深度调峰火电机组汽动给水系统及配汽系统优化

Optimization on Steam Turbine-driven Feedwater System and Steam Distribution System for Thermal Power Units with Deep Peak Regulation

分析了火电机组汽轮机各系统在深度调峰工况下对经济性的主要影响因素,重点研究了汽动给水系统及配汽系统的运行经济性,使用EBSILON建模平台计算并分析了使用不同汽动给水泵汽源时机组运行经济性的差异,定量计算了不同主蒸汽压力下的机组运行经济性指标,分析了连通管蝶阀参与调节对经济性的影响。结果表明:四段抽汽作为汽源的经济性优于冷再热蒸汽;使用连通管蝶阀对给水泵汽轮机进汽进行调压时,汽轮机热耗率将升高123.7~146.5 kJ/(kW·h);深度调峰时适当降低主蒸汽压力有助于提升机组运行经济性。

For a thermal power unit,analyses were conducted on the main influence factors of each system in steam turbine on the economy under deep peak regulation condition,and researches were emphatically carried out for the operation economy of steam turbine-driven feedwater system and steam distribution system.The differences of unit operation economies with different steam sources for steam turbine-driven feedwater pump were calculated and analyzed based on EBSILON modelling platform,the operation economy indexes of the unit under different main steam pressure conditions were quantitatively calculated,and the influence of the adjustment of the butterfly valve in interconnecting pipe on the economy was analyzed.Results show that,the economy of the fourth stage steam as the steam source is better than that of cold reheated steam,and the steam turbine heat rate would be increased by 123.7146.5 kJ/(kW·h)when adjusting the steam admission of steam turbine-driven feedwater pump with the butterfly valve in interconnecting pipe.The unit operation economy can be improved by the appropriate decrease of main steam pressure under deep peak regulation condition.