Coal dust
Coal dust is powdered brown or hard coal . This dust arises during the mining process of the coal in the deposit or the dust is specifically produced in grinding plants. Coal dust has a maximum particle diameter of 0.5 mm. Carbon particles with a coarser particle size are small coal called.
Coal dust is used for firing in power plants as well as for the production of briquettes ( domestic fuel). Occasionally it was used in steam locomotives until the 1970s . Since it can be made from the smallest grades , it is a relatively cheap energy source. The advantage of dust over grate firing with industrial briquettes is the ability to quickly adapt to required fluctuations in output. Coal-fired power plants that fire with coal dust generate the dust on the spot.
Coal dust forms an explosive mixture with air in certain concentration limits and can lead to dust explosions . This requires special measures for transport and storage.
The following lower and upper explosion limits in air are specified for lignite from the Lower Rhine region : LEL = 40 g / m 3 , UEL = 7000 g / m 3 .
Web links
- Coal dust test provisions - provisions for testing and assessing the explosiveness of coal dust, Landesoberbergamt NW, Dortmund, May 27, 1974 (40 liter test chamber, 200 m explosion section).
Individual evidence
- ↑ E. Wolfrum, E. Scherrer: Braunkolenstaub - Properties and safety aspects when using it ( memento of the original from September 29, 2016 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. Zement-Kalk-Gips, No. 8, 1981, 134th volume, pp. 417-423.
