Effect of gas composition on the charging temperature of compressors
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Reciprocating compressor, three-stage compression. Currently, the secondary outlet temperature is on the rise year by year, with no significant decline in the heat exchange efficiency of the inter-stage coolers. The designed gas components are as follows: Whether a change in the gas components will have an impact on the exhaust temperature. What are the effects of a decrease in average molecular weight?
It is suggested that compressors come in various configurations, and analyzing such issues requires information on the type and mechanical structure of the compressor. For example, whether the cylinder is equipped with a water-cooled jacket or something like that. For reference.
The compression ratio between different molecular weight levels changes, resulting in an increase in the temperature of the gas valve
We can analyze the gas composition first. Due to changes in ambient temperature, our factory used to insulate the inlet pipes in order to reduce the inlet temperature; there are various aspects from which this can be analyzed.
My understanding is that since the gas is lighter, with the same amount of power applied, more gas can be compressed; as a result, the outlet temperature will rise. I’m not sure if this is correct
The hydrogen content increases sharply, and this affects the properties of the gas by changing the isentropic exponent; this in turn has a major impact on the outlet temperature
With constant back pressure, as the gas composition becomes lighter, the outlet temperature will decrease
There are way too many people talking nonsense. The gas composition affects the polytropic index of the gas; with the pressure ratio per stage of the compressor remaining constant, changes in the gas constant influence the exit temperature of the gas. Let’s take an example: a compressor that was originally used to handle CH4, whose polytropic index is 1.3, now has H2 mixed in with the CH4; the adiabatic index of H2 is 1.4. As a result, the exhaust temperature rises.
It would be more straightforward if the formulas could be listed