Self-ignition risk classification for coal dust layers of three coal types on a hot surface
| Autor: | Bei Li, Bing Han, Gang Liu, Zhen-Bao Li, Chi-Min Shu, Mingshu Bi |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
020209 energy Coal combustion products 02 engineering and technology Coal dust Industrial and Manufacturing Engineering law.invention 020401 chemical engineering law 0202 electrical engineering electronic engineering information engineering Coal 0204 chemical engineering Electrical and Electronic Engineering Spontaneous combustion Civil and Structural Engineering business.industry Mechanical Engineering Metallurgy Building and Construction Pollution Ignition system Combustibility General Energy Heat transfer business Dust explosion |
| Zdroj: | Energy. 216:119197 |
| ISSN: | 0360-5442 |
| DOI: | 10.1016/j.energy.2020.119197 |
| Popis: | Pulverised coal in industrial sites and their dust can experience spontaneous combustion and self-heating, increasing the risk of fire and dust explosion. The main objective of the present study was to resolve thermal combustibility (as reflected by comprehensive combustibility index [Sn] and kinetic properties) for three types of coal (S1-BN, S2-CY, and S3-JM) through thermal analysis. The Sn values of the samples indicated a degradation in the quality of comprehensive combustibility. Apparent activation energies (Ea) at the initial stage of spontaneous coal combustion (130–300 °C) were decided through Achar and Coats–Redfern methods. Moreover, thermal susceptibility (minimum auto-ignition temperature [MAIT] and thermodynamic parameters) was evaluated using the hot plate method. The MAIT values for the three coal dust layers were 210, 220, and 300 °C. The results exhibited that heat conduction was the dominant heat transfer mode that originated the temperature distribution within the coal dust layer under the subcritical conditions for ignition; while it converted chemical reaction controlled-mode after thermal runaway. Furthermore, the results based on an improved risk matrix approach showed the S1-BN and S2-CY samples had a high self-ignition risk, whereas the S3-JM sample had a moderate ignition risk. |
| Databáze: | OpenAIRE |
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