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Integration of Organic Rankine Cycle with Lignite Flue Gas Pre-drying for Waste Heat and Water Recovery from Dryer Exhaust Gas: Thermodynamic and Economic Analysis

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Energy Procedia 2017年 105卷 1614-1621页

作者： Xiaoqu Han Sotirios Karellas Ming Liu Konstantinos Braimakis Weixiong Chen Junjie Yan Emmanuel Kakaras State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China Laboratory of Steam Boilers and Thermal Plants National Technical University of Athens Athens 15780 Greece

The flue gas pre-drying of lignite produces a moisture rich dryer exhaust gas which can be further cooled to recover the waste heat and water vapor. An environmental friendly power system is investigated in the present work, which integrates the lignite flue gas pre-drying system with an organic Rankine cycle (ORC) to utilize the waste heat to generate power and capture the condensed water. Simulation models of the integrated system are developed, incorporating thermodynamic and economic evaluation indicators. The optimal energy and exergy efficiencies of the ORC system are calculated to be 3.10% and 24.57%, respectively, for an evaporation temperature of 51 °C when R245fa is used as the working fluid. Accordingly, the ORC power output is 3.61 MW and the absolute plant efficiency improvement is 0.27% points. Moreover, 55.17% of the water vapor can be recovered. The economic performance significantly relies on the specific investment cost of ORC and the electricity selling price. Typically, the break-even points of the specific investment cost are 2300 €/kW and 3700 €/kW when electricity selling prices are 0.05 €/kWh and 0.08 €/kWh, respectively.

关键词： Lignite Flue gas pre-drying Waste heat recovery Organic Rankine cycle

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Gas and Liquid flow Rate Measurement in Wet Gas Based on Differential Pressure Signals

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Jixie Gongcheng Xuebao/Journal of Mechanical engineering 2017年第24期53卷 55-62页

作者： Bai, Bofeng Zheng, Xuebo Qiu, Lu State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Scientific Information Division Xinjiang Oilfield Company Karamay834000 China

The basic characteristics of differential pressure signals and the limitation of flow rate metering methods based on differential pressure are studied analytically and experimentally. Through the investigation into differential pressure signals of orifice plate and V-cone, it is found that the two-phase differential pressure is mainly caused by gas phase and is slightly affected by the liquid phase. In the case of low liquid hold up, the frictional pressure drop can be decreased due to the presence of the thin liquid film on the wall, resulting in that the two-phase differential pressure, pressure loss and pressure loss ratio decrease at first and then increase as the liquid hold up increases. The fluctuation of the differential pressure is stochastic, causing the fluctuation characteristic parameters, such as the standard deviation, having the properties of poor stability and repeatability. This makes it difficult to be applied to industrial wet gas metering. The error propagation analysis demonstrates that the prediction error of liquid phase flow rate is much larger than that of the gas phase, which is a universal phenomenon of metering methods based on over-reading correlations. Finally, we recommend that for wet gas with high gas void fraction, the liquid flow rate should be measured independently. The non-monotonicity of the pressure loss ratio needs to be concerned if it is chosen as the characteristic parameter. Parameters with poor repeatability, such as standard deviation, are not recommended for wet gas metering. © 2017 Journal of Mechanical engineering.

关键词： flow rate

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Correlations of Coal Chemical Properties in China: Quantitative Analysis from Thousands of Data

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Energy Procedia 2017年 105卷 1339-1343页

作者： Chang’an Wang Song Wu Wufeng Chen Qiang Lv Defu Che State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University No 28 Xianning West Road Xi’an 710049 China

Coal chemical properties show conspicuous impacts on its reactivity and thermal conversion. Nevertheless, the quantitative analysis of coal property indice in China is insufficient. Here, we quantitatively analyzed the correlations of various chemical properties of coals from thousands of data. Noteworthy variations were captured with some quantified expressions between coal properties obtained.

关键词： coal property quantitative analysis fuel ratio coal rank energy conversion fossil fuel

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Lithium–Sulfur Batteries: Flexible and High‐Loading Lithium–Sulfur Batteries Enabled by Integrated Three‐In‐One Fibrous Membranes (Adv. Energy Mater. 38/2019)

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Advanced Energy Materials 2019年第38期9卷

作者： Jianan Wang Guorui Yang Jie Chen Yunpeng Liu Yuankun Wang Cheng‐Yen Lao Kai Xi Duowen Yang Christopher J. Harris Wei Yan Shujiang Ding Ramachandran Vasant Kumar Department of Applied Chemistry School of Science MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter State Key Laboratory for Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China Department of Environmental Science and Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Materials Science and Metallurgy University of Cambridge Cambridge CB3 0FS UK

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Computational fluid dynamics simulation of hydrodynamics in the riser of an external loop airlift reactor

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Particuology 2016年第4期14卷 95-101页

作者： Xuedong Jiang Ning Yang Bolun Yang Department of Chemical Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Center for Mesoscience and State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China

Local hydrodynamics in the riser of an external loop airlift reactor （EL-ALR） are identified and the performances of three drag models are evaluated in computational fluid dynamics simulation. The simulation results show that the Schiller-Naumann drag model underestimated the local gas holdup at lower superficial gas velocity whereas the Tomiyama drag model overestimated that at higher superficial gas velocity. By contrast, the dual-bubble-size （DBS）-local drag model gave more reasonable radial and axial distri-butions of gas holdup in all cases. The reason is that the DBS-local drag model gave correct values of the lumped parameter, i,e., the ratio of the drag coefficient to bubble diameter, for varying operating conditions and radial positions. This ratio is reasonably expected to decrease with increasing superficial gas velocity and be smaller in the center and larger near the wall. Only the DBS-local drag model correctly reproduced these trends. The radial profiles of the axial velocity of the liquid and gas predicted by the DBS-local model also agreed well with experimental data.

关键词： Computational fluid dynamics External loop airlift reactor Drag model Gas holdup Mnltiscale Mesoscale

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An overview of photocatalytic materials

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Journal of Materiomics 2017年第1期3卷 1-2页

作者： Shaohua Shen Coleman Kronawitter George Kiriakidis International Research Centre for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityShaanxi 710049China Department of Chemical Engineering University of CaliforniaDavisDavisCA 95616USA Institute of Electronic Structure and Laser Foundation for Research and Technology HellasP.O.Box 152771110 HeraklionGreece

Photocatalysis is an emerging technology that enables a wide variety of applications,including degradation of organics and dyes,antibacterial action,and fuel generation through water splitting and carbon dioxide *** inorganic semiconducting materials have been explored as photocatalysts,and the versatility of these materials and reactions has been expanded in recent *** the relationship between the physicochemical properties of photocatalytic materials and their performances as well as the fundamentals in catalytic processes is important to design and synthesis of photocatalytic materials.

关键词： materials. reduction. photocatalytic

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Effects of Coal Blending and Operating Conditions on Combustion and NO x Emission Characteristics in a Tangentially-fired Utility Boiler

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Energy Procedia 2017年 105卷 4015-4020页

作者： Debo Li Qiang Lv Yongxin Feng Chang’an Wang Xuan Liu Kai Chen Kai Xu Jun Zhong Defu Che Electric Power Research Institute of Guangdong Power Grid Corporation Guangzhou 510080 China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an 710049 China

The influences of operating conditions, such as excess air ratio and SOFA arrangement, on temperature distributions, species distributions, NO x emissions and burnout of a tangentially-fired utility boiler using bituminous and blended coal were investigated by numerical approach in the present study. The simulation results show that the fuel type exhibits certain effect on the temperature distributions and the NO x emissions. Moreover, higher excess air ratio could restrain the CO formation but promote NO x emission. The temperature and the species distributions are highly related to the SOFA arrangement. In addition, SOFA technology is still an effective approach to control the NO x emissions during blended coal combustion, while the disadvantageous effect on char burnout should be considered.

关键词： coal blending combustion NOx emission numerical simulation utility boiler

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Numerical Study on Combustion and Heat Transfer Properties Under Oxy-fuel Condition in a 600MW Utility Boiler

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Energy Procedia 2017年 105卷 4009-4014页

作者： Debo Li Xuan Liu Chang’an Wang Kai Xu Qiongliang Zha Qiang Lv Yongxin Feng Jun Zhong Defu Che Electric Power Research Institute of Guangdong Power Grid Corporation Guangzhou 510080 China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an 710049 China

Oxy-fuel combustion is recognized as one of the most promising CO 2 capture technologies. Under oxy-fuel combustion, the concentrations of CO 2 and H 2 O are much higher, result in different temperature profiles and heat transfer properties. In this study, a modified computational fluid dynamics (CFD) model-was developed for a 600 MW tangentially-fired boiler. Different oxygen volume fractions and two flue gas recycle modes (dry recycle and wet recycle) were numerically investigated, focusing on the properties of combustion and heat transfer. The results indicate the peak temperature in the burner zone decreases in oxy-fuel combustion, because of the high heat capacity and chemical reactivity of CO 2 . Compared with air-fired combustion, similar total heat transfer rate in furnace can be achieved at 27.0% and 28.3% of oxygen volume fraction for wet and dry recycle. These findings indicate retrofitting an existing boiler with oxy-fuel combustion technology is entirely feasible.

关键词： oxy-fuel combustion WSGGM numerical simulation combustion properties heat transfer properties

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Sodium-Ion Batteries: In Situ Fabrication of Branched TiO2/C Nanofibers as Binder-Free and Free-Standing Anodes for High-Performance Sodium-Ion Batteries (Small 30/2019)

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Small 2019年第30期15卷

作者： Ling Wang Guorui Yang Jianan Wang Silan Wang Caiyun Wang Shengjie Peng Wei Yan Seeram Ramakrishna Department of Environmental Science & Engineering State Key of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong New South Wales 2522 Australia Department of Mechanical Engineering National University of Singapore Singapore 117574 Singapore

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Investigation on Correlations between Chemical Properties of High-alkali Solid Fuels

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Energy Procedia 2017年 142卷 1040-1044页

作者： Chang’an Wang Xin Zhu Jun Song Xuan Liu Qiang Lv Defu Che State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an 710049 China Ningxia Electric Power Research Institute Yinchuan 750002 China

The ash-related issues due to the high-alkali characteristic are still unresolved during utilization of biomass and Zhundong coal. Here, the correlations of several chemical properties of high-alkali solid fuels were investigated. The distributions of ash compositions in various biomass exhibit obvious diversity, while the distribution of K 2 O content within wheat and corn straws are the most scattered. The ash content in biomass shows a decrease tendency with the increase of carbon content. Zhundong coals generally have medium but close ash fusion points despite of quite different ash compositions sometimes.

关键词： high alkali chemical property Zhundong coal biomass ternary distribution

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