摘要
为了探究超临界甲烷吸附特征,提出超临界甲烷等温吸附线,并以此为研究基础。根据吸附势理论,计算并绘制了不同温度下吸附相体积随吸附势变化的吸附特性曲线,结果表明不同温度等温吸附特性曲线可用1条曲线或统一方程式表示,这从理论上验证了超临界甲烷在煤表面上的吸附也主要取决于与温度无关的色散力作用。由这种特性建立了超临界甲烷吸附模型,实现了根据已知等温吸附试验数据预测不同温度、压力下的超临界甲烷吸附量,克服现有的等温预测的局限性。但是当温度超过一定范围,吸附相密度不能由极限密度代替,由于分子重排作用,吸附相密度改变,造成预测误差。
In order to explore supercritical methane adsorption characteristics,we propose supercritical methane adsorption isotherm and take it as research basis. We plotted the adsorption characteristic curve that adsorbed phase volume changed with adsorption potential at different temperature by the adsorption potential theory. The results show that the adsorption characteristic curve under different temperature can be represented by a curve or unified equation,which theoretically verifies that the adsorption of supercritical methane on coal surface also depends on the dispersion force and has no relation with temperature. The methane adsorption model was established based on the adsorption characteristics. We realize the goal of predicting supercritical methane adsorption capacity under different pressure and temperature according to isotherm test data,which overcomes the limitations of existing isothermal prediction. But,when the temperature exceeds a certain scope,the density of adsorbed phase can not be replaced by limiting density; due to the molecular rearrangement,the change of adsorbed phase density,it results in the increasing prediction error.
出处
《煤矿安全》
CAS
北大核心
2017年第1期21-23,27,共4页
Safety in Coal Mines
关键词
超临界甲烷等温吸附线
吸附势理论
吸附量
吸附特性曲线
吸附相密度
supercritical methane adsorption isotherm
adsorption potential theory
adsorbing capacity
adsorption characteristic curve
adsorbed phase density
