Liquefied Natural Gas (LNG) is one of the most promising fuels with high calorific value and low specific GHG emissions that offers several advantages as an energy carrier for power generation. In this paper, a novel polygeneration concept based on LNG fired plant for power, cooling and drinking water production in island systems is presented. Two Solid Oxide Fuel Cell based energy systems (one simple SOFC and another hybrid concept of SOFC combined with GT) are modelled in Aspen Plus and compared with two conventional combustion based technologies (internal combustion engine and Gas Turbine Combined Cycle) in terms of overall efficiency. Furthermore, a Low Temperature Multi-Effect Distillation (LT-MED) plant was modelled and coupled with the energy systems to evaluate the waste heat recovery potential for desalinated water production. Moreover, three concepts for cold recovery from the LNG regasification plant were presented and modelled. Process simulations results revealed that the hybrid SOFC-GT plant is the best solution in terms of energy efficiency and the heat recovery of the exhaust gas in a LT-MED unit is a promising option for drinking water production with almost no energy cost. Last, from exergetic point of view, the cryogenic energy storage (CES) via the production of liquid air was evaluated as the best option for waste cold utilization during LNG regasification.

液化天然气（LNG）是最有前途的燃料之一，具有高热值和低特定的GHG排放量，作为发电的能源载体具有许多优势。在本文中，提出了一种新的基于LNG的发电厂的多联产概念，用于岛屿系统中的电力，冷却和饮用水生产。在Aspen Plus中对两个基于固体氧化物燃料电池的能源系统（一种简单的SOFC和另一种SOFC与GT相结合的混合概念）进行了建模，并将其与两种常规的基于燃烧的技术（内燃机和燃气轮机联合循环）进行了比较。此外，对低温多效蒸馏（LT-MED）厂进行了建模，并将其与能源系统结合使用，以评估淡化水生产中的余热回收潜力。此外，提出并建模了LNG再气化厂冷回收的三个概念。过程仿真结果表明，就能源效率而言，混合式SOFC-GT装置是最佳解决方案，而LT-MED装置中废气的热量回收是生产饮用水的有希望的选择，而几乎没有能源成本。最后，从积极的角度出发，通过液化空气生产的低温能量存储（CES）被评估为液化天然气再气化过程中废冷利用的最佳选择。过程仿真结果表明，就能源效率而言，混合式SOFC-GT装置是最佳的解决方案，而LT-MED装置中废气的热回收是生产饮用水的有希望的选择，而几乎没有能源成本。最后，从积极的角度出发，通过液化空气生产的低温能量存储（CES）被评估为液化天然气再气化过程中废冷利用的最佳选择。过程仿真结果表明，就能源效率而言，混合式SOFC-GT装置是最佳解决方案，而LT-MED装置中废气的热量回收是生产饮用水的有希望的选择，而几乎没有能源成本。最后，从积极的角度出发，通过液化空气生产的低温能量存储（CES）被评估为液化天然气再气化过程中废冷利用的最佳选择。