Novel overhauling method of determining Siemens 9F gas turbine combined cycle steam turbine shafting centering based on environment temperature

Abstract

The invention relates to a novel overhauling method of determining Siemens 9F gas turbine combined cycle steam turbine shafting centering based on the environment temperature. The novel overhauling method of determining Siemens 9F gas turbine combined cycle steam turbine shafting centering based on the environment temperature comprises the steps that firstly, a first bearing, a second bearing, a third bearing, a fourth bearing, a fifth bearing, a sixth bearing and a seventh bearing of a Siemens 9F gas turbine set are installed on a concrete table surface, the heights from first bearing, the second bearing, the third bearing, the fourth bearing, the fifth bearing, the sixth bearing and the seventh bearing to the table surface are marked as L1, an eighth bearing is supported on the ground through supporting rods, and the height from the eighth bearing to the ground is marked as L2; secondly, the environment temperature is set to be t0, the lubricating oil temperature is set to be t1, the exhaust steam temperature of a steam condenser is set to be t2, the bearing expansion coefficient is set to be epsilon, the height by which the eight bearing needs to be heightened is set to be y, and it can be concluded that y=(t1-t0)*epsilon*L1-(t2-t0)*epsilon*L2; and thirdly, the eighth bearing is heightened according to the height by which the eighth bearing needs to be heightened and acquired through calculation. The novel overhauling method of determining Siemens 9F gas turbine combined cycle steam turbine shafting centering based on the environment temperature has the beneficial effects that the centering problem in the overhauling process caused by difference of the working temperature with each bearing of the Siemens 9F gas turbine set is solved; the problem that gas turbine set vibration is strong caused by poor concentricity of the gas turbine set is solved; and the overhauling method is simple and easy to apply, and no modification needs to be made on the gas turbine set system or a bearing bush body.

Description

technical field [0001] The invention relates to a maintenance method, and more specifically relates to a new maintenance method for determining the alignment of the shafting of a Siemens 9F gas turbine combined cycle steam turbine according to the ambient temperature. 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 gener...

AI Technical Summary

Problems solved by technology

Due to reasons such as structural design, manufacturing, installation, and operating conditions, the supporting stiffness of the No. 8 bearing is low, which is likely to cause unstable vibration of the bearing pad

In addition, during the normal operation of #1~#8 bearings, their respective operating environment temperatures are different. Various factors make it difficult to locate the shafting of the Siemens 9F gas unit during maintenance, and vibration problems frequently occur during operation.

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