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COUPLED SIMULATION ON FLUE GAS AND STEAM DEVIATION OF FINAL REHEATER IN A 600 MW TANGENTIALLY FIRED BOILER WITH REVERSED SEPARATED OVERFIRE AIR UNDER DIFFERENT LOADS

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Thermal Science 2025年第2期29卷 983-997页

作者： Wang, Zhengjiang Wang, Xingjun Yang, Yang Li, Jiawei Su, Yongning Jiang, Qi Li, Xiaojun Xing, Wenbin Yi, Jinhao Liu, Hu Xi’an TPRI Water-Management – Environmental Protection Co. Ltd. State Key Laboratory of High-Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage Xi’an China Huaneng Longdong Energy Co. Ltd. Zhengning Power Plant Qingyang China State Key Laboratory of Multi-phase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an China

Flue gas and steam deviation of the final reheater is an inevitable problem in the tangentially fired boiler due to the remaining gas spinning at the furnace exit. An in-house 1-D process simulation code coupled with comprehensive 3-D combustion simulation was adopted to accurate investigate the characteristics of the flue gas and steam maldistribution of the final reheater in a 600 MW supercritical tangentially fired boiler. Firstly, the combustion simulation result was validated by the in-house fire-side heat transfer calculation data, then the effect of boiler loads and reversed separated overfire air (SOFA) deflection angles on the gas temperature deviation, velocity deviation and outlet steam temperature of reheater were conducted. The results showed that the deviation of flue gas temperature and velocity increases as the boiler load decreases. The reversed SOFA deflection angle plays a crucial role in improving the gas distribution under low loads, and the deviation of flue gas temperature and velocity is the smallest when the angle is –18° under 100% boiler maximum continuous rating (BMCR), 75% and 50% turbine heat acceptance (THA), but it is the smallest when the angle is –9° under 35% BMCR load. Moreover, the maximum outlet steam temperature difference between parallel heating surfaces of the final reheater increases from 84.68–106.48 K as the boiler load decreases from 100% BMCR to 75% THA, and it is mainly affected by the flue gas temperature deviation rather than the mass-flow rate maldistribution when the deflection angle changes from –9° to –18°. © (2025), (Serbian Society of Heat Transfer Engineers). All rights reserved.

关键词： Steam

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Constructing electron transport channel of SnO2/BaSO4 on g-C3N4 for enhanced visible-light-driven photocatalytic H2 production

Materials Today Catalysis

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Materials Today Catalysis 2025年 9卷

作者： Dong, Gongyue Guo, Xiaojuan Cheng, Cheng Chen, Feng Zhang, Jinfeng Du, Yanping Meng, Wei Liu, Maochang Shi, Jinwen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Guangdong Provincial Key Laboratory of Multi-energy Complementary Distributed Energy Systems Dongguan University of Technology Dongguan523808 China School of Engineering Lancaster University LancasterLA1 4YW United Kingdom Gansu Company PipeChina Lanzhou730060 China Hunan Provincial Key Lab of Dark Tea and Jin-Hua Department of Material & Chemical Engineering Hunan City University Yiyang413000 China

Graphitic carbon nitride (g-C3N4) is confronted with the issue of poor utilization of photogenerated charge carriers, thereby leading to limited performance of photocatalytic hydrogen (H2) production, which restricts its potential application. Herein, the electron transport material SnO2/BaSO4 was synthesized to integrate with g-C3N4 for addressing the above problem. Various characterizations were conducted to investigate the g-C3N4-SnO2/BaSO4 photocatalyst, and it demonstrated that photogenerated electrons from g-C3N4 expeditiously migrate to SnO2/BaSO4 nanoparticles, which markedly hindered photogenerated carriers’ recombination. Subsequently, the g-C3N4-SnO2/BaSO4 photocatalyst demonstrated promoted photocatalytic H2 production at a rate of 14.2 μmol h−1 under visible-light illumination, which was 2.5 times higher than that of pristine g-C3N4. © 2025 The Authors

关键词： Barium sulfate

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Model for seawater fouling and effects of temperature,flow velocity and surface free energy on seawater fouling

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Chinese Journal of Chemical engineering 2016年第5期24卷 658-664页

作者： Dazhang Yang Jianhua Liu Xiaoxue E Linlin Jiang School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Key Laboratory of Multi-phase Flow and Heat Transfer Shanghai 200093China

A kinetic model was proposed to predict the seawater fouling process in the seawater heat *** new model adopted an expression combining depositional and removal behaviors for seawater fouling based on the Kern–Seaton *** present model parameters include the integrated kinetic rate of deposition(k d)and the integrated kinetic rate of removal(k r),which have clear physical signi ficance.A seawater-fouling monitoring device was established to validate the *** experimental data were well fitted to the model,and the parameters were obtained in different *** and EDX analyses were performed after the experiments,and the results show that the main components of seawater fouling are magnesium hydroxide and aluminum *** effects of surface temperature,flow velocity and surface free energy were assessed by the model and the experimental *** results indicate that the seawater fouling becomes aggravated as the surface temperature increased in a certain range,and the seawater fouling resistance reduced as the flow velocity of seawater ***,the effect of the surface free energy of metals was analyzed,showing that the lower surface free energy mitigates the seawater fouling accumulation.

关键词： Fouling Seawater Model Surface temperature flow velocity Surface free energy

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The preliminary safety analysis of a S-CO2 Brayton cycle cooled reactor system 18

The preliminary safety analysis of a S-CO2 Brayton cycle coo...

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18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2019

作者： Gao, Chuntian Wu, Pan Shan, Jianqiang State Key Laboratory of Multi phase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

Safety analysis is an important issue in the feasibility evaluation of a new reactor concept. The preliminary safety analysis of a reactor system, which applies simple Super-critical Carbon Dioxide (S-CO2) Brayton cycle as its direct power conversion system, is carried out via an in-house safety analysis code SCTRAN/CO2 in this paper. Typical accidents for gas cooled reactor and Brayton cycle system are analyzed, like loss of flow accident (LOFA), reactivity insertion accident (RIA). Passive reactor decay heat removal system is evaluated under these accidents. This work will be benefit for the safety evaluation and safety system design for the newly proposedS-CO2 cooled reactor concept. © 2019 American Nuclear Society. All rights reserved.

关键词： Carbon dioxide

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Mathematical model and numerical simulation of helical baffles heat exchanger

Mathematical model and numerical simulation of helical baffl...

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作者： Shen, Renjie Feng, Xiao Gao, Xiaodong Department of Chemical Engineering State Key Laboratory of Multi-Phase Flow in Power Engineering Xi'An Jiaotong University Xi'an China

With the theory of the Reynolds stress model applied, a mathematical model of the flow and heat transfer of the helical baffles heat exchanger is established. The commercial software FLUENT is used to simulate the influence of helical baffles on heat transfer capability and flow resistance of helical baffle heat exchangers by unstructured grid. The numerical simulation results at the 35° helix inclination angle are compared with those of experiment. © 2004 by Begell House, Inc.

关键词： Heat exchangers

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ECT flow regime identification technology based on 2D Maximum Entropy Threshold Image Segmentation with ChaosParticle Swarm optimization algorithm 6

ECT flow regime identification technology based on 2D Maxi...

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6th World Congress in Industrial Process Tomography

作者： Luo, Zhengyuan Hu, Hongli Xu, Tongmo Tan, Houzhang State Key Laboratory of Electrical Insulation for Power Equipment Xi’an Jiaotong University Xi’an710049 China State Key Laboratory of Multi-phase Flow for Power Engineering Xi’an Jiaotong University Xi’an710049 China

ISBN: (纸本)9780853163220

Electrical capacitance tomography technology is widely used in the field of flow regime identification. And image segmentation is one of the key technologies of flow regime identification. 2D Maximum Entropy Threshold Image Segmentation is a newly developed method to segment images. A method of 2D Maximum Entropy Threshold Image Segmentation with ChaosParticle Swarm optimization algorithm is presented to segment the images collected by an ECT system. Thus, more spatial information of an image is sufficiently used by the method;better effect is obtained to identify the flow regime. A laboratorylevel experiments prototype is built, and a gassolid twophase flow regime identification experiment is carried out on the prototype to check the image segmentation method. The result shows the flow regime identification of ECT system is satisfactory. © International Society for Industrial Process Tomography, 2010. All rights reserved.

关键词： Image segmentation

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The code development and thermo-hydrodynamic analysis of the reflood during severe accident in PWR

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Annals of Nuclear Energy 2017年 99卷 9-18页

作者： S.P. Niu Y.P. Zhang W.X. Tian S.Z. Qiu G.H. Su State Key Laboratory on Power Engineering and Multi-Phase Flow Xi’an Jiaotong University Xi’an 710049 China

The reflooding, i.e. injecting water to the uncovered degraded core, is the most important accident management measure to terminate a severe accident and to stop the core from being melt in LWR. The reflooding of LWR core during severe accident may lead to the core cooling and cessation or to the temperature escalation and further development of the accident. That will depend on several important parameters, characterizing the core state and the way of the reflooding. Appropriate understanding of the complex core reflooding phenomena is necessary for the prediction of the system evolution. Based on the reflood flow and heat transfer characteristics, a thermo-hydraulic analysis model for the reflood phase was developed and presented in this paper. Based on this model, a code module was developed for the thermo-hydraulic analysis of reflood. The calculation results for the different conditions are compared with the FLECHT data and the QUENCH data, respectively. The results showed that the calculation results and the experiment data are in substantial agreement. Then the influences of the system pressure, the subcooling of coolant and the wall temperature on reflood characteristics were studied, too. The quench velocity falls when the wall temperature went up. The quench velocity increases when the system pressure increases. The quench velocity drops with the increasing of water temperature. The paper also provides a theoretical basis for safety analysis of fuel element cladding during reflood phase.

关键词： Severe accident Reflood Thermo-hydraulic analysis Code development

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Numerical research on solar heating system with seasonal water tank heat storage

Numerical research on solar heating system with seasonal wat...

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2013 International Conference on Materials for Renewable Energy and Environment, ICMREE 2013

作者： Sun, Dongliang Xu, Jinliang State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China Beijing Key Laboratory of Multi-Phase flow and Heat Transfer of Low-Grade Energy North China Electric Power University Beijing China

ISBN: (纸本)9781479933365

This paper makes researches on a solar heating system with seasonal water tank heat storage (SHS-SWTHS) for a 9000m2 building located at Beijing, based on a similarity principle research method proposed by the present authors. According to the numerical results, the influence of the embedded depth of water tank on the system performance is analyzed based on two typical soils: granite and sand. For the granite soil, due to its high thermal conductivity and its high heat capacity, the system performance is affected greatly by the embedded depth. For the sand soil, due to its low thermal conductivity and its low heat capacity, the system performance nearly isn't affected by the embedded depth. However, with the increase of the embedded depth of water tank, the system performance tends to be consistent in different soils. © 2013 IEEE.

关键词： Heat storage

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2012 International Conference on Biomedical engineering and Biotechnology, iCBEB 2012

作者： Sun, Dongliang Xu, Jinliang State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China Beijing Key Laboratory of Multi-Phase Flow and Heat Transfer of Low-Grade Energy North China Electric Power University Beijing China

ISBN: (纸本)9780769547060

In this paper, a similarity principle research method is proposed to research the solar heating system with seasonal water tank heat storage (SHS-SWTHS). In this method, the similarity principle is applied to build a model. The time period of the model is one hundredth of the prototype, and the volume of the model is one thousandth of the prototype. Then, the numerical and experimental researches on the SHS-SWTHS system can be implemented based on this model, which has the following advantages compared with the prototype: (1) the computation time can be shortened largely, (2) the investment and experiment period can be decreased greatly. In this paper the feasibility of this model is verified by the numerical researches, in which the PISO algorithm is adopted to compute the fluid flow and heat transfer in the water tank and the coupled heat transfer between the water tank and the surrounding soil. The result will lay a foundation for the further numerical and experimental researches based on the model. © 2012 IEEE.

关键词： Heat storage

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Study on Seepage Characteristics and Complex Well Pattern in Low Permeability Reservoir

Study on Seepage Characteristics and Complex Well Pattern in...

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作者： Lv jin Chemical-Machinery Department Mechanical Engineering CollegeXi’an Shiyou University The State Key Laboratory of Multi-phase Flow Xi’an Jiaotong University

Experimental research on the joint development of horizontal and vertical wells is carried out in this *** well patterns（VIVP,HIVP,VIHP and HIHP）were used to compare the advantages and disadvantages of water-injection and oil-production in horizontal and vertical *** is concluded that HIHP well pattern can form linear drive,delay injection water breakthrough time,improve sweep efficiency and reservoir recovery rate;horizontal wells are more suitable as production wells.

关键词： Low permeability Horizontal well Recovery rate Complex well pattern

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