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Control method for preventing trip accident caused by steam turbine steam-flow excited vibration

A technology of steam flow excitation and control method, applied in the directions of machines/engines, mechanical equipment, engine components, etc., can solve the problems of unpredictability, threats to the safety and economic operation of the unit, large vibration and tripping, and avoid tripping. Accidents, suppression of airflow excitation, and effects of reducing boiler load

Active Publication Date: 2015-06-24
ZHEJIANG ZHENENG ZHONGMEI ZHOUSHAN COAL & ELECTRICITY CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

Steam flow excitation belongs to sudden vibration, which is unpredictable and causes large-value low-frequency vibration. When steam flow excitation fault occurs during operation, especially in the case of high load and high steam parameters, instantaneous (several seconds) ) will exceed the vibration protection limit of the steam turbine, which will directly lead to a large vibration accident and seriously threaten the safe and economical operation of the unit

Method used

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  • Control method for preventing trip accident caused by steam turbine steam-flow excited vibration

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] Please refer to the attached picture, the unit #1 of a certain power plant uses Dongqi’s first self-innovated impulse condensing steam turbine N1030-24.36 / 600 / 600. The shaft system of the unit is composed of high-pressure rotor, medium-pressure rotor, A low-pressure rotor, B low-voltage rotor, and generator rotor. Each rotor is supported by two bearings, which are numbered from 1 to 10 from the turbine end to the motor end. Each rotor is rigidly connected to the wheels, the thrust bearing is between the No. 2 and No. 3 bearings, and the working surface is on the generator side. Among them, No. 1, 2, 3, and 4 bearings are tilting pad bearings, each with six tilting pads, No. 5, 6, 7, and 8 bearings are cylinder-type elliptical bearings, and No. 9 and 10 bearings are end-cap-type elliptical bearings. bearings.

[0018] The unit vibration...

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Abstract

The invention discloses a control method for preventing a trip accident caused by steam turbine steam-flow excited vibration. Through the monitoring of the shaft vibration of each bearing of a steam turbine and an electric generator, when the amplitude value of any shaft vibration in an X direction and a Y direction of each bearing of a high-pressure rotor and a high-medium-pressure rotor of the steam turbine exceeds a definite value, a flow instruction of a unit is triggered to be directly down regulated, a control valve of the unit is downward closed to a certain amplitude, the load of a boiler is reduced, and therefore, the steam-flow excited vibration is suppressed timely. The control method for preventing the trip accident caused by the steam turbine steam-flow excited vibration designs two classes of protection definite values of the steam-flow excited vibration, downward closed amplitudes of the flow instruction and recovery time of the flow instruction, the steam-flow excited vibration can be suppressed effectively, and the trip accident is avoided occurring.

Description

technical field [0001] The invention relates to the technical field of vibration fault diagnosis and treatment of large steam turbines, and more precisely relates to a control method for preventing tripping accidents caused by steam flow excitation of steam turbines. Background technique [0002] The use of ultra-supercritical pressure is one of the important ways to improve the thermal efficiency of steam turbines. With the structural adjustment of my country's electric power industry, the development, production and development of ultra-supercritical pressure units is an inevitable trend for thermal power generation to save energy, improve the environment, increase power generation efficiency, and reduce power generation costs. However, the increase of the steam parameters of the steam turbine will lead to an increase in the density of the steam entering the high-pressure cylinder and an increase in the flow rate, and the sensitivity of the tangential force of the steam ac...

Claims

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Application Information

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IPC IPC(8): F01D21/14
Inventor 虞国平应光耀童小忠朱继峰
Owner ZHEJIANG ZHENENG ZHONGMEI ZHOUSHAN COAL & ELECTRICITY CO LTD
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