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Test Method for Reactivity of Metallurgical Coke

A technology of metallurgical coke and measurement method, which is applied in the field of coking, can solve the problems such as the reactivity correlation of lump coke is not obvious, and achieve the effect of reducing dust pollution and reducing the emission of harmful gases

Active Publication Date: 2018-08-14
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Application Information

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Problems solved by technology

Therefore, the correlation between the gasification reactivity of micron coke and the reactivity of bulk coke is not obvious

Method used

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  • Test Method for Reactivity of Metallurgical Coke
  • Test Method for Reactivity of Metallurgical Coke
  • Test Method for Reactivity of Metallurgical Coke

Examples

Experimental program
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Embodiment Construction

[0017] (1) 500g of a certain coke sample is weighed and crushed, sieved, weighed to obtain 20g of a sample of 3-6mm, and the sample is packed into a reaction tube with an internal diameter of 20mm;

[0018] (2) Raise the reaction tube from room temperature to 1100°C in the heating furnace. After 400°C, 500mL / min nitrogen gas is introduced to protect the sample from oxidation. The gasification reaction between carbon dioxide and the sample is carried out, and the concentration of carbon monoxide and carbon dioxide in the tail gas after the reaction is detected by the gas online analysis device, and the conversion rate and conversion rate of the coke gasification reaction are calculated, and the weight loss of the coke sample can also be measured in real time by a balance And calculate the conversion rate and conversion rate of coke gasification reaction, the conversion rate-conversion rate curve of the coke sample is shown in figure 1 , it can be seen that when the conversion r...

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Abstract

The invention provides a method for detecting the metallurgical coke reactivity. The method comprises the steps that coke samples with the particle size of 3-6 mm and carbon dioxide are subjected to a gasification reaction at 1,100 DEG C, the conversion rates and the conversion speeds of the coke gasification reaction are obtained, and the average conversion speed V3-10(% / min) of the sample conversion rates ranging from 3% to 10% is calculated to serve as an index for evaluating the coke reactivity. Due to the fact that the reaction mode applied when the conversion rate of the coke in the particle size grade is controlled through a chemical reaction and internal diffusion, the control mode is the same as that of a briquette coke gasification reaction, and then the detected index V3-10 is highly related to the coke national standard reactivity CRI.

Description

technical field [0001] The invention belongs to the technical field of coking, in particular to the detection of coke reactivity for blast furnaces technical background [0002] Blast furnace smelting requires coke with stable and suitable reactivity. At present, the most commonly used method for detecting coke reactivity is the national standard GB / T 4000-2008. This method uses 200g of lump coke with a particle size of 23-25mm to react with carbon dioxide with a flow rate of 5L / min at 1100°C for 120min. The percentage of coke mass loss represents the coke reactivity index CRI (%). According to the requirements of the standard, this method needs to crush and screen out 200g of samples that meet the requirements in 20kg of coke, and requires a large amount of samples, which is suitable for the detection of industrial coke and large-scale tests. However, it is not suitable for the kilogram-level small-scale coking test in the laboratory to study the coking effect of coal ble...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04G01N33/22
Inventor 梁英华郭瑞孙章沈杰
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY