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Expansion Engine


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Expansion EngineAn expansion engine is an essential equipment used in gas plants. It is a well-known fact that gases can be cooled by expansion from high pressure to low pressure and this is accomplished by using an expansion engine. A vertical, single acting type of engine, an expansion engine produces the cold required for the gas plant.

Working of an Expansion Engine
At the start of downward stroke of the piston, high-pressure air enters through inlet valve. On further moving the piston down, the inlet valve closes and entrapped air expands. During upward stroke, inlet valve remains closed while the outlet valve remains open. Therefore, in downward stroke air enters the cylinder. This in turn leads to the expansion of the air. In the upward stroke the expanded air is pushed outside. An electric motor is required to start the machine. After that the engine is moved by the air pressure itself and during this process, the motor retains the speed by acting as a brake. Since work is done by air in moving the flywheel, it loses its heat content and thus the air gets cooled.

Components of an Expansion Engine
The expansion engine consists of three major units: Types of Expansion Engines A typical expansion engine used in oxygen gas plants.

Expansion Engine

Features of an Expansion Engine
Though different manufacturers may come up with different features to improve the efficiency of expansion engine, some of the common properties are: Buying Tips
Characteristic values for expansion engine to be considered are as follows:

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