Thursday, 21 November 2013

Water Tube Boiler


Water Tube Boiler
 
In water tube boiler, boiler feed water flows through the tubes and enters the boiler drum. The circulated water is heated by the combustion gases and converted into steam at the vapour space in the drum. These boilers are selected when the steam demand as well as steam pressure requirements are high as in the case of process cum power boiler / power boilers.
Most modern water boiler tube designs are within the capacity range 4,500 – 120,000 kg/hour of steam, at very high pressures. Many water tube boilers nowadays are of “packaged” construction if oil and /or gas are to be used as fuel. Solid fuel fired water tube designs are available but packaged designs are less common.
The features of water tube boilers are:
  • Forced, induced and balanced draft provisions help to improve combustion efficiency.
  • Less tolerance for water quality calls for water treatment plant.
  • Higher thermal efficiency levels are possible


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