Coal grinding system and method for safely and efficiently preparing lignite

Abstract

The invention discloses a coal grinding system and method for safely and efficiently preparing lignite. The coal grinding system comprises a raw coal feeding system, a hot blast stove system, a pneumatic conveying system, a finished product conveying system, a coal grinding machine system and a safety system, wherein the raw coal feeding system conveys the lignite to be ground to the coal grindingmachine system, and the pneumatic conveying system conveys qualified lignite powder to the finished product conveying system. Compared with the prior art, the coal grinding system and method for safely and efficiently preparing the lignite have the advantages that the preparation capability is high, the system drying capacity is large, the consumption of the hot blast stove is low, the safety guarantee is high, and the coal grinding system and method are suitable for preparing the coal powder of the lignite.

Description

technical field [0001] The invention relates to the technical field of a coal grinding system and a method thereof, in particular to a coal grinding system and a method for preparing lignite safely and efficiently. Background technique [0002] Worldwide lignite accounts for about 40% of the total coal reserves, and my country's lignite resources account for 13% of the total coal reserves. Lignite is the lowest coalification mineral product. The two most important features of lignite are high water content, high volatile components, large porosity, and humic acid content. The water in lignite can be divided into free water, surface water, molecular water and pore water according to the form. For lignite, moisture is the most important factor affecting its efficient utilization. [0003] Many small thermal power plants mainly use chain furnaces and pulverized coal boilers. The chain furnace belongs to the layer combustion method, and the pulverized coal boiler belongs to ...

AI Technical Summary

Problems solved by technology

[0006] The disadvantages of the original technology are: (1) The capacity of the preparation system is small, and the qualified coal powder goes directly into the bag collector from the coal mill

Limited by the capacity of the bag collector, the capacity of the preparation system is not high

(2) The heat loss of the preparation system is large, the outlet of the bag collector is directly led to the chimney, and a large amount of heat is directly discharged from the chimney into the atmosphere

(3) The safety is low. Because a large amount of hot air is discharged from the chimney, a large amount of air needs to be supplemented in the system, and the oxygen content in the system is high, which has the risk of explosion

(4) The drying output of the preparation system is low, and the oxygen content in the preparation system is high, so the outlet temperature of the control coal mill is low, and the drying capacity in the coal mill is limited

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