High-moisture brown coal pulverizing and drying apparatus and method thereof

Abstract

The invention provides a high-moisture brown coal pulverizing and drying apparatus and a method thereof. The brown coal pulverizing and drying apparatus is characterized in that the apparatus comprises a fluidized bed dryer, the fluidized bed dryer is connected with a deduster, the deduster is connected with the inlet of a mixer, the deduster is connected with a low pressure steam heater, a fluidization fan and a booster fan, the fluidization fan is connected with the fluidized bed dryer, the booster fan is connected with the steam coil tube of the fluidized bed dryer, the fluidized bed dryer is connected with the inlet of the mixer, the mixer is connected with a coal pulverizer, the coal pulverizer is connected with a pulverized coal filter, the pulverized coal outlet of the pulverized coal filter is connected with a pulverized coal cabin, the gas outlet of the pulverized coal filter is connected with a circulating fan, the circulating fan is connected with a divider, the divider is connected with the low pressure steam heater, the low pressure steam heater is connected with an inert gas generator, and the inert gas generator is connected with the coal pulverizer. The apparatus and the method are suitable for the drying and the pulverizing of coals comprising high-moisture brown coal and the like, and the particle size distribution and the water content of the prepared pulverized coal are adapted to requirements of a vaporizing furnace.

Description

technical field [0001] The invention relates to a lignite coal grinding and drying device and method for an entrained bed pulverized coal gasification system, in particular to a lignite coal grinding and drying device and method for lignite gasification, which grinds high-moisture lignite into qualified particle size and moisture Coal powder, raw material for pulverized coal gasification. Background technique [0002] Lignite is a coal resource whose coalification degree is only higher than that of peat. According to incomplete statistics, the world's lignite reserves are about 1 trillion tons, while China's lignite reserves reach 211.8 billion tons, mainly concentrated in eastern Inner Mongolia, Heilongjiang and Yunnan-Guizhou Plateau. The development of lignite efficient utilization technology and the expansion of lignite development and utilization space are one of the projects encouraged by my country's energy-saving technology policy. [0003] Coal entrained bed gasi...

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Problems solved by technology

[0005] Invention patent CN 101015814 discloses a coal grinding and drying method, which solves the inertization problem that is difficult to solve in the coal powder preparation system in the existing processing method of grinding raw coal into coal powder

But this patent cannot adapt to the grinding and drying of lignite with high moisture content

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