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Method for measuring stacking height equivalent of oxide skin in boiler pipe

A measurement method and oxide skin technology, which is applied in the boiler field, can solve problems such as the adverse effects of production management, the inability to quantitatively measure the height of oxide scale accumulation, and the inability to accurately judge pipe cutting, so as to realize intelligent detection, improve detection reliability and detection work efficiency effect

Pending Publication Date: 2020-05-22
国能锅炉压力容器检验有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the number of elbows on the high-temperature heating surface of a typical super (super) critical boiler is 3,000 to 6,000, and a large number of detection tasks must be completed in a relatively short period of time. Quantitative measurement of stacking height makes it impossible to accurately judge whether pipe cutting is required, thus adversely affecting production management

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  • Method for measuring stacking height equivalent of oxide skin in boiler pipe
  • Method for measuring stacking height equivalent of oxide skin in boiler pipe

Examples

Experimental program
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Effect test

Embodiment 1

[0028] figure 1 It is a flow chart of a method for measuring the accumulation height equivalent of scale in boiler tubes provided by the embodiment of the present application.

[0029] Such as figure 1 As shown, the measurement method provided in this example is used to obtain the accumulation height equivalent of the internal scale of the pipe sample used for the test. The method specifically compares the measured value of the internal scale of the pipe by converting the measured value of the internal scale of the pipe into the corresponding internal accumulation of the pipe. The height of the scale, specifically including the steps:

[0030] S11. Making a test pipe sample with a preset length.

[0031] Specifically, cut the pipe with a preset length. The material, specification and thermal parameters of the pipe should be similar to or the same as the material, specification, thermal parameter and cumulative running time of the pipe to be tested in the actual project, pref...

example A

[0052] The boiler model to be tested is the high temperature superheater tube of HG-1913 / 25.4-YM3. The boiler has supercritical parameters, the outlet temperature of the superheater is 571°C, the steam pressure is 25.4MPa, and the cumulative operating time is 2876.5h; the size of the superheater tube is Ф50×8mm, and the grade of austenitic steel used is SA213-TP347H.

[0053] A.1 Making calibration tubes

[0054] Use the Ф50×8mm, SA213-TP347H pipes of the high-temperature superheater sampled for inspection of the boiler, and use a lathe or sawing machine to cut a section of 150mm long pipes. After cutting, use a vernier caliper to measure the length, the error is not more than 1mm, and the two ends are basically perpendicular to the axis of the pipe.

[0055] A.2 Connect the scale detector used for detection to the probe reliably, and set the instrument to zero when the probe is far away from ferromagnetic substances.

[0056] A.3 According to the percentage d% (or h) of the...

example B

[0060] The boiler model to be tested is the high temperature superheater tube of B&WB-2082 / 28.0-M. The boiler has ultra-supercritical parameters, the outlet temperature of the superheater is 605°C, and the steam pressure is 28.0MPa. It was put into operation in January 2013, and the cumulative operating time is 43625.7h; the specification of the superheater tube is Ф41.3×7mm, and the austenitic steel used The grade is Super304HSB.

[0061] B.1 Making Calibration Tubes

[0062] Use the high-temperature superheater Ф41.3×7mm and Super304HSB pipes sampled for inspection and maintenance of the boiler, and use a lathe or sawing machine to cut a section of 100mm-long pipe. After cutting, use a vernier caliper to measure the length, the error is not more than 1mm, and the two ends are basically perpendicular to the axis of the pipe.

[0063] B.2 Connect the scale detector used for detection to the probe reliably, and set the instrument to zero when the probe is far away from ferrom...

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Abstract

The invention discloses a method for measuring the stacking height equivalent of oxide skin in a boiler pipe, and the method comprises the steps: selecting a steel pipe, manufacturing a test pipe, measuring the length and inner diameter of the test pipe, and calculating the volume of the pipe; filling the test pipe with the oxide skin, pouring out the oxide skin, weighing the mass of the oxide skin, and calculating the density of the oxide skin; respectively loading oxide skin samples with different masses into the test pipe, and calculating to obtain the stacking height of the oxide skin in auniform distribution state after the pipes are flatly placed; and using the oxide skin detector for measuring successively to obtain test data corresponding to each oxide skin sample, wherein the test data is called as the stacking height equivalent of the calculation height of the oxide skin stacked in the corresponding pipe. During actual engineering detection, detection technicians can utilizetest data to improve the detection reliability and the detection work efficiency, and intelligent detection can be realized.

Description

technical field [0001] The present application relates to the technical field of boilers, and more specifically, to a method for measuring the accumulation height equivalent of oxide scales in boiler tubes. Background technique [0002] At present, thermal power boilers are developing towards high-parameter ultra-critical boilers. High temperature and pressure make it difficult to avoid steam oxidation inside the high-temperature heating surface pipes in the boilers, thereby generating scale inside the pipes. During the operation of the boiler, the oxide scale inside the pipe will peel off under certain conditions and accumulate at the "U" bend, causing the bend to be blocked, which is a serious threat to the safe operation of the generator set. Therefore, during the operation of the boiler, it is necessary to regularly detect the accumulation of oxide scales in the boiler tubes. When a certain accumulation height is reached, the tubes should be cut to remove the accumulated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N9/36
CPCG01N33/00G01N9/36
Inventor 谢航云代真许永胜赵月矫延林
Owner 国能锅炉压力容器检验有限公司