摘要
在IGCC电站中,空气分离系统(空分系统)的能耗最高。如果能降低空分系统的能耗,将显著提高IGCC电站的供电效率。该文依托某IGCC示范电站,对IGCC电站独立空分系统空气压缩单元的2种驱动方式进行了分析比较,认为相比于电动机驱动方式,小型汽轮机驱动空气压缩单元的方式不仅有利于电站的启动,而且能使电站的供电效率提高0.47%,在低负荷工况下运行,提高的幅度会更加显著。为进一步提升电站经济效益,通过改造IGCC电站的余热锅炉,增加补燃装置,使其可以在空分系统启动时为小型汽轮机提供启动蒸汽,从而大大降低电站的初期投资。
ABSTRACT:The energy consumption of the air separation unit (ASU) in the integrated gasification combined cycle (IGCC) plant dominates the overall auxiliary power usage. Reducing the energy consumption of the ASU will greatly reduce the power consumption rate of the IGCC plant thus dramatically increasing the IGCC efficiency. Using a commercialized IGCC demonstration power plant as an example, a comprehensively comparative analysis was conducted for an isolated air separation unit. The results show that using a small steam turbine as the driving force for the air compressor unit of ASU has clear advantage over electric motor, since it is not only convenient for start-up but also more efficient in power generation. It may increase the power output efficiency by 0.47%. When operated at a lower load, the efficiency increase will be even higher. If the technology of supplementary fired heat recovery boiler is used in the heat recovery steam generator (HRSG) to provide the necessary steam for the ASU steam turbine during start-up, the initial investment will be reduced.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第S1期105-111,共7页
Proceedings of the CSEE
基金
中国华能集团公司科学技术项目(CERI/TX-13-HJK01)
北京市科技计划项目(Z131100002413012)~~
关键词
整体煤气化联合循环发电系统
独立空分系统
汽轮机驱动
补燃型余热锅炉
integrated gasification combined cycle(IGCC)
isolated air separation unit
steam turbine drive
supplementary fired heat recovery boiler
