Spontaneous combustion influenced by surface methane drainage and its prediction by rescaled range analysis

This study established numerical modeling using COMSOLTM to examine the influence of horizontal location and drainage ability of surface borehole on spontaneous combustion in longwall working face gob.Rescaled Range Analysis(R/S analysis)was employed to investigate the chaos characteristic of N2/O2...

Full description

Saved in:
Bibliographic Details
Published in:International journal of mining science and technology 2018-03, Vol.28 (2), p.215-221
Main Authors: Yang, Shengqiang, Hu, Xincheng, Liu, Wei Victor, Cai, Jiawen, Zhou, Xiuhong
Format: Article
Language:English
Subjects:
analysis
Methane
borehole
Hurst
Coal
Coal spontaneous combustion
combustion
Surface
disaster
drainage
drainage
Symbiotic
Hurst index
index
Rescaled
Methane drainage
range
Rescaled range analysis
spontaneous
Surface drainage borehole
Symbiotic disaster
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This study established numerical modeling using COMSOLTM to examine the influence of horizontal location and drainage ability of surface borehole on spontaneous combustion in longwall working face gob.Rescaled Range Analysis(R/S analysis)was employed to investigate the chaos characteristic of N2/O2 ratio from a surface borehole in 10416 working face gob,Yangliu Colliery,China.The simulation results show that there is always a circular‘‘dissipation zone”around the drainage borehole and an elliptic‘‘spontaneous combustion zone”in deep gob.Little influence was found on spontaneous combustion zone on the intake side of the gob but the width of spontaneous combustion zone in middle gob is enlarged,while the depth of spontaneous combustion zone near the return side is reduced.The R/S analysis indicates that the influence of surface borehole on spontaneous combustion can be divided into two stages by the chaos feature of N2/O2:safety drainage stage and spontaneous combustion initiating stage.It can be concluded that the methane drainage from gob through surface borehole can intervene in the distribution of spontaneous combustion zone in gob and the chaos feature of N2/O2 from surface borehole can effectively reflect coal spontaneous combustion condition in gob.
ISSN:2095-2686
DOI:10.1016/j.ijmst.2017.12.004