摘要
重型燃气轮机电厂部分负荷运行时,由于透平排烟温度控制策略并未充分利用透平叶片的承温能力,因此可以通过优化修正后透平排烟温度(TETC)控制策略,来提升机组部分负荷下的透平排烟温度,实现燃气轮机及联合循环的部分负荷工况效率提升。通过燃气轮机热力、燃气轮机透平、余热锅炉、汽轮机、控制等多方面的分析和评估,确定TETC提升量的安全上限,形成优化的TETC控制策略,并在燃气轮机控制仿真系统中测试TETC提升控制逻辑,保障控制逻辑正常工作。优化的TETC控制策略在可编程逻辑控制器(PLC)中以硬件方式实现,加装在电厂控制系统中,使加装的控制逻辑与原有控制系统相对独立,可实现无扰投退,并直接对燃气轮机TETC控制值进行优化。经过电厂多次燃烧热态调试,确定最终TETC提升量。对余热锅炉和汽轮机也进行了安全运行的评估和性能提升的挖掘,提升部分负荷时余热锅炉耐受的透平排烟温度上限和汽轮机主汽温度的上限,形成多设备联动的性能提升方案。通过部署在电厂侧的燃气轮机全厂在线性能评价系统进行部分负荷性能优化的效果评估。某AE94.2燃气轮机电厂的实施结果显示,最高TETC提升量可达到20℃,NO_(x)排放仍然低于50 mg/m^(3)。全厂在线性能评价系统评估显示,联合循环机组效率的绝对提升量达0.15%~0.26%。研究成果可为同类燃气轮机电厂的性能优化提供参考。
Since the turbine exhaust gas temperature control strategy doesn’t fully utilize the temperature-bearing capacity of the turbine blades when the heavy-duty gas turbine is operating under part-load,the exhaust gas temperature control strategy can be optimized to realize the power plant efficiency improvement at part-load operation.Through analysis and evaluations of gas turbine performance,gas turbine heat transfer,heat recovery boiler,steam turbine,control,etc.,the safe upper limit of Turbine Exhaust Temperature Corrected(TETC)lift is determined,and the optimized TETC control strategy is formed.The optimized TETC control strategy is implemented in the form of Programmable Logic Controller(PLC)as hardware,and installed in the power plant control system to realize the relative independence and disturbance-free switching,so the gas turbine TETC control value is optimized.The final TETC increase is determined after multiple combustion hot state debugging.The safety operation evaluation and performance improvement of heat recovery boiler and steam turbine are also carried out,which can increase the turbine exhaust gas temperature upper limit that the heat recovery boiler can withstand at part-load,and the upper limit of the main steam temperature of the steam turbine,so the performance improvement plan for multi-device linkage is formed.The performance improvement effect evaluation of part-load is carried out through the online performance evaluation system deployed on the power plant side.The implement results of an AE94.2 combined cycle power plant(CCPP)show that the maximum TETC increase can reach 20℃,and NO_(x)emission is still less than 50 mg/m^(3).The online performance evaluation of the whole plant shows that the absolute efficiency increase of CCPP is 0.15%~0.26%.The research results can provide reference for the performance optimization of similar gas turbine power plants.
作者
卫明
曾建军
崔丰
计京津
孙博
WEI Ming;ZENG Jianjun;CUI Feng;JI Jingjin;SUN Bo(Shanghai Electric Gas Turbine Co.,Ltd.,Shanghai 200240,China;Beijing Shangzhuang Gas-Fired Thermal Power Co.,Ltd.,Beijing 100094,China)
出处
《热力透平》
2022年第1期26-30,51,共6页
Thermal Turbine
关键词
燃汽轮机
联合循环
部分负荷
性能优化
修正后透平排烟温度控制
gas turbine
combined cycle
part-load
performance optimization
turbine exhaust temperature corrected control
