Process for dryness, formation and further processing of water-enriched lignite

Abstract

The invention provides a process for dryness, formation and further processing of water-enriched lignite. The process mainly comprises storage of the lignite, material transfer, crushing of lignite grains, rotary drum-shaped body multi-pipe drying, refined crushing, heating, hot pressing forming, screening and material return. The products can be used in process engineering in the fields of transportation, smelting, combustion, power generation or aerification. In the drying process, a rotary drum-shaped body multi-pipe drying device is used, and low-pressure vapor is indirectly used in the drying process, thereby avoiding the explosion due to the reaction of volatile compounds and oxygen, which is caused by too high temperature in the drying process; and in the forming process, little amount of internal water in capillary tubes of the lignite is used as a bonding agent, at certain temperature and grain size and under a certain pressure, gaps between lignite grains are filled by hot pressing so as to strengthen the contact between the lignite grains for forming. Because the hot pressing damages the structure of the capillary tubes of the lignite, the capillary tubes of the lignite are difficult to restore the original spongy property, thereby reducing the secondary adsorption water of the lignite grains. The process has the advantages of improving economic values of the lignite and causing little environmental pollution, along with safe drying and forming process.

Description

technical field [0001] The invention relates to the technical field of comprehensive and high-efficiency utilization of water-rich lignite for quality improvement, in particular to a process for drying, molding and quality-enhancing water-rich lignite and key equipment thereof. After the water-rich lignite is crushed, dried, formed and upgraded, it can meet the requirements of using the water-rich lignite boiler to generate electricity or pure oxygen to produce synthetic raw material gas. Background technique [0002] Because lignite contains 15wt% to 50wt% of water, it directly participates in combustion or coal gasification. On the one hand, it needs to consume a lot of energy during the ignition process; on the other hand, lignite has high volatile content and is prone to explosion. In addition, since the process of water evaporation will take away a large amount of heat energy, resulting in a large heat loss in combustion exhaust, low thermal efficiency of power generati...

AI Technical Summary

Problems solved by technology

[0005] The traditional drying process uses flue gas or steam-air combined heat medium to directly contact lignite to heat it, water evaporates, and the efficiency is low; improper drying can also cause local overheating, coal quality deterioration, and poor control can easily cause explosions

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