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| CESC Limited : Generation Division | Generating Power Since 1899 ... |
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| CESC : FUEL : SOLID WASTE : ASH | ||||||||||||||||||
| ASH | ||||||||||||||||||
| In PF fired
boilers, a major portion of the ash is collected as fly ash, in the ESP hoppers and the
rest as bottom ash collected in the boiler hoppers known as Bottom Ash Hoppers. Dry fly ash is conveyed pneumatically to ash silos from where it is unloaded, after proper moistening, on dumpers for disposal. Fugitive emission is thus controlled. Bottom ash is pumped into de-watering bins in the form of slurry. The water from the slurry is separated by decantation and recycled to form ash slurry. This “zero discharge” system in handling bottom ash thus gives rise to no effluent at all. . In older stations, ash from the boiler in the form of cinders is led to ash hopper where it is quenched by water and fed to ash conveyer belt by paddle ash extracter. This wet ash is conveyed to ash silos for disposal.
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