Determination of the Reliability of the Gas Generator of the Storage System and Hydrogen Supply

Abramov, Yuriy; Kryvtsova, V.; Mikhailyuk, A.

doi:10.33042/2522-1809-2023-3-177-142-146

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…It should be noted that this approach to obtaining the reliability indicator is multi-stage, as a result of which errors occur at each of the stages during its implementation, the values of which are integrated. In [20], the amplitude-frequency and phase-frequency characteristics of the gas generator are used to obtain reliability indicators of the gas generator of the hydrogen storage and supply system. It is shown that, with a probability of 0.9973 and 0.9812, respectively, its amplitude-frequency and phase-frequency characteristics will not differ from the nominal values by more than 5.0 % at the time of starting the gas generator.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…The peculiarity of these methods is that they are based on the use of the transient function of the gas gene rator, which can be determined during its operation. It should be noted that all methods for determining reliability indicators given in [19][20][21][22] are not applicable to the entire hydrogen storage and supply system, but only to its gas generator. This approach requires an answer to questions about its correctness.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…If expressions ( 15), (20), and ( 23) are combined, then the P 1max value will correspond to the condition:…”

Section: Mathematical Notation Of the Functioning Of The Fire Safety ...mentioning

confidence: 99%

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Determining the functioning efficiency of a fire safety subsystem when operating the hydrogen storage and supply system

Abramov,

Basmanov,

Krivtsova

et al. 2024

EEJET

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The object of research is the fire safety subsystem of hydrogen storage and supply systems. The subject of the study is the efficiency index of the fire safety subsystem of hydrogen storage and supply systems for different modes of its operation. As such an efficiency indicator, the conditional probability that the fire safety subsystem correctly recognizes the actual state of the hydrogen storage and supply system is used. The fire safety subsystem functions under the control mode and under the test mode. Mathematical models of the operation of the fire safety subsystem were built for such modes, based on the use of graph theory. The weight matrices of these graphs include the completeness of control or testing and the intensity of transition of the fire safety subsystem from one state to another. Determination of the effectiveness of such a subsystem – reliability of functioning – is carried out using Kolmogorov’s equations. It is shown that during the testing of hydrogen storage and supply system, the probability of its being in a fire-safe state has a maximum. It is shown that with values of completeness of control (testing) that do not differ from 1.0, the effectiveness of the functioning of the fire safety subsystem is invariant with respect to the mode of its functioning. With values of completeness of control (testing), which are significantly different from 1.0, the functioning of the fire safety subsystem under the testing mode is more effective. The identified features of the functioning of the fire safety subsystem make it possible in practice to implement an optimal or adaptive algorithm for the functioning of such subsystems. For example, with the appropriate selection of testing parameters, the fire safety subsystem provides determination of the location of the hydrogen storage and supply system with maximum probability

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Determining the functioning efficiency of a fire safety subsystem when operating the hydrogen storage and supply system

Abramov,

Basmanov,

Krivtsova

et al. 2024

EEJET

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Determining the Recovery Time of the Fire-Safe Condition of Hydrogen Storage and Supply Systems

Abramov,

Kryvtsova,

Mykhailiuk

2024

MEC

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The fire prevention system can function in passive or active modes. In active mode, such a system implements a set of measures aimed at restoring the fire-safe state of the hydrogen storage and supply system after it is in a fire-hazardous state. The authors consider variants of its functioning for a highly reliable fire prevention system. The first option has the reliability of the fire inspection, which is equal to one, and the second option has the reliability of the fire inspection, which is different from one. Using graphs of the states of the hydrogen storage and supply system, we constructed systems of Kolmogorov equations and derived expressions for the probabilities of finding this system in the corresponding states. The article shows that the time to restore the fire-safe state of the hydrogen storage and supply system in the first variant should not exceed the probability of its being in a fire-hazardous state, reduced to the unit of the intensity of the transition of this system from a fire-safe state to a fire-hazardous state. In the second option, the time to restore the fire-safe state of the hydrogen storage and supply system increases following the law described by a hyperbola of the first order, the argument of which is the reliability of the fire safety inspection of such a system. We have obtained an expression for the reliability of the functioning of the fire prevention system focused on ensuring the fire safety of hydrogen storage and supply systems. We show that the reliability of the functioning of such a prevention system depends significantly on the reliability of the fire-engineering inspection of the hydrogen storage and supply system. We have also derived an expression for the time to restore the fire-safe state of the hydrogen storage and supply system that is determined a priori by the reliability of the fire prevention system functioning, the reliability of the fire inspection, and the intensity of the transition of the hydrogen storage and supply system from the fire-safe to the fire-hazardous state. Keywords: hydrogen storage and supply system, fire prevention, recovery time.

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Efficiency of Operation of the Fire Safety Subsystem of the Hydrogen Storage and Supply System

Abramov,

Kryvtsova,

Mykhailiuk

2024

MEC

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Hydrogen may become one of the most valuable energy carriers in the 21st century. A big step to this is the safe, compact, and cost-effective storage of hydrogen provided by hydrogen storage systems (HSS). One of the operating system elements of the hydrogen storage and supply system is its fire safety subsystem. The effectiveness of such a subsystem’s functioning depends on a conditional probability that this subsystem correctly recognises the actual state of the hydrogen storage and supply system. We carry out the formalisation of the operation of the fire safety subsystem of the hydrogen storage and supply system in the form of a graph of its states. The study considers three modes of operation of such a subsystem: control, testing, and self-control. We build a weight matrix of the fire safety subsystem states. Its elements include the intensity of transitions from one state to another, the recovery intensity, and the completeness of control and testing. The study shows that the roots of the system of Kolmogorov equations determine the efficiency of the functioning of the fire safety subsystem of the hydrogen storage and supply system. We represent this system of equations in matrix form, with the main matrix having a size of 8×7. Next, we obtain expressions for the roots of such a system of comparisons and construct an expression for the efficiency of the fire safety subsystem’s functioning of the hydrogen storage and supply system. This expression applies to all three modes of operation of such a fire safety subsystem. The considered typical modes of operation of the fire safety subsystem of the hydrogen storage and supply system are control mode, control mode with self-control, and control and testing mode. For each of these modes, we obtain expressions that describe their effectiveness. It is necessary to note that the magnitudes of recovery intensities, in contrast to transition intensities, can vary. We further provide an example of choosing the intensities of restoration of the subsystem during its control using the acceptance criterion for the probability of finding the subsystem in a state corresponding to the fire-hazardous state of the hydrogen storage and supply system. Keywords: fire safety, efficiency, hydrogen storage and supply system.

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Determination of the Reliability of the Gas Generator of the Storage System and Hydrogen Supply

Cited by 3 publications

References 8 publications

Determining the functioning efficiency of a fire safety subsystem when operating the hydrogen storage and supply system

Determining the functioning efficiency of a fire safety subsystem when operating the hydrogen storage and supply system

Determining the Recovery Time of the Fire-Safe Condition of Hydrogen Storage and Supply Systems

Efficiency of Operation of the Fire Safety Subsystem of the Hydrogen Storage and Supply System

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