Analysis of operational parameters affecting denitrification rate of sintering flue gas in cross-flow activated coke pur
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ORIGINAL PAPER
Analysis of operational parameters affecting denitrification rate of sintering flue gas in cross-flow activated coke purification facility Wei-li Zhang1 • Sheng-li Wu1 • Zhong-jie Hu1,2 Received: 9 July 2019 / Revised: 22 December 2019 / Accepted: 22 December 2019 Ó China Iron and Steel Research Institute Group 2020
Abstract The denitrification rate of the cross-flow activated coke flue gas purification facility varies with operational parameters. According to the simulated experiments, the denitrification rate with the height drop of the denitrification unit experiences 100%, rapid decreasing, and gradual rising to the equilibrium. According to the correlation analysis results based on production data, several operational parameters affecting the denitrification rate have been obtained. The denitrification rate has negative relationships with the activated coke bed temperature, the flue gas flow, the H2O content, the SO2 content and the NH3 slip, and has positive relationships with the O2 content, the NOx content, the NH3–NOx molar ratio, the flue gas pressure and the regeneration temperature. Properly increasing the sintering air leakage or the cooling air added into flue gas is beneficial to increase the denitrification rate. Priority should be given to O2, NH3–NOx molar ratio and flue gas flow to improve the denitrification rate. Additionally, a linear model, which had been validated, was developed and can be used to predict and control the denitrification rate. Keywords Denitrification Activated coke Operational parameter Sintering flue gas Statistical analysis
1 Introduction As the culprit of photochemical smog, NOx has been the focus of countries all over the world [1]. The sintering process of Chinese steel industry produces up to 206 million kilogram of NOx per year. Simultaneously, the sintering flue gas has the characteristics of large volume and low pollutant content, which is not conducive to the treatment of pollutants. The activated coke (AC) flue gas treatment technology has been widely used for comprehensive treatment of NOx, SO2, dioxins, dust and heavy metals in sintering flue gas. It has been revealed that NOx can be effectively remssssoved by reacting with NH3 injected into flue gas to generate N2 and H2O in the presence of O2 under the catalysis of AC [2–6]. However, the
& Sheng-li Wu [email protected] 1
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
Baoshan Iron and Steel Co., Ltd., Shanghai 201999, China
denitrification rate (RDeNOx ) varies greatly with operational parameters in the actual plant. Numerous studies about the influence of operational parameters on RDeNOx have been done [5, 7–11]. Most of these studies were carried out under laboratory simulated test conditions to explore the effects of single operational parameter on RDeNOx . Nevertheless, laboratory simulation experiments are difficult to absolutely simulate the denitri
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