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DIFFERENCE BETWEEN S.I AND C.I ENGINES

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. ...

BABCOCK AND WILCOX BOILER

BABCOCK AND WILCOX BOILER:- This is very popular boiler. It is water tube boiler and it is designed for stationary purposes. 
CONSTRUCTION:- It consist of following components
1.) Boiler Drum - It is cylindrical drum made up of steel plates in which water is collected and at upper portion is steam space in which steam is collected.

2.) Water Tubes - A large Number of Tubes are attached both the headers water come down to down take headers and moves up to uptake headers. These tubes are inclined at angles of 5 to 15 degree.
3.) Furnace - It is provided just below the upper header. Coal is placed on the Grate to produce heat.  This heat is placed surrounded by the water Tubes.

4.) Baffles - It is act as deflector of the gases and are placed with water Tubes.

5.) Super heater - It is also provided the path of the flue gas to heat the wet steam. To convert it into dry steam.

WORKING:-    First step water is filled in BOILER DRUM . Their is two  headers attached the drum one for  intake and other for down take. The down take water header take the water in water Tubes where is water is heated. The heat produce in fire Grate by using the water Tubes and water and water is converted into steam . But this steam is Contain water vapour which which is called wet steam. To convert it into Dry steam, super heater is used.

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