Automatic control method for HP heater stopping in high load condition

Abstract

Disclosed is an automatic control method for HP heater stopping in high load condition. The method comprises the following steps that the load intensity of the target unit operation is determined as the high load, the automatic control of the high-load HP heater stopping is started to monitor whether the HP heater stopping occurs in real time, if the HP heater stopping occurs, the protection action of the HP heater stopping is determined, and an automatic control strategy is triggered until a reset condition is reached; and if the HP heater stopping does not occur, continue operating is conducted. By means of the method, the situations such as boiler over pressure and water-cooled wall over temperature after the high-load HP heater stopping is avoided by coordinating a control mode, fuel quantity, and water supply through an automatic control unit, the operating burden of an operating worker is reduced, the automatic control capability of the unit is improved, and the blank of the lackof automatic control of a thermal power plant after the HP heater stopping under the high load is filled.

Description

technical field [0001] The invention relates to the technical field of automatic optimization control and safety, and more specifically, relates to an automatic control method for high loading and unloading under high load conditions. Background technique [0002] When the thermal power unit is running at a low load, after the high load system is disconnected, since the steam turbine has no risk of overload, the operator can perform necessary manual intervention to ensure the normal operation of the unit. Due to the reduction of feed water temperature, the economy of unit operation is sacrificed, but there is no risk of boiler overpressure shutdown. [0003] When the unit is running at full load or above 90% high load, after the high-load system is disconnected, since the high-load extraction steam of the unit is completely converted into steam turbine work, the load of the unit will rise rapidly, which may exceed the maximum load that the unit can carry. Boiler overpressur...

AI Technical Summary

Problems solved by technology

[0003] When the unit is running at full load or above 90% high load, after the high-load system is disconnected, since the high-load extraction steam of the unit is completely converted into steam turbine work, the load of the unit will rise rapidly, which may exceed the maximum load that the unit can carry. Boiler overpressure will lead to the risk of boiler safety valve action; feedwater temperature reduction will also cause large changes in main steam temperature and reheat steam

However, the control logic of the existing thermal power units does not have automatic correlation logic for high-load decoupling. High-load decoupling under high-load conditions will test the operator's response and operation level and operating experience, and there are risks such as boiler overpressure and water-cooled wall overheating.

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