Ash Handling

1. Alternatives
Bottom ash system
Fly ash system
Slurry disposal and ash water recovery system

2. S.I
NO
Alternative Merits Demerits
1. Using scraper chain
conveyor and belt
conveyor
•Dry form
• Simple
•Less water
requirement
•Proven for Indian
coal.
•Space
requirement is
high
•Chains require to
be good quality.
2. Using jet pumps Less space
Proven for Indian coal
Water requirement
is high
Involves lot of
piping and valves.
3. Using air cooling
system
No water usage
Clean system

3. S.I .
NO
Alternative Merits Demerits
1.
Dense phase
pneumatic system
•Conveying speed
is low.
•Wear and tear is
minimum.
Free movement space is
limited below ESP area
2.
Vacuum type
pneumatic system
Clear space is
available below
ESP area.
•Conveying speed is high
•Wear and tear is high
•Fall in vacuum results in
reduction of capacity

4. S.I. NO ALTERNATIVE MERITS DEMERITS
1. Lean Slurry Disposal
System(LSDS)
•Silo area layout
is simple
•Cheaper
•Large quantity of
water required
•Civil cost is high
2. High Concentration
Slurry Disposal
System(HCSDS)
•Less water
consumption
•Less disposal
area is required
Requires more
space near silo

5. BOTTOM ASH HANDLING SYSTEM
Scrapper Chain and Belt Conveyor
FLY ASH HANDLING SYSTEM
Dense Phase Pressure type
ASH DISPOSAL SYSTEM
Lean Slurry Disposal System
CONTENTS

6. Bottom ash hopper
Scrapper conveyor
Clinker Grinder
Belt Conveyor
Bottom Ash Silo
Vibrating feeder
Truck

7. Provided with refractory
lining
Capacity 36 TPH
4 hours storing capacity

8. Total number=2(1w+1s)
http://www.bsbkgroup.com/flash/mov
ie6.htm

9. Single/Double roll clinker
grinder which crush <25 mm
Rolls will be of Cast Chrome
Vanadium-Molybdenum wear
resisting steel
Number=2

10. Belt Width=650mm
Troughing angle=350
Speed=1m/s

11.  One bottom ash silo for both
units
Capacity =600 T
12 hours storing capacity

12. Capacity 240 TPH
Feeder trough will be
provided with 10 thick
TISCRAL/Sail hard liners
Vibrating feeder consists of
vibrating frame, spring,
vibrator, motor vibrating
device and motor
CONTENTS

13. APH/Eco/ESP Hopper
Intermediate Surge Hopper
Transmitter Vessel
Fly Ash Silo
Spout/Ash Conditioner
Close/Open Truck

14.  2Nos (1W+1S)
 Capacity=108 T
Vent filter to discharge clean air

15.  Pressure is created in transmitter
vessel
 Fluidisation using air blower is
carried out
Size of vessel is depends on
number of cycles

16. Capacity=1500 T
2 Nos
Storage Capacity=14hrs

17.  Provided on two of the outlets on
each of the silos
 Telescope into inlet of container
trucks thus reducing dust nuisance
 Fitted with level probe

18. CONTENTS
Ash feed rate from the ash storage silo is
precisely controlled.
Water spray feed rate is adjusted by control
valves.
The conveying action provided by the rotating
paddles provides continuous flow of uniformly
mixed ash with no excess water or dusting.

19. Silo
Slurry Pump
Settling Pond
Stilling Pond
Vertical Turbine Pump
Clariflocculator
Ash Water Tank

20. Horizontal, centrifugal type
 Capacity = 450 m3/hr
No. of pumps = 3(2W+1S)

21.  Provided with HDPE
 70% of water can be recovered
 Slurry settles due to residence in
settling pond
 Partial clear water then goes to
stilling pond
 Remaining ash settles in stilling
pond

22. Used wherever a liquid need to
be pumped upwards
Used to moderate to high
pressure applications
Used in open bodies of liquids
such as oceans, lakes, cooling
ponds.

23.  Combination of Clarifier and
Flocculator
 Suspended solids limited to
20ppm
 Clear water is led to Ash Water
tank
CONTENTS