Measurement apparatus and method for monitoring clearance generated by air preheater by using double laser

A measurement device, laser measurement technology, applied in the direction of measurement devices, optical devices, instruments, etc., can solve the problem of reducing the cooling requirements of laser measurement equipment, difficult to eliminate high temperature interference and influence, etc., to achieve simple structure and increased working life , the effect of high measurement accuracy

Active Publication Date: 2015-11-25
EASTERN BOILER CONTROL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the above-mentioned technical problems, the present invention provides a measuring device and method that uses dual lasers to produce gaps in thermal power plant air preheater rotor deformation, which solves the problem that the single laser measuring method is difficult to eliminate the interference caused by high temperature on the measuring process and results

Method used

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  • Measurement apparatus and method for monitoring clearance generated by air preheater by using double laser
  • Measurement apparatus and method for monitoring clearance generated by air preheater by using double laser
  • Measurement apparatus and method for monitoring clearance generated by air preheater by using double laser

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Effect test

Embodiment 1

[0034] Such as Figure 1 to 3 As shown, a measuring device using dual lasers to monitor the gap of the air preheater includes two identical laser measuring mechanisms 505 and 506 arranged laterally next to the sector plate 10, specifically, it consists of a first laser measuring mechanism 505 and The second laser measuring mechanism 506 is composed. Each laser measuring mechanism 505, 506 includes a laser ranging sensor 1 arranged on the outside 15 of the air preheater, an optical axis refraction lens barrel 2 passing through the outer wall of the air preheater 14, and an optical axis refraction lens barrel 2 opposite to the optical axis refraction lens barrel 2 Center air duct 3.

[0035] Wherein, a protective component 5 and a position adjuster 6 for installing the laser distance measuring sensor 1 are provided outside the laser distance measuring sensor 1. The optical axis refracting lens barrel 2 is connected with the position adjuster 6 through the transition piece 4. The ...

Embodiment 2

[0049] Such as Figure 3 to 5 As shown, a measurement method using dual lasers to monitor the gap of the air preheater, which uses the measuring device as in Example 1 to measure and calculate the gap value between the sector plate and the rotor, includes the following steps: aligning two laser measuring mechanisms , Horizontally and next to each other, they are installed at the same height, and the positions of the two laser measuring sensors are adjusted and calibrated. The measured value of the sector plate at the mechanical zero position under cold conditions is taken as the initial displacement value of the sector plate, and the sector plate position corresponding to this value is recorded as the starting zero point of the sector plate's absolute displacement. The current absolute displacement value of the sector plate refers to The displacement change amount relative to the starting zero point of the absolute displacement. Under cold conditions, the measured value of the...

Embodiment 3

[0054] In the cold state of the air preheater, the absolute displacement of the sector plate 10 is at the mechanical zero position, and the initial deformation of the air preheater rotor 11 is zero. At this time, the measurement results of the two laser distance measuring sensors 1 are respectively calibrated to the initial values ​​of the zero position of the deformation amount and the displacement amount and are included in the respective measurement mechanisms. When the hot rotor of the air preheater deforms or the sector plate is displaced, the difference between the current value of the rotor deformation and the current value of the sector plate displacement measured by the two laser ranging sensors 1 is the gap value. The rest is the same as in Example 2.

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Abstract

The invention provides a measurement apparatus and method for monitoring clearance generated in air preheater by using double laser. The apparatus includes two same laser measurement mechanisms which are horizontally arranged in a side by side manner. Each laser measurement mechanism includes a laser distance measuring sensor, an optical axis refraction lens barrel and a center air canister. An optical refraction assembly is arranged inside the L-shaped optical axis refraction lens barrel. One of the laser measurement mechanisms has a center air canister having a lower end aligned with a reflection calibration target and anther laser measurement mechanism has a center air canister having a lower end aligned with a detection angle iron of a rotor. The method includes two stages, namely setting an initial value and conducting real measurement, and a clearance value as required will be obtained by subtraction between the results measured by the two laser measurement mechanisms. According to the invention, the apparatus is simple in structure and the method is novel. The apparatus can perform whole-process monitoring of the clearance between the rotor of the air preheater and a fanning strip. The apparatus is characterized by high measuring accuracy, high temperature resistance, long service life, and convenient repairing and maintenance. The embodiments of the invention can be widely applied to the fields of monitoring thermal power plant, such as the clearance between the rotor of the air preheater and the fanning strip, rotor deformation, fanning strip displacement, and the like.

Description

Technical field [0001] The invention relates to an air preheater for auxiliary equipment of a thermal power station boiler, in particular to a device and a method for measuring the gap generated by the deformation of the air preheater rotor of the thermal power station by using dual lasers. Background technique [0002] The rotary air preheater in large thermal power plants is an extremely important auxiliary equipment in power plant boilers. Its rotor will deform after being heated, and the sealing gap control is controlled by the control system to control the fan-shaped plate lifting device to lift the fan-shaped plate at the hot end of the air preheater. To track the thermal deformation of the rotor, to achieve the best hot end radial sealing gap. Therefore, the deformation detection of the rotor after heating is extremely important in the entire gap sealing control system, and it is the basis of the air preheater air leakage control. [0003] As a current way to measure the ga...

Claims

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Application Information

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IPC IPC(8): G01B11/14
Inventor 虞东唐福彬朱存平
Owner EASTERN BOILER CONTROL CO LTD
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