2. Fire Tube and Water Tube Boilers

							Fire Tube and Water Tube
         Boilers
      ANIL KUMAR S
  ASSISTANT PROFESSOR
          SNIST
            Fire Tube Boilers

•   Simple Vertical
•   Cochran
•   Cornish
•   Lancashire
•   Locomotive
        Water Tube Boilers

• Babcock and Wilcox

• Bension boiler

• Lamont boiler
                     Cochran Boiler
• Working Pressure        20 bar

• Steam Capacity          3000kg/hr

• Efficiency              70 to 75%

• Tubes diameter          6cm

• Free from overheating

• Light, Compact and occupy less space

• Cost of construction is low

• Easy to install and transport
                Lancashire Boiler
• Two internal flues

• Slow initial generation of steam

• Reliable and bear overload

• Economical within their operating capacity

• Working pressure      16 - 17 bar

• Steam Capacity        2000 – 5000kg/hr
Lancashire Boiler
                         Locomotive Boiler
•   High evaporating capacity

•   Capable of meeting fluctuating loads

•   Portability

•   Compact

•   Low installation cost

•   Possible leakage at joints

•   Sediments cause corrosion and scale formation

•   Difficult to clean

•   Large flat surfaces need bracing

•   Cannot carry high overloads due to overheating

•   Constructional limits for pressure and capacity
Locomotive Boiler
       Babcock and Wilcox Boiler
• Generate Steam at high pressure and rate is high (40 bar and 40000kg/hr)

• For given output it occupies less space

• Parts are accessible for cleaning, inspection and repair

• Parts of coiler can be separated and transported easily

• Fuel is completely burnt due to large heating surface

• Pure feed water required

• Cost is high

• Not portable
Babcock Wilcox Boiler
Steam power plant layout
Cooling tower