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Huang M.,Kunming University of Science and Technology | Li K.,Kunming University of Science and Technology | Zheng M.,Kunming University of Science and Technology | Shen L.,Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015

Combination of CaSO4 and Fe2O3 was used as composite oxygen carriers for chemical looping combustion (CLC) in the present work. Thermodynamic equilibrium analysis on the reactions between oxygen carriers and coal in the presence of stream was investigated. The competing reaction mechanisms of coal with CaSO4 and Fe2O3 as well as the possible reactions between iron oxides, gas sulfides and coal ash were also discussed. The addition of Fe2O3 to CaSO4 benefited the conversion of fuel to CO2 while H2O. Fe2O3 was only reduced to Fe3O4, rather than FeO or Fe. In the reaction temperature range of 850 to 1050 ℃, the reactions of iron oxides with SO2 or H2S to FeS or FeS2 were not observed. It should be noted that CaO, as the by-product of CaSO4 reduction, can react with the SiO2 and Al2O3 in coal ash to form calcium silicate and calcium aluminate, respectively. ©, 2015, Science Press. All right reserved. Source


Hu X.,North China Electrical Power University | Hu X.,Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education | Wu L.,North China Electrical Power University | Ju S.,North China Electrical Power University | And 3 more authors.
Environmental Engineering Science | Year: 2014

Experiments were carried out studying the catalytic behavior of CaO on the thermal decomposition of N2O. CaO was found to catalyze N 2O decomposition and the decomposition ratio was sensitive to reaction temperature. The catalytic mechanism was further explained by Density Functional Theory with generalized gradient approximation method from a microscopic point of view. The electronic properties of CaO (100) surfaces was studied, and the catalytic activity of different active sites on CaO (100) surface was investigated. N2O adsorption and decomposition processes were determined by studying the adsorption and interaction between the N 2O molecule and CaO (100) surface. The O site of the CaO (100) surface was found to be of higher reactivity toward decomposing N2O where an adsorbed O species can be formed by the decomposition of N2O molecule. The adsorbed O species shows high activity in reacting with N 2O molecule and thus facilitates N2O decomposition on the surface. © Copyright 2014, Mary Ann Liebert, Inc. 2014. Source


Hu X.,North China Electrical Power University | Hu X.,Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education | Wu L.,North China Electrical Power University | Dong C.,North China Electrical Power University
Journal of Residuals Science and Technology | Year: 2015

This paper presents a study on a sludge disposing system using exergy analysis approach and energy utilization diagram methodology. The results showed that, among the main equipment of the system, the furnace has the largest irreversibility (about 49.46% of the total exergy input) and the heat recovery steam generator (or HRSG) has the lowest exergy efficiency (about 23.80%). Suggestions are accordingly provided on heat transfer enhancement and thorough mixing of fuels. © 2015 DEStech Publications, Inc. Source


Cao J.,Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education | Zhong W.,Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education | Jin B.,Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education | Wang Z.,Nanjing Southeast University | Wang K.,Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education
Energy and Fuels | Year: 2014

A calcium-magnesium-aluminum (Ca-Mg-Al) mixed oxide sorbent was synthesized for the removal of HCl at medium-high temperatures. The operating conditions were specified in terms of the temperature of the gas (300-700 °C), the initial HCl concentration (500-1000 ppm), and the mass flow rate (0.5-1.3 L/min). X-ray powder diffraction (XRD) was applied to investigate the characteristics of Ca-Mg-Al mixed oxides. The results show that, because of the better properties of Ca-Mg-Al mixed oxides than traditional sorbents, which is related to the special structure in as-prepared, the reaction between HCl and Ca-Mg-Al mixed oxides is accelerated. The adsorption capacity of Ca-Mg-Al mixed oxides is the highest when compared to MgO, NaHCO3, and CaO. The removal efficiency of Ca-Mg-Al mixed oxides is more than 95% and even up to 99% under all of the operating conditions. © 2014 American Chemical Society. Source

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