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How Double Stage Reciprocating Air Compressor Works?
By Prasanna Sutrave
In my previous post,you came to know how single stage reciprocating air compressor works.The working principle of air compressor is same in all types of reciprocating air compressor.The difference is in stages of compression,construction,cooling media etc. This post will give you clear idea of working principle of Double Stage Reciprocating Air Compressaor. Double stage reciprocating air compressor consist of two cylinders.One is called LOW PRESSURE CYLINDER and another is called HIGH PRESSURE CYLINDER.When piston in low pressure cylinder is at it's outer dead centre (ODC) the weight of air is zero (neglecting clearance volume), as piston moves towards inner dead centre (IDC) pressure falls below atmospheric pressure & suction valves opens due to pressure difference.The fresh air is drawn inside the low pressure cylinder through air cleaner.This air is further compressed by piston and pressure inside & outside the cylinder is equal, at this point suction valves closed.As piston moves towards ODC compression of air took
place and when the pressure of air is in range of 1.5 kg/centimeter square TO 2.5 kg/centimeter square delivery valves opens & this compressed air is then entered into High pressure Cylinder through INTER COOLER.This called as Low Pressure Compression.If suction & discharge stroke took place on both side of piston then it is called Double Acting Low Pressure Compression. When air pressure in high pressure cylinder is below to the receiver pressure,suction valves of high pressure cylinder opens & low compressed air from Low Pressure Cylinder drawn into High Pressure Cylinder.As piston moves towards the ODC, this air is further compressed.When air pressure from low pressure cylinder and inside the high pressure cylinder is equal,suction valves closed.Now air is further compressed by piston untill the pressure in the High Pressure Cylinder exceeds that in the receiver & discharge valves opens. This desired high pressure air is then delivered to receiver.Same procedure is repeated in every cycle of operation. If suction & discharge stroke took place on both side of piston then it is called Double Acting High Pressure Compression.In Double Stage Reciprocating Air Compressor AIR PRESSURE can be developed in range of 5.5kg/centimeter square TO 35 kg/centimeter square. Normally where we required AIR PRESSURE above 7.0 kg/centimeter square & delivery of air above 100 cubic feet/min. this DOUBLE STAGE RECIPROCATING AIR COMPRESSOR is used.This is most common model used in various plants.
If we required air pressure above 35 kg/centimeter square, this double stage reciprocating air compressor is
not useful. For more,please visit
http://www.pnengineering.blogspot.com/
This intel first appeared on: http://pnengineering.blogspot.com
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This intel was contributed by prasanna
prasanna
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May, 2012
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