The document outlines the components and functions of an ash handling system in thermal power plants, detailing types of ash such as bottom ash, coarse ash, and fly ash. It describes the processes for handling, transporting, and utilizing ash, including its use in concrete production and soil stabilization. The document emphasizes the necessity for an efficient ash handling system due to the significant amount of ash produced as a byproduct of coal combustion.

1. ASH HANDLING SYSTEM
REPRESENTED BY:
CHAUHAN KANDARP(170140119009)
KALE SHUBHAM M(170140119026)
KARDANI DEEP R. (170140119030)
MISHRA HIMANSHU(170140119048)

2. Ash
 Ash is the residue remaining after the coal is
incinerated.
 Composition of Ash: -
 SiO2 .Al2O3 .Fe2O3 .CaO. MgO

4. Ash Handling System
 The ash handling system handles the ash by
bottom ash handling system, coarse ash handling
system, fly ash handling system, ash disposal
system up to the ash disposal area and water
recovery system from ash pond and Bottom ash
overflow

5. Parts of Ash Handling System
 Bottom Ash Handling System
 Coarse Ash (Economizer Ash) handling system
 Air Pre Heater ash handling system
 Fly ash handling system
 Ash slurry disposal system

6. Bottom Ash
Handling System
 Bottom ash resulting from the
combustion of coal in the boiler
falls into the over ground,
refractory lined, water
impounded, maintained level,
double V-Section type/ W type
steel- fabricated bottom ash
hopper having a hold up volume to
store bottom ash and economizer
ash of maximum allowable
condition with the rate specified.
The slurry formed is transported
to slurry sump through pipes

7. Coarse Ash (Economizer Ash) handling
System
 Ash generated in Economizer hoppers is
evacuated continuously through flushing boxes.
 Continuous generated Economizer slurry is fed by
gravity into respective bottom ash hopper pipes
with necessary slope.

8. Air Pre Heater ash handling system
 Ash generated from APH hoppers is evacuated once in a shift by vacuum
conveying system connected with the ESP hopper vacuum conveying system.

9. Fly Ash Handling System
 Fly ash is considered to be collected in ESP Hoppers.
 Fly ash from electrostatic precipitators or fabric bag filters (or sometimes
both), located at the outlet of the furnace and before the induced draft fan,
is extracted by Vacuum Pumps.

10.  Electrostatic precipitators or fabric bag filters (or sometimes both) located at
the outlet of the furnace and before the induced draft fan.
 Generally, the fly ash is pneumatically transported to storage silos for
subsequent transport by trucks or railroad cars

11. The ways of fly ash utilization include
 Concrete production, as a substitute material for Portland cement and sand
 Embankments and other structural fills (usually for road construction) Waste
stabilization and solidification.
 Cement clinkers production - (as a substitute material for clay) •Mine
reclamation
 Stabilization of soft soils
 As Aggregate substitute material (e.g. for brick production) •Mineral filler in
asphaltic concrete
 Agricultural uses: soil amendment, fertilizer, cattle feeders, soil stabilization
in stock feed yards, and agricultural stakes
 Loose application on rivers to melt ice.

12. Ash Slurry Disposal System
 Bottom Ash slurry, Fly ash slurry and the Coarse Ash slurry shall be pumped
from the common ash slurry sump up to the dyke area which is located at a
distance from Slurry pump house.

13. Requirement of Ash Handling System
 In Thermal Power Plant’s coal is generally used as fuel and
hence the ash is produced as the byproduct of
Combustion.
 Ash generated in power plant is about 30- 40% of total
coal consumption and hence the system is required to
handle Ash for its proper utilization or disposal.

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