THERMAL SCIENCE

International Scientific Journal

Sheng-Cheng Wang

,

Ya-Nan Gao

,

Lan-Ying Huang

,

Hai-Jian Li

,

Shan-Jie Su

A NOVEL TRIAXIAL APPARATUS TO EVALUATE THE EFFECT OF HIGH TEMPERATURE NITROGEN INJECTION CONCEPT AND DESIGN

ABSTRACT
High temperature nitrogen, injection into coal seams is supposed to improve the per­meability and thus maintain the safety of underground mining. A novel triaxial appa­ratus is recently developed, aiming at providing the effective method to evaluate the effect of high temperature nitrogen injection. The main feature of this novel appara­tus is its high confining pressure, gas injection with high pressure as well as the high temperature. This new device can be either used for natural coal samples (e.g. intact or fractured) or the synthetic coal samples. A series of leakage tests were conducted to verify the feasibility of this instrument, the results of which have confirmed that the maximum pressure (i.e. 10 MPa) can be reached. In addition, the high temperature and pressure of nitrogen gas can also be sustain at the requested level. Based on the preliminary tests on the instrument, a large amount of tests were carried out to eval­uate the effect of nitrogen injection in enhancing the permeability of coking coal from the Pingdingshan coalfield, China, and the influence of high temperature nitrogen injection on mechanical parameters of coal was obtained.
KEYWORDS
triaxial test, nitrogen injection, high temperature, high pressure, low permeability
PAPER SUBMITTED: 2021-06-01
PAPER REVISED: 2021-07-25
PAPER ACCEPTED: 2021-08-10
PUBLISHED ONLINE: 2021-12-24
DOI REFERENCE: https://doi.org/10.2298/TSCI2106527W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 6, PAGES [4527 - 4535]
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A novel triaxial apparatus to evaluate the effect of high temperature nitrogen injection concept and design

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence