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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. ...

NESTLER BOILER

NESTLER BOILER:- It is a fire tube boiler Producing steam at a pressure of 12 bar and a temp of about 240° C.
The rate of steam generation for this boiler is 550kg/hr.
CONSTRUCTION:- IT consists of following components
• Boiler sheel
• Fire tubes
• Centrifugal pump 
• stroke box 
• Burner
• Flue pump
The boiler consists of 12mm thick mild steel plat end is welded with one at each end.A large number of fire tubes of 50 mm diameter each are fitted the two end plate in addition to 0.5 m diameter furnace tube which extends from front end plate to real end plate.

WORKING:- the burner is provided at the mid of the frunece. At each end of boiler shell, there is a smoke box. In the rear end of smoke box, a deflector arch is provided to divert the flow of flue gas . The Heat is generated by flue gas with high pressure air in burner. The heated air is supplied in fire tubes which is inside the water. This heat ,  heated the tubes and water.
After this process water is converted into steam and this steam is collected in steam space.

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