Lu; ZHU Tianle

doi:10.13205/j.hjgc.202211024

Volume 40 Issue 11

Nov. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(11): 171-176

SUN Ye, LI Shuaishuai, PANG Linlin, HU Xiaotu, LI Jie, LIU Yong, ZHONG Lu, ZHU Tianle. NO REMOVAL AND NITROGEN CONVERSION PERFORMANCE BY O3 OXIDATION COMBINED WITH WET ABSORPTION[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 171-176. doi: 10.13205/j.hjgc.202211024

Citation:

SUN Ye, LI Shuaishuai, PANG Linlin, HU Xiaotu, LI Jie, LIU Yong, ZHONG Lu, ZHU Tianle. NO REMOVAL AND NITROGEN CONVERSION PERFORMANCE BY O₃ OXIDATION COMBINED WITH WET ABSORPTION[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 171-176. doi: 10.13205/j.hjgc.202211024

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NO REMOVAL AND NITROGEN CONVERSION PERFORMANCE BY O₃ OXIDATION COMBINED WITH WET ABSORPTION

doi: 10.13205/j.hjgc.202211024

1. School of Space and Environment, Beihang University, Beijing 102206, China;
2. Guangdong J-Tech Environment Science Co., Ltd, Guangzhou 510663, China;
3. Yanshan Iron and Steel Co., Ltd, Tangshan 130220, China

Received Date: 2021-12-17
Available Online: 2023-03-24

Abstract

Abstract

The denitrification technology using ozone oxidation combined with wet absorption can be used in the purification of flue gas with relatively low temperature (<150℃) and NO_x concentration (<400 mg/m³), such as the flue gas from steel sintering, coke oven and ceramics industries. The technology has the advantages of higher SO₂ and NO_x removal efficiency, simpler equipment, relatively lower construction and operation cost. The physicochemical behaviors of ozone oxidation combined with the liquid phase absorption denitrification process was firstly analyzed. The distribution of nitrogen products from both gas-phase NO oxidation and gas-phase oxidation combined with wet absorption were investigated by Fourier infrared spectroscopy and ion chromatography, and the nitrogen conversion was calculated. The results showed that the O₃/NO molar ratio and water solubility were the key factors affecting the degree of NO oxidation and NO_x removal efficiency. When the O₃/NO molar ratio was higher than 1.5, NO oxidation products were mainly N₂O₅ and HNO₃, and their water solubility was equivalent to SO₂. Thus, NO_x could be effectively removed in the traditional desulfurization absorber, and the product was NO₃^- with good stability. The nitrogen conversion rate was close to 99%, and the undetectable nitrogen components could be ignored or never exist.
- ozone oxidation,
- absorption,
- denitrification,
- molecular diffusion,
- water solubility,
- nitrogen conversion

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References(22)

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