Effects of system parameters and residual ions on the oxidation removal of NO by Fenton method
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RESEARCH ARTICLE
Effects of system parameters and residual ions on the oxidation removal of NO by Fenton method Peng Yuan 1,2,3 & Xue Mei 1 & Boxiong Shen 1,3 & Zhiyong Ji 2 & Hongpei Gao 4 & Yan Yao 5 & Cai Liang 6 & Hongjie Xu 7 Received: 27 March 2020 / Accepted: 17 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In the present work, the effects of relevant system parameters on the oxidation removal of NO using the Fenton method were discussed in detail. Moreover, the impacts of ions remaining in the coal-fired process on the NO oxidation efficiency were investigated specifically. The experimental results showed that the oxidation efficiency of NO decreased with the increase of gas flow rate, reagent temperature, and CO2 volume fraction in the evaluated range, while it increased first and then decreased with the increase of gas temperature, NO initial concentration, O2 volume fraction, initial pH of reagent, and Fe2+/H2O2 molar ratio. In addition, the corresponding impact mechanism of the system parameters was discussed respectively. Although the SO2 showed a competitive effect on the utilization of oxidative radicals, the Fenton system also showed an ability for simultaneous removal of NO and SO2. Furthermore, the results indicated that the NO oxidation efficiency would be influenced by the residual ions, such as Ca2+, Mg2+, Na+, SO42−, and Cl−. The presence of the mentioned ions showed an inhibiting effect on the oxidation removal of NO in the first few minutes, while the NO oxidation efficiency would be enhanced in the bulk stage of the tests. The positive effect trended to be more obvious with the decline of the ion dosage. Subsequently, the influence mechanism of the aforesaid residual cations and anions was supposed and proposed preliminarily. Keywords Fenton . Oxidation . Flue gas . NO . Cation . Anion
Introduction Because of its broad availability and relatively low mining costs, coal is used to produce the basic amount of electrical and heat energy in several countries worldwide. However, the utilization of coal has also been connected to several environmental problems (Srivastava et al. 2005). The release of NOx and SO2 would cause damage to air, water and soil, animals, plants, and even people (Becker et al. 2014; Bilgili et al. 2015;
Qu et al. 2016; Zarnitz and Pisupati 2007; Zhang et al. 2017), also there is a risk of climate change (Cook et al. 2016). In addition, as a complex fossil fuel, coal contains various elements apart from N and S, such as alkali metals (Na, Ca, and Mg) and chlorine (Cl) compounds (Liu et al. 2018; Nennstiel et al. 2014). During the thermal utilization of high-alkali or low-grade coals, part of the alkali metals would sublime and release into the flue gas (Bläsing and Müller 2013). Besides, several researchers reported that temperature
Responsible editor: Vítor Pais Vilar * Boxiong Shen [email protected] * Zhiyong Ji [email protected] 1
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Tianjin Key Laboratory of Clean Energy Utilization and Pollutants Control, Hebei Univers
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