CCTEG Shenyang Research Institute

Study on the evolution laws of coal spontaneous combustion products and reaction pathways under different oxygen concentrations based on ReaxFF simulation

Understanding the oxygen-dependent reaction behavior of residual coal is important for evaluating its renewed oxidation after oxygen re-entry into sealed fire zones. In this study, temperature-programmed oxidation experiments coupled with gas chromatographic and FTIR analyses wer...

Typical Pore Characteristics of Nontectonic and Tectonic Low-Rank Lignite in Mining Areas and Their Influence on Gas Desorption

Abstract Pore characteristics determine the control mechanism of gas adsorption and desorption in the coal bodies. The fundamental investigation into microscopic pore structures and adsorption–desorption characteristics of long-flame coal represents necessary support for the safe...

Prediction method for the formation drillability based on improved Bi-LSTM

Rock drillability serves as a comprehensive parameter reflecting the difficulty of rock fragmentation during drilling. To address the challenges, this study introduces a Bi-LSTM and Stacked Autoencoder (SAE) hybrid model for predicting the drillability of deep undrilled formation...

Influence of tunnel slope on hydrogen transport–dispersion characteristics and subsequent explosion consequences

To examine how tunnel slope affects hydrogen dispersion and explosion consequences after a leak, this study uses the CFD tool GASFLOW-MPI to simulate hydrogen leakage and dispersion in road tunnels with slopes of 0%, 9%, 18%, and 27%, and explosions in the 0% and 27% cases. Cloud...

Multiscale Pore Architecture and Fractal Heterogeneity of Coal, Shale, and Tight Sandstone: An Integrated HMIP–N2/CO2 Adsorption–NMR Characterization Framework

Abstract Comprehensive characterization of multiscale pore structures in unconventional reservoirs is crucial for evaluating gas storage, migration pathways, and production potential. This study presents an integrated, multimethod investigation of Lower Jurassic low-rank coal, lo...