汽轮机低压缸微出力改造技术研究与应用OA

To address the practical demands for improving heating capacity and energy saving and consumption reduction of a 320 MW wet-cooling combined heat and power unit,while also solv-ing the problems of limited operating range,high flutter risk,and blade water erosion hidden danger existing in the zero-output modification of the low-pressure cylinder,the unit#4 of a power plant was taken as the research object.The technical principle,system design scheme,commissioning and verification process,and operation adjustment strategy of the low-pressure cylinder micro-output modification are systematically described.Through the modification of the vacuum system,optimization of the butterfly valve control logic and related parameter matching,stable operation of the unit under ultra-low back pressure conditions within a wide load range was achieved.The com-missioning results show that after the modification,the maximum heating extraction steam flow of the unit can reach 620 t/h,the minimum electric load is reduced to 80 MW,and all operating pa-rameters meet the safety requirements.This modification technology effectively overcomes the inher-ent defects of zero-output modification and provides a technical reference for similar units to achieve energy saving,efficiency improvement,and flexible heating.