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Effect of secondary air on NO emission in a 440 t/h circulating fluidized bed boiler based on CPFD method

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Particuology 2023年第12期83卷 18-31页

作者： Hongpeng Liu haiwen sun Ye Bi Chunxia Jia Lei Zhang Yanlong Li Hong Qin Qing Wang Engineering Research Centre of Oil Shale Comprehensive Utilization Ministry of EducationSchool of Energy and Power EngineeringNortheast Electric Power UniversityJilin132012China Department of Chemical&Biological Engineering University of British ColumbiaVancouverV6T1Z3Canada Northeast Branch of Huadian Electric Power Research Institute Co. LtdShenyang110000China

The 440 t/h circulating fluidized bed boiler was numerically simulated by the Computational Particle Fluid Dynamics(CPFD)*** combustion characteristics of circulating fluidized bed boiler and the effect of secondary air on NO emission were *** full-scale three-dimensional model of a 440 t/h circulating fluidized bed boiler was *** rationality of the grid was validated by the experimental data of material layer *** accuracy of the simulation was validated by measuring the temperature of each measuring point in the dense phase *** combustion conditions in the furnace under different setting modes were *** effects of secondary air rates on NO formation in fluidized bed were *** results show that when the secondary air rate increases to 27%,the proper secondary air rate has a positive effect on the inhibition of NO generation,and the proper strengthening of the central air supply will improve the permeability of the secondary air and make the combustion more uniform and *** the secondary air rate increases to 33%,excessive improvement of air classification and central air distribution will affect the stability of circulating fluidized bed ***,air classification and strengthening of central air supply can be used together to inhibit the generation of NO.

关键词： Circulatingfluidized bed Low nitrogen combustion Computational particlefluid dynamics (CPFD) Numerical simulation Secondary air

Threat evaluation method of warships formation air defense based on AR(p)-DITOPSIS

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Journal of Systems Engineering and Electronics 2019年第2期30卷 297-307页

作者： sun haiwen XIE Xiaofang Coastal Defense College Naval Aviation University

For the target threat evaluation of warships formation air defense, the sample data are frequently insufficient and even incomplete. The existing evaluation methods rely too much on expertise and are difficult to carry out for the dynamic evaluation on time series. In order to solve these problems, a threat evaluation method based on the AR(p)(auto regressive(AR))-dynamic improved technique for order preference by similarity to ideal solution(DITOPSIS) method is proposed. The AR(p) model is adopted to predict the missing data on the time series. Then, the entropy weight method is applied to solve each index weight at the objective point. Kullback-Leibler divergence(KLD) is used to improve the traditional TOPSIS, and to carry out the target threat evaluation. The Poisson distribution is used to assign the weight *** results show that the improved AR(p)-DITOPSIS threat evaluation method can synthetically take into account the target threat degree in time series and is more suitable for the threat evaluation under the condition of missing the target data than the traditional TOPSIS method.

关键词： AR(p) model Kullback-Leibler divergence (KLD) dynamic improved technique for order preference by similarity to ideal solution (DITOPSIS) time series threat evaluation

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海上异构无人集群协同运用发展概况及启示

水下无人系统学报 2024年第2期32卷 275-281页

作者：孙海文王溪野王兆辰孟祥尧陈婷靳子荣海军研究院北京102442 中国人民解放军91286部队山东青岛266000 海军工程大学兵器工程学院湖北武汉266003

无人系统集群凭借其协调度高、完全自主、群体智能等显著特点,可直接影响并改变海上作战样式,世界各海洋强国竞相开展跨域异构无人装备协同运用研究。文中重点分析了当前世界海上异构无人集群协同运用发展现状及典型作战运用案例,分析... 详细信息

无人系统集群凭借其协调度高、完全自主、群体智能等显著特点,可直接影响并改变海上作战样式,世界各海洋强国竞相开展跨域异构无人装备协同运用研究。文中重点分析了当前世界海上异构无人集群协同运用发展现状及典型作战运用案例,分析了其具备的跨域多异构节点自组网通信、多域多源信息融合态势感知和多域大规模异构集群编队控制等特点,最后提出,海上异构无人集群应融合有人无人感知信息、精细化智能决策、强化行动控制模拟训练、构建去中心化集群体系等启示建议。

关键词：跨域异构无人集群协同运用

舰艇平台机动航线与导弹攻击航路一体化设计方法

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兵工学报 2022年第S02期43卷 7-12页

作者：杨华东周末孙海文 91054部队北京102442

针对舰艇平台行动规划与火力机动规划结果冲突,导致回退重算、兵力火力行动规划效率低的问题,提出舰艇平台机动航线与导弹攻击航路一体化设计方法。根据双方平台运动参数及导弹末端攻击角或攻击方向,基于平台最短时间机动战术,进行舰艇... 详细信息

针对舰艇平台行动规划与火力机动规划结果冲突,导致回退重算、兵力火力行动规划效率低的问题,提出舰艇平台机动航线与导弹攻击航路一体化设计方法。根据双方平台运动参数及导弹末端攻击角或攻击方向,基于平台最短时间机动战术,进行舰艇与目标的虚拟遭遇点预测及导弹飞行航路动态规划。迭代计算舰艇平台的机动航向、机动时间及航程等机动参数,并推荐计算本平台的导弹发射点。分别给出了导弹直航方式和航路规划方式下舰艇平台最短时间接敌机动的实现步骤。结果表明,该方法可实现舰艇平台抵达推荐的发射点后,即可立即按规划的导弹飞行航路发射导弹,充分使用导弹的射程,在尽可能远的距离发射,达到“先敌发射、先敌命中”效果。

关键词：舰艇平台反舰导弹机动航线最短时间航路规划一体化

Divergent responses of runoff to climate change in the upper basins of the Third Pole dominated by westerlies and monsoon

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Science China Earth Sciences 2024年第8期67卷 2592-2614页

作者： Qikai sun Fengge SU He sun State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100101China

The diverse climates,distribution of snow and glaciers,and geographic locations directly affect the runoff response to climate change in the upper basins of the Third *** present,a comprehensive analysis of runoff variations and their distinct responses to climate change in the westerlies-and monsoon-dominated upper basins is still *** study comprehensively analyzed annual runoff variations in westerlies-dominated basins(the upper basins of the Aksu(UAKS),Syr Darya(USRD),Yarkant(UYK),Hotan(UHT),Amu Darya(UAMD),and Indus(UI))and monsoon-dominated basins(the upper basins of the Yangtze(UYA),Yellow(UYE),Lancang(ULC),Nujiang(UNJ),and Yarlung Zangbo(UYZ))of the Third Pole from 1961 *** multi-source meteorological data and large-scale circulation factors,this study investigated the divergent responses of runoff in the upper basins to climate change,and explored the large-scale circulation mechanisms underlying runoff variations in these upper *** results showed that:(1)The annual runoff in the majority of upper basins(except for the UYE and UYZ)exhibited an increasing trend,and the annual runoff in the UAKS,UYK,and UI showed a significant increasing trend from1961 to *** annual runoff in the upper basins of the Third Pole changed abruptly from decreasing to increasing between the 1980s and 2000s,with the exception of the UYE.(2)The runoff in the monsoon-dominated upper basins has been controlled primarily by changes in precipitation over the past 55 *** contrast,the runoff in the westerlies-dominated upper basins exhibited three distinct long-term responses to climate change:temperature-dominated(UYK and UHT),precipitation-dominated(USRD and UAMD),and the combined influence of precipitation and temperature(UAKS and UI).Since the 1960s,the sensitivity of runoff to warm season temperature changes in the most westerlies-dominated upper basins has decreased,while the response of runoff to precipitation changes has intensified.(3)The stud

关键词： Upper basins of the Third Pole Climate change Westerlies and monsoon Runoff variations Large-scale circulation factors

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海上无人机蜂群目标威胁评估方法

兵工学报 2022年第S02期43卷 32-39页

作者：孙海文于邵祯江源周末唐嘉钰李丹 91054部队北京102442

针对海上无人机蜂群目标威胁评估问题,构建无人机蜂群威胁评估指标体系,建立海上无人机蜂群威胁评估模型,提出一种改进逼近理想解法的无人机蜂群威胁排序方法,设计二级威胁评估流程。仿真分析结果表明,新方法可以有效准确地对多批次无... 详细信息

针对海上无人机蜂群目标威胁评估问题,构建无人机蜂群威胁评估指标体系,建立海上无人机蜂群威胁评估模型,提出一种改进逼近理想解法的无人机蜂群威胁排序方法,设计二级威胁评估流程。仿真分析结果表明,新方法可以有效准确地对多批次无人机蜂群目标进行威胁评估,为反无人机蜂群作战指挥决策提供参考依据。

关键词：无人机蜂群威胁评估防空作战改进逼近理想解法二级威胁评估流程

Fossil Equidae in the Linxia Basin with Biostratigraphic and Paleozoogeographic Significance

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Acta Geologica Sinica(English Edition) 2024年第1期98卷 1-9页

作者： sun Boyang Key Laboratory of Vertebrate Evolution and Human Origins of the Chinese Academy of Sciences Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China

The Linxia Basin is characterized by an abundance of Cenozoic sediments,that contain exceptionally rich fossil *** are abundant in the Linxia Basin,the fossil record of equids in this region including 16 species that represent 10 *** comparison to other classic late Cenozoic areas in China,the Linxia Basin stands out,because the fauna and chronological data accompanying Linxia equids render them remarkably useful for *** anchitheriines in the region,such as Anchitherium and Sinohippus,represent early equids that appeared in the late stages of the middle and late Miocene,*** the equines,most species of Chinese hipparions have been identified in the Linxia Basin and some species of the genera Hipparion and Hippotherium have FAD records for ***,Equus eisenmannae is one of the earliest known species of Equus in the Old World and is well-represented at the Longdan *** species with precise geohistorical distributions can serve as standards for high-resolution chronological units within this *** at the eastern margin of the Tibetan Plateau and subject to considerable uplift,the Linxia Basin has served as a biogeographic transition area for equids throughout the late Cenozoic.

关键词： Equidae Cenozoic biostratigraphy paleozoogeography Linxia Basin

Achieving simultaneously high conversion and high selectivity for light olefins directly producing from syngas

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Science China Chemistry 2024年第3期67卷 753-754页

作者： Yuhan sun Shanxi Research Institute Huairou Research LaboratoryTaiyuan 030032China Institute of Carbon Neutrality ShanghaiTech UniversityShanghai 201210China

The activity and selectivity are two primary indexes of a successful catalyst for chemical reactions. However,achieving a high activity and a high selectivity simultaneously is a long-standing challenge in catalysis, the socalled activity-selectivity trade-off. In the article recently published in Science, a research team led by Prof.

关键词： selectivity simultaneous catalysis

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电力监控系统的二次安防策略分析

集成电路应用 2022年第5期39卷 198-199页

作者：孙海文宁夏送变电工程有限公司宁夏750003

阐述电力监控系统二次安全防护的特点,状况,策略,包括安全防护分区设计、安全防护技术应用、集中控制的网络隔离装置、完善监控系统应急预案。

关键词：监控系统二次安全防护集中控制应急预案