Boiler Types: Water Tube Boiler and Babcock and Wilcox Boiler
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Questions and Answers

What is the main reason for using water tube boilers exclusively?

  • When capacity is less than 7000 kg of steam per hour
  • When used for marine purposes
  • When pressure exceeds 10 bar (correct)
  • When low pressure is required

    • How is the fuel supplied in a Babcock and Wilcox boiler?

  • Through a hand hole
  • Through a chimney
  • Through the water level indicator
  • Through the fire door to the grate (correct)

    • What material are the inclined water tubes typically made of in these boilers?

  • Aluminum
  • Stainless steel
  • Mild steel (correct)
  • Copper

    • What is the approximate angle of inclination of the water tubes to the horizontal?

    <p>20°</p> Signup and view all the answers

    Where does the water from the drum flow after passing through the inclined tubes?

    <p>Back into the drum</p> Signup and view all the answers

    What is used to force the hot gases to move upwards between the tubes in a Babcock and Wilcox boiler?

    <p>Baffle plates</p> Signup and view all the answers

    What type of boiler consists of a cylindrical shell with a dome-shaped top?

    <p>Cochran boiler</p> Signup and view all the answers

    In a simple vertical boiler, what is provided at the ends of each cross tube for cleaning purposes?

    <p>Hand holes</p> Signup and view all the answers

    Which boiler has the advantage that the sediment in the water falls to the bottom without directly contacting the hottest portion of the furnace gases?

    <p>Cornish boiler</p> Signup and view all the answers

    What type of tubes are fitted inclined in a Cochran boiler to ensure efficient circulation of water?

    <p>Cross tubes</p> Signup and view all the answers

    What is the primary material used for constructing the shell of a Lancashire boiler?

    <p>Iron</p> Signup and view all the answers

    Which type of boiler is commonly used in sugar mills and textile industries due to its reliability and simplicity of design?

    <p>Lancashire boiler</p> Signup and view all the answers

    What feature ensures that the combustion gases pass through a number of horizontal tubes surrounded by water in a Cochran boiler?

    <p>Fire brick lining</p> Signup and view all the answers

    In a Cornish boiler, what is used to prevent excessive heating of the plates at the bottom where sediment may collect?

    <p>Brickwork bridge</p> Signup and view all the answers

    Which mountings are commonly found in simple vertical boilers?

    <p>Pressure gauge, Water level gauge, Safety valve, Steam stop valve, Feed check valve, Water level gauge.</p> Signup and view all the answers

    In a Cochran boiler, what is burnt on the grate and collected in the ash pit for disposal?

    <p>Fuel</p> Signup and view all the answers

    What type of boiler is the scotch type marine boiler?

    <p>Fire tube boiler</p> Signup and view all the answers

    Where are the combustion chambers located in a scotch boiler?

    <p>At the back end of the furnace</p> Signup and view all the answers

    For what type of applications are shell boilers considerably cheaper than water tube boilers?

    <p>Low pressure and low output</p> Signup and view all the answers

    What limits the use of natural circulation in modern high pressure boiler plants?

    <p>Density difference limitations</p> Signup and view all the answers

    In high pressure boilers, what does passing water flow through a partial system of tubing help with?

    <p>Reducing pressure drop due to friction</p> Signup and view all the answers

    What is a method used in high pressure boilers to increase heat transfer by evaporation?

    <p>Mixing the superheated steam with the water</p> Signup and view all the answers

    Why are water tube boilers generally preferred for high pressure and high output applications?

    <p>They offer better heat transfer capabilities</p> Signup and view all the answers

    What is the function of Sugden's superheater in a Lancashire boiler?

    <p>To increase the temperature of steam after it exits the boiler</p> Signup and view all the answers

    How are the 'U' tubes in Sugden's superheater arranged inside a Lancashire boiler?

    <p>In groups of four, attached to two steel headers</p> Signup and view all the answers

    What happens to the path of gases in relation to the damper control mechanism during operation?

    <p>It is controlled by the damper and can be adjusted using a hand wheel</p> Signup and view all the answers

    When steam is directed to the main steam pipe without passing through the superheater, what valve is opened?

    <p>V3</p> Signup and view all the answers

    What is the purpose of a steam separator in a boiler system?

    <p>To remove any moisture content from the steam</p> Signup and view all the answers

    How many 'U' tube groups are typically carried by one pair of headers in Sugden's superheater?

    <p>Ten groups</p> Signup and view all the answers

    In a double-acting pump, how is the water discharged?

    <p>In each stroke of the piston</p> Signup and view all the answers

    What is the advantage of a double feed pump over a single feed pump?

    <p>Continuous flow of water</p> Signup and view all the answers

    How is an injector different from a feed pump?

    <p>An injector feeds steam into the boiler</p> Signup and view all the answers

    What is the main function of an economiser?

    <p>Heating feed water using waste heat</p> Signup and view all the answers

    How is an independent type economiser installed?

    <p>Apart from the boiler setting</p> Signup and view all the answers

    What ensures that the excess water from an injector finds its way out?

    <p>Steam pressure of the boiler</p> Signup and view all the answers

    Which part of the injector helps to regulate the flow of water?

    <p>Steam cone S</p> Signup and view all the answers

    What is the purpose of using pumps in high-pressure boilers?

    <p>To maintain forced circulation of water</p> Signup and view all the answers

    How does the use of small diameter tubes in large number contribute to the efficiency of a boiler?

    <p>Utilizes the heat of combustion more efficiently</p> Signup and view all the answers

    What is the main purpose of pressurized combustion in boilers?

    <p>To increase the rate of heat release</p> Signup and view all the answers

    Why does a Lamont boiler use a centrifugal pump?

    <p>To maintain forced circulation</p> Signup and view all the answers

    How does a Loeffler boiler prevent salt deposition on inner surfaces?

    <p>By using superheated steam for evaporating feed water</p> Signup and view all the answers

    What are the Feed Pumps used for in a boiler system?

    <p>To deliver feed water to the boiler</p> Signup and view all the answers

    Which type of pump consists of a pump cylinder and a piston?

    <p>Reciprocating pump</p> Signup and view all the answers

    What is one advantage of using small diameter tubes in large numbers in a boiler?

    <p>Utilizes heat of combustion more efficiently</p> Signup and view all the answers

    What is one disadvantage that can be avoided due to compactness in high-pressure boilers?

    <p>Danger of overheating due to uneven heating</p> Signup and view all the answers

    Why is pressurized combustion used in boilers?

    <p>To increase the rate of firing of fuel</p> Signup and view all the answers

    What is the purpose of the dampers located at the front and back ends of the ash pit in the locomotive boiler?

    <p>To regulate the flow of air to the grate</p> Signup and view all the answers

    What is the function of the fire tubes in the locomotive boiler?

    <p>To pass hot gases from fire box to smoke box</p> Signup and view all the answers

    Where is the steam collected over in the locomotive boiler?

    <p>In the dome-shaped chamber</p> Signup and view all the answers

    What is the main function of the superheater tubes in a locomotive boiler?

    <p>To further heat and superheat steam before leading it to cylinders</p> Signup and view all the answers

    Why can't a locomotive boiler achieve natural draught?

    <p>It has a very high chimney that is not feasible on a locomotive</p> Signup and view all the answers

    What is located at one end of the cylindrical barrel in a locomotive boiler?

    <p>Fire box</p> Signup and view all the answers

    Which component in a locomotive boiler ensures safety by releasing excess pressure?

    <p>Fusible plug</p> Signup and view all the answers

    What causes corrosion and scale formation in the water legs of a locomotive boiler?

    <p>Accumulation of sediments and mud particles.</p> Signup and view all the answers

    In a locomotive boiler, what is discharged through the blast pipe to produce correct draught when exhaust steam is not available?

    <p>Fresh steam from the boiler.</p> Signup and view all the answers

    What is the function of an economiser in a boiler system?

    <p>To heat the feed water using flue gases</p> Signup and view all the answers

    Why is an air preheater used in a boiler system?

    <p>To increase the temperature of air before it enters the furnace</p> Signup and view all the answers

    What is the primary purpose of a superheater in a boiler?

    <p>To decrease the steam consumption of the engine or turbine</p> Signup and view all the answers

    Where are the superheaters usually located in relation to the furnace gases?

    <p>In the path of the furnace gases</p> Signup and view all the answers

    What is a common method used to prevent soot deposit on pipes in an economiser?

    <p>Moving scrapers up and down to keep pipe surfaces clean</p> Signup and view all the answers

    Why is it important for the temperature range between parts of a boiler to be reduced?

    <p>To prevent chilling of the boiler metal</p> Signup and view all the answers

    Which type of air preheater is generally placed after the economiser in a boiler system?

    <p>Tubular type</p> Signup and view all the answers

    What do superheaters help eliminate in a steam plant?

    <p>Condensation in cylinders and steam pipes</p> Signup and view all the answers

    What is the role of a blow-off cock in a boiler system?

    <p>To remove sediments deposited in bottom boxes</p> Signup and view all the answers

    What is an advantage of having a superheater in a boiler system?

    <p>Reduces losses due to condensation in cylinders and steam pipes</p> Signup and view all the answers

    Where is the mud collector located in a boiler?

    <p>At the lowest point of the boiler</p> Signup and view all the answers

    What does the baffle in a steam drum of a Stirling water tube boiler do?

    <p>Moves impurities downwards</p> Signup and view all the answers

    How does a Babcock Wilcox water tube boiler with cross drum differ from a longitudinal drum boiler?

    <p>It allows more connecting tubes</p> Signup and view all the answers

    What happens to combustion products in a fire tube boiler?

    <p>They are discharged through the chimney</p> Signup and view all the answers

    Where is the steam taken from in a Babcock Wilcox water tube boiler?

    <p>Drum 1</p> Signup and view all the answers

    What supports the steam drums and mud drum in a water tube boiler?

    <p>Steel beams independent of brickwork</p> Signup and view all the answers

    How do fire brick arches contribute to combustion in a boiler?

    <p>Help in combustion and prevent chilling of the furnace</p> Signup and view all the answers

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