Low-rank coal vibration separation drying device and method

Abstract

The invention discloses a low-rank coal vibration separation drying device and method, and belongs to the technical field of drying devices. The device comprises a rack, a box, a feeding opening, hot smoke inlets, an air flow disperser, a vibration exciter, a motor, a connecting shaft, a large-sieve-pore sieve plate, a medium-sieve-pore sieve plate, a small-sieve-pore sieve plate, a suspension spring, discharging openings, gas and dust removing negative-pressure devices and gas-solid separators. After entering the box from the feeding opening, raw coal drops on a sieve surface, wherein the sieve surface is arranged at a dip angle of 5-15 degrees, the aperture of the sieve surface is progressively increased from the feeding opening to the discharging openings, the raw coal is vibrated under the effect of the vibration exciter, and the raw coal on the sieve surface is mixed and is classified. Meanwhile, after passing through the air flow disperser, hot smoke enters the box and dries raw coal with different particle sizes, after being sieved, the completely dried raw coal enters the discharging openings, after passing through the gas and dust removing negative-pressure devices, gas and dust enter the gas-solid separators, therefore, classified drying of particles with different granularities is realized, and problems that coarse particles are dried insufficiently and fine particles are over-dried are avoided.

Description

technical field [0001] The invention relates to a low-rank coal drying equipment method, in particular to a low-rank coal vibration classification drying equipment and method suitable for improving the combustion of low-rank coal in a boiler. Background technique [0002] Low-rank coal is cheap, but the water content is usually between 30% and 60%. When low-rank coal with high water content is burned in the boiler, 20% to 25% of the combustion heat is used to evaporate the moisture in the coal, resulting in low thermal efficiency of the boiler. In addition, coal with high water content will freeze due to low temperature during transportation. Therefore, in order to improve the utilization efficiency of low-rank coal and expand its application, various research institutions have devoted themselves to the research of low-rank coal drying equipment. Conventional drying equipment directly mixes low-rank coal with different particle sizes and drying gas at a certain temperature ...

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Problems solved by technology

[0003] Technical problem: The purpose of this invention is to overcome the deficiencies in the prior art, to provide a low-rank coal vibration generator with simple structure, convenient operation, improved boiler thermal efficiency, low drying rate of low-rank coal, and uneven heating of samples. Grading drying equipment

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