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Coal Cryogenic Treatment Temperature Response Model under Multiphase Coupling Effect.

Shanxue Zhang1, Zhaofeng Wang1,2,3, Daopeng Fan1

  • 1School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China.

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Summary
This summary is machine-generated.

This study models the temperature changes in freezing gas-containing coal, considering water phase changes and gas adsorption heat. The model accurately predicts temperature fields during cryogenic treatment.

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Area of Science:

  • Geotechnical Engineering
  • Thermodynamics
  • Materials Science

Background:

  • Coal freezing involves complex thermal effects from water phase change and gas adsorption.
  • Accurate temperature field modeling is crucial for understanding coal's response to cryogenic treatment.
  • Existing models may not fully capture the coupled thermal effects in gas-containing freezing coal.

Purpose of the Study:

  • To develop and validate a temperature field model for cryogenic treatment of gas-containing coal.
  • To investigate the influence of water phase change latent heat and gas adsorption exothermic heat on coal's internal temperature.
  • To simulate and characterize the temperature distribution and changes during the freezing process.

Main Methods:

  • Developed an independent simulation platform for gas-containing coal freezing response.
  • Conducted simulation experiments under various ambient cryogenic temperatures.
  • Utilized COMSOL software to construct the internal heat transfer model and validate the mathematical model.

Main Results:

  • The temperature change during cryogenic treatment follows four stages: rapid decline, short stabilization, slow decline, and relative stability.
  • The simulation results show a maximum error of 0.85 K compared to experimental measurements.
  • Lower ambient freezing temperatures accelerate the cooling rate and shorten the water phase change stabilization period.

Conclusions:

  • The proposed mathematical model accurately simulates and characterizes the temperature field of water- and gas-containing coal during cryogenic treatment.
  • The model accounts for the significant thermal effects of water phase change and gas adsorption.
  • Findings provide a reliable tool for analyzing the thermal behavior of coal under freezing conditions.