Method for preparing coking coal by modification by low-order nonadhesive coal

Abstract

The invention discloses a method for preparing coking secondary coal by modification by low-order nonadhesive coal, which comprises: drying the low-order nonadhesive coal and roughly grinding the low-order nonadhesive coal till the particle size is smaller than 0.3 millimeter, and mixing the ground low-order nonadhesive coal with treated high-temperature coal tar; mixing the mixture with a hydrogenation solvent and a catalyst, adding the obtained mixture into a give reactor to perform a hydrogenation reaction, wherein the reaction time is 350 to 420 DEG C, the dwelling time is 30 to 60 minutes, and the system pressure is 9 to 16MPa, the weight part ratio of the particle mixture to the hydrogenation solvent is 1:(1-3), and the weight part ratio of the particle mixture to the catalyst is 1:(0.01-0.06); and finally, distilling the reaction product under a reduced pressure to obtain the solid modified coking coal. The caking index G of the solid product (modified coking coal) of the method is more than 75, the average maximum reflectivity of vitrinite is about 0.7 and can partially replace primary coking coal for coking with secondary coal. The method has an obvious industrial application prospect.

Description

technical field [0001] The invention relates to a method for preparing coking coal, in particular to a method for preparing coking coal by upgrading low-order non-caking coal, which hydrogenates and upgrades coal that has no caking property and is generally not used in the coking industry. Background technique [0002] Coking coal is heated to 950-1050°C in the absence of air, and finally made into coke through drying, pyrolysis, melting, bonding, solidification, shrinkage and other stages. This process is called high-temperature coking (high-temperature dry distillation). The coke obtained from high-temperature coking is used in blast furnace smelting, casting and gasification. The recovered and purified coke oven gas produced in the coking process is not only a fuel with high calorific value, but also an important industrial raw material for organic synthesis. The caking index G of coking coal must generally be above 60, and at the same time, it is required to have low ash...

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Problems solved by technology

[0005] In recent years, there are few studies on hydrogenation and upgrading of low-metamorphism bituminous coal to make coking coal, and most of them focus on gas-phase hydrogenation. From the existing research results, the effect is not obvious. There have been researches on gas-liquid mixed hydrogenation. After research, there are patent reports that choosing tetralin as a hydrogenation solvent can significantly improve the caking property of non-caking coal, but using tetralin as a hydrogenation solvent has no industrial value, and the caking index G of the product can only be Reaching about 60, the process stays in the batch test stage

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