short ppt on the topic for an overview on the topic and useful for students of mechanical engineering student who have studies the ash handling system in their academics.
Roadmap to Membership of RICS - Pathways and Routes
Ash handling system
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
3.
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.