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Theoretical investigation on heat-electricity decoupling technology of low-pressure steam turbine renovation for CHPs

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IOP Conference Series: Earth and Environmental Science 2019年第4期227卷

作者： Qingbo Hu Kun Wang Li Zhang Liansheng Zhou Rong Chen Shan Wang Yu Zhang Guohao Li Tianjin Electric Power Science & Research Institute Tianjin 300384 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiao Tong University Xi'an 710049.

The power grid peaking capacity is insufficient due to the increasing installed capacity of renewable power. Moreover, it is also restricted by the operation mode of combined heat and power units (CHPs), the minimum electricity loads of which are determined by the heat load. It is significant to study the heat-electricity decoupling technologies for CHPs. Therefore, the low-pressure steam turbine renovation technology is studied in this paper with a 300MW unit as reference case. Results show that the minimum electric load rate and the coal consumption are decreased, and the heat-electricity ratio is increased significantly for CHP with low-pressure steam turbine renovation. When the heat load is 1200 GJ/h, the minimum electric load rate and coal consumption with low-pressure steam turbine renovation can be reduced by 32.4 and 30.9 % respectively. The heat-electricity ratio can be increased by 68.8 % after renovation of low-pressure steam turbine.

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Pressure drop of single/two-phase flows through porous bed with sand particles 17

Pressure drop of single/two-phase flows through porous bed w...

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17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2017

作者： Li, Liangxing Kong, Liubo Wang, Huasheng Zou, Xumao Lei, Xianliang Li, Huixiong State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xian-ning West Road 28# Xi’an city710049 China

Motivated by reducing the uncertainties in quantification of debris bed coolability in a severe accident of light water reactors (LWRs), this paper reports experimental studies on the pressure drops of single /two phase flows through packed porous beds with sand particles. A test facility named DEBECO-LT is constructed to investigate the friction laws of adiabatic single and two-phase flow through a particulate bed. From the single flow test, the effective diameter of bed with sands particles can be derived from the measured pressure drops and the Ergun equation. Based on this effective diameter, two phase flow tests are performed and the prediction models are verified by comparing the measured data and the calculations with different analysis models. The results show that in the case of beds with smaller sands particles, the measured pressure drops show gradual increasing tendency with fluid flowrate, and the predictions of Reed model are closer to the measured two-phase flow pressure drop at higher flowrates. For the packed beds with coarse sands particles, the pressure drops would show descent-ascent tendency and there were hardly any models predicting well the measured pressure drop. There is a clear need to develop an accurate analysis models for the bed with coarse particles. © 2016 Association for Computing Machinery Inc. All Rights Reserved.

关键词： Pressure drop

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Corrigendum to “Promoting adiabatic core approximation in a rapid compression machine by an optimized creviced piston design” [Fuel 251 (2019) 328–340]

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Fuel 2019年 255卷

作者： Yingtao Wu Meng Yang Chenglong Tang Yang Liu Peng Zhang Zuohua Huang State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China Department of Mechanical Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong

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Synthesis of texture-excellent mesoporous alumina using PEG1000 as structure-directing agent

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Chinese Journal of Chemical engineering 2017年第1期25卷 137-141页

作者： Kui Zhang Changming Li Jian Yu Shiqiu Gao Guangwen Xu State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

By varying concentration of PEG1000 as a structure-directing agent,mesoporous alumina with excellent textural properties was *** prepared mesoporous alumina displays high thermal stability,as shown by its textural properties at different calcination temperatures of 600-850 °*** by SEM and TEM revealed that the added PEG surfactant induced the formation of petal-like *** results clarified that all samples were amorphous and their peaks were around the peaks of γ-alumina.N_2 adsorption-desorption analysis showed that the prepared mesoporous alumina,if with PEG1000 in hydrolysis of aluminum isopropoxide,had excellent textural properties with large specific surface area,high pore volume and suitable pore *** petal-like structure existing in the alumina samples improved their textural parameters,and the role and influential mechanism of PEG1000 were analyzed.

关键词： Alumina PEG1000 Surfactant Stability

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Effects of water content on the dissolution behavior of wool keratin using 1-ethyl-3-methylimidazolium dimethylphosphate

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Science China Chemistry 2017年第7期60卷 934-941页

作者： Zhenlei Zhang Xiaochun Zhang Yi Nie Hui Wang Shuangshuang Zheng Suojiang Zhang Key Laboratory of Green Process and Engineering Beijing Key Laboratory of lonic Liquids Clean ProcessState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemistry and Chemical Engineering University of Chinese Academy of SciencesBeijing 1000491 China Zhengzhou Institute of Emerging Technology Industries Zhengzhou 450000China

Ionic liquids(ILs) are eco-friend and recyclable solvents for dissolution of wool keratin, and water is often used as antisolvent to regenerate keratin from IL solution. To recycle the ILs, removing water is the necessary step. However, complete removal of the water is energy-intensive and costly. The water in ionic liquids would change the physicochemical properties and cluster structures of the IL and further affect its dissolution behavior on keratin. Here, 1-ethyl-3-methylimidazolium dimethylphosphate([Emim]DMP) was used for experiments due to its good performance on dissolving keratin. The experimental and simulation results showed that the dissolving capability of [Emim]DMP was decreased and the interactions between cation and anion became weaker with water concentration increasing. Furthermore, the dissolution time of wool keratin in [Emim]DMP increased with water content rising. At the same time, the effect of water in ILs on the secondary structure distribution and thermal stability of regenerated keratin was not obvious. In this work, by taking the structures of [Emim]DMP, keratin dissolution time and properties of the regenerated keratin into consideration, a balanced range of water content in [Emim]DMP was determined, which could not only reduce recycling cost but also not affect the dissolution behavior of the IL.

关键词： keratin ionic liquids water recycle

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Deformation and Motion of Compound Droplet Adhering to Wall

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2017年第12期38卷 2636-2640页

作者： Shang, Xing-Long Bai, Bo-Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The compound droplet will exhibits much more complex behavior when it adheres to a wall under flow. Studying the influence of related parameter plays an important role in the manipulation of the compound droplet. In this paper, a three-dimensional numerical method involving the moving contact line problem is developed by integrating the generalized Navier boundary condition into the front-tracking method. The proposed method is applied to study the effects of the capillary number of inner and outer interface and the volume of inner droplet on the deformation and motion of the compound droplet adhering to the wall with considering the contact angle hysteresis effect. It found that the compound droplet is more like to be detached or pinched-off by the flow when the capillary number of outer interface and the volume of inner droplet are large and the capillary number of inner interface is small. key words © 2017, Science Press. All right reserved.

关键词： Deformation

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Effects of Fluid Inertia on Adhesion Behaviors of Elastic Capsules

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2017年第4期38卷 776-780页

作者： Luo, Zheng-Yuan Bai, Bo-Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Elastic capsules (consisting of viscous fluid enclosed by elastic membranes) can form specific adhesion bonds with functionalized surface. Adhesion force in these bonds and viscous and inertial force in fluids determine adhesive dynamics of capsules under flow. In this paper, based on the front-tracking finite-element method we developed previously, we further combine the kinetic adhesion dynamics model and develop a three-dimensional model for adhesive dynamics of capsules, in which membrane elasticity, fluid inertia and viscosity can be considered simultaneously. The effects of fluid inertia on adhesive characteristics of capsules are investigated systematically. Results show that fluid inertia induces the increase of both drag and lift forces from the surrounding fluid. As a consequent, the detachment of the elastic capsule is promoted by fluid inertia. © 2017, Science Press. All right reserved.

关键词： Dynamics

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On the effects of shear and compositional inhomogeneities in turbulent, lean, premixed flames 11

On the effects of shear and compositional inhomogeneities in...

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11th Asia-Pacific Conference on Combustion, ASPACC 2017

作者： Steinmetz, S.A. Juddoo, M. Jin, W. Masri, A.R. School of Aerospace Mechanical and Mechatronic Engineering University of Sydney NSW2006 Australia State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xian710049 China

This paper presents some initial results on the separate effects of shear and compositional inhomogeneities on the global structure of turbulent lean piloted premixed flames. Shear is introduced by injecting the mixture in two streams through two concentric tubes at different velocities. Compositional inhomogeneity, for the same shear rate, is obtained by injecting air in the annulus and fuel or rich fuel-air mixtures through the inner jet which may be recessed upstream of the jet exit plane. It is found that increasing the shear inhomogeneity can lead to a shorter flame where the tip may transition from "open" to "closed". The latter refers to a "Bunsen-like" flame while an "open" flame has reacting edges that do not close at the tip. Compositional inhomogeneity seems to have little effects on the global structure despite the presence of mixture fraction gradients a noted from Rayleigh scattering performed the jet exit plane. Measurements of velocity fields and imaging of reaction zones will be performed to enable a better understanding of the structure of these flames and to locate them on the premixed flames regime diagram. © 2018 Combustion Institute. All Rights Reserved.

关键词： Mixtures

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Dynamic Pore-Scale Dissolution by CO2-Saturated Brine in Carbonates: Impact of Homogeneous Versus Fractured Versus Vuggy Pore Structure

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Water Resources Research 2020年第4期56卷 e2019WR026112-e2019WR026112页

作者： Yongfei Yang Yingwen Li Jun Yao Stefan Iglauer Linda Luquot Kai Zhang Hai Sun Lei Zhang Wenhui Song Zhiyu Wang Key Laboratory of Unconventional Oil and Gas Development China University of Petroleum (East China) Ministry of Education Qingdao China Research Center of Multiphase Flow in Porous Media School of Petroleum Engineering China University of Petroleum (East China) Qingdao China School of Engineering Petroleum Engineering Discipline Edith Cowan University Joondalup Western Australia Australia Université Montpellier CNRS Geosciences Montpellier Laboratory Montpellier France

Limestone pore structure strongly influences dissolution and associated reactive transport. These effects are critical in limestone diagenesis and but also in engineering operations such as carbon capture and storage (CCS). However, detailed studies on how CO 2 -enriched (acidic) brine changes this pore structure at relevant reservoir storage conditions are very limited. Thus, to provide further quantitative information and more fundamental understanding about these key processes, we studied the dissolution patterns of a homogeneous, a fractured, and a vuggy limestone when flooded with CO 2 -saturated brine at representative storage conditions. The pore structured of these limestones showed drastically different responses to the acidic brine flood. As such, preferential channels surrounded by branched channels were formed in the homogeneous sample, while fractures became the main flow path in the fractured sample. In contrast, only one dominant channel formed in the vuggy sample, which resulted in a sharp permeability increase. These dissolution patterns reflect the associated Damköhler number, which significantly lower in the homogeneous, representing uniform dissolution. However, after injecting sufficient reactive fluid (1,000 PV), this uniform dissolution pattern transformed into a single preferential channel growth. Moreover, we conclude that increasing complexity of the pore geometry leads to more nonuniform dissolution. These dissolution patterns indicate the effect of initial pore structure on preferential channel growth and reaction transport. Our work provides key fundamental data for further quantifying limestone dissolution patterns in CCS, indicating that the CO 2 injection may cause the reactivation of geological faults and damage around wellbore, thus aids in the implementation of industrial-scale CCS. The impact of limestone pore structure on reactive transport was analyzed experimentally and computationally The dissolution patterns of homogeneous, f

关键词： Carbonate dissolution pattern Carbon storage Pore-scale Micro-CT Permeability changes Pe -Da distribution

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Lattice Boltzmann model for simulation on leaching process of weathered elution-deposited rare earth ore

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Journal of Rare Earths 2017年第10期35卷 1014-1021页

作者：邱廷省朱冬梅吴承优王利民 School of Resource and Environmental Engineering Jiangxi University of Science and Technology State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Changsha Research Institute of Mining and Metallurgy Co. Ltd

The lattice Boltzmann model with coupled chemical reaction was proposed to simulate the ion exchange process of rare earth leaching and verified by comparison with both empirical correlation of mass transfer coefficient and unreacted-core shrinking model. By simulation, the zonation phenomenon of leaching reagent in the leaching column was presented, and the breakthrough curve of leaching reagent was obtained. When t=50 s, there existed the saturated and exchange zones, and the leaching reagent concentration decreased gradually from 20 to 9.3 g/L. In accordance with the breakthrough curve, the breakthrough capacity of ion-type rare earth ore and the adsorbed ion concentration of leaching reagent were derived, the time of t=25 s was the breakthrough point of ammonium ion in leaching reagent and the breakthrough capacity of the rare earth ore was 125 g/L. Besides, the chemical kinetics parameters used for the solute transfer process of rare earth leaching were obtained by the simulation and then were used to determine the rate-limiting steps of rare earth leaching process.

关键词： lattice Boltzmann model rare earth leaching ion exchange simulation solute transfer

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