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全球炼油化工产业发展新态势及启示 被引量:2
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作者 徐海丰 王婧 《国际石油经济》 2023年第4期37-45,共9页
截至2022年末,全球炼油能力达到51.2亿吨/年,乙烯产能规模达到2.2亿吨/年,全球炼化产能规模快速扩张并加快向东半球集中。全球炼油产品与化工品需求前景分化,油品需求逐渐转弱,化工品需求将成为未来石油需求增长的主要驱动力。全球化工... 截至2022年末,全球炼油能力达到51.2亿吨/年,乙烯产能规模达到2.2亿吨/年,全球炼化产能规模快速扩张并加快向东半球集中。全球炼油产品与化工品需求前景分化,油品需求逐渐转弱,化工品需求将成为未来石油需求增长的主要驱动力。全球化工产业利润疲弱,高端化工产品和材料利润较为稳定并保持在较高水平。地缘冲突引发全球炼化产品贸易流向重塑。全球炼化行业低碳发展和转型升级加快。随着油品需求逐渐萎缩,部分炼油产能未来将面临风险;全球基础化工品供大于求显现,对行业带来负面效应;碳排放权交易价格上升将显著提高炼化企业成本。中国炼化行业应加快行业调整和转型升级,降低成本,拓宽出口渠道,打造更高附加值的炼化产业链,构建新型现代炼化体系,推进炼化产业高质量发展。 展开更多
关键词 炼化产业 炼油能力 油品需求 化工品需求 低碳转型
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Optimization of assembly line balancing using genetic algorithm 被引量:6
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作者 N.Barathwaj P.Raja S.Gokulraj 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第10期3957-3969,共13页
In a manufacturing industry, mixed model assembly line(MMAL) is preferred in order to meet the variety in product demand. MMAL balancing helps in assembling products with similar characteristics in a random fashion. T... In a manufacturing industry, mixed model assembly line(MMAL) is preferred in order to meet the variety in product demand. MMAL balancing helps in assembling products with similar characteristics in a random fashion. The objective of this work aims in reducing the number of workstations, work load index between stations and within each station. As manual contribution of workers in final assembly line is more, ergonomics is taken as an additional objective function. Ergonomic risk level of a workstation is evaluated using a parameter called accumulated risk posture(ARP), which is calculated using rapid upper limb assessment(RULA) check sheet. This work is based on the case study of an MMAL problem in Rane(Madras) Ltd.(India), in which a problem based genetic algorithm(GA) has been proposed to minimize the mentioned objectives. The working of the genetic operators such as selection, crossover and mutation has been modified with respect to the addressed MMAL problem. The results show that there is a significant impact over productivity and the process time of the final assembled product, i.e., the rate of production is increased by 39.5% and the assembly time for one particular model is reduced to 13 min from existing 18 min. Also, the space required using the proposed assembly line is only 200 m2 against existing 350 m2. Further, the algorithm helps in reducing workers fatigue(i.e., ergonomic friendly). 展开更多
关键词 OPTIMIZATION line balancing genetic algorithm product family assembly line
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