Harm of fluctuation of steam turbine control valve
Steam turbine is a commonly used power generation equipment. In the process of power generation, regulating the speed and power of steam turbine plays a key role in ensuring the stable operation of power grid. However, in the process of steam turbine power generation, the fluctuation of control valve may lead to the unstable operation of power generation equipment, and then affect the stability of the whole power grid.
1. Causes of steam turbine governing valve fluctuation
The main reason for the fluctuation of turbine regulating valve is the instability of oil supply system, which leads to the fluctuation of turbine inlet flow, pressure and temperature. In addition, the imbalance of turbine rotor and bearing damage may also lead to valve fluctuation.
2. The influence of turbine regulating valve fluctuation on equipment and power grid.
2. Influence of1on steam turbine
The fluctuation of steam turbine control valve will lead to the violent fluctuation of internal pressure, temperature, speed and other parameters of steam turbine. Under the action of inertia force, this change will lead to drastic changes in the force on the turbine, which will increase the stress borne by the turbine, easily lead to fatigue damage and failure, and then lead to equipment accidents.
In addition, the fluctuation of the speed regulating valve of the steam turbine will also lead to the flutter of the steam turbine, which will cause the strong vibration of the rotor, aggravate the vibration of the unit and make the fan noise loud, thus aggravating the instability of the unit operation.
2.2 Impact on the power grid
Steam turbine is an important part of power grid, which is mainly responsible for power supply and stability. When the governor of hydraulic turbine fluctuates, it will not only affect the operation of hydraulic turbine itself, but also adversely affect the stability of power grid. For example, the fluctuation of steam turbine control valve will cause the change of outlet frequency, which will lead to the instability of power generation and affect the stability of power grid.
3. How to avoid the fluctuation of steam turbine regulating valve?
In order to reduce the influence of the fluctuation of steam turbine control valve on equipment and power grid, the following measures can be taken:
3. 1 increases the stability of fuel supply. By changing the fuel supply parameters of steam turbine such as oil supply, gas supply and water supply, the fuel fluctuation is reduced and the input pressure, temperature and flow rate of steam turbine are kept stable.
3.2 Check the balance state of the turbine rotor. By checking the mass balance of rotating parts of steam turbine, the fluctuation of regulating valve caused by mechanical imbalance can be reduced.
3.3 Install the tone control system. By installing the tone control system, the opening, closing, adjustment and control of the air valve can be automatically controlled, thus reducing the severity of tone fluctuation.
conclusion
The fluctuation of steam turbine governing valve is a dangerous phenomenon, which will affect the stability of power generation equipment and power grid. In order to reduce the influence of regulating valve fluctuation on equipment and power grid, corresponding measures must be taken to ensure the normal operation of generator equipment and minimize its influence on power grid stability.