Flame propagation characteristics of mixed pulverized coal at the atmosphere of gasification
TL;DR: In this article, a vertical pipeline was built with a high-speed camera, micro-thermocouple and pressure sensor to obtain the characteristics of flame propagation in coal gasification.
About: This article is published in Fuel.The article was published on 2021-09-15. It has received 16 citations till now. The article focuses on the topics: Coal & Pulverized coal-fired boiler.
Citations
More filters
TL;DR: In this paper , the authors investigated the effects of NaHCO3 on coal dust explosion by employing a simultaneous thermal analyzer and a standard 20-L spherical chamber, and the results demonstrated that the thermal decomposition temperature of coal dust was increased and the thermal deformation rate, maximum heat flow, and heat release were decreased after the addition of NaHCO3.
33 citations
TL;DR: In this paper, a composite inhibitor with the combination of zeolite and carbamide was presented and analyzed in a 20 L explosion spherical vessel, which was compared with that of carbamide and zerosolite.
23 citations
TL;DR: In this article , a composite inhibitor with the combination of zeolite and carbamide was presented and analyzed in a 20 L explosion spherical vessel, which was compared with that of carbamide and zerosolite.
23 citations
TL;DR: In this paper, the authors investigated the suppression of local whole-inerting on the flame propagation of methane/coal dust deflagration by using N2 as loading gas to dispersed fly ash into a fixed zone of the pipe.
16 citations
TL;DR: In this paper, a 20 L spherical explosive device was adopted to compare with SiO2 and NH4H2PO4 at the atmosphere of coal gasification, and the thermal decomposition behavior and chemical structures of the explosion residues were characterized by synchronous thermal analyzer, X-ray photoelectron spectroscopy and FTIR.
14 citations
References
More filters
TL;DR: CAC-5 (modified AC) exhibits better CO2 adsorption performance, which can be attributed to the formation of the CO2-philic active sites on AC surface by N-species, and the high IAST selectivity factor for N-doped ACs indicates their excellent Adsorption selectivity for CO2 over N2.
145 citations
TL;DR: In this article, it was shown that an absolute minimum ignition energy should exist for some dust clouds with a similar meaning than for premixed gaseous flames, and that the standard ignition temperature (Godbert-Greenwald) seems to be reasonably correlated to the size and critical ignition temperature of the heating body.
Abstract: The history of the development of the process industry has been punctuated by a number of hazardous explosions, sometimes very severe. A few of them are still in the memory and certainly contributed to the birth of safety engineering. It has been known for more than one century than combustible dusts suspended in air are responsible for a part of those explosions but contrariwise to gas explosions, the available knowledge and practise seems still contain a significant part of empirism. The work summarised into this paper is an attempt to contribute to a better understanding of the explosion mechanisms of dust clouds. Hopefully, such additional information may help to refine the safety analysis exercise in the future. A specific effort has been devoted to combustion processes in the flame and the results indicate similarities with premixed gaseous flames. Several fundamental questions are addressed such as the incidence of thermal radiation, turbulence,… This information is important to treat ignition aspects. For spark type of ignition, it is shown that an absolute minimum ignition energy should exist for some dust clouds with a similar meaning than for premixed gaseous flames. For hot surface ignition, the standard ignition temperature (Godbert–Greenwald) seems to be reasonably correlated to the size and critical ignition temperature of the heating body. The possible implications of this new information within the scope of industrial safety are addressed in conclusion.
133 citations
TL;DR: In this paper, the explosion characteristics of H2/CH4/air and CH4/coal dust/air mixtures as well as the solid explosion products were investigated using a standard 20L explosion spherical vessel.
120 citations
TL;DR: In this paper, coal dust and the suppressing agent were injected into the experimental tube by the dust dispersion units, and a self-sustained detonation wave characterized by the existence of a transverse wave was propagated in the coal dust/air mixtures.
Abstract: Methane/coal dust/air explosions under strong ignition conditions have been studied in a 199 mm inner diameter and 30.8 m long horizontal tube. A fuel gas/air manifold assembly was used to introduce methane and air into the experimental tube, and an array of 44 equally spaced dust dispersion units was used to disperse coal dust particles into the tube. The methane/coal dust/air mixture was ignited by a 7 m long epoxypropane mist cloud explosion. A deflagration-to-detonation transition (DDT) was observed, and a self-sustained detonation wave characterized by the existence of a transverse wave was propagated in the methane/coal dust/air mixtures. The suppressing effects on methane/coal dust/air mixture explosions of three solid particle suppressing agents have been studied. Coal dust and the suppressing agent were injected into the experimental tube by the dust dispersion units. The length of the suppression was 14 m. The suppression agents examined in this study comprised ABC powder, SiO2 powder, and rock dust powder (CaCO3). Methane/coal dust/air explosions can be efficiently suppressed by the suppression agents characterized by the rapid decrease in overpressure and propagating velocity of the explosion waves.
107 citations
TL;DR: In this paper, the effect of CO 2 on flame propagation velocity of pulverized coal clouds were studied experimentally using micro-gravity condition, and also numerically considering detailed radiation heat exchange using Monte Carlo method.
106 citations