Heat pressing moulding process and equipment for lignite rich in water after drying process

Abstract

The invention discloses hot press molding technology and equipment for water-rich lignite after drying treatment. The technology comprises the following steps that: (1) the dried water-rich lignite of which the water content is between 8 and 15wt percent and the particle size is less than or equal to 6.3mm is further crushed until the particle size is less than or equal to 2mm, and is taken as a feed raw material of a high-pressure roll squeezer; and (2) the hot press molding technology that the lignite is not needed to be added with an adhesive is adopted , the lignite raw material is sent into a material mold through two rolls with opposite rotation motion of the high-pressure roll squeezer, and is pressed into a required shape in the material mold, the temperature for the molding pressing of the lignite is between 60 and 90 DEG C, the pressure for the molding pressing of lignite briquettes is 8,000kN, and the briquette pressure in the unit length is between 24 and75KN / cm. The high-pressure roll squeezer is mainly combined by a positive movement roll shaft, a reverse movement roll shaft, the material mold, a hydraulic speed regulation device, a motor and a support. The briquette pressed by the hot press molding can meet the technological requirements of long-distance transportation and boiler combustion or pure oxygen gasification of coal chemical industry. The process of the hot press molding of the briquette is safe, reliable, economical and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of hot-press molding of dry granular materials, in particular to a hot-press molding process and equipment after drying rich lignite, which changes the capillary structure of lignite and reduces the dry Air or water reabsorbs moisture. Background technique [0002] Mining lignite with a water content of up to 15wt% to 50wt% is directly used for combustion, not only the boiler combustion is unstable, but also the efficiency is very low. High moisture makes these coals only available locally, and it is impossible to transport them over long distances and use them in high-value-added gasification processes, thus greatly limiting the scale of coal mining. Therefore, it is very necessary to dry the lignite with high water content. [0003] Drying (ie, evaporative drying) processes include direct drying and indirect drying. Dryers are further divided into fixed bed, fluidized bed, rotary kiln and tubular dryers...

AI Technical Summary

Problems solved by technology

Since the evaporation of water in the drying process is a process that consumes a lot of heat energy, if traditional hot flue gas is used to dry coal rich in water, the evaporated water contains a large amount of air, so the latent heat of water cannot be fully utilized

Therefore, the traditional drying technology is not suitable for the drying of lignite rich in water

Images