Principle of energy savings in mixed refrigerant cooling
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What is the principle behind energy savings in refrigeration using mixed refrigerants (methane, ethylene, propane, isopentane, nitrogen)? How can the ratios of various coolants be adjusted reasonably in practical use to save energy? LNG Process Discussion Group
The principle of energy conservation is not entirely clear; my understanding is that throttling and heat exchange are used to cool the natural gas, thereby enabling its liquefaction. In terms of evaluation, having fewer light components certainly results in better energy efficiency, as it reduces the load on the compressor. However, this is not the only factor to consider; factors such as the temperature of the cold box, the load on the feed gas, and the load on the refrigerant compressor also need to be taken into account. It is necessary to determine through experience the optimal ratio as well as the point at which the load is at its lowest.