The dynamic change of pore structure for low-rank coal under refined upgrading pretreatment temperatures
- PDF / 3,119,102 Bytes
- 14 Pages / 595.276 x 790.866 pts Page_size
- 37 Downloads / 169 Views
ORIGINAL ARTICLE
The dynamic change of pore structure for low‑rank coal under refined upgrading pretreatment temperatures Teng Li1,2,3 · Cai‑Fang Wu4 · Zi‑Wei Wang4 Received: 27 August 2020 / Accepted: 13 October 2020 © The Author(s) 2020
Abstract Pore structure characteristics are significant factor in the evaluation of the physical characteristics of low-rank coal. In this study, three low-rank coal samples were collected from the Xishanyao Formation, Santanghu Basin, and low-temperature liquid-nitrogen adsorption (LP-N2A) measurements were taken under various pretreatment temperatures. Owing to the continuous loss of water and volatile matter in low-rank coal, the total pore volume assumes a three-step profile with knee temperatures of 150 °C and 240 °C. However, the ash in the coal can protect the coal skeleton. Pore collapse mainly occurs for mesopores with aperture smaller than 20 nm. Mesopores with apertures smaller than 5 nm exhibit a continuous decrease in pore volume, whereas the pore volume of mesopores with apertures ranging from 5 to 10 nm increases at lower pretreatment temperatures (
Data Loading...
