Impacts of the gas atmosphere on the gasification reactivity and char structure of the brown coal
MetadataShow full item record
Shengli brown coal was gasified at 800-900? in a simulated entrained-flow reactor to investigate the effects of steam, oxygen and their mixture atmospheres on the gasification characteristics. The impact mechanism of gasifying agents on the char structures and reactivity were systematically clarified using Fourier Transform Infrared Spectroscopy (FTIR) and thermogravimetric analyzer(TGA). The results indicate that the addition of oxygen to the gasifying agent (i.e. steam) is considered to able to optimize the gasification reaction and increase the H 2 yield, the largest increase valve of H 2 being 13% in this study. The -OH, -CH 3 and -CH 2 - functional groups drastically decrease during gasification. As a result, the regular structure of char and the aromatic degree increase. The reactivity of char from gasification in different atmospheres was evaluated by TGA, which shows the reactivity of char decrease with the increasing of the concentration of steam, and further addition of O 2 restrain the reactivity index of char, whose minimum value obtained is 0.005 min -1 . Under the oxygen atmosphere, the lower oxygen concentration demonstrates less influence on the reactivity of char.
Showing items related by title, author, creator and subject.
Xu, X.; Wang, Y.; Chen, Z.; Bai, L.; Zhang, K.; Yang, S.; Zhang, Shu (2015)©, 2015, Science Press. All right reserved. This paper was to examine the changes in structure and reactivity of chars upon to varied cooling approaches for “hot” char derived from Shengli brown coal. The “hot” chars ...
An X-ray photoelectron spectroscopic perspective for the evolution of O-containing structures in char during gasificationWang, Shuai; Wu, L.; Hu, X.; Zhang, Lei; O'Donnell, Kane; Buckley, Craig; Li, Chun-Zhu (2018)The purpose of this study is to investigate the evolution of O-containing structures of char during gasification. Mallee wood (4.75–5.60 mm) from Western Australia was gasified in a fluidised-bed reactor at 600–900 °C in ...
Effects of gasification temperature and atmosphere on char structural evolution and AAEM retention during the gasification of Loy Yang brown coalLi, T.; Zhang, L.; Dong, Li; Zhang, S.; Qiu, P.; Wang, S.; Li, Chun-Zhu (2017)© 2017 Elsevier B.V.This study aims to investigate the influence of gasification temperature on the evolution of char structure and the retention of alkali and alkaline earth metallic (AAEM) species for a Victorian brown ...