Detecting method and system for rapidly determining proportion of cokes in furnace ash of blast furnace

A detection method and blast furnace technology, applied in the direction of removing certain components and weighing, can solve the problems of high detection cost, large workload, laborious implementation, etc., and achieve low cost, convenient operation and strong adaptability. Effect

Active Publication Date: 2019-01-11
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) In the prior art, the detection process has a huge workload and is quite time-consuming, and the experimental results are greatly influenced by the operator's subjectivity, which requires a lot of professional knowledge and is obtained by experience, and the counting method can only determine coke and The surface area ratio of unburned coal powder cannot determine the respective carbon content, and if the data is to be accurate, a large number of repeated experiments must be carried out
[0009] (2) The X-ray diffraction test method and the Raman spectroscopy test method have high requirements for instruments and high testing costs, and are not suitable for daily testing in steel mills. At the same time, these two methods need to prepare standard samples, which are different from actual production There are bound to be differences, and it is difficult to guarantee the accuracy of the results
[0010] Elemental analysis can get the total carbon content in the blast furnace dust, but it cannot distinguish whether it is from unburned coal powder or coke in the blast furnace
[0011] The single use of the above methods cannot quantitatively analyze the source of carbon in the blast furnace dust, and combined use requires a huge workload, and it is very laborious to implement, and the operability is not strong, so it is not suitable for daily use in production

Method used

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  • Detecting method and system for rapidly determining proportion of cokes in furnace ash of blast furnace
  • Detecting method and system for rapidly determining proportion of cokes in furnace ash of blast furnace
  • Detecting method and system for rapidly determining proportion of cokes in furnace ash of blast furnace

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Experimental program
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Effect test

preparation example Construction

[0059] S101: The preparation of samples is as follows: pre-obtain coal powder and coke with different particle sizes and grades, perform acid washing and deashing treatment, and then simulate the temperature change process of coke and coal powder in the blast furnace to prepare pyrolysis coke after different temperature treatments and unburned pulverized coal, according to coal char and CO 2 Gas reaction, investigate the influence of particle size on the reactivity of coal char gasification, determine the particle size of the sample, and reduce the number of tests in the later stage; investigate the influence of temperature on the reactivity of coal char gasification, and determine the gasification reaction temperature;

[0060] S102: The reactivity test is: in order to reduce the error, show the difference in the reactivity of coal coke in the furnace dust, determine the content of coal coke in the furnace dust more accurately, take the addition of alkali metal as a catalyst, ...

Embodiment 1

[0100] 1) Grind the coal sample, coke sample and furnace dust sample to less than 0.15mm, first carry out two 35% hydrochloric acid pickling treatments for 6 hours, then carry out two 40% hydrofluoric acid pickling treatments for 6 hours, and suction filter After drying, it was placed in a muffle furnace and burned for 2 hours, and the results are shown in Table 2.

[0101] Table 2..

[0102] sample

coal

coke

furnace dust

Ash

0.13％

0.15％

0.25％

[0103] Coal coke and furnace dust are approximately considered to be washed without ash, while furnace dust is considered to be composed of coal powder and coke powder. Then choose to pyrolyze the coke sample below 0.15mm, spread the dry coke powder in a corundum crucible, and place it in a box-type atmosphere furnace with N2 figure 2 ,

[0104] Then start heating up. Raise to four different final temperatures of 1100°C, 1200°C, 1300°C, 1400°C, and 1500°C at a heating rate of 5°C / min, and...

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Abstract

The invention belongs to the field of coke component measurement and discloses a detecting method and system for rapidly determining the proportion of cokes in furnace ash of a blast furnace. The detecting method comprises the following steps: measuring the reactivity of carbon-containing substances in the furnace ash and CO2 according to the different reactivity of uncombusted coal powder and cokes in the furnace ash and CO2 at low-medium temperature; adding a catalyst, then, respectively measuring the change rates of the reactivity in the uncombusted coal powder, the cokes and the furnace ash, and calculating the proportions of the uncombusted coal powder and the cokes in the furnace ash. By using the method comprising the steps: measuring the reactivity of carbon-containing substances in the furnace ash and CO2 according to the different reactivity of the uncombusted coal powder and the cokes in the furnace ash and CO2 at low-medium temperature, adding the catalyst, and then respectively measuring the change rates of the reactivity in the uncombusted coal powder, the cokes and the furnace ash and estimating the proportions of the uncombusted coal powder and coke powder in the furnace ash, scientific guidance is provided for increasing the coal spraying quantity of the blast furnace and the replacement ratio of coal powder, and a simple, easy, accurate and reliable method forestimating the carbon-containing substance component in the furnace ash is provided for steel and iron plants.

Description

technical field [0001] The invention belongs to the field of coal coke component measurement, in particular to a detection method and a detection system for quickly determining the proportion of coal coke in blast furnace dust. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] There is currently no way to detect blast furnace dust by reactivity, but the current common techniques for detecting blast furnace dust are the method of digital emission and X-ray diffraction and Raman spectroscopy. [0004] Counting points is to prepare samples of the obtained furnace dust and ash samples, put them under the spectrophotometer for observation, and make 500 points to determine the proportion of coal coke. The workload in the detection process is huge and time-consuming, and the experimental results are subject to the operator's control. The subjective influence is very large, and a lot of professional knowledge ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor熊玮程宏峰周进东魏耀武毕学工汤耀
OwnerWUHAN UNIV OF SCI & TECH