高温阶段褐煤热解渗透的试验研究  

Experimental Research on Pyrolysis and Penetration of Lignite at High Temperature

作　　者：赵雷[1] 胡耀青[1] 

机构地区：[1]太原理工大学采矿工艺研究所,山西太原030024

出　　处：《矿业研究与开发》2014年第1期33-36,共4页Mining Research and Development

基　　金：国家科技支撑计划项目(2007BAB13B00);山西省青年科技研究基金项目(2012021022-4)

摘　　要：采用自主研制的高温三轴热解渗透试验机，测定了在恒定轴压和侧压下，褐煤在不同渗透压力与不同温度（100℃～400℃）条件下平行层理方向的渗透率，并揭示了其演化规律。研究结果表明：不同渗透压下煤体渗透率随温度的变化存在一个极低点300℃，当温度达到极低点时，其渗透率最小；煤体渗透率随温度的变化呈现先降低后缓慢升高。在试验温度内，褐煤的渗透率被峰值划分为两个阶段：100℃至300℃为第一阶段，这个阶段内渗透率呈下降趋势并达到极低点；300℃至400℃为第二阶段，这个阶段内渗透率呈缓慢上升趋势；随着孔隙压力（从1MPa开始）的增加，褐煤在所测温度段内的最大渗透率在逐步减小，但减小的幅度也在逐步降低，这些结论为现场实施褐煤的地下原位热解或气化的传输提供了一些科学的基础数据。Abstract：By utilizing independently high-temperature triaxial testing system for pyrolysis and permeability, under con- stant axial and lateral compressure, the permeability of lig- nite was determined at different osmotic pressure and various temperature （high temperature of 100 ℃～400℃） along the parallel bedding direction, and the evolution rule was re- vealed. The results showed that under different osmotic pressure, lignite permeability firstly decreased with the in- crease of temperature, and reached the lowest point at 300℃, then increased slowly. During the tested temperature, lignite permeability was divided into two stages by peaks. In the first stage （100℃～300℃）, the permeability de- creased and reached the lowest point. In the second stage （300℃～400℃）, the permeability was in a slowly risingtrend. With the increase of pore pressure （from 1 MPa）, the highest lignite permeability within the tested temperature re- duced progressively, but the reducing velocity gradually de- creased. This study provided scientific foundation for under- ground in-situ pyrolytic or gasified transmission of lignite.

关 键 词：高温 渗透压 渗透率 地下原位热解 褐煤 

分 类 号：TD849.2[矿业工程—煤矿开采]