The risk of coal getting self-ignition due to storage at a temperature of above 20°C is always possible. It is recommended for timing of storage and height of storage by experts as per the quality of coal.
Timing of storage:
Heights of non-compressed coal stockpiles
The general standards for cement plant is that the height should not exceed 5 m for easy handling of coal and to save from self-ignition.
For coal that is to be stored over a longer period of time, two different storage methods can be distinguished with respect to reducing the danger of self-ignition:
- Non compacted stockpiles with good internal ventilation due to their limited height.
- Well compacted stockpiles by compressing the coal with bulldozers or rollers in order to prevent as much as possible air from entering into the interior of the depot.
Notes
- Different types of coal are still best stored in different piles
- Material should be reclaimed vertically to keep newly exposed surfaces to a minimum
- The side slopes of the pile are the most exposed; the slope should thus be especially carefully sealed, particularly on the sides exposed to the wind.
- Piles of high volatile coals should be limited in size in order to contain any fires occurring and make them easier to extinguish
