Explosion venting hazards of temperature effects and pressure characteristics for premixed hydrogen-air mixtures in a spherical container

Cao, Weiguo; Li, Wenjuan; Yu, Shuo; Zhang, Yun; Shu, Chi‐Min; Liu, Yifei; Luo, Jingwen; Bu, Lingtao; Tan, Yi

doi:10.1016/j.fuel.2020.120034

Cited by 102 publications

(15 citation statements)

References 33 publications

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“…The explosion pressure ( P m ) and the explosion pressure rise rate ([ dP / dt ] m ) were two important characteristic parameters for evaluating the severity of dust explosions 23‐27 . The explosive inhibition performance of the composite powder was tested in a 20‐L spherical explosive device.…”

Section: Resultsmentioning

confidence: 99%

Inhibition of aluminum‐silicon alloy dust explosion and flame by KH₂PO₄/montmorillonite composite powder

Qin

Meng

et al. 2021

Fire and Materials

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Summary To obtain a good explosive suppressant, KH2PO4/montmorillonite composite powder was prepared by the solvent‐antisolvent method by using montmorillonite as the carrier and KH2PO4 as the supported particles. Flame propagation inhibition and explosion inhibition of aluminum‐silicon alloy dust by the KH2PO4/montmorillonite composite powder were investigated in a vertical quartz glass combustion tube and 20‐L spherical explosive tank, respectively. The results showed that the flame propagation of aluminum‐silicon alloy dust was basically suppressed as the inerting ratio of KH2PO4/montmorillonite composite powder was 1.2, and the explosion of aluminum‐silicon alloy dust was basically inhibited as the inerting ratio of KH2PO4/montmorillonite composite powder was 1.8. The flame and explosion inhibition mechanism of KH2PO4/montmorillonite composite powder on aluminum‐silicon alloy dust was further analyzed in this paper.

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Section: Resultsmentioning

confidence: 99%

Inhibition of aluminum‐silicon alloy dust explosion and flame by KH₂PO₄/montmorillonite composite powder

Qin

Meng

et al. 2021

Fire and Materials

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“…The combustion was initiated in the driver channel by the ignition system, which was mainly composed of DC power supply with the voltage of 20 V and the current of 10 A, and a nickel-chromium alloy wire with the length of 100 mm and the diameter of 0.6 mm. The high-speed system supplied by Nikon Corporation is adopted to capture the variations in the flame shape and position with time of the whole channel, which is often used to calculate the flame propagation velocity [34,35]. The frame rate was set to 10000 fps with a resolution of 1024 × 628 pixels in the present study.…”

Section: Methodsmentioning

confidence: 99%

Study on the Flame Acceleration and Transition from Deflagration to Detonation of N₂O/C₂H₄/CO₂

Jiang³

2022

Propellants Explo Pyrotec

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The application of nitrous oxide (N 2 O) as a candidate oxidant provides new opportunities for green propellants and propulsion systems. In this study, flame propagation, acceleration, and transition to detonation characteristics of stoichiometric N 2 O/C 2 H 4 diluted with CO 2 were investigated in 2 m cylindrical channels at 1 atm and 293 K. The flame propagation and acceleration were monitored by a high-speed video. Pressure transducers were located at different positions along the channel to collect data concerning DDT and detonation development. The in-fluence rules of various mass fractions of CO 2 on the above performance were evaluated. The results indicated that the process of flame propagation for N 2 O/C 2 H 4 was divided into three stages, ignition stage, DDT and detonation stage. Both the process of flame acceleration (FA) and peak overpressure for all the test mixtures decreased with an increase of CO 2 concentration in the initial stage, and detonation wave propagation was stabilized with the increase of CO 2 , then the corresponding propagation velocity was close to the CÀ J velocity.

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“…The proportion of renewable energy power generation (including hydropower) in total power generation is increased from 24.3% to 28.6%. [5][6][7][8] Affected by solar and wind power generation, thermal power units need to have stronger flexible peak shaving [9][10][11] capacity and cleaner emission characteristics.…”

Section: Introductionmentioning

confidence: 99%

Influence of the parallel oil‐secondary air and F‐layer secondary air distribution on the flow, combustion, and NOx generation characteristics of FW down‐fired boilers retrofitted with a stable combustion technology

Liu

et al. 2022

Asia-Pacific J Chem Eng

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To further reduce the NOx emissions of the down-fired boiler while improving its low-load stable combustion capacity, a new low NOx combustion organization mode that utilizes the high velocity parallel oil-secondary air to improve the pulverized coal combustion process was proposed based on a novel stable combustion technology. We carried out cold airflow experiments under different oil-secondary air and F-layer secondary air distributions (mass flow rate ratios of 1:9, 1:3, 2:3) based on a 300 MWe Foster Wheeler down-fired boiler to study its influence on the flow and mixing characteristics of the coal/airflow. Results show that the mixing between the oil-secondary air and the fuel-rich coal/airflow is gradually delayed with the increase of the secondary air distribution. When the secondary air distribution reaches more than 2:3, the oilsecondary air starts to become the dominant airflow that influences the whole flow field in the furnace. Based on the result of the cold airflow experiment, we carried out industrial measurements under different parallel oil-secondary air and F-layer secondary air distributions (4:6, 5:5, 6:4) on a 600 MWe FW down-fired boiler under the condition of using the high velocity oil-secondary air. The ignition distance of the fuel-rich coal/airflow, the flue gas temperature, the O 2 , CO, and NOx concentrations in the furnace were measured. At the secondary air distribution of 4:6, the ignition distance of the fuel-rich coal/ airflow was about 1.31 m. When the secondary air distribution was increased to 5:5 and 6:4, the ignition was put off, but the pulverized coal/airflow could still catch on fire in time. With the increase of the parallel oil-secondary air proportion, the flame center in the furnace did not move downward substantially. In three cases, the lowest O 2 concentrations in the inspection port area under the burner were all below 1% (peak CO concentration values were all above 28,000 ppm). The pulverized coal all burned in a strong reducing atmosphere. At secondary air distributions of 4:6, 5:5, and 6:4, NOx emissions of the boiler were, respectively, 825.83, 819.48, and 853.86 mg/Nm 3 (O 2 = 6%). The

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Explosion venting hazards of temperature effects and pressure characteristics for premixed hydrogen-air mixtures in a spherical container

Cited by 102 publications

References 33 publications

Inhibition of aluminum‐silicon alloy dust explosion and flame by KH₂PO₄/montmorillonite composite powder

Inhibition of aluminum‐silicon alloy dust explosion and flame by KH₂PO₄/montmorillonite composite powder

Study on the Flame Acceleration and Transition from Deflagration to Detonation of N₂O/C₂H₄/CO₂

Influence of the parallel oil‐secondary air and F‐layer secondary air distribution on the flow, combustion, and NOx generation characteristics of FW down‐fired boilers retrofitted with a stable combustion technology

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Explosion venting hazards of temperature effects and pressure characteristics for premixed hydrogen-air mixtures in a spherical container

Cited by 102 publications

References 33 publications

Inhibition of aluminum‐silicon alloy dust explosion and flame by KH2PO4/montmorillonite composite powder

Inhibition of aluminum‐silicon alloy dust explosion and flame by KH2PO4/montmorillonite composite powder

Study on the Flame Acceleration and Transition from Deflagration to Detonation of N2O/C2H4/CO2

Influence of the parallel oil‐secondary air and F‐layer secondary air distribution on the flow, combustion, and NOx generation characteristics of FW down‐fired boilers retrofitted with a stable combustion technology

Contact Info

Product

Resources

About

Inhibition of aluminum‐silicon alloy dust explosion and flame by KH₂PO₄/montmorillonite composite powder

Inhibition of aluminum‐silicon alloy dust explosion and flame by KH₂PO₄/montmorillonite composite powder

Study on the Flame Acceleration and Transition from Deflagration to Detonation of N₂O/C₂H₄/CO₂