CHU T X, SU Y Y, CHEN Y X.Study on the influence of water losing on crushed coal porosity[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(3):42-49.

doi:10.16186/j.cnki.1673-9787.2022010037

Received:2022/01/13

Revised:2022/08/31

Published:2023/05/25

Study on the influence of water losing on crushed coal porosity

CHU Tingxiang1, SU Yuanyuan1, CHEN Yuexia2

1.School of Mine Safety，North China Institute of Science and Technology，Sanhe  065201，Hebei，China;2.School of Emergency Technology and Management，North China Institute of Science and Technology，Sanhe  065201，Hebei，China

Abstract:In order to study the water loss law and porosity evolution characteristics of broken coal，the experimental test and analysis on the relationship between water loss and porosity change of broken coal were carried out by controlling the environmental temperature，coal sample particle size and initial water content.The results showed that after soaking，the macroscopic volume of all coal samples increased compared with that of dry coal samples，and the porosity decreased with the dispersion of water，which was still larger than that of dry coal samples；The higher the ambient temperature was，the smaller the particle size was and the greater the initial water content was，the greater the porosity was after water immersion，and the same law still existed in the stage of water loss；The swelling effect of water immersion，the effect of thermal expansion and the decrease of liquid bridge tension between particles were the main causes of the change of void ratio in the process of coal moisture loss；For the coal sample after water loss，the residual part had unequal void volume，resulting in the increase of void ratio and coal oxygen contact area.

Key words:water soaked coal;water loss law;porosity;swelling

水分散失对破碎煤体空隙率变化的影响研究_褚廷湘.pdf