针对某1 000 MW机组在汽轮机调门节能优化后,1年时间内共发生了40余起原因不明、振荡幅度10~30MW、振荡周期4~27 s、持续时间从数秒到数十分钟的功率低频振荡的情况,通过剖析机组协调控制系统(coordinated control system,CCS)逻辑回路...针对某1 000 MW机组在汽轮机调门节能优化后,1年时间内共发生了40余起原因不明、振荡幅度10~30MW、振荡周期4~27 s、持续时间从数秒到数十分钟的功率低频振荡的情况,通过剖析机组协调控制系统(coordinated control system,CCS)逻辑回路和进行建模仿真,确认功率振荡的原因是CCS功率信号宏滤波模块参数设置不当、CCS功率控制器比例控制参数过大、以及机组分散控制系统(distributed control system,DCS)逻辑组态运算顺序不正确等,而诱发因素是汽轮机调门节能优化后阀门流量特性斜率增大。通过完善CCS宏滤波算法模块参数、修正功率控制器参数以及调整DCS逻辑组态运算顺序等措施解决了该问题。展开更多
The structure,function and recognition method of an axis orbit auto-recognizing system are presented in this paper.In order to make the best use of information of format and dynamic characteristics of marine steam tur...The structure,function and recognition method of an axis orbit auto-recognizing system are presented in this paper.In order to make the best use of information of format and dynamic characteristics of marine steam turbine axis orbit,the structure and functions or neural network are applied to this system,which can be used to auto-recognize axis orbit of the system turbine rotor using BP neural network.展开更多
The purpose of this paper is to improve the aerodynamic performances of the last stage turbine and the exhaust hood of a 600MW steam turbine under design and off design conditions. During operation, strong flow intera...The purpose of this paper is to improve the aerodynamic performances of the last stage turbine and the exhaust hood of a 600MW steam turbine under design and off design conditions. During operation, strong flow interactions between the turbine and the exhaust hood impose influences on the flow behavior in the hood and lead to the unsatisfactory aerodynamic performance of the turbine and exhaust hood. So the exhaust hood has the potential to be improved in terms of aerodynamic efficiency. Considering the flow interactions between the turbine and the exhaust hood, the profiles of the diffuser end-wall were optimized. The coupled model turbine and model exhaust hood calculations and experiments were carried out to validate the effects of the optimization. Model experiments show that the design modifications resulted in a substantial increase in the overall pressure recovery coefficient. The flow and aerodynamic performances of the full-scale last stage turbine and full-scale exhaust hood were simulated to explore the flow physics alterations to the modification of diffuser geometry. The wet steam was selected as the flow medium. The actual flow fields trader different operation conditions were analyzed.展开更多
文摘针对某1 000 MW机组在汽轮机调门节能优化后,1年时间内共发生了40余起原因不明、振荡幅度10~30MW、振荡周期4~27 s、持续时间从数秒到数十分钟的功率低频振荡的情况,通过剖析机组协调控制系统(coordinated control system,CCS)逻辑回路和进行建模仿真,确认功率振荡的原因是CCS功率信号宏滤波模块参数设置不当、CCS功率控制器比例控制参数过大、以及机组分散控制系统(distributed control system,DCS)逻辑组态运算顺序不正确等,而诱发因素是汽轮机调门节能优化后阀门流量特性斜率增大。通过完善CCS宏滤波算法模块参数、修正功率控制器参数以及调整DCS逻辑组态运算顺序等措施解决了该问题。
文摘The structure,function and recognition method of an axis orbit auto-recognizing system are presented in this paper.In order to make the best use of information of format and dynamic characteristics of marine steam turbine axis orbit,the structure and functions or neural network are applied to this system,which can be used to auto-recognize axis orbit of the system turbine rotor using BP neural network.
基金financially supported by the National Natural Science Foundation of China(Grant No.51336007)
文摘The purpose of this paper is to improve the aerodynamic performances of the last stage turbine and the exhaust hood of a 600MW steam turbine under design and off design conditions. During operation, strong flow interactions between the turbine and the exhaust hood impose influences on the flow behavior in the hood and lead to the unsatisfactory aerodynamic performance of the turbine and exhaust hood. So the exhaust hood has the potential to be improved in terms of aerodynamic efficiency. Considering the flow interactions between the turbine and the exhaust hood, the profiles of the diffuser end-wall were optimized. The coupled model turbine and model exhaust hood calculations and experiments were carried out to validate the effects of the optimization. Model experiments show that the design modifications resulted in a substantial increase in the overall pressure recovery coefficient. The flow and aerodynamic performances of the full-scale last stage turbine and full-scale exhaust hood were simulated to explore the flow physics alterations to the modification of diffuser geometry. The wet steam was selected as the flow medium. The actual flow fields trader different operation conditions were analyzed.
