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4th International Conference on Information Science, Parallel and Distributed Systems, ISPDS 2023

作者： Wang, Weibin Wei, Xutao Xi'an Fanyi University Department of Computer Science Xi'an China Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an China

ISBN: (纸本)9798350337181

The numerical simulation of the turbulent combustion is identified as one of the most promising methods on the designs of the combustion devices, for example: the internal combustion engine and gas turbine. This mainly depends on the development of parallel computing technique. However, the computational efficiency for different cases on different compute nodes and number of cores still needs to be studied. On the other hand, due to the requirements from the aim of peaking carbon dioxide emissions before 2030 and achieving carbon neutrality before 2060, modern energy system is requesting low carbon or carbon free fuels, such as ammonia (NH3). Therefore, the simulations of ammonia/air flame were performed in present investigation. The comparison between simulation cases on different compute nodes and number of cores illustrates that different cases requires different number of cores to achieve the best computational efficiency. The computational efficiency of each compute nodes are dissimilar, which can decrease the efficiency. Meanwhile, the methods in present study can predict the ammonia/air flames. The initial condition of velocity fluctuation is necessary for simulating turbulent flame. The wrinkles of the flames can be well predicted by the velocity fluctuation initial boundary condition. © 2023 IEEE.

关键词： Computational efficiency

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Simulation Investigation on NOx Emission Characteristics and Mechanisms During Co-combustion of Fossil Fuels with Different Fuel-Nitrogen Distributions via CHEMKIN 9th

Simulation Investigation on NOx Emission Characteristics and...

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9th International Symposium on Coal Combustion, ISCC 2019

作者： Wang, Chaowei Wang, Chang’an Zhao, Lin Yuan, Maobo Wang, Pengqian Du, Yongbo Che, Defu State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an710049 China

ISBN: (纸本)9789811616563

There are over 100 million tons of semi-coke produced in China every year, and use of the semi-coke in utility coal-fired boilers is a promising approach. In this paper, a blending model of semi-coke and bituminous coal was established via CHEMKIN. The NOx emission was investigated by analyses of sensitivity and production rate, while the effects of stoichiometric ratio of main combustion zone, blending ratio, and combustion temperature on migration of fuel nitrogen were further elucidated. The simulation results showed that the conversion ratio of NOx increased monotonically with an increase in the stoichiometric ratio of main combustion zone. The temperature of plug flow reactor (PFR) I exhibited a significant effect on NOx emission, but other reactors had limited influences. The NOx conversion ratio was enlarged with the increase of semi-coke blending ratio. The influence of blending proportion on NOx emission was significant when the stoichiometric ratio of main combustion zone was small. Compared with high blending ratio, the main reactions with low blending ratio had stronger inhibitory effect on the formation of NO. The present study was of guiding significance for reducing NOx emission in the utility boilers co-firing semi-coke. © 2022, Tsinghua University Press.

关键词： Sensitivity analysis

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Sustainability Assessment of Typical Energy Storage Technologies for Peak Shaving Scenarios Based on the Full Life Cycle 36

Sustainability Assessment of Typical Energy Storage Technolo...

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36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2023

作者： Chen, Nana Han, Xiaoqu Li, Yanxin Huang, Xiaofan Li, Jiarui Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Huadian Electric Power Research Institute Co. Ltd. Beijing China

ISBN: (纸本)9781713874928

With more renewable energy sources (RES) which are inherent intermittent and unpredictable connecting with power grid, various stability problems occur, among which the peak load regulation is the most prominent. Energy storage systems (ESSs) are essential for buffering the electricity grid. Selecting the most suitable energy storage technology among various alternatives is of great importance. In this work, the sustainability of typical energy storage technologies was studied with respect to four aspects for peak shaving scenarios, including technical (i.e. maturity, energy density, round-trip efficiency, duration ranges, life cycles, lifetime and position flexibility), economic (levelized cost of energy, net present value), environmental (i.e. global warming, damage to human health, damage to ecosystems, damage to resource availability) and social (public acceptance) based on the full life cycle. This study evaluated the soft criteria including maturity, position flexibility and public acceptance by Analytic hierarchy process (AHP). Life cycle assessment (LCA) and life cycle cost (LCC) methods were combined to study the life-cycle environmental and economic performance. Technique for order preference by similarity to an ideal solution (TOPSIS) was applied for determining the sustainability prioritization of energy storage technologies. The sensitivity analysis was carried out to investigate the effects of control and economic input parameters on environmental performance and economic performance. In addition, the effects of criteria weights, electricity sources and number of daily cycles were conducted on sustainability ranking of ESSs. The results showed Lithium iron phosphate battery (LIPB) and pumped hydro storage (PHS) had good sustainability performance, which could be the most suitable energy storage technologies for peak shaving scenarios. © (2023) by ECOS 2023 All rights reserved.

关键词： Life cycle

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Experimental Study on Non-Isothermal Mixing Characteristics of Water in T-Junction

Experimental Study on Non-Isothermal Mixing Characteristics ...

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2024 Academic Conference of China Instrument and Control Society, ACCIS 2024

作者： Liu, Shuhan Guo, Wencang Lei, Xianliang Yuan, Zhaojun Meng, Shuqi Jin, Desheng Xi'an Jiaotong University State Key Laboratory of Multiphase Flow Engineering Xian China China Nuclear Power Technology Research Institute Co. Ltd. Shen Zhen Guangdong China

ISBN: (纸本)9798350350326

T-junction is an essential component in piping system of various thermal systems. When hot and cold fluid mixing in the T-junction, several compound mechanisms (like turbulent mixing, turbulent penetration, fluid stratification) make the mixing characteristics more complex. To clearly reveal such mixing mechanism with non-isothermal fluids, an experimental study was conducted with Ultrasound Doppler Velocimetry (UDV) and fast-response thermocouples bundle. The results show that the local velocity uncertainty of the UDV is within 10%, the uncertainty of the thermocouple bundle is 0.5°C, and the response time is 66.7 ms. After verification, the mixing characteristics between the main and branch pipe under different momentum ratios and temperature differences were discussed. It is shown that as the momentum ratio decreases, the location of the most intense radial temperature fluctuations and velocity fluctuations shifts towards the lower wall. At the same time, the peak flow rate in the cross-section increases by 35.7% and the main branch fluid mixing is more homogeneous. As the temperature difference increases, the thermal stratification is more pronounced and the velocity fluctuation peak moves towards the upper wall of the pipe. © 2024 IEEE.

关键词： Thermocouples

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Supersonic shear layer characteristics of two fluids with a splitter plate

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International Journal of Advanced Nuclear Reactor Design and Technology 2021年 3卷 1-10页

作者： Bai, Yuping Hong, Yibo Zhao, Quanbin Chen, Weixiong Chong, Daotong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Supersonic shear layer development affects mixing between the primary and secondary fluids in a supersonic ejector substantially. The splitter plate plays a key role in shear layer development in the near-trailing-edge region. In this paper, supersonic shear layers with various splitter plate thicknesses are calculated and analyzed. Two types of instability modes are found when various splitter plate thicknesses are used. The shock wave strength and absolute unstable region determine the instability modes. Shock waves can limit instability development but an absolute unstable region promotes instability development. Velocity thickness growth rates are found to be the result of the merging process between two or more adjacent vortices in the transition region. The number of vortices that merge depends on the ratio of the vortex shedding and nature frequencies. The velocity thickness growth rates are larger under the local instability mode than under the global instability mode since three vortices merge under the former mode but two vortices merge under the latter. This study may provide a helpful reference for the design of supersonic ejectors. © 2021 Xi'an Jiaotong University

关键词： Vortex flow

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Study on startup characteristics of prototype once-through steam generator for China fast reactor

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International Journal of Advanced Nuclear Reactor Design and Technology 2022年第1期4卷 26-35页

作者： Min, Xin Zhang, Dalin Xu, Rongshuan Wang, Shibao Chen, Youchun Wang, Chenglong Tian, Wenxi Qiu, Suizheng Su, G.H. State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Lab. of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an710049 China

Once-through steam generator (OTSG) is a vital heat transfer equipment of China Fast Reactor-600 (CFR-600), and its startup characteristics are of great importance to the safe operation of nuclear power plant. In this paper, first of all, the Thermal-hydraulic analysis Code Of Sodium heated once-through Steam generator (TCOSS) has been further optimized, and the code was introduced in the text. Secondly, the Steam Generator Test Facility (SGTF) and India Commercial Fast Breeder Reactor (CFBR) were selected for steady-state verification, and the feedwater flow rate increase condition of the prototype OTSG experiment was selected for transient verification. All the verifications were in good compliance, which proved the reliability of the TCOSS code for subsequent calculation of startup conditions. Finally, taking the prototype OTSG of CFR-600 as the research object, and the transient characteristics of cold startup and hot startup have been predicted and analyzed. The results show that both processes of cold startup and hot startup for prototype OTSG can be realized stably. The simulation results of startup processes showed a good agreement with expectations, which can provide support for the development of CFR-600 steam generator. © 2022 Xi'an Jiaotong University

关键词： Steam generators

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A Simulation Study of Solar Thermal Steam Generation for Thermal Recovery of Thick Oil Based on Aspen Plus 4

A Simulation Study of Solar Thermal Steam Generation for The...

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2022 4th International Conference on New Energy System and Electrical engineering, NESEE 2022

作者： Chen, Pengfei Chen, Kang Peng, Huaiwu Zhang, Yanlong Bawaa, Baercheng Zhao, Qiuyang Institute of Solar Engineering Technology Northwest Engineering Corporation Limited PowerChina Xi'an China State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an710049 China

High-temperature steam injection is a common means of thermal recovery of thick oil. Although the steam injection boiler currently used for thick oil injection can achieve fast start-stop control, the power consumption of the pump is large, and the boiler control is demanding. Besides, a large amount of fossil fuel is needed to supply the heat required for steam heating. Using solar thermal to realize the transformation of solar energy-molten salt heat energy-steam energy can effectively reduce the burning of fossil fuels and realize clean thermal recovery of thick oil. To ensure the actual demand of thermal recovery of thick oil, it is necessary to determine a reasonable steam evaporation volume and vapor phase fraction. This paper simulates a solar thermal heat exchange system for molten salt-steam based on Aspen Plus. The simulation results show that the heat load and required solar panel area of all heat exchangers rise when the evaporation volume increases. However, the superheater grows most slowly. When the vapor phase fraction at the evaporator outlet rises to 1, there is no phase change heat transfer in the superheater, and its heat load plummets to 230 kW. © Published under licence by IOP Publishing Ltd.

关键词： Steam

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Waste heat recovery in the coal-fired power generation integrated with post-combustion 3

Waste heat recovery in the coal-fired power generation integ...

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3rd International Conference on Electrical engineering and Mechatronics Technology, ICEEMT 2023

作者： Yang, Yali Wang, Guiwen Li, Yan Liu, Yongping Fu, Yue Liu, Ming Guoneng Jinjie Energy Co. Ltd Yulin China Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an710049 China

ISBN: (纸本)9798350303698

Post combustion systems (PCS) are a viable technology option to reduce carbon dioxide in the electricity production. However, the energy-intensive of PCC precludes its wide scale application. As for the optimization of the post combustion system, there is an optimal inlet temperature of the stripper. By optimizing the parameter of the post combustion system, the energy consumption rate of the post combustion system decreased by 1.4 GJ/t CO2 under 100% THA compared to the original post combustion system. The needed heat by the stripper shows a fall with the decrease of the unit load ratio. However, the heat changes of the post combustion system decrease with the decrease of the unit load ratio under 90% absorption rate. The efficiency penalty can be as low as 4.1% through waste heat recovery. © 2023 IEEE.

关键词： Carbon dioxide

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Experimental and Numerical Investigations on Heat Transfer Characteristics of Supercritical Water in a Vertical Tube

SSRN

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SSRN 2024年

作者： Du, Xiaocheng An, Ning Wei, Ziyu Yang, Dong State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University China

Heat transfer performance of working medium is important for supercritical units. In this work, heat transfer experiments and simulations were carried out at 25 to 29.8 MPa. The impacts and influence mechanisms of operation parameters on heat transfer characteristics were analyzed. To describe the fluid heat storage capacity, a metric called cdv is proposed. The findings indicate that thermal conductivity, cdv, and flow turbulence intensity are the three types of factors influencing heat transfer characteristics. As mass flux rises, the radial flow turbulence intensity increases, leading to an improvement in heat transfer performance. The impact of heat flux is mainly showed in high enthalpy zone. Due to the reduction in radial thermal conductivity, heat transfer enhances as heat flux decreases. Large specific heat zone, where the thermophysical parameters vary quickly, are where the influence of pressure is most evident. Because of the high thermal conductivity and cdv, the heat transfer characteristics get better as pressure drops. Finally, typical heat transfer correlations were evaluated using experiment results. The Bishop, Mokry and Miropoiskii-Shitsman correlations exhibited relatively large errors, and the correlations proposed by Swenson and Jackson have a low error and are highly consistent with the experiment results. © 2024, The Authors. All rights reserved.

关键词： Heat flux

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Investigation on the Transient Thermal Performance of a Mini-Channel Cold Plate for Battery Thermal Management

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Journal of Thermal Science 2021年第3期30卷 914-925页

作者： FANG Yidong SHEN Jiali ZHU Yue YE Fei LI Kang SU Lin School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai 200093China

Cold plate is an important component for a liquid battery thermal management *** order to study the transient thermal performance of the cold plate under conditions with sharply increasing heat loads,the numerical model of a battery cold plate is *** validation experiment shows that the error between the simulation and experiment is around 2.5%to 5%.Effects of the coolant flow rate,the increase in heat flux,and the channel number are analyzed to study the transient thermal performance of the cold *** show that the average temperature of the cold plate at 540 s is lowered from 28.3℃ to 26.9℃ when the coolant flow rate is raised from 0.065 kg/s to 0.165 kg/*** temperature deviation is decreased when the coolant flow rate is increased from 0.065 kg/s to 0.115 kg/s;however,it is slightly increased if the coolant flow rate is further *** average temperature and temperature deviation are raised if the final heat flux is increased from11000 W/m^(2) to 16500 W/m^(2),which are 2 and 3 times of the initial,*** addition,increasing the channel number has slightly positive effect on the average temperature of the cold plate,while the temperature deviation is increased when the channel number is increased from 3 to 11 due to the non-uniform velocity distribution between each *** results of this study will be helpful during the design of cold plate for battery thermal management,especially for transient conditions with sudden rising heat loads like thermal runaway.

关键词： battery thermal management cold plate transient analysis temperature distribution mini-channel

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