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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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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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Experimental research on the characteristics of steam-water counter-current flow in the Pressurizer Surge Line assembly

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Experimental Thermal and Fluid Science 2018年 96卷 180-191页

作者： Jiangtao Yu Dalin Zhang Leitai Shi Zhiwei Wang Wenxi Tian G.H. Su S.Z. Qiu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University 28 Xianning West Road Xi’an 710049 China Shaanxi Key Lab. of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University 28 Xianning West Road Xi’an 710049 China

To investigate Counter-Current flow (CCF) characteristics in the Pressurizer Surge Line (PZR SL) assembly of the large advanced passive nuclear reactors, steam-water CCF experiments are carried out on a stainless steel test section, which is a 1:4 scaled-down model of the AP1000 PZR SL assembly. The inner diameter of the test PZR SL pipe is 90 mm, which also belongs to the large-diameter pipes, as same as the prototype PZR SL pipe, in the field of Counter-Current flow Limitation (CCFL) researches. The present steam-water CCFL experiments are conducted under normal pressure and saturated temperature, with the PZR simulator collapse water level ranging from 350 to 900 mm. CCFL becomes severer at higher steam flow rate, and the most limiting CCFL effect locates between the PZR simulator bottom head and the vertical part of PZR SL pipe. The onset of CCFL and zero liquid penetration (ZP) are two critical conditions in the CCF development process, dividing the process into three stages: Before-CCFL, Partial-CCFL, and CCFL-ZP. According to the local CCFL conditions, the development of the CCFL process is also divided into four-regions since onset of CCFL. The present steam-water CCF data are well normalized in terms of dimensionless Kutateladze (Ku) numbers, and a Ku-type empirical partial CCFL correlation is developed. The comparisons of the present CCF data and partial CCFL correlation with the CCF data and correlations of former experiment researches validate that the present empirical partial CCFL correlation is conservative to predict steam-water partial CCFL in the prototype PZR SL assembly of the large advanced passive nuclear reactors.

关键词： Steam-water counter-current flow Partial CCFL correlation Pressurizer surge line assembly Advanced passive nuclear reactors ADS Automatic Depressurization System ADS1-3 First to Third Stages of ADS ADS4 Fourth Stage of ADS CCF Counter-Current flow CCFL Counter-Current flow Limitation CCFL-1 The 1st grade of CCFL region CCFL-2 The 2nd grade of CCFL region CCFL-3 The 3rd grade of CCFL region CCFL-L Local CCFL at the T-junction of HL pipe and PZR SL pipe CCFL-S Local CCFL along the PZR SL pipe CCFL-U Local CCFL at the location between the PZR simulator bottom head and vertical part of PZR SL pipe CCFL-ZP Zero liquid penetration region or stage CMT Core Makeup Tank COCF Co-Current flow HL Hot Leg IRWST In-containment Refueling Water Storage Tank Ku Kutateladze PRHR Passive Containment Cooling System PWRs Pressurized Water Reactors PZR SL Pressurizer Surge Line RC Reactor Core RCS Reactor Coolant System RPV Reactor Pressure Vessel SBLOCAs Small-Break Loss-of-Coolant Accidents ZP zero liquid penetration

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Numerical study on the laminar flame characteristics of acetylene-methanol blends 11

Numerical study on the laminar flame characteristics of acet...

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11th Asia-Pacific Conference on Combustion, ASPACC 2017

作者： Li, Qianqian Zhang, Yemiao Zhang, Yingjia Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No. 28th Xianning West Road Xi’anShaanxi710049 China

Laminar flame characteristics of the blends of acetylene and methanol were numerically studied at 0.1 MPa and 363 K. A model was adopted to do the simulations with the accuracy validated with published laminar flame speeds data of methanol and acetylene. Simulation results showed that the methanol addition into acetylene leads to the significant increase of laminar flame speed with the equivalence ratio corresponding the maximum value shifting to the rich side. The reasons behind were analyzed and found the thermal and chemical kinetic effects both contribute the laminar flame speed variation while the contribution of the diffusion effect can be ignored. Besides, the equivalence ratio shift is found to be closely related to the adiabatic temperature and OH concentrations.

关键词： Acetylene

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Sand particle lift-off velocity measurements and numerical simulation of mass flux distributions in a wind tunnel

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Journal of Arid Land 2017年第3期9卷 331-344页

作者： XIAO Fengjun DONG Zhibao GUO Liejin WANG Yueshe LI Debiao National Demonstration Center for Experimental Geography Education College of Tourism and Environment Shaanxi Normal University Xi'an 710119 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Xi'an Special Equipment Inspection Institute Xi'an 710065 China

Lift-off velocity of saltating sand particles in wind-blown sand located at 1.0 mm above the sand bed surface was measured using a phase Doppler particle analyzer in a wind tunnel. The results show that the probability distribution of lift-off velocity can be expressed as a lognormal function, while that of lift-off angle follows an exponential function. The probability distribution of lift-off angle conditioned for each lift-off velocity also follows an exponential function, with a slope that becomes steeper with increasing lift-off velocity. This implies that the probability distribution of lift-off velocity is strongly dependent on the lift-off angle. However, these lift-off parameters are generally treated as an independent joint probability distribution in the literature. Numerical simulations were carried out to investigate the effects of conditional versus independent joint probability distributions on the vertical sand mass flux distribution. The simulation results derived from the conditional joint probability distribution agree much better with experimental data than those from the independent ones. Thus, it is better to describe the lift-off velocity of saltating sand particles using the conditional joint probability distribution. These results improve our understanding of saltation processes in wind-blown sand.

关键词： lift-off velocity lift-off angle joint probability distribution sand mass flux saltation

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Cover Feature: Coupling Photothermal Effect into Efficient Photocatalytic H2Production by Using a Plate-like Cu@Ni Core-shell Cocatalyst (ChemCatChem 10/2020)

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ChemCatChem 2020年第10期12卷 2648-2648页

作者： Xinyang Guo Dr. Fei Xue Shikai Xu Prof. Shaohua Shen Prof. Hongwen Huang Prof. Maochang Liu International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 P.R. China Suzhou Academy of Xi'an Jiaotong University Suzhou Jiangsu 215123 P.R. China College of Materials Science and Engineering Hunan University Changsha Hunan 410082 P.R. China

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Study of an inter-wrapper flow model and effects in sodium-cooled fast reactor

Study of an inter-wrapper flow model and effects in sodium-c...

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2017 Transactions of the American Nuclear Society, ANS 2017

作者： Zhang, Dalin Song, Ping Wang, Shibao Wang, Xin'an Chen, Jing Yue, Nina Tian, Wenxi Qiu, Suizheng Su, G.H. School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No.28 Xianning West Road Xi'an710049 China

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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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