Pulverized coal dryer

Abstract

The invention relates to a pulverized coal dryer. The pulverized coal dryer comprises a negative-pressure empty cavity and a drying empty cavity, wherein the negative-pressure empty cavity is arranged on the upper part of the drying empty cavity and is communicated with the drying empty cavity; the negative-pressure empty cavity comprises a piston component comprising a piston cylinder body the bottom of which is communicated with the drying empty cavity; the piston cylinder body is internally connected with a piston in a sliding mode; the side wall of the bottom of the piston cylinder body is provided with a unidirectional valve A; the drying empty cavity is internally provided with a pulverized coal grinding component; the top of the drying empty cavity is provided with a charge hopper; the bottom of the drying empty cavity is provided with a discharge hopper; the charge hopper is connected with a seal valve A; the discharge hopper is connected with a seal valve B; a plurality of discharge holes are densely distributed in a grinding plate; the drying empty cavity and the piston cylinder body are communicated via a unidirectional valve B. Water drops in the pulverized coal and other mixed gases are separated via a negative-pressure type evacuation structure, and are discharged out after separation, and the time consumption is short in the whole drying process.

Description

technical field [0001] The invention relates to a pulverized coal dryer, which belongs to the field of fluidized boiler auxiliary equipment. Background technique [0002] The automatic sample preparation of coal is the current development direction. [0003] The general coal sample is crushed, mixed, shrunk, dried, pulverized and other processes, and finally made into a general analysis test coal sample with a particle size of less than 0.2mm. The sample preparation process is divided into several stages: making 13mm sample - making 6mm sample - making 3mm sample - making 0.2mm sample. The entire sample preparation process is unmanned and completed automatically, that is, automatic sample preparation. [0004] Coal sample pulverization refers to the sample preparation process from 3mm sample to 0.2mm sample. The 0.2mm sample is in powder form, with strong adhesion, and is easily adsorbed on the surface of the powder making machine. Powder samples with high water content ...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: to overcome the technical problem of relatively low online drying efficiency of pulverized coal in the prior art, and to provide an improved pulverized coal dryer

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