coal handling stages - hiren patel

8/3/2019 Coal Handling Stages - Hiren Patel

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BY

HIREN PATEL

MBA-POWER MANAGEMENT


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COAL HANDLING STAGES

1. Coal delivery

2. Unloading

3. Preparation

4. Transfer

8. Furnace Firing

7. Weighing and

Measuring

6. In plant Handling

5. Storage


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COAL DELIVERY

From the supply point the coal may bedelivered to the power station through

1. Rail Goods Train

2. Road Dumper Trucks

3. Sea Ships and pipelines

Ropeways are also used if mines are

near.


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The type of coal unloading equipment used in the

plant depends upon the type of out-plant handling

mode as road, rail or ship.

The unloading equipment normally used is given

below:i. Portable conveyors

ii. Coal towers unload rail wagons

iii. Unloading bridges beams to unloads cargo from ship

iv. Self unloading boats

UNLOADING


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PREPARATION If the coal when delivered is in the form

of lumps, the coal preparation may becarried out by:i. Breakers

ii. Crushers

iii. Coal accelerators - fractures the coal

iv. Dryers

v. Magnetic separators

vi. Coal Grinders or Coal Pulverizer


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TRANSFER Transfer means the handling of coal

between the unloading point and thefinal storage point from where it isdischarged to the fire equipment.

The following equipment may be usedfor transfer of coal:1. Belt conveyors

2. Screw conveyors

3. Vee bucket elevators and conveyors4. Pivoted bucket conveyor


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TRANSFER Cont

5. Grab bucket conveyors

6. Flight conveyors or chain type conveyors(

or scrapers) heavy weight and moisture

and dust contain coal7. Skip hoists

8. Mass flow conveyors

9. Chutes, hoppers


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STORAGE OF COAL

The following points should be considered:

y There should be no standing water near the storage area.y Well-drainage ditches should be installed.

y Storage area should be solid and not loose or porous.

y Piles should be built up in successive layers and as far aspossible compact.

y Conical piling should be avoided.

y handling cost is minimum.

y At storage site fire fighting equipment is mandatory.

y Live Storage is a covered storage provided in plants,sufficient to meet one day requirement of the boiler.Bunkers made of steel or reinforced concrete are used to

store the coal; from here the coal is transferred to theboiler grates.


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INPLANT HANDLING

It may refer to any one of the following:i. Coal handling between the final storage and the firing

equipment.

ii. A conveyors system to feed coal from any bunkersection to any firing unit and to move coal from onebunker section to another.

iii. Inplant handling may mean no more than chutes todirect flow into individual firing units and gates or

valves to control the flow.


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WEIGHING AND MEASURING

For weighing and measuring the coal at

different stages the following equipment

is used:

i. Weigh bridge

ii. Belt scale

iii. Automatic scale sensors and measuring

instrumentation


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FURNACE FIRING

The two most commonly used method

for the burning of coal are

1. Stoker firing

2. Pulverized fuel firing


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BIBLIOGRAPHY

www.google.com

Text book of Power Plant engineering by R.K.Rajput

www.astralloy.com

http://www.indiamart.com/shubhamcorporation/coal.html http://indianpowersector.com/power-station/thermal-power-plant/

http://chanda.nic.in/htmldocs/coal.html


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THANK YOU!

coal handling stages - hiren patel

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