Program: Diploma in Mechanical Engineering (Semester: 5) Course: Power Plant Engineering Lecture 9 Unit 3: Steam and Gas Power Plants 3.2 Steam Power Plants -Fuel Handling Systems Presented by : Prof. Rushikesh Sonar, Sandip Polytechnic, Nashik

1. Program: Diploma (Mechanical)
Class: TY (ME) Semester: V
Course: Power Plant Engineering
Code: 22566
LECTURE 09:
Unit: 3. Steam & Gas Power Plants

2. 02
wwwwwwwwwwww....ssssaaaannnnddddiiiippppffffoooouuuunnnnddddaaaattttiiiioooonnnn....oooorrrrggggMechanical Engineering Department, Sandip Polytechnic, NashikMechanical Engineering Department, Sandip Polytechnic, NashikMechanical Engineering Department, Sandip Polytechnic, NashikMechanical Engineering Department, Sandip Polytechnic, Nashik
Name of theName of theName of theName of the Trainer : Prof. Rushikesh Deoram SonarTrainer : Prof. Rushikesh Deoram SonarTrainer : Prof. Rushikesh Deoram SonarTrainer : Prof. Rushikesh Deoram Sonar
Years ofYears ofYears ofYears of Experience : 10Experience : 10Experience : 10Experience : 10
DomainDomainDomainDomain Expertise : Mechanical EngineeringExpertise : Mechanical EngineeringExpertise : Mechanical EngineeringExpertise : Mechanical Engineering
Qualification: M.E. (Design Engineering)Qualification: M.E. (Design Engineering)Qualification: M.E. (Design Engineering)Qualification: M.E. (Design Engineering)
Contact Details:Contact Details:Contact Details:Contact Details:
+91 9890481959+91 9890481959+91 9890481959+91 9890481959
rushikesh.sonar@sandippolytechnic.orgrushikesh.sonar@sandippolytechnic.orgrushikesh.sonar@sandippolytechnic.orgrushikesh.sonar@sandippolytechnic.org

3. 03Unit III: Steam & Gas Power Plants
TOPICS COVERED IN PREVIOUS LECTURE:
3.1 Steam Power Plants3.1 Steam Power Plants3.1 Steam Power Plants3.1 Steam Power Plants
* Introduction* Introduction* Introduction* Introduction
* Layout and Components* Layout and Components* Layout and Components* Layout and Components
* Working* Working* Working* Working
* Adv. & Disadvantages* Adv. & Disadvantages* Adv. & Disadvantages* Adv. & Disadvantages
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TOPICS TO BE COVERED IN THIS LECTURE:
3.2 Steam Power Plants3.2 Steam Power Plants3.2 Steam Power Plants3.2 Steam Power Plants
* Fuel Handling Systems* Fuel Handling Systems* Fuel Handling Systems* Fuel Handling Systems

4. 04Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
Coal delivery equipment is one of the major components of plant cost. The various steps involved in coal
handling are as follows :
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5. 05Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
1. COAL DELIVERY
The coal from supply points is delivered by ships or boats to power stations situated near to sea or river.
Coal is supplied by rail or trucks to the power stations which are situated away from sea or river.
The transportation of coal by trucks is used if the railway facilities are not available.
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6. 06Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
2. UNLOADING
The type of equipment to be used depends on how coal is received at the power station.
If coal delivered by trucks, there is no need of unloading device as the trucks may dump the coal to the
outdoor storage.
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outdoor storage.
In case the coal is brought by railways wagons, ships or boats, the unloading may be done by car shakes,
rotary car dumpers, cranes, grab buckets and coal accelerators.

7. 07Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
2. UNLOADING
Rotary car dumpers although costly are quite efficient for unloading closed wagons.
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8. 08Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
3. PREPARATION
When the coal delivered is in the form of big lumps and it is not of proper size, the preparation (sizing)
of coal can be achieved by crushers, breakers, seizers, driers and magnetic separators.
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Double Roller Crusher Jaw Crusher

9. 09Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
4. TRANSFER
After preparation coal is transferred to the dead storage by means of the following systems.
1. Belt conveyors
2. Screw conveyors
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2. Screw conveyors
3. Bucket elevators
4. Grab bucket elevators
5. Skip hoists
6. Flight conveyor

10. 10Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
It consists of an endless belt moving over a pair of end drums
(rollers). At some distance a supporting roller is provided at
the centre.
The belt is made up of rubber or canvas, suitable for the
transfer of coal over long distances.
4. 1 BELT CONVEYORS
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transfer of coal over long distances.
The inclination at which coal can be successfully elevated by
belt conveyor is about 20° with running Speed of 400-500
RPM
The initial cost of system is not high and power consumption
is also low.
Transport Capacity: 50-100ton/hour over long distance

11. 11Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
4. 1 BELT CONVEYORS
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12. 11Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
It consists of an endless helical screw fitted to a shaft. The screw while rotating in a trough transfers the coal from
feeding end to the discharge end.
This system is suitable, where coal is to be transferred over shorter distance and space limitations exist.
Rotation of screw varies between 75-125 RPM
4. 2 SCREW CONVEYORS
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Rotation of screw varies between 75-125 RPM
The initial cost of the consumption is high and there is considerable wear of screw.

13. 13Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
4. 2 SCREW CONVEYORS
It is used for shorter distance(30m).
Totally enclosed from atmosphere.
Coal dust can also be transferred easily.
Diameter: 15-50cm.
Speed: 70-120 rpm.
Transfer Capacity: 100tons/hour.
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Transfer Capacity: 100tons/hour.

14. 14Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
4. 3 BUCKET ELEVATOR
It consists of buckets fixed to a
chain. The chain moves over two
wheels.
The coal is carried by the bucket
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The coal is carried by the bucket
from bottom and discharged at
the top.
Coal is lifted vertically or near
vertical direction.

15. 15Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
4.4 GRAB BUCKET ELEVATOR
It lifts and transfers coal on a single rail or track from one
point to the other.
The coal lifted by grab buckets is transferred to overhead
bunker or storage.
This system requires less power for operation and requires
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This system requires less power for operation and requires
minimum maintenance.
The grab bucket conveyor can be used with crane or tower
as shown in Figure.
Although the initial cost of this system is high but operating
cost is less.

16. 16Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
4.5 FLIGHT CONVEYORS
It is generally used for transfer of coal when filling of
no. of storage bin under the conveyor is required.
The coal is discharged in the bottom of trough.
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The coal is discharged in the bottom of trough.
Transfer Capacity: 10-100 tons/hour.
Low capital cost and It can vary easily the rate of coal
discharge.
It has high energy consumption & maintenance cost.
Also high wear and tear due to dragging action.

17. 17Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
5. COAL STORAGE
It is desirable that sufficient quantity of coal should be stored.
It gives protection against the interruption of coal supplies.
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Storage of coal for a period of 30 – 80 days so that plant is
never required to be shut-down.
The amount of coal to be stored depends on the availability of
space for storage, transportation facilities, the amount of coal
near the power station.

18. 18Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
5.1 OUTDOOR (DEAD) STORAGE
The coal is usually kept on ground in the form of pile exposed to
outside weather.
The coal is required to be protected from deterioration &
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The coal is required to be protected from deterioration &
Weathering.
This is a long term storage i.e. 10% of annual consumption.

19. 19Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
6. CLOSED (LIVE) STORAGE
In the closed or live storage the coal is stored for one or two days as
per the requirement of the power plant.
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This storage is used for the purpose of supplying the coal to the
combustion equipment with negligible handling.
The coal is usually stored in the vertical cylinder bunkers or coal bins.

20. 20Unit III: Steam & Gas Power Plants
3.2: FUEL HANDLING SYSTEMS: IN STEAM POWER PLANTS
7. INPLANT HANDLING
The In-Plant coal handling system deals with feeding of coal
from live storage to the furnace.
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It includes various equipment's for transfer of coal like belt
conveyor, screw conveyor etc. & the equipment needed to
weigh the quantity of coal for feed.
In case of pulverized coal firing system, it requires large no.
of equipment’s like chutes, pulverized mills, feeders,
weighing machine, hoppers & automatic scales.

21. 21Unit III: Steam & Gas Power Plants
In this lesson, We have learnedIn this lesson, We have learnedIn this lesson, We have learnedIn this lesson, We have learned
FUEL HANDLING SYSTEMS: CLASSFICATION
FUEL HANDLING SYSTEMS: TYPES OF TRANFER SYSTEMS
SUMMARY
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FUEL HANDLING SYSTEMS: TYPES OF TRANFER SYSTEMS

22. 22Unit III: Steam & Gas Power Plants
Our Next Video Lecture Topic
3.2.9: PULVERIZED FUEL HANDLING SYSTEMS IN POWER PLANTS
3.3 : ELECTRP-STATIC PRECIPITATOR
3.4 : CONTROL SYSTEMS OF POWER PLANTS
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Till Then Stay Connected,
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3.4 : CONTROL SYSTEMS OF POWER PLANTS
3.5 : STEAM POWER PLANT CONTROLS & 3.6 : MAINTENANCE PROCEDURE