不同粒徑下煤樣瓦斯吸附熱力學(xué)特性影響實(shí)驗(yàn)研究
[Abstract]:In order to reveal the thermodynamic characteristics of gas adsorption of coal samples with different particle sizes, the isothermal adsorption experiments of coal samples with different particle sizes and temperatures were carried out, and the adsorption heat of each coal sample was calculated by Clausius-Clapeyron equation. According to the Langmuir equation, the gas adsorption free energy equation with standard equilibrium pressure constant was established, and the adsorption entropy of each coal sample was obtained by Gibb-Helmholtz equation. The results show that the adsorption process of coal gas under the influence of different particle size and temperature can still be characterized by Langmuir equation. The adsorption free energy and adsorption entropy of coal samples with different particle sizes are less than 0, ranging from -14.19 ~ 22.27 k / mol ~ (-1) J / m ~ (-1) to 4.83 ~ (3) ~ 6.72 k J/mol and -28.20 ~ (-1) ~ 51.32 J / (mol K);, respectively. With the increase of particle size, the adsorption heat, adsorption free energy and adsorption entropy of coal sample gas increase, and with the increase of temperature, the adsorption free energy of coal sample gas decreases gradually. The experimental results show that the gas adsorption process of coal body is a physical adsorption process of exothermic spontaneous and entropy decreasing.
【作者單位】: 新疆維吾爾自治區(qū)煤炭科學(xué)研究所;西安科技大學(xué)教育部西部礦井開采及災(zāi)害防治重點(diǎn)實(shí)驗(yàn)室;西安科技大學(xué)安全科學(xué)與工程學(xué)院;
【分類號(hào)】:TD712
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