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Experimental Study on Product Characteristics of Typical Pulverized Coal Preheated by a Self-Preheating Burner

Journal of Thermal Science 2023年第5期32卷 1912-1934页

作者： ZHANG Jinyang OUYANG Ziqu ding hongliang SU Kun Research Center of Fluid Machinery Engineering and Technology Jiangsu UniversityZhenjiang 212013China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

As the major primary energy source in China,coal has been proved to be capable to improve its physical and chemical characteristics by the pretreatment of the self-preheating *** this study,the effects of altering operating conditions including preheating temperature(T_(p))and primary air equivalence ratio(λ_(p))on preheating characteristics of three typical pulverized coal were investigated on a bench-scale test *** high-temperature coal gas compositions along the axis of the riser and at the outlet of the self-preheating burner were measured,and the coal char and coal tar produced in the preheating process were collected and analyzed *** results indicated that with the significant release of volatile and the occurrence of chemical reactions,cracks and micropores emerged on the surface of the particles,making the pore structure on the surface more developed,and T_(p)had the most significant effect on the structure of coal ***,there were evident differences in the corresponding operating conditions when the preheating characteristics of the three typical coal reached *** preheating had the strongest influence on the degree of anthracite *** respect to coal tar,the increase of T_(p)andλ_(p)further promoted its secondary cracking and oxidation,resulting in a decrease in production *** this study,for bituminous coal and lignite,a large amount of coal tar were produced during preheating and the highest production yields could reach 5.74%and 6.15%,*** for anthracite,the production yield was intensely low due to its own coal properties,all below 1.02%.

关键词： self-preheating fuel modification product characteristics coal particle structure coal tar

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Effects of the Secondary Air Excess Ratio on the Self-Preheating Combustion Characteristics and NOx,Emission of Semi-Coke

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Journal of Thermal Science 2023年第3期32卷 1263-1277页

作者： ding hongliang OUYANG Ziqu CAO Xiaoyang ZHU Shujun Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The effects of the secondary air excess ratio(λ_(2))on the self-preheating combustion characteristics and NO_(x)emission of semi-coke have been experimentally studied on a bench-scale test *** combustion of the high-temperature preheated fuel(coal gas&coal char)has been achieved in all experimental *** fire-observation windows,the combustion zone was transparent and no flame fronts were ***,differentλ_(2)in this study were basically within the common range of self-preheating combustion *** results manifested that the rapid ignition of coal gas and the recirculation of high-temperature flue gas resulted in relatively high combustion temperatures close to the secondary air nozzle *** the increase of.12,the unburned carbon content of fly ash increased slightly and combustion efficiencies of all experiments exceeded98%.Moreover,the exit NO_(x)emission was not reduced linearly,which was dissimilar from conventional air staging *** main reason was that the volatile-N was released in the self-preheating device,and the air staging method could not effectively reduce the char-NO_(x).In the course of the experiments,the lowest NO_(x)emission was 64.35 mg/m3(@6%O2)whenλ_(2)was 0.40.

关键词： self-preheating pulverized coal NO emission flameless combustion

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Effects of Interaction between Axial and Radial Secondary Air and Reductive Intensity in Reduction Region on Combustion Characteristics and NO_(x) Emission of Coal Preheated by a Self-Preheating Burner

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Journal of Thermal Science 2024年第1期33卷 249-267页

作者： SU Kun ding hongliang OUYANG Ziqu ZHANG Jinyang ZHU Shujun Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Energy and Power Engineering Jiangsu UniversityZhenjiang 212013China

The study focused on the effects of the interaction between axial and radial secondary air and the reductive intensity in reduction region on combustion characteristics and NO_(x) emission in a 30 kW preheating combustion *** results revealed that the interaction and reductive intensity influenced the combustion in the down-fired combustor(DFC) and NO_(x) emission *** the temperature distribution,the interaction caused the position of the main combustion region to shift down as R_(2-12)(ratio of axial secondary air flow to radial secondary air flow) decreased or λ_(2)(total secondary air ratio) increased,and there was the interplay between both of their *** R_(3-12)(ratio of first-staged tertiary air flow to second-staged tertiary air flow)increased,the decrease in the reductive intensity also caused the above phenomenon,and the peak temperature increased in this *** the NO_(x) emission,the interaction affected the NO_(x) reduction adversely when λ_(2) or R_(2-12) was higher,and the range of this effect was larger,so that the NO_x emission increased obviously as they *** decrease in the reductive intensity caused the NO_(x) emission increased under the homogeneous reduction mechanism,while was unchanged at a high level under the heterogeneous reduction *** the combustion efficiency,the interaction improved the combustion efficiency as λ_(2) increased when R_(2-12) was lower,while reduced it as λ_(2) increased excessively when R_(2-12) was *** proper decrease in the reductive intensity caused the combustion efficiency increased obviously,while was hardly improved further when the intensity decreased *** this study,the lowest NO_(x) emission was only 41.75 mg/m^(3) without sacrificing the combustion efficiency by optimizing the interaction and reductive intensity.

关键词： self-preheating interaction of axial and radial secondary air reductive intensity combustion characteristic NO_(x)emission

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Recent Advances in Flame Retardant Bio-Based Benzoxazine Resins

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Journal of Renewable Materials 2022年第4期10卷 871-895页

作者： hongliang ding Xin Wang Lei Song Yuan Hu State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei230026China

Benzoxazines have attracted wide attention from academics all over the world because of their unique ***,most of the production and preparation of benzoxazine resins depends on petroleum resources now,especially bisphenol A-based ***,owing to the environmental impacts,the development of bio-based benzoxazines is gaining more and more interest to substitute petroleum-based *** to petroleum-based benzoxazines,most of bio-based benzoxazines suffer from ***,it is necessary to endow bio-based benzoxazines with outstanding flame *** purpose of this review is to summarize the latest advance in flame retardant bio-based ***,three methods of the synthesis of bio-based benzoxazines are introduced ***,the curing mechanism of benzoxazine and the effect of branched chains on the curing behavior are also discussed and ***,this review focuses on fully bio-based benzoxazines,partly bio-based benzoxazines,and bio-based benzoxazine composite materials in terms of flame retardancy as well as thermal stability and some other special ***,we give a brief comment on the challenges and prospects of the future development of flame retardant bio-based benzoxazines.

关键词： Bio-based benzoxazine curing mechanism thermal stability flame retardancy

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多途径多方案复核论证丹江口水库设计洪水

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南水北调与水利科技(中英文) 2025年第1期23卷 141-149页

作者：王孟悦郭生练何晓东丁洪亮王伟武汉大学水资源工程与调度全国重点实验室武汉430072 汉江水利水电(集团)有限责任公司武汉430048

丹江口水库初设洪水成果偏大,导致汛期运行水位和蓄满率偏低,无法满足水资源高效利用和生态环境保护的新需求。将丹江口水库坝址洪水系列还原并延长至2023年,重新考证历史调查洪水,构建P-Ⅲ型分布/适线法洪水频率分析模型,拟定5种不同方... 详细信息

丹江口水库初设洪水成果偏大,导致汛期运行水位和蓄满率偏低,无法满足水资源高效利用和生态环境保护的新需求。将丹江口水库坝址洪水系列还原并延长至2023年,重新考证历史调查洪水,构建P-Ⅲ型分布/适线法洪水频率分析模型,拟定5种不同方案,复核计算水库设计洪水;结合汉江流域的古洪水资料和可能最大洪水经验公式的计算结果,通过多途径多方案分析和比较论证,结果表明:丹江口水库设计洪水的复核成果明显偏小;水库坝址千年一遇设计洪水和万年一遇校核洪水分别为56950 m^(3)/s和70000 m^(3)/s,比初设成果减少了27.91%和40.68%;千年一遇年最大7 d洪量比初设成果减少了21亿m^(3),丹江口上游新建水库又增加了17亿m^(3)的防洪库容。因此,建议丹江口水库夏汛期的汛限水位可调整为163 m,在确保防洪安全的前提下提高水资源利用效率和水库蓄满率,充分发挥水库的综合利用效益。

关键词：设计洪水洪水频率分析历史洪水古洪水丹江口水库

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A Novel Bio-Based Zirconium Phosphonate as a Flame Retardant and Smoke Suppressant for Epoxy Resin

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Journal of Renewable Materials 2022年第9期10卷 2303-2317页

作者： Xianling Fu hongliang ding Xin Wang Lei Song Yuan Hu State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei230026China

Although epoxy resin has been widely used in various fields,it still suffers from some problems including brittleness and *** this study,a new phosphonic acid,N,N-bis(phosphomethyl)glycine(GDMP),was prepared by Mannich reaction with bio-based glycine and then a novel layered zirconium phosphonate(ZrGDMP)was synthesized using GDMP and zirconyl chloride hydrate as *** chemical structure of ZrGDMP was well characterized by 1 H and 31P NMR,SEM,XRD and *** effect of ZrGDMP on the flame retardancy,smoke suppression,strengthening and toughening performances of the epoxy matrix was investigated and *** results indicated that compared with pure EP,ZrGDMP-EP composites showed higher char yield due to the catalytic charring effect of *** pure EP exhibited high flammability,while ZrGDMP-EP composites possessed excellent thermal stability and remarkable fire *** PHRR,THR,and TSP values of 3wt%ZrGDMP-EP were obviously declined by 39.6%,40.2%,and 24.9%compared to these of pure ***,the tensile and impact tests implied that the addition of ZrGDMP can significantly reinforce the toughness as well as the strength of EP in terms of higher impact strength(24.8 kJ/m^(2))and tensile strength(57.7 MPa),which was mainly contributed to the uniform dispersion of ZrGDMP within the EP matrix.

关键词： Zirconium phosphonate epoxy resin flame retardant mechanical property

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Superior Latent Heat Eutectic Salt Na_(2)CO_(3)-Li_(2)CO_(3)-LiF for Thermal Energy Storage:Preparation and Performance Investigation

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Journal of Thermal Science 2024年第2期33卷 501-508页

作者： LI Weiwei MIAO Qi ZHANG Yelong ding hongliang YANG Sa LAI Yuan FENG Daili ding Yulong JIN Yi TAN Linghua School of Chemistry and Chemical Engineering Nanjing University of Science&TechnologyNanjing210094China National Special Superfine Powder Engineering Research Center Nanjing University of Science and TechnologyNanjing210094China Nanjing Jinhe Energy Material Co. LtdNanjing210047China School of Chemical Engineering University of BirminghamBirminghamB152TTUK School of Energy&Environmental Engineering University of Science and Technology BeijingBeijing100083China

In this paper,a novel ternary eutectic salt Na_(2)CO_(3)-Li_(2)CO_(3)-LiF was designed and investigated for concentrated solar power(CSP).The FactSage software was used to predict the composition and eutectic point of Na_(2)CO_(3)-Li_(2)CO_(3)-*** microstructure,thermophysical properties,and thermal stability of eutectic salts were experimentally measured using various analytical *** a mass ratio of 57%:32%:11%,the eutectic salt exhibited excellent thermal storage properties with a fusion enthalpy of 413 J/g and a melting point of 426.8℃.The excellent thermal stability of the eutectic salt was reflected by a weight loss of only 0.8% at 600℃.

关键词： phase change materials ternary eutectic salt latent heat thermal stability

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基于自适应模糊PID的建筑移动机器人运动规划与控制方法

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机电工程 2025年第2期42卷 315-326页

作者：张乾坤金睿丁宏亮徐泽铨王伟张海峰邹佳霖浙江建投创新科技有限公司浙江杭州310013 浙江省建设投资集团股份有限公司浙江杭州310013 浙江省建工集团有限责任公司浙江杭州310012 浙江理工大学机械工程学院浙江杭州310018

针对建筑施工现场涉及的越障、攀爬等复杂非结构化场景,为提升机器人的整机性能,提出了一种基于轮履切换的建筑移动机器人。首先,在传统单履带基础上设计了子母履带辅助攀爬机构,基于激光雷达、惯性测量单元等多传感融合的空间定位与建... 详细信息

针对建筑施工现场涉及的越障、攀爬等复杂非结构化场景,为提升机器人的整机性能,提出了一种基于轮履切换的建筑移动机器人。首先,在传统单履带基础上设计了子母履带辅助攀爬机构,基于激光雷达、惯性测量单元等多传感融合的空间定位与建图,利用基于运动学约束的信息树扩展算法对随机环境中的机器人进行了路径规划;然后,建立了含重心偏移、滑移等非线性扰动的运动学和动力学方程,综合考虑了实际作业过程中的强耦合、非线性、建模误差等不确定性因素,设计了一种基于自适应模糊分数阶的PID控制方法;最后,根据仿真分析与实验,验证了机器人的整机灵活性、高可靠性及多场景适应能力。研究结果表明:基于轮履切换的机械结构对复杂场景具有良好的适应能力;路径规划平均缩短路径长度9.08%,缩减行程时间39.83%;控制系统可在保障运动稳定性、动作协调性的同时减小位置误差,实现对机器人的精确控制目的,满足复杂施工环境下机器人的作业需求。

关键词：建筑机器人轮履切换运动控制轨迹规划同时定位与地图构建自适应模糊PID控制

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石墨烯微片/聚丙烯导热复合材料的制备与性能

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复合材料学报 2013年第6期30卷 14-20页

作者：汪文丁宏亮张子宽沈烈浙江大学高分子科学与工程学系高分子合成与功能构造教育部重点实验室杭州310027

通过熔融共混法制备了两种不同型号石墨烯微片(GNPs)填加的GNPs/聚丙烯(PP)导热复合材料,研究了GNPs型号(KNG180,KNG150)和含量对其导热性能、密度、结晶性能和热稳定性能的影响。结果表明,KNG180GNPs/PP复合材料密度高于KNG150GNPs/PP... 详细信息

通过熔融共混法制备了两种不同型号石墨烯微片(GNPs)填加的GNPs/聚丙烯(PP)导热复合材料,研究了GNPs型号(KNG180,KNG150)和含量对其导热性能、密度、结晶性能和热稳定性能的影响。结果表明,KNG180GNPs/PP复合材料密度高于KNG150GNPs/PP,同时KNG180对提高聚丙烯结晶度的效果优于KNG150。随着石墨烯微片含量的增加,两种复合材料导热系数均明显增大,而且KNG180填充的复合材料导热性能明显优于KNG150;当KNG180的添加量为60%(质量分数)时,GNPs/PP复合材料的导热系数从纯聚丙烯的0.087W/(m·K)提高到1.32W/(m·K),提高了14倍多。石墨烯微片的加入显著提高了聚丙烯的热稳定性,当KNG180或KNG150的质量分数为10%时,聚丙烯达到最大热失重速率时的温度从345.1℃分别提高到374.6℃和397.9℃,但是当石墨烯微片超过一定含量时,热稳定性会下降。

关键词：聚丙烯石墨烯微片导热性能结晶性能热稳定性能

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融入创客教育理念提升物理学科核心素养——以“互感与自感”教学为例

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物理教学 2021年第12期43卷 30-32页

作者：丁洪良江苏省丹阳市教师发展中心江苏212300

如何用一节电压为1.5V的干电池点亮工作电压为4V的LED灯,面对这样一个项目任务,刚学完电磁感应相关知识的学生们会有怎样的奇思妙想,本文详细记录了学生们学有所用,创新设计电路并进行制作,最后成功完成目标任务的实践过程。

关键词：互感自感创新实践

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