Taylor流下微细颗粒增强CO2:吸收研究（英文）

The physical absorption of CO2 in water containing different types of particles was studied in a microchannel operated under Taylor flow.The maximum enhancement factors of 1.43 2.15 were measured for activated carbon (AcC) particles.The analysis shows that the enhancement effect can be attributed to the shuttle mechanism.Considering the separate contributions of mass transfer from bubble cap and liquid film,a heterogeneous enhancement model is developed.According to this model,the enhancement factors E Cap,E Film and E Ov are mainly determined by mass transfer coefficient KL (KL,Cap and KL,Film),adsorptive capacity of particles m,and coverage fraction of particles at gas-liquid interface ζ.With both effects of particle-to-interface adhesion and apparent viscosity included,the model predicts the enhancement effect of AcC particles reasonably well.     

CO2-乙醇体系中界面对流的混合格子Boltzmann方法三维模拟及实验验证（英文）

By using a hybrid lattice-Boltzmann–finite-difference method (hybrid LBM–FDM method), three-dimensional simulations of solutal interfacial convection were conducted for the process of CO2 absorption into ethanol. A self-renewal interface model is adopted as an interfacial perturbation model. The simulation results revealed some three-dimensional features of the induced interfacial convection, such as the development of diverging cellular flow and Rayleigh plume-like convection in liquid phase. The concentration distribution of the simulation result is validated and found to be in wel agreement with the Schlieren visualization results qualitatively. Addi-tionally, the mass transfer enhancements by interfacial convection were investigated via both simulation and experiment for the absorption process, and the mass transfer is shown to be enhanced by the interfacial convec-tion by about two-fold comparing with that by diffusion.     

填料塔中AEE与MEA混胺对低浓度CO2的吸收

在常压下考察了体积分数20%乙醇胺（MEA）+2% N-甲基二乙醇胺（MDEA）与20%羟乙基乙二胺（AEE）+ 2% N-甲基二乙醇胺（MDEA）有机胺水溶液对CO2的吸收及解吸效果。考察了静态吸收和中试动态吸收实验。实验结果表明：在吸收温度及解吸温度相同的条件下,20%羟乙基乙二胺（AEE）+2% N-甲基二乙醇胺（MDEA）吸收剂对CO2的吸收及解吸效果要好于20%乙醇胺（MEA）+2% N-甲基二乙醇胺（MDEA）,而且不易降解。达到同样的解吸效果,20%羟乙基乙二胺（AEE）+2% N-甲基二乙醇胺（MDEA）吸收剂的能耗要低10%左右,具有较好的工业应用前景。     

填料塔中乙二胺/磷酸溶液吸收SO2的体积总传质系数

SO2减排已经成为国际关注的焦点问题,近年来,湿法烟气脱硫技术以其脱硫效率高、适应范围广、技术成熟等优点,成为当今占主导地位的烟气脱硫方法。可再生胺法脱硫技术作为一种新的脱硫方法得到了普遍关注。为进一步的工业设计提供参考依据,今采用乙二胺/磷酸溶液为吸收剂,测定和计算了在填料塔中乙二胺/磷酸溶液吸收烟气中SO2的体积总传质系数KGa,并研究了液气比、乙二胺浓度、进口气体中初始SO2浓度、吸收液初始pH值及反应温度对KGa的影响。实验结果表明,KGa随液气比的增大、乙二胺浓度的升高、吸收液初始pH值的增大而增大;体积总传质系数随初始SO2浓度的升高、反应温度的升高而降低。     

微通道内乙醇胺吸收CO2的过程特征（英文）

Process characteristics of CO2 absorption using aqueous monoethanolamine(MEA) in a microchannel reactor were investigated experimentally in this work.A T-type rectangular microchannel with a hydraulic diameter of 408 μm was used.Operating parameters,i.e.temperature,pressure and molar ratio of MEA to CO2 were studied.Under 3 MPa pressure,the mole fraction of CO2 in gas phase could decrease from 32.3% to 300×10?6 at least when gas hourly space velocity ranged from 14400 to 68600 h?1 and molar ratio of MEA to CO2 was kept at 2.2.In particular,the effects of temperature on CO2 absorption flux,mass transfer driving force,gas-liquid contact time and en-hancement factor were analyzed in detail and found that mass transfer enhancement by chemical reaction was a crucial factor for the process of CO2 absorption.     

鼓泡浆态床反应器中传质对费托合成的影响

采用建立数学模型的方法在鼓泡浆态床反应器体系中讨论了传质对费托合成反应行为的影响.通过改变传质系数定性探讨了费托合成反应体系传质控制和动力学控制,并给出了其三维示意图.在传质控制区,重点讨论了传质的变化对费托合成反应产物分布的影响.结果表明,在传质控制区,传质增强,产物烯烷比增大,甲烷选择性降低.传质增强,将促进重组分的生成.     

采用纳米Al203和碳纳米管颗粒强化CO2吸收的理论及实验研究（英文）

The influence of nano-particles on CO2 absorption was studied experimentally in a stirred thermostatic reactor. Nano-A1203 and carbon nanotube （CNT） particles which showed different hydrophobic properties were chosen for the investigation. The experimental results were compared with that of micron-size activated carbon （AC） and Al2O3 particles. From the results, no enhancement by micron-size A1203 was found, and with the increase of A1203 concentration, the enhancement factor decreased. However, nano-Al203 showed a weak enlaancement tor me COz absorption. AC and CNT particles all intensified the gas-liquid mass transfer effectively, yet the trend of the enhancement factor with stirring speed for the two particles was different. With increasing stirring speed, the enhancement factor of AC particles was decreased, wl＇iereas in CNT suspensions it was increased. The experimental phenomena demonstrated a difference in enhancement mechanism for different size particles. For nano-particles, besides the influence of adsorbability and hydrophobicity, the micro-convection caused by Brownian motion should be also taken into account. Considering the micro-convection effect, a theoretical model was developed to shed light on the absorption enhancement bv nano-oarticles.     

烟气飞灰在θ环填料塔中对单乙醇胺溶液脱除CO2传质性能的影响

本文将烟气飞灰加入液相中,采用小型散堆θ环填料塔分析了飞灰对于单乙醇胺(MEA)溶液脱除CO₂传质性能的主要影响规律与机理,着重研究了各种操作参数条件下体积总传质系数K_Ga_v所受飞灰的影响。所得结果显示:在加入飞灰之后,减小了K_Ga_v值;而溶液温度的增加将会影响K_Ga_v值的提高,此外,K_Ga_v受飞灰的负面效应呈现出逐渐提高的趋势;而增大液气比则会使体积总传质系数K_Ga_v线性提高,同时,飞灰的影响则逐步地变弱;增加填料高度,K_Ga_v增加,而飞灰对K_Ga_v的负面影响逐渐增强;在逐渐增大飞灰浓度之后,飞灰对于体积总传质系数K_Ga_v所起的抑制作用也相应增强。     

CO2对储层的影响研究

延长油气田属于低渗、特低渗油气藏,基本无自然产能,压裂改造是低渗致密油气藏高效开发的最有效手段。目前CO₂地质埋存与驱油提高老油田采收率试验已经在延长油田大力开展,为了更好地指导CO₂在延长油田进一步的应用,本文以延长油田储层为研究对象,首先合成了一种阳离子型有机硅表面活性剂作为岩心清洗剂清洗岩石孔喉内的杂质,然后利用高温高压反应釜探索不同温度压力条件下,CO₂对储层岩石的影响;通过填砂管驱油试验考察CO₂对储层作用后对采收率的影响。为进一步做好CO₂的现场应用奠定基础。     

五乙烯六胺改性制备CO2吸附剂及其对模拟烟气中CO2捕集性能的研究（英文）

A novel solid support adsorbent for CO2 capture was developed by loading pentaethylenehexamine (PEHA) on commercial y available mesoporous molecular sieve MCM-41 using wet impregnation method. MCM-41 sam-ples before and after PEHA loading were characterized by X-ray powder diffraction, N2 adsorption/desorption, thermal gravimetric analysis and scanning electron microscope to investigate the textural and thermo-physical properties. CO2 adsorption performance was evaluated in a fixed bed adsorption system. Results indicated that the structure of MCM-41 was preserved after loading PEHA. Surface area and total pore volume of PEHA loaded MCM-41 decreased with the increase of loading. The working adsorption capacity of CO2 could be significantly improved at 60%of PEHA loading and 75 °C. The effect of the height of adsorbent bed was investigated and the best working adsorption capacity for MCM-41-PEHA-60 reached 165 mg·(g adsorbent)?1 at 75 °C. Adsorption/desorption circle showed that the CO2 working adsorption capacity of MCM-41-PEHA kept stable. ? 2014 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. Al rights reserved.     

反应时间对CO2处理镁钙砖表面的影响

为了解决镁钙砖的水化问题,采用CO2对其进行表面处理。在水汽温度40℃、试验温度700℃、CO2流量4 L·min-1的条件下研究了不同反应时间(0～240 min)对镁钙砖表面的影响,利用扫描电镜检测表面生成物和反应层厚度,并采用煮沸试验法检测抗水化效果。结果表明:经CO2处理后的镁钙砖表面可生成CaCO3保护膜;随着反应时间的延长,试样表面的反应层厚度逐渐增加,当反应时间为180 min时,试样表面反应层厚度达110.5μm,抗水化效果最好。     

修饰的COF-102吸附和分离CO2/CH4的计算机模拟（英文）

Covalent organic framework (COF) is a porous material with low density and large BET (Brun-auer-Emmett-Teller) surface area. They have great potential in gas adsorption and separation. In this work, the ad-sorption of pure CO2 and CO2/CH4 mixture on modified COF-102 was simulated by using GCMC (grand canonical Monte Carlo). Metal Li was incorporated into COF-102 through three doping methods, including charge exchange, O--Li+ dipolar interaction and O--Li+ chemical bonding. The influence of Li doping on the adsorption of CO2 was studied. The results showed that among the three methods, the dipole doping is the best way to improve CO2 ad-sorption performance. Further, the ligands of COF-102 were replaced by extended aromatic moieties, such as di-phenyl and pyrene. The adsorption capacity of CO2 and CH4, and the selectivity of CO2/CH4 on the ligand-replaced COF-102 were studied. The capacity of CO2 and CH4 on the ligand-replaced COF-102 had obvious changes; hence the selectivity of CO2/CH4 can be adjusted accordingly.     

纳米颗粒及分散剂对TETA溶液吸收CO2的影响

为探究纳米颗粒对TETA溶液吸收CO₂的影响及分散剂对纳米流体吸收CO₂的促进效果,采用两步法配制了不同纳米颗粒种类及粒径、不同震荡时间、不同TETA浓度、不同纳米颗粒固含量和不同分散剂固含量及种类的纳米流体,搭建TETA溶液鼓泡吸收CO₂试验台,分别测试了不同工况下制备的纳米流体对CO₂的吸收情况,并与空白TETA溶液进行对比。结果表明,纳米流体的脱除率增强系数随着纳米颗粒质量分数的增加而先提升后降低,粒径较大的纳米颗粒具有较好的传质性能,大尺寸可以减少相对表面积和能量,使得纳米颗粒的表面和量子尺度效应减弱;CO₂吸收速率在初始阶段随着超声破碎时间的增加而提升,但超声破碎时间超过1 h,吸收速率减缓;TETA浓度及纳米颗粒固含量影响试验中,随着浓度及固含量上升,脱除率增强系数均呈现先升高后降低的趋势,存在最佳值。综上,在浓度1 mol/L的TETA中添加固含量0.1%、粒径60 nm的TiO₂,经超声震荡1 h后对CO₂的吸收效果最好,脱除率增强系数最高可达1.9。以TiO₂-TETA-H₂O纳米流体为基液在其中添加C-Na、SDBS、X-100等分散剂时,由于TiO₂颗粒表面带正电荷,分散剂类型对TiO₂-TETA-H₂O纳米流体稳定性的影响大致呈现以下趋势:阴离子型>非离子型>阳离子型,且以双电子层理论为依据,添加阴离子型分散剂C-Na的质量分数为0.1%时对阳离子型纳米流体TiO₂-TETA-H₂O的稳定效果最好。     

共沸混合物（R290/CO2）跨临界动力循环性能分析（英文）

Low critical temperature limits the application of CO2 trans-critical power cycle. The binary mixture of R290/CO2 has higher critical temperature. Using mixture fluid may solve the problem that subcritical CO2 is hardly con-densed by conventional cooling water. In this article, theoretical analysis is executed to study the performance of the zeotropic mixture for trans-critical power cycle using low-grade liquid heat source with temperature of 200 °C. The results indicated that the problem that CO2 can't be condensed in power cycle by conventional cooling water can be solved by mixing R290 to CO2. Variation trend of outlet temperature of thermal oil in super-critical heater with heating pressure is determined by the composition of the mixture fluid. Gliding temperature causes the maximum outlet temperature of cooling water with the increase of mass fraction of R290. There are the maximum values for cycle thermal efficiency and net power output with the increase of supercritical heating pressure.     

Co掺杂对（CeO2）0.92（Y2O3）0.06（La2O3）0.02电解质材料性能的影响

采用固相合成法合成CeO2基粉料(1-x)(CeO2)0.92(Y2O3)0.06(La2O3)0.02+xCoO1.5(x=0,0.5 mol%,1mol%和2mol%),并在不同温度下烧成。采用X射线衍射(X-ray diffraction,XRD)、Archimedes法、交流阻抗谱和热膨胀仪分别测试电解质材料的晶体结构、体积密度、离子电导率和热膨胀。结果表明:掺杂Co的试样经1500℃烧成后均为单一的立方萤石结构相,Co可以有效提高试样的烧结性能,降低烧结温度100℃;试样的晶界电导随着Co含量的增加而提高,当Co掺杂量为2mol%时,试样在700℃时表现出最高的离子电导率0.051s.cm-1。同时发现Co的掺杂对试样的热膨胀影响不大。     

阳离子表面活性剂喷涂对ZnMg棒状双金属氢氧化物电催化还原CO2产CO性能影响

CO₂还原电催化剂已成为近几年催化领域的研究热点,但CO₂还原常伴随着竞争析氢反应,这直接导致了能源的浪费。本文通过水热合成制备出一种高效还原CO₂为CO的锌镁双金属氢氧化合物[ZnMg(OH)₄],并引入阳离子表面活性剂来抑制析氢副反应。以ZnMg(OH)₄为载体通过喷涂法将阳离子表面活性剂十六烷基三甲基溴化铵(C₁₉H₄₂BrN,CTAB)涂覆在催化剂表面,形成ZnMg(OH)₄-CTAB复合催化剂,并对催化剂的晶体结构、形貌进行表征,通过一系列电化学测试对催化剂电催化CO₂还原性能进行评估。在电势-1.5V (vs.RHE)下,表面涂覆阳离子表面活性剂CTAB能使样品的CO法拉第效率从78.2%提高至87.25%。结果表明,在催化剂表面涂覆阳离子表面活性剂形成的复合催化剂ZnMg(OH)₄-CTAB具有较高的CO₂还原性能,这与阳离子表面活性...     

聚乙二醇对聚合氯化铝制备γ-Al2O3的影响（英文）

A polyaluminium chloride solution with high Al 13 content self-prepared was used as material for preparing the spherical γ-Al 2 O 3 by the sol-gel and oil-drop method. Polyethylene glycol with different molecular mass was used as surfactant to investigate the effect on property of γ-Al 2 O 3 . The physical property was characterized by 27 Al NMR (nuclear magnetic resonance) spectra, X-ray diffraction, FT-IR (Fourier transform infrared spectroscopy) and TG-DTA (thermogravimetric-differential thermal analysis). The results showed that surface area, pore volume and pore size of γ-Al 2 O 3 all increased with the increase of polyethylene glycol molecular mass in the experimental research range, and polyethylene glycol 10000 was the most suitable pore forming additive. γ-Al 2 O 3 with surface area of 339 m 2 ·g 1 , pore volume of 0.59 cm 3 ·g 1 and pore diameter of 6.9 nm were obtained at 450 °C.     

杂质对CO2物性的影响分析

在节能减排的大背景下,二氧化碳的捕集和储存(CCS)不但可以减少温室气体的排放,还可以提高原油的采收率(EOR技术),因此研究CCS显得尤为重要。采用不同的二氧化碳捕集方式得到的二氧化碳气体,其杂质组分不一样,而气体杂质对物性有很大影响。本文通过HYSYS研究了二氧化碳的物性参数,分析了杂质对物性的影响。结果表明,密度和黏度会在临界点附近出现突变,比热容则会在临界点附近出现极大值。分析发现,大部分杂质会改变突变点或极大值,但影响不大,H₂S和SO₂对物性参数的影响较大。     

共溶剂对超临界CO2和亚临界CO2中丙烯酸聚合的影响

在13.5 MPa, 335 K条件下,研究了超临界CO     

13C NMR定量分析一乙醇胺（MEA）与CO2的吸收和解吸特性

13C NMR是一种有效的测定有机胺与CO2反应过程中离子浓度变化的检测手段。本文采用13C NMR分析了一乙醇胺(MEA)吸收与解吸CO2过程,吸收与解吸实验温度分别在313K和393K下进行。结果表明,吸收CO2过程中生成了MEA氨基甲酸盐、质子胺MEAH+与HCO3-/CO32-,并且CO2与MEA反应时先生成MEA氨基甲酸盐,当溶液吸收的CO2担载量达到0.455molCO2/mol胺时,才产生HCO3-/CO32-离子。在MEA吸收CO2过程中,MEA氨基甲酸盐的摩尔分数先增加后减少。在解吸过程中,MEA氨基甲酸盐的摩尔分数同样先增加后减少。HCO3-/CO32-在解吸过程中很容易就能被解吸,而生成的MEA氨基甲酸盐中大约有75%在解吸过程中并没有被解吸。