Criteria S.I. Engine (Petrol or Spark Ignition Engine) C.I. Engine (Diesel or Compression Ignition Engine) Working Cycle Works on Otto Cycle or Constant Volume Cycle. Works on Diesel Cycle. Mixture During Suction Stroke Takes a mixture of air and petrol during the suction stroke. Takes only air during the suction stroke. Fuel Used Uses petrol as fuel. Uses diesel as fuel. Compression Ratio Has a compression ratio that varies from 6 to 10. Has a compression ratio that varies from 16 to 20. Engine Weight and Cost S.I. engines are lighter and cheaper. C.I. engines are heavier and costlier. Initial Cost Initial cost is lower compared to C.I. engines. Initial cost is high due to high compression ratio. Starting Starting is easy. Starting is difficult, especially in cold conditions. ...
LANCASHIRE BOILER - It is non portable fire tube type horizontal boiler. It consists of cylinder shells with two tubes A and B called Fire Tubes which are symmetrical in dimension.
Each Fire Tubes Contain a furnace in front of it, there is a Grate over which fuel is burn.
CONSTRUCTION - it is a stationary fire tube internally fired horizontal boiler. These boiler have a cylinder shell of 2m in diameter and it's length varies from 7.5m to 10m . It has two large internal fire tubes having diameter 80cm to 100 cm in which grate is situated.
WORKING - The fuel is burn in a fire great and on burning the fuel combustion Process take place
The fuel gas enter the main tube by the fire deflector.
As the flue gas moves in tubes they heat up the tubes and water which is surrounded the tubes is also heated. After this process water is converted into steam. The steam is taken out from steam supply valve.
Application - it is used in sugar mills and chemical industry.
ADVANTAGES
• It is simple in construction.
• It is easy to operate.
• it can meet sudden demand of steam.
DISADVANTAGES
• It is not for High pressure.
• Steam generation is slow.
• Efficiency is less.
• It is not suitable for portable works.