不同含水饱和度煤芯瓦斯解吸规律数值模拟研究

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中图分类号：S157 文献标志码：A 文章编号：2096-9902（2025）23-0062-05

Abstract：Inordertostudythegasdesorptionanddifusionlawofwater-containingcoalcore，basedonthedouble-pore structureofthe matrixporeandcracksystemofcoalsample，thegoverningequationofgas-liquidtwo-phaseflowin poresand cracksundercylindricalcordinateswasderived，andathree-dimensionalmathematicalmodelofgasmigrationinwater containing coalcorewasestablished.TheCOMSOLnumerical simulationsoftwarewasused toanalyzethegas desorption lawof coalcoreunderdiferent matrixwatersaturationandcrackwatersaturationconditions.Theresultsshowthatthegasdesorption amountandinitialgasdesorptionrateareinverselyproportionaltothematrixwatersaturation，andpostivelyproportonaltothe crackwatersaturation.Withtheincreaseofthematrixwatersaturation，thegasdesorptionamountandinitialgasdesorptinrate decreased by 28.9% and 89.2% ，respectively. With the increase of the crack water saturation，the gas desorption amount and initial gas desorption rate increased by 3.78% and 1.2% ，respectively.

Keywords： coal core;gas desorption; gas-liquid two-phase flow; water saturation; numerical simulation

明确煤芯瓦斯解吸扩散规律是精准测定煤层瓦斯含量的基础[-3]，随着矿井采深的不断增大，煤层赋存条件更为复杂，煤层含水量也随之改变，测定煤层气含量时取出的煤芯往往含有一定量的水分，水分的存在会对瓦斯的运移产生显著影响，因此研究含水煤芯瓦斯解吸规律对煤层瓦斯含量准确测定及开发应用具有一定指导意义[4-7]。（剩余5312字）