Process and system for sorting coal by discharging coal gangue through dry method

Abstract

The invention relates to a process and a system for sorting coal by discharging coal gangue through a dry method, which are suitable for sorting the coal for quality improvement in water shortage places. The coal sorting process comprises a particle size classification step and a plus sieve raw coal sorting step. In the process, a particle size range which is suitable for markets is obtained by particle size classification, the obtained raw coal is sorted by a sensor, and coal briquettes with more impurities are blown into an impurity chamber through high-speed compressed air, so that the sorting accuracy and efficiency are improved. The coal sorting system comprises a dry screening machine, a plus sieve raw coal conveying chute, a sensor system, a control system, a spray nozzle and a flow split chamber, wherein the tail end of the dry screening machine is connected with the feeding end of the plus sieve raw coal conveying chute; the sensor system and the discharging end of the plus sieve raw coal conveying chute are arranged corresponding to each other; the flow split chamber is arranged below the plus sieve raw coal conveying chute; and the spray nozzle controlled by the controlsystem is arranged between the discharging end of the plus sieve raw coal conveying chute and the flow split chamber. The system has a compact structure and a small floor area.

Description

technical field [0001] The invention relates to a process and a system for dry-method discharge of coal gangue and coal preparation, which are suitable for separating and improving the quality of coal in water-deficient places. Background technique [0002] Because raw coal contains some non-coal substances, among them, gangue, sulfur-containing salt and other substances with high ash content will lead to low calorific value of coal, so to increase the calorific value of coal, it is necessary to select these low calorific value from coal Impurities. At present, the coal preparation methods used by coal mining enterprises to increase the calorific value of coal can be roughly divided into: dry selection and wet selection. [0003] Wet separation: mix the raw coal with the medium density liquid with magnetic powder and then separate it according to the difference between the density of coal and the density of gangue. The process of wet separation is complicated, there are man...

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Problems solved by technology

Dry coal separation has the advantages of less investment, simple process, and low operating cost, but the traditional dry separation process uses hand-selected gangue, which has low production efficiency, and because there are large human factors in manual coal selection, the separation cannot be guaranteed. Accuracy and effect; in order to improve the separation accuracy, most of the wind cyclone is used to sort according to the density, but the coal preparation process of the wind cyclone needs to blow up all the raw coal containing gangue by wind, but this method consumes energy High, noisy and dusty, does not meet environmental protection requirements

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