presentation by ete's_ash handling systems

8/8/2019 Presentation by ETE'S_ash Handling Systems

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Ashy Fly Ash & Bottom Ash

y Fuel, combustion methods,

flue gas treatments andboiler designs

y Fly Ash composition:



ASH HANDLINGy Method of collection, conveying, interim storage and

load out of various types of ash residuey Ash handling can be of two types

y Dry

y Wet

y Fly ash handling can either be dry or wet

y Bottom ash handling is generally wet until recently because

of its higher particle size (around 25 mm )y Fly ash can either be fine or course

y Fine fly ash has particle size form 50 200 micron whereascoarse fly ash has particle size greater than 200 micron .



BOTTOM ASH HANDLINGBOTTOM ASH H ANDLING

SYSTEMS

WATER IMPOUNDEDHOPPER

SUBMERGEDSCRAPER

CONVEYOR

DRY BOTTOM ASH SYSTEMS

WETDISPOSAL

WETDISPOSAL

DRY COLLECTION



WATER IMPOUNDED HOPPERy Old process

y Huge water consumption

y Receives, quenches,stores crushes andremove bottom ash

y Ash is discharged once in

6 to 8 hoursy Clinker grinder is

situated below it



RECIRCULATION SYSTEM



BOTTOM ASH HANDLING-SSCy SSC is placed beneath

the furnace

ySlurry is taken up to ade-watering slope beforedischarging

y Water serves as cooling

mediumy Water also acts as airlock

for ash hoppers to avoidair to enter the furnace



SSC contd.y Reduced water usage

y Reduced powerconsumption

y Reduced operational andmaintenance cost



Dry bottom ash handlingy Water is not used

y Increased boiler

efficiency y Reduced impurities

in stack

y Low maintenancecost and no waterrequired



ADVANTAGES OF DRY HANDLING OVER SSC



FLY-ASH HANDLING



FLY-ASH HANDLING

FLY ASH SYSTEMS

PRESSURECONVEYING

SYSTEM

DENSEPH ASE

DILUTEPH ASE

VACUUM SYSTEM

DILUTEPH ASE



PRESSURE SYSTEM

OPERATING PRESSURE IS 5 Kg/cm2



VACUUM SYSTEM

OPERATING PRESSURE IS 530mm



COMBINED PRESSURE AND

VACUUM SYSTEM



Comparison



Dilute Phasey Both vacuum & pressure

pneumatic systems

yHigh velocity

y low ash - to - air ratio



Dense phasey Pneumatic pressure

system conveying dense

ashy Low velocity

y High ash concentration

y Less energy due to its

smaller amount of conveying air



GENERAL DESIGN ASPECTSy Boiler design and configuration

y Disposal conditions

y Water availability y Type of coal

y Design capacity



ASH DISPOSAL SYSTEMS.I. NO ALTERNATIVE MERITS DEMERITS

1. Lean Slurry DisposalSystem(LSDS)

Silo area layoutis simpleCheaper

Large quantity of water requiredCivil cost is high

2. High ConcentrationSlurry DisposalSystem(HCSDS)

Less waterconsumptionLess disposalarea is required

Requires more spacenear silo



High Concentration Slurry Disposal

(HCSD)y Controlled and monitored

feeding for fly ash andbottom ash

y Agitator Retention Tank(ART).

y Carbon steel pipelines

y Higher concentration of about 60%



Advantagesy Ash spreads in layers enabling vertical filling, hence

land requirement is reduced.

y Pumping at higher concentration, hence low waterconsumption.

y Slurry flow rate is drastically reduced.

y Literally no water releases out, hence no waterretaining dams or recovery system is required.

y Reduced leaches at the ash disposal area.y Lower operating power consumption.

y Lower velocity, hence longer life for pipe line.



FLY ASH DISPOSAL SYSTEMSLandfill: big bags



Embankment: ash placement



Embankment: top liner



Foundation: asphalt cover



Landfill: cover soil removed

Workshop Implementation of the Landfill Directive, 15thM

ay 2009, Tallinn, Estonia



Ash Bricks



ASH PONDS



SLURRY DISOPOSAL AND ASH

WATER RECOVERY SYSTEMHOPPER

SLURRY PUMP

SETTLING POND

STILLING POND

VERTICAL TURBINE PUMP

CLARIFLOCULATOR

ASH WATER TANK



ASH STORAGE SILOS

The Ash coming out of the unloading chute istransferred to waiting trucks for various uses



ADVANTAGESOF SILO SYSTEMy Commercial utilization of ash in :

Cement additives.

Brick plants.

Road making, etc.

y Saving of water a precious commodity.

y High reliability

y Least maintenance



Contd.y Environment concern:

In a period, when environmental protection andawareness is a major industrial and social concern,

Dense Phase pneumatic conveying, by totally enclosedhandling system, is particularly amenable to theenvironment.

All conventional problems of spillage, dust,contamination and storage are efficiently andsuccessfully eradicated.



ASHGAT

E &HOUSIN

GThe Ash Gate and Housinginstalled below the bottom ash

storage hopper.

It controls the discharge from thestorage hoppers.

The gate operation is controlledhydraulically, providing a smoothoperation when opening and tightseating when closed.



CLINKER GRINDERy Coarse bottom ash or

other coarsely sizedmaterial

y Reduce size forpneumatic conveyanceor other means of ashhandling.



CYCLONESy Centrifugal ash receiver

y Top of a silo or storage hopper

y

The gases after reaching the endof the conical portion changes itsdirection and moves upwardstowards the outlet forming aninner vertex.

y Control high concentration.



PULSE JET DUST COLLECTORS

y Receives the overflow airstreamfrom the ash receiver

y Collects ash particulates on the

surface of multiple fiber bagsy Clean (filtered) air overflows the

top of the dust collector, passingto the atmosphere or other

processing.



ASH CONDITIONERS

y The ash conditioner is a totally

enclosed, paddle type mixer

designed to condition fly ash,

bottom ash, and other abrasive or

dusty materials.

y The unit (coupled with a rotary

feeder) features the ability to

accurately control both the

material feed rate and the water

supply flow rate, as well as ensure

a complete and controlled mixing

prior to discharge.



SLURRY PUMPSy The slurry solution is pumped using it

to land fill or transported to a slurry

to lagoon for storage/disposal.

y Agitator pumps deliver kinetic energy

(energy of motion) to slurry

solids surrounding the pump intake,

re-suspending them into a fluid state.

y The slurry may be subsequently used

for a number of applications such as

in the building industry, for Cement

and Block production



High Pressure Ash Jet Pumps

y High pressure ash jet pumps are used to remove the clinker formed on the wall of furnaceby supplying water jet.

y Jet pumps works on a venturiprinciple. High pressure water delivered through the nozzlecreates vacuum.



ASH UNLOADERSy Telescopic Unloading Chute

y A knife gate is fitted to the ash silo

bottom

y Telescoping interlocking cones which are encapsulated by a

fabric/elastomeric dust annulus

y Induced air flow generated by a

suction fan

yBag type pulse jet dust collector.



PIPELI E PRODUCTS y Terminal Box : Used as a low profile

conveying pipeline termination to divertthe material flow tangentially into thetop of a silo / hopper. Standard size rangeto accommodate 50mm to 400mmdiameter pipelines.

y Dump Valves :y Used as a silo / hopper feeding valve

within the conveying pipeline.y Located on the silo / hopper roof it

diverts the material flow into the top of astorage hopper / silo or in it's by-pass

position allows the material f low to passthrough to a second storage hopper /silo.

y The sleeve design of Valves auto cleans with every cycle of operation on the gateor valve port because the sleeve will f lexto allow grits and solids to pass through .



Valves and Bendsy Switch Valvey To connect pipelines together either

in converging or divergingconfigurations.

y The most commonly used for the

Power Industry is the Dome Switch Valvey Bendsy Size range 50mm to 400mm diameter

pipelinesy Cast Ni-hard, Grade 250 iron or

basalt-lined mild steel bends areused.y For very abrasive slurries alumina

ceramic-lined mild steel bends areused



PIPESy Pipe : Standard Size range 50mm to 400mm diameter

pipelines.

y Conveying

Pipeline : Seamed mild steel pipe work (BS1387; BS3601; DIN2441/8; ANSI 836.1

standard pipe or equivalent) to construct the straightpipe sections . For long straight sections the pipeline isusually constructed by welded joints using 6-12 meterrandom pipe lengths depending on availability.



Requirement of BOPs During 11th

Plan



No. of Vendors In our Country

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