碱土金属卤化物吸附过程热力学亚稳态机制、动态特性优化及衰减抑制研究

项目名称： 碱土金属卤化物吸附过程热力学亚稳态机制、动态特性优化及衰减抑制研究

项目编号： No.51476093

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 能源与动力工程

项目作者： 赖艳华

作者单位： 山东大学

项目金额： 83万元

中文摘要： 针对碱土金属卤化物(AEMH)吸附过程中伪平衡区、性能衰减机制不明及动态吸附特性不稳定，致使系统性能波动、效率低的难题。本项目拟从AEMH及其络合物的亚稳态特性切入，构建伪平衡区热力学平衡态方程，研究伪平衡区发生、发展及其演变的规律，获得有效调控伪平衡区的措施；研究运行工况对动态吸附特性的影响，揭示伪平衡区对导热、传质及反应动力学的影响规律，构建导热及传质动态模型，引入吸附剂微观形貌因子，发展反应动力学模型，通过吸附床实验对模型验证和修正，形成符合实际的动态特性数学模型，为吸附床设计优化和系统性能预测及改善提供理论支撑；以自由能量化表现AEMH亚稳态的状态，明确其性能衰减与分子有序度的关系，揭示亚稳态与性能衰减的内在机制，以此建立制备因素对亚稳态影响的数学表达，获得吸附剂衰减机制及复合吸附剂抑制衰减原理，为高性能AEMH复合吸附剂开发及系统运行性能改善提供重要的理论和技术支撑。

中文关键词： 伪平衡区；亚稳态；衰减；复合吸附剂；传热传质

英文摘要： To solve the problems, system performance fluctuating and low efficiency, which are caused by the unstable dynamic adsorption character and unclear-cut mechanisms of pseudo-equilibrium area and performance attenuation during alkaline earth metal halide (AEMH) adsorption process, the thermodynamic equilibrium equations of pseudo-equilibrium area are built with considering the metastable character of AEMH and its clathrate, and then the discipline of pseudo equilibrium area's occurrence, development and evolution process are studied, the measures to control pseudo-equilibrium area are acquired. Secondly, effects of operation conditions on dynamic adsorption characteristic are studied, and the influencing rules of pseudo-equilibrium area on heat conduction, mass transfer and reaction kinetics are revealed, furthermore dynamic model of heat conduction and mass transfer is constructed, at the same time, the reaction kinetic model is developed by introducing a microstructure factor of adsorbent. Through verification and correction of the model with experiments of adsorption bed, a more practical mathematic model is eventually developed, and the theoretic foundation that can be used for adsorption bed design optimization and system performance prediction & improvement is provided. At last, the metastable state of AEMH is quantified by free energy, and the relationship between its performance attenuation and molecular degree of order is defined. The inner mechanisms of metastable state and attenuation performance are also revealed. After that, the mathematical relationship between preparation factors and metastable state is built, and then the mechanism of adsorbent attenuation and the theory of composite adsorbent inhibiting attenuation are acquired. All in all, important theory and technical support can be established for developing high performance AEMH composite adsorbents and improving system operation performance.

英文关键词： Pseudo-equilibrium area;metastable state;attenuation;compound adsorbent;heat and mass transfer