Study on influencing factors of coal permeability enhancement under effect of phase change thermal storage

Abstract

In order to study the influencing factors of coal permeability enhancement under the effect of phase change thermal storage, coal permeability enhancement experiment and coal gas seepage experiment were conducted, and the effects of thermal storage transition temperature, phase change times, liquid content and crushing degree on the permeability change of coal were analyzed respectively. The results showed that the coal permeability increased linearly with the increase of phase transition temperature; the liquid content and phase change times were main important factors of the coal permeability enhancement under the effect of phase change thermal storage. With the increase of the liquid content of coal or the phase change times of phase change thermal storage, the coal permeability increased exponentially as a whole, and the maximum increased to 556.04% and 406.92% respectively. However, when the number of phase change times reached to a certain value, the increase of coal permeability slowed down gradually. And the permeability enhancement effect of coal was closely related to the degree of coal crushing, when the degree of coal crushing was high, the increase degree of the coal permeability was also more obvious.

Keywords

• coal permeability enhancement
• phase change thermal storage
• permeability
• influencing factor
• change law