Steam bypass control method for gas turbine combined cycle generator set

Abstract

The invention discloses a steam bypass control method for a gas turbine combined cycle generator set. The steam bypass control method for the gas turbine combined cycle generator set comprises the following steps: before ignition of a turbine: setting the pressure value of a high-pressure bypass as the sum of the current pressure value of a high-pressure main steam pipe and a starting value; setting the pressure value of a medium-pressure bypass as the sum of a reheat pressure value and the starting value; setting the pressure value of a low-pressure bypass as a rated value; after ignition of the turbine: setting the pressure increments and pressure target values of the high, medium and low-pressure bypasses respectively according to openings; after a high-pressure cylinder steam inlet command is sent, closing the high-pressure bypass to a quarter at the speed of percentage per second, setting the pressure value of the high-pressure bypass as the sum of the current pressure value of the high-pressure main steam pipe and the closing value of the high-pressure bypass; after a low-pressure cylinder steam inlet command is sent, setting the pressure value of the low-pressure bypass as the sum of the pressure value of a low-pressure steam main pipe and the smaller one of the closing value of the high-pressure bypass and / or the rated value; after the high-pressure and medium-pressure bypasses are opened, starting respective bypass cooling water electric valves; opening a low-pressure bypass cooling water electric valve and a low-pressure overheater outlet electric valve at the same time.

Description

technical field [0001] The invention relates to the field of electric power engineering, in particular to a method for steam bypass control of a gas turbine combined cycle generator set. Background technique [0002] Due to the need for peak regulation, the start and stop operations of the gas generator set are relatively frequent, resulting in a large amount of operation of the steam bypass pressure and temperature regulating valve. The bypass pressure regulating valve includes three bypass pressure regulating valves of high, medium and low pressure. At present, the control method of the bypass pressure when the thermal power plant is started is that the operator manually changes the opening of the bypass pressure regulating valve. This method relies too much on the operator's experience, and the operation volume is large and there is a risk of misoperation. If the action speed is improper, it will have a great impact on the water level of the steam drum and the temperatur...

AI Technical Summary

Problems solved by technology

If the action speed is improper, it will have a great impact on the water level of the steam drum and the temperature after the bypass

[0003] For the above problems, there is no good solution in the prior art

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