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Investigation of kinetic and thermodynamic parameters of coal pyrolysis with model-free fitting methods

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Carbon Resources Conversion 2020年第1期3卷 173-181页

作者： jingchong yan Qitong yang Li Zhang Zhiping Lei Zhanku Li Zhicai Wang Shibiao Ren Shigang Kang Hengfu Shui School of Chemistry&Chemical Engineering Anhui Province Key Laboratory of Coal Clean Conversion and High Valued UtilizationAnhui University of TechnologyMaanshan 243002Anhui ProvincePR China School of Computer Science and Technology Anhui University of TechnologyMaanshan 243002Anhui ProvincePR China

Kinetic analyses are important means for understanding the complicated coal pyrolysis *** work conducted non-isothermal pyrolysis of four low-medium rank coals with thermogravimetric analyzer at different heating rates(5,10 and 20 K/min).Four model-free fitting approaches including KAS,OFW,Starink and Friedman methods were used to analyze pyrolysis kinetics of the *** parameters including enthalpy(ΔH)Gibbs free energy(ΔG)and entropy(ΔS)were calculated with the activation values(E)obtained with KAS *** the kinetic analysis,the KAS,OFW and Starink methods give close E values over the whole conversion range,but the Friedman method shows more deviant *** thermodynamic favorability of coal pyrolysis is discussed,bothΔH andΔG increase with conversion consistently with the variation of E,revealing that pyrolysis is endothermic and thermodynamic favorability is reduced with conversion *** minusΔS implies that coal structures evolve from disordered to organized ones as universally *** results are expected to deepen our understanding and to optimize the conditions of coal pyrolysis.

关键词： Coal pyrolysis Kinetic analysis Model-free fitting Thermodynamic parameters

Regulation of hydrogen evolution performance of titanium oxide-carbon composites at high current density with a Ti-O hybrid orbital

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Carbon Energy 2022年第3期4卷 480-490页

作者： Meichen Liu Zhiping Lei Qingping Ke Peixin Cui Jiancheng Wang jingchong yan Zhanku Li Hengfu Shui Shibiao Ren Zhicai Wang Ying Kong Shigang Kang Anhui Province Key Laboratory of Coal Clean Conversion and High Valued Utilization Institute of Material Science&EngineeringSchool of Chemistry&Chemical EngineeringAnhui University of TechnologyMa'anshanChina Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceThe Chinese Academy of SciencesNanjingChina Key Laboratory of Coal Science and Technology Ministry of Education and Shanxi ProvinceTaiyuan University of TechnologyTaiyuanChina

Rational design and controllable synthesis of practical electrodes with high sta bility and activity at high current density for a hydrogen evolution reaction(HER)are critical for renewable and sustainable energy ***,high-performance TiO_(2)-based electrocatalysts for HER are quite limited,and the cat alytic active centers still remain ***,a simple strategy is demonstrated for the synthesis of TiO_(2)-carbon composite(TiO_(2)/C)with high HER performance and *** remarkable HER performance of TiO_(2)/C can be ascribed to the doping of carbon atoms,which leads to stronger hybridization of Ti 3d and O 2p orbitals,thus substantially improving the electrocatalytic *** study elucidates that the hydrogen evolution activity of oxide electrocatalysts can be largely improved by regulating their electronic structures by doping carbon atoms and also provides an effective strategy for designing heterostructured electro catalysts with high catalytic activity and stability at high current density for HER.

关键词： C doping HER high current density Ti-O hybridization TiO_(2)/C

Fractionation and characterization of thermal extracts from lignite under ultrasonic-assisted extraction

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Carbon Resources Conversion 2021年第1期4卷 214-218页

作者： Xin Zha Shibiao Ren Tao Jiang jingchong yan Zhicai Wang Zhiping Lei Chunxiu Pan Shigang Kang Zhanku Li Hengfu Shui School of Chemistry and Chemical Engineering Anhui Province Key Laboratory of Coal Clean Conversion and High Valued UtilizationAnhui University of TechnologyMa’anshanAnhui 243002China

Hypercoal(HPC)is promising feedstock for producing coal-based chemicals due to its extremely low ash content and high ***,the conventional methods for HPC preparation through thermal extraction under mechanical stirring are difficult to scale-up due to the low HPC yield and large consumption of *** work conducted ultrasonic-assisted extraction(UAE)instead of mechanical stirring to enhance the efficiency of HPC production,and the effect of technological conditions on the HPC yield were *** was found that the UAE could remarkably enhance the HPC yield from 52.3%to 82.4%.Moreover,the ratio of soluble(HPC-S)to deposit(HPC-D)increased from 1.65 to 2.85,verifying the high efficiency and the capacity of altering the product distribution of UAE.

关键词： Hypercoal UAE Thermal extracts Product distribution

Reduction kinetics of bimetallic copper-based oxygen carries for chemical looping combustion

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Reduction kinetics of bimetallic copper-based oxygen carries...

第四届能源转化化学与技术研讨会

作者： jingchong yan Xiaogang Chu Zhiping Lei Zhanku Li Zhicai Wang Shibiao Ren Hengfu Shui School of Chemistry & Chemical Engineering Anhui Province Key Laboratory of Coal Clean Conversion and High Valued Utilization Anhui University of Technology

Research and development of cheap but efficient oxygen carriers(OC) are crutial for the implementation of chemical looping *** this work,four kinds of copper-based OC, 80 Cu20 Mn,60 Cu40 Co,60 Cu40 Ni and 40 Cu60 Fe,were prepared by the sol-gel *** reduction reaction characteristics with CO at different temperatures were studied by thermogravimetric,and the reduction reaction mechanism,activation energies and preexponential factors were examined obtained through *** the reduction reaction,the reduction processes of 80 Cu20 Mn and 60 Cu40 Co and CO gas follow the shrinking nucleus model,and the integral function is G(X)=1-(1-x).The reduction of 40 Cu60 Fe proceeds through two *** reduction in the first step follows the shrinking geometry(cylindrical symmetry)model with the integral function is G(X)=1-(1-x).The activation energies of 80 Cu20 Mn,60 Cu40 Co and 40 Cu60 Fe are 10.01 kJ/mol, 22.91 kJ/mol and 11.38 kJ/mol,*** to sintering of the 60 Cu40 Ni,its reaction mechanism varies with the rising temperatures,and they cannot be described by the single and simplied model.

关键词： CLOU CLC oxygen carriers kinetics activation energy

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智能化技术在煤矿机电运输中的应用与发展

新疆钢铁 2024年第2期 194-196页

作者：颜井冲兖矿能源赵楼煤矿山东菏泽274700

在煤矿开采活动中机械化运输扮演着关键的角色。它紧密地与煤矿开采的作业效能及安全知识相连。一个高性能的机械输送装置能够确保煤矿开采作业的连续性,降低在生产活动中出现的障碍与意外,增强煤矿的作业效能与防护措施。本项研讨的宗... 详细信息

在煤矿开采活动中机械化运输扮演着关键的角色。它紧密地与煤矿开采的作业效能及安全知识相连。一个高性能的机械输送装置能够确保煤矿开采作业的连续性,降低在生产活动中出现的障碍与意外,增强煤矿的作业效能与防护措施。本项研讨的宗旨是深入分析智能技术在煤矿开采的机电输送领域的运用,目的在于增进该领域的作业效能与安全保障。我们期望借助智能技术的实施得以改进煤矿开采中煤矿机电运输的步骤,增进输送效率,降低故障与意外发生率,为煤矿的安全制造提供技术保障。

关键词：智能化煤矿机电运输

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高碱煤灰渣结渣倾向及过程

洁净煤技术 2023年第7期29卷 140-147页

作者：石文举颜井冲白进曹景沛中国矿业大学江苏省碳资源精细化利用工程研究中心江苏徐州221116 安徽工业大学化学与化工学院安徽马鞍山243002 中国科学院山西煤炭化学研究所煤转化国家重点实验室山西太原030001

结渣是限制高碱煤大规模燃烧利用的关键问题,针对该问题以高碱金属和高碱土金属两类电站锅炉灰渣为研究对象,通过灰熔融温度测试仪、热机械分析仪、热重-示差扫描量热仪、XRD以及热力学软件FactSage系统探究了高碱煤灰渣结渣倾向及结渣... 详细信息

结渣是限制高碱煤大规模燃烧利用的关键问题,针对该问题以高碱金属和高碱土金属两类电站锅炉灰渣为研究对象,通过灰熔融温度测试仪、热机械分析仪、热重-示差扫描量热仪、XRD以及热力学软件FactSage系统探究了高碱煤灰渣结渣倾向及结渣过程。研究发现高碱煤灰渣中碱金属主要以硅铝酸盐存在,而碱土金属主要以硫酸盐存在。高碱金属煤灰渣初始烧结温度高于高碱土金属灰渣,但高碱土金属煤灰渣熔融温度范围大于高碱金属煤灰渣。初始烧结温度与沉积指数均可用于高碱煤灰渣结渣倾向判断,但灰渣化学成分中CaO、K_(2)O+Na_(2)O、SiO_(2)/Al_(2)O_(3)、碱酸比B/A及矿物成分中碱土金属硫酸钙、碱金属硅铝酸盐含量与结渣倾向判别指数间无直接对应关系。高碱煤灰渣的熔融主要经历2个阶段,第1阶段是低熔点碱金属矿物(钠长石、霞石)的熔融或与煤灰中其他矿物反应(石英、白榴石)形成初始液相;第2阶段主要是碱土金属矿物(辉石、钙长石)参与低温共熔反应形成大量液相。

关键词：高碱煤灰渣初始烧结温度灰熔融温度结渣倾向熔融过程

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Corrosion behavior of co-gasification slag of furfural residue and coal on alumina-silica refractories

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燃料化学学报（中英文） 2024年第10期52卷 1387-1397页

作者： MA Xiaotong WANG Zhigang LU Hao LIU Wei WANG yanxia ZHAO Jiangshan SUN Lingmin yan jingchong ZHUANG Shujuan LI Huaizhu KONG Lingxue College of Chemistry and Chemical Engineering Dezhou UniversityDezhou 253023China School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255000China State Key Lab of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China School of Chemistry&Chemical Engineering Anhui University of TechnologyMa’anshan 243002China

Gasification of furfural residue with coal can realize its efficient and clean *** the high alkali metal content in furfural slag is easy to cause the corrosion of gasifier *** gasification coals with different silica alumina ratio and a furfural residue were selected in the *** effects of furfural residue additions on corrosion of silica brick,corundum brick,high alumina brick and mullite brick were investigated by using XRD,SEM-EDS and Factsage Software,and the corrosion mechanism was *** increasing furfural residue addition,the permeability of the slags to high-aluminium-bearing refractories first decreases and then increases,while the permeability on silica brick shows a slight decrease ***(KAlSi_(2)O_(6))with high-melting temperature is generated from the reaction of K_(2)O and SiO_(2)in slag with Al_(2)O_(3)in refractories after furfural residue is added,which hinders the infiltration of slag in ***(KAlSiO_(4))of low-melting point is formed when K_(2)O content increases,and this contributes to the infiltration of slag in *** acid-base reaction between slag and silica brick is distinctly occurred,more slag reacts with SiO_(2)in the silicon brick,resulting in a decrease in the amount of slag infiltrating into the silicon brick as furfural residue is *** corrosion of silica brick is mainly caused by the acid-base reaction,while the corrosion of three alumina based refractory bricks of corundum,mullite and high alumina brick is determined by slag infiltration.A linear correlation between the percolation rate and slag viscosity is established,the slag permeability increases with decreasing viscosity,resulting in stronger permeability for the high Si/Al ratio slag with lower viscosity.

关键词： furfural residue co-gasification slag refractory corrosion

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单点增量成形件残余应力对精度的影响

兵器材料科学与工程 2017年第1期40卷 55-61页

作者：张敬冲李言杨明顺姚梓萌西安理工大学机械与精密仪器工程学院陕西西安710048

为研究单点增量成形件残余应力分布情况以及不同工艺参数对残余应力和轴向精度的影响,对成形材料1050铝进行性能分析。用ABAQUS有限元软件建立单点增量成形圆锥台件三维实体有限元模型,根据模拟结果分析工具头直径D、层间距ΔZ、主轴转... 详细信息

为研究单点增量成形件残余应力分布情况以及不同工艺参数对残余应力和轴向精度的影响,对成形材料1050铝进行性能分析。用ABAQUS有限元软件建立单点增量成形圆锥台件三维实体有限元模型,根据模拟结果分析工具头直径D、层间距ΔZ、主轴转速W和进给速度F对残余应力分布规律的影响,进而分析对轴向精度的影响,并通过实验验证仿真结果的有效性。研究表明:在较小的工具头直径和层间距、合适的主轴转速和较高的进给速度的条件下,可以获得较好的残余应力分布状态和较高的成形件轴向精度。

关键词：残余应力单点增量成形成形精度 ABAQUS

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碳纳米管模板导向制备煤沥青基电热材料及其性能调控研究

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燃料化学学报（中英文） 2024年第3期52卷 405-412页

作者：郭君卓雷智平闫洪雷贾同鑫杨雪李占库颜井冲水恒福任世彪王知彩康士刚安徽工业大学化学与化工学院煤清洁转化与高值化利用省重点实验室安徽马鞍山243002

本研究以煤沥青为原料、多壁碳纳米管为结构导向剂,通过炭化制备了形貌和结构可控的煤沥青基碳膜,考察了多壁碳纳米管对导电填料结构及碳膜电热性能的影响规律。研究发现,多壁碳纳米管掺杂导致导电填料的晶格排列有序度增加、晶格间距... 详细信息

本研究以煤沥青为原料、多壁碳纳米管为结构导向剂,通过炭化制备了形貌和结构可控的煤沥青基碳膜,考察了多壁碳纳米管对导电填料结构及碳膜电热性能的影响规律。研究发现,多壁碳纳米管掺杂导致导电填料的晶格排列有序度增加、晶格间距减小和石墨化程度提高;多壁碳纳米管的引入提高了碳膜的载流子浓度,进而显著提高了其导电性。掺杂2%碳纳米管,可使煤沥青基碳膜的载流子浓度提高3.2倍、电阻降低67%;在5、10和15 V电压下,煤沥青基碳膜的发热温度分别可达44、88和165℃,相对未掺杂碳膜分别提高了7、22和70℃,显示出极大的应用前景。

关键词：煤沥青碳膜碳纳米管模板焦耳电热性能

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