Effects of Chemical Forms of Alkali and Alkaline Earth Metallic Species on the Char Ignition Temperature of a Loy Yang Coal under O2/N2 Atmosphere
| Autor: | Minghou Xu, Wang Chao, Jingying Xu, Le Wu, Ben Gui, Yu Qiao, Hong Yao |
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| Rok vydání: | 2011 |
| Předmět: |
Alkaline earth metal
business.industry General Chemical Engineering Inorganic chemistry technology industry and agriculture Energy Engineering and Power Technology Sulfuric acid Autoignition temperature respiratory system Combustion Alkali metal complex mixtures respiratory tract diseases law.invention Ignition system chemistry.chemical_compound Fuel Technology chemistry law otorhinolaryngologic diseases Coal Char business |
| Zdroj: | Energy & Fuels. 26:112-117 |
| ISSN: | 1520-5029 0887-0624 |
| Popis: | Experiments were performed to determine the effects of alkali and alkaline earth metallic (AAEM) species on the ignition behavior of char under O2/N2 conditions. The char ignition temperatures of a Loy Yang brown coal were investigated using a wire-mesh reactor, where the secondary reactions of the evolved volatiles were minimized. Water, ammonium acetate, and sulfuric acid sequential extractions were employed to prepare the coal samples of different chemical forms of AAEM compounds from raw coal. In comparison to that of raw coal, the increases in the average char ignition temperature of 33 and 55 °C were observed for ammonium-acetate-extracted coal and sulfuric-acid-extracted coal (H-form coal), respectively, indicating the strong catalytic effects of various chemical forms of AAEM species on the char ignition behavior of brown coal. To find out which chemical form of sodium has a higher catalytic effect on the char ignition behavior, combustion experiments were also carried out for Na-exchanged coals a... |
| Databáze: | OpenAIRE |
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