Interlocking control method for boiler drum water level of gas-steam combined cycle unit

Abstract

The embodiment of the invention provides an interlocking control method for the boiler drum water level of a gas-steam combined cycle unit, and the method comprises the steps: generating an interlocking protection signal when the medium-pressure drum water level of a waste heat boiler gives an alarm; a medium-pressure superheater outlet electric door corresponding to the waste heat boiler is closed in an interlocking mode, and meanwhile a medium-pressure superheater outlet discharge door and a medium-pressure superheater outlet drainage electric door corresponding to the waste heat boiler are opened in an interlocking mode; feedback signals of the three closing limiting switching value signal measuring points are obtained, and two-out-of-three operation is carried out on the obtained three feedback signals to obtain an electric door closing limiting feedback signal; carrying out non-operation on the electric door closing limiting feedback signal and then carrying out delay processing to obtain an electric door closing limiting correct feedback signal; and according to the correct feedback signal of the electric door closing limit, whether the electric door closing limit of the outlet electric door of the medium-pressure superheater returns to normal or not is judged. Disturbance of a steam-water system can be reduced, waste of working media is reduced, and the operation amount of watchmen is reduced.

Description

technical field [0001] The invention relates to the technical field of waste heat boilers, in particular to an interlocking control method for the water level of a boiler drum of a gas-steam combined cycle unit. Background technique [0002] In a gas-steam combined cycle two-drive-one heating unit, the overall configuration is generally 2 gas turbines, 2 gas turbine generators, 2 waste heat boilers, 1 heating steam turbine and 1 steam turbine generator. The steam generated by the waste heat boiler enters the steam turbine to do work, and the water level of the waste heat boiler is controlled within a certain range through adjustment. In order to prevent the water impact of the steam inlet water, the water level of the steam drum is equipped with a high water level interlock. Steam turbine inlet electric door. Among them, when the water level of the medium pressure drum is high, the interlocking closes the high and medium pressure steam valves of the steam turbine. After the...

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Problems solved by technology

At the same time, when the parameters such as the water level of the waste heat boiler are adjusted and stabilized, it is necessary to re-combining the steam turbine. The overall operation is very heavy, which greatly increases the workload of the on-duty staff.

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