Process Simulation of a 1 Million m3/d Peak-Shaving Type Natural Gas Liquefaction Plant Based on Aspen Hysys
The natural gas processing capacity in this design is 1 million m3/d,and the processing capacity is small,which belongs to the peak-shaving natural gas liquefaction plant.Peak-shaving natural gas liquefaction plants often use small-scale LNG liquefaction processes due to their small processing capacity.There are two main types of processes suitable for small liquefaction units:single-mix refrigerant process and various expansion processes,such as secondary nitrogen expansion liquefaction process,N2-CH4 expansion liquefaction process,open expansion liquefaction process.In this design,Aspen hysys is mainly used to build a static simulation process of secondary nitrogen expansion liquefaction,and the energy consumption and liquefaction rate of the liquefaction process are optimized based on the genetic algorithm in the Matlab toolbox.After 130 iterations,the optimal value of the optimization variables was simulated and calculated.The specific power consumption before process optimization was 0.704 1,the liquefaction rate was 0.951 5,the specific power consumption after optimization was 0.540 3,and the liquefaction rate was 0.951 5.The specific power consumption before and after optimization was reduced by 28.37%.
natural gas liquefactionsecondary nitrogen expansion liquefactionstatic process simulationgenetic algorithm optimization
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