Search

Your search keyword '"Piao, Guilin"' showing total 46 results
Start Over Author "Piao, Guilin"
46 results on '"Piao, Guilin"'

25. A new pulverized biomass utilization technology

Author

Shigekatsu Mori, Nobusuke Kobayashi, Shigenobu Hatano, Jun Kobayashi, Piao Guilin, and Yoshinori Itaya

Subjects
chemistry.chemical_compound, Prima materia, Waste management, chemistry, General Chemical Engineering, Biomass, Liquefaction, Tar, Environmental science, Cellulose, Raw material
Abstract

Pulverized wood biomass utilization technologies, such as gasification and liquefaction, were discussed. Firstly, pulverization technique of wood biomass by a vibration mill was introduced, and pulverized wood biomass characteristics were evaluated. The wood powder pulverized by the vibration mill had a round shape, and the wood fibers were completely broken. Therefore, the diameter of wood powder was fine and the crystallinity of cellulose was very low. By using this pulverized wood biomass, high temperature gasification experiment and liquefaction experiment were conducted. Gasification experiment was conducted in an entrained down flow gasifire. Since fine wood powder had a high reactivity, the gasification experiment showed the high gasification performance without a tar generation. Liquefaction experiment of wood biomass was conducted in a hot compressed water to produce saccharine. Pulverized wood biomass was also used as a raw material in the liquefaction experiment. By using very fine wood powder, productivity of saccharine increased dramatically.

Published
2008

46. Dehydroxylation and Structural Distortion of Kaolinite as a High-Temperature Sorbent in the Furnace.

Author

Cheng, Yun, Xing, Jingru, Bu, Changsheng, Zhang, Jubing, Piao, Guilin, Huang, Yaji, Xie, Hao, and Wang, Xinye

Subjects
KAOLINITE, COAL combustion, FOURIER transform spectrometers, NUCLEAR magnetic resonance, HYDROXYL group, ARRHENIUS equation, FURNACE atomic absorption spectroscopy
Abstract

As a high-temperature sorbent, kaolinite undergoes the flash calcination process in the furnace resulting in the dehydroxylation and structural distortion, which are closely related to its heavy metal/alkali metal adsorption characteristics. We investigated the flash calcination of kaolinite by the experiments using a drop tube furnace and by the characterization of flash-calcined products using thermogravimetric-differential scanning calorimeter (TG-DSC), X-ray diffraction (XRD), Fourier Transform Infrared Spectrometer (FTIR)and nuclear magnetic resonance (NMR). There were three kinds of hydroxyl groups in kaolinite during flash calcination at 800–1300 °C, E-type (~50%, easy), D-type (~40%, difficult) and U-type (~10%, unable) according to the removal difficulty. The hydroxyl groups activation was believed to be the first step of the removal of E-type and D-type hydroxyl groups. The kinetics model of dehydroxylation groups at 900–1200 °C was established following Arrhenius equation with the activation energy of 140 kJ/mol and the pre-exponential factor of 1.32 × 106 s−1. At 800 °C, the removal of E-type hydroxyl groups resulted in the conversion of a part of VI-coordinated Al in kaolinite to V-coordinated Al and the production of meta-kaolinite. When the temperature rose up to 1200 °C, mullite was produced and a part of V-coordinated Al converted to IV-coordinated Al and VI-coordinated Al. Finally, the adsorption characteristics of kaolinite was discussed according to the results of dehydroxylation and structural distortion. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results