Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO<sub>2</sub> and ultrafine water mist

Pei, Bei; Wei, Shipeng; Chen, Liwei; Pan, Rongkun; Yu, Minggao; Guo-xun, Jing

doi:10.1039/c9ra01148j

Cited by 6 publications

(3 citation statements)

References 31 publications

(34 reference statements)

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“…There are many situations, where import substitution is practically not envisaged for the FEC objects, because of the required systems of the FS maintaining are integrated into the technological chains of the production processes and they form the organic whole with the already purchased state-of-the-art processing technologies. In this case, it should be necessary to pay attention to the fact that as of today systems of control and maintaining the fire safety at the FEC enterprises include components of equipment of foreign production [16,17]. In accordance with information, which is presented in article [18], 80% of the market of the fire-fighting protection facilities in 2018 is occupied by the foreign manufacturing companies.…”

Section: Discussionmentioning

confidence: 99%

Substantiation of application of the strategic planning methods In order to improve efficiency of the automated systems of fire and explosion protection at the fuel and energy complex facilities In the special conditions

Samarin¹,

Grinyaev²,

Strogonov³

et al. 2021

J Appl Eng Science

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This paper presents substantiation of the obligatory application of the strategic planning methods in order to improve efficiency of the automated systems of fire and explosion protection (ASFEP) at the facilities of the fuel and energy complex (FEC) in the special conditions. To this end, the technological production process of the FEC facilities is divided into destructive and creative subprocesses. It is assumed that the events that cause the potentially dangerous situations, which are connected with fires and explosions, form the destructive subprocess. The activities, which are carried out within the framework of fire safety plans at the FEC facilities and which are controlled by the shift on duty, form the creative subprocess. Events of the first subprocess reduce efficiency of the ASFEP, while events of the second subprocess increase efficiency of this system. Authors of the article propose the continuous curve of recovery of the ASFEP efficiency in order to ensure modelling the type of influence of various rehabilitation measures. Two kinds of the exponential functions enveloping the moments of fire and rehabilitation are analysed for these subprocesses. The article describes the graph of actual rehabilitation of the ASFEP efficiency taking into account assumptions concerning nature of these functions. The total efficiency of the rehabilitation measures within the creative subprocess consists of the partial efficiencies of the measures, which are included to individual plans of various subsystems of the ASFEP (subsystems of the first and second levels). These partial shares of efficiency have been analysed from the point of view of their dependency on the period of performance of these measures, on their funding and management. It was established that management of the relevant measures, which is determined with the help of the strategic planning methods, is the most significant parameter in this model.

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Section: Discussionmentioning

confidence: 99%

Substantiation of application of the strategic planning methods In order to improve efficiency of the automated systems of fire and explosion protection at the fuel and energy complex facilities In the special conditions

Samarin¹,

Grinyaev²,

Strogonov³

et al. 2021

J Appl Eng Science

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“…With respect to pure RM or NaHCO 3 powders, it showed a significant composite inhibitory effect manifested in a 44.9% decrease in the maximum explosion pressure, a decrease in the maximum pressure increase rate by 96.3%, and a decrease in the peak delay time by 366.7%. Pei et al (2018Pei et al ( , 2019 presented experimental studies using N 2 and CO 2 and ultra-fine water mist to suppress flame propagation characteristics in the initial explosion phase of a mixture of air and methane with a concentration of 9.5% in a constant volume chamber. In research, he stated that when the CO 2 volume share is greater than 14%, the flame disappears.…”

Section: Introductionmentioning

confidence: 99%

Active protection of work area against explosion of dust–gas mixture

Szkudlarek

Janas

2021

Int J Coal Sci Technol

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Potentially explosive atmosphere can occur not only in the production systems of the food, energy, chemical and petrochemical industries but also in the production processes of the mining industry. Gases, vapours, mists and dusts arise can escape in an uncontrolled way during production, processing, transportation and storage of flammable substances. In combination with oxygen, they create explosive atmospheres that, if ignited, lead to an explosion causing catastrophic damage to people's lives and property. To protect against the results of hazardous dust–gas mixtures explosions in a confined work space, where employees can stay, various control and protection mechanisms are used in the form of an active explosion-proof system. The article presents the results of tests on an active system for limiting the effects of ignition of gas and/or dust based on a highly efficient explosion suppression system—equipped with an ignition detection system, high-pressure fire extinguisher and a power supply and trigger system. Smokeless powder was used as the explosive charge and sodium bicarbonate as the suppressive material. Tests of the effectiveness of the active explosion suppression system were carried out on two devices: a small-size dry dust collector and a zone extinguishing system adapted for direct explosion suppression in closed working spaces. In both cases, the explosion suppression process took place through the action of extinguishing powder blown out of the fire extinguisher after membrane perforation by compressed combustion products.

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“…The effective gas explosion suppressants currently known include inert gas, , water mist, , chemical dry powder, rock dust, porous material, , and aerosol . Moreover, a large number of studies show that the type, particle size, spray mode, and mass concentration of the explosion suppression medium can affect the suppression effect to a certain extent. ,− In order to further enhance the explosion suppression effect of the medium, Pei et al studied the synergistic inhibition effect of CO 2 and ultrafine water mist on methane explosion. The experimental results showed that the inhibiting effect on flame propagation speed and overpressure of the combined use was greater than that of either individual suppressant, and Wang et al also pointed out that the gas–solid two-phase synergistic suppression of gas explosion is better than a single explosion suppression method.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cavity Width and Powder Filling in a Cavity on Overpressure Evolution Laws and Flame Propagation Characteristics of Methane/Air Explosion

Zhou

2021

ACS Omega

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Passive explosion suppression remains an indispensable auxiliary method for gas explosion suppression due to its low cost. To explore a new type of explosion passive suppression technology, three rectangular cavities with different width–diameter ratios were designed and laid in a large-scale methane/air explosion experiment system, and its explosion suppression performance was evaluated by measuring the changes in the explosion flame and shock wave before and after passing through the cavity. The results show that the suppression effect of the cavity is affected by its width. The larger the width–diameter ratio, the faster the attenuation of the flame and shock wave. The cavity-combined aluminum hydroxide powder effectively improves the suppression effect. When the filling amount of the powder is 140 g, the flame is quenched. However, there is an optimal powder filling degree for the suppression of the shock wave in the limited space of the cavity. In the test range, the maximum decay rate of the overpressure and impulse are 49.4 and 39.4%, respectively. This study can provide theoretical guidelines for the suppression of gas explosion.

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Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO₂ and ultrafine water mist

Abstract: The synergistic effect of CO2 and ultra-fine water mist can greatly reduce the self-acceleration of the spherical flame in the initial stage of gas explosion.

Cited by 6 publications

References 31 publications

Substantiation of application of the strategic planning methods In order to improve efficiency of the automated systems of fire and explosion protection at the fuel and energy complex facilities In the special conditions

Substantiation of application of the strategic planning methods In order to improve efficiency of the automated systems of fire and explosion protection at the fuel and energy complex facilities In the special conditions

Active protection of work area against explosion of dust–gas mixture

Influence of Cavity Width and Powder Filling in a Cavity on Overpressure Evolution Laws and Flame Propagation Characteristics of Methane/Air Explosion

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Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO2 and ultrafine water mist

Abstract: The synergistic effect of CO2 and ultra-fine water mist can greatly reduce the self-acceleration of the spherical flame in the initial stage of gas explosion.

Cited by 6 publications

References 31 publications

Substantiation of application of the strategic planning methods In order to improve efficiency of the automated systems of fire and explosion protection at the fuel and energy complex facilities In the special conditions

Substantiation of application of the strategic planning methods In order to improve efficiency of the automated systems of fire and explosion protection at the fuel and energy complex facilities In the special conditions

Active protection of work area against explosion of dust–gas mixture

Influence of Cavity Width and Powder Filling in a Cavity on Overpressure Evolution Laws and Flame Propagation Characteristics of Methane/Air Explosion

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Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO₂ and ultrafine water mist