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Utility boiler pressure-bearing pipe leakage location method based on plane octave array

A power station boiler, a technology of positioning method, applied in the direction of detecting the appearance of fluid at the leak point, using liquid/vacuum degree for liquid tightness measurement, etc., can solve the problem of costing a lot of manpower and time

Inactive Publication Date: 2012-12-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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AI Technical Summary

Problems solved by technology

For the case of leakage hole diameter of 1-4mm, the maintenance task often requires a lot of manpower and time, and the major technical problem it faces is to solve the problem of precise location of the leakage source

Method used

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  • Utility boiler pressure-bearing pipe leakage location method based on plane octave array
  • Utility boiler pressure-bearing pipe leakage location method based on plane octave array
  • Utility boiler pressure-bearing pipe leakage location method based on plane octave array

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Embodiment Construction

[0072] The present invention uses a plane eight-element array to accurately locate the leakage of the pressure-bearing tube of the power station boiler. The array structure of the microphone and its distribution in the furnace are as follows: figure 1 As shown, the arrangement of measuring points can be appropriately changed according to the site conditions. figure 2 Diagram of the precise location system for boiler pressure tube leakage. Combination of microphone and preamplifier (cs 1…… cs 8. ), using 1 / 2-inch pre-polarized electret measurement microphone MP201 (sensitivity 50Mv / Pa) and ICP preamplifier MA201. The output of the preamplifier is connected in series with the signal conditioner, DAQ board, PXI system and host; the positioning system is powered by 18V DC power supply; the preamplifier is used for the ICCP power supply of the microphone, and can filter and amplify the signal. There are three adjustment gears: 1x, 10x, and 100x, which are connected to the signa...

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Abstract

The invention discloses a utility boiler pressure-bearing pipe leakage location method based on a plane octave array, belonging to the technical field of thermal power generation utility boiler leakage monitoring. Based on the traditional acoustic thermometry system that a water wall leakage location system with eight measuring points based on the plane octave array is developed, time delay estimation is obtained by an adaptive filter algorithm of the LMS(Least Mean Square) algorithm, and the precise leakage position location of a boiler pressure-bearing pipe is achieved by the adoption of a three dimensional space algorithm improved from the CHAN algorithm in a TDOA (Time Difference of Arrival) location system based on a cellular network. The array arrangement is in reference with the arrangement of the traditional acoustic thermometry, so that temperature measurement and leakage signal location can be performed simultaneously, therefore the utility boiler pressure-bearing pipe leakage location method disclosed by the invention is efficient and precise.

Description

technical field [0001] The invention belongs to the technical field of boiler leakage monitoring in a thermal power station, and in particular relates to a method for locating leakage of a pressure-bearing tube of a planar eight-element array boiler in a power station. Specifically, it relates to the precise positioning technology of pipeline leakage in the boiler inner water wall, superheater, reheater and economizer of the thermal power generation unit. Background technique [0002] The basic principle of the acoustic monitoring method for furnace pipeline leakage is: arrange a microphone at a suitable position of the boiler (such as a fire viewing hole) to receive the leakage signal of the water wall. When the water-cooled wall leaks, the high-temperature and high-pressure steam in the pipe is ejected from the crack or breach, generating broadband noise and spreading along the air and metal pipes. However, the normal operation of the boiler will generate a strong backgro...

Claims

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Application Information

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IPC IPC(8): G01M3/24
Inventor 沈国清安连锁许伟龙张世平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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