Under-expansion jet flame propagation characteristics of premixed H2/air in explosion venting

Cao, Weiguo; Zhao, Zhou; Li, Wenjuan; Zhao, Yu Hong; Yang, Zhenxin; Zhang, Yun; Ouyang, Shin-Mei; Shu, Chi‐Min; Tan, Yingxin

doi:10.1016/j.ijhydene.2021.09.109

Cited by 91 publications

(18 citation statements)

References 51 publications

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“…In the process of coal dust explosion, there are both gas-phase reactions and particle-phase reactions. After the coal dust particles are ignited, a large amount of combustible volatile gas is released, the combustible gas and combustible particles explode together, and a large amount of energy is released [14][15][16][17][18]. Relevant research results show that, under the same conditions, the intensity of the particle-phase explosion reaction is much greater than that of the gas-phase explosion [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

et al. 2023

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Coal dust explosion is a major accident affecting the safety of coal mine production. In order to control coal dust explosion, using inert dust to suppress explosion is one of the effective methods. Taking the gas-fat coal as the research object and CaCO3, NaCl, and NH4H2PO4 as the inert dust, the suppression effect of inert dust on gas-fat coal dust explosion pressure and flame is studied. It is found that when the gas-fat coal dust particle size is 48~58 ?m, both the maximum pressure and the farthest distance of flame reach the maximum value. Among the three inert dusts, NH4H2PO4 has the best suppression effect, followed by NaCl, and CaCO3 has the worst suppression effect on explosion. The smaller the particle size of NH4H2PO4, the better the explosion suppression effect. When the mass percentage of NH4H2PO4 mixed into gas-fat coal dust is 60%, and the particle size of NH4H2PO4 is 0~38 ?m, the explosion is completely suppressed, it is mainly due to the isolation of the coal dust particles from the oxygen and the dilution of the oxygen concentration.

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Section: Introductionmentioning

confidence: 99%

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

et al. 2023

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“…When the liquid propellant explodes accidentally, there are mainly two harmful effects caused by explosion shock wave and thermal damage. The shock wave effect is one of the most important indicators for weighing the destructive force of the explosion on the target [16][17][18][19][20][21]. In the engineering practice, the safety technical measures, such as proper safety distance setting and isolated anti-explosion protection, are relatively vital techniques to ensure the safety of personnel and facilities during the production, storage and test of liquid propellants.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Damage Effects in the Deflagration Process of Typical Liquid Propellants

Sang

et al. 2022

Propellants Explo Pyrotec

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To study the damage effects caused by accidental deflagration of liquid propellants during production, storage, transportation and use, the information of the deflagration processes and the shock wave hazards of three typical liquid propellants under external flame stimulation were obtained by a high-speed camera and a shock wave pressure acquisition system. Additionally, in the same situation, the highest temperature of the surface fireball and the law of fireball of the thermal radiation were also studied by an infrared thermal imager and heat flux test system. High-speed video results showed that the fireball of DT-3 developed most violently of the three liquid propellants; anhydrous hydrazine took the second place and metallized gelled MMH was the weakest. The average TNT equivalents of 18 kg anhydrous hydrazine, 18 kg DT-3, 120 kg anhy-drous hydrazine and 120 kg DT-3 were 0.724, 0.629, 0.000375 and 0.0293 respectively. The peak values of thermal radiation flux were in the order of DT-3 > anhydrous hydrazine > metallized gelled methylhydrazine. The corresponding death radius in the accident was supposed to be 20-30 m. Experimental results indicated that package design pressure of liquid propellant had a significant effect on the intensity of the reaction response to the action of flame stimulation. Within a certain range, the package design pressure of liquid propellant should be appropriately reduced to improve its security in storage and use. The study provided a theoretical guidance for the explosion protection of liquid propellant in case of accidental deflagration.

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“…In essence, dust explosion is a kind of combustion reaction, but the power of explosion is far greater than that of combustion. Previous studies found that the mechanism of gas explosion is different from that of dust explosion [8][9][10][11][12][13][14][15]. Gas explosion is a gas-phase combustion reaction, while dust explosion is a two-phase turbulent combustion reaction of gas and solid, so dust explosion is far more destructive than gas explosion [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Research on suppression effect of different types of inert dust on coking coal dust explosion pressure in a confined space

Liu

2022

Preprint

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To study the suppression effect of inert dust on coking coal dust explosion pressure, NaCl, KCl and NH4H2PO4 are selected for explosion suppression. It is found that as dust cloud mass concentration increases in the range of 300~500 g/m3, both Pmax and (dP/dt)max increase first and then decrease. The coal dust explosion pressure decreases continuously as the mass percentages of inert dust mixed into coal dust increase from 0% to 70%. The explosion no longer occurs when the mass percentage of NH4H2PO4 mixed into coal dust is 70%, indicating that NH4H2PO4 is more effective than that of NaCl and KCl. The smaller the particle size of inert dust NH4H2PO4, the more obvious the suppression effect on dust explosion. The coal dust no longer explodes when the mass percentage of NH4H2PO4 mixed into coal dust is 60% and the particle size of NH4H2PO4 is 25~38 μm, which proves that decreasing the particle size of NH4H2PO4 is important for suppressing explosion.

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Under-expansion jet flame propagation characteristics of premixed H2/air in explosion venting

Cited by 91 publications

References 51 publications

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

Comparative Study on the Damage Effects in the Deflagration Process of Typical Liquid Propellants

Research on suppression effect of different types of inert dust on coking coal dust explosion pressure in a confined space

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