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Modern Research in Catalysis 2012年第3期1卷 43-51页

作者： Ali Ashour AL-Dhfeery Ala’a Abdulrazaq Jassem Department of Chemical Engineering Basra University Basra Iraq

In this paper, the effect of catalyst shape and characteristics has been investigated where five types of a catalyst were examined under the same operation conditions, where catalysts are similar in the chemical properties (Ni/MgOAl2O3) but it's different in their physical properties in the catalyst section of secondary reformer. The secondary reformer involves continuation of the methane reforming reaction that began in the primary reformer to produce Nitrogen and Hydrogen in the ammonia plant. In order to evaluate performance of various types of catalysts in the secondary reformer reactor, mathematical model have been created. The mathematical model covers all aspects of major chemical kinetics, heat and mass transfer phenomena in the secondary reformer in the ammonia plant at steady state conditions. It aims to optimize the best catalyst from five types of catalyst of the secondary reformer reactor in the State Company of Fertilizers South Region in the Basra/Iraq. The mathematical model allows calculating the axial variations of compositions, temperature and pressure of the gases inside two reactors in series by using the atomic molar balance and adiabatic flame temperature in the combustion section while, in the catalyst section, they are predicted by using a one-dimensional heterogeneous catalytic reaction model. The analysis evaluation performance of the catalyst (RKS-2-7H') have good results than other the catalyst types (RKS - 2, ICI 54 - 2, RKS-2-7H”, RKS-2-7H”’) in catalyst zone of the secondary reformer.

关键词： Fertilizers Autothermal reformer Steam Reforming Catalysis Hydrogen Production

一种采用SVD-reformer的高精度滚动轴承故障诊断方法

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制造业自动化 2024年第9期46卷 33-41,126页

作者：郑直李显泽张华钦王志军刘伟民华北理工大学机械工程学院河北唐山063210 华北电力大学能源动力与机械工程学院北京102206 北京科技大学机械工程学院北京100083

引入reformer对滚动轴承进行故障诊断时,存在精度和效率都很低的问题。针对上述问题,引入了奇异值分解(SVD)方法和全连接层网络对reformer进行了改进处理,提出了一种高精度和高效率的SRFC新方法。首先,利用SVD对所输入长序列信号数据压... 详细信息

引入reformer对滚动轴承进行故障诊断时,存在精度和效率都很低的问题。针对上述问题,引入了奇异值分解(SVD)方法和全连接层网络对reformer进行了改进处理,提出了一种高精度和高效率的SRFC新方法。首先,利用SVD对所输入长序列信号数据压缩成不同的小数据段,并进行消噪处理;其次,利用并行的reformer对上述小数据段进行细节故障特征提取;再次,利用全连接层网络调整上述特征信息大小,并将其融合为一体;最后,将上述特征信息作为输入,利用另一种全连接层网络实现故障诊断。经过实测滚动轴承故障信号分析可知,所提SRFC新方法的精度高达96%,比原算法reformer提高了12.94%,与Transformer相当;所提SRFC新方法的运行时间低至6.36 s,分别比原算法reformer和Transformer降低了95.73%和96.93%。因此,所提SRFC新方法在精度和效率方面具有优越性。

关键词：滚动轴承 reformer 奇异值分解全连接层网络

Three Great reformers of the Roman Army

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Journal of Contemporary Educational Research 2018年第1期2卷 15-20页

作者： Zihao Zhang(John) Duck Pond Road Locust ValleyNY 11560

Rome was famous because of its strong military force and it dominate the Mediterranean ***,it was facing severe shortage of soldiers for a long time during 150 *** problem had enormously effect on the Roman society and political life such as the appearance of slavery in Rome and the use of violence in *** reasons why Rome had shortage f soldiers were related to its own military system and political *** three great reformers,Tiberius Gracchus,Caius Gracchus and Caius Marius tried their best to solve the *** brothers failed but Marius *** we can learn from these reforms will also be mentioned.

关键词： Roman army shortage of soldiers reform and reformer Senate Gracchus brothers Marius experiences

SIMULATION ANALYSIS AND OPTIMIZATION OF STEAM REFORMING PROCESS FOR A LARGE-SCALE AMMONIA PLANT

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Chinese Journal of Chemical Engineering 1995年第4期3卷 40-49页

作者：张述伟俞裕国大连理工大学化学工程所辽宁大连

The present paper shows how the Schuster Schwarzschild method developed originally inastrophysics can be adopted to simulate the performance of the primary reforming furnace in an am-monia *** method facilitates the simulation of heat transfer and reaction in the furnace andimproves the computational *** analysis is carried out to find ways of saving *** reduction in fuel gas loading and partially shifting of the reforming load from theprimary to the secondary reformer by regulating the operating conditions can result in substantial en-ergy *** calculations with various objective functions and constraints required *** optimization results may serve as guideline for plant operation and control.

关键词： simulation optimization energy saving reformer

中央农村工作会议提出：确保今年农业和农村经济稳定增长

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农村财务会计 1997年第3期 4-5页

作者：王伟超

中央农村工作会议提出：确保今年农业和农村经济稳定增长本刊综合新华社消息为期四天的中央农村工作会议１月１３日在京闭幕。会议提出，要再接再厉，乘势前进，确保今年农业增产、农民增收、农村稳定，实现农村经济全面发展和社会全面... 详细信息

中央农村工作会议提出：确保今年农业和农村经济稳定增长本刊综合新华社消息为期四天的中央农村工作会议１月１３日在京闭幕。会议提出，要再接再厉，乘势前进，确保今年农业增产、农民增收、农村稳定，实现农村经济全面发展和社会全面进步。会议期间，江泽民、李鹏、朱基...

关键词： ammonia plant primary reformer mixed fuel catalytic reformer prefractionator overhead fraction burner calculation method

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Hydrogen generation from methanol reforming for fuel cell applications: A review

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Journal of Central South University 2020年第4期27卷 1074-1103页

作者： SUN Zhao SUN Zhi-qiang School of Energy Science and Engineering Central South UniversityChangsha 410083China

Methanol is regarded as an important liquid fuel for hydrogen storage, transportation, and in-situ generation due to its convenient conveyance, high energy density, and low conversion temperature. In this work, an overview of state-of-the-art investigations on methanol reforming is critically summarized, including the detailed introduction of methanol conversion pathways from the perspective of fuel cell applications, various advanced materials design for catalytic methanol conversion, as well as the development of steam methanol reformers. For the section of utilization pathways, reactions such as steam reforming of methanol, partial oxidation of methanol, oxidative steam reforming of methanol, and sorption-enhanced steam methanol reforming were elaborated;For the catalyst section, the strategies to enhance the catalytic activity and other comprehensive performances were summarized;For the reactor section, the newly designed steam methanol reformers were thoroughly described. This review will benefit researchers from both fundamental research and fuel cell applications in the field of catalyzing methanol to hydrogen.

关键词： methanol reforming hydrogen generation fuel cell catalyst reformer

Potential Cracking in Hydrogen Plant with Light Feedstocks (Part II)

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World Journal of Engineering and Technology 2015年第3期3卷 18-25页

作者： Guotai Zhang Sanjeev Sekhri Process Department Technip Stone & Webster Process Technology Inc. Claremont USA

This paper presents the analysis of potential thermal cracking of light feedstocks in the SMR. Two different feedstocks, natural gas and light hydrocarbon (HC) feedstock at two different mixed feed inlet temperatures, are selected to study the HC thermal cracking. Effect of Crossover Piping Volume on feed thermal cracking is also discussed.

关键词： Steam-Methane reformer (SMR) Temperature Index (TI) Mixed Feed Preheater (MFPH) Crossover Piping Volume (CPV) Hydrocarbon (HC) and Thermal Cracking Kinetics

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注意力机制综述

计算机应用 2021年第S01期41卷 1-6页

作者：任欢王旭光华北电力大学自动化系河北保定071003

现在注意力机制已广泛地应用在深度学习的诸多领域。基于注意力机制的结构模型不仅能够记录信息间的位置关系,还能依据信息的权重去度量不同信息特征的重要性。通过对信息特征进行相关与不相关的抉择建立动态权重参数,以加强关键信息弱... 详细信息

现在注意力机制已广泛地应用在深度学习的诸多领域。基于注意力机制的结构模型不仅能够记录信息间的位置关系,还能依据信息的权重去度量不同信息特征的重要性。通过对信息特征进行相关与不相关的抉择建立动态权重参数,以加强关键信息弱化无用信息,从而提高深度学习算法效率同时也改进了传统深度学习的一些缺陷。从图像处理、自然语言处理、数据预测等不同应用方面介绍了一些与注意力机制结合的算法结构,并对近几年大火的基于注意力机制的transformer和reformer算法进行了综述。鉴于注意力机制的重要性,综述了注意力机制的研究发展,分析了注意力机制目前的发展现状并探讨了该机制未来可行的研究方向。

关键词：注意力机制深度学习位置关系信息特征关键信息 transformer reformer