Dynamic resilience assessment and emergency strategy optimization of natural gas compartments in utility tunnels

Bai, Yiping; Wu, Jiansong; Yuan, Shuaiqi; Reniers, Genserik; Yang, Ming; Cai, Jitao

doi:10.1016/j.psep.2022.07.008

Cited by 31 publications

(4 citation statements)

References 56 publications

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“…Many subsequent studies using performance curves to assess resilience have evolved from this 33‐35 . For the performance of a structure or system, previous research has focused on representations such as the failure rate, 8,36 leakage rate, 37 power supply, 4 and service quantity, 38 among others. Since the primary function of the mooring system is to maintain the stability of the floater, the failure rate of mooring systems can reflect its performance level.…”

Section: Mooring System Resilience Assessment Methodsmentioning

confidence: 99%

Reliability‐based resilience assessment method for mooring systems under mooring failure

Yu,

Zhang,

Zhang

et al. 2024

Earthquake Engineering and Resilience

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Offshore floating structures rely heavily on their mooring systems, which can be disrupted by various events during long‐term operation. These could lead to a mooring failure, affecting the usual operations of the structure or even causing more severe hazards. Resilience provides a comprehensive evaluation of how the mooring system performs after a disaster, which is key to optimizing the structural design and operational safety. In this paper, we develop a general and user‐friendly method to quantitatively assess the resilience of mooring systems under mooring failure. We use the reliability index to represent the performance of the mooring system. We then derive its RV, ACI, and RCI, which are based on a system performance curve and reliability analysis. We also consider the effects of climate change and the corrosion of the mooring chain. These factors can significantly affect environmental loads, structural performance, and the recovery process. Moreover, an illustrative example is provided that guides us through the methodology. The proposed method is applied to assess the resilience of a certain mooring system in the South China Sea over a 30‐year service life under different failure scenarios. Our results indicate that overlooking climate change in the design and operation of the mooring system can lead to a significant overestimation of its reliability index and resilience value.

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Section: Mooring System Resilience Assessment Methodsmentioning

confidence: 99%

Reliability‐based resilience assessment method for mooring systems under mooring failure

Yu,

Zhang,

Zhang

et al. 2024

Earthquake Engineering and Resilience

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“…Bu used numerical simulation to analyze the different factors affecting methane leakage in utility tunnels and established a prediction equation for the methane intrusion distance under natural ventilation conditions, which provides a reference for the installation distance of methane leakage alarm devices [17]. Bai optimized the layout of sensors in the utility tunnels based on their ability to recover from human casualties and economic losses [18]. Zhao created an experimental setup to model natural gas explosions in utility tunnels, studied the effects of gas chamber length and pressure relief conditions on flame behavior, and examined several parameters related to natural gas explosion severity [19].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hydrogen-Blended Natural Gas Pipelines in Utility Tunnel Leakage and Development of an Accident Ventilation Strategy for the Worst Leakage Conditions

Xu,

Guan,

Wei

et al. 2024

Applied Sciences

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The development of hydrogen-blended natural gas (HBNG) increases the risk of gas transportation and presents challenges for pipeline security in utility tunnels. The objective of this study is to investigate the diffusion properties of HBNG in utility tunnels and evaluate the effectiveness of various ventilation mechanisms. The numerical simulation software Fluent 2023 R1 is applied to simulate and analyze the leakage of small holes in a HBNG pipeline in the natural gas compartment. By examining the leaking behavior of HBNG through small holes in different circumstances, we aimed to identify the most unfavorable operational situation for leakage. Subsequently, we analyzed the ventilation strategy for sub-high-pressure pipes at various pressure levels in this unfavorable condition. This study’s findings demonstrate that blending hydrogen improves the gas diffusion capacity and increases the likelihood of explosion. The primary factors that influence the pattern of leakage are the size of the leaking holes and the pressure of the pipeline. The gas compartment experiences the most unfavorable working conditions for natural gas pipeline leaks when there are higher pressures, wider leak openings, higher hydrogen blending ratios (HBRs), and leaks in close proximity to an air inlet. When the HBR is 20%, the minimum accident ventilation rates for pressures of 0.4 MPa and 0.8 MPa are 15 air changes per hour and 21 air changes per hour, respectively. The maximum allowable wind speed for accident ventilation is 5 m/s, as regulated by China’s national standard, GB 50838-2015. This regulation makes it difficult to minimize the risk of leakage in a 1.6 MPa gas pipeline. It is recommended to install a safety interlock device to quickly shut off the pipeline in the event of a leak in order to facilitate the dispersion of the substance.

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“…With the current pressure to adopt more sustainable manufacturing and a circular economy, there is a real incentive to minimize waste and achieve high manufacturing efficiency at all development and operation stages. Shutdown optimization studies are relatively scarce and most of the published work to date focused on safety , or emergency shutdown, but only few investigated the maximization of productivity and reduction of wastes. For example, Luperini-Enciso and coauthors proposed closed-loop optimal startup and shutdown strategies for a simulated moving bed chromatography using model predictive control with piece-wise constant profiles .…”

Section: Introductionmentioning

confidence: 99%

Single and Multiobjective Shutdown Optimization of a Multistage Continuous Crystallizer

Liu,

Benyahia

2024

Ind. Eng. Chem. Res.

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This study presents the first model-based optimal shutdown procedure of a multistage continuous crystallization process which aims at the maximization of on-spec production and minimization of the shutdown time. The cooling antisolvent crystallization of Aspirin (acetylsalicylic acid) in a three-stage continuous crystallizer was used as a case study. To address the optimal shutdown problem, several single optimization scenarios were considered to assess the impact of the degrees of freedom, discretization schemes, and optimization settings such as the constraints. The proposed optimal shutdown procedures showed that significant amounts of on-spec crystals can be produced both at fixed and variable shutdown times. Most importantly, the optimal shutdown procedures can match the steady-state productivity, based on the shutdown to steady-state productivity ratio (STSPR) which can easily reach 100%. Moreover, the residual shutdown material, considered as waste, can be dramatically reduced by >80% compared to the current standard shutdown procedures. Given the conflicting nature of the maximization of on-spec production and minimization of the shutdown time, multiobjective optimization of the shutdown operation was also addressed to identify the set of Pareto optimal solutions. Finally, a multicriteria decision-aiding method, based on multiattribute utility theory, was proposed to rank the Pareto optimal solutions to support the decision-making and help identify a suitable and feasible single optimal shutdown solution.

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Dynamic resilience assessment and emergency strategy optimization of natural gas compartments in utility tunnels

Cited by 31 publications

References 56 publications

Reliability‐based resilience assessment method for mooring systems under mooring failure

Reliability‐based resilience assessment method for mooring systems under mooring failure

Investigation of Hydrogen-Blended Natural Gas Pipelines in Utility Tunnel Leakage and Development of an Accident Ventilation Strategy for the Worst Leakage Conditions

Single and Multiobjective Shutdown Optimization of a Multistage Continuous Crystallizer

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