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. The method comprises the steps that 1) an SSS clutch is adopted for engagement between a unit generator and a gas turbine; 2) the unit lubricating oil temperature is set as T, the absolute vacuum degree corresponding to T is P1, the ambient atmospheric pressure is P0, and before the SSS clutch is engaged with a gas turbine shaft, the relative vacuum degree set value of the gas turbine is P2; and 3) the relative vacuum degree set value P2 of the gas turbine is obtained through calculation by means of above two formulas, and the relative vacuum degree of the gas turbine is set at P2. The control method provided by the invention has the beneficial effects that the operating method provided by the invention is simple and feasible, and a bearing bush body or a system do not need to be modified; no equipment modification needs to be performed on a gas turbine unit, no extra input cost is needed, operation is easy, only the vacuum needs to be broken appropriately in the unit starting process, the swell capacity of a #8 bearing mounted in a condenser is increased, thus, vibration in the unit starting process can be effectively reduced, and therefore, the safety and stability of the unit are guaranteed.

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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