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城市燃气管网风险评估方法研究
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摘要
近年来,随着城市经济和建设发展水平的不断提高,城市燃气工业快速发展,燃气管网的使用日趋普及。与此同时,城市燃气管网安全性能的问题也逐渐得到人们的关注。本文以城市燃气管网的风险为研究对象,从定性和定量两个角度研究对燃气管网进行风险评估的方法。?
     定性风险评估的思路为根据燃气管网事故的历史数据和燃气管网周边设施、环境数据,建立城市燃气管网风险评估指标体系,通过指标体系评估城市燃气管网的风险。本文所建立的指标体系由管网脆弱性指标、事故诱因指标、事故后果指标以及各指标的权重共同组成,综合描述燃气管网事故发生的可能性和后果严重程度。其中,指标的选择来源于实际的城市燃气管网事故特点及历史数据分析;权重的计算主要是根据可靠性工程算法理论和灰色关联理论。
     定量风险评估的思路为根据不同燃气事故的物理模型和物理规律,分析并提出一种可用于城市燃气管网定量风险评估的一般性思路,这一新思路可分为事故可能性分析、后果分析和风险评估三个环节,包含了不同类型事故后果的物理模型与分析。其中,事故后果分析包括管网外部风险和管网内部风险两部分,管网外部风险评估主要研究燃气事故后果所造成的致死概率在空间内的分布,进而计算在个人风险和社会风险在空间内的分布;管网内部风险评估主要研究事故风险在管网内传播的机制及管网相继失效的模型。
     为验证两种风险评估方法的可行性和实用性,本文采用了两个实际的城市燃气管网进行风险评估。通过地理信息系统绘图对比两个实例的分析结果,可以发现两种风险评估方法的评估结果具有良好的相似性和实用性,均能够运用于实际的城市燃气管网风险评估。而在实际的应用过程中,方法的选择取决于评估对象的基础数据详尽程度以及风险评估所需的计算精度要求。
     本文提出的风险评估方法可以对城市燃气管网进行综合风险评估,为城市燃气管网安全管理提供数据支持,为建立预测预警系统和防灾减灾机制提供依据。
Recently natural gas industry is developing rapidly, and its accidents are threatening the urban safety. Risk management through quantitative assessment has become an important way to improve the safety performance of the natural gas supply system. This paper focuses on the risk of urban natural gas pipelines, and assesses risk by qualitative analysis and quantitative evaluation.
     In this paper, a qualitative as well as an integrated quantitative risk assessment methods for urban natural gas pipeline network are proposed. The qualitative method is an improvement to the Kent Grading method which is manly used for the long-distance pipeline, and has three primary indexes as inherent risk index, causation index and consequence index. The causation index displays the factors induce the natural gas pipelines accidents, the inherent risk index displays the vulnerability of natural gas pipelines, and the consequence index displays the consequence of natural gas pipelines accidents. The selection of indexes is according to the character of gas pipeline accidents, and the distribution of weights is based on the Reliability Engineering Theory and the Grey Correlation Theory.
     The integrated quantitative risk analysis method for natural gas pipeline network proposed is composed of the probability assessment of accidents, the analysis of consequences and the evaluation of risk. This new method consists of different accident effect analysis and physics model analysis, including release rate calculation, physics effects calculation, death probability calculation, risk calculation, etc. The models that are possibly needed in urban gas transmission pipelines risk are investigated.It is noteworthy that the consequences analyzed here include those of the outside and inside gas pipelines. The analysis of consequences of the outside pipelines focuses on the individual risk and societal risk caused by different accidents, while that of the inside pipelines concerns about the risk of the economic loss because of the pressure re-distribution.
     To demonstrate the presented methods, a small sample urban natural gas pipeline network including 95 pipelines and a large sample urban natural gas pipeline network including 5421 pipelines are used for risk assessment. The results show that both of two presented risk assessment methods for natural gas pipeline network can be used in practical application, and the choice of methods depends on the actual basic data of the gas pipelines and the requirement of assessment accuracy.
引文
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