PROCESS AND SYSTEM FOR DRY COAL SEPARATION BY COAL GANGUE REMOVAL

摘要

The process for coal separation includes two steps of size grading and oversize raw coal separating. A size range is obtained through size grading, then the obtained raw coal is separated by a sensor system, and coal briquettes with high impurity contents are blown into an impurity chamber through high-speed compressed air, thus improving the separating accuracy and efficiency. The system for coal separation includes a dry screening machine, an oversize raw coal conveying chute, a sensor system, a control system, nozzles and a flow division chamber. The tail end of the dry screening machine is connected with the charge end of the chute; the sensor system and the discharge end of the chute are correspondingly arranged; the flow division chamber is arranged below the chute; and the nozzles operated and controlled by the control system are arranged between the discharge end of the chute and the flow division chamber.

主权项

1. A process for dry coal separation by coal gangue removal, comprising the following steps:
(1) size grading: the needed size range of raw coal is determined as needed, raw materials are screened by a dry screening machine, the raw coal is divided into oversize raw coal and undersize raw coal after the size grading, the undersize raw coal is conveyed to other places through an undersize raw coal conveying device, and the oversize raw coal is the raw coal in the needed size range, and enters an identification area composed of a sensor system, a control system, nozzles and a flow division chamber through an oversize raw coal conveying chute; (2) oversize raw coal separating: after the oversize raw coal enters the identification area, radiography and ingredient judgment are performed on the composition of the oversize raw coal by the sensor system, the perspective images and characteristics of coal briquettes will be presented due to the difference between the densities of the coal briquettes and the contents of impurities such as gangue, sulphur, iron and the like, the information is transmitted to the control system by the sensor system, the positions of the coal briquettes with high impurity contents are identified and the opening and closing of the nozzles at corresponding positions are controlled by the control system, high-speed compressed air is horizontally blown to the positions with the high impurity contents through the nozzles, the coal briquettes with the high impurity contents are blown into an impurity chamber of the flow division chamber, and needed products fall into a product chamber of the flow division chamber, so as to finish the oversize raw coal separating.