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Peng Y.,Tsinghua University | Li J.,Tsinghua University | Huang X.,Tsinghua University | Li X.,Tsinghua University | And 4 more authors.
Environmental Science and Technology | Year: 2014

A series of V2O5/CeO2 catalysts with different potassium loadings were prepared to investigate alkali deactivations for selective catalytic reduction of NOx with NH3. An alkali poisoning mechanism could be attributed to surface acidity, reducibility, and NOx adsorption/desorption behaviors. The detailed factors are as follows: (1) decrease of surface acidity suppresses NH3 adsorption by strong bonding of alkali to vanadia (major factor); (2) low reducibility prohibits NH3 activation and NO oxidation by formation bonding of alkali to vanadia and ceria (important factor); (3) active NOx - species at low temperature diminish because of coverage of alkali on the surfaces (minor factor); and (4) stable, inactive nitrate species at high temperature increase by generating new basic sites (important factor). © 2014 American Chemical Society. Source


Guo T.-T.,Beijing Guodian Longyuan Environmental Engineering Co. | Wu D.-W.,Datang Shandong Renewable Power Co. | Wang C.-Y.,Datang Shandong Renewable Power Co. | Li S.-H.,Northeast Dianli University
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2010

Four different sizes of pre-bend designs were performed for a 1.2 MW wind turbo-generator blade. While numerical simulation was made for its flow field using SST κ-ω turbulence models, during which the influence of pre-bending size on wind turbo-generator power output was obtained, and thus an appropriate pre-bending size was determined. Results show that the wind turbo-generator power output reduces nonlinearly with growing pre-bending size, and the pre-bending profile can effectively regulate the wind turbo-generator power output when wind speed changes. For a pre-bending size of 0.6 m, the design power of 1.2 MW can be reached with only a relative error of 0.0006%. However, the interaction induced by blade rotation is inevitable. Source


Guo T.,Beijing Guodian Longyuan Environmental Engineering Co. | Wu D.,Northeast Dianli University | Zhang Q.,Northeast Dianli University | Li S.,Northeast Dianli University
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2011

In this paper, blades of a 1.2MW wind turbine were designed based on MATLAB programming by using the preflex method. Four blades were respectively designed by un-bended, and with the preflex sizes being 0.3, 0.6 and 0.9 meters, and the SST k-ω turbulence model was adopted to simulate them. The optimum preflex size of the blade was selected after comparing the effects of the preflex sizes on the output power. The results shown that: the output power of un-bended turbine is larger than design power and the relative error is 2.48%, the 0.9 meter's output is less than design power with the relative error of 3.9%, and the 0.6 meter's output approaches the design power with the relative error of 0.0006%. The output power of the wind turbine decreases following with the increase of the preflex sizes, and the characteristics is not linear. Source


Ruan M.,Dalian University of Technology | Guan J.,Dalian University of Technology | He D.,Dalian University of Technology | Meng T.,Beijing Guodian Longyuan Environmental Engineering Co. | Zhang Q.,Dalian University of Technology
RSC Advances | Year: 2015

Ni2P/CNTs was synthesized using an impregnation method. XPS revealed that CNTs could affect the electronic properties of bulk Ni2P. The catalyst shows superior activity for HYD of naphthalene with a conversion of 99%, and demonstrates superior tolerance towards potential catalyst poisons, which is higher than Ni/CNTs with a conversion of 89%. © The Royal Society of Chemistry 2015. Source


Shi X.,CAS Research Center for Eco Environmental Sciences | Ding S.,CAS Research Center for Eco Environmental Sciences | He H.,CAS Research Center for Eco Environmental Sciences | Liu H.,Beijing Guodian Longyuan Environmental Engineering Co. | Lu G.,Beijing Guodian Longyuan Environmental Engineering Co.
Chinese Journal of Environmental Engineering | Year: 2014

Vanadium-titanic-based catalysts were prepared from the anatase TiO2 and the anatase-tungsten powder containing 5% WO3. The effects of alkali and alkaline earth metals (K, Na and Ca) on the performance of vanadium-titanic-based catalysts in the selective catalytic reduction of NOx by ammonia (NH3-SCR) were studied. The degree of the poisoning effect for the alkali metals was shown as K > Na > Ca. The increase of vanadium loading in the catalyst can improve both the SCR activity and alkali resistance. However, high vanadium loading (4.5%V2O5) in the catalyst results in significantly decrease of N2 selectivity and increase in N2O production. The increase of tungsten loading can improve the low temperature activity and alkali resistance with little effect on N2 selectivity. Source

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