THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

online first only

Experimental study on resistivity response characteristics of loaded coal during nitrogen injection

ABSTRACT
In order to explore the evolution of coal cracks during nitrogen injection, the resistivity response tests of coal during nitrogen injection were carried out. The research shows that during the nitrogen injection process, the resistivity of the coal remains basically unchanged at first, then increases slowly, and increases suddenly and stabilizes at about 1.2finally. The nitrogenadsorption ofcoal leads to a decrease in resistivity, and the higher the nitrogen pressure is, the greater the decrease in resistivity will be. The development of fissures in the coal will affect the conduction channel, resulting in an increase in resistivity. In the process of nitrogen injection, the resistivity change of the loaded coal is the result of the combined effect of the nitrogen adsorption of coal and the expansion of the fissures of the coal.
KEYWORDS
PAPER SUBMITTED: 2022-02-25
PAPER REVISED: 2022-12-04
PAPER ACCEPTED: 2022-12-11
PUBLISHED ONLINE: 2023-01-21
DOI REFERENCE: https://doi.org/10.2298/TSCI220225011W
REFERENCES
  1. Wang S.,et al., Permeability Evolution of Naturally Fractured Coal Injected with High-temperature Nitrogen: Experimental Observations, Processes, 9(2021), 2, Article ID 296
  2. Yuan L., Strategic Thinking of Simultaneous Exploitation of Coal and Gas in Deep Mining, Journal of China Coal Society,41(2016), 1, pp.1-6
  3. Xie H.,et al., Theories and Technologies for in-situ Fluidized Mining of Deep Underground Coal Resources, Journal of China Coal Society,43(2018), 5,pp.1210-1219
  4. Wang S.,et al., A Novel TriaxialApparatus to Evaluate the Effect of High-temperature Nitrogen Injection: Concept and Design. Thermal Science, 25(2021), 6B, pp.4527-4535
  5. LeiD.,et al., Experimental Study on Characteristics of Water Containing Coal Complex Resistivity Dispersion, Journal of Loss Prevention in the Process Industries, 56(2018), 9, pp.328-333
  6. Liu B., et al., Application of Electrical Resistivity TomographyMonitoring System to Mine Water Inrush Model Test,Chinese Journal of Rock Mechanics and Engineering, 29(2010), 2,pp.297-307
  7. Wang E.,et al., Resistivity Response in Complete Stress-strain Process of Loaded Coal, Journal of China Coal Society, 39(2014), 11, pp.2220-2225
  8. Ma Y., et al., Laboratory Test Research on Borehole Strain and Electrical Resistivity Response Characteristic of Coal Samples in Hydraulic Fracture Process, Chinese Journal of Rock Mechanics and Engineering,35(2016), S1,pp.2862-2868
  9. Chen P. et al., Experimental Study on Resistivity Variation Regularities of Loading Coal, Journal of China Coal Society,38(2013), 4, pp.548-553
  10. Lyu C., et al., Experiment Study on the Correlation Between the CO2Adsorption Capacity and Electrical Resistivity of Coal with Temperature Effect, Greenhouse Gases-Science and Technology,(2019), 7,pp.1-10
  11. Li X.,et al., Analysis of Resistivity Anisotropy of Loaded Coal Samples, Advances in Materials Science and Engineering, (2020), 3,pp.1-13
  12. Chen P., et al.,Regularity and Mechanism of Coal Resistivity Response with Different Conductive Characteristics in Complete Stress-strain Process, International Journal of Mining Science and Technology, 25(2015), 8,pp.779-786
  13. Yang, X.J., et al., On the Theory of the Fractal Scaling-law Elasticity, Meccanica, 57(2022), 4, pp.943-955
  14. Yang, X. J., An Insight on the Fractal Power Law Flow: from a Hausdorff Vector Calculus Perspective, Fractals, 30(2022), 3, pp.2250054-929
  15. Yang, X. J., The Vector Power-Law Calculus with Applications in Power-Law Fluid Flow, Thermal Science, 24(2020), 6B, pp.4289-4302
  16. Yang, X. J, The Vector Calculus with Respect to Monotone Functions Applied to Heat Conduction Problems, Thermal Science, 24(2020), 6B, pp.3949-3959
  17. Yang, X. J., A New Insight into Vector Calculus with Respect to Monotone Functions for the Complex Fluid-Flows, Thermal Science, 24(2020), 6A, pp.3835-3845