Analysis of Coal Dust Ignition Deposited in a Layer at Constant and Variable Temperature of Heating Panel

Kukfisz, Bożena; Siuta, Dorota; Szaferski, Waldemar

doi:10.1007/978-3-030-39867-5_22

Cited by 2 publications

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“…The ignited layer of dust may then play the role of an ignition source for subsequent explosions. Very often, designers of technological processes do not have sufficient knowledge concerning the basic physical and chemical parameters of materials [6] and their dusts occurring under specific process conditions. Data related to cut tobacco in high temperatures above 100 • C are scarce and not sufficiently available in the literature [7].…”

Section: Introductionmentioning

confidence: 99%

“…Explosion and fire properties of tobacco after drying with superheated steam, such as maximum explosion pressure, P max ; maximum rate of pressure rise, (dP/dt) max ; explosion index, K St ; minimum explosion concentration, MEC; minimum ignition energy, MIE; minimum ignition temperature, MIT; and limiting oxygen concentration, LOC [6,7], were experimentally determined according to standards shown in Table 2.…”

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confidence: 99%

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Integration of Safety Aspects in Modeling of Superheated Steam Flash Drying of Tobacco

et al. 2021

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Knowledge of the drying properties of tobacco in high temperatures above 100 °C and its dust are crucial in the design of dryers, both in the optimization of the superheated-steam-drying process and in the correct selection of innovative explosion protection and mitigation systems. In this study, tobacco properties were determined and incorporated into the proposed model of an expanding superheated steam flash dryer. The results obtained from the proposed model were validated by using experimental data yielded during test runs of an industrial scale of a closed-loop expansion dryer on lamina cut tobacco. Moreover, the explosion and fire properties of tobacco dust before and after the superheated steam-drying process at 160, 170, 180, and 190 °C were experimentally investigated, using a 20 L spherical explosion chamber, a hot plate apparatus, a Hartmann tube apparatus, and a Godbert–Greenwald furnace apparatus. The results indicate that the higher the drying temperature, the more likely the ignition of the dust tobacco cloud, the faster the explosion flame propagation, and the greater the explosion severity. Tobacco dust is of weak explosion class. Dust obtained by drying with superheated steam at 190 °C is characterized by the highest value of explosion index amounting to 109 ± 14 m·bar·s−1, the highest explosion pressure rate (405 ± 32 bar/s), and the maximum explosion pressure (6.7 ± 0.3 bar). The prevention of tobacco-dust accumulation and its removal from the outer surfaces of machinery and equipment used in the superheated steam-drying process are highly desirable.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%