利用LNG冷能与Brayton循环及ORC联合发电系统  

Combined Power Generation System Using LNG Cold Energy,Brayton Cycle and ORC

作　　者：梁莹 管延文[1] 蔡磊[1] 刘文斌[1] 向艳蕾 韩逸骁 

机构地区：[1]华中科技大学环境科学与工程学院,湖北武汉430074

出　　处：《煤气与热力》2017年第12期1-7,共7页Gas & Heat

摘　　要：基于"温度对口、梯级利用"原则,将LNG冷能与富氧燃烧技术、燃气轮机发电、氮气Brayton(布雷顿)循环、R245fa有机朗肯循环(ORC)以及碳捕获过程结合,构建一套利用LNG冷能与Brayton循环及ORC联合发电系统,充分利用LNG冷能和烟气余热。介绍系统流程,分析氮气Brayton循环最高压力、R245fa有机朗肯循环最高压力对系统效率的影响。通过对系统流程和参数的综合优化,各循环实现合理匹配,达到系统性能最优。利用Aspen Plus模拟软件对该系统进行模拟计算,得到在优化工况下系统总发电功率为469.8 MW,总发电效率为58.25%,净发电效率为46.91%,系统火用效率为40.39%。与常规的燃气-蒸汽联合循环发电系统相比,总发电效率提高了35.40%,净发电效率提高了11.16%。Based on the principle of ＂tempera-ture counterpart and cascade utilization ＂, combining LNG cold energy with oxy-fuel combustion technology, gas turbine power generation, nitrogen Brayton cycle, R245fa organic Rankine cycle （ORC） and carbon cap- ture, a combined power generation system using LNG cold energy, Brayton cycle and ORC is built to make full use of LNG cold energy and flue gas waste heat. The technological process of the combined system is in- troduced, and the influence of the maximum pressure of nitrogen Brayton cycle and the maximum pressure of R245fa organic Rankine cycle on the system efficiency is analyzed. The optimal system performance is a- chieved by comprehensive optimization of the techno- logical process and parameters of the combined system, and the reasonable match of each cycle. The combined system is simulated by Aspen Plus software. The re- suits show that under optimized conditions, the total generated power is 469. 8 MW, and the total power generation efficiency is 58.25%, the net power generation efficiency is 46.91% and the exergy e^ciency of the combined system is 40.39%. Compared with the conventional gas-steam combined cycle power generation system, the total power generation efficiency of the combined system increases by 35.40%, and the net power generation efficiency increases by 11.16%.

关 键 词：LNG冷能 富氧燃烧 碳捕获 布雷顿循环 有机朗肯循环 燃气轮机发电 

分 类 号：TM611[电气工程—电力系统及自动化]