Test and analysis of displacement efficiency of CO2 replacing CH4

doi:10.16265/j.cnki.issn1003-3033.2020.02.002

Abstract

Abstract: In order to study influence of multifactor coupling on displacement efficiency of CO₂ replacing CH₄, with coal samples from Changcun coal mine of Lu'an coal group selected as an example, displacement efficiency was measured by using independently developed physical simulation platform. Then, Box-Behnken test design was carried out with Design Expert software, and a quadratic regression response surface model of displacement efficiency was established under conditions of three factors and three levels. Finally, coupling influence of water content, gas injection pressure and injection temperature was analyzed. The results show that displacement efficiency will increase with the increase of gas injection pressure and injection temperature, and will decrease with the increase of water content. They rank as water content >gas injection pressure > injection temperature according to their influence degree, and injection pressure and injection temperature> injection temperature and water content> injection pressure and water content according to that in quadratic term. Meanwhile, there is interaction between injection pressure and injection temperature, but no interaction between any of them and water content.

Key words: multifactor coupling, CO₂ replacing CH₄, displacement efficiency, response surface, interaction

CLC Number:

X936

ZHOU Xihua, JIANG Pengfei, BAI Gang, NIU Yuping. Test and analysis of displacement efficiency of CO₂ replacing CH₄[J]. China Safety Science Journal, 2020, 30(2): 8-13.

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Test and analysis of displacement efficiency of CO₂ replacing CH₄

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