利用液化天然气冷能发电新流程及模拟分析

New Process and Simulation Analysis of Cold Energy Generation Using LNG

对比分析了三种常用的LNG冷能发电方法,并针对目前国内LNG接收站运行情况,提出一种新的LNG冷能发电技术。该技术根据LNG气化压力不同使用混合冷媒,提高过程发电效率。物性方法选择RK-Soave方程,通过ASPENPLUS软件模拟冷能发电系统流程,使用简单[火用]分析法计算了LNG冷能发电流程效率。结果表明,在7MPa气化压力条件下,每吨LNG冷能可发电41.84kWh,系统发电炯效率为40%。同时依据冷媒对冷量回收影响较大的特点,系统可配备一套冷媒在线调配补给系统,保证变工况运行时的效率。

This paper compared and analyzed three common LNG cold energy power generation methods, and proposed a new LNG based on the current domestic LNG receiving station operation. According to the different gasification pressure of LNG, this technology USES mixed refrigerant to improve the process power generation efficiency Cheng simulated the flow of cold energy power generation system with ASPEN PLUS software, and calculated the efficiency of LNG cold energy power generation process with analysis method. Under the condition of 7MPa gasification pressure, the cold energy of each ton of LNG can generate 41.84Kwh and the system's generation efficiency is 40%. The system can be equipped with a set of online refrigerant resupply system to ensure the efficiency under different operating conditions.