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| Articles
by
Kefa Cen |
Total Records (
2 ) for
Kefa Cen |
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Xiujuan Guo
,
Shurong Wang
,
Zuogang Guo
,
Qian Liu
,
Zhongyang Luo
and
Kefa Cen
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Molecular distillation was used to separate bio-oil into a light fraction, a middle
fraction and a heavy fraction. The chemical composition of the three fractions
and the crude bio-oil was analyzed by gas chromatography coupled with mass spectrometry
(GC-MS). The diversity of the components reflected the complexity of the
bio-oil and the necessity for fractionation. The pyrolysis characteristics of
the bio-oil fractions were determined with a thermogravimetric analyzer coupled
with Fourier transform infrared spectroscopy (TG-FTIR). The weight loss
of components was in agreement with the chemical composition. The light fraction
evaporated fastest with the formation of water, CO2, hydrocarbons and
alcohols. The heavy fraction had the slowest rate of decomposition and the highest
char residue yield due to the presence of phenols and saccharides, and the pyrolysis
products included CO2 and alcohols or phenols, which was similar to
the middle fraction except the formation of water and formic acid. The release
of CO or methane, evidence of a secondary reaction, began at  450 °C
in the pyrolysis of the light and middle fractions. |
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Xiang Gao
,
Honglei Din
,
Zhen Du
,
Zuliang Wu
,
Mengxiang Fang
,
Zhongyang Luo
and
Kefa Cen
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In order to investigate the characteristics of the reaction between ammonium sulfite, the main desulfurizing solution, and the flue-gas-contained sulfur dioxide during the process of ammonia-based WFGD (wet flue gas desulfurization) in a power plant, the gas-liquid absorption reaction between sulfur dioxide and an ammonium sulfite solution was studied in a stirred tank reactor. The experimental results indicate that the absorption of sulfur dioxide is controlled by both the gas- and liquid-films when the ammonium sulfite concentration is lower than 0.05 mol/L, and mainly by the gas-film at higher concentrations. In the latter case, the reaction rates are found to be zero-order with respect to the concentration of ammonium sulfite. The absorption rates of sulfur dioxide increase as the concentration of sulfur dioxide in inlet gas and the temperature increase. The reaction rate is of 0.6th-order with respect to the concentration of sulfur dioxide. |
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