Ash Handling

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