Eurosilo versus Dome

Monday, 29 August 2011 08:40 Last Updated on Monday, 29 August 2011 11:09 Written by Julia Ruijgrok

	EUROSILO STORAGE	DOME STORAGE
FOOTPRINT	The most compact way of enclosed storage. 2 x 75000 tons of coal - diameter 55 m = 2 x 2375 m² = 4751 m² = 50%	Large footprint compared to stored volume of coal. 150000 tons of coal - diameter of 110 m = 9500 m²
FILLING	The coal is stored layer by layer and evenly spread by an auger system. By this movement the coal is even additionally homogenized.	The coal is dropped down by a belt conveyor and will segregate, fines inside and coarse particles outside. This may give problems for the mills afterwards.
DISCHARGING	The coal is discharged layer by layer by the auger system. This process is fully automated.	The coal is discharged by a scraper system. This system runs partially automated.
OXYGEN ACCESS	The coal is evenly spread in the silo system. Oxygen access is only possible through the top surface. The tendency for self-heating is reduced due to the low oxygen concentration inside the coal volume. The coal in the lower layers is even self-inerting.	The coal is segregated and has a large open surface for oxygen access. Self-heating of coal can occur frequently.
NITROGEN PURGING	Nitrogen purging through the silo bottom and upward is a well proven fire protection matter.	Nitrogen purging is not possible.
STRUCTURE	The coal is always levelled, so the loads are circular symmetric which is the optimal load situation. Resulting in a simple straight-on cylindrical (slip) form wall.	Large concrete wall structure due to uneven loads on the retaining walls.
COAL TYPES	Different coal types can be monitored by the coal silo software system. They can be reclaimed in a reverse sequence without loss of space.	Different coal types can only be stored in separate piles. Resulting in a loss of space due to the conical pile heads.
COAL MONITORING	The coal is continuous monitored by CO, NH4 and O2 sensors located on the auger frame and slewing bridge. The CO- concentration is the best indication for a developing hot-spot. The control system can indicate where the hot spot is located to enable the operators to treat this spot with the firesorb gel.	Monitoring of the coal self-heating can only be done by infra-red cameras and a non-selective gas detection.
BLENDING	With two or more silo systems it is easy to blend by discharging and proportioning simultaneously from the silo systems.	Realisation of blending is hardly possible.
FUEL MANAGEMENT	With the fuel management program the coal storage is monitored and the coal handling can be controlled in an optimal way.	Due to the undefined geometry of the pile configuration a detailed monitoring is complicated.
REDUNDANCY	With two or more silo systems there is a redundancy.	Large capacity in one system, no redundancy.

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