Method for drying coking coal materials

Abstract

The invention discloses a method for drying coking coal materials. The method comprises two stages of drying processes, wherein in the first stage drying process, the coking coal materials are classified into three types of grain sizes through air separation, the separated coking coal materials with the first type and second type grain sizes are mixed and crushed after the first stage drying, andthen the first stage drying is re-performed, and the coking coal material with the third type grain size is subjected to the second stage drying after the first stage drying; and in the second stage drying process, the coking coal materials are dried to ensure that the water content is less than 2 percent. During the first stage drying of the method, the coking coal materials are separated according to the grain sizes successively, so not only the grain size classification effect of the coking coal materials is better, but also a discharge port is prevented from being blocked up by one-time separation. Besides, the method makes full use of waste gasses and residual heat generated in the production process of coking plants, and fully saves energy sources. Furthermore, for powdered coal grains with a small grain size in the method are collected by using a bag-type dust remover and then are formed in a forming device, so the method improves the coking performance of powdered coals and simultaneously solves the dust-raising problem of the powdered coals.

Description

technical field [0001] The invention relates to the technical field of coking in the metallurgical industry, in particular to a method for drying coking coal materials. Background technique [0002] With the expansion of the production capacity of the iron and steel industry, high-quality coking coal resources are becoming more and more scarce; at the same time, the increasingly stringent national environmental protection regulations have also gradually strengthened the awareness of energy conservation and environmental protection of enterprises. Therefore, coal humidity control technology is increasingly used in the coking industry. and promotion. [0003] According to the previous research conclusions, it can be known that drying the moisture of coking coal material to below 2% has a very good effect on saving high-quality coking coal resources, improving coke quality and output, and energy saving. [0004] At present, some coking plants in China use the flue gas produced...

AI Technical Summary

Problems solved by technology

[0004] At present, some coking plants in China use the flue gas produced by coke oven coking to adjust the humidity of the incoming coal. However, due to the limitation of the flue gas volume and temperature of the main process, the moisture of the coking coal can only be dried to 8- 9%, the effect of saving high-quality coking coal resources, improving coke quality, and energy saving is not obvious; a coking plant in Shandong uses flue gas to adjust the humidity of the incoming coal, and adopts a self-developed dual-zone two-stage The moving partition type large-scale fluidized bed classifies the coal materials. Also limited by the exhaust gas volume and temperature of the main process flue, the moisture content of the coking coal materials can only be dried to 8-9%.

Images