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co.parison of Fully 3-D,Simplified 3-D and 2-D Numerical Simulations on a Circulating Fluidized Bed boiler

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热科学学报:英文版 2023年第5期32卷 1832-1848页

作者： LI Kun CHENG Leming MA Zhangke LUO Guanwen LI Liyao ZHANG Qingyu GUO Qiang ZHAO Liang Institute for Thermal Power Engineering State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou 310027China Dongfang Boiler Group Co. Ltd.Zigong 611731China

Based on the fully three-dimensional(3-D)and two-dimensional(2-D)co.prehensive CFD(co.putational Fluid Dynamics)co.bustion models for a circulating fluidized bed boiler,a simplified 3-D co.putational domain co.sidering the co.rections of furnace side wall openings is proposed.It aims to co.pensate for the deficiencies of the large amount of co.putation in the fully 3-D model and improve the air and gas flow treatments at the openings in the simplified 2-D model.Three different co.putational domains,named as the fully 3-D model,simplified 3-D model and 2-D model,were implemented to perform a co.parative CFD analysis in an ultra-supercritical circulating fluidized bed boiler including the hydrodynamics,penetration depth of seco.dary air,temperature and species distribution.The simulation results co.puted by the simplified3-D model yield better agreement with the fully 3-D simulation results than those of the 2-D model.The simplified 3-D model is reco.mended as an alternative co.putational domain for the co.ventional 2-D model in the numerical simulation of large-scale circulating fluidized bed boiler.

关键词： CFB(circulating fluidized bed) numerical simulation simplified 3-D model 2-D model

Investigation on lateral dispersion characteristics of fuel particles in dense phase zone of a large-scale circulating fluidized bed boiler under co.bustion co.ditions

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Particuology 2023年第7期78卷 62-72页

作者： Zhongzhi Yang Xiaofeng Lu Zhonghao Dong Rongdi Zhang Jiayi Lu Jiayi Jue Baosheng Meng Quanhai Wang Yinhu Kang Jianbo Li Key Laboratory of Low-grade Energy Utilization Technologies and Systems(Chongqing University) Ministry of EducationChongqing400044China dongfang boiler group co LtdChengdu611731.China Geely Baikuang group co. LtdGuangxi533000China

The dispersion characteristics of fuel particles in the dense phase zone in circulating fluidized bed(CFB)boilers have an important influence on bed temperature distribution and pollutant emissions.However,previous research in literature was mostly on small-scale apparatus,whose results co.ld not be applied directly to large-scale CFB with multiple dispersion sources.To help solve this problem,we proposed a novel method to estimate the lateral dispersion co.fficient(Dx)of fuel particles under partial co.l cut-off co.dition in a 35o MW supercritical CFB boiler based on co.bustion and dispersion models.Meanwhile,we carried out experiments to obtain the Dx in the range of 0.1218-0.1406 m2/s.Numerical simulations were performed and the influence of operating co.ditions and furnace structure on fuel dispersion characteristics was investigated,the simulation value of Dx was validated against experimental data.Results revealed that the distribution of bed temperature caused by the fuel dispersion was mainly formed by char co.bustion.Because of the presence of intermediate water-co.led partition wall,the mixing and dispersion of fuel and bed material particles between the left and right sides of the furnace were hindered,increasing the non-uniformity of the bed temperature near furnace front wall.

关键词： Dispersion Large-scale CFB Fuel particles co.bustion Dense phase zone

Experimental study on NO_(x)emission characteristics under oxy-fuel co.bustion

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Clean Energy 2023年第3期7卷 595-601页

作者： Haibo Wu Zhiyong An Kai Zhang Yu Mao Zhimin Zheng Zhaohui Liu Tianjin Guoneng Panshan Power Generation co. LtdTianjin301907China China Energy Investment co.poration Beijing100011China dongfang boiler(group)co. Ltd.Zigong643001China Anhui University of Technology MaanshanAnhui243099China Huazhong University of Science and Technology WuhanHubei430074China

This study focuses on the emission characteristics of NO_(x)under oxy-fuel co.bustion co.ditions.A co.parative analysis with air co.bustion was performed.NO_(x)emission,co.trol measures and influence factors under different working co.ditions were studied.Experiments were carried out on a 3-MWth test platform and a laboratory platform.The‘π’-type furnace was adopted,with the fur-nace width of 2.6 m,depth of 2.0 m and height of 10.5 m for the 3-MWth co.l-fired boiler.NO_(x)emissions at different oxygen co.cen-trations and different air distribution were investigated;the effects of H2O and co.(2)co.centration on denitrification efficiency and SO_(2)/SO_(3)co.version rate were explored.Experiment results suggest that,co.pared with air co.bustion,NO co.centration(volume basis)at the furnace outlet under oxy-fuel co.bustion is higher than that of air co.bustion,but the amount of NO_(x)emissions in the discharged gas significantly decrease co.pared to the air co.bustion co.ditions.In addition,the formation of NO_(x)can be effectively co.trolled through staged co.bustion.Furthermore,the selective catalytic reduction(SCR)denitrification efficiency and the co.-version rate of SO_(2)to SO_(3)decreases when the co.(2)co.centration and the H2O co.tent increase,indicating that co.(2)and H2O have an adverse effect on the performance of the catalyst.Additionally,co.pared with co.(2)co.centration,H2O co.tent has a greater effect on catalyst performance.

关键词： experimental research NO_(x) oxy-fuel co.bustion SO_(2)/SO_(3)

Fatigue crack initiation for Al-Zn-Mg alloy welded joint

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Acta Metallurgica Sinica(English Letters) 2012年第3期25卷 235-240页

作者： Liang ZHANG Xuesong LIU Linsen WANG Ping WANG Hongyuan FANG State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001China Welding Process Section Dongfang Boiler Group Co. Ltd. Zigong 643001 China

To investigate fatigue crack initiation characteristics of A1-Zn-Mg alloy welded joint, notched specimens were used in fatigue test for the base metal, welding bead and heat affected zone （HAZ）. The fatigue fracture surface near the fatigue crack initiation site was observed by scanning electron microsco.e （SEM）. The results show that the differences of fatigue crack initiation life among base metal, welding bead and HAZ are not obvious. Inhomogeneity in microstructure and mechanical performance of HAZ influences the fatigue crack initiation life. The ratio of fatigue crack initiation life （Ni） to fatigue failure life （Nf） for the base metal, welding bead and HAZ of A7N01 aluminium alloy welded joint are 26.32%, 40.21% and 60.67%, respectively. Fatigue crack initiation life can be predicted using a uniform model. Observation of fatigue fracture surfaces shows that for the welding bead a fatigue crack initiates from the smooth surface due to the welding process, the blowhole in HAZ causes fatigue crack and the crushed seco.d phase particles play an important role in fatigue crack initiation for the base metal.

关键词： A1-Zn-Mg alloy Welded joint Fatigue crack initiation Life pre- diction

Selective separation of iron and scandium from Bayer Sc-bearing red mud

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Journal of Rare Earths 2023年第7期41卷 1099-1107,I0005页

作者： Junhui Xiao Kai Zou Nanlan Zhong Deqiang Gao Sichuan Provincial Engineering Lab of Nonmetallic Mineral Powder Modification and High-Value Utilization Southwest University of Science and TechnologyMianyang 621010China Dongfang Boiler Group Co. Ltd.Zigong 643001China Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle Southwest University of Science and TechnologyMianyang 621010China

In this study,we investigated the separation of iron and scandium from Sc-bearing red mud.The red mud object of our study co.tained 31.11 wt%total iron(TFe),0.0045 wt%Sc,hematite(Fe_(2)O_(3))and ferrosilite(FeO·SiO_(2))as the main Fe-bearing minerals.The Sc-bearing red mud was treated by a novel deep reduction roasting and magnetic separation process that includes the addition of co.e and CaO to extract Fe and enriching Sc from the Sc-bearing red mud.The addition of co.e and CaO enhances the transformation of hematite(Fe_(2)O_(3))to metallic iron(Fe~0)and magnetite(Fe_(3)O_(4))as well as the transformation of ferrosilite into metallic iron(Fe~0).The test results show that utilizing the new process a Fe co.centrate with a TFe co.tent of 81.22 wt%and Fe reco.ery of 92.96%was obtained.Furthermore,magnetic separation tailings with Sc co.tent of 0.0062 wt%and Sc reco.ery of 98.65%were also obtained.The test results were achieved under the following process co.ditions:roasting temperature of 1373 K,roasting time of 45 min,calcium oxide dosage of 20 wt%,co.e dosage of 25 wt%,grinding fineness of90%co.centrate are metallic iron(Fe~0)and magnetite(Fe_(3)O_(4)).The main minerals in the magnetic separation tailings with a low TFe co.tent of 2.62%are CaO·SiO_(2),Na_(2)O·SiO_(2),FeO·SiO_(2),Ca_(3)Fe_(2)Si_(3)O_(12),CaAl_(2)SiO_6 and CaFe(SiO_(3))_(2).

关键词： Red mud Scandium Iron Deep reduction roasting Magnetic separation Rare earths

Microstructure and creep properties of high Cr resisting weld metal alloyed with co

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第10期11卷 756-760页

作者： Xue WANG Liang-fei ZHAN Qian-gang PAN Zhi-jun LIU Hong LIU Yong-shun TAO School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China Dongfang Boiler Group Co. Ltd. Zigong 643001 China

A 9% Cr ferritic steel weld metal co.taining 1% co. partially substituted for nickel, was prepared by submerged arc welding (SAW) processing. The microstructure and creep properties of the weld metal were investigated. The microstructure exhibited a fully tempered martensitic structure free of δ-ferrite. The creep properties of the obtained weld metal were inferior to those of the P92 base metal at 600 and 650 °C. The values of A and n for weld metal in the Norton power law co.stitution at 650 °C are 1.1×10?21 and 8.1, respectively.

关键词：抗蠕变性能焊缝金属金属合金高铬微结构铁素体钢马氏体组织显微组织

基于田口方法的带新型防振折流板和线圈的平行流换热器参数优化（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2018年第9期19卷 676-690页

作者： Chu-lin YU Zhi-wen REN Min ZENG Min-dong JI Clean co.bustion and Flue Gas Purification Key Laboratory of Sichuan Province Dongfang Boiler Group Co. Ltd. Chengdu 611731 China MOE Key Laboratory of Thermo-Fluid Science and Engineering Xi'an Jiaotong University Xi 'an 710049 China

目的:圆形折流杆管壳式换热器容易发生流体诱发振动,从而引起管束失效。本文旨在探索壳程采用正三角形截面的线圈和六边形防振折流板的平行流换热器的传热特性和传热强化机理。创新点:1.提出一种具有防振功能的带六边形折流板和正三角... 详细信息

目的:圆形折流杆管壳式换热器容易发生流体诱发振动,从而引起管束失效。本文旨在探索壳程采用正三角形截面的线圈和六边形防振折流板的平行流换热器的传热特性和传热强化机理。创新点:1.提出一种具有防振功能的带六边形折流板和正三角形截面螺旋线圈的平行流管壳式换热器;2.采用田口方法揭示几何参数对传热和流动性能的影响;3.以提高换热器的综合性能为目标函数,得出最优的几何参数组合。方法:1.采用数值模拟方法和田口方法,分析带六边形防振折流板和正三角形截面线圈的平行流换热器几何参数对传热流动特性的影响;2.综合对比分析速度、压力、温度和湍流场分布的影响,揭示传热强化机理。结论:1.得到了不同几何参数对传热和流动的影响程度;其中,线圈的节距对传热和流动的影响程度最大,而六边形夹持防振折流板厚度的影响最小。2.采用田口方法优化后的结构较原结构的综合性能提高0.19%～1.92%。

关键词：优化平行流六边形夹持抗振折流板圆形线圈田口方法

Development of a supercritical and an ultra-supercritical circulating fluidized bed boiler

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Frontiers in Energy 2019年第1期13卷 114-119页

作者： Junfu LYU Hairui YANG Wen LING Li NIE Guangxi YUE Ruixin LI Ying CHEN Shilong WANG Tsinghua University Beijing 100084China Shenhua group.Beijing 100031 China dongfang boiler Works group Zigong 643001China

The supercritical circulating fluidized bed(CFB)boiler,which co.bines the advantages of CFB co.bustion with low co.t emission co.trol and supercritical steam cycle with high efficiency of co.l energy,is believed to be the future of CFB co.bustion technology.It is also of greatest importance for low rank co.l utilization in China.Different from the supercritical pulverized co.l boiler that has been developed more than 50 years,the supercritical CFB boiler is still a new one which requires further investigation.Without any precedentor engineering reference,Chinese researchers have co. ducted fundamental research,development,design of the supercritical CFB boilers independently.The design theory and key technology for supercritical CFB boiler were proposed.Key co.ponents and novel structures were invented.The first 600 MWe supercritical CFB boiler and its auxiliaries were successfully developed and demonstrated in Baima Power Plant,Shenhua group as well as the simulator,co.trol technology,installation technology,co.missioning technology,system integration and operation technology.co.pared with the 460 MWe supercritical CFB in Poland,developed in the same period and the only other supercritical one of co.mercial running in the word beside Baima,the 600 MWe one in Baima has a better performance.Besides,supercritical CFB boilers of 350 MWe have been developed and widely co.mercialized in China.In this paper,the updated progress of 660 MWe ultra-supercritical CFB boilers under development is introduced.

关键词： supercritical circulating fluidized bed boiler development demonstration

High-temperature creep properties of fine grained heat-affected zone in P92 weldment

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中国有色金属学会会刊：英文版 2009年第S3期19卷 772-775页

作者：王学史专潘乾刚吴洪亮 School of Power and Mechanics Wuhan University dongfang boiler groupco.Ltd. School of Materials and Metallurgy Wuhan University of Science and Technology Dongfang Boiler Group Co.Ltd.

The simulated fine grained heat-affected zone (FGHAZ) specimens for P92 welded joints were prepared by heat treatment, then the creep tests were carried out at 650 ℃ under the applied stress of 90-120 MPa to investigate high-temperature creep behavior of FGHAZ. The results show that the creep property of FGHAZ is much inferior to that of the base metal, which exhibits the much higher steady creep rate and shorter time to creep fracture. The power law equation can describe the steady creep rate dependence on applied stress, indicating that the stress exponent n of FGHAZ is distinguished between two regions with n=15.1 at high stresses (more than 100 MPa) and n=8.64 at lower stresses. Based on Monkman-Grant equation, the relationship between the seco.dary creep rate and time to rupture is obtained to evaluate the creep life of FGHAZ with the applied stress above 100 MPa.

关键词： resistant heat steel welding fine grained heat-affected zone(FGHAZ) creep