Brief introduction of power regulation mode of lar

2022-08-08
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Briefly describe the power regulation mode of large unit

1, the boiler based operation mode

in this mode, the boiler adjusts the unit load by changing the combustion rate, while the steam turbine controls the main steam pressure by changing the opening of the governing valve. When the load requirements change, the boiler's automatic control system will change the boiler's combustion rate and other regulating quantities according to the load instructions. After the steam pressure changes, the automatic control system of the steam turbine will change the opening of the governing valve to maintain the steam pressure in front of the steam turbine as the set value, and change the output power of the steam turbine generator at the same time. The operation characteristics of steam turbine follow-up control mode are: when the load requirements change, the dynamic deviation of steam pressure is small and the response of purchasing and replacing new drivers is slow

2. Steam turbine based operation mode

in this mode, the boiler adjusts the main steam pressure by changing the combustion rate, while the steam turbine adjusts the unit load by changing the opening of the governing valve. When the load requirements change, the automatic control system of the steam turbine changes the opening of the governing valve according to the load command to change the output power of the steam turbine generator. At this time, the steam pressure in front of the turbine changes, so the automatic control system of the boiler follows the action to change the combustion rate of the boiler and other adjustments (such as water supply, water spray, etc.) to maintain the steam pressure in front of the turbine as the set value. The operation characteristics of this control mode are: when the load requirements change, the power response is fast and the dynamic deviation of steam pressure in front of the turbine is large

3. Power control mode

this mode is a coordinated control mode based on steam turbine. The turbine and boiler as a whole jointly control the load and main steam pressure of the unit, which is also called the overall control mode of turbine and boiler. When the load requirements change, according to the deviation between the load command and the actual output power of the unit, as well as the deviation between the steam pressure in front of the main throttle valve of the turbine and its set value, Make the automatic control system of boiler and steam turbine coordinated and practical, but many foam granulator enterprises do not pay attention to environmental protection issues in their production experience. When changing the speed regulating valve opening of steam turbine, the power supply should be installed with air switch and leakage protection device and the combustion rate of boiler (and can be divided into type a machine, type B machine, type C machine and type D machine from the perspective of experimental machine), so that the dynamic deviation of steam pressure in front of steam turbine is small and the power response is fast. Recently, large thermal power generating units that participate in electric frequency modulation mostly adopt this control mode

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