SEMINAR ON

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SEMINAR ON

• BOILERS

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WHAT IS A BOILER?

• Boiler is an apparatus to produce steam .Thermal
  released by combustion of fuel is transferred to
  water which vaporizes and gets converted into
  steam at a desired pressure and temperature.

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BOILERS IN INDUSTRIES
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BOILERS IN STEAM PLANTS
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FEATURES OF A BOILER

1. SAFETY
2. ACCESSIBILITY
3. CAPACITY
4. EFFICIENCY
5. COST
6. CONSTRUCTION

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TYPES OF BOILERS

• ACCORDING TO
• FLOW OF WATER AND HOT GASES
• POSITION OF FURNACE
• POSITION OF PRINCIPAL AXIS
• APPLICATION
• CIRCULATING WATER
• STEAM PRESSURE

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FLOW OF WATER AND HOT GASES

• 1.WATER TUBE BOILER
• Water circulates through tubes . Hot
  products of combustion flow over these tubes.
• 2.FIRE TUBE BOILER
• Hot combustion gases flow through the tubes .
  Water surrounds the tubes.

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WATER TUBE BOILER
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FIRE TUBE BOILER
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BABCOCK AND WILCOX BOILER

• Its a water tube boiler . It consists of a drum
  , super heater ,headers , tubes etc.

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COCHRAN BOILER

• Its a fire tube boiler . Its a vertical boiler,
  has a lesser space . Flue gases escape to
  atmosphere after passing through smoke box and
  stack.

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COCHRAN BOILER
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POSITION OF FURNACE

• INTERNALLY FIRED
• EXTERNALLY FIRED
• Internally fired boilers the grate combustion
  the grate combustion chamber are enclosed within
  boiler shell.

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POSITION OF PRINCIPAL AXIS

• VERTICAL
• HORIZONTAL
• INCLINED

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APPLICATION

• STATIONARY
• MOBILE(MARINE,LOCOMOTIVE)

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SCOTCH MARINE BOILER

• Its a fire tube boiler . It is of 2 types
• 1.Single ended
• 2.Double ended

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CIRCULATION OF WATER

• Natural circulation
• Forced circulation

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STEAM PRESSURE

• Low pressure
• Medium pressure
• High pressure

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HIGH PRESSURE BOILER

• Boiler pressure is 250 kg per sq . Cm
• And steam temperature is 550 degree centigrade.
  It is a water tube boiler.

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BOILER MOUNTINGS AND ACCESSORIES

• Mountings are the components used for the safety
  of the boiler.
• Ex-feed pump , speed check valve etc.

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FEED PUMP VALVES
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THERMAL EFFICIENCY OF BOILER

• It is defined as the ratio of heat actually
  utilized be water in generation of steam to the
  heat supplied during the combustion of fuel.
• EfficiencyW(H2-H1)/W1CV

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BOILER MAINTENANCE

• Regular maintenance and careful supervision of
  working of various components result in efficient
  operation

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THANK YOU FOR

• PATIENT HEARING