某330 MW汽轮机组冲、反动结合高效通流部分改造技术分析

Technical Analysis on the Transformation of Impulse and Reaction Combined with High-efficiency Flow Passage of a 330 MW Steam Turbine Unit

针对某厂330 MW机组缸效低、煤耗高的问题,文章对汽轮机进行冲、反动式结合高效汽轮机通流部分改造技术进行分析,以达到节能降耗的目的。通过对汽轮机高中低压部分进行改造,高、中部分缸采用冲动式设计,低压部分采用反动式设计;将汽轮机高压模块由改造前11级动叶更换为12级动叶,中压模块动叶共计12级未增减,低压部分由原来2×5级优化为2×6级,通过级数的增加提高了汽轮机综合效率,也解决了原汽轮机运行中轴振高、1号轴承偏磨、顶轴油系统管路振动大等重大缺陷。

Aiming at the problems of low cylinder efficiency and high coal consumption of a 330 MW unit in a certain plant,the article analyzes the steam turbine's impulse and reaction type combined with the high-efficiency steam turbine flow-through part transformation technology to achieve the purpose of energy saving and consumption reduction.Through the transformation of the high,medium and low pressure parts of the steam turbine,the high and middle cylinders adopt an impulse design,and the low pressure part adopts a reaction design;The 12th stage has not been increased or decreased,and the low-pressure part has been optimized from the original 2×5 stage to 2×6 stage.Through the increase of the number of stages,the overall efficiency of the steam turbine has been improved,and the shaft vibration height,the eccentric wear of the No.1 bearing,and the top of the original steam turbine during operation have been solved.Major defects such as large vibration of the shaft oil system pipeline.