ASH HANDLING SYSTEM

SUBMITTED BY-1) Akshay Kumar Yaday (R630211006)2) Amay Jain (R630211007)3) Aniket Bhattacharya (R630211008)4) Animesh Gupta (R630211009)5) Anukriti (R630211011)

AshAsh is the residue remaining after the coal

is incinerated.Composition of Ash:

- SiO2 .Al2O3.Fe2O3.CaO. MgO

Ash Handling SystemThe 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.

Parts of Ash Handling System

Bottom Ash Handling SystemCoarse Ash (Economizer Ash) handling

systemAir Pre Heater ash handling systemFly ash handling systemAsh slurry disposal system

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.

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.

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.

Fly Ash Handling SystemFly 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.

•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

Figure: Fly-Ash Washing

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•Loose application on roads and parking lots for ice control•Other applications include cosmetics, toothpaste, kitchen counter tops, floor and ceiling tiles, bowling balls, etc

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.

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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