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In this paper, based on the idea of reducing heat exchanger exergy  destruction and increasing turbine work, a new three-stage cascade Rankine  system and a new four-stage cascade Rankine system is proposed to improve  the cold energy utilization rate during liquefied natural gas(LNG)  gasification on liquefied natural gas-floating storage and regasification  unit. Then compare them with the original cascade Rankine cycle established  under the same conditions. The results show that under the condition of 175  t/h LNG flow, the maximum net output power of the new three-stage cascade  Rankine cycle system is 4593.31 kW, the exergy efficiency is 20.644%. The  maximum net output power of the new four-stage cascade Rankine cycle system  is 5013.93 kW, and the exergy efficiency is 22.509%. Compared with the  original cascade Rankine cycle system, the maximum net output power of the  new three-stage cascade Rankine cycle system and the new four-stage cascade  Rankine cycle system is increased by 9.41% and 11.45%, respectively, and the  system exergy efficiency is increased by 9.29% and 11.28%, respectively.

Simulation and optimization of liquefied natural gas cold energy power generation system on floating storage and regasification unit