摘要
本文以某电厂660MW汽轮机组为研究对象,通过理论分析与现场试验相结合的方法,研究了低压轴封供汽压力(Ps)对机组背压及热效率的影响。研究发现,Ps过低会导致机组背压异常,造成热效率下降,Ps过高会有大量蒸汽泄露影响机组安全,造成能源浪费。研究结果显示,Ps在0.12MPa~0.16MPa区间时,机组背压稳定于5.0kPa左右的合理区间,机组热效率显著提升;Ps低于0.12MPa时,背压随供汽压力增加而显著降低,当Ps从0.06MPa升至0.12MPa时,背压从6.12kPa降至5.30kPa,热效率提升约0.7%,年减少煤耗约0.76万吨;年减排CO_(2)约2.11万吨。研究结果为大型火电机组的节能降耗提供了量化技术路径,对火电机组的高效运行和低碳发展具有重要的参考价值。
This paper investigates the impact of low-pressure gland seal steam pressure(Ps)on the back pressure and thermal efficiency of a 660 MW steam turbine unit in a power plant through theoretical analysis and field experiments.The study found that excessively low(Ps)leads to abnormal back pressure,reducing thermal efficiency,while excessively high(Ps)causes significant steam leakage,compromising unit safety and energy conservation.The results indicate that when(Ps)is optimized within the range of 0.12~0.16 MPa,the unit back pressure stabilizes around 5.0 kPa,significantly improving thermal efficiency.When(Ps)increases from 0.06 MPa to 0.12 MPa(below the optimal range),the back pressure decreases from 6.12 kPa to 5.30 kPa,enhancing thermal efficiency by approximately 0.7%,with an annual coal consumption reduction of 7,600 tons and CO_(2) emissions reduction of 21,100 tons.This research provides a quantified technical pathway for energy conservation and emission reduction in large-scale thermal power units,offering critical insights for enhancing operational efficiency and advancing low-carbon development in the power industry.
出处
《节能与环保》
2025年第6期49-56,共8页
Energy Conservation & Environment Protection
关键词
汽轮机组
低压轴封供汽
机组背压
节能减排
Steam turbine unit
Low-pressure shaft seal steam supply
Unit back pressure
Energy conservation and emission reduction
