Basically what is Locomotive boiler?


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in this power point presentation... a brief overview of the locomotive boiler and major application of this boiler has given....
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  • A traction engine is a self-propelled steam engine used to move heavy loads on roads, plough ground or to provide power at a chosen location. A steamroller (or steam roller) is a form of road roller – a type of heavy construction machinery used for leveling surfaces. A Portable engine is an engine that sits in one place while operating but is portable, you can move it from one place to another.
  • In this boiler, natural draught cannot be obtained because it requires a very high chimney which cannot be provided on a locomotive boiler since it has to run on rails. Thus some artificial arrangement has to be used to produce a correct draught. As such the draught here is produced by exhaust steam from the cylinder which is discharged through the blast pipe to the chimney.
  • Boiler efficiency measures how much combustion energy is converted into steam energy, while steam quality measures how much liquid water is present in the steam produced.
  • Internal or external pressure acting on flat plates tends to distort the metal to spherical form; hence a flat plate is not self-supporting, as it cannot be made sufficiently thick to prevent undue deformation. It is advantageous to use light boiler plate and stay it to withstand safely the given pressure.
  • It has something labelled as a radiator at the front, when one would have thought that any spare heat would have been used for heating water. Possibly it was supposed to be a lubricating oil-cooler. The Kitson-Still was tested on some of the more severe routes in Britain.
  • Basically what is Locomotive boiler?

    2. 2. What is a Boiler basically and a general difference between a steam generator and boiler? What is Locomotive Boiler? Principle of Steam Locomotives. Construction & Working of a Locomotive Boiler. Specification of Locomotive boiler (Made at Chitranjan Works India). Advantages, Features & Disadvantages of Locomotive Boiler. Major application & statistics of locomotive used locomotive boiler ( 26 Nov. 2013 2
    3. 3.  Boiler or steam generator is a device used to create steam by applying heat energy to water.  Boilers has its own specifications like steam rated, & rated pressure.  Generally, boilers use external fuel, whereas steam generator might act as a exchanger of heat.  Although the definitions are somewhat flexible, it can be said that older steam generators were commonly termed boilers worked at low to medium pressure (1300 psi/0.069-20.684 bar; 6.895-2068.427 kpa) but, at pressures above this, it is more usual to speak of a steam generators. 26 Nov. 2013 3
    4. 4.  Locomotive boiler is the horizontal fire tube boiler in which hot gases pass through the tubes and water surrounds them. Transferred heat from the gases to water and then converted into steam. It may also be used as a stationary boiler.  A locomotive boiler is the central part of the engine for any steam-powered locomotive train. It is also defined as a steel shell containing water which is converted into steam, by the heat of the fire in the firebox, to energy to move the locomotive. Its main requirement is it should produce steam at a very high rate. Therefore, this boiler requires a large amount of heating surface and large grate area to burn coal at a rapid rate. . In order to provide the large heating surface area, a large number of fire tubes are setup and heat transfer rate is increased by creating strong draught by means of steam jet.  Locomotive-type boilers are used in traction engines, steam rollers, & portable engines. 26 Nov. 2013 4
    5. 5. 5  Steam locomotives operate by converting heat energy into mechanical energy.  This requires a heat source, a locomotive boiler to generate steam and cylinders converting the thermal energy contained in steam to mechanical energy, which can be used to perform work. 26 Nov. 2013
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    7. 7. 26 Nov. 2013 7  The locomotive boiler consists of a cylindrical barrel with a rectangular fire box at one end and a smoke box at the other end.  The fire box is entirely surrounded by water except for the fire hole and the ash pit which is situated below the fire box which is fitted with dampers at its front and back ends. Dampers control the flow of air to grate.  The generated hot gases pass from the fire box to the smoke box through a series of fire tubes and then they are discharged into the atmosphere through the chimney. Fire tubes are placed inside the barrel.  Some of the tubes are of larger diameter and some of the tubes are of smaller diameter. The superheater tubes are placed inside the fire tubes of larger diameter.  A dome shaped chamber known as steam dome is fitted on the upper part of the barrel, from where the steam flows through a steam pipe into the chamber. A regulator is also fitted here to regulate the flow of steam.  Superheated steam chamber is fitted to the right of the chimney, which collects the superheated steam.  Exhaust steam is discharged through the blast pipe to the chimney from the cylinders.
    8. 8.  The coal is introduced through the fire hole into the grate which is placed at the bottom of the fire box.  The hot gases which are generated are deflected by an arch of fire bricks to heat the walls of fire box properly.  The heat of the hot gases is transmitted into the water through the heating surfaces of the fire tubes. The steam generated is collected over the water surface.  The steam flow through a steam pipe from the steam dome into the chamber. The flow of steam is regulated by means of a regulator.  From the chamber steam passes through the superheater tubes and returns to the superheated steam chamber from which it is led to the cylinders through pipes, one to each cylinder. 26 Nov. 2013 8
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    10. 10.            Dimensions and Specifications of the locomotive boiler made at Chitranjan Works in India are given below: Barrel Diameter --------------- 2.095m Length of the barrel ---------- 5.206m Size of the tubes (superheater) – 14cm No. of superheater tubes ----- 38 Size of ordinary tubes ---------- 5.72cm No. of ordinary tubes ----------- 116 Steam Capacity ------------------- 9000 kg/h Working Pressure ---------------- 14 bar Grate Area ------------------------- 4.27 m2 Heating Surface ------------------- 271 m2 Efficiency --------------------------- 70% 26 Nov. 2013 10
    11. 11.  Large rate of steam generation per square metre of heating surface.  Low cost of construction.  Portability.  Low installation cost because It is free from brickwork, special foundation and chimney.  It is very compact. Pressure of steam is limited to 20 bar. 26 Nov. 2013 11
    12. 12.  The evaporative capacity of this boilers is high compared with other boilers (20,000 to 40,000kg/hr). The operating pressure lies between 11.5 to 17.5 bar.  The draught loss is minimum compared with other boilers.  The defective tubes can be replaced easily.  The entire boiler rests over an iron structure, independent of brick work, so that the boiler may expand or contract freely.  The brick walls which form the surroundings of the boiler are only to enclose the furnace and the hot gases. 26 Nov. 2013 12
    13. 13.  There is more chances of corrosion and scale formation in the water legs due to the accumulation of sediments and the mud particles.  Large flat surfaces need bracing.  It cannot carry high overloads without being damaged by overheating.  There are practical constructional limits for pressure and capacity which do not meet requirements. 26 Nov. 2013 13
    14. 14.  Mostly locomotive boiler is used to move the locomotive trains. It may also be used as a stationary boiler. One of the example of its uses is given below: 26 Nov. 2013 14
    15. 15.  The Kitson-Still Locomotive was an attempt to combine the fuel economy of the diesel engine with the high starting torque of the steam locomotive, in order to remove the need for a gearbox for the Diesel part.  Steam from the oil-fired boiler was used in overload conditions, for running the locomotive auxiliaries, and for train heating.  The actual engine was a horizontally opposed 8-cylinder design; the 4 inner cylinders (nearer the crankshaft) were steam-powered, while the 4 outside cylinders (furthest from the crankshaft) were Diesel.  There were many problems ; out of which poor boiler performance is the only one when the test began in April 1928. The loco did its last test runs in 1933. 26 Nov. 2013 15
    16. 16.  The working pressure of this locomotive was 200 psi, but apparently this would drop to 135psi on starting; and it is an awfully big loss of pressure. The locomotive would change from steam to diesel operation at an engine speed of about 30rpm. 26 Nov. 2013 16
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    18. 18. FOR YOUR ATTENTION AND FOR PATIENTLY LISTENING ….............. 26 Nov. 2013 18