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A Displacement Sensor for Monitoring Rotor Deformation of Power Plant Air Preheater

A technology of air preheater rotor and displacement sensor, applied in the field of displacement sensor, can solve problems such as easy damage, inability to realize gap measurement, etc., and achieve the effects of small appearance, improved detection accuracy and service life, and reliable operation.

Active Publication Date: 2017-12-08
EASTERN BOILER CONTROL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a displacement sensor for monitoring the deformation of the rotor of an air preheater in a power station, so as to solve the problem that the existing air preheater built-in gap sensor cannot realize the gap measurement in the whole process; Damaged, unable to replace faulty parts and maintenance work online

Method used

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  • A Displacement Sensor for Monitoring Rotor Deformation of Power Plant Air Preheater
  • A Displacement Sensor for Monitoring Rotor Deformation of Power Plant Air Preheater
  • A Displacement Sensor for Monitoring Rotor Deformation of Power Plant Air Preheater

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Embodiment 1

[0016] like Figures 1 to 3 As shown in the figure, a displacement sensor for monitoring the deformation of the air preheater rotor in a power station includes an optical fiber sensor 1, a laser ranging sensor 2 arranged outside the air preheater, and an optical fiber coupler arranged between the laser ranging sensor 2 and the optical fiber sensor 1 3. The end of the optical fiber sensor 1 connected to the optical fiber coupler 3 is provided with a transmitting optical fiber 11 and a reflecting optical fiber 12 . The optical fiber sensor 1 passes through the outer wall of the air preheater and enters the interior of the air preheater, aligns with the air preheater rotor to detect the angle steel 6, and realizes the displacement detection of the air preheater rotor 7 due to thermal deformation. The optical fiber sensor 1 is used for the emission and reception of laser light, and plays the role of conducting laser light. The laser light emitted by the laser ranging sensor 2 ente...

Embodiment 2

[0018] A displacement sensor for monitoring the deformation of the rotor of an air preheater in a power station. An optical fiber sensor locking device 4 is provided inside the air preheater. The optical fiber sensor locking device 4 includes a locking support 41 and an arc wedge 42. One end of the optical fiber sensor 1 located in the air preheater is provided with a T-shaped installation part 13 , the T-shaped installation part 13 is inserted into the installation hole of the locking support 41 , and its end is pressed against the end surface of the locking support 41 .

[0019] The optical fiber sensor locking device 4 also includes a traction rope 43 that pulls the arc wedge 42 to rotate, and the traction rope 43 passes through the end of the cooling wind blowing device 5 and extends out of the air preheater; A wedge surface 410 matching with the arc-shaped wedge 42 is provided, and a tightening seam 411 is provided on the locking support 41 passing through the center of th...

Embodiment 3

[0022] A displacement sensor for monitoring the deformation of the rotor of an air preheater in a power station, the air preheater is also provided with a cooling air blowing device 5, and the optical fiber sensor 1 and the optical fiber sensor locking device 4 are placed in the cooling air blowing device 5 . The cooling air purging device 5 is a stainless steel bellows, and an air inlet 51 is provided at one end outside the air preheater. The cooling purge air penetrates into the air preheater through the stainless steel bellows. On the one hand, it can cool down the optical fiber sensor, and on the other hand, it can ensure that the optical path through which the laser beam reaches the air preheater rotor to detect the angle steel is a clean space. Others are the same as embodiment 1.

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Abstract

The invention discloses a displacement sensor for monitoring the rotor deformation of an air preheater in a power station, comprising an optical fiber sensor, a phase-type laser ranging sensor (hereinafter referred to as a laser ranging sensor), and an optical fiber coupler; the optical fiber sensor is connected with the optical fiber coupler. One end is provided with a transmitting optical fiber and a reflecting optical fiber. The optical fiber sensor enters the interior of the air preheater through the outer wall of the air preheater, and is aligned with the air preheater rotor to detect the angle steel, so as to realize the displacement detection of the air preheater rotor due to thermal deformation. The laser ranging sensor conducts the emitted and received laser light through the optical fiber sensor, and the measurement results obtained by the detection are sent to the air preheater gap sealing control system for use. The invention has a simple structure, can monitor the deformation of the air preheater rotor in the full range, and has the advantages of simple structure, high temperature resistance, long service life, convenient maintenance and the like, and can be widely used in displacement sensors for monitoring the deformation of the air preheater rotor in power stations. field.

Description

technical field [0001] The invention relates to a displacement sensor, in particular to a displacement sensor for monitoring the deformation of the rotor of an air preheater in a power station. Background technique [0002] The rotary air preheater in a large-scale thermal power plant is an extremely important auxiliary equipment in a power plant boiler. The rotor will deform after being heated. The sealing gap is controlled by controlling the sector plate lifting device through the control system to lift up and down the sector plate at the hot end of the air preheater. Motion to track thermal deformation of the rotor to achieve optimum hot end radial seal clearance. Therefore, the deformation detection of the rotor after heating is extremely important in the entire gap sealing control system, which is the basis of the air leakage control of the air preheater. The eddy current type or probe contact type rotor gap sensors are all installed inside the air preheater, it is dif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16G01B11/02
Inventor 虞东朱存平马晓刚唐福彬
Owner EASTERN BOILER CONTROL CO LTD