SEMINAR ON BOILERS WHAT IS A BOILER Boiler

SEMINAR ON BOILERS

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.

BOILERS IN INDUSTRIES

BOILERS IN STEAM PLANTS

FEATURES OF A BOILER 1. 2. 3. 4. 5. 6. SAFETY ACCESSIBILITY CAPACITY EFFICIENCY COST CONSTRUCTION

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

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.

WATER TUBE BOILER

FIRE TUBE BOILER

BABCOCK AND WILCOX BOILER n It’s a water tube boiler. It consists of a drum , super heater , headers , tubes etc.

COCHRAN BOILER n It’s a fire tube boiler. Its a vertical boiler, has a lesser space. Flue gases escape to atmosphere after passing through smoke box and stack.

COCHRAN BOILER

POSITION OF FURNACE INTERNALLY FIRED n EXTERNALLY FIRED Internally fired boilers the grate combustion chamber are enclosed within boiler shell. n

POSITION OF PRINCIPAL AXIS VERTICAL n HORIZONTAL n INCLINED n

APPLICATION STATIONARY n MOBILE(MARINE, LOCOMOTIVE) n

SCOTCH MARINE BOILER It’s a fire tube boiler. It is of 2 types: 1. Single ended 2. Double ended

CIRCULATION OF WATER Natural circulation n Forced circulation n

STEAM PRESSURE Low pressure n Medium pressure n High pressure n

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

BOILER MOUNTINGS AND ACCESSORIES Mountings are the components used for the safety of the boiler. Ex-feed pump , speed check valve etc.

FEED PUMP VALVES

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. Efficiency=W(H 2 -H 1)/W 1*CV

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

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