TIANJIN CEMENT INDUSTRY DESIGN AND RESEARCH INSTITUTE CO. LTD.

Research progress of nitrogen oxides (NOx) control technology for industrial flue gas

Lead picture ClipDealer; all others authors
Lead picture ClipDealer; all others authors
1 NOx emissions of China from 2013 to 2019 [1]
1 NOx emissions of China from 2013 to 2019 [1]
2 Fixed Industrial Resources NOx emissions of China from 2013 to 2019 [1]
2 Fixed Industrial Resources NOx emissions of China from 2013 to 2019 [1]
3 NOx emission from exhaust gas of centralized pollution treatment facilities of China [1]
3 NOx emission from exhaust gas of centralized pollution treatment facilities of China [1]
4 The classification of denitration technology
4 The classification of denitration technology
5 NOx removal efficiency and NH3 slip [4]
5 NOx removal efficiency and NH3 slip [4]
6 a) The influence of SO2 concentration (0, 50, and 100 ppm) on the NOx conversion of Mn1Fe0.25Al0.75Ox, Mn1Al1Ox, and 8 wt% Mn-8wt% Fe/γ-Al2O3 catalysts at 150 °C in 1h; b) The long-term isothermal NOx conversion of Mn1Fe0.25Al0.75Ox, Mn1Al1Ox, and 8 wt% Mn-8wt% Fe/γ-Al2O3 catalysts at 150 °C in the presence of 100 ppm SO2. Reaction condition: 0.15 g catalyst, total flow rate =200 ml/min, [NH3]= [NOx]= 500 ppm, [O2]= 5%, [SO2]= 50 or 100 ppm (when used), Ar = balance, GHSV=60000 h-1 [7] Bildquelle Re magnis denda abo. Namenim agnatqu id
6 a) The influence of SO2 concentration (0, 50, and 100 ppm) on the NOx conversion of Mn1Fe0.25Al0.75Ox, Mn1Al1Ox, and 8 wt% Mn-8wt% Fe/γ-Al2O3 catalysts at 150 °C in 1h; b) The long-term isothermal NOx conversion of Mn1Fe0.25Al0.75Ox, Mn1Al1Ox, and 8 wt% Mn-8wt% Fe/γ-Al2O3 catalysts at 150 °C in the presence of 100 ppm SO2. Reaction condition: 0.15 g catalyst, total flow rate =200 ml/min, [NH3]= [NOx]= 500 ppm, [O2]= 5%, [SO2]= 50 or 100 ppm (when used), Ar = balance, GHSV=60000 h-1 [7]
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7 Schematic illustration of the synthesis process for the Ce-Cu-BTC catalyst [10] Bildquelle Re magnis denda abo. Namenim agnatqu id
7 Schematic illustration of the synthesis process for the Ce-Cu-BTC catalyst [10]
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8 Schematic illustration of charge transfer in the Bi/Bi2O2−xCO3 system and the possible mechanism of photocatalysis [14] Bildquelle Re magnis denda abo. Namenim agnatqu id
8 Schematic illustration of charge transfer in the Bi/Bi2O2−xCO3 system and the possible mechanism of photocatalysis [14]
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9 Possible mechanism for photocatalytic reduction of NO2 and CO2 by Mo-doped TNTs [18] Bildquelle Re magnis denda abo. Namenim agnatqu id
9 Possible mechanism for photocatalytic reduction of NO2 and CO2 by Mo-doped TNTs [18]
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10 a) NO2 absorption performance under different systems; b) Effect of SO32- concentration on the NO2 removal performance; c) Effect of SO2 concentration on the NO2 removal performance; d) SO32- accumulation characteristics [21] Bildquelle Re magnis denda abo. Namenim agnatqu id
10 a) NO2 absorption performance under different systems; b) Effect of SO32- concentration on the NO2 removal performance; c) Effect of SO2 concentration on the NO2 removal performance; d) SO32- accumulation characteristics [21]
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11 The arrangement forms of simultaneous removal system: (A) Fixed bed reactor and (B) Cyclitic injection [25] Bildquelle Re magnis denda abo. Namenim agnatqu id
11 The arrangement forms of simultaneous removal system: (A) Fixed bed reactor and (B) Cyclitic injection [25]
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12 Profile of NO removal efficiency and elimination capacity after start-up of RDB [33] Bildquelle Re magnis denda abo. Namenim agnatqu id
12 Profile of NO removal efficiency and elimination capacity after start-up of RDB [33]
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13 Removal mechanism/pathways of NO using microwave-induced H2O2/PS removal system Bildquelle Re magnis denda abo. Namenim agnatqu id
13 Removal mechanism/pathways of NO using microwave-induced H2O2/PS removal system
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The paper reviews several denitration technologies, such as adsorption, reduction, photocatalytic, oxidation-absorption and biological denitration, etc. In order to improve denitration efficiency, it can also be coupled with UV, microwave and electrochemical technology. The denitration mechanisms are introduced and combined with the latest research progress of the report to make a specific description, a brief evaluation and comparison. Finally, the flue gas denitration technology is summarized and prospects presented, in order to provide reference for the progress of new denitration technology and the early industrial application.

1 Introduction

With the development of the economy and the progress of technology, energy consumption is growing fast. Along with the increasing of energy consumption, atmospheric pollutants are increasing. Nitrogen oxide, including NO, NO2 and N2O3 etc., is one of the main atmospheric pollutants, which causes harm to the ecological environment and human health, and also can form acid rain and photochemical smog. In China, with the gradual implementation of the ultra-low emission requirement, the state has set limits on the emission concentration and total emissions of nitrogen oxides.

China has...

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ZKG 5/2022

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ZKG 5/2022

Ressort:  Process
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TEXT Lin Zhao, Wei Zhou, Xuyue Liu, Weiqiang Gao, Qiao Liu,
Tianjin Cement Industry Design and Research Institute Co.‚ Ltd.‚ Tianjin/China

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