摘要
在原位热解工艺实施过程中,矿体内部温度场分布特征是直接关系到其内部热解效率、热解范围的关键因素。为明确不同温度作用下其传热特性演变机理,本文采用了宏细观相结合的方法研究了热力耦合条件下不同温度对油页岩内部微观孔隙、裂隙结构影响规律及原位热解油页岩过程中其内部温度场的演化特开展了一系列研究。结果表明:在温度逐步升高至600℃过程中,油页岩表面孔隙、裂隙经历了先向内闭合再沿层理扩展再穿层破裂的过程。在热力耦合环境下,矿体内部距热源越近,单位距离温度衰减幅度越大;并且随着温度升高,温度衰减梯度也会随之增加。油页岩垂直层理方向热传导系数随温度升高具有阶段性变化特征,300℃为热传导系数发生转变的阈值温度。该研究成果可为原位热解油页岩工艺实施过程中热解温度的选择和热解范围预测提供一定的基础数据。
In the implementation of in-situ pyrolysis processes,the temperature field distribution within the ore body is a critical factor directly affecting pyrolysis efficiency and thermal propagation range.To clarify the evolution mechanism of heat transfer characteristics under different temperatures,this study adopted a macro-microscopic combined approach to investigate the influence of thermo-mechanical coupling on the micro-pore and fracture structures of oil shale,as well as the evolutionary characteristics of the internal temperature field during in-situ pyrolysis.A series of experiments and analyses were conducted,yielding the following key findings:during gradual heating to 600℃,surface pores and fractures in oil shale underwent a dynamic process:initial inward closure,followed by expansion along bedding planes,and ultimately cross-layer rupture.Under thermo-mechanical coupling conditions,the temperature decay rate increased with proximity to the heat source.Higher temperatures amplified the temperature attenuation gradient.The thermal conductivity perpendicular to bedding planes exhibited staged changes with rising temperature,with 300℃ identified as the threshold temperature for significant shifts in heat transfer coefficients.These results provide foundational data for optimizing temperature selection and predicting thermal propagation ranges in in-situ oil shale pyrolysis processes.
作者
申晴晴
张庆伦
曹志鹏
田佳伟
吴嘉琪
杨少强
Shen Qingqing;Zhang Qinglun;Cao Zhipeng;Tian Jiawei;Wu Jiaqi;Yang Shaoqiang(School of Safety and Emergency Management Engineering,Taiyuan University of Science and Technology,Taiyuan Shanxi 030024,China)
出处
《山西化工》
2025年第4期26-29,共4页
Shanxi Chemical Industry
基金
山西省基础研究计划青年项目(202203021212311)
山西省大学生创新创业训练项目(20240791)
山西省科研实践创新项目(2024SJ306)。
关键词
油页岩
微观结构
传热特性
原位热解
oil shale
pores
heat transfer characteristics
in-situ pyrolysis
作者简介
申晴晴,女,2004年出生,太原科技大学本科在读;通信作者:张庆伦,男,1989年出生,硕士在读,主要从事油页岩原位开采方面研究。
