PROCESS AND SYSTEM FOR UPGRADING LIGNITE BY VIBRATION HOT-PRESSING DEHYDRATION

摘要

A process and system for upgrading lignite by vibration hot-pressing dehydration, belonging to processes and systems for coal processing and cleaning. The system: a discharge port of a raw coal bin is connected with a feed port of a fan-milled powder pre-drying device, a discharge port of the fan-milled powder pre-drying device is connected with a feed port of an upgrading device by vibration hot-pressing dehydration through a powdered coal bin and a distributing device, a steam generating device is connected with a steam inlet of the upgrading device by vibration hot-pressing dehydration through a steam switching valve, a water outlet of the vibration hot-pressing dehydration upgrading device is connected with the inlet of the upgrading device by vibration hot-pressing dehydration at one end and is discharged through a waste water purification system at another end, via a three-way valve; the process: the fan-milled coal powders are conveyed into the upgrading device by vibration hot-pressing dehydration, is preheated and then sealed, steam is introduced into the device to heat the coal until the coal is heated to the process temperature, then the introduction of steam is stopped and the coal is dewatered and formed. The lignite can be efficiently dehydrated and formed in a relatively short time under comparatively mild process conditions, preventing reabsorption and spontaneous combustion, so that the lignite can be conveniently stored and transported.