A Siemens 9f gas turbine combined cycle unit constant exhaust cylinder temperature clutch engagement control method

Abstract

The invention relates to a Siemens 9F gas turbine combined cycle unit constant exhaust cylinder temperature clutch engagement control method, comprising the steps of: 1) using SSS clutch engagement between the unit generator and the steam turbine; 2) setting the unit lubricating oil temperature as T, T corresponds to The absolute vacuum degree of the steam turbine is P1, the ambient atmospheric pressure is P0, and before the SSS clutch engages with the steam turbine shaft, the set value of the relative vacuum degree of the steam turbine is P2; Set the relative vacuum to P2. The beneficial effects of the present invention are: the operation method of the present invention is simple and easy to implement, and does not need to make changes to the bearing pad body or the system. There is no need for equipment modification of the gas turbine unit, no additional investment costs, and simple operation. It only needs to properly break the vacuum during the start-up of the unit and increase the expansion of the #8 bearing installed in the condenser to effectively reduce the vibration during the start-up of the unit. So as to ensure the safety and stability of the unit.

Description

technical field [0001] The present invention relates to a meshing control method, more specifically, it relates to a Siemens 9F gas turbine combined cycle unit constant exhaust cylinder temperature clutch meshing control method. Background technique [0002] Gas-steam combined cycle (CCPP) unit is favored because of its advantages of high efficiency, environmental protection and flexibility. Most domestic CCPP units are positioned as peak-shaving units, with frequent start and stop. Siemens is currently one of the main suppliers of gas turbines. Its 9F-class gas-steam combined cycle units are composed of F-type gas turbines, HE-type triple-pressure reheat double-cylinder steam turbines, generators, waste heat boilers, etc., of which gas turbines, generators, steam The turbines are coaxially arranged. [0003] The shaft system of Siemens 9F gas combined cycle unit is arranged on a single shaft. It is composed of a gas turbine, a generator, a steam turbine high-pressure roto...

AI Technical Summary

Problems solved by technology

Due to structural design, installation, operating conditions and other reasons, the supporting stiffness of the No. 8 bearing is low, which may easily cause unstable vibration of the bearing bush

The SSS clutch is used between the generator and the steam turbine of the unit to engage. This type of unit generally has the problem of excessive vibration during start-up and rotation, especially during the clutch engagement process, which seriously affects the safety and stability of the unit.

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