Coal blending and coking method with participation of 1/3 coking coal having volatile of 28-32%

Abstract

The invention discloses a coal blending and coking method with participation of 1 / 3 coking coal having the volatile of 28-32%. The caking index G value of the 1 / 3 coking coal is larger than or equal to 85, and the maximum thickness Y value of a plastic layer is larger than or equal to 20.0mm. The method includes the steps: firstly, detecting gieseler fluidity of single types of coal to obtain themaximum fluidity MF and rubber expansion b of the coal; and secondly, determining a coal blending scheme according to the detection results obtained at the step one, using the coal as fat coal for coal blending when the maximum fluidity MF is equal to or larger than 10000ddpm while the rubber expansion b is equal to or larger than 150%, and using the coal as 1 / 3 coking coal for coal blending whenthe maximum fluidity MF is smaller than 10000ddpm while the rubber expansion b is smaller than 150%. The 1 / 3 coking coal with the volatile of 28-32% is reasonably differentiated according to indexes of the maximum fluidity MF and rubber expansion b and then subjected to coal blending and coking, so that coal resources can be effectively utilized. Coke quality is stably improved without adoption of coal humidifying, coal briquette technique and pre-crushing process, and CSR (coke strength after reaction) of cokes coked in coke ovens higher than 6m is larger than 63%.

Description

technical field [0001] The invention belongs to the technical field of coking coal blending, and in particular relates to a coking coal blending method involving 1 / 3 coking coal with a volatile content of 28-32%. Background technique [0002] In recent years, with the rapid development of iron and steel enterprises, the demand for coking coal has increased greatly, especially for moderately metamorphic and strongly caking coal (fat coal, coking coal and 1 / 3 coking coal). In the coal blending scheme, the functions of coking coal, fat coal and 1 / 3 coking coal are completely different. Coking coal is the main support for the quality of coke, and fat coal can adjust the rheology and expansion of blending coal in coal blending and coking. It can be blended A certain amount of weakly viscous coking coal is used to provide a certain granular structure to support the thermal properties of coke, and 1 / 3 of the coking coal mainly provides granular structure to support the thermal prop...

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Problems solved by technology

In my country, the use of this type of coking coal mainly depends on the vitrinite reflectance and distribution of traditional coal quality indicators and coal rock indicators. These two indicators and their combination indicators have certain defects. According to these methods, the Colloidal properties of 1 / 3 coking coal with large differences in volatile content are used for coal blending and coking, and 1 / 3 coking coal cannot be used reasonably, which will seriously affect the quality of the coke produced.

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