Research progress and prospect of key technology of intelligent gas drainage in coal mine

In order to promote the development of intelligent gas drainage technology and improve coal mine safety assurance capabilities, five characteristics of intelligent gas extraction were described: precise perception, self-decision making, self-execution, self-adaptation and self-learning, from the perspective of less or no people in the whole process of gas drainage. An intelligent gas drainage system structure including two dimensions of function and technology were proposed. The functional dimension covers all aspects of gas drainage; and the technical dimension includes three levels: stand-alone intelligence, unit intelligence and integrated intelligence, which reflects the iterative process of the intelligent gas drainage technology. The overall architecture of intelligent gas drainage was designed, which consists of four levels: perception control layer, transmission layer, data layer, application layer and two systems including information standard and information security. Finally, the key supporting technologies for intelligent gas drainage were discussed from five aspects: dynamic and transparent gas geology, intelligent design of drainage borehole, drilling-penetration-sealing robots, intelligent control and diagnosis of gas drainage systems, and automatic dynamic evaluation of drainage standard.The development trend of key technologies towards precision, efficiency and intelligence was analyzed.Solution strategies such as differentiated intelligent design of drainage boreholes and multi-layer progressive dynamic evaluation of drainage reaching standards were provided.Typical application cases such as the centralized control and coordinated operation of the "three-person and five-unit" automatic drilling rig in Xieqiao Coal Mine, the automatic control of the extraction pipe network of Huoerxinghe Coal Mine, and the online evaluation of the drainage standard of Xinyuan Coal Mine were given. It provides a useful reference for the research of intelligent gas drainage technology and the practice of system construction.