Infrared imaging detection method for accumulation rate of oxide scales in eddy current heating type heating surface pipe
A heating surface tube and infrared imaging technology, which is used in the measurement of the oxide scale accumulation rate on the inner wall of the heat-resistant stainless steel tube in service, and the infrared imaging detection field of the oxide scale accumulation rate in the eddy current heating heating surface tube, achieving small temperature difference and short heating time. , the effect of reducing noise
Pending Publication Date: 2021-01-22
JILIN ELECTRIC POWER RES INST LTD +3
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[0003] The invention provides an infrared imaging detection method for the oxide scale accumulation rate in the eddy current heating type heating surface tube to solve the problems existing in the measurement of the oxide scale accumulation rate in the heat-resistant stainless steel tube currently in service
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[0025] Include the following steps:
[0026] (1) Simply clean the outer surface of the heat-resistant stainless steel pipe to be tested to make it as smooth as possible, so as to eliminate the influence of the uneven thickness of the outer oxide layer on the measurement results, and use eddy current heating device, the heating element 1 and the heating element 2 are wound on the heat-resistant stainless steel pipe to be inspected, and a portable infrared measuring instrument is set up;
[0027] (2) According to the diameter and wall thickness of heat-resistant stainless steel pipes to be inspected on site, according to Figure 7 and Figure 8 As shown, select the appropriate installation distance between heating element 1 and heating element 2, the distance d is:
[0028] d=(-0.09552×X1+9.63707)×X2+0.03835×X1-0.14894
[0029] Among them: X1 is the diameter, X2 is the wall thickness, in mm, to ensure that the surface temperature difference between the two coils after heating...
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The invention relates to an infrared imaging detection method for an accumulation rate of oxide scales in an eddy current heating type heating surface pipe, and belongs to the field of nondestructivedetection. The infrared imaging detection method comprises the steps of: adopting an eddy current heating device, winding a heating assembly I and a heating assembly II on an in-service heat-resistantstainless steel pipe to be detected, and setting up a portable infrared measuring instrument; selecting a proper mounting distance between the heating assembly I and the heating assembly II, heatingthe in-service heat-resistant stainless steel pipe to be detected on site, and removing a heat source after heating; recording infrared thermal image signals in the heat dissipation process of the steel pipe by using a portable infrared measuring instrument; and acquiring the corresponding oxide scale accumulation condition by comparing measured values of the infrared measuring instrument with a drawn calibration chart of an oxide scale blockage area and thermal detection signals. The infrared imaging detection method has the advantages of short heating time, small temperature difference in adetection region, reduction of noise caused by heating temperature difference, improvement of detection accuracy, simple and efficient operation and wide application range, and a measurement result isobtained through comparison calculation of the measurement signals and a calibration graph.
Description
technical field [0001] The invention belongs to the field of non-destructive testing, and relates to an infrared imaging detection method for the oxide skin accumulation rate in an eddy current heating type heating surface tube, which is used for measuring the oxide scale accumulation rate on the inner wall of heat-resistant stainless steel pipes in service in thermal power plants, nuclear power, petrochemical and other fields. Measurement. Background technique [0002] In the power structure, thermal power will still occupy a dominant position for a long period of time. Improving power generation efficiency, reducing pollution, and saving resources are the development directions of thermal power units in my country. Ultra (super) critical thermal power units have the benefits of energy saving and emission reduction with low coal consumption and less pollutant emissions. It is an effective and realistic measure to improve the technical level of thermal power units in my coun...
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IPC IPC(8): G01N25/72H05B6/10
CPCG01N25/72H05B6/10
Inventor 杜好阳崔伦张双楠吕传仁
Owner JILIN ELECTRIC POWER RES INST LTD