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Shi Y.-L.,University of Science and Technology Beijing | Shi Y.-L.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Tong Z.-S.,University of Science and Technology Beijing | Tong Z.-S.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | And 2 more authors.
Kang T'ieh/Iron and Steel | Year: 2015

In order to find active reaction zone of dense flow absorber and the reason that why the distal end of bag-filter was not highly used, it was urgent to study the internal flow field distuibution and the change of pressure field. In this paper, the system of a dense flow absorber integrated bag-filter was simulated with Fluent software before and after improvement. The two-equation turbulence model and discrete phase model(DPM) were used to simulate the gas phase flow and solid phase flow, respectively. Results of the simulation showed that changing the layout of outlets had much more positive effects on the homogeneous flow inside bag-filter than adding the baffle plate inside bag-filter. The empirical study also indicated that the most optimized design of the baffle plate inside the dense flow absorber was 7.5 m in length and 45 degree in angle. © 2015, Chinese Society for Metals. All right reserved. Source


Li Y.,University of Science and Technology Beijing | Yi H.,University of Science and Technology Beijing | Yi H.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Tang X.,University of Science and Technology Beijing | And 5 more authors.
Chemical Engineering Journal | Year: 2016

With Fe3O4 as the carrier, tetrabutyl titanate as precursor, the TiO2 was wrapped on the surface of Fe3O4 by hydrothermal method to synthesize the Fe3O4-TiO2 composite. X-ray powder diffraction (XRD), Transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) analysis showed that the nano TiO2 formed a better coating layer on the surface of Fe3O4 particles. In the experiment, the simulation of the SO2 and NO of the industrial coal-fired flue gas was tested respectively by Fe3O4, TiO2 and x%Fe3O4-TiO2 (x% represents the mass fraction of Fe3O4 of the total material). The results showed that the activities of TiO2 and Fe3O4-TiO2 were good, and both of them had good removal effect on SO2 and NOx. TiO2 was wrapped on Fe3O4, which formed a special package structure, the surface layer of nano TiO2 and Fe3O4 carrier can promote each other, the performance of simultaneous desulfurization and denitrification can be further improved. Fe3O4-TiO2 composites with different ratio were tested at 100 °C; 10%Fe3O4-TiO2 had high reaction performance; the removal effect gradually decreased with the increase of Fe3O4 content. The performance of 10%Fe3O4-TiO2 composite on simultaneous desulfurization and denitrification at 100 °C, 150 °C, 200 °C was in descending order. At the temperature of 100 °C, the removal effect of 10%Fe3O4-TiO2 on SO2 and NOx can be maintained at 100% and 50% respectively, and it was not until after 64 min the NOx was close to penetrate. The addition of H2O enhanced the SO2 adsorption; and the NO adsorption capacity decreased with the increase of the H2O content. NOx and SO2 were adsorbed on the surface of the composite material by physical and chemical adsorption, the products were sulfate and nitrate according to the results of the characterization. © 2016 Elsevier B.V. Source


Dong Y.-B.,University of Science and Technology Beijing | Dong Y.-B.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Lin H.,University of Science and Technology Beijing | Lin H.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | And 2 more authors.
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | Year: 2016

In order to study the ability of lees to adsorb heavy metals, this article was focused on the effects of wastewater pH values, Pb2+ and Zn2+ mass concentrations, and adsorption time on the adsorption quantity of Pb2+ and Zn2+ from simulated acid mine drainage using lees. Test results show that the maximum removal rate appears when the pH value is 4. The adsorption of Pb2+ by lees accords with the Langmuir equation, but the adsorption of Zn2+ is followed by the Freundlich equation. Under the optimal conditions, the maximum adsorption capacity of Pb2+ and Zn2+ by lees is 8.29 mg·g-1 and 15.31 mg·g-1, respectively. The adsorption process reaches equilibrium after 4 h, in agreement with the second-order kinetics model. The contents of cellulose, hemicelluloses and lignine in the lees is 23.3%, 65.5% and 0.5%, while become 19.6%, 42.3% and 2.6% after adsorption of Pb2+ and Zn2+, respectively. The electro-negativity of lees increases while the pH value raises, and it reduces after adsorption of Pb2+ and Zn2+. Fourier transform infrared spectra indicate that the main functional groups are amide and ester reacting in the adsorption process. © All right reserved. Source


Zhang Y.,University of Science and Technology Beijing | Tang X.,University of Science and Technology Beijing | Tang X.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Yi H.,University of Science and Technology Beijing | And 7 more authors.
RSC Advances | Year: 2016

Abatement of NOx through non-thermal plasma (NTP) processes has been developed over the past several years. Since discharge plasma contains a large amount of highly active species during the reaction process, NOx is removed during our desired conversion reaction, as well as production of other byproducts, such as O3 and N2O. The effect of reaction conditions, such as oxygen content, discharge power, operation time, initial NO concentration and gas residence time, on generation characteristics of O3 and N2O was investigated. Results showed that, with increasing oxygen concentration and discharge power, the production of N2O and O3 increases. Additionally, O3 concentration decreases with increasing operation time; the higher input power, the higher the temperature increases, causing a greater reduction rate of O3, which also leads to a reduction of NO2 production. NO concentration and gas residence time also exert effects on the generation of byproducts. © 2016 The Royal Society of Chemistry. Source


Ma H.,University of Science and Technology Beijing | Ma H.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | Yang J.,University of Science and Technology Beijing | Yang J.,Beijing Key Laboratory of Resource oriented Treatment of Industrial Pollutants | And 7 more authors.
Bioresource Technology | Year: 2016

Stillage reflux fermentation in food waste ethanol fermentation could reduce sewage discharge but exert a harmful effect because of side-product accumulation. In this study, regulation methods based on metabolic regulation and side-product alleviation were conducted. Result demonstrated that controlling the proper oxidation-reduction potential value (-150 mV to -250 mV) could reduce the harmful effect, improve ethanol yield by 21%, and reduce fermentation time by 20%. The methods of adding calcium carbonate to adjust the accumulated lactic acid showed that ethanol yield increased by 17.3%, and fermentation time decreased by 20%. The accumulated glyceal also shows that these two methods can reduce the harmful effect. Fermentation time lasted for seven times without effect, and metabolic regulation had a better effect than side-product regulation. © 2016 Elsevier Ltd. Source

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