Real-time on-line monitoring apparatus of blade vibration of flue gas turbine

Abstract

The invention relates to a real-time on-line monitoring apparatus of blade vibration of a flue gas turbine. The monitoring apparatus comprises blade tip timing sensors, an angle reference sensor, a rotating speed synchronization sensor, a preprocessing system, a data integrated processing card, and a computer. The blade tip timing sensors, the angle reference sensor, and the rotating speed synchronization sensor are connected with the preprocessing system that is connected with the data integrated processing card; and the data integrated processing card is connected with the computer. According to the invention, the sensors employ double-shielded capacitance impulsers; single-core double-shielded wires are utilized as transmission lines of output signals; and a driving cable technology is utilized to effectively reduce a random error introduced by an environmental interference; and a charge amplification circuit is used to extract a capacitance pulse signal, thereby eliminating the system error basically and improving the measurement accuracy of the system.

Description

technical field [0001] The invention relates to the technical field of precision instrument design, in particular to a real-time on-line monitoring device for flue gas turbine blade vibration. Background technique [0002] The flue gas turbine (hereinafter referred to as the smoke machine) is the main energy recovery equipment of the heavy oil catalytic device. It is mainly used to recover the high temperature and high pressure regeneration flue gas of the catalytic cracking unit. The high-temperature regenerated flue gas enters the smoke machine at high speed, and expands through the blade step-down to convert the heat and pressure energy of the flue gas into the mechanical energy of the rotor. Together with the motor, it drives the main fan to run and the generator to generate electricity, so as to achieve the goal of recovering energy from the waste flue gas. Purpose. [0003] As the main working element, the blades are under very harsh working conditions. They operate ...

AI Technical Summary

Problems solved by technology

[0003] As the main working element, the blades are under very harsh working conditions. They operate at high temperatures (550-700°C) for a long time, and due to the impact of erosion or deposition of catalyst particles contained in the flue gas, blade breakage and coating peeling are prone to occur. Accidents, resulting in dynamic unbalance and increased shaft vibration of the hood

This not only has a great impact on the performance of the whole machine, but also threatens the safe operation of the unit

[0004] At present, domestic research on the vibration monitoring of cigarette machine blades is mainly realized by monitoring the vibration of the rotor. Due to the lack of direct information on blade vibration, its reliability, accuracy and stability are greatly restricted.

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