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排序方式: 共有143条查询结果,搜索用时 140 毫秒
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In complex industrial system, most of single faults have multiple propagation paths, so any local slight deviation is able to propagate, spread, accumulate and increase through system fault causal chains. It will finally result in unplanned outages and even catastrophic accidents, which lead to huge economic losses, environmental contamination, or human injuries. In order to ensure system intrinsic safety and increase operational performance and reliability in a long period, this study proposes an integrated safety prognosis model (ISPM) considering the randomness, complexity and uncertainty of fault propagation.ISPM is developed based on dynamic Bayesian networks to model the propagation of faults in a complex system, integrating the priori knowledge of the interactions and dependencies among subsystems, components, and the environment of the system, as well as the relationships between fault causes and effects. So the current safety state and potential risk of system can be assessed by locating potential hazard origins and deducing corresponding possible consequences. Furthermore, ISPM is also developed to predict the future degradation trend in terms of future reliability or performance of system, and provide proper proactive maintenance plans. Ant colony algorithm is introduced in ISPM by comprehensively considering two factors as probability and severity of faults, to perform the quantitative risk estimation of the underlining system. The feasibility and benefits of ISPM are investigated with a field case study of gas turbine compressor system. According to the outputs given by ISPM in the application, proactive maintenance, safety-related actions and contingency plans are further discussed and then made to keep the system in a high reliability and safety level in the long term. 相似文献
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循环氢中断是甲苯歧化装置中十分严重的事故,通常设置有针对该工况的紧急泄压停车系统(ESD)。在保证装置在较短时间内完成泄压的同时,必须确保设备和催化剂的安全,因此确定一个适当的泄压速度尤为重要。紧急泄压是一种动态的过程,本文利用DYNSIM动态模拟软件,以180万吨/年甲苯歧化装置为研究对象,建立该装置氢气循环反应系统的动态模型,利用该模型研究了紧急泄压工况下泄压速度对装置操作参数的影响。通过调整动态模型中控制阀的开度,实现对不同泄压速度的模拟,考察了泄压速度与泄压时间和反应进出料换热器温降速率的关系,验证了反应器压差的变化趋势。模拟结果显示,泄压速度与泄压时间成反比关系、与反应进出料换热器的温降速率成正比关系,紧急泄压工况反应器压差会大幅度下降。在此基础上得出了较优的泄放流量,可用于泄压限流孔板的设计,保证反应系统的安全运行。 相似文献
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An integrated qualitative and quantitative modeling framework for computer‐assisted HAZOP studies 下载免费PDF全文
Jing Wu Laibin Zhang Jinqiu Hu Morten Lind Xinxin Zhang Sten Bay Jørgensen Gürkan Sin Niels Jensen 《American Institute of Chemical Engineers》2014,60(12):4150-4173
The article proposes a novel practical framework for computer‐assisted hazard and operability (HAZOP) that integrates qualitative reasoning about system function with quantitative dynamic simulation in order to facilitate detailed specific HAZOP analysis. The practical framework is demonstrated and validated on a case study concerning a three‐phase separation process. The multilevel flow modeling (MFM) methodology is used to represent the plant goals and functions. First, means‐end analysis is used to identify and formulate the intention of the process design in terms of components, functions, objectives, and goals on different abstraction levels. Based on this abstraction, qualitative functional models are constructed for the process. Next MFM‐specified causal rules are extended with systems specific features to enable proper reasoning. Finally, systematic HAZOP analysis is performed to identify safety critical operations, its causes and consequences. The outcome is a qualitative hazard analysis of selected process deviations from normal operations and their consequences as input to a traditional HAZOP table. The list of unacceptable high risk deviations identified by the qualitative HAZOP analysis is used as input for rigorous analysis and evaluation by the quantitative analysis part of the framework. To this end, dynamic first‐principles modeling is used to simulate the system behavior and thereby complement the results of the qualitative analysis part. The practical framework for computer‐assisted HAZOP studies introduced in this article allows the HAZOP team to devote more attention to high consequence hazards. © 2014 American Institute of Chemical Engineers AIChE J 60: 4150–4173, 2014 相似文献
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Dong Yuxiao Tong Dongshen Ren Laibin Chen Xingtao Zhang Hao Yu Weihua Zhou Chunhui 《Catalysis Letters》2021,151(10):2797-2806
Catalysis Letters - Kaolinite, a natural, layered phyllosilicate, has been used as the solid catalyst for the hydrolysis of cellulose in our previous work. In the present study, kaolinite was... 相似文献
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大功率柴油机技术的发展 总被引:1,自引:0,他引:1
本文主要介绍了各种不同用途低、中、高速大功率柴油机在结构、性能、排放等方面发展的现状,分析、比较了降低排放的技术措施,以及燃油系统和电子控制系统等的技术发展方向。 相似文献
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李来彬 《内燃机与动力装置》2006,(1):10-13
本文主要介绍了各种不同用途低、中、高速大功率柴油机在结构、性能、排放等方面发展的现状,分析、比较了降低排放的技术措施,以及燃油系统和电子控制系统等的技术发展方向. 相似文献
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