ash handlingash handling system system
DESCRIPTION
a brief overviewTRANSCRIPT
Ash Handling SystemWhat are the types of Ash in Thermal Power Plant ?
Bottom Ash
Fly Ash
http://studygalaxy.com/
Bottom AshThe ash which is directly collected
from bottom of boiler.
Bottom ash directly falls down in water filled bottom due to gravity.
Bottom ash is 20% of total ash.
Fly AshIt is collected from :-1-ESP hoppers2-Air preheaters hoppers3-Economiser hoppers
It is 80% of total ash.
Wet systemIn this system ash conveying
media is water.It has two main component:-
1-Hydro-vactor2-Hydro-ejector
Hydro-vactorWorking Principle:-
Hopper ash is directly sucked by vaccum, which is created by high water Jet (hydrovactor).This ash mix with water in collecting tank and finally slurry collects in slurry sump.
Hydro-ejectorWorking Principle:-
High pressure water jet carries slurry from the bottom to slurry sump.
This system operates once in a day (24 hrs).
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
Fly Ash in Forestry
Ash pond No –1
Fly Ash in Forestry
Ash pond No –1
Fly Ash in Forestry
Ash pond No –2
Different Auxillaries in wet system (‘F’station)
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 path 2.5 kg/cm2
4-Air washer pump 2 Nos. 5 kg/cm2
5-Seal water pump 2 Nos. 18 kg/cm2
What is the need of dry system?
It has some good characteristics over the wet system:-
1-Huge quantity of water is saved.2-Power consumption is less.3-Reduction in surface pollution.4-Earning, by selling dry ash to cement
factory & bricks manufacturer.
Components of dry system
K-pumpP.D.pumpCentac compressorAcher silo
K-pumpIt is nothing but the combination of
silo,Transfer vessel,Dispencing vessel &
Centrifugal compressor.D & E station has common K-pumpC & F station has another common
K-pump.
Working Principle of K- pump
It works on the principle of pressure difference.
It’s operation is sequential ,because Dome Valves from DV-1 to DV-6 operate in sequence.
Acher SiloFinally Dry ash is disposed to acher
silo which is located in AEC campus.
These are 2 in nos.
Each has capacity of 750 ton .
INTEGRATED FLY ASH HANDLING SYSTEM: (Schematic flow diagram)Stage- I
C stn. F stn.Fly ash Fine Ash Fly ashHoppers Silo (New) Hoppers
130 Cu.Mtr.( 'C' stn)
30 TPH
(After rehibilitation) Stage-II 80 TPH
80 TPH
Stage-I
Fine AshSilo (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.
Loading of trucks & tankers at acher
There are 2 system of loading :-
1-For truck - water spray system2-For tankers – by gravity
Dry Ash unloading at Acher
Ash collection in closed tanker at Acher silo
Dry Ash unloading at Acher
Ash collection in closed tanker at Acher silo
Use of Fly AshFor building constructionFor Cement manufacturingFor bricks manufacturing Ash customers:-1-Gujrat ambuja cement2-Binani cement, laxmi cement3-GCL (RCC pipe mfg.)
Fly Ash used in Bldg. Mat.
Private Private Private Bungalow Gadhinagr
Fly Ash used in Bldg. Mat.
Ghodasar Shriji Complex
Ash used in RCC road Construction
RCC road near D.M. Plant area
Ash used in RCC road Construction
RCC road from Crusher house to Coal JN - M
Future strategiesNow a days we are using almost dry
system.In future our planning is to stop
whole wet system except bottom ash which is only 20%.
For loading trucks & tankers we are thinking about loading in night shift too.