Publications
82 results found
Xiao R, Zhang S, Zheng WG, et al., 2011, Chemical-looping combustion with iron-based oxygen carries, Ranshao Kexue Yu Jishu/Journal of Combustion Science and Technology, Vol: 17, Pages: 97-102, ISSN: 1006-8740
Experimental study was carried out for chemical-looping combustion of simulated gas with iron-based oxygen carriers in a fluidized bed. Experimental results show that high CO2 concentration can be obtained at initial reactions. The conversion of CO decreases first and increases thereafter with reduction/oxidization cyclic numbers, while the H2 conversion remains 100% during the whole process of experiments. The yield of CO2 gradually increases and finally remains constant with cyclic numbers. The reactivity of oxygen carriers is high during reduction/oxidization cyclic reactions. With the increase of cyclic numbers, their reactivity increased and finally reaches maximum. The oxidization process is very important for the performance of oxygen carriers, and is thus essential for oxygen carriers to keep high reactivity.
Mueller CR, Bohn CD, Song Q, et al., 2011, The production of separate streams of pure hydrogen and carbon dioxide from coal via an iron-oxide redox cycle, CHEMICAL ENGINEERING JOURNAL, Vol: 166, Pages: 1052-1060, ISSN: 1385-8947
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- Citations: 32
Xiao R, Zhang S, Zheng W, et al., 2010, Pressurized chemical-looping combustion of coal: cyclic performance and characterization of iron ore oxygen carrier, Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition), Vol: 40, Pages: 985-991, ISSN: 1001-0505
Pressurized chemical-looping combustion combined cycle (PCLC) system is proposed for processing coal with high system efficiency and low CO2 sequestration cost. In this work, PCLC of coal was carried out in a laboratory scale fluidized bed reactor to study the cyclic performance of CVRD iron ore oxygen carries with Xuzhou bituminous coal. Experiment results show that more pyrolysis gas is oxidized by the oxygen carrier with the redox cycles going on. The carbon conversion maintains approximately the same with the cycle numbers increasing. The oxygen carrier and carbon conversions increase with the reaction pressure increasing. X-ray diffraction (XRD) analysis indicates that the extent of reduction level increases with the cycle numbers and pressures. No detectable formation of compound of iron oxide and coal ash is observed. Scanning electron microscope analyses (SEM) show that the oxygen carries become porous. Agglomeration of particles is not observed in all experiments. The experimental results indicate that the iron-based oxygen carrier can be used in PCLC applications.
Xiao R, Song Q, Song M, et al., 2010, Pressurized chemical-looping combustion of coal with an iron ore-based oxygen carrier, COMBUSTION AND FLAME, Vol: 157, Pages: 1140-1153, ISSN: 0010-2180
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- Citations: 127
Xiao R, Song Q, Zhang S, et al., 2010, Pressurized Chemical-Looping Combustion of Chinese Bituminous Coal: Cyclic Performance and Characterization of Iron Ore-Based Oxygen Carrier, ENERGY & FUELS, Vol: 24, Pages: 1449-1463, ISSN: 0887-0624
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- Citations: 65
Yang YC, Xiao R, Song QL, et al., 2010, Pressurized chemical-looping combustion of coal using iron ore as an oxygen carrier, Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering, Vol: 30, Pages: 56-62, ISSN: 1674-7607
Experiments on chemical-looping combustion (CLC) of coal using iron ore as an oxygen carrier were carried out in a laboratory fixed bed reactor at 970°C and 0. 1-0. 6 MPa to study the influence of pressure on CLC characteristics under water vapor atmosphere. Results show that high pressure can speed up the coal gasification, enhance water-gas shift reaction, change the syngas composition, reduce CO concentration and raise the concentration of CO2 and H2. At higher pressures, no H2, less CO and less CH4 are to be found in the reduction flue gas, indicating that pressure rise may help to achieve higher conversion rate of syngas. With the rise of pressure, carbon conversion rate grows first and drops later on, during which a maximum carbon conversion rate exists.
Zhang HY, Xiao R, Xiao G, et al., 2009, Experimental research on corncob fast pyrolysis for bio-oil in a fluidized bed reactor, Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics, Vol: 30, Pages: 1779-1782, ISSN: 0253-231X
Corncob fast pyrolysis experiments for bio-oils are carried out in a fluidized bed reactor. The effects of temperature, gas flow rate, static bed height and particle size on pyrolysis product yields are studied and the optimal conditions for bio-oil yield are obtained. Catalytic fast pyrolysis experiments with FCC catalyst are conducted in the optimal conditions. The effects of the catalyst on pyrolysis product yields and the qualities of the liquid products are investigated. The results show that the bio-oil yield of 56.8% is obtained in the optimal pyrolysis conditions. The presence of the catalyst decreases the yields of char and the oil fraction of bio-oil and increased the yields of non-condensable gas, water and coke when compared with the non-catalytic tests. The application of the multi-stage condensation realized a good separation of the heavy oil, light oil and water. The oxygen content and higher heating value of the oil fraction of the bio-oil in the second condenser are 13.64% and 36.7 MJ/kg. It is indicated that the oil fraction had high qualities and promising application prospects.
Ouyang J, Kong F, Su G, et al., 2009, Catalytic Conversion of Bio-ethanol to Ethylene over La-Modified HZSM-5 Catalysts in a Bioreactor, CATALYSIS LETTERS, Vol: 132, Pages: 64-74, ISSN: 1011-372X
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- Citations: 66
Deng ZY, Xiao R, Jin BS, et al., 2009, Numerical simulation of coal gasification in pressurized spout-fluid bed, Ranshao Kexue Yu Jishu/Journal of Combustion Science and Technology, Vol: 15, Pages: 332-338, ISSN: 1006-8740
A 3D unsteady mathematical model has been developed to simulate the coal gasification process in a pressurized spout-fluid bed. This CFD model is composed of gas-solid hydrodynamics, coal pyrolysis, char gasification and gas phase reaction sub-models. The rates of heterogeneous reactions are determined by Arrhenius rate and diffusion rate combined. The homogeneous reactions of gas phase can be treated as secondary reactions. A comparison of the calculation and experimental data shows that most gasification performance parameters can be predicted accurately. The highest temperature occurs at the central jet near the outlet of nozzle, and temperature decreases along the gasifier. High pressure increases coal gasification performance. The good agreement of the calculation and experimental data indicates that CFD modeling can be used to predict the coal gasification process in a complex fluided bed.
Deng Z, Xiao R, Jin B, et al., 2009, Numerical simulation of chemical looping combustion process with CaSO<sub>4</sub> oxygen carrier, INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL, Vol: 3, Pages: 368-375, ISSN: 1750-5836
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- Citations: 69
Shen L, Wu J, Xiao J, et al., 2009, Chemical-Looping Combustion of Biomass in a 10 kW<sub>th</sub> Reactor with Iron Oxide As an Oxygen Carrier, ENERGY & FUELS, Vol: 23, Pages: 2498-2505, ISSN: 0887-0624
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- Citations: 216
Song Q, Xiao R, Deng Z, et al., 2009, Reactivity of a CaSO<sub>4</sub>-oxygen carrier in chemical-looping combustion of methane in a fixed bed reactor, KOREAN JOURNAL OF CHEMICAL ENGINEERING, Vol: 26, Pages: 592-602, ISSN: 0256-1115
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- Citations: 37
Xiao R, Song QL, Zheng WG, et al., 2009, Reduction kinetics of a CaSO<inf>4</inf> based oxygen carrier for chemical-looping combustion, Pages: 519-526
The CaSO4 based oxygen carrier has been proposed as an alternative low cost oxygen carrier for Chemical-looping combustion (CLC) of coal. The reduction of CaSO4 to CaS is an important step for the cyclic process of reduction/oxidation in CLC of coal with CaSO4 based oxygen carrier. Thermodynamic analysis of CaSO4 oxygen carrier with CO based on the principle of Gibbs free energy minimization show that the essentially high purity of CO2 can be obtained, while the solid product is CaS instead of CaO. The intrinsic reduction kinetics of a CaSO 4 based oxygen carrier with CO was investigated in a differential fixed bed reactor. The effects of gas partial pressure (20%-70%) and temperature (880-950 °C) on the reduction were investigated. The reduction was described with shrinking unreacted core model. Experimental results of CO partial pressure on the solid conversion show that the reduction of fresh oxygen carriers is of first order with respect to the CO partial pressure. Both chemical reaction control and product layer diffusion control determine the reduction rate. The dependences of reaction rate constant and effective diffusivity with temperature were both obtained. The kinetic equation well predicted the experimental data.
Zhang H, Xiao R, Pan Q, et al., 2009, Hydrodynamics of a Novel Biomass Autothermal Fast Pyrolysis Reactor: Flow Pattern and Pressure Drop, CHEMICAL ENGINEERING & TECHNOLOGY, Vol: 32, Pages: 27-37, ISSN: 0930-7516
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- Citations: 15
Jin B, Xiao R, Deng Z, et al., 2009, Computational Fluid Dynamics Modeling of Chemical Looping Combustion Process with Calcium Sulphate Oxygen Carrier, INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING, Vol: 7, ISSN: 2194-5748
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- Citations: 12
Gao Z, Shen L, Xiao J, et al., 2008, Use of Coal as Fuel for Chemical-Looping Combustion with Ni-Based Oxygen Carrier, INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, Vol: 47, Pages: 9279-9287, ISSN: 0888-5885
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- Citations: 40
Deng Z, Xiao R, Jin B, et al., 2008, Multiphase CFD Modeling for a Chemical Looping Combustion Process (Fuel Reactor), CHEMICAL ENGINEERING & TECHNOLOGY, Vol: 31, Pages: 1754-1766, ISSN: 0930-7516
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- Citations: 54
Song Q, Xiao R, Deng Z, et al., 2008, Effect of Temperature on Reduction of CaSO<sub>4</sub> Oxygen Carrier in Chemical-Looping Combustion of Simulated Coal Gas in a Fluidized Bed Reactor, INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, Vol: 47, Pages: 8148-8159, ISSN: 0888-5885
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- Citations: 78
Song Q, Xiao R, Deng Z, et al., 2008, Chemical-looping combustion of methane with CaSO<sub>4</sub> oxygen carrier in a fixed bed reactor, ENERGY CONVERSION AND MANAGEMENT, Vol: 49, Pages: 3178-3187, ISSN: 0196-8904
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- Citations: 94
Song Q, Xiao R, Deng Z, et al., 2008, Multicycle Study on Chemical-Looping Combustion of Simulated Coal Gas with a CaSO<sub>4</sub> Oxygen Carrier in a Fluidized Bed Reactor, ENERGY & FUELS, Vol: 22, Pages: 3661-3672, ISSN: 0887-0624
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- Citations: 74
Song Q, Xiao R, Li Y, et al., 2008, Catalytic carbon dioxide reforming of methane to synthesis gas over activated carbon catalyst, INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, Vol: 47, Pages: 4349-4357, ISSN: 0888-5885
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- Citations: 44
Deng Z, Xiao R, Jin B, et al., 2008, Computational fluid dynamics modeling of coal gasification in a pressurized spout-fluid bed, ENERGY & FUELS, Vol: 22, Pages: 1560-1569, ISSN: 0887-0624
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- Citations: 56
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