Process and system for vibration hot-pressing dehydration quality improvement of brown coal

Abstract

The invention relates to a process and system for vibration hot-pressing dehydration quality improvement of brown coal, belonging to processes and systems for processing and cleaning coal. According to the system, a discharge port of a run 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 a vibration hot-pressing dehydration quality improvement device through a powdered coal bin and a distributing device, a steam generator is connected with a steam inlet of the vibration hot-pressing dehydration quality improvement device through a steam switching valve, one end of a water outlet of the vibration hot-pressing dehydration quality improvement device is connected with the inlet of the vibration hot-pressing dehydration quality improvement device through a three-way valve, and the other end of the water outlet of the vibration hot-pressing dehydration quality improvement device is used for discharging water through a waste water purification system; and according to the process, the fan milled powdered coal is conveyed into the vibration hot-pressing dehydration quality improvement device and then preheated and hermetically sealed, steam is introduced into the device and is stopped when the coal is heated to the process temperature, and then the coal is dehydrated and formed. The brown coal can be efficiently dehydrated and formed in a shorter acting time under a comparatively mild process condition, and relapsing and spontaneous combustion are prevented, so that the brown coal is convenient to store and transport.

Description

technical field [0001] The invention relates to a coal processing and cleaning process and system, in particular to a lignite vibrating hot-press dehydration and upgrading process and system. technical background [0002] Energy and the environment are important guarantees for the sustainable development of the national economy and society. In 2020, coal will still account for about 60% of the national energy mix. In 2050, the proportion of coal in my country's primary energy will still account for about 50%. Among the proven lignite reserves in China, the northeastern region of Inner Mongolia is the largest, accounting for about 3 / 4 of the country's lignite reserves; the southwestern region, dominated by Yunnan Province, accounts for about 1 / 5 of the country's lignite reserves. Lignite is the coal with the lowest degree of coalification. Its main characteristics are that the moisture content is as high as 30%~50%, the oxygen content is as high as 15%~30%, the high volatil...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a lignite vibrating hot-press dehydration and upgrading process and system, that is, lignite is molded while lignite is upgrade...

Images