厚煤层智能放煤工艺及精准控制关键技术研究

基于智能放煤工艺原理和智能放煤工艺流程分析,指出智能放煤工艺的关键是煤矸识别,并阐述了基于振动信号检测、音视频检测、灰分在线检测的智能放煤工艺原理。介绍了通过在支架前部安装UWB透地雷达测量顶煤厚度作为放煤量的基准,采用基于振动加速度传感器的煤矸识别方式进行煤矸识别,以9.5～10.5kHz范围作为矸石放落有效信号为终止放煤基准,通过在综放支架尾梁和插板油缸安装磁致伸缩行程传感器实现对放煤机构动作精准控制。在王家岭煤矿12309工作面综放开采的现场应用证明：采用该智能放煤工艺顶煤采出率达到91%,煤炭含矸率达到20%,与人工放煤“见矸关窗”方式相比分别提高3%、降低3%。总体采放效率提升约20%。

Research on intelligent top-caving technology of thick coal seam and key technologies of precise control of top-caving coal

In the process of fully mechanized caving, it is an important direction to improve the recovery rate of top coal and reduce the gangue rate of coal. In this paper, the principle and process of intelligent coal discharging process are systematically analyzed. It is pointed out that the key of intelligent top-coal caving process is coal and gangue recognition. This paper describes the principle of intelligent top-coal caving technology based on vibration signal detection, audio and video detection and ash online detection. This paper describes three key technologies for precise control of intelligent top-coal caving. By installed in the front bracket UWB through penetrating radar measurement top-coal thickness as the benchmark of coal quantity, the coal gangue identification based on vibration acceleration sensor is used to identify the coal gangue, with 9.5 KHz to 10.5 KHz range to be an effective signal for the termination of the coal gangue down benchmark, insert by tail beam in sublevel caving support and suet cylinder installation magnetostrictive stroke sensor precision control of coal body movements. According to the practice of fully mechanized caving in the 12309 working face of Wangjialing coal mine, the extraction rate of top coal reached 91% and the coal gangue content rate reached 8% by using the intelligent coal drawing process, which increased by 3% and decreased by 2% respectively compared with the manual coal drawing method of "see gangue close the window". Overall recovery and release efficiency increased by about 20%.The study can provide reference for intelligent top-caving in fully mechanized caving face of thick coal seam.