ash handling system.ppt

7/27/2019 Ash Handling System.ppt

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Ash Handling SystemWhat are the types of Ash in Thermal Power

Plant ?

Bottom Ash

Fly Ash

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Bottom AshThe ash which is directly collected from

bottom of boiler.

Bottom ash directly falls down in waterfilled bottom due to gravity.

Bottom ash is 20% of total ash.


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Fly AshIt is collected from :-

1-ESP hoppers

2-Air preheaters hoppers

3-Economiser hoppers

It is 80% of total ash.


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Wet systemIn this system ash conveying media is

water.

It has two main component:-

1-Hydro-vactor

2-Hydro-ejector


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Hydro-vactorWorking Principle:-

Hopper ash is directly sucked by

vaccum, which is created by high water

Jet (hydrovactor).

This ash mix with water in collectingtank and finally slurry collects in slurrysump.


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Hydro-ejectorWorking Principle:-

High pressure water jet carriesslurry from the bottom to slurry sump.

This system operates once in a day

(24 hrs).


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Final disposal of slurryFinally slurry from slurry sump is

conveyed by pair of big centrifugal

pumps to Ash ponds.

This slurry system is common

1-for D & E station2-for C & F station


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Fly Ash in Forestry

Ash pond No1


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Fly Ash in Forestry

Ash pond No

1


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Fly Ash in Forestry

Ash pond No2


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Different Auxillaries in wet

system (Fstation)1-H.P. pump 3 Nos. 11 kg/cm2

2-L.P. pump 3 Nos. 6 kg/cm2

3-Ash slurry pump 3 Nos. in each path2.5 kg/cm2

4-Air washer pump 2 Nos. 5 kg/cm2

5-Seal water pump 2 Nos. 18 kg/cm2


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What is the need of dry

system?It has some good characteristics over

the wet system:-

1-Huge quantity ofwater is saved.

2-Power consumption is less.

3-Reduction in surface pollution.

4-Earning, by selling dry ash to cementfactory & bricks manufacturer.


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Components of dry system

K-pump

P.D.pump

Centac compressor

Acher silo


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K-pumpIt is nothing but the combination of

silo,Transfer vessel,Dispencing vessel &

Centrifugal compressor.

D & E station has common K-pump

C & F station has another common K-pump.


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Working Principle of K- pumpIt works on the principle ofpressure

difference.

Its operation is sequential ,becauseDome Valves from DV-1 to DV-6

operate in sequence.


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Acher SiloFinally Dry ash is disposed to acher silo

which is located in AEC campus.

These are 2 in nos.

Each has capacity of750 ton .

INTEGRATED FLY ASH HANDLING SYSTEM: (Schematic flow diagram)


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INTEGRATED FLY ASH HANDLING SYSTEM: (Schematic flow diagram)Stage- I

C stn. F stn.

Fly ash Fine Ash Fly ash

Hoppers Silo (New) Hoppers

130 Cu.Mtr.

( 'C' stn)

30 TPH

(After rehibilitation)

Stage-II 80 TPH

80 TPH

Stage-I

Fine Ash

Silo (New) E stn. D stn.

130 Cu.Mtr. Fly ash Fly ash

('D/E' stn) Hoppers Hoppers

80 TPH

80 TPH

Stage-II 80 TPH

To final ash disposal area by closed tanker / truck

Exist.

Recip

Compr

Compr.

FINAL FLY ASH

STORAGE SILO AT

ACHER

Capacity :

750 Cu.Mtr.

FINAL FLY ASH

STORAGE SILO AT

ACHER

Capacity :

750 Cu.Mtr.

Stage II

CentrifugalCo

mpr.

C 1 Existing

Silo

(Cap:350 T)

F stn.

Intm.

Hopper

D/E Exist.

RCC Silo

(Cap :450 T)

Stage I

Centrifugal

Compr.

Stage I

Centrifugal

Compr.

Stage II

Centrifugal

Compr.


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Loading of trucks & tankers at

acherThere are 2 system of loading :-

1-For truck - water spray system

2-For tankersby gravity

D A h l di t A h


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Dry Ash unloading at Acher

Ash collection in closed tanker at Acher silo

D A h l di t A h


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Dry Ash unloading at Acher

Ash collection in closed tanker at Acher silo


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Use of Fly AshFor building construction

For Cement manufacturing

For bricks manufacturing

Ash customers:-

1-Gujrat ambuja cement

2-Binani cement, laxmi cement

3-GCL (RCC pipe mfg.)

Fl A h d i Bld M t


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Fly Ash used in Bldg. Mat.

PrivatePrivatePrivate Bungalow Gadhinagr

Fl A h d i Bld M t


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Fly Ash used in Bldg. Mat.

Ghodasar Shriji Complex

Const ction


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Construction

RCC road near D.M. Plant area

Construction


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Construction

RCC road from Crusher house to Coal JN - M


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Future strategiesNow a days we are using almost dry

system.

In future our planning is to stop wholewet system except bottom ash which isonly 20%.

For loading trucks & tankers we arethinking about loading in night shift too.


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ash handling system.ppt

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