Strength determination method and device for reacted blast furnace coke

Abstract

The invention discloses a strength determination method for reacted blast furnace coke, which comprises the following steps of: (1) placing a coke sample in a reactor; (2) putting the reactor in an electric heating furnace; (3) inserting a temperature thermocouple into the coke in the reactor;(4) putting an electronic balance on a lifting table and connecting the electronic balance and the reactor through a chain; (5) regulating the electric furnace to heat through a temperature controller and introducing nitrogen when the temperature in the center of a material layer reaches 400 DEG C; (6) introducing carbon dioxide gas when the temperature in the center of the material layer reaches 780 DEG C; (7) cutting the nitrogen and introducing prepared mixed gas when the temperature in the centerof the material layer reaches a certain value, maintaining the temperature of the heating furnace, and when the loss ratio of the coke samples reaches the required value continuously introducing the carbon dioxide gas or the mixed gas, introducing the nitrogen and cooling after the carbon dioxide gas or the mixed gas reaches the specified dissolve loss quantity; and (8) stopping introducing the nitrogen and cooling naturally when below 100 DEG C. The invention more truly reflects the actual conditions of the coke in a blast furnace, and the prediction of the thermal properties of the coke is more accurate.

Description

technical field [0001] The invention relates to a method and a device for measuring thermal properties of coke used in a blast furnace. Background technique [0002] With the continuous improvement of the ironmaking process, the requirements for the thermal properties of coke are getting higher and higher, especially the role of coke as a skeleton in metallurgy is particularly important. Coke reactivity (CRI) and post-reaction strength (CSR) are two important indicators for evaluating the quality of coke. At present, the thermal performance evaluation methods of coke used in the world (including GB / T4000-1996) are formulated with reference to the test method published by Nippon Steel in the 1980s. The test method is: make coke into 19-21mm blocks, shrink Take 200g, at 1100℃, with 5Nl / min of 100% CO 2 React for 2 hours, and the reaction weight loss rate is reactive CRI. The coke after the reaction is sieved in a type I drum (φ130×L700mm) and rotated for 600 revolutions (20r...

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Problems solved by technology

[0010] This method has several deficiencies: First, the experimental temperature is fixed at 1100°C, and the actual reaction temperature of coke above the soft melting zone in the blast furnace is between 800-1400°C. 2 The reaction temperature is different, and the rate of reaction is also different at different temperatures; two, use 100% CO 2 It is not consistent with the actual reaction atmosphere of coke above the soft melting zone in the blast furnace. Different cokes have different concentrations of CO and CO 2 The reaction rate in the atmosphere is not the same; three, the reaction time of 2 hours does not match the actual reaction time of coke above the soft melting zone in the blast furnace

In short, this test method fails to correctly simulate the actual reaction loss of coke in a modern blast furnace. A large number of tests show that this test cannot reflect the real situation of coke in a blast furnace. Excessively weakened; on the contrary, some cokes are over-strengthened after the reaction due to incomplete reaction

Nippon Steel also found that when the adsorption catalyst high reactivity coke was tested, if the traditional method was used to evaluate the thermal performance of the coke, since the reaction was carried out under a certain reaction time, the reaction weight loss of the high reactivity coke was excessive, and the impact powder resistance after the reaction chemical performance will inevitably decrease

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