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Flexibility analysis and design of heat exchanger network for syngas-to-methanol process

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International Journal of Coal Science & Technology 2021年第6期8卷 1468-1478页

作者： jinchang liu Pingping Zhang Qiang Xie Dingcheng Liang Lei Bai School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)D11 Xueyuan RoadHaidian DistrictBeijing 100083China Department of Chemical and Biomedical Engineering West Virginia University395 Evansdale DrivePO Box 6102MorgantownWV 26506-6102USA

The heat exchanger network(HEN)in a syngas-to-methanol process was designed and optimized based on pinch technology under stable operating conditions to balance the energy consumption and economic *** actual industrial processes,fluctuations in production inevitably affect the stable operation of HENs.A flexibility analysis of the HEN was carried out to minimize such disturbances using the downstream paths *** results show that two-third of the downstream paths cannot meet flexibility requirements,indicating that the HEN does not have enough flexibility to accommodate the disturbances in actual production.A flexible HEN was then designed with the method of dividing and subsequent merging of streams,which led to 13.89%and 20.82%reductions in energy consumption and total cost,*** to the sufficient area margin and additional alternative heat exchangers,the flexible HEN was able to resist interference and maintain production stability and safety,with the total cost increasing by just 4.08%.

关键词： Heat exchanger network Syngas-to-methanol Pinch technology Flexibility analysis Design Optimization

Preparation of pitch precursor with excellent spinnability for general-purpose carbon fibre using coal tar pitch as raw material

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Chinese Journal of Chemical Engineering 2023年第2期54卷 22-28页

作者： jinchang liu Chenyang Shen Lujie Huang Tinghao Fang Yaping Li Dingcheng Liang Qiang Xie School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing 100083China

Tetrahydrofuran(THF) extract of coal tar pitch(CTP) was used instead of blending CTP with pretreated pyrolysis fuel oil to prepare an isotropic pitch precursor with excellent spinnability for general-purpose carbon fibre through bromination-dehydrobromination. The feasibility and effectiveness of synthesising an isotropic pitch precursor derived from THF-soluble(CTP-THFs) is demonstrated in this *** results show that CTP-THFs contains more light components than CTP;CTP-THFs and CTP monomer proportions were 62.52% and 45.32%, respectively. However, based on comparisons of CTP-THFsBr0 and CTPBr0 characterisations, CTP-THFs exhibits better polycondensation than CTP. Bromination-dehydrobro mination promotes polycondensation of pitch precursors, leading to greater carbon aromaticity in CTP-THFsBr5, CTP-THFsBr10, and CTP-THFsBr15 than that in CTP-THFsBr0 and CTPBr0. CTP-THFsBr5 and CTP-THFsBr10 have excellent spinnability even with softening points as high as 230 ℃. The pericondensed carbon and carbon aromaticity of CTP-THFsBr5 and CTP-THFsBr10 are high owing to the higher degree of polycondensation;however, they still possess a more linear molecular structure. The as-prepared carbon fibre exhibits homogeneity and uniformity, and the mechanical performance is comparable with that of commercial general-purpose carbon fibre products.

关键词： Carbon fibre Isotropic pitch Coal tar pitch(CTP) High spinnability Bromination–dehydrobromination

Preparation and modification of activated carbon for benzene adsorption by steam activation in the presence of KOH

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International Journal of Mining Science and Technology 2013年第3期23卷 395-401页

作者： Yao Xin liu jinchang Gong Guozhuo Jiang Yu Xie Qiang School of Chemical and Environmental Engineering China University of Mining & Technology Beijing Institute of Labor Protection Science Datong Coal Mine Group Company

A series of activated carbons from Taixi anthracite were prepared by steam activation in the presence of KOH and then they were modified by different methods. The regulation of porosity and the modification of surface chemistry were carried out with the aim to improve the benzene adsorption capacity of activated carbon. The influences of KOH and activation process parameters including activation temperature, activation time and steam flow rate on porosity of activated carbon were evaluated, and the effect of modification methods on surface chemistry was investigated. Also, the relationship between benzene adsorption capacity and porosity and surface chemistry was analyzed. Results show that activation temperature is the dominant factor in the activation process; the introduction of KOH into the raw material can enhance the reactivity of char in activation process, meanwhile it shows a negative effect on the porosity development, especially on the mesopore development. Results of FTIR analysis indicate that anthracite-based activated carbon with condensed aromatics and chemically inert oxygen does not present the nature to be surface modified. Besides, benzene adsorption capacity has an approximate linear relationship with surface area and in our preparation, benzene adsorption capacity and surface area of activated carbon are up to 1210 m 2 /g and 423 mg/g, respectively.

关键词： Activated carbon Steam activation Surface modification Benzene Potassium hydroxide

Design of trotting controller for the position-controlled quadruped robot

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High Technology Letters 2016年第3期22卷 321-333页

作者：张国腾 liu jinchang Rong Xuewen Li Yibin Chai Hui Li Bin Zhang Hui Zhang Shuaishuai School of Control Science and Engineering Shandong University High Technology Research Development Center Ministry of Science and Technology of the People's Republic of China

This work presents a controller designed for position-controlled quadrupedal dynamic locomotion,aiming at simple and robust trotting control. The controller takes the torso attitude angles and velocities into planning foot trajectories. Firstly design of the servo motor actuated quadruped robot is introduced and the kinematic equations are deduced. Then a scheme is presented for controlling the robot torso attitude based on the virtual leg model. Furthermore,it demonstrates the design of the controller which enables the robot to have a wide range of trotting gaits and omni-directional motions. Finally,results of robust trotting in various speeds,path tracking and push recovery in simulation are reported,and results of trotting on real quadruped robots will be studied.

关键词： quadruped robot position control torso attitude foot trajectory trotting locomotion

Building of a ton-scale liquid argon prototype detector

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Radiation Detection Technology and Methods 2024年第2期8卷 1120-1130页

作者： Kangkang Zhao Mengyun Guan Qin Zhao Zhongtao Shen Peng Zhang jinchang liu Changgen Yang Lei Wang Zeyuan Yu Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Beijing100049China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei230026China College of Physics Sichuan UniversityChengdu610065China

Background Based on the unique PSD characteristic which essentially relies on the detector light yield,liquid argon detector is widely used for dark matter searching *** experimental study of how to get larger light yield for a ton-scale liquid argon detector is worth to be carried *** A ton-scale liquid argon prototype detector is built to check the detector implementation as well as the light collection *** A ton-scale single-phase liquid argon prototype detector is built in the surface laboratory for scalable detector construction *** detector adopts the classical spherical arrangement mode to obtain a large PMT photocathode ***-two PMTs are immersed in the liquid argon,and polymer materials are used to construct the PMT supporting *** about 2.2 tons of liquid argon is used,of which about 160 kg is the active *** this paper the details of the experiment as well as the detector performance are *** Experiment results show that the light yield reaches 6.3 PE/keV,with an effective photon collection efficiency of 74.3%achieved.

关键词： Liquid argon detector Purity Light yield PMT

Thermodynamic Study on the Adsorption of Nickel ion onto Activated Carbons

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Thermodynamic Study on the Adsorption of Nickel ion onto Act...

中国材料大会2012

作者： Juan liu jinchang liu Xin Yao Qiang Xie School of Chemical and Environmental Engineering China University of Mining and Technology （Beijing）

ISBN: (纸本)9783037856062;3037856068

The adsorption isotherms and kinetics of nickel ion onto commercial activated carbons were determined and investigated under different temperature and initial pH in solution. The pore size distribution, specific surface area and functional groups of activated carbons were characterized by N 2 adsorption isotherms and Boehm titration. The results showed that the nickel ion adsorption property of activated carbon from precursors including anthracite, long flame coal, lignite and coconut were 4.9, 3.4, 4.1, 5.2mg/g, respectively. There was no obvious correlation with surface area, total volume or surface functional group value. The nickel ion adsorption isotherms and kinetics fitted the Langmuir isotherm and pseudo-second-order model very well. The adsorption was a spontaneous endothermic process, in which the adsorption took place primarily due to the ion-exchange action in low concentration of 50mg/L. On the other hand, the adsorption depended on the physical adsorption when the concentration≥100mg/L. The nickel ion adsorption capacity was highly affected by solution pH, and the optimum initial pH ranged was from 4 to 7.

关键词： Activated carbon Nickel ions Adsorption isotherm Kinetics Thermodynamic.

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基于博弈论的多传感器交叉提示算法

系统工程与电子技术 2017年第8期39卷 1684-1690页

作者：庞策黄树彩刘锦昌赵炜空军工程大学防空反导学院陕西西安710051

针对传感器交叉提示技术在目标探测中的应用问题展开研究,首先介绍多传感器交叉提示技术基本理论,建立了具有社区性的传感器网络模型和基于多Agent技术的分布式传感器管理结构,分析了传感器交叉提示发生的条件和类型,其次提出了传感器... 详细信息

针对传感器交叉提示技术在目标探测中的应用问题展开研究,首先介绍多传感器交叉提示技术基本理论,建立了具有社区性的传感器网络模型和基于多Agent技术的分布式传感器管理结构,分析了传感器交叉提示发生的条件和类型,其次提出了传感器网络效能评价函数,最后设计了基于博弈论的多传感器交叉提示算法。仿真结果表明,提出的多传感器交叉提示模型符合实际作战场景,能够生成传感器联盟方案对目标检测和跟踪,并进行目标交接,与拍卖算法和人工蜂群算法相比,博弈论算法求解质量较高,收敛速度明显提高,更适用于作战态势较紧急的情形。

关键词：多传感器交叉提示博弈论目标检测目标跟踪目标交接

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煤系通用型碳纤维的制备与研究

煤炭科学技术 2021年第2期49卷 254-261页

作者：刘金昌杨帅解强梁鼎成中国矿业大学(北京)化学与环境工程学院北京100083

与聚丙烯腈基碳纤维和中间相沥青基碳纤维相比,通用型碳纤维具有突出的价格优势,但较差的强度性能限制其只能应用在建筑补强等低附加值领域。因此,在控制通用型碳纤维制备成本的同时提高其强度性能从而拓宽其应用领域已然成为研究热点... 详细信息

与聚丙烯腈基碳纤维和中间相沥青基碳纤维相比,通用型碳纤维具有突出的价格优势,但较差的强度性能限制其只能应用在建筑补强等低附加值领域。因此,在控制通用型碳纤维制备成本的同时提高其强度性能从而拓宽其应用领域已然成为研究热点。迄今,原料选择与调整以及沥青前驱体合成方法的改进被认为是解决上述问题的极具潜力的途径。煤加工过程中副产的煤焦油等产品是制备通用型碳纤维的重要原料。结合我国能源结构特点,研发与优化煤系通用型碳纤维的制备方法和技术对我国碳纤维行业的发展具有重要意义。以煤系通用型碳纤维的制备研究为主旨,首先从原料的角度讨论了煤系原料的种类、前处理方法、性质与特点以及在用于通用型碳纤维制备过程中优缺点;此外,详细论述了通用型碳纤维的制备方法,包括热缩聚法、共炭化法、加氢聚合法和卤化-脱卤化法。未来的煤系通用型碳纤维的研究开发工作应该多集中于如何从分子层面实现沥青前驱体的可控合成,从而提高碳纤维的强度性能,而不应该再仅关注简单地改变原料比例和调整反应条件。

关键词：通用型碳纤维煤沥青前驱体煤焦油

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青海某微细粒嵌布磁铁矿选矿试验研究

金属矿山 2009年第6期38卷 52-55页

作者：刘金长酒泉钢铁(集团)有限责任公司钢铁研究院

为开发利用青海某微细粒嵌布磁铁矿,对其进行了选矿试验研究。试验结果表明:采用单一磁选工艺,即使将矿石细磨至-500目95%,也不能使精矿铁品位达到60%以上。而采用磁选—反浮选联合工艺,在最终磨矿细度为-400目80%时,可获得精矿品位为60... 详细信息

为开发利用青海某微细粒嵌布磁铁矿,对其进行了选矿试验研究。试验结果表明:采用单一磁选工艺,即使将矿石细磨至-500目95%,也不能使精矿铁品位达到60%以上。而采用磁选—反浮选联合工艺,在最终磨矿细度为-400目80%时,可获得精矿品位为60.11%,铁回收率为60.20%的选别指标;在最终磨矿细度为-400目95%时,可获得精矿铁品位为67.42%,铁回收率为56.92%的选别指标。

关键词：微细粒嵌布磁铁矿磁选反浮选