Mixed refrigerant cascade cycles for LNG
摘要
Examples of the analysis of the thermodynamic irreversibilities of several mixed refrigerant cycles were presented. Accurate vapor-liquid equilibrium and thermodynamic calculations for mixtures are required for the successful process design of mixed refrigerant cycles having cooling curves with close temperature approaches, which the analysis of thermodynamic irreversibility shows is necessary to obtain optimum cycle efficiency. The lower first cost of the erected plant, which results from the ability to utilize fewer, larger pieces of equipment makes this approach to LNG production advantageous. Another advantage is that the refrigerant consists of components normally found in natural gas plus nitrogen from the atmosphere that results in a plant selfsufficient with regard to refrigerants. (MCW)