Intelligent dry method gangue discharge system and method applied to underground coal mine

Abstract

The invention provides an intelligent dry method gangue discharge system and method applied to an underground coal mine. The intelligent dry method gangue discharge system and method are suitable for preferential separation of underground coal gangue, on-line identification of coal and the coal gangue and sorting based on different densities of the coal and the coal gangue through the synergistic effect of an X-ray and lattice detector and an ultrasonic ranging device. The intelligent dry method gangue discharge system and method are simple in process, high in intelligent level, good in separation effect and small in investment. With the adoption of the intelligent dry method gangue discharge system and method, the gangue can be discharged underground directly on the spot and does not need to be conveyed to the ground. Kinetic energy consumption and transport cost are reduced, due to the fact that the gangue is not lifted out of a well, ineffective transport can be canceled, transport expense is reduced, and transport cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of coal preparation, and relates to an intelligent dry gangue discharge system and method applied to underground coal mines, which is suitable for the preferential separation of underground coal gangue and the use of X-rays and lattices based on the different densities of coal and coal gangue. The detector and the ultrasonic ranging device cooperate to identify and sort coal and gangue online. Background technique [0002] Coal gangue is an accompanying substance in the process of coal production and processing. It has low calorific value and many harmful materials, which seriously affects product quality. It needs to be identified and sorted in time. In conventional underground coal mining, gangue and coal are transported to the ground for sorting, which wastes a lot of manpower and material resources for transportation and lifting. After sorting, gangue piles up into mountains, occupies land, and pollutes ...

AI Technical Summary

Problems solved by technology

Especially in recent years, with the continuous improvement of the degree of coal mining mechanization, a large number of faults or gangue in the underground working face are mixed into the raw coal, especially the wide application of top-coal mining technology, which makes the ash content of the raw coal unstable, the quality of the raw coal declines, and the market sales are difficult. , which affects the economic benefits of the enterprise; at the same time, in order to control the ash content of the raw coal, the mine often abandons mining when it encounters a fault, resulting in a low recovery rate of the working face, which not only wastes resources, but also shortens the service life of the mine

[0003] In the prior art, due to the limited underground conditions of coal mines, a very limited sorting of gangue is generally used. For example, there are currently underground gangue discharge systems for dense medium shallow groove sorters, underground gangue discharge systems for moving screen jig machines, etc., which basically means Preliminary sorting (coarse sorting) of gangue cannot be effectively separated from gangue; the coal separated by this equipment will also be mixed with a large amount of gangue, and secondary separation or sorting must be carried out on the well, resulting in repeated waste of resources

In addition, due to the complex process of the dense-medium shallow groove waste discharge system, the large number of supporting equipment for the moving screen jig discharge system, the large volume and large power consumption, etc., are limited in use, so the existing technology is used for sorting in coal mines. The technology generally cannot be transplanted to the downhole use

At present, the underground gangue sorting technology mentioned in various patent applications is only at the theoretical stage, and cannot be applied on a large scale in field practice

[0004] In addition, even in the existing coal gangue separation technology, coal and gangue with small particle size can be removed by medium coal washing or wind coal preparation. For massive coal and gangue, the existing The identification methods of technology mainly include manual sorting, image recognition methods, gamma ray identification and X-ray identification. These identification methods have their own advantages and production scope, but they all have certain defects or shortcomings.

For example, in manual sorting, the common problems are high labor intensity, harsh working environment, and low efficiency; the image recognition method is based on the color grayscale of coal and coal gangue, and the existing problem is that it is difficult to identify black coal gangue similar to coal; The linear array detectors commonly used now have many pixels and a large amount of data processing, which needs to be equipped with an industrial computer for special processing. In addition, it cannot solve the influence of material particle size and is not suitable for the specific use environment of coal mines.

Images