Method for measuring ratio of each iron oxide in mixture
A technology of iron oxides and mixtures, applied in the direction of using radiation for material analysis, etc., can solve the problem that it is difficult to formulate maintenance and inspection plans, it is difficult to accurately judge the formation and distribution of oxide scale in the pipeline, and it is impossible to measure the proportion of iron oxides in mixtures. and other problems, to achieve high accuracy, simple method, and the effect of reducing possible harm
Inactive Publication Date: 2015-06-03
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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[0011] The purpose of the present invention is to provide a method for measuring the proportion of each iron oxide in the mixture, so as to solve the problem that the existing method cannot measure the proportion of various iron oxides in the mixture. Taking the scale in the steam pipeline as an example, If the proportion of each iron oxide in the oxide scale is not known, it is difficult to accurately judge the formation and distribution of oxide scale in the pipeline according to the magnetic parameters, so it is difficult to formulate an appropriate maintenance and inspection plan to reduce the scale in the pipeline. Possible hazards caused by accumulation in
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[0028] The new austenitic heat-resistant steel Super304H used in power plants is adopted. This steel has high thermal strength and corrosion resistance. However, after the steel is oxidized, there is a large difference in thermal conductivity between the scale and the matrix. The thermal expansion coefficient of the oxide is twice that of the oxide, so the problem of peeling off the scale in the actual use of the power plant is more serious. After the oxides accumulated in it are taken out, Mössbauer spectroscopy is used to measure them to obtain the proportion of iron oxides with different structures, which provides help for the use of magnetic detection means to detect the oxide scale accumulation content in the pipeline during operation.
[0029] Specific steps are as follows:
[0030] Step 1: Cut the Super304H pipe, take out the oxide skin, mix it evenly, put about 10mg into a corundum grinding bowl, grind it with a corundum mallet, and grind the sample into powder, then ...
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The invention provides a method for measuring a ratio of each iron oxide in a mixture. The method comprises the following steps: taking 5-15mg of a to-be-measured sample, grinding the sample into powder, and uniformly mixing; adding the ground powder sample into a transmission type Mossbauer spectroscope sample chamber, and measuring the relationship between gamma ray counting of an absorber and the modulation energy, namely Doppler velocity; and performing spectrum recognition and peak spectrum fitting, finally exporting the fitting result, and reading the ratio of the iron oxide of each structure in the sample. According to the method disclosed by the invention, the problem that the ratios of various iron oxides in the mixture cannot be measured in the conventional method is solved, and oxide skin in a steam pipeline is taken as an example, if the ratio of each iron oxide in the oxide skin is unknown, the generation amount and distribution condition of the oxide skin in the pipeline are difficultly accurately judged according to magnetic parameters, so that a proper maintenance and check plan is difficultly made, possible hazards formed by accumulation of the oxide skin in the pipeline are reduced. The method disclosed by the invention belongs to the fields of component measurement and analysis.
Description
technical field [0001] The invention relates to a method for measuring the proportion of iron oxides, in particular to a method for measuring the proportions of different types and structures of iron oxides in a mixture. Background technique [0002] At present, there is no method in the industry to determine the content / ratio of various iron oxides in the mixture, but in actual production applications, the determination of the content of various iron oxides in the mixture has great use value. [0003] Taking Super304H, which is more representative of the new austenitic heat-resistant steel, Super304H has become the main material for boiler reheaters and superheaters of ultra-(ultra)critical (USC) thermal power units at home and abroad. The service temperature of this type of steel is Higher, but during operation, the pipeline on the steam side will accelerate oxidation under the action of water vapor, and the oxide skin after long-term oxidation will have a certain thicknes...
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IPC IPC(8): G01N23/06
Inventor 陈俊卫牧灏蒋震
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD