变压吸附塔内CH4变压浓度梯度变化规律研究
Study on Change Laws of CH4 Concentration Gradient in Pressure Swing Adsorption Tower
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摘要: 变压吸附塔结构尺寸对塔内气体浓度梯度变化与混合气体分离效果具有重要影响。通过建立沟流效应模型与壁效应模型，分析计算压力梯度变化的均衡性，掌握吸附塔内甲烷气体的径向与轴向浓度变化特征，揭示甲烷气体变压浓度梯度变化规律，明确吸附塔内甲烷气体变压浓度梯度与吸附塔尺寸之间的对应关系，从而为氮气与甲烷分离变压吸附塔最优尺寸设计提供技术支持，最终为研制低浓度煤层气变压吸附浓缩装置奠定基础。Abstract: It has important influence of structure size of pressure swing adsorption tower on gas concentration gradient change and mixed gas separation effect. Through the establishment of the channelling effect model and wall effect model, the paper analyzes and calculates the equilibrium of the pressure gradient and masters the gas concentration variation characteristics in the radial and axial of adsorption tower, reveals methane pressure concentration gradient variation under the pressure change condition, clears correspondence between methane concentration gradient in adsorption tower under pressure change condition and adsorption tower size, so as to provide technical support for optimal dimension design of pressure swing adsorption tower in nitrogen and methane separation, and lay the foundation to research low concentration coal-bed gas pressure swing adsorption and concentration apparatus.
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