What is the efficiency of a nitrogen expander approximately?
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In the natural gas liquefaction process, there is a nitrogen expander with a power output of around 6000 kW. I’m not sure what the efficiency of this expansion process is; could you provide information on the actual operating conditions? For example, what type of medium is used, what the temperature and pressure are, and what the values are after expansion, so that I can do the calculations myself. There is also a high-pressure LNG hydraulic turbine; I’m not sure what its efficiency is. If anyone knows, please let me know. Thank you.
The isentropic efficiency of the turbine expander in air separation units is generally around 80%. The working medium in our expander is nitrogen; the pressure before the expander is 2.3 bar and the temperature is around -146 degrees Celsius, while the pressure after the expander is 0.2 bar and the temperature is around -173 degrees Celsius. Could the poster provide some information about your nitrogen expansion machines? Thank you.
It’s still just a research project at the moment, so the research isn’t very in-depth; and as for my role in the process development, I’m only responsible for calculating the power
I would like to ask, once you know the temperature and pressure, how do you calculate the efficiency? ? ?