Heat supply protection control method and device for cogeneration unit

Abstract

The invention provides a heat supply protection control method and device for a combined heat and power generation unit. The heat supply protection control method comprises the steps that first logic interlocking control is conducted on a heat supply high-side system, and second logic interlocking control is conducted on a newly-added heat supply low-side system. The device executes the method. According to the heat supply protection control method and device of the combined heat and power generation unit, it can be guaranteed that relevant steam turbine body and high and low bypass heat supply parameters are located in a safe operation space in the bypass heat supply state, the safety and reliability of the unit in the bypass heat supply state are improved, and the continuous response speed of the unit to heat and power load changes is increased; and the deep peak regulation capacity of the unit can be improved.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a heating protection control method and device for a cogeneration unit. Background technique [0002] Bypass heating technology is an important thermal and electrolytic coupling method. This method requires less unit transformation and lower investment, and can greatly improve the deep peak shaving capability of cogeneration units. [0003] During deep peak regulation, the cogeneration unit will frequently switch between extraction and condensation and bypass heating, and in the bypass heating state, the inlet steam parameters of the high and low side are higher than that of the normal start and stop of the steam turbine, which worsens the difference between the high and low side. The working environment of the valve, at the same time, due to the parallel inlet of the steam turbine with the high and low sides and the frequent changes of the steam inlet parameters, the a...

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Problems solved by technology

[0003] The cogeneration unit will frequently switch between condensate extraction and bypass heating during deep peak regulation, and the high and low bypass steam parameters in the bypass heating state are higher than those when the steam turbine is normally started and stopped, which deteriorates the high and low bypass conditions. The working environment of the valve, and because the high-low bypass is connected with the steam turbine in parallel and the steam intake parameters change frequently, resulting in frequent changes in the axial thrust of the steam turbine and the pressure ratio of the high and medium pressure cylinders. Control and limit. In extreme cases, the axial thrust of the unit, the temperature of the thrust tile and the pressure ratio of the high and medium pressure cylinders exceed the limit, and the thrust tile will be worn out and burned, and the final blade of the high and medium pressure rotor will be damaged, which will affect the heat supply of the unit under deep peak regulation. Stability and Security

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