Statistical Entropy Analysis and Experimental Study of LNG Plant with Precooling at –70°C

Abstract

Statistical entropy analysis method is used to study an LNG plant operating on high-pressure cycle with precooling at –70°C. The degree of thermodynamic perfection and the plant-units-wise energy consumption distribution are determined by calculation and confirmed by experiment. It is shown that the plant can be perfected further by introducing a cascade precooling cycle into the plant circuit, whereupon the degree of thermodynamic perfection increases by 4.7% and the specific energy consumption decreases by 5%.