Details

Autor(en) / Beteiligte

• Yajun LI
• Qiaorong MENG
• Tao CHEN
• Feng LIN

Titel

Permeability and microstructure of pyrolysis lignite

Ist Teil von

• Méitàn xuébào, 2023-04, Vol.48 (4), p.1707-1714

Ort / Verlag

Editorial Office of Journal of China Coal Society

Erscheinungsjahr

2023

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• In order to study the influence of micro pore fissure structure on permeability under the thermal-fluid-solid coupling during lignite pyrolysis, real-time CT scanning of lignite during low-temperature pyrolysis was carried out by using the μCT225kVFCB high-precision micro-CT test system of Taiyuan University of Technology, combined with the self-developed high-temperature atmosphere furnace. The micro-structure of lignite was studied and analyzed with AVIZO software. Through the extraction and analysis of the effective pore and fissure of lignite, the evolution process of the permeability of lignite under non-stress condition with temperature was studied from the perspectives of Kozeny-Carman permeability estimation equation and Darcy’s law. The results show that: ① From room temperature to 600 ℃, the evolution process can be divided into three stages: the first stage, at room temperature to 300 ℃, thermal cracking occurs in the coal body, resulting in the generation of a large number of pores and fissures, a