An experimental system and method for vibrating classification, drying and quality improvement of low-rank coal

Abstract

An experimental system and method for vibration grading, drying and quality improving of low-rank coal belong to drying and quality improving systems and methods of the low-rank coal. The system is formed by a vibration grading barrel, a grading barrel support, a multi-screening-face mechanism, a grading barrel exciter, a hot smoke input pipeline at the upper portion of a barrel body, a discharging port in the lower portion of the barrel body and a hot smoke replenishing pipeline outside the barrel body, wherein the multi-screening-face mechanism is arranged inside the barrel body. Raw low-rank coal is added into vibration grading drying barrels from the upper portion, pre-grading is carried out by the grading drying barrels under the effect of the exciter, the calibers of screening faces are reduced from top to bottom, the pre-graded low-rank coal forms material layers on the screening faces with different calibers, high temperature hot smoke enters the drying barrels from the upper portion of the barrel body and is in contact with particles of the largest fraction, a coal sample in a vibrating screen is dried, and a screening barrel continuously vibrates to keep the materials loose. The temperature is reduced after the hot smoke passes through the screening face, the hot smoke enters the lower layer of the screening barrel to dry the particles of the next fraction and so on. Finally, the particles of the smallest fraction are discharged into a tail gas separating device along with cooled smoke tail gas.

Description

technical field [0001] The invention relates to a low-rank coal drying and upgrading system and method, in particular to a low-rank coal vibration classification drying and upgrading experimental system and method. Background technique [0002] Low-rank coal has a low degree of coalification, rich oxygen-containing functional groups, well-developed pores, and high water content. High water content leads to low calorific value of raw coal, energy consumption due to water evaporation during combustion, and low power generation efficiency. At the same time, the high water content of low-rank coal has adverse effects on its application in coal chemical industry such as liquefaction and gasification. In conventional drying applications, due to the wide particle size of low-rank coal raw coal, the drying gas at the same temperature is in contact with coal samples of different particle sizes. The heat transfer path is short and the temperature rises too fast. As a result, the lar...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a low-rank coal vibration graded drying and upgrading experimental system and method with simple structure, safe and convenient operation, and high drying efficiency, so as to solve the problems of high energy consumption, low dehydration efficiency, and uneven heating of samples in traditional drying methods.

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