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Modes of transport

Roadways

Railwys

ropeways

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roadways

Coal is carried in trucks and a truck can carry

about 8-10 tons of coal. But dueto low

capacity, low unloading rate and time

consuming, this mode is not in much use

forlarge thermal power stations.

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coal is brought by railway wagons. One rack

consists of 58 wagons. Eachwagon contains 58

MT of coal. Locos bring the wagons from the

marshalling yard and placethem on wagon

tippler. These wagons are then unloaded with

the help of wagon tippler.

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railwys

Wagon tippler

BOBR

Apron feeder

Track hopper

Paddle feeder

Side

Ring

type

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Trcki hopper

Track hopper system : This system is provided

for BOBR(bottom opening wagons) wagons

are unloaded in track hoppers. The holding

capacity oftrack hoppers is 4500 MT.

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Equipments used in CHP

Conveyer belts Belttensioning

Screw type

Gravity take

ups

Rubber

scrapers

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Idlers

Idlers consist of three rollers attached to thebrackets at an angle of 20-350 so that conv. beltcan take shape like a arc of a circle, thuspreventing objectionable sharp bends to the belt

and carries maximum coal load without anyspillage. Carrying Troughing Idlers

Return Idlers

Carrying Self-Aligning Idlers Return Self Aligning Idlers

Impact Idlers

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Pulleys

Conveyor pulleys are heavy cast iron constructionhaving machine crowned faces, the driving pulleybeing faced with ferodo or other similar friction

material. The diameters of pulleys are large enough to

reduce belt stresses.

Head Pulley

Tail Pulley Snub Pulley

Tripper Pulley

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Coal Feeders

Electro-magnetic feeders

Vibrating Screens

Coal Crushers

Primary Crushers

Secondary Crushers

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Trippers

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Magnetic Separators

These are provided to get rid of foreign material (i.e.tramp iron) which finds its way into the coal. Thepoints requiring attention for magnetic separation tobe efficient are depth of coal on belt and speed of the

belt. Suspended Magnets

Rotating Magnets

Magnetic Pulleys

Non magnetic materials like stones, shells etc. areremoved manually from the running belt.

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Protections

Pull chord switch This protection does not work automatically but is to be operated

manually by the operator when he senses some severe disaster. Thispull chord can be operated from any position along the length of theconveyor belt.

Belt sway switch These are mounted on the conveyors and protect the belt from

excessive running out and getting edge worn/damaged.

Zero speed switch When the speed of the conveyor drops below predetermined speed, it

operates and trips the system to save it from congestion at the

transfer points. It is usually fixed nearer to the tail pulley. Interlocks

If one of the belts trips for any reason, all earlier belts will trip on autoalong with the associated vibrating feeders provided at input points.