從煙道氣中去除二氧化碳是解決氣候變化問題的重要措施之一。當(dāng)前,基于該項技術(shù)的工業(yè)凈化系統(tǒng)報道很少,也鮮有研究者對此進(jìn)行專業(yè)化的研究。為此,吸附作為一種正在發(fā)展且相當(dāng)重要的技術(shù),對其進(jìn)行深入的研究也迫在眉睫。目前,己經(jīng)開發(fā)了多尺度模型來模擬固定床吸附塔中氣體混合物（CO2 and H2）的動力學(xué)和流體動力學(xué)。本文應(yīng)用了變壓吸附（PSA）和溫變吸附（TSA）兩種吸附技術(shù),確定了理想的操作條件,對吸附反應(yīng)進(jìn)行了不同變量的考察,并將模擬結(jié)果與實驗數(shù)據(jù)進(jìn)行了比較。PSA由于易于操作,可靠性和可重復(fù)性,通常其性能優(yōu)于TSA操作。本文開發(fā)出一維多尺度模型,通過求解偏微分方程（PDE）來生成吸附CO2/H2的突破曲線,其中的偏微分方程包括守恒方程,狀態(tài)方程模型等,使用Comsol Multiphysics軟件,模擬并分析吸附劑小球在中孔和微孔中的傳質(zhì)過程。在不同的操作條件下,本文開發(fā)的模型可以很好地匹配文獻(xiàn)實驗數(shù)據(jù)。選擇CO2和H2的混合物作為吸附物,選擇UiO-67/MCM-41 MOF混合物作為吸附劑。為了模擬CO2和H2的穿透曲線,采用了線性吸附力模型（LDF）,該數(shù)學(xué)模型己用于預(yù)測不同條件下C... 

【文章來源】：北京化工大學(xué)北京市 211工程院校 教育部直屬院校

【文章頁數(shù)】：92 頁

【學(xué)位級別】：碩士

【文章目錄】：
學(xué)位論文數(shù)據(jù)集
Abstract
摘要
CHAPTER 1 LITERATURE REVIEW
    1.1 Introduction and literature review
    1.2 Evidence and consequences of global warming
    1.3 Long term effects
    1.4 Management
2 Capture">    1.5 CO₂ Capture
2 capture">    1.6 Method of CO₂ capture
    1.7 Adsorption
        1.7.1 History
    1.8 Types of adsorption isotherms
    1.9 Adsorbent for gas separation
        1.9.1 Zeolites
        1.9.2 Activated carbon
        1.9.3 Metal organic frameworks （MOFs）
    1.10 Mass transfer resistance
        1.10.1 Macro-pore diffusional resistance
        1.10.2 Meso and micro-pore diffusional resistance
    1.11 Literature on CFD simulation of multiscale fixed bed adsorption
    1.12 Introduction to COMSOL multiphysics
    1.13 Thesis structure
CHAPTER 2 MODELING AND SIMULATION METHODOLOGY
    2.1 Description of model
    2.2 Processes of numerical simulations
        2.2.1 Pre-processing
        2.2.2 Processing
        2.2.3 Post processing
    2.3 Mathematical modeling
        2.3.1 Governing equations
        2.3.2 Shape
    2.4 Mass balance equations
        2.4.1 Mass transfer correlation
        2.4.2 Initial & boundary conditions for mass transfer equations
    2.5 Heat transfer
        2.5.1 Initial & boundary conditions for heat transfer equations
    2.6 Isotherms
    2.7 Predictive correlations for model parameters
    2.8 Pressure drop
    2.9 Equation of state
    2.10 Porosities
    2.11 Numerical setup of model
    2.12 Model validation
        2.12.1 Validation of breakthrough curve for single component model:
        2.12.2 Validation of breakthrough curve for binary mixtures model:
CHAPTER 3 MASS TRANSFER PROFILES STUDY AT MULTISCALE LEVELSFOR CO2 ADSORPTION USING DIFFERENT CAPTURE MATERIALS
    3.1 Introduction
    3.2 Pressure swing adsorption
    3.3 Selected case
    3.4 Results and discussion
2 concentration factor">    3.5 Effect of velocity on bed CO₂ concentration factor
    3.6 Temperature swing adsorption （TSA）
    3.7 Adsorption step
    3.8 Effect of bed height
    3.9 Effect of CO2 concentration on temperature
2/H₂ MIXTURES AND PARAMETRIC STUDY ON BREAKTHROUGH">CHAPTER 4 A LINEAR DRIVING FORCE APPROXIMATION FOR ADSORPTIONOF CO₂/H₂ MIXTURES AND PARAMETRIC STUDY ON BREAKTHROUGH
    4.1 Introduction
    4.2 Material and adsorption isotherms
        4.2.1 Material characteristics
        4.2.2 Adsorption isotherms
        4.2.3 Binary adsorption on UIO-67/MCM-41
    4.3 Linear driving force （LDF） approximation
        4.3.1 Introduction
    4.4 Results and discussion
        4.4.1 Comparison between LDF approximation and breakthrough experiment
    4.5 Reference breakthrough experiment
    4.6 Parameter estimation
    4.7 Breakthrough and temperature profiles
    4.8 Effect of temperature, pressure and composition
    4.9 Parametric study of bed porosity, feed velocity and particle size on breakthrough
        4.9.1 Effect of bed porosity
        4.9.2 Effect of particle size
        4.9.3 Effect of feed velocity
    4.10 Hydrogen recovery
Chapter 5 Conclusion
REFERENCES
ACKNOWLEDGEMENT
INTRODUCTION TO SUPERVISOR
INTRODUCTION TO AUTHOR
附件



本文編號：3107367