8/11/2019 aug 25.pptx
1/13
8/11/2019 aug 25.pptx
2/13
Modes of transport
Roadways
Railwys
ropeways
8/11/2019 aug 25.pptx
3/13
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.
8/11/2019 aug 25.pptx
4/13
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.
8/11/2019 aug 25.pptx
5/13
railwys
Wagon tippler
BOBR
Apron feeder
Track hopper
Paddle feeder
Side
Ring
type
8/11/2019 aug 25.pptx
6/13
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.
8/11/2019 aug 25.pptx
7/13
Equipments used in CHP
Conveyer belts Belttensioning
Screw type
Gravity take
ups
Rubber
scrapers
8/11/2019 aug 25.pptx
8/13
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
8/11/2019 aug 25.pptx
9/13
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
8/11/2019 aug 25.pptx
10/13
Coal Feeders
Electro-magnetic feeders
Vibrating Screens
Coal Crushers
Primary Crushers
Secondary Crushers
8/11/2019 aug 25.pptx
11/13
Trippers
8/11/2019 aug 25.pptx
12/13
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.
8/11/2019 aug 25.pptx
13/13
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.
Top Related