LNG动力船燃料冷能综合利用研究

为实现LNG动力船燃料冷能的利用，以设计中超大型油船（VLCC）为代表船型，对其进行理论计算和对比，验证LNG燃料冷能在船舶上梯级利用的可行性.设计一套LNG冷能综合利用的具体方案，满足海水淡化、船舶空调和船舶冷库的需求，并结合船舶主柴油机烟气余热进行低温冷能发电.利用软件Aspen HYSYS进行模拟计算，以系统总？效率为主要目标函数，对比分析不同冷媒条件下各主要参数对系统性能的影响，最终确立一套最优方案.模拟结果表明，朗肯循环发电冷媒采用R170，降低关键节点NG-3温度，降低冷凝压力，提高蒸发压力，可显著提高系统的性能.
In order to reuse the fuel cold energy, the feasibility of LNG cold energy cascade utilization was verified through the theoretical calculation and comparison on behalf of the ship type for very large crude carrier (VLCC). In addition, a concrete scheme for LNG cold energy comprehensive utilization was designed to meet the energy needs of seawater desalination, marine air-conditioning and marine refrigerator, as well as the power generation by using cold energy with the carrier’s main diesel engine flue gas heat. To get an optimal case, the influence of crucial point parameters on system performance using different refrigerant was compared and analyzed taking the energy efficiency as main objective function by using the software Aspen HYSYS simulate computation. Simulation results show that the system performance is improved markedly by using R170 as Rankine cycle refrigerant, such as decreasing temperature of crucial point NG-3, decreasing condensation pressure and raising the evaporating pressure.