检索结果-南通市图书馆

China Petroleum Processing & Petrochemical Technology 2016年第3期18卷 1-6页

作者： meng zhaohui Yang Tao Fang Xiangchen SINOPEC Fushun Research Institute of Petroleum and Petrochemicals Fushun 113001

A new hydrotreating technology integrating the ebullated-bed(EB) and the fixed-bed(FB) hydrogenation was proposed to investigate the efficiency for hydrotreating mid- low-temperature coal tar to clean fuel, and multiple tests at the bench scale were carried out. The results showed that the distillates obtained from EB reactors were greatly upgraded and could meet the requirements of FB unit without discarding any tail oil. The naphtha produced from FB reactors could be fed to the catalytic reforming unit, while a high quality diesel was also obtained. The unconverted oil(UCO) could be further hydrocracked to clean fuel. It is found that the removal of impurities from the coal tar oil is related with the molecular aggregation structure and composition of the coal tar. Application of the integrated hydrotreating technology to the hightemperature coal tar processing demonstrated that more than half of heavy components could be effectively upgraded.

关键词： coal tar ebullated bed fixed bed integrated hydrotreating

INJURY TO THE MIDDLE EAR DUE TO HIGH-INTENSITY SOUND

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Acoustics 1989年第1期8卷 65-71页

作者： meng, zhaohui Mingkun, Cheng Shen, Hao Beijing Inst of Otorhinolaryngology China

In recent ten odd years, numerous experiments have been made on animals with high impulse noise and high - intensity continuous broadband noise, respectively. Subsequently a series of observations on human ears expose... 详细信息

关键词： Acoustic Wave Effects Health Care

煤焦油重组分沸腾床加氢处理过程中的结构变化

在线全文

学校读者我要写书评

暂无评论

石油炼制与化工 2024年第7期55卷 106-110页

作者：孟兆会赖佳新刘玲杨涛中石化(大连)石油化工研究院有限公司辽宁大连116045

在沸腾床加氢中型试验装置上开展了中温煤焦油加氢预处理试验,并对中温煤焦油原料沥青和加氢尾油进行了核磁共振氢谱(^(1)H-NMR)测试,考察了中温煤焦油重组分在沸腾床加氢预处理过程中的结构变化。结果表明:与原料沥青相比,加氢尾油平... 详细信息

在沸腾床加氢中型试验装置上开展了中温煤焦油加氢预处理试验,并对中温煤焦油原料沥青和加氢尾油进行了核磁共振氢谱(^(1)H-NMR)测试,考察了中温煤焦油重组分在沸腾床加氢预处理过程中的结构变化。结果表明:与原料沥青相比,加氢尾油平均分子的总碳数和平均侧链长度降低;由于芳香环饱和生成环烷环,加氢尾油的芳环数降低、环烷环数增加;由于部分芳环发生加氢-开环裂化反应和环烷环发生开环反应,加氢尾油平均分子的总环数降低;反应温度越高,上述重组分分子结构变化趋势越明显。在试验温度范围内,加氢尾油的芳环缩合参数(H_(AU)/C_(A))随反应温度的升高呈先增大后减小的趋势,为避免稠环芳烃缩合、减少轻烃生成,应控制煤焦油沸腾床加氢预处理的反应温度不超过(基准+20)℃。

关键词：中温煤焦油沸腾床核磁共振分子结构

Reaction Process of Heavy Hydrocarbons Hydrogenation in Ebullated Bed

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2021年第4期23卷 113-120页

作者： Wang Jianjun Tong Yujun Yang Tao Ge Hailong meng zhaohui Lanzhou University of Technology Lanzhou 730050 SINOPEC Dalian Research Institute of Petroleum and Petrochemicals Dalian 116100

The properties and structural changes of unconverted oil(UCO)obtained from ebullated bed hydrogenation at different residue conversion rates were analyzed to clarify the reaction process of heavy components.Meanwhile,the processing routes of UCO,delayed coking,and solvent deasphalting,were investigated.The results showed that with the increase of conversion,the impurity removal rate increased;meanwhile the contents of sulfur and metal in UCO decreased,while the contents of nitrogen and residual carbon increased,and the colloidal stability of UCO became worse.The structural parameters of UCO indicated that the change in molecular structure of heavy oil mainly covered the opening of cycloalkanes ring,hydrogenation saturation of aromatic rings and dealkylation reaction during hydrogenation in the ebullated bed;the aromatic structure was basically unchanged at high conversion,and was mainly due to the ring opening of cycloalkanes and the fracture reaction of alkyl side chains.The coking route of UCO showed that low sulfur petroleum coke with different grades could be prepared by adjusting the conversion in ebullated bed to produce UCOs with different properties.The coke generating coefficient and sulfur transfer coefficient in UCO coking process were higher than those in residue coking.The properties of deasphalted oil(DAO)of UCO were significantly improved and could be used as FCC or hydrocracking feedstock.The DAO yield of UCO feedstock at high conversion was higher,and its sulfur content was lower and CCR value was higher.

关键词： ebullated bed residue hydrogenation residue conversion rate structural parameters low sulfur petroleum coke solvent deasphalting

低渗透油田合理间抽制度确定及其应用效果分析

在线全文

学校读者我要写书评

暂无评论

石油石化节能与计量 2024年第5期14卷 11-15页

作者：孟昭辉大庆油田有限责任公司第十采油厂黑龙江省大庆市163318

针对A油田低品位区块抽油机井常年存在液量不足、举升能耗高、系统效率低的问题,针对人工间抽和不停机间抽两种间抽方式,形成两种间抽方式运行制度模板和间抽参数控制模板,确定了抽油机井合理的停抽和启抽时间,有效避免“干抽”现象。... 详细信息

针对A油田低品位区块抽油机井常年存在液量不足、举升能耗高、系统效率低的问题,针对人工间抽和不停机间抽两种间抽方式,形成两种间抽方式运行制度模板和间抽参数控制模板,确定了抽油机井合理的停抽和启抽时间,有效避免“干抽”现象。区块实施人工间抽井2623口,间抽比例达89.0%;不停机间抽井1982口,占间抽井的75.6%。统计区块3口典型井,转间抽摇摆10 min正常运转20 min,实现平均单井日节电量18 kWh。间抽前后产液量保持稳定,抽油机采油能耗降低,碳排放量减少,抽油井采油效益得到提高,为油井经济开采提供关键技术与管理思路。

关键词：间抽采油合理间抽制度低渗透油田间抽技术优化沉没度

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

沸腾床渣油加氢工艺及模拟综述

当代化工 2024年第4期53卷 966-973页

作者：王涵孟兆会陈博中石化(大连)石油化工研究院有限公司辽宁大连116045

总结归纳了沸腾床渣油加氢反应器的主要特点以及建模方法,讨论了影响渣油加氢各组分收率的主要因素,如沉积物形成、催化剂磨损、催化剂失活等。沸腾床渣油加氢流程的数学建模由以下几部分组成,分别是反应动力学、流体力学、反应器模拟... 详细信息

总结归纳了沸腾床渣油加氢反应器的主要特点以及建模方法,讨论了影响渣油加氢各组分收率的主要因素,如沉积物形成、催化剂磨损、催化剂失活等。沸腾床渣油加氢流程的数学建模由以下几部分组成,分别是反应动力学、流体力学、反应器模拟。经过文献调研整理,发现目前只有少数文献对沸腾床渣油加氢流程建模进行总结,而没有全面总结阐述沸腾床渣油加氢过程以及其模型方程。因此,针对沸腾床渣油加氢流程以及建模过程的详细总结十分必要。

关键词：沸腾床渣油加氢模拟

The influence of inter-band rock on rib spalling in longwall panel with large mining height

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2024年第4期34卷 427-442页

作者： Jiachen Wang meng Li zhaohui Wang Zheng Li Han Zhang Shixiong Song School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China Coal Industry Engineering Research Center of Top-coal Caving Mining Beijing 100083China Faculty of Engineering Hokkaido UniversitySapporo 060-8628Japan

In order to improve rib stability,failure criteria and instability mode of a thick coal seam with inter-band rock layer are analysed in this study.A three-dimensional mechanical model is established for the rib by considering the rock layer.A safety factor is defined foy the rib,and it is observed that the safety factor exhibits a positive correlation with the thickness and strength of the inter-band rock.A calculation method for determining critical parameters of the rock layer is presented to ensure the rib stability.It is revealed that incomplete propagation of the fracture at the hard rock constitutes a fundamental prerequisite for ensuring the rib stability.The influence of the position of the inter-band rock in the coal seam on failure mechanism of the rib was thoroughly investigated by developing a series of physical models for the rib at the face area.The best position for the inter-band rock in the coal seam is at a height of 1.5 m away from the roof line,which tends to provide a good stability state for the rib.For different inter-band rock positions,two ways of controlling rib by increasing supports stiffness and flexible grouting reinforcement are proposed.

关键词： Rib spalling Inter-band rock Large mining height Limit analysis Physical model experiment Numerical simulation

适应炼油厂转型发展的沸-固复合床渣油加氢技术开发

在线全文

学校读者我要写书评

暂无评论

炼油技术与工程 2024年第6期54卷 9-12页

作者：生青青韩坤鹏时一鸣朱慧红孟兆会杨涛中石化(大连)石油化工研究院有限公司辽宁省大连市116045

为适应炼油厂转型发展需求,依托S-RHT固定床渣油加氢技术和STRONG沸腾床渣油加氢技术,中石化(大连)石油化工研究院有限公司开发了沸-固复合床渣油加氢技术。该技术采用单台沸腾床反应器承担原料预处理功能,大大改善了固定床进料性质,多... 详细信息

为适应炼油厂转型发展需求,依托S-RHT固定床渣油加氢技术和STRONG沸腾床渣油加氢技术,中石化(大连)石油化工研究院有限公司开发了沸-固复合床渣油加氢技术。该技术采用单台沸腾床反应器承担原料预处理功能,大大改善了固定床进料性质,多台固定床反应器承担深度加氢精制功能,可明显提升加氢产品质量。中试试验结果表明:经过沸腾床反应器加工,劣质渣油原料金属(镍+钒)质量分数由123.1μg/g降低至38.9μg/g,后经过固定床反应器加工,金属质量分数降至8.8μg/g,加氢脱金属率达92.85%;该原料经过沸-固复合床加氢处理后氢质量分数增加1.58百分点,加氢脱硫率达到90.69%,加氢脱残炭率达到70.30%,加氢脱氮率达到53.73%,沥青质转化率达到82.87%。沸-固复合床渣油加氢技术实现了重质渣油的深度加氢转化,充分发挥了沸腾床和固定床加氢工艺各自的优势,可为后续加工装置提供优质进料。

关键词：沸-固复合床渣油加氢 S-RHT 固定床 STRONG 沸腾床加氢生成油氢含量

Ratiometric fluorescence probe for accurate detection of Concanavalin A by coupling fluorescent microsphere with boric acid functionalized carbon dots

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第2期35卷 460-463页

作者： Mingyue Xie Juan Chen Yufei Wang Bojun Liu Rong-Bin Song Hong-Min meng zhaohui Li College of Chemistry Institute of Analytical Chemistry for Life ScienceHenan Joint International Research Laboratory of Green Construction of Functional Molecules and their Bioanalytical ApplicationsZhengzhou UniversityZhengzhou 450001China Zhengzhou Key Laboratory of Forensic Science and Technology Railway Police CollegeZhengzhou 450053China School of Ecology and Environment Zhengzhou UniversityZhengzhou 450001China

Accurate and sensitive strategies for Concanavalin A(Con A)sensing are conducive to the better cognition of various important biological and physiological processes.Here,by designing dextran-functionalized fluorescent microspheres(DxFMs)and boric acid-modified carbon dots(BCDs)as recognition unit and built-in signal reference respectively,a ratiometric fluorescent detection platform was proposed for Con A detection with high reliability.In this protocol,the BCDs/DxFMs precipitation was formed due to the covalent interactions between cis-diol of DxFMs and boronic acid groups of BCDs,thus only fluorescence of BCDs could be detected in the supernatant.When Con A was presented,it could bind to DxFMs through its carbohydrate recognition ability and suppress the subsequent assembly between DxFMs and BCDs,leading to the simultaneous capture of DxFMs and BCDs fluorescence in the supernatant.Since the BCDs content was superfluous,their fluorescence intensities were basically constant in all cases.Based on the unchanged BCDs fluorescence signal and target-dependent DxFMs fluorescence signal in supernatant,the ratiometric detection of Con A was realized.Under optimized conditions,this ratiometric fluorescent platform displayed a linear detection range from 0.125μg/mL to 12.5μg/mL with a detection limit of 0.089μg/mL.Moreover,satisfied analytical outcomes for Con A detection in serum samples were obtained,manifesting huge application potential of this ratiometric fluorescent platform in clinical diagnosis.

关键词： Concanavalin A Fluorescent microspheres Carbon dots Ratiometric fluorescent assay Reliability

Optimal impulsive rendezvous for highly elliptical orbits using linear primer vector theory

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第3期37卷 194-207页

作者： Maozhang ZHENG Jianjun LUO zhaohui DANG National Key Laboratory of Aerospace Flight Dynamics Northwestern Polytechnical UniversityXi’an 710072China

In this paper,minimum-fuel rendezvous is investigated for the case in which the reference orbit is highly elliptic.To this end,the well-known Tschauner-Hempel equations are used to describe the relative motions between rendezvous spacecraft and the target.Lawden’s primer vector theory is then applied on this linear but time-varying system.The analytical solution of the required primer vector for this problem is then derived by using a recently developed method.For the existing non-optimal solutions which don’t satisfy the conditions,the methods are further designed to improve the performance by shifting impulses or adding a new one.Finally,two algorithms are developed for free-impulse time-fixed rendezvous problems.The first algorithm can determine the globally optimal trajectory with the optimal number of impulses.The second one enables for fast trajectory planning.The proposed algorithms have been successfully applied to coplanar and three-dimensional rendezvous problems in which the target is flying on highly elliptical orbits.

关键词： Orbital transfer Optimal trajectory Primer vector Tschauner-Hempel equations Globally planning Fast planning