Determination of the Self-Ignition Behavior of the Accumulation of Sludge Dust and Sludge Pellets from the Sewage Sludge Thermal Drying Station

Dowbysz, Adriana; Kukfisz, Bożena; Samsonowicz, M.; Bihałowicz, Jan Stefan

doi:10.3390/en16010046

Cited by 3 publications

(2 citation statements)

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“…Spontaneous ignition of materials may cause fires and explosions, and may occur during processing, transport, or storage of materials. Exothermic reactions occurring without external heat and/or other sources of ignition may pose a significant threat, thus, the knowledge of the material self-heating behavior is crucial to determine safe storage and transport conditions [35].…”

Section: Spontaneous Ignition Behaviormentioning

confidence: 99%

Comparative Analysis of Fire and Explosion Properties of Lycopodium Powder

Kukfisz,

Dowbysz,

Samsonowicz

et al. 2023

Energies

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Lycopodium (L.) clavatum powder, due to its uniform particle size distribution and low equilibrium moisture content, is often used as a reference material and a calibration benchmark for dust combustion and dust explosion studies. The aim of the study was to determine its fire and explosion parameters, compare them to values obtained in the previous literature findings, and assess the appropriateness of using lycopodium powder as a reference material. The research included the determination of minimum ignition temperatures of dust layer and dust clouds, spontaneous ignition behavior, and explosion characteristics of dust clouds including maximum explosion pressure, maximum rate of explosion pressure rise, and the lower explosion limit of the air/dust mixture. The results reveal that the maximum equipment temperature used with lycopodium dust should not exceed 215 °C for dust thickness up to 5 mm. In order to eliminate the risk of lycopodium dust ignition, the temperature of the equipment surfaces that can come into contact with the dust cloud should not exceed 300 °C. In order to prevent explosions, the concentration of lycopodium dust in air should not be greater than 15 g/m3. Based on the obtained results, it can be seen that lycopodium fire and explosion parameters vary slightly, and its usage as a benchmark is considered legitimate.

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Section: Spontaneous Ignition Behaviormentioning

confidence: 99%

Comparative Analysis of Fire and Explosion Properties of Lycopodium Powder

Kukfisz,

Dowbysz,

Samsonowicz

et al. 2023

Energies

Self Cite

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“…The temperature of the sludge pellets was 186 °C, whereas the temperature of the sludge dust was 26 °C lower. The obtained self ignition temperature values decrease with decreasing material content and are lowest for the largest basket volume (160 °C and 142 °C for sludge pellets and sludge dust, respectively) [10]. The self-ignition of dusts and solid bulk materials is important in process safety, and several variables on the self ignition temperature have not been thoroughly researched.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the self-ignition behavior of dangerous dust accumulations

Nălboc,

Prodan,

Szollosi Moța

et al. 2024

MATEC Web Conf.

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A process known as spontaneous combustion is brought on by the gradual oxidation of flammable organic particles and takes place when air passes over a mass of dust. Combustible powders react with air oxygen in a process known as oxidation, which produces carbon dioxide, carbon oxide, water, and other gases whose contents depend on the temperature at which the oxidation occurs. Combustible dusts can self-ignite depending on their chemical makeup, the characteristics of their constituent components, the particle size and mass geometry, and last but not least, the ambient temperature. Self-ignition is a complicated process that occurs in three subsequent or concurrent stages of development, namely self-heating, humidity evaporation, and self-ignition. Self-ignition is a complicated process that occurs in three separate or concurrent stages of development, namely self-heating, humidity evaporation and self-ignition, all of which interact with one another. Even at normal temperatures, the molecules on the surface of combustible dust particles are prone to exothermic interactions with oxygen in the air conveyed in the free volume between particles, which is the cause of self-heating (or possibly self-ignition). The temperature of the reactive-air dust system will then rise as a result of any heat emitted, hastening the reactivity of other dust molecules with oxygen. By using drying tests at constant temperatures, this work aims to demonstrate the self-ignition behavior of flammable dusts by volume.

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