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针对对二甲苯(PX)装置异构化单元在操作和控制中存在的问题,通过机理分析,在该装置首次提出了用宏观反应热衡量反应深度,并实现了反应热的实时计算;在此基础上建立了整个异构化单元基于状态空间模型的多变量预估控制系统,并在该装置得到了成功地应用.通过对加热炉、反应器以及精馏塔进行协调控制,实现了产晶质量的卡边控制,极大地提高了装置控制平稳率和安全性.提高对二甲苯收率0.37%,整个装置的综合能耗降低6.318 kg(EO)/t,同时获得了显著的经济效益,综合经济效益估算可达1009万元/年. 相似文献
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《计算机与应用化学》2017,(10)
以催化裂化装置反应再生过程为对象,采用多变量预测控制、软测量技术,并结合催化裂化反应过程集总动力学模型的研究,实现催化裂化装置提升管反应器产品干气、液化气、汽油、轻柴产率以及生焦率的在线实时预测和反应深度的闭环优化控制。工业应用结果表明:在催化裂化装置先进控制基础上开展反再过程的建模与优化是进一步挖掘装置效益的有效途径。 相似文献
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针对常减压装置(CDU)需要加工多种不同性质原油的特性,设计了一套在常减压装置中实现先进控制和实时优化的系统。该系统利用在线分析仪和实时数据装置,通过流程模拟计算操作变量和被控变量的优化目标。优化目标包括常压炉和减压炉出口温度,以及常压塔和减压塔主要产品拔出量等。通过多变量模型预测控制器,系统实现了对装置的稳定控制,按生产条件逐步实现工艺点接近计算的优化目标。应用结果表明,该优化系统能达到维持工艺参数安全、稳定和高效的目标。 相似文献
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精对苯二甲酸(PTA)是我国最重要的化工原料,本文以某大型PTA装置的对二甲苯(PX)氧化反应尾气冷凝系统为对象,基于工艺机理,建立了该系统的模型,实现了流程模拟,获得了工艺操作条件下各流股的组分信息。并在PX氧化反应热计算的基础上,利用模型,对PX氧化反应尾气冷凝系统进行了用能评估与优化,工业装置应用实施后,调整了两级副产蒸汽,有效提高了氧化反应热的利用率,改善了PX氧化反应过程的运行性能。 相似文献
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针对SC-1型乙烯气液相裂解炉控制问题,提出了一种鲁棒性较强的先进控制策略,开发了由“DCS控制层”和“上位机控制层”构成的先进控制系统.该系统有效地解决了燃料热值波动对裂解炉裂解气出口温度的影响,减少了裂解气出口温度和裂解炉总加工量的波动,实现了“卡边”控制及生产过程的安全逻辑保护,优化控制器可一键投运和切除,解决了裂解炉控制问题的复杂性.该系统成功应用于兰州石化46万吨/年乙烯装置,大幅度提高了装置的平稳率,提升了双烯收率,降低了装置能耗. 相似文献
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郑冬梅 《计算机与应用化学》2013,(8):917-920
为提高常减压装置的生产运行水平,燕山石化公司采用DMC Plus多变量动态矩阵控制软件,对初馏塔、常压塔、常压炉、减压塔和减压炉实行先进过程控制系统建设。并针对原油性质波动大的问题,新建一套核磁共振在线分析仪,对原油、常顶油、常一线和常二线等4种物料的15项物性指标进行在线分析,把馏程分析数据引入常压塔先进控制器,实现了前馈加反馈的控制模式;常顶干点、常一冰点、闪点和终馏点、常二线凝点的分析数据,校正先进过程控制系统的软仪表。两系统投用后,装置主要变量波动标准方差平均降低35%以上,航煤组分收率提高了0.79%。核磁共振在线分析仪首次在生产装置上实现了对原油的快速评测,并为装置防腐提供了实时的数据参考。 相似文献
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This article describes the rationale for the multiphase creative problem solving process, and reports the findings from an empirical investigation conducted to facilitate the problem solving of managers. The ideational skills of the managers were assessed before and after training in a complete process of creative problem solving, along with their ideational attitudes, creative problem solving style (i.e., generator, conceptualizer, optimizer, or implementor), and evaluative skill (i.e., ability to recognize original ideas). The most important findings indicated that the training had a significant impact on the evaluative accuracy of the managers. They were significantly more accurate in their judgments about original ideas after training, both in their identification of original ideas and their recognition of unoriginal ideas. After training, the managers also gave more solutions and more original solutions to problems. Finally, several variables (e.g., the “preference for active divergence” attitude, and the conceptualizer process style) seemed to moderate the impact of training. Training was therefore effective, with specific effects that can be predicted from pre-training individual differences in attitudes and process style. 相似文献
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The deep connection between the Burrows–Wheeler transform (BWT) and the so-called rank and select data structures for symbol sequences is the basis of most successful approaches to compressed text indexing. Rank of a symbol at a given position equals the number of times the symbol appears in the corresponding prefix of the sequence. Select is the inverse, retrieving the positions of the symbol occurrences. It has been shown that improvements to rank/select algorithms, in combination with the BWT, turn into improved compressed text indexes. 相似文献
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为提高高等院校的管理水平和决策水平,充分利用校园网资 源,开发了高等院校行政财政分析与决策系统。解决了诸如数据的动态查询、自动生成报表 、网络环境下数据共享等技术问题,具有网上数据共享、图形界面友好和安全的保密措施等 特点。 相似文献
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Harshavardhana P. Jonckheere E. Silverman L. 《Automatic Control, IEEE Transactions on》1984,29(8):744-746
A new method of stochastic model reduction has recently been introduced by Desai et al. [1], [2]. The stability of the reduced order model has not previously, been considered. In this paper, we show that the stability of the reduced order model follows directly from the results of Pernebo and Silverman [3]. It is also shown that the reduced order model is minimal, in the controllability/observability sense. The relevance of this notion of minimality to stochastic minimality is made clear. 相似文献
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