ash handling
Post on 19-Nov-2014
388 Views
Preview:
TRANSCRIPT
ALTERNATIVES
BOTTOM ASH SYSTEM
FLY ASH SYSTEM
SLURRY DISPOSAL AND ASH WATER RECOVERY SYSTEM
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 spaceProven for Indian coal
Water requirement is highInvolves lot of piping and valves.
3. Using air cooling system
No water usageClean system
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 vaccum results in reduction of capacity
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
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
Bottom ash hopper
Scrapper conveyor
Clinker Grinder
Belt Conveyor
Bottom Ash Silo
Vibrating feeder
Truck
Provided with refractory lining
Capacity 36 TPH
4 hours storing capacity
Total number=2(1w+1s)
http://www.bsbkgroup.com/flash/movie6.htm
Single/Double roll clinker grinder which crush <25 mm
Rolls will be of Cast Chrome Vanadium-Molybdenum wear resisting steel
Number=2
Belt Width=650mm
Troughing angle=350
Speed=1m/s
One bottom ash silo for both units
Capacity =600 T
12 hours storing capacity
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
APH/ECO/ESP HOPPER
INTERMEDIATE SURGE HOPPER
TRANSMITTER VESSEL
FLY ASH SILO
SPOUT/ASH CONDITIONER
CLOSE/OPEN TRUCK
2Nos (1W+1S)
Capacity=108 T
Vent filter to discharge clean air
Pressure is created in transmitter vessel
Fluidisation using air blower is carried out
Size of vessel is depends on number of cycles
Capacity=1500 T
2 Nos
Storage Capacity=14hrs
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
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.
SILO
SLURRY PUMP
SETTLING POND
STILLING POND
VERTICAL TURBINE PUMP
CLARIFLOCULATOR
ASH WATER TANK
Horizontal, centrifugal type Capacity = 450 m3/hr
No. of pumps = 3(2W+1S)
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
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.
Combination of Clarifier and Flocculator Suspended solids limited to 20ppm
Clear water is led to Ash Water tank
CONTENTS
top related