Large spiral low-order lignite quality improving system

Abstract

A large spiral low-order lignite quality improving system comprises a spiral heat exchanger, a combustion chamber, a lignite feeding device, a quenching box and a dedusting device. The spiral heat exchanger is horizontally placed and composed of an outer sleeve, a rotating shaft and a motor, wherein the rotating shaft and the motor are sleeved in the outer sleeve, and the rotating shaft is in transmission connection with the motor. A spiral blade is axially arranged along the rotating shaft, the wall of the outer sleeve, the rotating shaft and the spiral blade are all of hollow structures, tow ends of the spiral blade are communicated with a hollow cavity of the rotating shaft, the inlet end of a hollow cavity of the wall of the outer sleeve and the inlet end of the hollow cavity of the rotating shaft are communicated with the combustion chamber, and the outlet end of the hollow cavity of the wall of the outer sleeve and the outlet end of the hollow cavity of the rotating shaft are communicated with the dedusting device. The lignite feeding device is arranged on the upper portion of the spiral heat exchanger and close to the side of the dedusting device, and the quenching box is arranged on the lower portion of the spiral heat exchanger and close to the side of the combustion chamber. The large spiral low-order lignite quality improving system requires no pre-drying process, is strong in adaptability of coal types and particularly suitable for improving quality of sticky lignite, only needs to pre-break raw coal, is safe in operation, simple in structure and high in heat exchange efficiency, can perform large-scale continuous production easily and can obtain semi-coke, tar and coal gas with high quality.

Description

technical field [0001] The invention relates to a dry distillation system, in particular to a large-scale spiral low-order lignite upgrading system for upgrading the low-order lignite with high water content and strong cohesiveness. Background technique [0002] In recent years, with the rapid development of the world economy and the continuous consumption of natural resources, there has been a serious shortage of high-quality coal resources, and low-rank lignite has gradually been valued and utilized. Lignite has low degree of coalification, high moisture content, high volatile content, easy weathering and fragmentation in the air, low calorific value, and easy bonding after heating. Therefore, it is necessary to find a reasonable and economical way to utilize this coal type to alleviate The current situation of shortage of coal resources. [0003] The process of thermally decomposing coal to generate gas, tar, crude benzene and coke under the condition of isolation of air...

AI Technical Summary

Problems solved by technology

Since the lumpy coal of low-rank lignite will be broken after heating, the coal material should be compacted in advance when using the internal heat method, and the particle size range is narrow, which increases the cost and is not suitable for caking coal.

Moreover, in the internal heating type carbonization furnace using flue gas as the heat carrier, the coal seam is heated by flue gas, the low-rank coal is prone to oxidation, the corrosion of equipment is also relatively serious, and the overheating problem caused by local oxidation heat release is prone to occur, which is easy to cause Volatile matter burns or even explodes, which affects the normal and stable operation of the system; in general externally heated carbonization furnaces, due to uneven heating of coal materials, the quality of semi-coke is uneven, and the output is also low

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