The thermodynamic response behavior and mechanism of oil-bearing coal under ultrasonic excitation

作者：Min Yan, Huilin Jia, Hanxi Luo, Fan Yang, Haifei Lin · 发表于：Fuel · 年份：2025 · DOI：10.1016/j.fuel.2025.136411 · 被引用次数：7 · 研究领域：Coal Properties and Utilization、Coal and Coke Industries Research、Hydrocarbon exploration and reservoir analysis

In order to study the thermodynamic response behavior and its influence mechanism of oil-bearing coal under ultrasonic excitation, a self-designed experimental platform is constructed to monitor the thermodynamic response and temperature rise of ultrasonically excited coal, and oil-bearing coal is studied under an ultrasonic power of 900 W and a frequency of 28 kHz to determine the law of temperature rise of ultrasonically excited oil-bearing coal. At the same time, in combination with nuclear magnetic resonance (NMR), Fourier infrared spectroscopy (FTIR) and other experiments, the relationship between the thermodynamic response behaviour of ultrasound and the porosity structure of oil-bearing, the crude oil distribution and the functional groups of oil-bearing coal is explored, and the underlying mechanism of action by which ultrasonic excitation affects the thermodynamic response behaviour of oil-bearing coal is elucidated. Under ultrasonic excitation, the heating rate exhibits a three-phase evolution (rapid, slow, and decelerated heating), with crude oil content and distribution governing the spatial temperature profile on coal surfaces, where higher oil content expands the relatively high-temperature zone, peaking at a 118.3 % increase for 10 % oil-bearing coal. The rule for the temperature rise of the various liquid media is: crude oil > oil–water mixture > water. During ultrasonic excitation, the thermal damage caused by the thermodynamic response of coal is mainly refl...