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Yuqun Zhuo,Yaming Fan,Zhenwu Zhu,Liangliang Li,Qun Chen,Yu Lou 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.10
The preparation of activated carbon sorbent for Hg removal was simplified by combining activation and functionalization processes into one step. Jujube-based carbon material was first mixed with CuCl2 solution and then activated for the preparation of Cu-impregnated activated carbon. Physical and chemical properties of prepared activated carbon were investigated by means of N2 adsorption, SEM-EDS, XRD. A fixed-bed reactor with CEMS (Continuous emission monitoring system) was used to test the Hg adsorption ability of prepared activated carbon. DFT (Density functional theory) method of computational chemistry calculation was applied to identify the Hg adsorption mechanisms on sorbent surface.
Tianjin Li,Yuqun Zhuo,Junyong Lei,Xuchang Xu 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.6
potential of the sorbent-catalysts prepared from three low cost materials, i.e., the lime, fly ash andsome industrial waste material containing iron oxide, have been investigated for simultaneous removal of SO2 and NOxfrom flue gas in the temperature range 700-850oC. NH3 was chosen as the reducing agent for NO reduction in thisstudy. Experimental results showed that SO2 and NO could be simultaneously removed efficiently in the absence ofO2 at the temperature window of 700-800oC. The effect of product layer generated from SO2 removal on NO removal2, which was attributed to the partial oxidationof NH3 to NO over the sorbent-catalysts in the presence of oxygen. Neither NO2 nor N2O by-product was detected bothin the absence and presence of O2. Three routes were suggested to overcome the negative effect of O2.
Mass transfer and kinetics study on the sulfite forced oxidation with manganese ion catalyst
Zhao Bo,Li Yan,Zhuo Yuqun,Tong Huiling,Zhang Xiaowen,Chen Changhe 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.3
limestone scrubbing is the most common flue gas desulfurization process (FGD) for control of sulfurdioxide emissions from the combustion of fossil fuels. Forced oxidation, which controls the overall reaction of the sulfurdioxide absorption, is the key path of the process. Manganese which comes from the coal is one of the catalysts duringthe forced oxidation process. In the present work, the two-film theory was used to analyze the sulfite forced oxidationreaction with an image boundary recognition technique, and the oxidation rate was experimentally studied by contactingpure oxygen with a sodium sulfite solution. There was a critical sulfite concentration 0.328 mol/Lwithout catalyst ortion constant k; furthermore, we obtained the order with respect to the sulfite and Mn2+ concentrations. When the Mn2+catalyst concentration was kept unchanged, the sulfite oxidation reaction rate was controlled by dual film and the reac-tion kinetics was first order with respect to sulfite while concentration was below 0.328 mol/L; the sulfite oxidationreaction rate was controlled by gas film only and the reaction kinetics was zero order with respect to sulfite while concentration over 0.328 mol/L. When concentration was kept unchanged, the sulfite oxidation reaction rate de-pended on gas-liquid mass transfer and the reaction kinetics was diferent in various stages with respect to Mn2+ con-centrations.
Effects of water vapor, CO_2 and SO_2 on the NO reduction by NH_3 over sulfated CaO
Xinfang Yang,Bo Zhao,Yuqun Zhuo,Changhe Chen,Xuchang Xu 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.8
Gas effects on NO reduction by NH_3 over sulfated CaO have been investigated in the presence of O_2 at 700-850℃ . CO_2 and SO_2 have reversible negative effects on the catalytic activity of sulfated CaO. Although H_2O alone has no obvious effect, it can depress the negative effects of CO_2 and SO_2. In the flue gas with CO_2, SO_2 and H_2O coexisting,the sulfated CaO still catalyzed the NO reduction by NH_3. The in situ DRTFTS of H2O adsorption over sulfated CaO indicated that H_2O generated Brønsted acid sites at high temperature, suggesting that CO_2 and SO_2 competed for only the molecularly adsorbed NH_3 over Lewis acid sites with NO, without influencing the ammonia ions adsorbed over Brønsted acid sites. Lewis acid sites shifting to Brønsted acid sites by H_2O adsorption at high temperature may explain the depression of the negative effect on NO reduction by CO_2 and SO_2.
False diffusion in numerical simulation of combustion processes in tangential-fired furnace
Xuchang Xu,Zhigang Wang,Yuqun Zhuo,Changhao Zheng 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.11
Numerical simulation serves as one of the most important tools for analyzing coal combustion in Tangentially Fired Furnaces (TFF) with NUMERICAL FALSE DIFFUSION as one key problem that degrades the simulation accuracy, especially for complex flow patterns. False diffusion often completely compromises the accuracy, leading to erroneous predictions. This paper reviews various methods to reduce the numerical diffusion. In computational fluid dynamics (CFD), false diffusion originates from a truncation error of the Taylor series approximation of the derivative and multidimensional discretization effects. Higher-order upwind convective schemes were designed to reduce truncation errors, while grid line adjusting methods were developed to reduce crossflow diffusion. This paper compares numerical and experimental results for isothermal flows to evaluate these methods. Results with the standard upwind scheme in a rectangular Cartesian mesh are compared with results in body-fitted meshes for comprehensive combustion processes in a TFF. Analysis of the false diffusion effect in the x, y, z directions and the artificial viscosity distribution in a rectangular mesh shows where the false diffusion overtakes the real physical diffusion and where the mesh must be refined or grid line must be adjusted to improve TFF combustion simulations.