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Influence rule of downtime on heat transfer in converters

Journal of Iron and Steel Research International 2019年第3期26卷 251-258页

作者： Shuai Deng An-jun Xu Rui-yu Yin School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The models for calculating the heat transfer in converters allow the accurate control of heat dissipation caused by downtime,and thus help in crease scrap ratio and reduce energy consumptio *** 17 was used to establish such a model to analyse the coupling law between the downtime and heat dissipation of the converter and the temperature drop of molten *** was measured by infrared detection,and model accuracy was verified by comparative *** variation law of the amount of cold charge added for different downtimes under different process conditions was *** results show that the range of the variation of heat dissipation caused by downtime is 8.9-78.5 *** the downtime increases by 30 min,heat dissipation of dephosphorisation(deP)and decarburisation(deC)converters increases by about 23.4 and 41.3 GJ,*** a certain smelting cycle,the temperature drop of the molten iron for deP,deC and conventional converters increases by about 12.5,15.0 and 17.0 K,respectively;and the amount of scrap added in the double-linking and conventional smelting processes decreases by 0.93 and 0.75%,respectively.

关键词： downtime Converter heat dissipation Scrap ratio Temperature field Finite element

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Preliminary Assessment of Operational downtime of Sea Ports and Berthing Facilities through Numerical Modelling

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Journal of Shipping and Ocean Engineering 2014年第5期4卷 117-128页

作者： Md Akhtaruzzaman Sarker Giang Vu Luong Alec John Sleigh Rivers Deltas & Coasts Business Line Royal Haskoning DHV Peterborough PE3 8DW United Kingdom

downtime due to adverse wave conditions for vessels at berth is an important commercial aspect in the planning and development of a sea port or a berthing terminal. This paper describes a practical technique for preliminary assessment of operational downtime at a proposed bulk terminal. Time-series wind and wave data at an offshore location was purchased. Numerical modelling was then carried out using the MIKE21 SW （spectral wave） model developed by DHI （Deutsches Hydrographisches Institut） to transform these offshore waves into inshore in order to derive wave conditions at the berth. Both wind-waves and swell-waves were considered. Waves affecting the head and beam of a vessel were considered separately for a wide range of vessel sizes with DT （displacement tonnage） ranging from 5,000 tons to 〉 200,000 tons. The limiting wave height H5% was used. Operational downtime was also calculated using significant wave height, Hs as a criterion with limits ofHs = 1.0 m for beam seas and Hs = 1.5 m for head seas. The methodology and lessons learnt from the study can be applied for the development of any sea port worldwide.

关键词： Numerical modelling wave propagation wave transformation downtime port planning bulk terminal.

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The Recording and Analysis of downtime in Processing Enterprises

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International Journal of Plant Engineering and Management 1999年第2期4卷 454-460页

作者： ZHAO Song-zheng LI Gui-hua ZHANG Dian-gu(School of Management, Northwestern Polytechnical University, Xi’an 710072, China)

The paper discusses the importance of recording and analyzing downtime in processing enterprises, and takes Shanghai Mila Brew Company Limited as the example to analyze the problems in recording and analyzing downtime... 详细信息

关键词： Processing enterprises downtime recording and analysis non-planned stops

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Dynamic trip point categorisation using manufacturing process for polycrystalline diamond compact bits as case study

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Journal of Control and Decision 2022年第3期9卷 311-321页

作者： Zubair Ahmad Khan Khalid Khan Shuja Ahmad Khan Shahbaz Khan Muhammad Tufail Abdel Nasser Mechatronics Department University of Engineering and Technology PeshawarPeshawarPakistan Materials for Energy Storage and Conversion US Pakistan Centre for Advanced Studies in Energy University of Engineering and Technology PeshawarPeshawarPakistan Bakar Hughes HoustonGermany Jacobs DallasTXUSA

Disruptions in the manufacturing process cast substantial impacts on the consumer’s centric values,cost,and overall *** ripple effect of these disruptions is observed in the whole assembly *** proper analysis and mitigation of disruptions is the key to the proficiency of the plant and resource *** research focuses on the quantitative analysis of the impact of disruptions of the manufacturing process,which is performed by analysing the disruptive workstation *** disruptive workstations have a significant impact on succeeding and preceding workstations,which have been analysed dynamically,and accordingly,the preset alarm trip points are *** results show that lowering the number of starts and stops decreases the number of rejections of valuable process batches that finally improve ***,the developed model is implemented on a polycrystalline diamond compact drill bit manufacturing *** results are compared with the research work of other researchers,showing a 60%reduction in the number of start/stop events,60%reduction in downtime,while a 75%reduction in the number of rejections is noted.

关键词： Disruptions dynamic assessment downtime alarm tripoints

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Some Reliability Problems Arising in the M^x/G(M/G)/1 Repairable Queueing System with Single Delay Vacation

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Journal of Systems Science and Systems Engineering 2001年第3期13卷 306-314页

作者： TANG Ying-hui Department of Applied Math., University of Electronics Science & Technology of China, Chengdu 610054, China Department of Applied Math. University of Electronics Science & Technology of China Chengdu 610054 China

On the basis of Ref.\, the M x/G(M/G)/1 repairable queueing system with single delay vacation is discussed again. The following reliability problems of the service station are studied: (a) The probability that it fails at time t , i.e. its unavailability; (b) The expected failure number during the time interval (0,t\];; (c) The expected failure number during the ″server busy period″; (d) The expected downtime during the time interval (0,t\]. Some reliability results of the service station are obtained. These results would be interest to reliability analysts.

关键词： repairable vacation service station unavailability failure number downtime

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