Effects of N2/CO2 on explosion characteristics of methane and air mixture

Wang, Z.R.; Ni, Lei; Liu, X.; Jiang, Juncheng; Wang, R.

doi:10.1016/j.jlp.2014.06.004

Cited by 98 publications

(27 citation statements)

References 7 publications

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“…Hu modified Mg(OH) 2 powders by the use of 9,10-dihydro-9-oxygen mixed-10-phosphaphenanthrene-10-oxide, and the results showed that the pyrolysis fragments could directly react with flame free radicals to achieve an excellent explosion suppression effect [13]. His research also indicated that the development of modified inorganic mineral powders which can react with active free radicals (·H, ·HO 2 , ·CH, ·CH 3 and ·HCO) [14][15][16][17][18] of the methane explosion is an effective methane explosion suppression method.…”

Section: Introductionmentioning

confidence: 99%

“…However, it can lead to extremely serious consequences because of its explosiveness. Thus, in order to prevent or reduce the damage caused by methane explosions, many inhibitors have been developed such as inert gases, water mist, aerosol, powder inhibitors, and so on [2][3][4][5][6]. Chemical powders-especially inorganic powders-have attracted many studies owing to the advantages of their easy storage, low cost, high dispersion, and being environmentally benign.…”

Section: Introductionmentioning

confidence: 99%

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Suppression Effects of Hydroxy Acid Modified Montmorillonite Powders on Methane Explosions

et al. 2019

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In this paper, montmorillonite inhibitors modified with polyhydroxy functional groups by gluconic acid (GA) were successfully prepared. The particle size distribution, composition, surface functional groups, and pyrolysis characteristics of the pure montmorillonite powders (Mt) and the gluconic acid modified powders (G-Mt) were analyzed by using a laser particle analyzer, X-ray diffraction (XRD), Fourier transform infrared (FTIR) and thermogravimetry-differential scanning calorimetry (TG-DSC), respectively. The suppression effect of Mt and G-Mt on the 9.5% methane-air premixed gas was tested in a 20 L spherical explosion device and a 5 L pipeline experimental system. The results show that G-Mt displays a much better suppression property than that of Mt. The optimal explosion suppression effect concentration of Mt or G-Mt powders is about 0.25 g·L −1 . In this concentration, for G-Mt, the maximum explosion pressure declined by 26.7%, the maximum rate of pressure rise declined by 74.63%, and the time for the flame front to reach the top of the pipe was delayed by 242.5%. On the basis of the experimental data, the better suppression effect of G-Mt than Mt might be attributed to the presence of more hydroxyl groups on the surface.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Suppression Effects of Hydroxy Acid Modified Montmorillonite Powders on Methane Explosions

et al. 2019

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“…In recent years, researchers have made some progress in the technologies and materials for suppressing gas explosion. Chemical powders, aerosol, water mist and inert gases [1][2][3][4][5][6] were used for preventing the gas explosion. Due to the outstanding suppression effect, chemical powders have become a new research focus in the field of gas explosion suppression.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pristine Palygorskite Powders on Explosion Characteristics of Methane-Air Premixed Gas

et al. 2018

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In this study, pristine palygorskite powders were used as the inhibition materials to suppress the explosion of methane-air premixed gas for the first time. The composition, porosity and pyrolysis characteristics of the powders were tested by X-ray diffraction (XRD), energy dispersive spectrometry (EDS), N 2 adsorption-desorption and Thermogravimetry-differential scanning calorimetry (TG-DSC) techniques. The effects of pristine palygorskite powders concentration on the explosion pressure and the average velocity of flame propagation of the 9.5% methane-air premixed gas were tested by a 20 L spherical explosion system and a 5 L pipeline explosion system. The results indicated the pristine palygorskite powders possess a considerable suppression property on methane explosion. When the mass concentration of pristine palygorskite powders was 0.20 g·L −1 , the max-pressure of methane explosion was decreased by 23.9%. The methane explosion flame propagation velocity was inhibited obviously. Owing to the excellent inhibitory performance and the advantage of low-cost and environmental harmlessness, pristine palygorskite powders are potential new materials for the application on gas explosion suppression.Palygorskite clay is a kind of magnesian-aluminum silicate mineral with chain-layer structure [18][19][20]. China is the largest palygorskite clay origin country in the world. The typical Molecular formula of palygorskite is Mg 5 Si 8 O 20 (OH) 2 (H 2 O)·4H 2 O [21], which contains different metal ions related to different origins place, such as Al 3+ , Fe 3+ , Fe 2+ , etc. In recent years, palygorskite clay has been widely used in industrial fields such as petrochemical industry, environmental protection, food industry, ceramics, insulation materials and plastics [22,23]. In view of its structure, composition and high surface area, palygorskite clay may be feasible for application in the field of gas explosion suppression. However, to the best of our knowledge, there is still no research about the application of palygorskite clay in gas explosion suppression.Herein, pristine palygorskite powders were used as methane explosion suppression material for the first time. Pristine palygorskite powders were characterized by the techniques of XRD, EDS, N 2 adsorption-desorption and TG-DSC. The suppression properties of the pristine palygorskite powders for 9.5% methane-air premixed gas were tested in a 20 L spherical explosion vessel and a 5 L pipeline experimental system. Based on the sample characterization results and explosion parameters, the suppression mechanism of the pristine palygorskite powders on the gas explosion was further explored. Materials and Methods MaterialsPristine palygorskite powders, which are gray in color, were obtained from Xuyi, Jiangsu province, China. The samples were dried in a vacuum oven at 50 • C for 2 h, and further ground by an agate mortar. Finally, the pristine palygorskite powders for test were collected through a 200 mesh sieve screen. CharacterizationX-ray diffraction (XRD) analysis was ca...

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“…Among them, adding inhibitors into the combustible mixtures is an effective way to suppress explosions. These inhibitors can be water mists and sprays , solid particles , and inert gases . The suppression mechanisms are thermal cooling, shock‐flame breaking, or specific heat changing by these nonreactive medium.…”

Section: Introductionmentioning

confidence: 99%

The influence of N₂/CO₂ blends on the explosion characteristics of stoichiometric methane–air mixture

Chen

Yao

Deng

2018

Process Safety Progress

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In this study, the explosion parameters of stoichiometric methane-air diluted with nitrogen (N 2 )/carbon dioxide (CO 2 ) blends, that is, maximum explosion pressure (P max ), laminar burning velocity (S L ), and activation temperature (T a ), were investigated in a closed cylinder vessel. The concentrations of the dilution blends were 10% and 20%. The explosion pressure history was recorded by a pressure transducer. The results indicated that the dilution effect of CO 2 is more sensitive than that of N 2 . For a given dilution concentration, both the maximum explosion pressure and the laminar burning velocity decrease with the increase of CO 2 . In addition, the activation temperature is higher for increased CO 2 blends, demonstrating again that the diluent influence of CO 2 is more prominent.

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Effects of N2/CO2 on explosion characteristics of methane and air mixture

Cited by 98 publications

References 7 publications

Suppression Effects of Hydroxy Acid Modified Montmorillonite Powders on Methane Explosions

Suppression Effects of Hydroxy Acid Modified Montmorillonite Powders on Methane Explosions

Effect of Pristine Palygorskite Powders on Explosion Characteristics of Methane-Air Premixed Gas

The influence of N₂/CO₂ blends on the explosion characteristics of stoichiometric methane–air mixture

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Effects of N2/CO2 on explosion characteristics of methane and air mixture

Cited by 98 publications

References 7 publications

Suppression Effects of Hydroxy Acid Modified Montmorillonite Powders on Methane Explosions

Suppression Effects of Hydroxy Acid Modified Montmorillonite Powders on Methane Explosions

Effect of Pristine Palygorskite Powders on Explosion Characteristics of Methane-Air Premixed Gas

The influence of N2/CO2 blends on the explosion characteristics of stoichiometric methane–air mixture

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The influence of N₂/CO₂ blends on the explosion characteristics of stoichiometric methane–air mixture