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Effect of reactive surface area of minerals on mineralization trapping of CO_2 in saline aquifers

Petroleum Science 2012年第3期9卷 400-407页

作者： LUO Shu xu ruina JIANG Peixue Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Beijing Key Laboratory of CO_(2) Utilization and Reduction TechnologyDepartment of Thermal EngineeringTsinghua UniversityBeijing 100084China

The reactive surface area, an important parameter controlling mineral reactions, affects the amount of mineralization trapping of CO2 which affects the long-term CO2 storage. The effect of the reactive surface area on the mineralization trapping of CO2 was numerically simulated for CO2 storage in saline aquifers. Three kinds of minerals, including anorthite, calcite and kaolinite, are involved in the mineral reactions. This paper models the relationship between the specific surface area and the grain diameter of anorthite based on experimental data from literature （Brantley and Mellott, 2000）. When the reactive surface areas of anorthite and calcite decrease from 838 to 83.8 m^2/m^3, the percentage of mineralization trapping of CO： after 500 years decreases from 11.8% to 0.65%. The amount of dissolved anorthite and the amounts of precipitated kaolinite and calcite decrease significantly when the reactive surface areas ofanorthite and calcite decrease from 838 to 83.8 m2/m3. Calcite is initially dissolved in the brine and then precipitates during the geochemical reactions between CO2-H20 and the minerals. Different reactive surface areas of anorthite and calcite lead to different times from dissolution to precipitation. The pH of the brine decreases with decreasing reactive surface areas of anorthite and calcite which influences the acidity of the saline aquifer. The gas saturation between the upper and lower parts of the saline aquifer increases with decreasing reactive surface areas of anorthite and calcite. The mass density distribution of brine solution shows that the CO2^＋brine solution region increases with decreasing reactive surface areas ofanorthite and calcite.

关键词： Reactive surface area, mineralization trapping, dissolution precipitation, brine mass density,CO2 geological storage

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Pore-scale visualization on a depressurization-induced CO2 exsolution

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Science Bulletin 2017年第11期62卷 795-803页

作者： ruina xu Rong Li Feng Huang Peixue Jiang Key Laboratory for CO2 Utilization and Reduction Technology of Beijing Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Thermal Engineering Tsinghua University Beijing 100084 China

The pore-scale behavior of the exsolved CO_2 phase during the depressurization process in CO_2 geological storage was *** reservoir pressure decreases when the injection stops or when a leaking event or fluid extraction *** exsolution characteristics of CO_2 affect the migration and fate of CO_2 in the storage site ***,a micromodel experimental system that can accommodate a large pressure variation provides a physical model with homogeneous porous media to dynamically visualize the nucleation and growth of exsolved CO_2 *** pressure decreased from 9.85 to 3.95 MPa at different temperatures and depressurization rates,and the behavior of CO_2 bubbles was *** the pore-scale,the nuclei became observable when the CO_2 phase density was significantly reduced,and the pressure corresponding to this observation was slightly lower than that of the severe expansion pressure *** lower temperature and faster depressurization rate produced more CO_2 *** exsolved CO_2 bubble preferentially grew into the pore body instead of the *** progress of smaller CO_2 bubbles merging into a larger CO_2 bubble was first captured,which validated the existence of the Ostwald ripening *** dispersed CO_2 phase after exsolution shows similarity with the residually trapped CO_*** observation is consistent with the low mobility and high residual trapping ratio of exsolved CO_2 measured in the core-scale measurement,which is considered to be a self-sealing mechanism during depressurization process in CO_2 geological storage.

关键词： Depressurization process CO2 exsolution Ostwald ripening CO2 geological storage

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Theoretical and experimental study of the thermal conductivity of nanoporous media

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Science China(Technological Sciences) 2012年第8期55卷 2140-2147页

作者： JIANG Peixue XIANG Heng xu ruina Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Beijing 100084China Beijing Key Laboratory of CO2 Utilization and Reduction Technology Beijing 100084China Department of Thermal Engineering Tsinghua UniversityBeijing 100084China

The nanoparticle thermal conductivity and nanoscale thermal contact resistance were investigated by molecular dynamics(MD) simulations to further understand nanoscale porous media thermal *** porous media thermal conductivity models were then revised for nanoporous *** effective thermal conductivities of two packed beds with nanoscale nickel particles and a packed bed with microscale nickel particles were then measured using the Hot *** measured results show that the nano/microscale porous media thermal conductivities were much less than the thermal conductivities of the solid *** of the measured and calculated results shows that the revised combined parallel-series model and the revised Hsu-Cheng model can accurately predict the effective thermal conductivities of micro-and nanoparticle packed beds.

关键词： thermal conductivity nanoparticle nanoporous media molecular dynamics(MD) simulation contact resistance

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Review on active thermal protection and its heat transfer for airbreathing hypersonic vehicles

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Chinese Journal of Aeronautics 2018年第10期31卷 1929-1953页

作者： Yinhai ZHU Wei PENG ruina xu Peixue JIANG Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power Engineering Tsinghua University Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University

Hypersonic vehicles with turbojet, ramjet, and scramjet engines are expected to be widely applied to future transportation systems. Due to high-speed flight in the atmosphere, body outer surfaces suffer strong aerodynamic heating, and on the other hand, combustion chamber inter walls are under extremely high temperature and heat flux. Therefore, more efficient and stable active cooling technologies are required in hypersonic vehicles, such as regenerative cooling, film cooling, and transpiration cooling, as well as their combinations. This paper presents a comprehensive literature review on three active cooling methods, i.e., regenerative cooling, film cooling, and transpiration cooling, and deeply analyzes the mechanism of each cooling method, including the fluids flow, heat transfer, and thermal cracking characteristics of different hydrocarbon fuels in regenerative cooling,the heat transfer and flow mechanism of film cooling under supersonic mainstream conditions, and the heat transfer and flow mechanism of transpiration cooling.

关键词： Film cooling Hypersonic vehicle Regenerative cooling Thermal protection Transpiration cooling

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Internal heat transfer coefficients in microporous media with rarefaction effects

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Science China(Technological Sciences) 2012年第10期55卷 2869-2876页

作者： xu ruina HUANG YuLi JIANG Peixue WANG Buxuan Key Laboratory for Thermal Science and Power Engineering of Ministry of Education of China Beijing 100084China Beijing Key Laboratory of CO_(2)Utilization and Reduction Technology Beijing 100084China Department of Thermal Engineering Tsinghua UniversityBeijing 100084China

The internal heat transfer of different gases in microporous media was investigated experimentally and *** experimental test section had a sintered bronze porous media with average particle diameters from 11 μm to 225 μ*** Knudsen numbers at the average inlet and outlet pressures of each test section varied from 0.0006 to 0.13 with porosities from 0.16 to *** particle-to-fluid heat transfer coefficients of air,CO 2 and helium in the microporous media were determined *** results show that the Nusselt numbers for the internal heat transfer in the microporous media decrease with decreasing the particle diameter,d p,and increasing Knudsen number for the same Reynolds *** Kn>0.01,the rarefaction affects the internal heat transfer in the microporous media.A Nusselt number correlation was developed that includes the influence of *** computational fluid dynamics(CFD) numerical simulation was carried out to do the pore scale simulation of internal heat transfer in the microporous media considering the rarefaction *** scale three-dimensional numerical simulations were also used to predict the particle-to-fluid heat transfer *** numerical results without slip-flow and temperature jump effects for Kn<0.01 corresponded well with the experimental *** numerical results with slip-flow and temperature jump effects for 0.01

关键词： internal heat transfer coefficients microporous media rarefaction Knudsen number

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Multi-objective Optimization of Geothermal Extraction from the Enhanced Geothermal System in Qiabuqia Geothermal Field, Gonghe Basin

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Acta Geologica Sinica(English Edition) 2021年第6期95卷 1844-1856页

作者： SONG Guofeng SONG Xianzhi LI Gensheng xu ruina CAO Wenjiong Zhao Chenru State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Key Laboratory for Thermal Science and Power Engineering Ministry of EducationKey Laboratory for CO2 Utilization and Reduction Technology of BeijingDepartment of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Laboratory of Advanced Energy Systems Guangdong Key Laboratory of New and Renewable Energy Research and DevelopmentCAS Key Laboratory of Renewable EnergyGuangzhou Institute of Energy ConversionChinese Academy of Sciences(CAS)Guangzhou 510640GuangdongPR China Institute of Nuclear and New Energy Technology Advanced Nuclear Energy Technology Cooperation Innovation CentreKey Laboratory of Advanced Nuclear Engineering and SafetyMinistry of EducationTsinghua UniversityBeijing 100084China

A geothermal demonstration exploitation area will be established in the Enhanced Geothermal System of the Qiabuqia field, Gonghe Basin, Qinghai–Xizang Plateau in China. Selection of operational parameters for geothermal field extraction is thus of great significance to realize the best production performance. A novel integrated method of finite element and multi-objective optimization has been employed to obtain the optimal scheme for thermal extraction from the Gonghe Basin. A thermal-hydraulic-mechanical coupling model(THM) is established to analyze the thermal performance. From this it has been found that there exists a contraction among different heat extraction indexes. Parametric study indicates that injection mass rate(Q_(in)) is the most sensitive parameter to the heat extraction, followed by well spacing(WS) and injection temperature(T_(in)). The least sensitive parameter is production pressure(p_(out)). The optimal combination of operational parameters acquired is such that(T_(in), p_(out), Q_(in), WS) equals(72.72°C, 30.56 MPa, 18.32 kg/s, 327.82 m). Results indicate that the maximum electrical power is 1.41 MW for the optimal case over 20 years. The thermal break has been relieved and the pressure difference reduced by 8 MPa compared with the base case. The optimal case would extract 50% more energy than that of a previous case and the outcome will provide a remarkable reference for the construction of Gonghe project.

关键词： geothermal energy EGS thermal performance operational parameters multi-objective optimization Gonghe project

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Role of trapped liquid in flow boiling inside micro-porous structures:pore-scale visualization and heat transfer enhancement

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Science Bulletin 2021年第18期66卷 1885-1894,M0004页

作者： Haowei Hu Peixue Jiang Feng Huang ruina xu Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Beijing Key Laboratory of CO_(2) Utilization and Reduction TechnologyDepartment of Energy and Power EngineeringTsinghua UniversityBeijing 100084China

Flow boiling is an important heat dissipation method for cooling high heat flux surfaces in many industrial *** heat transfer can be further enhanced by using porous media surfaces due to their high specific surface ***,although flow boiling in channels is well understood,the phasechange behavior with the additional capillary effect induced by the porous structures is not well understood,and the design of the porous structures is difficult to avoid dryout and over-temperature accidents.A pore-scale lab-on-a-chip method was used here to investigate the flow boiling heat transfer characteristics inside micro-porous *** flow patterns,captured in the two-phase region with a uniform pore-throat size of 30 lm,showed that liquid was trapped in the pore-throat structures as both dispersed liquid bridges and liquid ***,the liquid film was shown to be moving on the wet solid surface by laser-induced fluorescence and particle tracking.A theoretical analysis showed that the capillary pressure difference between adjacent liquid bridges could drive the liquid film flows,which helped maintain the coolant supply in the two-phase *** pore-throat parameters could be designed to enhance the capillary pressure difference with multiple throat sizes of 10–90 lm which would enhance the heat transfer 5%–10%with a 5%–23%pressure drop *** research provides another method for improving the flow boiling heat transfer through the porous structure design besides changing the surface wettability.

关键词： Flow boiling Micro-porous structure Trapped liquid Liquid bridge Film flow Heat transfer enhancement

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超临界CO_2在地下盐水层内弥散现象的数值模拟

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清华大学学报（自然科学版） 2015年第10期55卷 1105-1109,1116页

作者：高诚胥蕊娜姜培学清华大学热能工程系热科学与动力工程教育部重点实验室二氧化碳资源利用与减排技术北京市重点实验室北京100084

在超临界CO2地质封存过程中,CO2在迁移过程中溶于盐水产生密度梯度,从而在盐水层中弥散并沉降,这对于减少盖层承受压力、降低CO2的泄露风险以及提高地下CO2的封存容量具有很重要的意义。该文研究了超临界CO2注入储层多孔结构后CO2在盐... 详细信息

在超临界CO2地质封存过程中,CO2在迁移过程中溶于盐水产生密度梯度,从而在盐水层中弥散并沉降,这对于减少盖层承受压力、降低CO2的泄露风险以及提高地下CO2的封存容量具有很重要的意义。该文研究了超临界CO2注入储层多孔结构后CO2在盐水中的弥散质量随时间的变化规律,分析了CO2地质封存工程应用中的关键参数盐度、温度、压强对一定时间内单位体积盐水层中CO2弥散质量的影响。研究表明:对于渗透率以及颗粒分布状况相同的储层结构,在CO2自由区气相饱和度相同时,盐水层盐度越大,指进现象越不明显,盐水层溶解CO2的质量也越少;盐水层温度越高,指进现象越明显,但是盐水层溶解CO2的质量减小;盐水层的压强越大,指进现象越明显,盐水层溶解CO2质量越大。

关键词：二氧化碳封存指进现象弥散

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致密破碎多孔介质渗透率测量方法

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化工学报 2014年第S1期65卷 353-358页

作者：周博胥蕊娜姜培学热科学与动力工程教育部重点实验室北京市二氧化碳资源利用与减排技术重点实验室清华大学热能工程系北京100084

基于均匀各向同性多孔介质、达西渗流和理想气体假设,考虑Klinkenberg效应建立了针对具有纳米尺度孔径的低渗透率多孔介质中的渗流模型。针对致密球形破碎样品的压力脉冲实验,建立了相应的边界条件,同时利用有限差分方法获得其实验腔的... 详细信息

基于均匀各向同性多孔介质、达西渗流和理想气体假设,考虑Klinkenberg效应建立了针对具有纳米尺度孔径的低渗透率多孔介质中的渗流模型。针对致密球形破碎样品的压力脉冲实验,建立了相应的边界条件,同时利用有限差分方法获得其实验腔的压力变化曲线的数值解。通过对渗流方程进行量纲1化,引入了与孔隙率、渗透率和滑移参数有关的量纲1参数Z、Z*和bK。通过改变参数Z、Z*和bK研究了样品边界处压力的变化规律,给出了一种数据处理方法,对于致密球形破碎多孔介质的压力脉冲实验,通过对实验测量的样品边界处压力曲线的分析,结合偏微分方程正问题的数值解,可以确定样品的孔隙率、渗透率和滑移参数,从而更为简便地分析压力脉冲衰减曲线实验数据,得到致密多孔介质样品渗透率。

关键词：渗透率多孔介质 Klinkenberg滑移数值模拟压力脉冲

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纳米受限效应下流体自扩散机理及规律研究

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工程热物理学报 2024年第3期45卷 778-784页

作者：曾克成姜培学胥蕊娜热科学与动力工程教育部重点实验室清华大学能源与动力工程系北京100084

当固体壁面间距仅有几个纳米时,纳米受限效应使得流体自扩散系数降低12个数量级,孔径、温度和压力的影响显著且复杂。分析受限流体扩散机理和规律,建立简洁的关联式具有重要意义。本研究从分子模拟出发,经过仔细计算和分析,获得了大量... 详细信息

当固体壁面间距仅有几个纳米时,纳米受限效应使得流体自扩散系数降低12个数量级,孔径、温度和压力的影响显著且复杂。分析受限流体扩散机理和规律,建立简洁的关联式具有重要意义。本研究从分子模拟出发,经过仔细计算和分析,获得了大量纳米孔隙中流体自扩散系数数据。分析了壁面吸附作用对流体扩散的影响机理和规律,提出了可简单描述流体扩散行为的无量纲扩散系数,从而与努森数建立相应关联式,具有较强的适用性。

关键词：纳米受限流体扩散分子动力学

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