压气站燃气轮机烟气余热利用方案

A waste heat utilization scheme for the flue gas of gas turbines in compressor stations

余热利用技术已在石油天然气工业得到广泛应用,根据压气站燃气轮机排出烟气温度高、排量大的特点,分析了压气站几种常用的燃气轮机烟气余热利用技术特点及其存在问题。针对西气东输某压气站燃气轮机实际运行数据,利用分析法对燃气轮机体系进行分析,并设计出烟气轮机利用烟气余热发电的工艺方案,对比了燃气轮机及余热利用系统的联合装置体系与不加余热利用系统的燃气轮机体系的效率。结果表明:利用余热利用系统的联合装置体系效率平均提高17.5%,每年节省燃气约1.03×10~6 m^3,为压气站燃气轮机烟气余热利用提供了参考。

Waste heat utilization technologies have been widely used in oil and gas industry. The flue gas discharged from gas turbines in compressor stations is characterized by high temperature and large displacement. In this paper, characteristics and problems of several flue gas waste heat utilization technologies commonly used for gas turbines in compressor stations were analyzed. Based on the on-site operation data of gas turbines in one compressor station along West-to-East Gas Pipeline, the gas turbine system was analyzed by means of exergy analysis method. Then, the electricity generation scheme of flue gas turbine by using the waste heat of flue gas was designed. Finally, the exergy efficiency of the combined device system of gas turbine and waste heat utilization system was compared with that of gas turbine system without waste heat utilization system. It is indicated that the exergy efficiency of the combined device system with waste heat utilization system is increased by 17.5% on average. By virtue of this combined device system, about 1.03×10^6 m^3 gas is saved each year. The research results provide the reference for the waste heat utilization of flue gas of gas turbines in compressor stations. （1 Figure, 4 Tables, 23 References）