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Xie Z.,Guangzhou Academy of Energy Testing and Inspection | Ma X.,South China University of Technology
Bioresource Technology | Year: 2013

The thermal characteristics and kinetics of paper sludge, rice straw and their blends were evaluated under combustion condition. The paper sludge was blended with rice straw in the range of 10-95. wt.% to investigate their co-combustion behaviour. There was significant interaction between rice straw and paper sludge in high temperature. The combustion of paper sludge and rice straw could be divided into two stages. The value of the activation energy obtained by the Friedman and the Ozawa-Flynn-Wall (OFW) first decreased and then increased with the conversion degree rising. The average activation energy did not monotonically decrease with increasing the percentage of rice straw in the blends. When the percentage of rice straw in the blends was 80%, the value of the average activation energy was the smallest, which was 139. kJ/mol obtained by OFW and 132. kJ/mol obtained by Friedman, respectively. © 2013 Elsevier Ltd. Source


Xie Z.,South China University of Technology | Xie Z.,Guangzhou Academy of Energy Testing and Inspection | Ma X.,South China University of Technology
Energy and Fuels | Year: 2014

HCl emission characteristics during the combustion of eucalyptus bark were carried out at various temperatures. The influence of the various additives on the HCl emission was investigated by the experiment, FactSage, and X-ray diffraction. The results showed that the HCl emission could be divided into two stages at 500°C. The totality of the HCl emission at 500°C was an order of magnitude higher than that at 600°C. The peak value of the HCl emission curves increased initially and then decreased with the temperature between 500 and 900°C, while the totality of the HCl emission decreased with the temperature. Calcium oxide and aluminum oxide could reduce the HCl emission during the combustion process. However, the removal effect of the HCl emission decreased with increasing the temperature. Unlike calcium oxide and aluminum oxide, the addition of kaolin to the bark could increase the HCl emission. The deviation between the simulation and practical results increased at a low temperature. Moreover, all of the additives could retain potassium in the residue of the eucalyptus bark, but the effect of kaolin to retain potassium was more significant than the effect of the other additives. © 2014 American Chemical Society. Source


Tan F.T.,South China University of Technology | Tan F.T.,Guangzhou Academy of Energy Testing and Inspection | Ma X.Q.,South China University of Technology | Feng C.,South China University of Technology | Feng C.,Guangzhou Academy of Energy Testing and Inspection
Construction and Building Materials | Year: 2011

By thermogravimetric analysis (TGA) and kinetic study, the thermal decomposition and combustion processes of a fire retardant board were investigated under different N2-O2 mixture gas atmospheres, with 20%, 15%, 10% and 5% oxygen, respectively. The samples were heated from 373 K to 1223 K with a constant heating rate of 30 K/min. The trend of the thermogravimetry (TG) curves and derivative thermogravimetry (DTG) curves were interpreted regarding the conversion yields and the reactivity of samples. There are nine reaction stages which are discernible easily from DTG curves for samples under different gas atmospheres. Each sample's top value among maximum mass loss rates of all reaction stages appears during reaction 4 stage. The reaction orders and apparent activation energies of all samples during all reaction stages vary between 1.4 and 4.0 and between 7.358 kJ/mol and 535.555 kJ/mol. © 2010 Elsevier Ltd. All rights reserved. Source

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