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Sampling film and method for detection and analysis of iron ore sintering flue gas ultrafine particles by using sampling film

A technology of ultra-fine particles and sintering flue gas, applied in the field of iron and steel metallurgy, can solve the problems of poor conductivity, low moisture content of flue gas, high content of impurity ions, etc., achieve corrosion-resistant substrate quality, large particle load capacity, and improve capture efficiency effect

Inactive Publication Date: 2016-09-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] It can be seen that the sintering flue gas has multiple factors that are not conducive to the collection of ultrafine particle samples, such as large flow rate and temperature variation, high flue gas water vapor content, and corrosive gases such as SOx, NOx, HF, and HCl.
Therefore, the flue sampling method of WY type, LPI, ELPI and other impact particle sampling equipment widely used in the field of coal combustion is only suitable for sampling environments with relatively stable working conditions and low moisture content of flue gas. The sampling membrane has not been considered for corrosion resistance, high temperature resistance, etc., and cannot adapt to the complex conditions of sintering flue gas, and it is difficult to directly copy it to the sampling of ultrafine particles in sintering flue gas
[0004] In addition, various pollutants such as heavy metals, alkali metals, dioxins and furans in sintering flue gas can be transformed into particulate matter through evaporation-condensation-crystallization, which makes the composition of particulate matter extremely complex. Single-layer membranes such as membranes, Telfon membranes, and quartz membranes are difficult to directly analyze the particle morphology and the content of major and trace elements due to their shortcomings such as high impurity ion content and poor conductivity, which also increases the subsequent accurate analysis of particle physical and chemical properties. feature difficulty

Method used

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  • Sampling film and method for detection and analysis of iron ore sintering flue gas ultrafine particles by using sampling film
  • Sampling film and method for detection and analysis of iron ore sintering flue gas ultrafine particles by using sampling film
  • Sampling film and method for detection and analysis of iron ore sintering flue gas ultrafine particles by using sampling film

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Experimental program
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Effect test

Embodiment 1

[0039] According to the shape and size of the dust plate of the domestic WY impact dust classifier, a polytetrafluoroethylene film with a thickness of 0.2mm is used to make a matching base film, and a polyimide tape with a thickness of 0.13mm or Graphite carbon conductive tape is evenly pasted on the surface of the base film to prepare a sampling film; the prepared sampling film is heated to a constant weight in a 150oC vacuum drying oven, then taken out and placed in a drying dish to cool to room temperature, and the accuracy of the sample is 0.01mg The analytical balance weighs the weight in the sampling film; the sampling film is installed on the dust plate, and under the sintered raw material conditions shown in Table 1, the required ultrafine particle samples are collected according to the operation method stipulated in the national sampling standard for particulate matter; sampling The final sampled film was placed in a vacuum drying oven at 100°C for 0.5 h, then taken ou...

Embodiment 2

[0041] According to the shape and size of the dust plate of the domestic WY impact dust classifier, a PTFE film with a thickness of 0.4mm is used to make a matching base film, and a polyimide tape with a thickness of 0.2mm or The silver conductive tape is evenly pasted on the surface of the base film to prepare a sampling film; the prepared sampling film is heated to a constant weight in a vacuum oven at 150°C, and then taken out and placed in a drying dish to cool to room temperature. The accuracy of the sample is 0.01mg The analytical balance weighs the weight in the sampling film; the sampling film is installed on the dust plate, and under the sintered raw material conditions shown in Table 1, the required ultrafine particle samples are collected according to the operation method stipulated in the national sampling standard for particulate matter; sampling The final sampled film was placed in a vacuum drying oven at 100°C for 0.5 h, then taken out and placed in a desiccator ...

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Abstract

The invention discloses a sampling film and a method for detection and analysis of iron ore sintering flue gas ultrafine particles by using the sampling film, wherein the sampling film comprises a polytetrafluoroethylene substrate film and a high-temperature-resistant adhesive tape or conductive tape attached on the surface of the substrate film. The sampling film has the advantages of high temperature resistance, corrosion resistance, strong electrical conductivity, good particle adhesion property and the like, is used in a series of particle trap devices such as an impact type dust particle grading instrument WY, Anderson, LPI, ELPI and the like, and can achieve ultrafine particle high-efficiency trapping and accurate quantification of mass and concentration; and after decomposition, the sampling film can be used for ICP-MS or directly used for SEM-EDS analysis of ultrafine particle morphology characteristics, the contents of major and trace components and other physicochemical characteristics.

Description

technical field [0001] The invention relates to a method for sampling and analyzing ultrafine particle pollutants in iron ore sintering flue gas, in particular to a sampling film for ultrafine particle matter in iron ore sintering flue gas and a method for analyzing ultrafine particle matter in iron ore sintering flue gas based on membrane detection , belonging to the field of iron and steel metallurgy. Background technique [0002] The waste gas volume of the sintering process accounts for about 40% of the total waste gas volume of the iron and steel industry. The flue gas emitted during the sintering process contains not only particulate matter, but also corrosive pollutants SO x , NO x , HF, HCl, highly carcinogenic dioxins and furans (PCB, PAH and PCDD / F), heavy metals (Hg, Pb, Cr, Cu, Cd, etc.) and alkali metals (K, Na, etc.) and other pollutants. Among them, the concentration of particulate matter in sintering flue gas is 0.5-6g / m 3 Between, SO 2 The content is ge...

Claims

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Application Information

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IPC IPC(8): G01N1/22G01N5/02
CPCG01N1/2258G01N5/02
Inventor 范晓慧季志云甘敏陈许玲姜涛李光辉袁礼顺李强周阳吕薇黄柱成杨永斌郭宇峰李骞张元波田野汪国靖王英坡王燕南
Owner CENT SOUTH UNIV
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